FN Thomson Reuters Web of Science™ VR 1.0 PT J AU LARSEN, JT MORGAN, WL GOLDSTEIN, WH AF LARSEN, JT MORGAN, WL GOLDSTEIN, WH TI ARTIFICIAL NEURAL NETWORKS FOR PLASMA X-RAY SPECTROSCOPIC ANALYSIS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Modem diagnostic instrumentation produces a vast amount of data that often requires substantial analysis efforts. New methods are needed to improve the efficiency of the analysis process. Artificial neural networks have been applied to a variety of signal processing and image recognition problems. The feed-forward, back-propagation technique is well suited for the analysis of scientific laboratory data, which is viewed as a pattern-matching problem. We summarize the concepts and algorithms as implemented on a personal computer, and illustrate the method using a nonlocal thermodynamic equilibrium theoretical atomic physics model for k-shell x-ray spectroscopy of a high density, high temperature aluminum plasma. Extensions to other types of spectroscopy data analysis are discussed. C1 KINEMA RES,MONUMENT,CO 80132. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LARSEN, JT (reprint author), CASCADE APPL SCI INC,POB 4477,BOULDER,CO 80306, USA. NR 6 TC 6 Z9 6 U1 2 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 4775 EP 4777 DI 10.1063/1.1143558 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300075 ER PT J AU DERZON, DK AUBERT, JH SCHNEIDER, DA ASSINK, RA SAWYER, PS MCNAMARA, WF AF DERZON, DK AUBERT, JH SCHNEIDER, DA ASSINK, RA SAWYER, PS MCNAMARA, WF TI PROTON-BEAM TARGETS SHOT ON PBFA-II SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB In recent proton beam experiments on PBFA-II, foam-filled gold targets and gas-filled spherical exploding pushers were shot as physics targets. Surrounding these targets were gold foils used to characterize the beam. The target fabrication and characterization are presented in this paper. C1 K TECH CORP,ALBUQUERQUE,NM 87110. L&M TECHNOL,ALBUQUERQUE,NM 87109. RP DERZON, DK (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 8 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4779 EP 4781 DI 10.1063/1.1143560 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300076 ER PT J AU FILUK, AB BAILEY, JE AF FILUK, AB BAILEY, JE TI ANALYZING NOISY SPECTRAL-LINE SHAPES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID ION AB In many situations it is necessary to analyze spectral line shapes where the data contain significant amounts of noise or statistical fluctuations. Our visible spectroscopy measurements exploring ion diode physics on the PBFA Il accelerator typically result in noisy spectra because the harsh environment limits the number of photons collected. The spectral line profiles include contributions from Doppler (T(i) approximately 1-3 keV), Stark (n(e) approximately 10(17) cm-3), and instrument broadening, as well as from Stark shifting (E approximately 3-10 MV/cm) and Zeeman splitting (B approximately 2-10 T). We extract a range of parameters (e.g., ion temperature from Doppler broadening) that fit the data by determining a range of fits that are consistent with the uncertainty due to the noise in the data. The range of fits is generated by a Monte Carlo technique. This method effectively distinguishes between actual spectral features and artifacts due to noise. It provides not only estimates of physical parameters, but also their uncertainties. We evaluated the technique over a range of signal-to-noise ratios and found that it works well for our application. RP FILUK, AB (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4783 EP 4785 DI 10.1063/1.1143562 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300077 ER PT J AU FEHL, DL LEEPER, RJ KENSEK, RP AF FEHL, DL LEEPER, RJ KENSEK, RP TI A SIMPLE UNFOLD METHOD FOR RUTHERFORD SCATTERING, INTENSE ION-BEAM SPECTROGRAPHS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Elastic Rutherford scattering with subsequent momentum analysis has become a powerful tool for analyzing intense, pulsed light-ion beams for inertial confinement fusion studies. The ion spectrum is obtained by mathematical inversion of the data. This paper reports a product-integration solution to the inverse problem which is readily adapted to rapid data analysis and is simpler in form than reported previously. While this approach introduces some unphysical (negative) components into the solution, these are often negligible. Discussed here are the unfold method together with its accuracy and precision. RP FEHL, DL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4786 EP 4788 DI 10.1063/1.1143563 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300078 ER PT J AU FEHL, DL BALDWIN, GT LORENCE, LJ AF FEHL, DL BALDWIN, GT LORENCE, LJ TI CAUTIONS IN USING X-RAY MEASUREMENTS DERIVED FROM BROAD SPECTRAL RESPONSE FUNCTIONS TO DETERMINE THE PEAK VOLTAGE OF FLASH BREMSSTRAHLUNG SOURCES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SPECTROMETER AB Because a direct measurement of the voltage ( V) in pulsed power bremsstrahlung sources can be difficult, the energy spectrum of x rays emitted is sometimes used to infer V. Both the voltage and current in such sources vary with time. Moreover, for modern x-ray simulators with multiple cathodes, multiple voltages may exist simultaneously. We demonstrate here how such sources lead to systematic errors in several types of simple-to-field x-ray voltage measurements, especially those with broad spectral response functions, when calibrated against constant-potential bremsstrahlung spectra. RP FEHL, DL (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4789 EP 4791 DI 10.1063/1.1143564 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300079 ER PT J AU SANFORD, TWL HALBLEIB, JA LORENCE, LJ KELLY, JG GRIFFIN, PJ POUKEY, JW MOCK, RC MCATEE, WH MIKKELSON, KA AF SANFORD, TWL HALBLEIB, JA LORENCE, LJ KELLY, JG GRIFFIN, PJ POUKEY, JW MOCK, RC MCATEE, WH MIKKELSON, KA TI VOLTAGE MONITORS FOR HIGH-POWER 10-20 MV PULSED ELECTRON-ACCELERATORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID DIODES AB Four monitoring techniques that can determine peak voltage (V(p)) to a precision of approximately 5% for high-intensity, pulsed electron accelerators operating in the 10 to 20 MV range are discussed and applied to the 14-TW HERMES III accelerator. The techniques utilize parapotential flow theory, the range of H- ions, the bremsstrahlung from electron interactions with an electron target, and the photoneutron fluence from neutrons generated in a bremsstrahlung target. Application of these techniques to HERMES III shows that when the accelerator is operating under nominal conditions, V(p) = (18.7 +/- 0.7) MV. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 7 Z9 7 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4795 EP 4798 DI 10.1063/1.1143566 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300081 ER PT J AU FONCK, RJ COSBY, G DURST, R GIBNEY, T THOMPSON, M PAUL, SF AF FONCK, RJ COSBY, G DURST, R GIBNEY, T THOMPSON, M PAUL, SF TI REMOTE OPERATION OF THE TFTR BES EXPERIMENT FROM AN OFF-SITE LOCATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The capability of controlling a diagnostic subsystem and interactively participating in the experimental program on Tokamak Fusion Test Reactor (TFTR) from a remote site has been developed and demonstrated on the TFTR BES experiment. Interactive communications are established from multiscreen remote workstations at the University of Wisconsin to the Princeton Plasma Physics Laboratory VAX cluster via multiple terminal sessions across the InterNet national network. Full control of the diagnostic, access to all relevant machine parameters and wave forms, and operations run logs are all available with automatic updates between plasma shots. A real-time count-down shot clock with timer, machine event status, and shot number provides a real-time interface to the TFTR shot sequence. This means of remote participation in a central fusion experiment provides vital experience for extrapolation to implementation on an ignition device to test engineering concepts. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP FONCK, RJ (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN,MADISON,WI 53706, USA. NR 0 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4803 EP 4805 DI 10.1063/1.1143568 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300083 ER PT J AU NADLER, JH GU, YB MILEY, GH AF NADLER, JH GU, YB MILEY, GH TI POTENTIAL PROFILE MEASUREMENTS USING A COLLIMATED PROTON DETECTOR IN SPHERICAL INERTIAL-ELECTROSTATIC PLASMA-CONFINEMENT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A collimated proton detector has been developed for spatial resolved proton measurements in inertial-electrostatic plasma confinement (IEC) fusion experiments. These are the first proton measurements used to infer potential well profiles on an IEC device. This paper describes a new technique for investigating the existence of multiple potential wells inside IEC devices. Analysis of the observed proton energy and source profile indicates that (for a 12-mA cathode current, a 30-kV cathode voltage in a 4-mTorr D2 background) predominantly beam-background fusion occurs. Computer simulation suggests that a positive space charge potential approximately half that of the applied voltage is formed inside the cathode. These results establish the first measurement of a positive potential well structure inside an ion-injected IEC device. C1 UNIV ILLINOIS,FUS STUDIES LAB,URBANA,IL 61801. RP NADLER, JH (reprint author), US DOE,FIELD OFF,IDAHO FALLS,ID 83401, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4810 EP 4812 DI 10.1063/1.1143844 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300085 ER PT J AU BRADLEY, DK BELL, PM KILKENNY, JD HANKS, R LANDEN, O JAANIMAGI, PA MCKENTY, PW VERDON, CP AF BRADLEY, DK BELL, PM KILKENNY, JD HANKS, R LANDEN, O JAANIMAGI, PA MCKENTY, PW VERDON, CP TI HIGH-SPEED GATED X-RAY-IMAGING FOR ICF TARGET EXPERIMENTS (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID FRAMING CAMERA AB We describe the use of gated microchannel-plate detectors as high-speed framing cameras in laser-driven inertial-confinement-fusion experiments. Using an array of pinholes to image the target, detectors capable of generating up to 16 individual frames with approximately 90 ps resolution on a single laser shot are now in routine use. The detectors have been used to study the development of intentionally applied perturbations in laser-driven targets. In off-line tests new detectors have demonstrated time resolutions better than 40 s. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BRADLEY, DK (reprint author), UNIV ROCHESTER,LASER ENERGET LAB,ROCHESTER,NY 14623, USA. NR 18 TC 70 Z9 80 U1 1 U2 9 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 OCT PY 1992 VL 63 IS 10 BP 4813 EP 4817 DI 10.1063/1.1143571 PN 2 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300086 ER PT J AU CABLE, MD HATCHETT, SP NELSON, MB AF CABLE, MD HATCHETT, SP NELSON, MB TI NEUTRON SPECTROSCOPY WITH A LARGE NEUTRON TIME-OF-FLIGHT DETECTOR ARRAY (LANSA) (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID CONFINEMENT FUSION-TARGETS; SPECTRA; DENSITY AB The recent completion of the Large Neutron Scintillator Array (LaNSA) at the Nova Laser Fusion Facility has allowed low yield neutron energy spectra to be measured for ICF implosions. These spectra can be used to determine some fundamental implosion characteristics such as fuel areal density and ion temperature. Details of how neutron energy spectra are measured with an array of single particle detectors will be presented, as well as experimental data showing the application of these spectra to the determination of implosion parameters. Particular emphasis will be placed on measurements of secondary DT neutrons produced from initially pure deuterium fuel. Determination of the interacting triton energy spectrum from secondary neutron energy spectroscopy and its application to studies of fuel-pusher mixing will also be discussed. RP CABLE, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 8 TC 24 Z9 25 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4823 EP 4827 DI 10.1063/1.1143573 PN 2 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300088 ER PT J AU CHANDLER, GA AUBERT, J BAILEY, J CARLSON, A DERZON, D DERZON, M DUKART, R HUMPHREYS, R HUNTER, J JOHNSON, DJ MATZEN, MK MOATS, A OLSON, R PANTUSO, J ROCKETT, P RUIZ, C SAWYER, P TORRES, J HUSSEY, T AF CHANDLER, GA AUBERT, J BAILEY, J CARLSON, A DERZON, D DERZON, M DUKART, R HUMPHREYS, R HUNTER, J JOHNSON, DJ MATZEN, MK MOATS, A OLSON, R PANTUSO, J ROCKETT, P RUIZ, C SAWYER, P TORRES, J HUSSEY, T TI ICF TARGET DIAGNOSTICS ON PBFA-II (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID INTENSE ION-BEAM; PLASMAS; FUSION AB Particle Beam Fusion Accelerator II is a light-ion fusion accelerator that is presently capable of irradiating a 6-mm-diam sphere with approximately 50 kJ of 5.5-MeV protons in approximately 15 ns. An array of particle and x-ray diagnostics fielded on proton Inertial Confinement Fusion target experiments quantifies the incident particle beam and the subsequent target response. An overview of the ion and target diagnostic setup and capabilities will be given in the context of recent proton beam experiments aimed at studying soft x-ray emission from foam-filled targets and the hydrodynamic response of exploding-pusher targets. Ion beam diagnostics indicate approximately 100 kJ of proton beam energy incident within a 1.2-cm radius of the center of the diode with an azimuthal uniformity which varied between 6% and 29%. Foam-filled target temperatures of 35 eV and closure velocities of 4 cm/mus were measured. C1 PHILLIPS LAB,WSEP,KIRTLAND AFB,NM 87117. RP CHANDLER, GA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 27 TC 23 Z9 23 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4828 EP 4833 DI 10.1063/1.1143574 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300089 ER PT J AU WENZEL, KW LO, DH PETRASSO, RD COLEMAN, JW LI, CK LIERZER, JR BORRAS, C WEI, T HSIEH, E BERNAT, T AF WENZEL, KW LO, DH PETRASSO, RD COLEMAN, JW LI, CK LIERZER, JR BORRAS, C WEI, T HSIEH, E BERNAT, T TI A FUSION-PRODUCT SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A Texas Nuclear Cockcroft-Walton neutron generator was refurbished for use as a general fusion-product source, This well-calibrated source is now used routinely for characterizing energetic charged-particle detectors, for the development of nuclear fusion diagnostics, for studying radiation damage, and for calibrating x-ray detectors for laboratory and space plasmas. This paper is an overview of the facility. We describe the main accelerator operating systems, the primary fusion reactions studied, and several diagnostics used to characterize the fusion-product source. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WENZEL, KW (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 6 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4837 EP 4839 DI 10.1063/1.1143576 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300091 ER PT J AU WENZEL, KW PETRASSO, RD LO, DH LI, CK COLEMAN, JW LIERZER, JR HSIEH, E BERNAT, T AF WENZEL, KW PETRASSO, RD LO, DH LI, CK COLEMAN, JW LIERZER, JR HSIEH, E BERNAT, T TI MIT FUSION GAMMA-RAY DIAGNOSTIC DEVELOPMENT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID ENERGIES; SPECTRA AB In conjunction with gamma-ray diagnostic development for the NOVA Upgrade and Alcator C-MOD experiMents, we have assembled a comprehensive set of absolutely calibrated gamma-ray sources and several gamma-ray detectors. These tools will be used in characterizing and calibrating new gamma-ray diagnostic systems as they are assembled. The gamma-ray sources comprise both radioisotopes and nuclear reactions. The latter are generated in the MIT Cockcroft-Walton fusion-product generator. The detectors include several "standard" NaI(T1) scintillators and a high-resolution germanium detector. This paper briefly discusses the diagnostics planned for NOVA Upgrade and Alcator C-MOD. In addition it describes the gamma-ray sources and detector characterizations we have performed in the laboratory. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WENZEL, KW (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4840 EP 4842 DI 10.1063/1.1143577 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300092 ER PT J AU LI, CK WENZEL, KW PETRASSO, HD LO, DH COLEMAN, JW LIERZER, JR HSIEH, E BERNAT, T AF LI, CK WENZEL, KW PETRASSO, HD LO, DH COLEMAN, JW LIERZER, JR HSIEH, E BERNAT, T TI PIXE X-RAYS - FROM Z=4 TO Z=92 SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID EMISSION AB A high-intensity, charged-particle-induced x-ray (PIXE) source has been developed for the purpose of characterizing x-ray detectors and optics, and measuring filter transmissions. With energetic proton beams up to 165 keV, intense line x radiations (0.5 angstrom less-than-or-equal-to lambda less-than-or-equal-to 111 angstrom) have been generated from the K, L, M, and N shells of elements 4 less-than-or-equal-to Z less-than-or-equal-to 92. The PIXE spectrum has orders-of-magnitude lower background continuum than a conventional electron beam or radioactive alpha-fluorescence source [C. K. Li, R. D. Petrasso, K. W. Wenzel et al (to be published)]. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LI, CK (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 7 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4843 EP 4845 DI 10.1063/1.1143578 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300093 ER PT J AU LIERZER, JR WENZEL, KW PETRASSO, RD LO, DH COLEMAN, JW LI, CK HSIEH, E BERNAT, T AF LIERZER, JR WENZEL, KW PETRASSO, RD LO, DH COLEMAN, JW LI, CK HSIEH, E BERNAT, T TI A PROTON ACTIVATION DIAGNOSTIC TO MEASURE D-HE-3 REACTION YIELDS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We are developing activation diagnostics for monitoring energetic charged-particle fluxes in space and laboratory plasmas. More immediately, we plan to use activation to measure the time-integrated proton flux from D-He-3 fusion reactions in Alcator C-MOD, providing a measure of the time-averaged D-He-3 fusion rate. We demonstrated the technique's feasibility by inducing significant gamma activity in a titanium sample exposed to D-He-3 protons created in our Cockcroft-Walton generator. The titanium target received a fluence of 5.5 X 10(9) protons at 14.7 MeV (of order what a 3-cm2 target should receive from one shot in Alcator C-MOD) and became activated by the (Ti(p,n)V)-Ti-48-V-48 reaction. The activity's spectrum from a high-purity germanium (HPGe) detector showed the characteristic 0.984- and 1.312-MeV lines of V-48. The measured activity agreed reasonably well with theory. An absence of activity at those energies before D-He-3 activation eliminated background or D-D product-induced activity as the gamma source. We intend to repeat the experiment with a chromium target to evaluate that material's diagnostic potential. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LIERZER, JR (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 10 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4847 EP 4849 DI 10.1063/1.1143580 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300094 ER PT J AU LO, DH PETRASSO, RD WENZEL, KW COLEMAN, JW LI, CK LIERZER, JR HSIEH, E BERNAT, T AF LO, DH PETRASSO, RD WENZEL, KW COLEMAN, JW LI, CK LIERZER, JR HSIEH, E BERNAT, T TI RESPONSE OF SBDS TO MEV PROTONS, TRITONS, AND ALPHAS - EVIDENCE THAT THE CHARGED-PARTICLE SENSITIVE DEPTH IS NOT GENERALLY THE DEPLETION DEPTH SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TOKAMAK AB As part of an on-going effort to develop diagnostics for energetic charged particles from laboratory and space experiments, we examined the possibility that particle identification could be expedited by varying the applied bias voltage on silicon surface barrier detectors (SBDs). Using MeV protons, tritons, and alphas, we performed spectroscopy experiments whereby we observed changes of the energy spectrum as a function of the bias voltage. These particles were either generated via a Cockcroft-Walton linac as fusion products, or emitted from radioisotopes. The results indicate that, contrary to commonly held belief, the detector sensitive depth is not generally the depletion depth. Indeed for partially depleted SBDs the performance is not greatly degraded even for zero bias. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LO, DH (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 12 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4850 EP 4852 DI 10.1063/1.1143581 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300095 ER PT J AU CECIL, FE LIU, H YAN, JS MEDLEY, SS AF CECIL, FE LIU, H YAN, JS MEDLEY, SS TI GAMMA-RAY TO CHARGED-PARTICLE BRANCHING RATIOS FOR THE RADIATIVE-CAPTURE OF DEUTERONS BY H-2, LI-6, AND B-10 SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID D-STATE ADMIXTURE; H-2(D,GAMMA)HE-4 REACTION; LOW-ENERGY; HE-4 AB The gamma to charged particle branching ratios for the radiative capture reactions of deuterons by H-2, Li-6, and B-10 have been measured between center of mass energies of 20 and 40 keV, 80 and 110 keV, and 150 and 170 keV, respectively. The branching ratios for these very high-energy gamma rays, having values of 23.8, 22.3, and 25.2 MeV for the targets 2H, 6Li, and 10B, respectively, constitutes the data base for the gamma ray diagnostics of the corresponding fusion plasmas. For the fusion gamma ray detector on TFTR, counting rates for these gamma rays as a function of the total fusion reaction rate will be presented. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP CECIL, FE (reprint author), COLORADO SCH MINES,GOLDEN,CO 80401, USA. NR 15 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4854 EP 4856 DI 10.1063/1.1143530 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300096 ER PT J AU MEDLEY, SS ROQUEMORE, AL CECIL, FE AF MEDLEY, SS ROQUEMORE, AL CECIL, FE TI ABSOLUTE CALIBRATION OF FUSION GAMMA-RAY DETECTOR ON TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB An in situ measurement of the absolute detection efficiency of the fusion ray detector on TFTR has been completed. The efficiency was determined by measuring the yield of the 4.44 MeV gamma ray from a plutonium-berrylium source situated within the vacuum vessel. The absolute detection efficiency at 4.44 MeV is extended to higher energies using the known energy dependence of the gamma ray attenuation coefficients in the vessel port cover, the detector neutron moderator, and the scintillator. The absolute detection efficiency (full energy peak detected gamma rays per source gamma ray) varies from 8.6E-9 at 4.44 MeV to 1.1E-8 at 17 MeV and is insensitive at the few percent level to relatively large variations in the radial profile of the gamma ray source distribution in the plasma. The absolute detection efficiency is used to determine the total d-He-3 reaction rate during recent deuterium neutral beam heated He-3 plasmas on TFTR. C1 COLORADO SCH MINES,GOLDEN,CO 80401. RP MEDLEY, SS (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4857 EP 4859 DI 10.1063/1.1143531 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300097 ER PT J AU STYGAR, WA MIX, LP LEEPER, RJ MAENCHEN, J WENGER, DF MATTSON, CR MURON, DJ AF STYGAR, WA MIX, LP LEEPER, RJ MAENCHEN, J WENGER, DF MATTSON, CR MURON, DJ TI ION MOVIE CAMERA FOR PARTICLE-BEAM-FUSION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A camera with a 3 ns time resolution and a continuous (> 100 ns) record length has been developed to image a 10(12)-10(13) W/cm2 ion beam for inertial-confinement-fusion experiments. A thin gold Rutherford-scattering foil placed in the path of the beam scatters ions into the camera. The foil is in a near-optimized scattering geometry and reduces the beam intensity approximately seven orders of magnitude. The scattered ions are pinhole imaged onto a 2D array of 3 9 p-i-n diode detectors; outputs are recorded on LeCroy 6880 transient-waveform digitizers. The waveforms are analyzed and combined to produce a 39-pixel movie which can be displayed on an image processor to provide time-resolved horizontal- and vertical-focusing information. RP STYGAR, WA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4860 EP 4862 DI 10.1063/1.1143532 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300098 ER PT J AU MIX, LP STYGAR, WA LEEPER, RJ MAENCHEN, JE WENGER, DF AF MIX, LP STYGAR, WA LEEPER, RJ MAENCHEN, JE WENGER, DF TI TIME-RESOLVED MEASUREMENTS OF THE FOCUSED ION-BEAMS ON PBFA-II SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A time-resolved camera has been developed to image the intense ion beam focus on PBFA II. Focused ions from a sector of the ion diode are Rutherford scattered from a thin gold foil on the diode axis and pinhole imaged onto an array of up to 49 PIN detectors to obtain the spatially and temporally resolved images. The signals from these detectors are combined to provide a movie of the beam focus with a time resolution of about 3 ns and a spatial resolution of 2 mm over a 12 mm field of view. Monte Carlo simulations of the camera response are used with the measured ion energy to account for the time-of-flight dispersion of the beam and to convert the recorded signals to an intensity. From measurements on an 81-degrees sector of the diode, average intensities on a 6 mm sphere of about 5 TW/cm2 and energies approaching 80 kJ/cm2 are calculated for standard proton diodes. Corresponding numbers for a lithium diode are less than those measured with protons. The details of the analysis and image reconstruction will be presented along with scaled images from recent ion focusing experiments. RP MIX, LP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 3 TC 6 Z9 6 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4863 EP 4865 DI 10.1063/1.1143533 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300099 ER PT J AU NELSON, MB CABLE, MD AF NELSON, MB CABLE, MD TI LANSA - A LARGE NEUTRON SCINTILLATOR ARRAY FOR NEUTRON SPECTROSCOPY AT NOVA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A very sensitive neutron time-of-flight spectrometer is now in use at Nova. LaNSA consists of 960 channels of a neutron sensitive liquid scintillator (10 X 10 X 10 cm) coupled to a photomultiplier tube followed by a discriminator, TDC, and ADC to allow the measurement of neutron arrival time as well as pulse size. LaNSA is capable of measuring yields as low as 2.3 X 10(5) DT neutrons (100 detected hits) with resolution of 2.3 ns (170 keV for 14-MeV neutrons with 20-m flight path). Shielding and collimation provide background levels low enough to allow measurement of secondary and tertiary reaction neutrons. Details of design, testing, calibration, and experimental results will be presented. RP NELSON, MB (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 3 TC 26 Z9 30 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4874 EP 4876 DI 10.1063/1.1143536 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300102 ER PT J AU LERCHE, RA HATCHETT, SP CABLE, MD NELSON, MB MURPHY, TJ AF LERCHE, RA HATCHETT, SP CABLE, MD NELSON, MB MURPHY, TJ TI PLASMA TEMPERATURES FROM 1ST-HIT NEUTRON TIME-OF-FLIGHT SPECTRA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We describe a new technique for determining an inertial-confinement-fusion plasma temperature from a neutron time-of-flight spectrum recorded with a multielement detector array-even when each array element becomes fully saturated. A temperature uncertainty < 20% is achieved over a yield range > 10 000 using a 960-element array. Analysis of a spectrum formed by the first detected neutron (first hit) in each array element is used to determine the full spectrum's temporal width. Temperatures for deuterium filled capsules have been determined from spectra recorded with the 20-m, 960-element LaNSA detector. A temperature of 0.88+/-0.09 keV was determined for a capsule producing only 1.4 X 10(6) neutrons. Temperatures determined for capsules yielding more than 2 X 10(9) neutrons are consistent with those determined with a 20-m current-mode time-of-flight detector. RP LERCHE, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,L-473,LIVERMORE,CA 94550, USA. RI Murphy, Thomas/F-3101-2014 OI Murphy, Thomas/0000-0002-6137-9873 NR 5 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4877 EP 4879 DI 10.1063/1.1143537 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300103 ER PT J AU LERCHE, RA MURPHY, TJ AF LERCHE, RA MURPHY, TJ TI GEOMETRY COMPENSATION FOR IMPROVING SPEED AND EFFICIENCY OF SCINTILLATOR-BASED NEUTRON TIME-OF-FLIGHT DETECTORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID IMPLOSIONS AB Scintillator-based neutron detectors record time-of-flight (TOF) information used for estimating inertial-confinement-fusion plasma temperatures. Nova TOF detectors, which have 1.3 ns resolution and contain 30 cm3 of scintillator, lack the combination of temporal resolution and sensitivity necessary to measure 1 keV temperatures for deuterium plasmas emitting fewer than 1.5 X 10(9) neutrons. Significant time dispersion is caused by neutron detection-point uncertainty in thick scintillators. We describe a geometrical compensation technique by which this dispersion can be substantially reduced while retaining large scintillator volume. We estimate that scintillator/streak camera detectors can achieve 100 ps resolution for 2.45 MeV neutrons, and that scintillator/photomultiplier systems can achieve 150-300 ps resolution. RP LERCHE, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,L-473,LIVERMORE,CA 94550, USA. RI Murphy, Thomas/F-3101-2014 OI Murphy, Thomas/0000-0002-6137-9873 NR 5 TC 11 Z9 12 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4880 EP 4882 DI 10.1063/1.1143538 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300104 ER PT J AU MURPHY, TJ LERCHE, RA AF MURPHY, TJ LERCHE, RA TI DEVELOPMENT OF A GEOMETRY-COMPENSATED NEUTRON TIME-OF-FLIGHT DETECTOR FOR ICF APPLICATIONS WITH APPROXIMATELY 200-PS TIME RESPONSE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID IMPLOSIONS AB Current-mode neutron time-of-flight detectors are use on Nova for neutron yield, ion temperature, and neutron emission time measurements. Currently used detectors are limited by the time response of the microchannel plate photomultiplier tubes used with the scintillators, scintillator decay time, scintillator thickness, and oscilloscope response time. A change in the geometry of the scintillator allows one to take advantage of the increased time resolution made possible by more advanced transient recorders and microchannel plate photomultiplier tubes. A prototype detector has been designed to incorporate these changes, and could potentially yield time resolution of less than 150 ps. Experimental results are presented demonstrating an ion temperature measurement of a direct-drive DT implosion on Nova. RP MURPHY, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. RI Murphy, Thomas/F-3101-2014 OI Murphy, Thomas/0000-0002-6137-9873 NR 9 TC 9 Z9 10 U1 0 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 4883 EP 4885 DI 10.1063/1.1143539 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300105 ER PT J AU CHRIEN, RE SIMMONS, DF HOLMBERG, DL AF CHRIEN, RE SIMMONS, DF HOLMBERG, DL TI NEUTRON TIME-OF-FLIGHT ION TEMPERATURE DIAGNOSTIC FOR INERTIAL-CONFINEMENT-FUSION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We are constructing a T(i) diagnostic for low neutron yield (5 X 10(7) to above 10(9)) d-d and d-t targets in the Nova facility at Livermore. The diagnostic measures the neutron energy spread with 960 scintillator-photomultiplier detectors located 28 m from the target and operates in the single-hit mode. Each detector can measure a single neutron arrival with time resolution of 1 ns or better. The arrival time distribution is constructed from the results of typically 200-500 detector measurements. The ion temperature is determined from the spread in neutron energy DELTAE(n) is-proportional-to T(i)1/2 which is related to the arrival time spread by DELTAt/t congruent-to -(1/2) DELTAE(n)/E(n). Each neutron arrival is detected by using a photomultiplier tube to observe the recoil proton from elastic scattering in a fast plastic scintillator. The timing electronics for each channel consist of a novel constant fraction-like discriminator and a multiple hit time-to-digital converter. The overall system design, together with single-channel performance data, is presented. C1 EG&G ENERGY MEASUREMENTS INC,LAS VEGAS,NV 89030. RP CHRIEN, RE (reprint author), LOS ALAMOS NATL LAB,MS-D410,LOS ALAMOS,NM 87545, USA. NR 7 TC 15 Z9 15 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4886 EP 4888 DI 10.1063/1.1143540 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300106 ER PT J AU RUIZ, CL LEEPER, RJ SCHMIDLAPP, FA COOPER, G MALBROUGH, DJ AF RUIZ, CL LEEPER, RJ SCHMIDLAPP, FA COOPER, G MALBROUGH, DJ TI ABSOLUTE CALIBRATION OF A TOTAL YIELD INDIUM ACTIVATION DETECTOR FOR DD AND DT NEUTRONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Progress in Z-pinch experiments at Sandia's Saturn facility have underscored a need for an absolute yield measurement for DD fusion neutrons. The technique chosen for making this absolute yield measurement was neutron activation of indium metal samples. To calibrate the technique, a 175-keV deuteron beam was allowed to impinge on a 3.0-mum-thick erbium deuteride target, producing neutrons through the (H(d,n)He)-H-2-He-3 fusion reaction. The neutron flux produced at 0-degrees and incident on nominal 5-g indium samples was determined by the associated particle method. This method employed protons measured from the (H(dp)H)-H-2-H-3 reaction to infer the neutron flux produced. After neutron irradiation, the activity of the indium samples was measured with a Ge gamma-ray detector. The total activity of the metastable state In-115m (336.23 keV) was measured, compared with the total incident flux, and a calibration factor (indium counts/neutron/gram of indium) determined. For completeness, a calibration factor for DT neutrons from the (H(d,n)He)-H-3-He-4 fusion reaction was also obtained through the measured activity of the metastable state In-114m(190.29 keV). The experiment and the measured calibration factors for both reactions are described in the paper. C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87106. GE,ST PETERSBURG,FL 33733. RP RUIZ, CL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 18 Z9 19 U1 0 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 4889 EP 4891 DI 10.1063/1.1143541 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300107 ER PT J AU COLLOPY, MT CARPENTER, P HARMON, CD VANDENBERG, J COOPER, GW RUIZ, CL REYES, P STYGAR, WA SCHMIDLAPP, A MALBROUGH, DJ BECKER, R AF COLLOPY, MT CARPENTER, P HARMON, CD VANDENBERG, J COOPER, GW RUIZ, CL REYES, P STYGAR, WA SCHMIDLAPP, A MALBROUGH, DJ BECKER, R TI CALIBRATION OF CR-39 FOR DETECTING FUSION NEUTRONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We have measured the efficiency (tracks per incident neutron) of pure CR-39 for detecting DD and DT neutrons. Neutrons having average energies of 2.9 MeV (DD) and 14.8 MeV (DT) were produced by a 200-keV electrostatic accelerator and the neutron yields were measured using the associated particle counting technique. All CR-39 samples irradiated by DD or DT neutrons were etched for 2 h in a 70-degrees, 6.25-N NaOH bath. For bare CR-39, the efficiencies for detecting 2.9- and 14.8-MeV neutrons were found to be (1.3+/-0.4)X 10(-4) and (5.0+/-1.8) X 10(-5), respectively. We also investigated using CR-39 and polyimide as proton radiators. For detecting 2.9-MeV neutrons, the radiators had no significant effect on efficiency; but for detecting 14.8-MeV neutrons the polyimide radiator increased the efficiency to (7.8+/-2.8) X 10(-5). C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. GE,ST PETERSBURG,FL 34649. RP COLLOPY, MT (reprint author), UNIV NEW MEXICO,ALBUQUERQUE,NM 87131, USA. NR 9 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4892 EP 4894 DI 10.1063/1.1143542 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300108 ER PT J AU LAPIN, SN COOPER, GW DAVIS, L BAILEY, JE STYGAR, WA CARLSON, A REYES, P AF LAPIN, SN COOPER, GW DAVIS, L BAILEY, JE STYGAR, WA CARLSON, A REYES, P TI RANGE AND STRAGGLING EFFECTS ON CR-39 RANGE-FILTER ION ENERGY MEASUREMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID NEUTRON AB The CR-39/range-filter technique measures ion energy by determining the maximum filter thickness which ions can penetrate. CR-39 located behind the filter records the ions. This method is used to measure peak voltage in pulsed power accelerators. We investigated range and straggling effects in this diagnostic by exposing it to 8- and 15-MeV protons for both Al and Ta filters. The range agreed with published values to better than +/- 6%. The range straggling decreased for higher incident ion energy and lower atomic number, as expected, although there were differences up to a factor of 1.7 between the experimental values and predictions. The dependence of the track diameter distribution on ion energy enabled us to establish a signature which is characteristic of ions which penetrate a filter, via straggling. These results can be used to evaluate the errors present when this diagnostic is used to measure accelerator voltage. C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP LAPIN, SN (reprint author), POD ASSOCIATES INC,ALBUQUERQUE,NM 87106, USA. NR 7 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4895 EP 4897 DI 10.1063/1.1143543 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300109 ER PT J AU JONES, SC SWEET, JA FEHL, DL SUJKA, BR VEHAR, DW WESTFALL, RL AF JONES, SC SWEET, JA FEHL, DL SUJKA, BR VEHAR, DW WESTFALL, RL TI COMPARISON OF LASER AND CONVENTIONAL HEATING IN THERMOLUMINESCENCE DOSIMETRY DOSEMAPPING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A new, laser-based system has been developed for rapid evaluation of monolithic thermoluminescence dosimetry (TLD) arrays. A precision-controlled CO2 laser is used to sequentially heat 1.5-mm-diam, 38-mum-thick TLDs, deposited on a 0.125-mm-thick polymer substrate in a 3 mm X 3 mm grid. Array areas up to 30 cm X 30 cm are used ( > 10 000 TLD elements), with evaluation times of 45-90 min. Isodose contours and various analysis functions are available on the system-operating PC. This system allows for greatly expanded dosimetry compared to standard TLDs, simultaneously decreasing effort and record keeping. We compared the dosimetric characteristics of this system with standard techniques, using near Si-equivalent CaF2:Mn TLD elements, in a test with 19 MeV end-point x radiation. The results show the laser system performs as well as the standard system. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP JONES, SC (reprint author), INT SENSOR TECHNOL INC,PULLMAN,WA 99163, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4898 EP 4900 DI 10.1063/1.1143544 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300110 ER PT J AU CARLSTROM, TN CAMPBELL, GL DEBOO, JC EVANKO, R EVANS, J GREENFIELD, CM HASKOVEC, J HSIEH, CL MCKEE, E SNIDER, RT STOCKDALE, R TROST, PK THOMAS, MP AF CARLSTROM, TN CAMPBELL, GL DEBOO, JC EVANKO, R EVANS, J GREENFIELD, CM HASKOVEC, J HSIEH, CL MCKEE, E SNIDER, RT STOCKDALE, R TROST, PK THOMAS, MP TI DESIGN AND OPERATION OF THE MULTIPULSE THOMSON SCATTERING DIAGNOSTIC ON DIII-D SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID SYSTEM AB This paper describes the design and operation of a 40 spatial channel Thomson scattering system that uses multiple 20-Hz Nd:YAG lasers to measure the electron temperature and density profiles periodically throughout an entire plasma discharge. As many as eight lasers may be fired alternately for an average measurement frequency of 160 Hz, or they may be fired in rapid succession ( < 10 kHz), producing a burst of pulses for measuring transient events. The high spatial resolution (1.3 cm) and wide dynamic range (10 eV-20 keV) enable this system to resolve large electron density and temperature gradients formed at the plasma edge and in the scrape-off layer during H-mode operation. These features provide a formidable tool for studying L-H transitions, edge localized modes (ELMs), beta limits, transport, and disruptions in an efficient manner suitable for large tokamak operation where shot-to-shot scans are impractical. The scattered light is dispersed by interference filter polychromators and detected by silicon avalanche photodiodes. Laser control and data acquisition are performed in real time by a VME-based microcomputer. Data analysis is performed by a MicroVAX 3400. Additional features of this system include real-time analysis capability, full statistical treatment of error bars based on the measured background light, and laser beam quality and alignment monitoring during plasma operation. Results of component testing, calibration, plasma operation, and error analysis are presented. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CARLSTROM, TN (reprint author), GEN ATOM,SAN DIEGO,CA 92186, USA. NR 10 TC 217 Z9 219 U1 2 U2 12 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 OCT PY 1992 VL 63 IS 10 BP 4901 EP 4906 DI 10.1063/1.1143545 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300111 ER PT J AU DURST, RD FONCK, RJ COSBY, G EVENSEN, H PAUL, SF AF DURST, RD FONCK, RJ COSBY, G EVENSEN, H PAUL, SF TI DENSITY FLUCTUATION MEASUREMENTS VIA BEAM EMISSION-SPECTROSCOPY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID ANOMALOUS TRANSPORT; TOKAMAKS; TFTR AB Previous studies of plasma microturbulence have indicated that the fluctuation power scales with radial wave number, k(perpendicular-to), like k(perpendicular-to)-2 --> k(perpendicular-to)-3.5 for k(perpendicular-to) > 2 cm-1. This implies that low k fluctuations may dominate the spectrum. Beam emission spectroscopy (BES) has been developed to provide spatially localized measurements of density fluctuations in this low k region of the spectrum (k(perpendicular-to) < 2 cm-1). A 20-channel system has been installed on TFTR which images one of the heating neutral beams (via fiber optics) onto a set of photoconductive photodiode detectors. Fluctuations in the fluorescent D(alpha) emission from the beam can be related to the local plasma density fluctuations via a model of the atomic excitation processes. The analysis of BES data utilizes many of the standard statistical analysis techniques such as power spectra, coherency and cross phase, and correlation analysis which are also used in the analysis of, for example, Langmuir probe data. In the case of BES however, these techniques require some special modifications to account for systematic effects such as photon statistics and fluctuations in the neutral beam density induced by the strong fluctuations near the plasma edge. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08541. RP DURST, RD (reprint author), UNIV WISCONSIN,MADISON,WI 53706, USA. NR 14 TC 59 Z9 59 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4907 EP 4912 DI 10.1063/1.1143546 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300112 ER PT J AU PAUL, SF CYLINDER, D DURST, RD FONCK, RJ AF PAUL, SF CYLINDER, D DURST, RD FONCK, RJ TI MECHANIZED SELECTION OF FIBER OPTIC ARRAYS FOR SPECTROSCOPY MEASUREMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID BEAM AB A 400-fiber optic bundle has been installed as part of the beam emission spectroscopy diagnostic for measuring density fluctuations in Tokamak Fusion Test Reactor. One hundred bundles, each composed of four 1-mm-diam fibers, transmit H(alpha) light 50 m away to 20 detectors located outside the radiation area. To shorten the time spent manually switching the bundles among the 20 detectors, a mechanized fiber selector was installed. The fiber bundles were separated into radial and poloidal groups of 220 and 180 fibers and coupled by a computer-controlled, motorized precision translation stage. The fibers were fastened to a plate and placed less than 0.003 in. from an identical plate that holds a similar array of fibers which transmits the light to the detectors. Holding the fiber spacing tolerance to 0.001 in., and using refractive index matching fluid, the highest measured loss was less than 0.5 dB, and generally was very small compared to the fiber's insertion loss. The stages are actuated with precision encoded micrometers and controlled by the beam emission spectroscopy VAX-resident software via a RS-232/CAMAC interface allowing arbitrary selections of fibers between plasma discharges with a 5 min repetition rate. RP PAUL, SF (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4921 EP 4923 DI 10.1063/1.1143549 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300114 ER PT J AU FONCK, RJ ASHLEY, R DURST, R PAUL, SF RENDA, G AF FONCK, RJ ASHLEY, R DURST, R PAUL, SF RENDA, G TI LOW-NOISE PHOTODIODE DETECTOR FOR OPTICAL FLUCTUATION DIAGNOSTICS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TOKAMAK AB The beam emission spectroscopy optical fluctuation diagnostic requires the highest possible quantum efficiency detector at 656 nm to minimize the photon statistical baseline limit to the detectable fluctuation level. A photoconductive photodiode detector with an extremely low-noise preamplifier and a reactive feedback circuit provides quantum efficiencies up to 70%-80% for a useful frequency range of at least 0-150 kHz with incident powers of approximately 10 nW. The diodes are chosen for negligible leakage current and hence do not require active cooling. These detectors have provided increase in the sensitivity to plasma fluctuation amplitude by a factor of approximately 14 over photomultipliers and a factor of 4 over large area avalanche photodiodes. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP FONCK, RJ (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706, USA. NR 6 TC 26 Z9 27 U1 0 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 4924 EP 4926 DI 10.1063/1.1143550 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300115 ER PT J AU GIANAKON, TA FONCK, RJ CALLEN, JD DURST, RD KIM, JS PAUL, SF AF GIANAKON, TA FONCK, RJ CALLEN, JD DURST, RD KIM, JS PAUL, SF TI EFFECTS OF EDGE PLASMA TURBULENCE ON RADIAL CORRELATION LENGTH MEASUREMENTS WITH BES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID FLUCTUATION AB The recently developed technique of beam emission spectroscopy (BES) provides a tool to study long-wavelength density turbulence (coherence length much greater than ion gyroradius) in hot tokamak plasmas. To provide an accurate conversion of the measured light intensity fluctuations to a local n/n density fluctuation and to assess the influence of density fluctuations in the neutral beam induced by large edge turbulence, a multistate neutral beam excitation/transport code for realistic experimental geometries has been written. Results from this code show that the attenuation of the beam density induced by edge turbulence can give rise to significant levels of common-mode fluctuation power in signals from the plasma core and that the derivation of quantitative values of n/n from experimental measurements depends weakly on the radial extent of the density fluctuations. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP GIANAKON, TA (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706, USA. NR 7 TC 23 Z9 23 U1 0 U2 4 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 OCT PY 1992 VL 63 IS 10 BP 4931 EP 4933 DI 10.1063/1.1143553 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300117 ER PT J AU REJ, DJ HENINS, I FONCK, RJ KIM, YJ AF REJ, DJ HENINS, I FONCK, RJ KIM, YJ TI INTENSE DIAGNOSTIC NEUTRAL BEAM DEVELOPMENT FOR ITER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID ION AB For the next generation, burning tokamak plasmas such as in the International Thermonuclear Experimental Reactor (ITER), diagnostic neutral beams and beam spectroscopy will continue to be used to determine a variety of plasmas parameters such as ion temperature, rotation, fluctuations, impurity content, current density profile, and confined alpha particle density and energy distribution. Present-day low-current, long-pulse beam technology will be unable to provide the required signal intensities because of higher beam attenuation and background bremsstrahlung radiation in these larger, higher-density plasmas. To address this problem, we are developing a short-pulse, intense diagnostic neutral beam. Protons or deuterons are accelerated using magnetic-insulated ion-diode technology, and neutralized in a transient gas cell. A prototype 50-kA, 100-kV, 1-mus accelerator is under construction at Los Alamos. Initial experiments will focus on ITER-related issues of beam energy distribution, current density, pulse length, divergence, propagation, impurity content, reproducibility, and maintenance. C1 UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706. RP REJ, DJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 9 TC 16 Z9 16 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4934 EP 4936 DI 10.1063/1.1143554 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300118 ER PT J AU SCHILLING, G SYNAKOWSKI, EJ AF SCHILLING, G SYNAKOWSKI, EJ TI MODELING OF A DIAGNOSTIC NEUTRAL BEAM FOR ITER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID FUSION PLASMAS AB A neutral hydrogen beam has been modeled to serve as an energetic particle source for the measurement of ion temperature profiles via charge-exchange recombination spectroscopy. Calculation of the neutral beam attenuation uses the multistep ionization cross sections of Boley, Janev, and Post. Whereas beam penetration toward the center of the discharge increases with increasing beam energy, the relevant charge-exchange cross section for the familiar C5+ n = 8-7 transition decreases above 50 keV, leading to an optimum beam energy that yields the maximum charge exchange brightness for each set of plasma conditions. This energy is in the range of 100-150 keV. As a consequence of the high plasma density, temperature, and machine size, the detected signal is dominated by visible bremsstrahlung integrated along the detector sightline, placing a premium on beam intensity, beam current density, and beam chopping with synchronous detection. RP SCHILLING, G (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 6 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4937 EP 4939 DI 10.1063/1.1143555 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300119 ER PT J AU JOHNSON, D DIMOCK, D GREK, B PALLADINO, R TOLNAS, E AF JOHNSON, D DIMOCK, D GREK, B PALLADINO, R TOLNAS, E TI ALIGNMENT OF TFTR THOMSON SCATTERING SYSTEM SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A technique is described for maintaining the highly precise alignment needed for accurate density profile measurements with the TFTR Thomson scattering system. The method uses the transverse coherence of the fiber bundles in the collection optics to encode the alignment information in the spatial distribution of the scattered light signal. A scheme for decoding this information is demonstrated and the limitations of this technique are discussed. RP JOHNSON, D (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 4 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4954 EP 4956 DI 10.1063/1.1143509 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300124 ER PT J AU GREK, B SANNIKOV, V BARTOLICK, J GORSHKOV, A LHOR, J AF GREK, B SANNIKOV, V BARTOLICK, J GORSHKOV, A LHOR, J TI SMALL-ANGLE THOMSON SCATTERING SYSTEM FOR CURRENT-DENSITY AND ELECTRON-DISTRIBUTION FUNCTION MEASUREMENTS ON T-10 SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB As part of a US-USSR collaboration on electron cyclotron heating and current drive, a small-angle Thomson scattering system has been designed and installed on the T-10 tokamak at the Kurchatov Institute of Atomic Energy. The system makes use of a 20-J Nd-glass laser, provided by Kurchatov, that can deliver up to four pulses at energies greater than 20 J. The detection system uses an axicon-based collection optics and high quantum efficiency avalanche photodiodes. The combination of high laser power, high quantum efficiency of the photodiodes, and the small scattering angle geometry make it possible to observe either the perpendicular or parallel (to the tokamak magnetic field) electron distribution function to energies greater than three times the electron thermal energy, at plasma densities of 10(13)/cm3. C1 IV KURCHATOV ATOM ENERGY INST,MOSCOW,USSR. GEN ATOM,SAN DIEGO,CA 92186. RP GREK, B (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08534, USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4957 EP 4960 DI 10.1063/1.1143510 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300125 ER PT J AU MA, CH BAYLOR, LR HUTCHINSON, DP MURAKAMI, M WILGEN, JB AF MA, CH BAYLOR, LR HUTCHINSON, DP MURAKAMI, M WILGEN, JB TI DENSITY PROFILE MEASUREMENT USING A MULTICHANNEL DIFLUOROMETHANE LASER INTERFEROMETER SYSTEM ON ATF SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Recent results of the electron density profile measurement on the Advanced Toroidal Facility are presented. A multichannel difluoromethane laser interferometer system has been routinely employed to study density evolution in electron cyclotron heated as well as neutral-beam-heated plasma discharges with gas fueling and pellet injection. A chordal inversion code has been developed, and has been used successfully to reconstruct the asymmetric density profiles. Cross-correlation of density profiles measurements among far-infrared interferometer, Thomson scattering, the heavy-ion beam probe, and the fast reciprocating Langmuir probe has been achieved. Radial density profiles measured by the four diagnostics are generally in good agreement and are hollow profiles under most experimental conditions. RP MA, CH (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4981 EP 4982 DI 10.1063/1.1143518 PN 2 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300132 ER PT J AU SERGEEV, VY MARMAR, ES SNIPES, JA TERRY, JL PARK, H MANSFIELD, DK BELL, M MCCUNE, D AF SERGEEV, VY MARMAR, ES SNIPES, JA TERRY, JL PARK, H MANSFIELD, DK BELL, M MCCUNE, D TI LITHIUM PELLET DEPOSITION AND PENETRATION IN TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID HYDROGEN PELLET; INJECTION; ABLATION; PROFILE; TOKAMAK AB The electron deposition resulting from the injection of Li pellets into Tokamak Fusion Test Reactor, measured by a multichannel (10) infrared interferometer, is compared with that deduced from the pellet ablation cloud emission, measured by a filtered diode array which views the pellet from behind. By assuming that the ablation rate N(r) is proportional to the pellet cloud emissivity, which is dominated by Li+ line emission in the 548.5 +/- 5 nm bandpass of the interference filter, the post-pellet, line averaged density perturbations along the interferometer chords were calculated and compared with those measured. Good agreement is observed. The experimental ablation rate profiles obtained using the emissivity have also been compared with predictions of the theoretical models. There is an agreement between the time history of the emissivity and the predicted ablation rate at the plasma edge where the electron temperature values are less than 1-1.5 keV. When the pellet penetrates more deeply, the experimental N(r) values are systematically smaller than those predicted. This points out the necessity of taking into account plasma shielding and/or precooling of the target plasma during pellet injection in the ablation model. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RP SERGEEV, VY (reprint author), TECH UNIV ST PETERSBURG,DEPT PLASMA PHYS,ST PETERSBURG 195251,USSR. NR 18 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4984 EP 4986 DI 10.1063/1.1143521 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300133 ER PT J AU RICE, BW AF RICE, BW TI 15 CHORD FIR POLARIMETRY SYSTEM ON MTX SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TOKAMAK; PLASMA; FIELD AB A far-infrared polarimeter diagnostic has been added to an existing fifteen chord interferometer on the Microwave Tokamak Experiment (MTX). The polarimeter utilizes a new technique for determination of the Faraday rotation angle based on phase measurements of a rotating polarization ellipse. This technique allows the rotation angle to be determined even in the presence of signal amplitude variations caused by refraction. The implementation of this instrument requires no new detectors and minimal optics, making it quite inexpensive to add on to existing multichord interferometers. The MTX polarimeter has been operating for about a year and has achieved a resolution of less-than-or-equal-to 0.2-degrees with a bandwidth of congruent-to 1 kHz and a chord spacing of 1.5 cm. Typical Faraday rotation angles on MTX are in the range of 5-degrees-15-degrees. To obtain the poloidal field, the line-integrated density and Faraday rotation profiles are inverted in a manner consistent with the Grad-Shafranov equilibrium to first order in the inverse aspect-ratio expansion. Profile measurements during normal ohmic operation are presented. RP RICE, BW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L637,LIVERMORE,CA 94550, USA. NR 9 TC 30 Z9 30 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5002 EP 5004 DI 10.1063/1.1143527 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300139 ER PT J AU HAMMEL, BA KEANE, CJ KANIA, DR KILKENNY, JD LEE, RW PASHA, R TURNER, RE DELAMATER, ND AF HAMMEL, BA KEANE, CJ KANIA, DR KILKENNY, JD LEE, RW PASHA, R TURNER, RE DELAMATER, ND TI K-SHELL AND L-SHELL X-RAY SPECTROSCOPY OF INDIRECTLY DRIVEN IMPLOSIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID PHOTON-ESCAPE PROBABILITIES; HIGH-DENSITY; LINE-SHAPES; PLASMAS; DIAGNOSIS; EQUATION; 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 high-Z dopants (Ar and Xe) 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. The higher densities are achieved on targets that are driven with a shaped laser drive that allows a more isentropic compression of the fuel. Emission from high-Z pusher dopants have also been studied. These dopants can provide information on pusher conditions and can be used to study mix at the pusher fuel interface. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HAMMEL, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 TC 31 Z9 36 U1 0 U2 4 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 OCT PY 1992 VL 63 IS 10 BP 5017 EP 5021 DI 10.1063/1.1143477 PN 2 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300143 ER PT J AU BEIERSDORFER, P SCHNEIDER, MB BITTER, M VONGOELER, S AF BEIERSDORFER, P SCHNEIDER, MB BITTER, M VONGOELER, S TI MEASUREMENTS OF THE CONTRIBUTIONS FROM HIGH-N DIELECTRONIC SATELLITES TO THE K-ALPHA RESONANCE LINE IN HELIUM-LIKE FE-24(+) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID BEAM ION TRAP; RAY CRYSTAL SPECTROMETER; FUSION-TEST REACTOR; RESOLUTION X-RAY; ROTATION VELOCITY; PLASMA ROTATION; IRON SPECTRA; TEMPERATURE; SPECTROSCOPY; POLARIZATION AB Measurements are presented on the contributions from dielectronic satellite transitions upper configurations 1s2lnl', n greater-than-or-equal-to 3 to the characteristic x-ray emission of heliumlike Fe24+ . The measurements were carried out on the electron beam ion trap at Livermore using high-resolution Bragg-crystal spectroscopy. By eliminating uncertainties in the location and magnitude of the satellite contributions inherent in theoretical predictions the measurements improve the use of the resonance line emission of heliumlike Fe 24+ as a diagnostic of ion temperature and rotation velocity of high-temperature plasmas. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP BEIERSDORFER, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 16 TC 29 Z9 29 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5029 EP 5031 DI 10.1063/1.1143482 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300146 ER PT J AU HILL, KW YOUNG, KM BITTER, M VONGOELER, S HSUAN, H HULSE, R KU, LP STRATTON, BC KRIEGER, AS PARSIGNAULT, D FRANCO, ED AF HILL, KW YOUNG, KM BITTER, M VONGOELER, S HSUAN, H HULSE, R KU, LP STRATTON, BC KRIEGER, AS PARSIGNAULT, D FRANCO, ED TI ITER X-RAY DIAGNOSTIC STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TOKAMAK; PLASMAS; LINES AB Present-day tokamak x-ray imaging (XIS) and pulse height analysis (PHA) diagnostics will require special shielding and x-ray optics to permit use on fusion reactors without prohibitive noise and detector damage from neutrons and gamma rays; x-ray curved-crystal spectrometers (XCS) may work with extensive shielding and collimation, but radiation damage of crystals and attainment of adequate impurity concentrations for ion-temperature measurement are concerns. We consider the use of one or more reflections at grazing incidence from x-ray mirrors or from Bragg layered synthetic microstructures (LSM) to decouple the x-ray diagnostic from the direct fusion neutron beam. We present calculations of expected x-ray line brightnesses from ITER and total instrument throughput. We also consider the use of hollow glass capillaries embedded in radiation shields to precede the XIS detector and reduce the ratio of neutron plus gamma radiation to x rays by a factor of approximately 0.01 or better. Compatibility of capillary schemes with the PHA and XCS are discussed. C1 RADIAT SCI INC,CAMBRIDGE,MA 02138. ARACOR CORP,SUNNYVALE,CA 94086. RP HILL, KW (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 11 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5032 EP 5034 DI 10.1063/1.1143483 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300147 ER PT J AU BENAGE, JF SHERWOOD, EG LINZEY, SE AF BENAGE, JF SHERWOOD, EG LINZEY, SE TI PLASMA TEMPERATURE-MEASUREMENTS USING A TIME AND SPATIALLY RESOLVED X-RAY-CAMERA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID SPECTROSCOPY; DENSITY AB We have developed a diagnostic for measuring the blackbody temperature of a dense plasma produced in a high power capillary discharge. This diagnostic can be described as a filtered x-ray pinhole framing camera. The camera consists of a stripline microchannel plate and a filtered pinhole array. The camera is capable of producing two-dimensional images with time and spectral resolution. We utilize this camera to measure the temperature of a dense optically thick plasma. The imaging also enables us to determine temperature profiles and spatial effects which cannot be determined with other methods such as filtered x-ray diodes. We will present a complete description of the camera, our procedure for using it, and results from the experiment we carried out. RP BENAGE, JF (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5049 EP 5051 DI 10.1063/1.1143488 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300152 ER PT J AU SPIELMAN, RB AF SPIELMAN, RB TI A 5-CHANNEL, DIAMOND PHOTOCONDUCTING X-RAY-DETECTOR ARRAY FOR Z-PINCH EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We have built a five-channel, x-ray detector array based on diamond photoconducting detectors (PCDs). The diamond elements have dimensions of 3 mm x 1 mm X 1 mm (or 0.5 mm). We use diamond PCDs for their stability, flat spectral response, and low leakage currents. The good time response of diamond PCDs is due to the 100-ps electron/hole recombination time. Filters were designed to give information in the 1-10-keV spectral region. Calibration of the diamond PCDs showed sensitivities between 4 and 7 x 10(-4) A/W for a bias of 100 V. We shall present data from z-pinch experiments on Saturn. RP SPIELMAN, RB (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 10 TC 34 Z9 35 U1 0 U2 4 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 OCT PY 1992 VL 63 IS 10 BP 5056 EP 5058 DI 10.1063/1.1143490 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300154 ER PT J AU MACFARLANE, JJ WANG, P MEHLHORN, TA BAILEY, J DUKART, RJ AF MACFARLANE, JJ WANG, P MEHLHORN, TA BAILEY, J DUKART, RJ TI ALUMINUM K-SHELL LINE EMISSION AS A DIAGNOSTIC IN LIGHT-ION BEAM FUSION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID LASER-PRODUCED PLASMA; ABSORPTION-SPECTROSCOPY; DENSITY; TARGET AB K(alpha) satellite line emission from targets irradiated by intense light ion beams can be used to diagnose plasma temperatures and densities. The fluorescence lines are created as 2p electrons drop down to fill Is vacancies that result from ion beam-induced ionizations. We present results from collisional-radiative equilibrium calculations for thin A1 diagnostic layers to illustrate the dependence of the K(alpha) emission spectrum On temperature, density, and layer thickness. We also discuss the effects of opacity on the spectrum and the contribution from K(alpha) transitions involving excited states. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP MACFARLANE, JJ (reprint author), UNIV WISCONSIN,FUS TECHNOL INST,MADISON,WI 53706, USA. NR 18 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5062 EP 5064 DI 10.1063/1.1143492 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300156 ER PT J AU MOATS, AR DERZON, MS JOHNSON, DJ NELSON, WE PANTUSO, JG RUIZ, CL WENGER, DF AF MOATS, AR DERZON, MS JOHNSON, DJ NELSON, WE PANTUSO, JG RUIZ, CL WENGER, DF TI MEASUREMENT OF BEAM PROPERTIES AND REPRODUCIBILITY ON RECENT PBFA-II TARGET SHOTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID X-RAY RESPONSE; PHOTOGRAPHIC FILMS; MODELS AB Recent proton experiments on Particle Beam Fusion Accelerator II used a 2 mum gold foil cone to characterize the ion beam. Using the ion beam images obtained by viewing beam-induced characteristic line radiation emitted by such foils with time-integrated x-ray pinhole cameras, the beam centroid axial location and azimuthal symmetry have been analyzed for a recent series of target shots. Azimuthal symmetry on the target midplane on individual shots varied from 6% to 29%. Averaged over the entire series of shots, inferred intensities on the target midplane varied by 24% to 37% from quadrant to quadrant. The beam profiles and beam reproducibility are vital to the interpretation of the results of these target experiments. RP MOATS, AR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5065 EP 5067 DI 10.1063/1.1143493 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300157 ER PT J AU DERZON, M AUBERT, J BAILEY, J CARLSON, A CHANDLER, G DERZON, D DUKART, R HUMPHREYS, R HUNTER, J JOHNSON, D MATZERN, K MIX, P MOATS, A OLSON, R PANTUSO, J ROCKETT, P RUIZ, C SAWYER, P TORRES, J HUSSEY, T AF DERZON, M AUBERT, J BAILEY, J CARLSON, A CHANDLER, G DERZON, D DUKART, R HUMPHREYS, R HUNTER, J JOHNSON, D MATZERN, K MIX, P MOATS, A OLSON, R PANTUSO, J ROCKETT, P RUIZ, C SAWYER, P TORRES, J HUSSEY, T TI COMPARISON OF EXPERIMENTAL RESULTS AND CALCULATED DETECTOR RESPONSES FOR PBFA-II THERMAL SOURCE EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We performed experiments using proton beams to heat foam-filled cylinders on the Particle Beam Fusion Acceleration II. Preliminary analysis of these diagnostic results provides reasonable agreement between prediction and experiment. The diagnostic package allowed us to benchmark target response as well as diagnose driver performance. Soft x-ray images, both time and space resolved, and the results of broadband spectral measurements on bolometers and x-ray diodes provide qualitative agreement with LASNEX predictions of target features such as Au motion and soft x-ray emission profile. The analysis is consistent with a total beam deposition of 40-50 kJ and power depositions of approximately 180 TW/g. Estimates of target motion confirm the ability of the foam to retard wall motion. C1 WSEP,PHILLIPS LAB,KIRTLAND AFB,NM 87117. RP DERZON, M (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5068 EP 5071 DI 10.1063/1.1143494 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300158 ER PT J AU BELL, PM KILKENNY, JD LANDEN, OL HANKS, RL BRADLEY, DK AF BELL, PM KILKENNY, JD LANDEN, OL HANKS, RL BRADLEY, DK TI ELECTRICAL CHARACTERISTICS OF SHORT PULSE GATED MICROCHANNEL PLATE DETECTORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Gating of microchannel plates (MCPs) can produce shutter times of less than 40 ps. This is accomplished with high-fidelity electronic circuitry and short pulse (sub 80 ps) high-amplitude electronic drivers. Measurements have shown that the fidelity of the electrical circuitry is one of the limiting factors in producing shorter x-ray gating. C1 UNIV ROCHESTER,LASER ENERGET LAB,ROCHESTER,NY 14623. RP BELL, PM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 5 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5072 EP 5074 DI 10.1063/1.1143495 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300159 ER PT J AU LANDEN, OL AF LANDEN, OL TI HIGH-RESOLUTION TIME-DIMENSIONAL AND 2-DIMENSIONAL SPACE-RESOLVED X-RAY-IMAGING OF PLASMAS AT NOVA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID STREAK CAMERA; IMPLOSION AB A streaked multiple pinhole camera technique, first used by P. Choi and co-workers [C. Deeney and P. Choi, Rev. Sci. Instrum. 60, 3558 (1989); P. Choi and R. Aliaga, ibid. 61, 2747 (1990)] to record time- and two-dimensional space-resolved soft x-ray images of plasma pinches, has been implemented on laser plasmas at NOVA. The instrument is particularly useful for time-resolved imaging of small sources (< 150 mum in size) such as implosions for which the necessary alignment accuracy is relaxed from less-than-or-equal-to 10 mum for a single pinhole, to 200 mum for a nine-pinhole column. Results at 20 mum, 30-ps resolution are presented for > 2.5-keV imaging, complementing the existing 1-3-keV streaked x-ray microscope capabilities at NOVA. RP LANDEN, OL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 21 TC 18 Z9 18 U1 0 U2 6 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 OCT PY 1992 VL 63 IS 10 BP 5075 EP 5078 DI 10.1063/1.1143496 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300160 ER PT J AU REMINGTON, BA GLENDINNING, SG WALLACE, RJ ROTHMAN, S MORALES, R AF REMINGTON, BA GLENDINNING, SG WALLACE, RJ ROTHMAN, S MORALES, R TI WOLTER X-RAY MICROSCOPE CHARACTERIZATION MEASUREMENTS ON NOVA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We have made in situ measurements of the spatial resolution function for two sectors 22 X magnification Wolter x-ray microscope. Our experimental technique using backlit grid shots on the Nova laser and our method of analysis are described. RP REMINGTON, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 7 TC 16 Z9 16 U1 0 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 5080 EP 5082 DI 10.1063/1.1143498 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300161 ER PT J AU REMINGTON, BA HAMMEL, BA LANDEN, OL PASHA, RA AF REMINGTON, BA HAMMEL, BA LANDEN, OL PASHA, RA TI HIGH-ENERGY X-RAY-IMAGING DIAGNOSTIC ON NOVA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We have developed a diagnostic suitable for high photon energy (approximately 7 keV) time resolved one-dimensional x-ray imaging on Nova. This diagnostic uses a 12 mum wide, 750 mum long imaging slit mounted on a 20 X magnification snout which is coupled to an X-ray streak camera of variable streak speed. The diagnostic fits into retractable manipulators on the ten-beam chamber at Nova. In situ backlit grid experiments using a large-area backlighter give a spatial resolution full width at half-maximum of about 15 mum with high brightness. RP REMINGTON, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 12 Z9 12 U1 1 U2 6 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 OCT PY 1992 VL 63 IS 10 BP 5083 EP 5085 DI 10.1063/1.1143499 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300162 ER PT J AU RESS, D CIARLO, DR STEWART, JE BELL, PM KANIA, DR AF RESS, D CIARLO, DR STEWART, JE BELL, PM KANIA, DR TI A RING CODED-APERTURE MICROSCOPE FOR HIGH-RESOLUTION IMAGING OF HIGH-ENERGY X-RAYS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID LASER AB We use annular apertures to produce coded images of inertial-confinement fusion targets. The images are formed with 4-9-keV x rays; they are unfolded to obtain high-quality estimates of the source spatial distribution. Excellent time-integrated images have been obtained using x-ray film as a detector, and we are working to obtain time-resolved images using a gated microchannel-plate x-ray detector. Preliminary resolution-grid experiments show that the spatial resolution is less-than-or-equal-to 5 mum, and further experiments are planned to confirm a predicted resolution of less-than-or-equal-to 3 mum. We discuss the apertures, x-ray detectors, and image-processing software that forms this novel x-ray microscope. RP RESS, D (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94551, USA. NR 5 TC 6 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5086 EP 5088 DI 10.1063/1.1143500 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300163 ER PT J AU WOOD, KS FELDMAN, U BECKER, PA NEMIROFF, RJ KANIA, DR AF WOOD, KS FELDMAN, U BECKER, PA NEMIROFF, RJ KANIA, DR TI A FOURIER-TRANSFORM MICROSCOPE FOR X-RAY-IMAGING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB This is a progress report on development of a new x-ray imaging system, called a Fourier transform microscope, intended for use with x-ray emitting targets in laser fusion experiments. It is being built by Naval Research Laboratory and Lawrence Livermore National Laboratory. The system works at energies from 3 to 7 keV. We describe the development of the design, which utilizes fine etched grids to extract Fourier amplitudes for the source brightness distribution at selected spatial frequencies. The finest grids in the prototype system will have rib dimensions of 2 mum. The prototype system is expected to achieve position resolution of 4 mum in 3-7 keV. Simulations of the expected imaging performance are presented. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WOOD, KS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5089 EP 5093 DI 10.1063/1.1143501 PN 2 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300164 ER PT J AU SHEPARD, TD KEANE, CJ SUTER, LJ ABDALLAH, J AF SHEPARD, TD KEANE, CJ SUTER, LJ ABDALLAH, J TI SPECTROSCOPIC DIAGNOSIS OF LONG-SCALE-LENGTH EXPLODING-FOIL PLASMA IN THE PRESENCE OF AN INTENSE RADIATION-FIELD SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB An effective technique for measuring the local electron temperature and density of a laser-produced plasma involves analysis of the emission and/or absorption spectrum from an impurity dopant. However, when an intense high-energy radiation field is present the ionization balance, level population, and resulting spectrum produced by the impurity may be significantly perturbed. We are currently using several computer models to study the effects of such a radiation field for experimental conditions that could be obtained using the Nova laser facility, and are concentrating on the behavior of line intensity ratios that are typically used for density and temperature diagnosis. The goal of this work is to determine the feasibility of spectroscopic diagnosis when an intense high-energy radiation field is present. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SHEPARD, TD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5101 EP 5103 DI 10.1063/1.1143451 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300167 ER PT J AU MOLITORIS, JD MORIN, MM PHILLION, DW OSTERHELD, AL STEWART, RE ROTHMAN, SD AF MOLITORIS, JD MORIN, MM PHILLION, DW OSTERHELD, AL STEWART, RE ROTHMAN, SD TI 8-11-KEV X-RAY SOURCES FOR IMAGING AND ABSORPTION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID PLASMA; RADIOGRAPHY AB We have measured the 8-11-keV emission spectra from plasmas produced by impinging 0.53-mum, 100- and 200-ps FWHM Gaussian laser pulses on targets of different materials. The experimental spectra from W and Zn are identified by comparison with local thermodynamic equilibrium plasma emission calculations. C1 ATOM WEAP RES ESTAB,ALDERMASTON,BERKS,ENGLAND. MIT,DEPT MATH,CAMBRIDGE,MA 02139. RP MOLITORIS, JD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5104 EP 5107 DI 10.1063/1.1143452 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300168 ER PT J AU GLENDINNING, SG REMINGTON, BA HAAN, SW MUNRO, DH WEBER, SV AF GLENDINNING, SG REMINGTON, BA HAAN, SW MUNRO, DH WEBER, SV TI ANALYSIS TECHNIQUES FOR DIRECTLY AND INDIRECTLY DRIVEN HYDRODYNAMIC EXPERIMENTS ON NOVA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID RAYLEIGH-TAYLOR INSTABILITY; LASER; FUSION AB Over the past five years we have performed an extensive series of experiments on hydrodynamic (Rayleigh-Taylor) instabilities. Typically such experiments involve the time-resolved radiography of an accelerated foil (planar geometry) with the line-of-sight of the radiograph along the direction of motion. In comparing experimental data to simulations, the simplest approach is to extract the modulation in exposure level of such a radiograph versus time and compare the inferred growth rate (assumed to be exponential) with the growth rate in column density (DELTArhoz) from a simulation. We have found that this gives unsatisfactory results. We will discuss the techniques for experimental analysis and post processing of simulations which we use for a more direct comparison of the data with the simulation, including the extraction of Fourier components versus time from the data, the effect of backlighter spectra, emission from sources other than the backlighter, and the nonlinear effects of instrument response. RP GLENDINNING, SG (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L479,LIVERMORE,CA 94550, USA. NR 10 TC 6 Z9 6 U1 1 U2 4 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 OCT PY 1992 VL 63 IS 10 BP 5108 EP 5110 DI 10.1063/1.1143453 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300169 ER PT J AU COBBLE, JA FULTON, RD JONES, LA KYRALA, GA SCHAPPERT, GT TAYLOR, AJ WAHLIN, EK AF COBBLE, JA FULTON, RD JONES, LA KYRALA, GA SCHAPPERT, GT TAYLOR, AJ WAHLIN, EK TI X-RAY STREAK CAMERA DIAGNOSTICS OF PICOSECOND LASER PLASMA INTERACTIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID PULSES AB An x-ray streak camera is used to diagnose a laser-produced A1 plasma with time resolution of approximately 10 ps. A streak record of filtered emission and a time-integrated transmission grating spectrum reveal that the plasma radiation is dominated by emission from He- and H-like resonance lines. RP COBBLE, JA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 2 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5116 EP 5118 DI 10.1063/1.1143457 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300171 ER PT J AU MANCINI, RC HOOPER, CF DELAMATER, ND HAUER, A KEANE, CJ HAMMEL, BA NASH, JK AF MANCINI, RC HOOPER, CF DELAMATER, ND HAUER, A KEANE, CJ HAMMEL, BA NASH, JK TI DENSITY AND TEMPERATURE DIAGNOSTIC BASED ON THE AR HE BETA LINE AND ASSOCIATED LI-LIKE SATELLITES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID DIELECTRONIC SATELLITES; PLASMAS; IONS; MODEL AB We have modeled the temperature and density dependence of the Li-like satellites of the Ar He beta line by performing NLTE kinetic modeling of level populations in conjunction with Stark broadening calculations. Composite line profiles are computed including resonance and satellite line transitions that have built-in the temperature and density dependence characteristic of the level populations and Stark broadening of these transitions. These synthetic spectra can be used to analyze experimental data, providing a simultaneous diagnostic of temperature and density. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MANCINI, RC (reprint author), UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611, USA. NR 11 TC 36 Z9 36 U1 0 U2 4 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 OCT PY 1992 VL 63 IS 10 BP 5119 EP 5121 DI 10.1063/1.1143458 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300172 ER PT J AU MACGOWAN, BJ KOCH, JA MROWKA, S AF MACGOWAN, BJ KOCH, JA MROWKA, S TI A SIMPLE METHOD FOR OVERCOMING SPATIAL-RESOLUTION LIMITATIONS IN SOFT-X-RAY SPECTROGRAPH DETECTOR SYSTEMS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB We describe a simple method for improving the spectral resolution of so x-ray an ultraviolet spectrographs which use electro-optical detector/intensifiers. In this method, the spectrometer is focused onto a narrow slit which is angled near 90-degrees with respect to the dispersive axis and placed just in front of the detector. Proper choice of the width and angle of the slit is shown to have the effect of expanding the spectrum along the length of the slit to the point where the spatial resolution limitations of the detector are overcome. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP MACGOWAN, BJ (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808,L-476, LIVERMORE, CA 94550 USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5122 EP 5123 DI 10.1063/1.1143459 PN 2 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300173 ER PT J AU ZE, F KAUFFMAN, RL KILKENNY, JD WIELWALD, J BELL, PM HANKS, R STEWART, J DEAN, D BOWER, J WALLACE, R AF ZE, F KAUFFMAN, RL KILKENNY, JD WIELWALD, J BELL, PM HANKS, R STEWART, J DEAN, D BOWER, J WALLACE, R TI A NEW MULTICHANNEL SOFT-X-RAY FRAMING CAMERA FOR FUSION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID MU-M AB Two-dimensional, time resolved x-ray imaging is a principal technique used to study hot plasmas produced in laser heated targets. It can be used to study laser energy deposition within the irradiation spot, the spatial and temporal dependence of laser to X-ray conversion efficiency, electron transport and density profiles, mass ablation rates as well as x-ray driven implosions in inertial confinement fusion experiments. We have successfully developed a new soft x-ray framing camera which will allow us to record two-dimensional images at different times almost simultaneously. It is a broadband diagnostic (100 eV less-than-or-equal-to DELTAhnu less-than-or-equal-to 400 eV) having three channels which can obtain x-ray images at four different times from laser driven targets. Its current configuration includes one 500 eV, one 1.0 keV, and one approximately 2.5 keV channels. The two low energy channels resulted from pairing transmission filters to grazing x-ray mirrors. Other channel options can be implemented easily to measure other x-ray energies. Four different striplines coated on a microchannel plate are gated at different times. Each strip records three different images taken nearly simultaneously, one image per channel. The result is 12 x-ray images on film, four images per channel taken at four different times, with a nominal resolution of approximately 100 ps per image. The diagnostic's spatial resolution is approximately 10 mum. We have already fielded this new instrument during x-ray conversion experiments, using both low and high Z targets driven by 1-2 ns, "flattop" laser pulses. We will show the details of the instrument design and sample results from conversion experiments. RP ZE, F (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 38 Z9 48 U1 1 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 5124 EP 5126 DI 10.1063/1.1143460 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300174 ER PT J AU WROBLEWSKI, D LAO, LL AF WROBLEWSKI, D LAO, LL TI POLARIMETRY OF MOTIONAL STARK-EFFECT AND DETERMINATION OF CURRENT PROFILES IN DIII-D (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID MAGNETIC-FIELD; TOKAMAK AB The motional electric field E = v X B, where upsilon is the velocity and B is the tokamak magnetic field, produces a strong Stark effect in spectral lines emitted by hydrogenic neutral beams. The tilt angle of the magnetic field line, a quantity related directly to the distribution of the plasma toroidal current, is deduced from a measurement of the direction of polarization of the Stark components. In the DIII-D tokamak, the Balmer-alpha line of deuterium emitted by one of the high-power heating beams is analyzed. A multichord polarimeter measures the magnetic field pitch angle at eight spatial locations covering approximately 0.6 of the nominal plasma diameter at the midplane outboard side. The diagnostic offers 2-8-cm resolution in the major radius and 1-ms integration time. The accuracy of the measurement of the polarization direction necessary for an adequate reconstruction of the current profiles is obtained with the use of active polarizing elements which produce high-frequency intensity modulation with an amplitude related to the direction of linear polarization of the plasma radiation. The current profiles in highly shaped (noncircular) plasmas cannot be determined solely from the tilt angle measurements because they do not provide any information about the shape of magnetic surfaces. Thus, the polarization measurements are used in conjunction with a large set of external magnetic measurements (magnetic field and flux probes, diamagnetic loops, and Rogowski coils) by the magnetic field equilibrium code EFIT, and provide a constraint on the possible solutions for the current profile. C1 GEN ATOM CO,SAN DIEGO,CA 92186. RP WROBLEWSKI, D (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 116 Z9 117 U1 2 U2 3 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 OCT PY 1992 VL 63 IS 10 BP 5140 EP 5147 PN 2 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300177 ER PT J AU SPANJERS, GG GALAMBOS, JP BOHNET, MA JARBOE, TR CHRISTIANSEN, WH WURDEN, GA WRIGHT, BL SMITH, RJ AF SPANJERS, GG GALAMBOS, JP BOHNET, MA JARBOE, TR CHRISTIANSEN, WH WURDEN, GA WRIGHT, BL SMITH, RJ TI DEVELOPMENT OF A TRANSIENT INTERNAL PROBE DIAGNOSTIC SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The transient internal probe (TIP) diagnostic is a novel method for probing the interior of hot magnetic fusion plasmas. In the TIP scheme, a probe is fired, using a two-stage light gas gun, through a hot plasma at velocities up to 5 km/s, and makes direct, local measurements of the internal magnetic field structure. The data are relayed to the laboratory optical detection system using an incident laser that is directed through a Faraday rotator payload acting as a magneto-optic sensor. Ablative effects are avoided by minimizing the probe size, limiting the time that the probe is in the hot plasma, and encasing the probe with a diamond cladding. The degree to which the diamond probe cladding is susceptible to ablative effects will determine the plasma density and temperature regime in which the TIP diagnostic can be used. If the TIP suffers significant ablation it is an indication that the diagnostic is not usable on this hot and dense of a plasma (or that greater velocity must be imparted to the probe to further minimize the time that it is in the plasma). A quantitative experimental study of the ablation rates of diamond is planned as part of the TIP development. The integrated TIP system will be functional in 1992 and installed on the Helicity Injected Torus (HIT) [T. R. Jarboe, Fusion Tech. 15, 9 1989) at the University of Washington. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. RP SPANJERS, GG (reprint author), UNIV WASHINGTON,SEATTLE,WA 98195, USA. RI Wurden, Glen/A-1921-2017 OI Wurden, Glen/0000-0003-2991-1484 NR 2 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5148 EP 5150 DI 10.1063/1.1143812 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300178 ER PT J AU DIMONTE, G AF DIMONTE, G TI A MAGNETOOPTIC IMAGING PROBE FOR CONTINUOUS MAGNETIC-FIELD PROFILES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID FARADAY-ROTATION; PLASMAS; FR-5 AB Magnetic field profiles are measured continuously in space and time using Faraday rotation in magneto-optic glass. A line focused laser beam which undergoes Faraday rotation within the glass element is imaged in one dimension through a polarizer and onto a streak camera. The system is described and used to characterize an exploding diamagnetic plasma cavity. RP DIMONTE, G (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5151 EP 5153 DI 10.1063/1.1143464 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300179 ER PT J AU JOBES, FC MANSFIELD, DK AF JOBES, FC MANSFIELD, DK TI MIDPLANE FARADAY-ROTATION - A DENSITOMETER FOR LARGE TOKAMAKS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID ELECTRON-DENSITY AB The density in a large tokamak such as International Thermonuclear Experimental Reactor (ITER), or any of the proposed future US machines, can be determined by measuring the Faraday rotation of a 10.6 mum laser directed tangent to the toroidal field. If there is a horizontal array of such beams, then n(e)(R) can be readily obtained with a simple Abel inversion about the center line of the tokamak. For a large machine, operated at a full field of 30 T m and a density of 2 x 10(20)/m3, the rotation angle would be quite large-about 60-degrees for two passes. A layout in which a single laser beam is fanned out in the horizontal midplane of the tokamak, with a set of retroreflectors on the far side of the vacuum vessel, would provide good spatial resolution, depending only upon the number of reflectors. With this proposed layout, only one window would be needed. Because the rotation angle is never more than 1 "fringe," the data is always good, and it is also a continuous measurement in time. Faraday rotation is dependent only upon the plasma itself, and thus is not sensitive to vibration of the optical components. Simulations of the expected results show that ITER, or any large tokamak, existing or proposed, would be well served even at low densities by a midplane Faraday rotation densitometer of approximately 64 channels. RP JOBES, FC (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ, USA. NR 9 TC 21 Z9 21 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5154 EP 5156 DI 10.1063/1.1143465 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300180 ER PT J AU STRATTON, BC FONCK, RJ KIM, YJ MCKEE, G THORSON, T AF STRATTON, BC FONCK, RJ KIM, YJ MCKEE, G THORSON, T TI ALPHA-CHERS - A SPECTROSCOPIC EXPERIMENT TO DETECT NONTHERMAL ALPHA-PARTICLES ON TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A spectroscopic diagnostic for measurement of slowing-down alpha particles is under development and will be implemented for D-T operation of the Tokamak Fusion Test Reactor. The visible 468.6 nm He+ line (n = 3-4) is excited by charge exchange recombination of alphas with a heating neutral beam (55 keV/amu), and the distortion of the line profile caused by alphas with energies up to 0. 5- 1.0 MeV is observed. Expected intensities are 0. 1%-10% of the bremsstrahlung background for D-T discharges with Q = 0.2-1.0. Because the signal is small, a high-throughput optical system is needed to achieve the desired signal-to-noise ratio of 10-100. Vertical and horizontal arrays of sightlines with five spatial channels will be used. Initially, two spatial channels will be coupled via fiber optics to an f/3.8 spectrometer equipped with a low-noise charge coupled device detector, with expansion to 5-10 spatial channels planned for D-T operation. C1 UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706. RP STRATTON, BC (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 7 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5179 EP 5181 DI 10.1063/1.1143474 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300188 ER PT J AU THORSON, T MCKEE, G FONCK, RJ STRATTON, B AF THORSON, T MCKEE, G FONCK, RJ STRATTON, B TI SPECTROMETER SYSTEM AND DETECTOR TESTS FOR THE TFTR ALPHA-CHERS EXPERIMENT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB An optical spectroscopy diagnostic has been designed to observe emissions from the nonthermal alpha particle population that will be generated during the D-T operation phase on TFTR. The system will observe spectral line emission near 469 nm from the slowing-down alpha population interacting with the heating neutral beams through charge exchange. The required spectrometer throughput and resolution are obtained by modification of a simple commercial spectrometer system, while a series of measurements indicate that a cooled CCD array is usable as a high-efficiency detector with photon-noise-limited accuracy to roughly a part in 10(4). C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP THORSON, T (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706, USA. NR 4 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5182 EP 5184 DI 10.1063/1.1143423 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300189 ER PT J AU TERRY, JL MARMAR, ES SNIPES, JA GARNIER, D SERGEEV, VY AF TERRY, JL MARMAR, ES SNIPES, JA GARNIER, D SERGEEV, VY TI IMAGING OF LITHIUM PELLET ALBLATION TRAILS AND MEASUREMENT OF Q PROFILES IN TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TOKAMAK; FIELD AB Video images with 2 mus exposures of the Li+ emission in Li pellet ablation clouds have been obtained in a variety of Tokamak Fusion Test Reactor tokamak discharges. The pellet clouds are viewed from behind the pellet, which is injected from the outside midplane. In this view, the emission forms an elongated cigar shape with the long dimension of the cigar aligned with the local magnetic field. In some cases, two distinct parallel cigars can be seen simultaneously, displaced vertically from one another by approximately 5 cm. Measurements using a ten channel array of position sensitive photodiodes show that the mean position of the ablation cloud emission can oscillate vertically by approximately 4 cm with periods in the 60-100 mus range, and that these oscillations are highly correlated with "bursts" in the cloud emission. The tilt of the cloud is also measured as a function of time as the pellet traverses the plasma, and in this way the poloidal field profile is obtained. (The total transit time of the pellet is approximately 1 ms.) Magnetohydrodynamic equilibrium reconstructions of q profiles have been determined using these measurements. C1 ST PETERSBURG TECH UNIV,DEPT PLASMA PHYS,ST PETERSBURG 195251,USSR. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP TERRY, JL (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. OI Garnier, Darren/0000-0002-0718-1073 NR 13 TC 14 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5191 EP 5194 DI 10.1063/1.1143849 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300192 ER PT J AU RILEY, RA LOVBERG, RH SHLACHTER, JS SCUDDER, DW AF RILEY, RA LOVBERG, RH SHLACHTER, JS SCUDDER, DW TI OPTICAL DIAGNOSTICS ON DENSE Z-PINCH PLASMAS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A novel "point-diffraction" interferometer has been implemented on the Los Alamos solid fiber Z-pinch experiment. The laser beam is split into two legs after passing through the plasma. The reference leg is filtered with a pin-hole aperture and recombined with the other leg to form an interferogram. This allows compact mounting of the optics and relative ease of alignment. The Z-pinch experiment employs a pulsed-power generator that delivers up to 700 kA with a 100 ns rise time through a fiber of deuterium or deuterated polyethylene (CD2) that is 5-cm long and initially solid with radius r almost-equal-to 15 mum. The interferometer, using a DELTAt almost-equal-to 200 ps pulse from a Nd:YAG laser frequency doubled to lambda = 532 nm, measures the electron line density and, assuming azimuthal symmetry, the density as a function of radial and axial position. Calculations predict Faraday rotations of order pi/2 for plasma and current densities that this experiment was designed to produce. The resulting periodic loss of fringes would provide the current density distribution. RP RILEY, RA (reprint author), LOS ALAMOS NATL LAB,MS E-526,LOS ALAMOS,NM 87545, USA. NR 7 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5202 EP 5204 DI 10.1063/1.1143429 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300195 ER PT J AU GUTTMANN, GD GOMEZ, C FERNANDEZ, J AF GUTTMANN, GD GOMEZ, C FERNANDEZ, J TI DEVELOPMENT OF A HOLOGRAPHIC POLAROINTERFEROMETER TO STUDY LONG-SCALE LENGTH PLASMAS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Holographic polaro-interferometry represents a flexible tool for studying density and magnetic fields in an ICF plasma. The polarization and the changes in beam phase are recorded in a single hologram. Using the polarization information, the magnetic field (i.e., the Faraday rotation) of the plasma can be determined, while the density profile can be inferred from the change in beam phase. The experimental setup uses a Mach-Zender arrangement to form the hologram/interferogram. A single beam is passed through the plasma. This beam is split when entering the Mach-Zender arrangement. The reference beam is passed through a spatial filter to erase phase information generated from the passage through the plasma. This diagnostic is being developed for application to ICF plasmas. It will be tested initially on a long-scale length plasma generated by an explodin wire. An interferogram is presented. RP GUTTMANN, GD (reprint author), LOS ALAMOS NATL LAB,MS E554,LOS ALAMOS,NM 87544, USA. RI Fernandez, Juan/H-3268-2011 OI Fernandez, Juan/0000-0002-1438-1815 NR 9 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5206 EP 5208 DI 10.1063/1.1143431 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300196 ER PT J AU SIKKA, VK BALDWIN, RH AF SIKKA, VK BALDWIN, RH TI CREEP-RUPTURE PROPERTIES OF FE3AL-BASED IRON-ALUMINIDE ALLOYS SO SAMPE QUARTERLY-SOCIETY FOR THE ADVANCEMENT OF MATERIAL AND PROCESS ENGINEERING LA English DT Article AB Creep data for three Fe3Al-based, iron-aluminide alloys (FAS, FAL, and FA-129) were analyzed in detail. The data were developed on three heats of each of the alloys. The heats ranged in sized from a 7 kg laboratory melt to a 2500 kg commercially prepared melt. Creep tests were conducted in air on flat specimens, punched from 0.8 mm thick sheet of each alloy. All of the tests were conducted in the temperature range of 450 to 700-degrees-C. Data were analyzed in terms of Larson-Miller parameter, and a constant of 20 described the creep behavior of all three iron-aluminide alloys. The best fit to the Larson-Miller parameter plots was used to calculate the 10(2), 10(3), 10(4), and 10(5) h rupture and creep strengths. The rupture strength of the three alloys was compared with the published values on types 403 and 304 stainless steels. RP SIKKA, VK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 7 TC 3 Z9 3 U1 1 U2 2 PU SAMPE PUBLISHERS PI COVINA PA 1161 PARKVIEW DRIVE, COVINA, CA 91722 SN 0036-0821 J9 SAMPE QUART PD OCT PY 1992 VL 24 IS 1 BP 2 EP 9 PG 8 WC Engineering, Multidisciplinary; Materials Science, Multidisciplinary SC Engineering; Materials Science GA JT050 UT WOS:A1992JT05000001 ER PT J AU DAVIES, G LIGHTOWLERS, EC ITOH, K HANSEN, WL HALLER, EE OZHOGIN, V AF DAVIES, G LIGHTOWLERS, EC ITOH, K HANSEN, WL HALLER, EE OZHOGIN, V TI ISOTOPE DEPENDENCE OF THE INDIRECT ENERGY-GAP OF GERMANIUM SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Letter ID GE AB No-phonon luminescence from excitons bound to shallow donors and acceptors in crystalline germanium is found to move to higher energy with increasing mass number A of the germanium at the rate dE/dA = 0.35+/-0.02 meV. We show that it is possible to predict this shift, to a good approximation, from the temperature dependence of the energy gap and the effect on the lattice parameter of the different isotopes. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,USSR. RP DAVIES, G (reprint author), UNIV LONDON KINGS COLL,DEPT PHYS,LONDON WC2R 2LS,ENGLAND. RI Itoh, Kohei/C-5738-2014 NR 10 TC 31 Z9 31 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD OCT PY 1992 VL 7 IS 10 BP 1271 EP 1273 DI 10.1088/0268-1242/7/10/010 PG 3 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA JT730 UT WOS:A1992JT73000010 ER PT J AU VOLKOW, ND FOWLER, JS AF VOLKOW, ND FOWLER, JS TI NEUROPSYCHIATRIC DISORDERS - INVESTIGATION OF SCHIZOPHRENIA AND SUBSTANCE-ABUSE SO SEMINARS IN NUCLEAR MEDICINE LA English DT Review ID POSITRON EMISSION TOMOGRAPHY; BRAIN GLUCOSE-METABOLISM; CEREBRAL BLOOD-FLOW; DOPAMINERGIC CHOLINERGIC INTERACTIONS; ACUTE UNTREATED SCHIZOPHRENIA; RECEPTOR OCCUPANCY; BABOON BRAIN; PARKINSONS-DISEASE; BINDING-SITES; COCAINE C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP VOLKOW, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NIDA NIH HHS [R01DA06278-1] NR 96 TC 31 Z9 31 U1 1 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0001-2998 J9 SEMIN NUCL MED JI Semin. Nucl. Med. PD OCT PY 1992 VL 22 IS 4 BP 254 EP 267 DI 10.1016/S0001-2998(05)80120-5 PG 14 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JV837 UT WOS:A1992JV83700005 PM 1439871 ER PT J AU HAWKINS, RA HOH, C GLASPY, J CHOI, Y DAHLBOM, M REGE, S MESSA, C NIETSZCHE, E HOFFMAN, E SEEGER, L MADDAHI, J PHELPS, ME AF HAWKINS, RA HOH, C GLASPY, J CHOI, Y DAHLBOM, M REGE, S MESSA, C NIETSZCHE, E HOFFMAN, E SEEGER, L MADDAHI, J PHELPS, ME TI THE ROLE OF POSITRON EMISSION TOMOGRAPHY IN ONCOLOGY AND OTHER WHOLE-BODY APPLICATIONS SO SEMINARS IN NUCLEAR MEDICINE LA English DT Review ID BLOOD-BRAIN-BARRIER; CEREBRAL GLUCOSE-UTILIZATION; PROTEIN-SYNTHESIS RATES; TO-TUMOR TRANSPORT; N-13 L-GLUTAMATE; BREAST-CANCER; F-18 FLUORODEOXYGLUCOSE; FLOW-CYTOMETRY; METABOLIC-RATE; QUANTITATIVE MEASUREMENT C1 UNIV CALIF LOS ANGELES,SCH MED,US DOE,NUCL MED LAB,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,SCH MED,BIOMED & ENVIRONM SCI LAB,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,SCH MED,CRUMP INST BIOL IMAGING,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,SCH MED,DIV HEMATOL & ONCOL,LOS ANGELES,CA 90024. RP HAWKINS, RA (reprint author), UNIV CALIF LOS ANGELES,SCH MED,DEPT RADIOL SCI,DIV NUCL MED & BIOPHYS,LOS ANGELES,CA 90024, USA. RI Nitzsche, Egbert/A-1243-2011 FU PHS HHS [47682] NR 136 TC 71 Z9 74 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0001-2998 J9 SEMIN NUCL MED JI Semin. Nucl. Med. PD OCT PY 1992 VL 22 IS 4 BP 268 EP 284 DI 10.1016/S0001-2998(05)80121-7 PG 17 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JV837 UT WOS:A1992JV83700006 PM 1439872 ER PT J AU SHROFF, GM BISCHOF, CH AF SHROFF, GM BISCHOF, CH TI ADAPTIVE CONDITION ESTIMATION FOR RANK-ONE UPDATES OF QR FACTORIZATIONS SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE ADAPTIVE CONDITION ESTIMATION; UPDATING; ORTHOGONAL FACTORIZATION AB Many applications involve repeatedly solving linear systems of equations while the coefficient matrix is modified by a rank-one matrix at each iteration. The QR factorization is often used in such situations, and algorithms that update the QR factorizations in O(n2) time are well known. To avoid excessive round-off error in solving equation systems, it is useful to monitor the condition number of the matrix as the iterations progress. In this paper, general (i.e., nonsymmetric) matrices undergoing rank-one changes are considered and an adaptive condition estimation algorithm, "GRACE," is developed to monitor the condition number of the matrices during the update process. The algorithm requires only O(n) overhead beyond the cost of updating the QR factorization. Potential numerical difficulties in the algorithm are analyzed and modifications to overcome these are introduced. These modifications are also applicable to the ACE algorithm of Pierce and Plemmons that handles symmetric updates. Finally, experimental results are presented that demonstrate that GRACE works well in practice. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. RP SHROFF, GM (reprint author), CALTECH,APPL MATH 217-50,PASADENA,CA 91125, USA. RI Bischof, Christian/D-2897-2009 NR 8 TC 6 Z9 6 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD OCT PY 1992 VL 13 IS 4 BP 1264 EP 1278 DI 10.1137/0613077 PG 15 WC Mathematics, Applied SC Mathematics GA JQ329 UT WOS:A1992JQ32900018 ER PT J AU BARLOW, JL VEMULAPATI, UB AF BARLOW, JL VEMULAPATI, UB TI RANK DETECTION METHODS FOR SPARSE MATRICES SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE SPARSE MATRICES; ORTHOGONAL FACTORIZATION; CONDITION ESTIMATION; NUMERICAL RANK ID LEAST-SQUARES PROBLEMS; INCREMENTAL CONDITION ESTIMATION; CONDITION NUMBER; DECOMPOSITION; ALGORITHM; SET AB A method is proposed for estimating the numerical rank of a sparse matrix. The method uses orthogonal factorization along with a one-norm incremental condition estimator that is an adaptation of the LINPACK estimator. This approach allows the use of static storage allocation as is used in SPARSPAK-B, whereas there is no known way to implement column pivoting without dynamic storage allocation. It is shown here that this approach is probably more accurate than the method presently used by SPARSPAK-B. The method is implemented with an overhead of O(n(U) log n) operations, where n(U) is the number of nonzeros in the upper triangular factor of the matrix. In theory, it can be implemented in O(max{n(U), n log n}) operations, but this requires the use of a complicated data structure. It is shown how a variant of this strategy may be implemented on a message-passing architecture. A prototype implementation is done and tests show that the method is accurate and efficient. Ways in which the condition estimator and the rank detection method can be used are also discussed, along with the rank-revealing orthogonal factorizations of Foster [Linear Algebra Appl., 74 (1986), pp. 47-72] and Chan [Linear Algebra Appl., 88/89 (1987), pp. 67-82]. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV CENT FLORIDA,DEPT COMP SCI,ORLANDO,FL 32816. RP BARLOW, JL (reprint author), PENN STATE UNIV,DEPT COMP SCI,UNIV PK,PA 16802, USA. NR 38 TC 8 Z9 8 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD OCT PY 1992 VL 13 IS 4 BP 1279 EP 1297 DI 10.1137/0613078 PG 19 WC Mathematics, Applied SC Mathematics GA JQ329 UT WOS:A1992JQ32900019 ER PT J AU MANTEUFFEL, TA WHITE, AB AF MANTEUFFEL, TA WHITE, AB TI A CALCULUS OF DIFFERENCE-SCHEMES FOR THE SOLUTION OF BOUNDARY-VALUE-PROBLEMS ON IRREGULAR MESHES SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE SUPRACONVERGENCE; DIFFERENCE SCHEMES; ODES; IRREGULAR MESHES ID NUMERICAL-SOLUTION; SYSTEMS AB This paper derives compact-as-possible difference schemes for the solution of high-order two-point boundary-value problems on irregular meshes. This is accomplished by first writing the high-order equation as a first-order system of equations, discretizing and then algebraically reducing the discrete system to a compact-as-possible difference scheme for the original high-order equation. The reduced scheme inherits the properties of the discrete first-order system. In particular, if the first-order system represents a centered Euler scheme, then the reduced scheme will be second-order accurate despite possibly inconsistent truncation error. This phenomenon is known as supraconvergence. C1 LOS ALAMOS NATL LAB,DIV COMP & COMMUN,LOS ALAMOS,NM 87545. RP MANTEUFFEL, TA (reprint author), UNIV COLORADO,COMPUTAT MATH GRP,DENVER,CO 80204, USA. NR 9 TC 7 Z9 7 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD OCT PY 1992 VL 29 IS 5 BP 1321 EP 1346 DI 10.1137/0729077 PG 26 WC Mathematics, Applied SC Mathematics GA JQ327 UT WOS:A1992JQ32700005 ER PT J AU SOJKA, RE LUXMOORE, RJ AF SOJKA, RE LUXMOORE, RJ TI THE CAREER AND ACHIEVEMENTS OF PROFESSOR STOLEY,LEWIS,H SO SOIL SCIENCE LA English DT Item About an Individual AB The collection of papers in this issue of Soil Science, presented by arrangement with the Soil Science Society of America, Crop Science Society of America, and American Society of Agronomy, honors the career and achievements of Professor Lewis H. Stolzy. The papers were presented in a special symposium at the Annual Meetings of the Tri-Societies held in Denver, Colorado in October 1991 to review recent research developments in plant responses to the soil physical environment. This topic is the focus of Professor Stolzy's research and teaching career. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP SOJKA, RE (reprint author), USDA ARS,SOIL & WATER MANAGEMENT RES,KIMBERLY,ID, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0038-075X J9 SOIL SCI JI Soil Sci. PD OCT PY 1992 VL 154 IS 4 BP 257 EP 258 DI 10.1097/00010694-199210000-00001 PG 2 WC Soil Science SC Agriculture GA JV541 UT WOS:A1992JV54100001 ER PT J AU SHEN, YR AF SHEN, YR TI SURFACE NONLINEAR OPTICAL SPECTROSCOPY SO SOLID STATE COMMUNICATIONS LA English DT Article ID VIBRATIONAL-ENERGY RELAXATION; SUM-FREQUENCY GENERATION; METAL-SURFACE; 2ND-HARMONIC GENERATION; ELECTRONIC-TRANSITIONS; METHYL THIOLATE; MONOLAYERS; INTERFACE; ADSORBATE; AG(111) AB One of Professor Eli Burstein's latest research interests is briefly reviewed and discussed. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP SHEN, YR (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 22 TC 4 Z9 4 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD OCT PY 1992 VL 84 IS 1-2 BP 171 EP 172 DI 10.1016/0038-1098(92)90318-4 PG 2 WC Physics, Condensed Matter SC Physics GA JT059 UT WOS:A1992JT05900038 ER PT J AU CHEN, G STUMP, NA HAIRE, RG PETERSON, JR ABRAHAM, MM AF CHEN, G STUMP, NA HAIRE, RG PETERSON, JR ABRAHAM, MM TI PRESSURE-INDUCED PHASE-TRANSITION IN YVO4-EU-3+ - AN EMISSION LIFETIME STUDY AT HIGH-PRESSURE SO SOLID STATE COMMUNICATIONS LA English DT Article AB The dependence of the lifetime of the 5D0 level in the Eu3+ ion doped into YVO4 (denoted YVO4:Eu3+) has been investigated as a function of pressure up to about 11 GPa, using a diamond anvil cell. An abrupt change in the lifetime of the Eu3+ ion luminescence at 6.2 GPa, which after release of pressure did not change significantly, indicated that a pressure-induced, irreversible phase transition had occurred. This result suggests that luminescence lifetime data can be used to identify phase transitions, and is particularly important when the luminescence spectra cannot differentiate between the site symmetries of the Eu3+ ion in the two crystal structures involved, such as the case for YVO4:Eu3+. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CHEN, G (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 10 TC 17 Z9 17 U1 0 U2 5 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 OCT PY 1992 VL 84 IS 3 BP 313 EP 315 DI 10.1016/0038-1098(92)90128-V PG 3 WC Physics, Condensed Matter SC Physics GA JV158 UT WOS:A1992JV15800012 ER PT J AU YUNG, KC WAHLSTRAND, KJ YEE, JH MARIELLA, RP AF YUNG, KC WAHLSTRAND, KJ YEE, JH MARIELLA, RP TI THEORETICAL INVESTIGATION OF THE LASING CHARACTERISTICS OF SEVERAL GRIN SCH QUANTUM-WELL LASERS SO SOLID-STATE ELECTRONICS LA English DT Article ID THRESHOLD CURRENT; LENGTH DEPENDENCE; DIODE-LASERS; GAIN; WIDTH AB The investigation of the gains and threshold currents is carried out for several quantum well lasers of differing potential well shape. The theoretical threshold current density as a function of laser cavity length compares very well with the result obtained from experiments. The gain and photon density as a function of time are reported for several GRIN-SCH potentials of differing shape. The gain of multiple quantum well potentials shows a narrower spectrum than single quantum well potentials. The oscillation frequency of a laser when it is excited by short current pulse is linear with the square root of the power, in agreement with experiments. RP YUNG, KC (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV ENGN RES,LIVERMORE,CA 94550, USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD OCT PY 1992 VL 35 IS 10 BP 1409 EP 1415 DI 10.1016/0038-1101(92)90075-N PG 7 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA JP719 UT WOS:A1992JP71900005 ER PT J AU BLANCHARD, DL BAER, DR AF BLANCHARD, DL BAER, DR TI THE INTERACTIONS OF CO, MN AND WATER WITH CALCITE SURFACES SO SURFACE SCIENCE LA English DT Article ID X-RAY PHOTOELECTRON; SORPTION; ADSORPTION; PRECIPITATION; SPECTROSCOPY; KINETICS; SPECTRA; METALS; COBALT; OXIDES AB The interactions of Co, Mn and water with surfaces of single crystal calcite (CaCO3) have been examined using surface analysis techniques (primarily X-ray photoelectron spectroscopy, XPS) and a specimen transfer system. The metals were deposited on the calcite by evaporation to give submonolayer concentrations. For coverages of Co as low as 0.16 ML, the metal clearly appears in both metallic and oxidized states. Immersion in deionized water completely converts all Co to a compound most consistent with the hydroxide. As previously observed for Mn, some of the Co is removed from the surface during immersion. The rate of removal of Co is two times faster than that of Mn. Further, these rates are about three orders of magnitude slower than that reported for the dissolution of bare calcite. Recently reported solution experiments suggest that Mn cations are adsorbed substitutionally from aqueous solution while most other metals, including Co, are adsorbed in a hydrated form. The significance of our results in light of the conclusions of these solution experiments is discussed. RP BLANCHARD, DL (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Baer, Donald/J-6191-2013 OI Baer, Donald/0000-0003-0875-5961 NR 38 TC 26 Z9 26 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1992 VL 276 IS 1-3 BP 27 EP 39 DI 10.1016/0039-6028(92)90692-Y PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JQ016 UT WOS:A1992JQ01600010 ER PT J AU DONOVAN, RJ JIANG, LQ STRONGIN, M FISCHER, DA AF DONOVAN, RJ JIANG, LQ STRONGIN, M FISCHER, DA TI DEUTERATION OF PROPYLENE OVER PALLADIUM OVERLAYERS ON TANTALUM SO SURFACE SCIENCE LA English DT Article ID ELECTRONIC-STRUCTURE; PD; KINETICS; NB(110); CO AB The deuteration of propylene over Pd-covered Ta surfaces was studied by mass spectroscopy. The largest reaction rate for the formation of C3D8 and C3D7H occurred at coverages slightly greater than 0.5 monolayers and also at somewhat greater than 1 monolayer. The increase in formation Of C3D8 and C3D7H at fractional coverages was expected. However, in this work we find in addition a minimum in the reaction at one monolayer. We argue that this result demonstrates conclusively the dramatic effect of electronic structure on surface reactivity for the Pd-covered Ta surface. C1 SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794. NATL INST STAND & TECHNOL,MAT SCI & ENGN LAB,GAITHERSBURG,MD 20899. RP DONOVAN, RJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. 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 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1992 VL 276 IS 1-3 BP 95 EP 98 DI 10.1016/0039-6028(92)90698-6 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JQ016 UT WOS:A1992JQ01600016 ER PT J AU RICE, BM MURTHY, CS GARRETT, BC AF RICE, BM MURTHY, CS GARRETT, BC TI EFFECTS OF SURFACE-STRUCTURE AND OF EMBEDDED-ATOM PAIR FUNCTIONALS ON ADATOM DIFFUSION ON FCC METALLIC SURFACES SO SURFACE SCIENCE LA English DT Article ID TRANSITION-STATE THEORY; SELF-DIFFUSION; INTERATOMIC INTERACTIONS; EXCHANGE MECHANISM; SINGLE ADATOMS; HYDROGEN; COPPER; MIGRATION; DEFECTS; MOTIONS AB Rates of self-diffusion on the (100) and (110) surfaces of nickel have been calculated using variational transition state theory (VTST) and four different interatomic potential energy functions based on the embedded-atom method (EAM). Static properties of a single nickel atom on the (111) surface, as well as on the (100) and (110) surfaces, are also presented. The embedded-atom pair functionals consist of effective pairwise additive and many-body cohesive interactions parameterized to the bulk and a few defect properties of nickel. VTST calculations of surface diffusion provide Arrhenius parameters and diffusion coefficients for comparison with experiment and among the four EAM potentials employed. An analysis of the estimated diffusion rates based on a hopping mechanism and the four pair functionals reveals that diffusion will occur more readily on the (111) surface and that self-diffusion on the (110) surface exhibits directional anisotropy. The diffusion rate variation from one pair functional to another is interpreted in terms of the effective pair potentials. C1 IBM CORP, E FISHKILL FACIL, CTR SEMICOND RES & DEV, DEPT THEORET MODELING, HOPEWELL JCT, NY 12533 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP RICE, BM (reprint author), USA, BALLIST RES LABS, SLCBR IB I, ABERDEEN PROVING GROUND, MD 21005 USA. RI Garrett, Bruce/F-8516-2011 NR 41 TC 6 Z9 6 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 OCT 1 PY 1992 VL 276 IS 1-3 BP 226 EP 240 DI 10.1016/0039-6028(92)90711-E PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JQ016 UT WOS:A1992JQ01600029 ER PT J AU KU, YS OVERBURY, SH AF KU, YS OVERBURY, SH TI STRUCTURE-ANALYSIS OF S-ADSORBED ON NI(111) BY LOW-ENERGY LI+ ION-SCATTERING SO SURFACE SCIENCE LA English DT Article ID SULFUR ADSORPTION; LEED ANALYSIS; LOW COVERAGE; 111 SURFACE; CHEMISORPTION; NICKEL; 3)R30-DEGREES-S; OVERLAYERS; GEOMETRY; PD(111) AB Low energy ion scattering of Li+ ions with 500 eV energy was applied to analyze the surface structure of S on Ni(111). Polar and azimuthal incident angle dependences were measured for the clean and S covered surface, and the surface geometry was analyzed by the shadowing and blocking features from the single scattering. AES/LEED are used to monitor the surface coverage before and after annealing. The p(2 x 2) and (5 square-root 3 x 2) LEED patterns were observed for S/Ni(111) annealed 6.00 K surface with coverage about 0.25 and 0.40 ML, respectively. The ion scattering data suggested that S atoms were sitting on the fcc hollow site as an overlayer about 0.168 +/- 0.007 nm above the Ni surface for p(2 x 2)S structure. Results for (5 square-root 3 x 2) S/Ni(111) indicate S is present as an overlayer on a reconstructed Ni surface. C1 NATL TSING HUA UNIV,HSINCHU 300,TAIWAN. RP KU, YS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 34 TC 33 Z9 33 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 OCT 1 PY 1992 VL 276 IS 1-3 BP 262 EP 272 DI 10.1016/0039-6028(92)90714-H PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JQ016 UT WOS:A1992JQ01600032 ER PT J AU DRESSEL, M ELDRIDGE, JE WANG, HH GEISER, U WILLIAMS, JM AF DRESSEL, M ELDRIDGE, JE WANG, HH GEISER, U WILLIAMS, JM TI ANALYSIS OF THE INFRARED CONDUCTIVITY OF THE ORGANIC SUPERCONDUCTOR ALPHA-(BEDT-TTF)2(NH4)HG(NCS)4 SO SYNTHETIC METALS LA English DT Article ID AMBIENT-PRESSURE; BEDT-TTF; OPTICAL-PROPERTIES; MERCURY(II) THIOCYANATE; ELECTRICAL-PROPERTIES; REFLECTANCE SPECTRUM; CRYSTAL-STRUCTURES; (BEDT-TTF)2I3; BETA-(BEDT-TTF)2I3; TEMPERATURE AB An optical study of the a phase superconducting compound, alpha-(ET)2(NH4)Hg(NCS)4, has been performed. The absolute reflectivity of a deuterated crystal has been measured as a function of temperature and polarization, from which the conductivity was obtained. The overall shapes of these spectra are discussed and compared with those obtained from compounds of different phases. In particular we were able to perform a Drude fit of the low-temperature conductivity for one polarization, rather than of the reflectivity dip. The plasma frequency and damping were extracted and these yielded a reasonable effective mass and mean free path. The isotopic vibrational frequency shifts were obtained by repeating the measurements on a protonated sample, which was, however, too small to provide absolute data. The vibrational features are assigned and discussed. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DRESSEL, M (reprint author), UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1W5,BC,CANADA. RI Dressel, Martin/D-3244-2012 NR 35 TC 12 Z9 12 U1 0 U2 1 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 OCT 1 PY 1992 VL 52 IS 2 BP 201 EP 211 DI 10.1016/0379-6779(92)90308-6 PG 11 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JX431 UT WOS:A1992JX43100007 ER PT J AU HACKER, BC AF HACKER, BC TI SOLDIERS AND SCHOLARS - THE UNITED-STATES-ARMY AND THE USES OF MILITARY HISTORY, 1865-1920 - REARDON,C SO TECHNOLOGY AND CULTURE LA English DT Book Review RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD OCT PY 1992 VL 33 IS 4 BP 832 EP 833 DI 10.2307/3106614 PG 2 WC History & Philosophy Of Science SC History & Philosophy of Science GA JY490 UT WOS:A1992JY49000030 ER PT J AU SIKOV, MR AF SIKOV, MR TI REPORT OF A WORKSHOP (PNL-8009) - EFFECTS OF LOW-DOSE PRENATAL IRRADIATION ON THE CENTRAL-NERVOUS-SYSTEM - HELD AT BATTELLE-SEATTLE-RESEARCH-CENTER, SEATTLE, WASHINGTON SO TERATOLOGY LA English DT Editorial Material RP SIKOV, MR (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 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 0040-3709 J9 TERATOLOGY JI Teratology PD OCT PY 1992 VL 46 IS 4 BP 408 EP 408 PG 1 WC Developmental Biology; Toxicology SC Developmental Biology; Toxicology GA JP011 UT WOS:A1992JP01100010 ER PT J AU SHEPARD, R AF SHEPARD, R TI ON THE GLOBAL CONVERGENCE OF MCSCF WAVE-FUNCTION OPTIMIZATION - THE METHOD OF TRIGONOMETRIC INTERPOLATION SO THEORETICA CHIMICA ACTA LA English DT Article DE MCSCF; OPTIMIZATION; CONVERGENCE; NONLINEAR; INTERPOLATION; GLOBAL ID GENERALIZED BRILLOUIN THEOREM; HARTREE-FOCK PROCEDURES; EXCITED-STATES; ORBITALS AB A new method of MCSCF wave function optimization is presented. This method is based on a nonlinear transformation of the wave function variation coordinates along with the construction of a global interpolating function. This interpolating function is constructed for each MCSCF iteration in such a way that it reproduces certain known behavior of the exact energy function. It reproduces exactly the energy, gradient, and hessian at the expansion point. at an infinite number of isolated points, and at points on the surfaces of an infinite number of nested multidimensional balls within the wave function variational space. The optimization of the wave function correction parameters on this interpolating function does not require integral transformations or density matrix constructions, although one-index transformation and transition density matrix techniques may be used if desired. The nonlinear coordinate transformations, along with the necessary derivatives, are computed with simple matrix operations, and require only O(N3orb) effort. The new method differs from previous optimization methods in several respects. (1) It reproduces certain behavior of the exact energy function that is not displayed by previous approaches. (2) The orbital-state coupling is included explicitly via the partitioned orbital hessian matrix. (3) The minimization of the approximate energy function is simpler than with previous similar approaches. (4) The treatment of redundant orbital rotations is straightforward, since the exact and approximate energy functions display the same qualitative behavior with respect to these wave function variations. (5) Finally, the present method may be implemented as a simple extension to essentially any existing second-order MCSCF code, the required changes being localized within a rather small part of the overall iterative procedure. Examples of the convergence of the new method are presented. along with numerical demonstrations of some of the relevant features of the exact and interpolated energy functions. RP SHEPARD, R (reprint author), ARGONNE NATL LAB, DIV CHEM, THEORET CHEM GRP, ARGONNE, IL 60439 USA. NR 36 TC 6 Z9 6 U1 1 U2 4 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 OCT PY 1992 VL 84 IS 1-2 BP 55 EP 83 DI 10.1007/BF01117403 PG 29 WC Chemistry, Physical SC Chemistry GA JV173 UT WOS:A1992JV17300004 ER PT J AU GIBSON, JK HAIRE, RG AF GIBSON, JK HAIRE, RG TI HIGH-TEMPERATURE DTA OF TRANSURANIUM MATERIALS WITH APPLICATION TO THE NP-ZR PHASE-DIAGRAM SO THERMOCHIMICA ACTA LA English DT Article AB A high-temperature thermal analysis system has been developed for the study of highly radioactive and scarce transuranium materials. Modifications to a commercial instrument (Perkin-Elmer DTA-1700) for installation and operation in an argon-atmosphere, radioactive-containment glove box are described. The argon atmosphere permitted the handling of air-sensitive and moisture-sensitive samples (e.g. metals), and initial studies have been made on the phase relations in selected actinide alloy systems. Procedures for preparing and studying alloys are described, and preliminary results obtained from our exploratory DTA studies of the Np-Zr alloy system are presented and discussed. RP GIBSON, JK (reprint author), OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM LAB,BLDG 5505,MS-6375,POB 2008,OAK RIDGE,TN 37831, USA. NR 10 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD OCT 1 PY 1992 VL 207 BP 65 EP 78 DI 10.1016/0040-6031(92)80124-F PG 14 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA JR394 UT WOS:A1992JR39400008 ER PT J AU EVANS, RW AF EVANS, RW TI NEED, DEMAND, AND SUPPLY IN ORGAN-TRANSPLANTATION SO TRANSPLANTATION PROCEEDINGS LA English DT Article ID MARGINAL DONORS; DONATION; PROCUREMENT C1 BATTELLE SEATTLE RES CTR,HLTH & POPULAT RES CTR,SEATTLE,WA. NR 17 TC 19 Z9 19 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0041-1345 J9 TRANSPLANT P JI Transplant. Proc. PD OCT PY 1992 VL 24 IS 5 BP 2152 EP 2154 PG 3 WC Immunology; Surgery; Transplantation SC Immunology; Surgery; Transplantation GA JU180 UT WOS:A1992JU18000250 PM 1413015 ER PT J AU RATHI, AK AF RATHI, AK TI THE USE OF COMMON RANDOM NUMBERS TO REDUCE THE VARIANCE IN NETWORK SIMULATION OF TRAFFIC SO TRANSPORTATION RESEARCH PART B-METHODOLOGICAL LA English DT Article AB Computer simulation is now used routinely as a decision support tool in many facets of transportation engineering. Simulation models are often used to compare system alternatives, i.e. alternative system designs and/or operating policies. The presence of high variance of the simulation output variables is a critical problem in such comparative analyses because the models must either be run longer or executed several times to achieve reasonably accurate point and interval estimates of the parameters of interest. The high variability in output measures can also lead to concern about the validity of the model when they are used by the practitioners who are not intimately familiar with the stochastic nature of the model processes. This paper describes and illustrates the effectiveness of variance reduction based on the concept of common random numbers (CRN) for the TRAF-NETSIM simulation model. RP RATHI, AK (reprint author), OAK RIDGE NATL LAB,CTR TRANSPORTAT ANAL,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 12 TC 3 Z9 3 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0191-2615 J9 TRANSPORT RES B-METH JI Transp. Res. Pt. B-Methodol. PD OCT PY 1992 VL 26 IS 5 BP 357 EP 363 DI 10.1016/0191-2615(92)90031-Q PG 7 WC Economics; Engineering, Civil; Operations Research & Management Science; Transportation; Transportation Science & Technology SC Business & Economics; Engineering; Operations Research & Management Science; Transportation GA JT092 UT WOS:A1992JT09200002 ER PT J AU GLAESER, RM AF GLAESER, RM TI SPECIMEN FLATNESS OF THIN CRYSTALLINE ARRAYS - INFLUENCE OF THE SUBSTRATE SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT WORKSHOP ON QUANTITATIVE ELECTRON MICROSCOPY CY DEC, 1991 CL SCHLOSS RINGBERG, TEGERNSEE, GERMANY SP MAX PLANCK SOC HO SCHLOSS RINGBERG ID RESOLUTION ELECTRON-DIFFRACTION; BIOLOGICAL MACROMOLECULES; MICROSCOPY; CRYSTALLOGRAPHY; FORCES; ELASTICITY; MEMBRANES; HYDRATION AB The extreme degree of specimen flatness (i.e. planarity) required for high-resolution electron diffraction and electron microscopy at high tilt angles cannot be realized with thin, sheet-like crystals of biological macromolecules, just on the basis of the intrinsic stiffness of the specimen itself. In an effort to improve the rate of success at which suitably flat specimens are prepared, this paper analyzes several different factors that can either limit or enhance the specimen flatness. If specimens are adsorbed (by attractive forces) to a support film, such as evaporated carbon, which itself is not flat to atomic dimensions, quantitative calculations show that it is quite likely that the specimen will be too wrinkled to be used for high-resolution studies. Adsorption to an air-water interface is more likely to result in the necessary degree of flatness. Repulsive interactions, which might be used to "sandwich" a specimen between two interfaces, are estimated to be too "soft", i.e. too long-range in character, to be effective. Finally, if only one edge of a specimen sticks firmly to a substrate, then surface tension forces can pull the specimen taut over the surface of the substrate, so that the the specimen itself can be more flat than the surface of the substrate upon which it is deposited. A second, important consideration in many studies is the fact that cooling the specimen to low temperature can result in specimen wrinkling, because of the fact that the biological crystal has a much larger coefficient of thermal expansion than that of the evaporated carbon film. In this case one expects that cooling-induced wrinkling might be reduced by using a metal support grid which has a smaller thermal coefficient than that of the carbon film. The validity of this qualitative idea is supported by experiments which show that cooling-induced wrinkling of glucose-embedded purple membrane can be prevented if molybdenum grids are used rather than copper. C1 LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. RP GLAESER, RM (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,STANLEY DONNER ASU,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [GM36884] NR 28 TC 25 Z9 25 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD OCT PY 1992 VL 46 IS 1-4 BP 33 EP 43 DI 10.1016/0304-3991(92)90006-6 PG 11 WC Microscopy SC Microscopy GA JZ064 UT WOS:A1992JZ06400005 PM 1481276 ER PT J AU JAP, BK ZULAUF, M SCHEYBANI, T HEFTI, A BAUMEISTER, W AEBI, U ENGEL, A AF JAP, BK ZULAUF, M SCHEYBANI, T HEFTI, A BAUMEISTER, W AEBI, U ENGEL, A TI 2D CRYSTALLIZATION - FROM ART TO SCIENCE SO ULTRAMICROSCOPY LA English DT Article ID TWO-DIMENSIONAL CRYSTALS; AIR-WATER-INTERFACE; RNA POLYMERASE-II; TOXIN B-SUBUNIT; CRYO-ELECTRON MICROSCOPY; CHLOROPHYLL A/B-PROTEIN; TOBACCO MOSAIC-VIRUS; ZINC-INDUCED SHEETS; 3-DIMENSIONAL STRUCTURE; 2-DIMENSIONAL CRYSTALS AB The techniques as well as the principles of the 2D crystallization of membrane and water-soluble proteins for electron crystallography are reviewed, First, the biophysics of the interactions between proteins, lipids and detergents is surveyed. Second, crystallization of membrane proteins in situ and by reconstitution methods is discussed, and the various factors involved are addressed. Third, we elaborate on the 2D crystallization of water-soluble proteins, both in solution and at interfaces, such as lipid monolayers, mica, carbon film or mercury surfaces. Finally, techniques and instrumentations that are required for 2D crystallization are described. C1 F HOFFMANN LA ROCHE & CO LTD, PHARMA RES NEW TECHNOL, CH-4002 BASEL, SWITZERLAND. MAX PLANCK INST BIOCHEM, DEPT STRUCT BIOL, W-8033 MARTINSRIED, GERMANY. UNIV BASEL, BIOCTR, ME MULLER INST HIGH RESOLUT ELECTRON MICROSCOPY, CH-4056 BASEL, SWITZERLAND. RP LAWRENCE BERKELEY LAB, DIV CELL & MOLEC BIOL, BERKELEY, CA 94720 USA. FU NIGMS NIH HHS [GM36884] NR 221 TC 247 Z9 248 U1 1 U2 23 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 EI 1879-2723 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD OCT PY 1992 VL 46 IS 1-4 BP 45 EP 84 DI 10.1016/0304-3991(92)90007-7 PG 40 WC Microscopy SC Microscopy GA JZ064 UT WOS:A1992JZ06400006 PM 1481277 ER PT J AU HAINFELD, JF AF HAINFELD, JF TI SITE-SPECIFIC CLUSTER LABELS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT WORKSHOP ON QUANTITATIVE ELECTRON MICROSCOPY CY DEC, 1991 CL SCHLOSS RINGBERG, TEGERNSEE, GERMANY SP MAX PLANCK SOC HO SCHLOSS RINGBERG ID TRANSMISSION ELECTRON-MICROSCOPY; INDIVIDUALLY DISTINGUISHABLE LABELS; CYCLOPENTADIENYLTITANIUM HETEROPOLYTUNGSTATE ANIONS; FUNCTIONALIZED KEGGIN-TYPE; UNDECAGOLD CLUSTER; HIGH-RESOLUTION; HEAVY-ATOMS; COLLOIDAL GOLD; BINDING-SITE; LOCALIZATION AB This article discusses the development and use of various heavy-atom clusters (Hg4, Ir4, W11 Au11, 1.4 nm Au) that can be covalently attached to specific groups (e.g., -SH, -NH2, -COOH) on biomolecules to produce high-resolution labels visible in the electron microscope. A number of applications are given, including labeling of proteins, carbohydrates, lipids in membranes and nucleic acids. Improved immunolabeling with clusters over colloidal gold probes is discussed as well as the expanded utility of some of these clusters in TEM thin sections. With silver enhancement, the 1.4 nm gold cluster provides one of the most sensitive probes known for use in EM, light and confocal microscopy and in immunoblotting. RP HAINFELD, JF (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 70 TC 10 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD OCT PY 1992 VL 46 IS 1-4 BP 135 EP 144 DI 10.1016/0304-3991(92)90010-H PG 10 WC Microscopy SC Microscopy GA JZ064 UT WOS:A1992JZ06400009 ER PT J AU DOWNING, KH KOSTER, AJ TYPKE, D AF DOWNING, KH KOSTER, AJ TYPKE, D TI OVERVIEW OF COMPUTER-AIDED ELECTRON-MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT WORKSHOP ON QUANTITATIVE ELECTRON MICROSCOPY CY DEC, 1991 CL SCHLOSS RINGBERG, TEGERNSEE, GERMANY SP MAX PLANCK SOC HO SCHLOSS RINGBERG AB We present a brief overview of the current state and potential applications of computer control of electron microscopes and direct, digital imaging. Control is implemented by attaching an external computer that either directly controls the microscope or communicates with an internal microprocessor control. Direct digital image readout provides information that can be used by the control computer. We discuss several implementations of such control systems, their technical limitations, and directions for future work. C1 UNIV CALIF SAN FRANCISCO,HOWARD HUGHES MED INST,DEPT BIOCHEM & BIOPHYS,SAN FRANCISCO,CA 94143. MAX PLANCK INST BIOCHEM,W-8033 MARTINSRIED,GERMANY. RP DOWNING, KH (reprint author), LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720, USA. NR 12 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD OCT PY 1992 VL 46 IS 1-4 BP 189 EP 197 DI 10.1016/0304-3991(92)90014-B PG 9 WC Microscopy SC Microscopy GA JZ064 UT WOS:A1992JZ06400013 ER PT J AU DOWNING, KH AF DOWNING, KH TI AUTOMATIC FOCUS CORRECTION FOR SPOT-SCAN IMAGING OF TILTED SPECIMENS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT WORKSHOP ON QUANTITATIVE ELECTRON MICROSCOPY CY DEC, 1991 CL SCHLOSS RINGBERG, TEGERNSEE, GERMANY SP MAX PLANCK SOC HO SCHLOSS RINGBERG ID ELECTRON-MICROGRAPHS; SENSITIVE SPECIMENS; BEAM; RESOLUTION; CONTRAST; IMAGES AB The variation in defocus within an image of a highly tilted specimen can be a serious source of artifact. Spot-scan imaging can be combined with dynamic focusing to greatly reduce this range of defocus. A protocol is described for determining the parameters required for the automatic focus compensation during the recording of a spot-scan image. Images of a gold test specimen demonstrate the efficacy of this procedure in extending the area of the image that contains high-quality data. In case the tilt angle or resolution is high enough that the height difference of the specimen within each small illuminated area is larger than the depth of field, the image must be treated to compensate for the focus variation. The same principle is used as was developed for compensation of conventional images of tilted specimens. RP DOWNING, KH (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [GM 36884] NR 15 TC 18 Z9 18 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD OCT PY 1992 VL 46 IS 1-4 BP 199 EP 206 DI 10.1016/0304-3991(92)90015-C PG 8 WC Microscopy SC Microscopy GA JZ064 UT WOS:A1992JZ06400014 PM 1481271 ER PT J AU CHANG, SY LIAW, SL RAILSBACK, SF SALE, MJ AF CHANG, SY LIAW, SL RAILSBACK, SF SALE, MJ TI MODELING ALTERNATIVES FOR BASIN-LEVEL HYDROPOWER DEVELOPMENT .1. OPTIMIZATION METHODS AND APPLICATIONS SO WATER RESOURCES RESEARCH LA English DT Article ID WATER-QUALITY MANAGEMENT; SYSTEMS AB Development of multiple hydroelectric projects at navigation dams on large river systems can result in a number of environmental impacts, including potential reductions in dissolved oxygen (DO) concentrations. This study presents a method for generating hydropower development alternatives for evaluation by planners by quantifying the trade-offs between water quality and power generation. This method employs a Streeter-Phelps model to simulate DO and the bounded implicit enumeration algorithm to solve an optimization model formulated to maximize hydroelectric energy production. A portion of the upper Ohio River basin was selected to illustrate the methodology. The results indicate that various alternatives that meet the specified DO constraints can be generated efficiently. These alternatives are nearly optimal solutions with respect to the modeled objectives but are different with respect to decision variables. C1 TAMKANG UNIV,DEPT CIVIL ENGN,TAMSUI 25137,TAIWAN. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37830. RP CHANG, SY (reprint author), N CAROLINA AGR & TECHNOL STATE UNIV,DEPT CIVIL ENGN,GREENSBORO,NC 27411, USA. OI Railsback, Steven/0000-0002-5923-9847 NR 29 TC 3 Z9 4 U1 0 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 OCT PY 1992 VL 28 IS 10 BP 2581 EP 2590 DI 10.1029/92WR01607 PG 10 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA JR409 UT WOS:A1992JR40900003 ER PT J AU SUN, ZM AF SUN, ZM TI DIRECT SCATTERING AND RECONSTRUCTION OF INTERNAL SOURCE SO WAVE MOTION LA English DT Article ID DISSIPATIVE WAVE-EQUATION; INVERSE SCATTERING; TIME DOMAIN; OPERATORS AB Direct scattering and inverse source problems are studied for a transient electric surface source in a dispersive or nondispersive slab. Composite operators that map the source current into transmitted waves are derived and used to establish Volterra type integral equations which are applied to solve the inverse source problem for the internal source function j(t). The source function j(t) is reconstructed numerically from the transmitted electric field at one side of the medium. Green's operators that map the source function to the internal field are studied for a homogeneous dispersive medium model. Linear integrodifferential equations with initial, boundary conditions and jump conditions of those Green's operator kernels are obtained. This provides an alternative way to obtain the composite operators. RP SUN, ZM (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 10 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD OCT PY 1992 VL 16 IS 3 BP 249 EP 263 DI 10.1016/0165-2125(92)90032-W PG 15 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA JU216 UT WOS:A1992JU21600007 ER PT J AU MORTIMER, RK CONTOPOULOU, CR KING, JS AF MORTIMER, RK CONTOPOULOU, CR KING, JS TI GENETIC AND PHYSICAL MAPS OF SACCHAROMYCES-CEREVISIAE .11. SO YEAST LA English DT Review ID RNA POLYMERASE-II; DNA-BINDING-PROTEIN; MITOCHONDRIAL RIBOSOMAL-PROTEINS; ENCODING MEVALONATE KINASE; CYCLIC AMP PATHWAY; BUD SITE SELECTION; YEAST-CELL GROWTH; MOLECULAR ANALYSIS; CHROMOSOME-III; MESSENGER-RNA C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MORTIMER, RK (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720, USA. FU NCRR NIH HHS [5 P40 RR04231-05] NR 232 TC 177 Z9 177 U1 3 U2 7 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0749-503X J9 YEAST JI Yeast PD OCT PY 1992 VL 8 IS 10 BP 817 EP 902 DI 10.1002/yea.320081002 PG 86 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Microbiology; Mycology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Microbiology; Mycology GA JV792 UT WOS:A1992JV79200001 PM 1413997 ER PT J AU GULOY, AM CORBETT, JD AF GULOY, AM CORBETT, JD TI THE SYNTHESIS AND STRUCTURE OF LA5PB3Z, Z = N, O - INTERSTITIAL DERIVATIVES OF A CR5B3-TYPE STRUCTURE SO ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE LA English DT Article DE SYNTHESIS, CRYSTAL STRUCTURE; LA5PB3N; LA5PB3O; CR5B3 STRUCTURE; INTERSTITIAL CHEMISTRY ID CRYSTAL-STRUCTURE AB Suitable proportions of La, La4Pb3 and La2O3 or LaN reacted in pressed pellets at 1050-degrees - 1250-degrees-C result in high yields of the title compounds. Single crystal X-ray studies of the oxide show it to be an isopointal, interstitial derivative of the Cr5B3 structure (I4/mcm, Z = 4, a = 8.6895(2) angstrom, c = 14.540(1) angstrom, R/R(w) = 3.0/3.5%). Oxygen or nitrogen atoms are bound in (La2)4 tetrahedra within chains along (0, 1/2, z). Negligible dimerization of the type characteristic of Cr5B3 is indicated by the Pb2-Pb2 separation, 3.550(1) angstrom. The structure is compared with other related examples. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 28 TC 26 Z9 26 U1 3 U2 8 PU JOHANN AMBROSIUS BARTH VERLAG PI HEIDELBERG PA IM WEIHER 10, D-69121 HEIDELBERG, GERMANY SN 0044-2313 J9 Z ANORG ALLG CHEM JI Z. Anorg. Allg. Chem. PD OCT PY 1992 VL 616 IS 10 BP 61 EP 66 DI 10.1002/zaac.19926161010 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JU390 UT WOS:A1992JU39000009 ER PT J AU MACKAY, R FRANZEN, HF AF MACKAY, R FRANZEN, HF TI NEW ZIRCONIUM KAPPA-PHASES SO ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE LA English DT Article DE ZIRCONIUM KAPPA-PHASES; CRYSTAL DATA ID DIFFRACTION; SYSTEMS AB The compounds Zr9W4S, Zr9Mo4S, and Zr9W4S1-xNixO3 have been prepared by high temperature techniques. They belong to the general group of K phases. Single crystal x-ray diffraction analysis of the mixed nickel/sulfide (Zr9.2W3.8S0.7Ni0.3O3.0, R = 2.6%) reveals nickel substitution for sulfur, and confirms oxygen occupancy of interstitial sites. 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 13 Z9 13 U1 0 U2 0 PU JOHANN AMBROSIUS BARTH VERLAG PI HEIDELBERG PA IM WEIHER 10, D-69121 HEIDELBERG, GERMANY SN 0044-2313 J9 Z ANORG ALLG CHEM JI Z. Anorg. Allg. Chem. PD OCT PY 1992 VL 616 IS 10 BP 154 EP 156 DI 10.1002/zaac.19926161023 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JU390 UT WOS:A1992JU39000022 ER PT J AU MORSS, LR SPENCE, TG AF MORSS, LR SPENCE, TG TI DETERMINATION OF THE ENTHALPIES OF FORMATION OF DYI2 AND DYI3 AND ESTIMATION OF THE DY-3+/DY-2+ STANDARD AQUEOUS ELECTRODE POTENTIAL SO ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE LA English DT Article DE DYSPROSIUMDIIODIDE; DYSPROSIUM TRIIODIDE; ENTHALPY; ELECTRODE POTENTIAL ID LANTHANIDE ELEMENTS; HALIDES; THERMOCHEMISTRY; YTTRIUM AB DyI2 and DyI3 were synthesized by literature techniques. Their enthalpies of solution were determined and their enthalpies of formation calculated to be DELTA(f)H-degrees(DyI2, s, 298 K) = -(394 +/- 16) kJ . mol-1 and DELTA(f)H-degrees(DyI3, s, 298 K) = - (616 +/- 10) kJ . mol-1. With appropriate literature and estimated enthalpies of solution and standard entropies, the E-degrees(Dy3+/Dy2+, aq) was calculated to be -(2.6 +/- 0.2) V. A comparison is made of the enthalpies of reduction of DyCl3 to DyCl2 and of DyI3 to DyI2. RP MORSS, LR (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 44 TC 8 Z9 8 U1 0 U2 2 PU JOHANN AMBROSIUS BARTH VERLAG PI HEIDELBERG PA IM WEIHER 10, D-69121 HEIDELBERG, GERMANY SN 0044-2313 J9 Z ANORG ALLG CHEM JI Z. Anorg. Allg. Chem. PD OCT PY 1992 VL 616 IS 10 BP 162 EP 168 DI 10.1002/zaac.19926161025 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JU390 UT WOS:A1992JU39000024 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E 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 CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELLARICCIA, BA DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEARNLEY, TA FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B 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 HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J 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 KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J 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 LEVY, JM LIEB, E LIKO, D LILLETHUN, E 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, C MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADIJICIC, D RAGAZZI, S 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 RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TRAINOR, MT 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 VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOLPONI, S 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 WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E 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 CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELLARICCIA, BA DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEARNLEY, TA FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B 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 HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J 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 KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J 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 LEVY, JM LIEB, E LIKO, D LILLETHUN, E 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, C MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADIJICIC, D RAGAZZI, S 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 RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TRAINOR, MT 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 VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOLPONI, S 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 WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D 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 MEASUREMENT OF THE PARTIAL WIDTH OF THE Z0 INTO B(B)OVER-BAR FINAL-STATES USING THEIR SEMILEPTONIC DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HEAVY FLAVOR PRODUCTION; LUND MONTE-CARLO AB The spectra of prompt electrons and muons from the semi-leptonic decays of heavy hadrons produced in Z0 decays have been used to measure the coupling of the Z0 to b quarks weighted by the B hadrons mean semi-leptonic branching fraction, giving a value: BR(sl)b*GAMMA(bbBAR)/GAMMA(H)=0.0221+/-0.0015. The data has also been used to measure the value of the fragmentation parameter, defined in the context of the LUND PS Model, version 7.2, giving: epsilon(b)=(8(+5/-3)+/-2) 10(-3). The corresponding value of the mean fraction of the beam energy taken by a B hadron in the fragmentation of a b quark is: X(E)bBAR=0.69(+0.02/-0.03)+/-0.01. If the values of GAMMA(bbBAR) and GAMMA(H) are taken from the Standard Model, the following value is obtained for the mean semi-leptonic braching fraction of B hadrons: BR(sl)b=(10.1+/-0.7)%. Taking the value of GAMMA(bbBAR)/GAMMA(H) from an independent analysis of DELPHI data based on the use of the boosted sphericity product, a value: BR(sl)b=(10.1+/-1.3)% is obtained. C1 UNIV TECN LISBOA, INST SUPER TECN, P-1000 LISBON, PORTUGAL. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. UNIV INSTELLING ANTWERP, DEPT PHYS, B-2610 WILRIJK, BELGIUM. UNIV LIBRE BRUXELLES VRIJE UNIV BRUSSELS, IIHE, B-1050 BRUSSELS, BELGIUM. UNIV ETAT MONS, FAC SCI, B-7000 MONS, BELGIUM. UNIV ATHENS, PHYS LAB, GR-10680 ATHENS, GREECE. UNIV BERGEN, DEPT PHYS, N-5007 BERGEN, NORWAY. UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY. IST NAZL FIS NUCL, BOLOGNA, ITALY. COLL FRANCE, PHYS CORPUSCULAIRE LAB, F-75231 PARIS 05, FRANCE. CERN, CH-1211 GENEVA 23, SWITZERLAND. UNIV LOUIS PASTEUR, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. NCSR DEMOKRITOS, INST NUCL PHYS, GR-15310 ATHENS, GREECE. UNIV GENOA, DIPARTIMENTO FIS, I-16146 GENOA, ITALY. IST NAZL FIS NUCL, I-16146 GENOA, ITALY. UNIV GRENOBLE 1, INST SCI NUCL, F-38026 GRENOBLE, FRANCE. SEFT, HIGH ENERGY PHYS RES INST, SF-00170 HELSINKI, FINLAND. JOINT INST NUCL RES, DUBNA 101000, USSR. UNIV KARLSRUHE, INST EXPTL KERNPHYS, W-7500 KARLSRUHE 1, GERMANY. INST NUCL PHYS, HIGH ENERGY PHYS LAB, PL-30055 KRAKOW 30, POLAND. CTR BRASILEIRO PESQUISAS, BR-22290 RIO DE JANEIRO, BRAZIL. UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, F-91405 ORSAY, FRANCE. UNIV LANCASTER, SCH PHYS & MAT, LANCASTER LA1 4YB, ENGLAND. UNIV LIVERPOOL, DEPT PHYS, LIVERPOOL L69 3BX, ENGLAND. UNIV PARIS 06, LPNHE, F-75230 PARIS 05, FRANCE. UNIV PARIS 07, F-75221 PARIS 05, FRANCE. UNIV LUND, DEPT PHYS, S-22363 LUND, SWEDEN. UNIV LYON 1, F-69622 VILLEURBANNE, FRANCE. UNIV COMPLUTENSE MADRID, E-28040 MADRID, SPAIN. UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY. NATL INST NUCL PHYS, MILAN, ITALY. NIELS BOHR INST, DK-2100 COPENHAGEN O, DENMARK. NATL INST NUCL & HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. NATL TECH UNIV ATHENS, DEPT PHYS, GR-15773 ATHENS, GREECE. UNIV OSLO, DEPT PHYS, N-1000 OSLO 3, NORWAY. UNIV OXFORD, NUCL PHYS LAB, OXFORD OX1 3RH, ENGLAND. UNIV PADUA, DIPARTIMENTO FIS, I-35131 PADUA, ITALY. IST NAZL FIS NUCL, PADUA, ITALY. PONTIFICIA UNIV CATOLICA, DEPT FIS, BR-22453 RIO DE JANEIRO, BRAZIL. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV ROME 2, DIPARTIMENTO FIS, I-00173 ROME, ITALY. NATL INST NUCL PHYS, ROME, ITALY. CENS, DEPT PHYS PARTICULES ELEMENT, F-91191 GIF SUR YVETTE, FRANCE. IST NAZL FIS NUCL, IST SUPER SANITA, I-00161 ROME, ITALY. UNIV SANTANDER, FAC CIENCIAS, E-39005 SANTANDER, SPAIN. PROTVINO HIGH ENERGY PHYS INST, PROTVINO, USSR. INST JOZEF STEFAN, LJUBLJANA, YUGOSLAVIA. UNIV STOCKHOLM, INST PHYS, S-11346 STOCKHOLM, SWEDEN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10125 TURIN, ITALY. IST NAZL FIS NUCL, TURIN, ITALY. IST NAZL FIS NUCL, TRIESTE, ITALY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. UNIV UDINE, IST FIS, I-33100 UDINE, ITALY. UNIV UPPSALA, DEPT RADIAT SCI, S-75121 UPPSALA, SWEDEN. UNIV VALENCIA, DFAMN, E-46100 BURJASSOT, SPAIN. UNIV VALENCIA, CSIC, IFIC, E-46100 BURJASSOT, SPAIN. AUSTRIAN ACAD SCI, INST HOCHENERGIEPHYS, A-1050 VIENNA, AUSTRIA. INST NUCL STUDIES, WARSAW, POLAND. UNIV WARSAW, PL-00681 WARSAW, POLAND. UNIV GESAMTHSCH WUPPERTAL, FACHBEREICH PHYS, W-5600 WUPPERTAL 1, GERMANY. RP ABREU, P (reprint author), UNIV TECN LISBOA, LIP, AV E GARCIA 14, P-1000 LISBON, PORTUGAL. RI Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; 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; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; 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; Zuniga, Juan/P-4385-2014 OI Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; 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; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Dracos, Marcos/0000-0003-0514-193X; 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; Zuniga, Juan/0000-0002-1041-6451 NR 21 TC 27 Z9 27 U1 0 U2 9 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD OCT PY 1992 VL 56 IS 1 BP 47 EP 61 PG 15 WC Physics, Particles & Fields SC Physics GA JU175 UT WOS:A1992JU17500007 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALESEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BERRGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E CASTILLO, MV 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 CIRIO, R 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 DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELLARICCIA, BA DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOEK, 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 EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEARNLEY, TA FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D CARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GAZIS, JP 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 HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCENAULT, 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 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 LONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KARANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENEIMARQUIS, 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 LEVY, JM LIEB, E LIKO, D LILLETHUN, E 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, I 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 MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S 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 RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TRAINOR, MT 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 VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOLPONI, S 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 WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALESEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BERRGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E CASTILLO, MV 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 CIRIO, R 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 DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELLARICCIA, BA DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOEK, 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 EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEARNLEY, TA FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D CARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GAZIS, JP 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 HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCENAULT, 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 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 LONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KARANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENEIMARQUIS, 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 LEVY, JM LIEB, E LIKO, D LILLETHUN, E 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, I 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 MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S 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 RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TRAINOR, MT 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 VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOLPONI, S 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 WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI CHARGED-PARTICLE MULTIPLICITY DISTRIBUTIONS FOR FIXED NUMBER OF JETS IN Z0 HADRONIC DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LUND MONTE-CARLO; E+E ANNIHILATION; 250 GEV/C; RAPIDITY DEPENDENCE; PETRA ENERGIES; GLUON JETS; COLLISIONS; INTERVALS; FRAGMENTATION; QUARK AB The multiplicity distributions of charged particles in full phase space and in restricted rapidity intervals for events with a fixed number of jets measured by the DELPHI detector are presented. The data are well reproduced by the Lund Parton Shower model and can also be well described by fitted negative binomial distributions. The properties of these distributions in terms of the clan model are discussed. In symmetric 3-jet events the candidate gluon jet is found not to be significantly different in average multiplicity than the mean of the other two jets, thus supporting previous results of the HRS and OPAL experiments. Similar results hold for events generated according to the LUND PS and to the HERWIG models, when the jets are defined by the JADE jet finding algorithm. The method seems to be insensitive for measuring the color charge ratio between gluons and quarks. C1 UNIV TECN LISBOA, INST SUPER TECN, P-1000 LISBON, PORTUGAL. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. UNIV INSTELLING ANTWERP, DEPT PHYS, B-2610 WILRIJK, BELGIUM. UNIV LIBRE BRUXELLES VRIJE UNIV BRUSSELS, IIHE, B-1050 BRUSSELS, BELGIUM. UNIV ETAT MONS, FAC SCI, B-7000 MONS, BELGIUM. UNIV ATHENS, PHYS LAB, GR-10680 ATHENS, GREECE. UNIV BERGEN, DEPT PHYS, N-5007 BERGEN, NORWAY. UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY. IST NAZL FIS NUCL, BOLOGNA, ITALY. COLL FRANCE, PHYS CORPUSCULAIRE LAB, F-75231 PARIS 05, FRANCE. CERN, CH-1211 GENEVA 23, SWITZERLAND. UNIV LOUIS PASTEUR, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. NCSR DEMOKRITOS, INST NUCL PHYS, GR-15310 ATHENS, GREECE. UNIV GENOA, DIPARTIMENTO FIS, I-16146 GENOA, ITALY. IST NAZL FIS NUCL, I-16146 GENOA, ITALY. UNIV GRENOBLE 1, INST SCI NUCL, F-38026 GRENOBLE, FRANCE. SEFT, HIGH ENERGY PHYS RES INST, SF-00170 HELSINKI, FINLAND. JOINT INST NUCL RES, DUBNA 101000, USSR. UNIV KARLSRUHE, INST EXPTL KERNPHYS, W-7500 KARLSRUHE 1, GERMANY. INST NUCL PHYS, HIGH ENERGY PHYS LAB, PL-30055 KRAKOW 30, POLAND. CTR BRASILEIRO PESQUISAS, BR-22290 RIO DE JANEIRO, BRAZIL. UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, F-91405 ORSAY, FRANCE. UNIV LANCASTER, SCH PHYS & MAT, LANCASTER LA1 4YB, ENGLAND. UNIV LIVERPOOL, DEPT PHYS, LIVERPOOL L69 3BX, ENGLAND. UNIV PARIS 06, LPNHE, F-75230 PARIS 05, FRANCE. UNIV PARIS 07, F-75221 PARIS 05, FRANCE. UNIV LUND, DEPT PHYS, S-22363 LUND, SWEDEN. UNIV LYON 1, F-69622 VILLEURBANNE, FRANCE. UNIV COMPLUTENSE MADRID, E-28040 MADRID, SPAIN. UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY. NATL INST NUCL PHYS, MILAN, ITALY. NIELS BOHR INST, DK-2100 COPENHAGEN O, DENMARK. NATL INST KERNFYS HOGE ENERGIEFYS, 1009 BD AMSTERDAM, NETHERLANDS. NATL TECH UNIV ATHENS, DEPT PHYS, GR-15773 ATHENS, GREECE. UNIV OSLO, DEPT PHYS, N-1000 OSLO 3, NORWAY. UNIV OXFORD, NUCL PHYS LAB, OXFORD OX1 3RH, ENGLAND. UNIV PADUA, DIPARTIMENTO FIS, I-35131 PADUA, ITALY. IST NAZL FIS NUCL, PADUA, ITALY. PONTIFICIA UNIV CATOLICA, DEPT FIS, BR-22453 RIO DE JANEIRO, BRAZIL. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV ROME 2, DIPARTIMENTO FIS, I-00173 ROME, ITALY. NATL INST NUCL PHYS, ROME, ITALY. CENS, DEPT PHYS PARTICULES ELEMENT, F-91191 GIF SUR YVETTE, FRANCE. IST NAZL FIS NUCL, IST SUPER SANITA, I-00161 ROME, ITALY. UNIV SANTANDER, FAC CIENCIAS, E-39005 SANTANDER, SPAIN. PROTVINO HIGH ENERGY PHYS INST, PROTVINO, USSR. INST JOZEF STEFAN, LJUBLJANA, YUGOSLAVIA. UNIV STOCKHOLM, INST PHYS, S-11346 STOCKHOLM, SWEDEN. UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10125 TURIN, ITALY. IST NAZL FIS NUCL, TURIN, ITALY. IST NAZL FIS NUCL, TRIESTE, ITALY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. UNIV UDINE, IST FIS, I-33100 UDINE, ITALY. UNIV UPPSALA, DEPT RADIAT SCI, S-75121 UPPSALA, SWEDEN. UNIV VALENCIA, DFAMN, E-46100 BURJASSOT, SPAIN. UNIV VALENCIA, CSIC, IFIC, E-46100 BURJASSOT, SPAIN. AUSTRIAN ACAD SCI, INST HOCHENERGIEPHYS, A-1050 VIENNA, AUSTRIA. INST NUCL STUDIES, WARSAW, POLAND. UNIV WARSAW, PL-00681 WARSAW, POLAND. UNIV GESAMTHSCH WUPPERTAL, FACHBEREICH PHYS, W-5600 WUPPERTAL 1, GERMANY. RP ABREU, P (reprint author), UNIV TECN LISBOA, LIP, AV E GARCIA 14, P-1000 LISBON, PORTUGAL. RI Botner, Olga/A-9110-2013; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; 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; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Varela, Joao/K-4829-2016; OI Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Dracos, Marcos/0000-0003-0514-193X; 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; 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; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; De Angelis, Alessandro/0000-0002-3288-2517; Varela, Joao/0000-0003-2613-3146; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 39 TC 42 Z9 42 U1 0 U2 11 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD OCT PY 1992 VL 56 IS 1 BP 63 EP 75 PG 13 WC Physics, Particles & Fields SC Physics GA JU175 UT WOS:A1992JU17500008 ER PT J AU ADAMS, DL AKCHURIN, N BELIKOV, NI BYSTRICKY, J CORCORAN, MD COSSAIRT, JD CRANSHAW, J DEREVSCHIKOV, AA ENYO, H FUNAHASHI, H GOTO, Y GRACHOV, OA GROSNICK, DP HILL, DA IMAI, K ITOW, Y IWATANI, K KRUEGER, KW KURODA, K LAGHAI, M LEHAR, F DELESQUEN, A LOPIANO, D LUEHRING, FC MAKI, T MAKINO, S MASAIKE, A MATULENKO, YA MESCHANIN, AP MICHALOWICZ, A MILLER, DH MIYAKE, K NAGAMINE, T NESSITEDALDI, F NESSI, M NGUYEN, C NURUSHEV, SB OHASHI, Y ONEL, Y PATALAKHA, DI PAULETTA, G PENZO, A READ, AL ROBERTS, JB VANROSSUM, L RYKOV, VL SAITO, N SALVATO, G SCHIAVON, P SKEENS, J SOLOVYANOV, VL SPINKA, H TAKASHIMA, R TAKEUTCHI, F TAMURA, N TANAKA, N UNDERWOOD, DG VASILIEV, AN VILLARI, A WHITE, JL YAMASHITA, S YOKOSAWA, A YOSHIDA, T ZANETTI, A AF ADAMS, DL AKCHURIN, N BELIKOV, NI BYSTRICKY, J CORCORAN, MD COSSAIRT, JD CRANSHAW, J DEREVSCHIKOV, AA ENYO, H FUNAHASHI, H GOTO, Y GRACHOV, OA GROSNICK, DP HILL, DA IMAI, K ITOW, Y IWATANI, K KRUEGER, KW KURODA, K LAGHAI, M LEHAR, F DELESQUEN, A LOPIANO, D LUEHRING, FC MAKI, T MAKINO, S MASAIKE, A MATULENKO, YA MESCHANIN, AP MICHALOWICZ, A MILLER, DH MIYAKE, K NAGAMINE, T NESSITEDALDI, F NESSI, M NGUYEN, C NURUSHEV, SB OHASHI, Y ONEL, Y PATALAKHA, DI PAULETTA, G PENZO, A READ, AL ROBERTS, JB VANROSSUM, L RYKOV, VL SAITO, N SALVATO, G SCHIAVON, P SKEENS, J SOLOVYANOV, VL SPINKA, H TAKASHIMA, R TAKEUTCHI, F TAMURA, N TANAKA, N UNDERWOOD, DG VASILIEV, AN VILLARI, A WHITE, JL YAMASHITA, S YOKOSAWA, A YOSHIDA, T ZANETTI, A TI LARGE-X(F) SPIN ASYMMETRY IN PI(0) PRODUCTION BY 200-GEV POLARIZED PROTONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HIGH CHI-F; ANALYZING-POWER; PI-0 PRODUCTION; SCATTERING; BEAM; CONSTITUENTS; MODELS; GEV/C AB The spin asymmetry A(N) for inclusive pi0 production by 200-GeV transversely-polarized protons on a liquid hydrogen target has been measured at Fermilab over a wide range of x(F), with 0.5 < p(T) < 2 GeV/c. At x(F) > 0. 3, the asymmetry rises with increasing x(F) and reaches a value of A(N) = 0.15 +/- 0.03 in the region 0.6 < x(F) < 0.8. This result provides new input regarding the question of the internal spin structure of transversely-polarized protons. Several experiments [1-6] have studied the transverse-spin asymmetry A(N) in inclusive pion, kaon, and proton production using either polarized proton targets or polarized proton beams at energies ranging from 6 to 40 GeV. The results have shown small asymmetries in the beam fragmentation region when the beam was unpolarized and the target polarized. Large asymmetries, A(N) = 0.3 or higher, have been observed [5, 6] in the same kinematical region when the beam was polarized and the target unpolarized. Recent data taken at the Fermilab spin physics facility has produced a series of significant results for different reactions and in different kinematical regions. The results in the beam fragmentation region have established that the spin dependence observed previously at lower energies is still present at the highest energy available. In particular, the measurement [7] of A(N) in inclusive pi0 production by 185-GeV polarized protons has shown an average of A(N) = 0.10 +/- 0.03, integrated over a broad kinematical region. C1 CENS,F-91191 GIF SUR YVETTE,FRANCE. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. HIROSHIMA UNIV,HIROSHIMA 724,JAPAN. SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV,USSR. UNIV IOWA,DEPT PHYS,IOWA CITY,IA 52242. UNIV OCCUPAT & ENVIRONM HLTH,KITAKYUSHU,FUKUOKA 807,JAPAN. KYOTO UNIV,KYOTO 606,JAPAN. KYOTO UNIV,KYOTO 612,JAPAN. KYOTO SANGYO UNIV,KYOTO 612,JAPAN. LAB PHYS PARTICULES,F-74017 ANNECY LE VIEUX,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV MESSINA,DIPARTIMENTO FIS,I-98100 MESSINA,ITALY. NORTHEASTERN STATE UNIV,TAHLEQUAH,OK 74464. NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60201. OKAYAMA UNIV,OKAYAMA 700,JAPAN. OSAKA CITY UNIV,OSAKA 558,JAPAN. RICE UNIV,TW BONNER NUCL LAB,HOUSTON,TX 77251. UNIV TRIESTE,DIPARTIMENTO FIS,I-34100 TRIESTE,ITALY. UNIV UDINE,I-33100 UDINE,ITALY. RP ADAMS, DL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Zanetti, Anna/I-3893-2012 NR 29 TC 88 Z9 90 U1 0 U2 2 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 OCT PY 1992 VL 56 IS 2 BP 181 EP 184 PG 4 WC Physics, Particles & Fields SC Physics GA JV537 UT WOS:A1992JV53700002 ER PT J AU DONCHESKI, MA HEWETT, JL AF DONCHESKI, MA HEWETT, JL TI SIGNALS FOR VIRTUAL LEPTOQUARK EXCHANGE AT HERA SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID SCALAR LEPTOQUARKS; SYMMETRY-BREAKING; EP COLLISIONS; Z0 DECAYS; COLLIDERS; SEARCH; PHENOMENOLOGY; CONSTRAINTS; QUARKS; MODELS AB We study the effects of virtual leptoquarks on charged current and neutral current processes at the ep collider HERA. We present the areas of parameter space that can be excluded at HERA by searching for deviations from Standard Model expectations. The best results are obtained by examining the ratio of neutral current to charged current cross sections, R = sigma(NC)/sigma(CC), where, with 200 pb-1 of integrated luminosity for unpolarized e- and e+ beams, HERA can search for leptoquarks with masses up to approximately 800 GeV, with leptoquark coupling strengths of order alpha(em). C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP DONCHESKI, MA (reprint author), UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706, USA. NR 44 TC 13 Z9 13 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 OCT PY 1992 VL 56 IS 2 BP 209 EP 214 DI 10.1007/BF01555516 PG 6 WC Physics, Particles & Fields SC Physics GA JV537 UT WOS:A1992JV53700006 ER PT J AU SHIN, DS DODDAPANENI, N PARK, SM AF SHIN, DS DODDAPANENI, N PARK, SM TI INSITU SPECTROELECTROCHEMICAL STUDIES OF OXYGEN REDUCTION IN DIMETHYL-SULFOXIDE AND PYRIDINE SO INORGANIC CHEMISTRY LA English DT Article ID TETRAMETHYLAMMONIUM SUPEROXIDE; DIOXYGEN AB Electrochemical reduction of oxygen has been studied employing in situ spectroelectrochemical techniques, and the results are reported. Absorption spectra of the electrogenerated superoxide ion recorded during the reduction of oxygen show maximum absorbances at 271 and 305 nm in dimethyl sulfoxide and pyridine, respectively. Molar absorptivities of 2006 (+/-74) and 768 (+/-58) L.mol-1.cm-1 have been determined for electrogenerated superoxide ions in DMSO and pyridine by employing cyclic voltammetric peak currents and respective derivative cyclic voltabsorptometric signals. The significant red shift observed for the absorption band in pyridine is explained by the difference in solvation energies of the superoxide ion in two solvents. The electrokinetic parameters obtained in these solvents are also consistent with this model. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 25 TC 14 Z9 14 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 30 PY 1992 VL 31 IS 20 BP 4060 EP 4064 DI 10.1021/ic00046a014 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JQ641 UT WOS:A1992JQ64100014 ER PT J AU WHANGBO, MH REN, J LIANG, W CANADELL, E POUGET, JP RAVY, S WILLIAMS, JM BENO, MA AF WHANGBO, MH REN, J LIANG, W CANADELL, E POUGET, JP RAVY, S WILLIAMS, JM BENO, MA TI SOME GENERAL CONDITIONS FOR HIDDEN FERMI-SURFACE NESTING SO INORGANIC CHEMISTRY LA English DT Article ID BAND ELECTRONIC-STRUCTURE; MONOPHOSPHATE TUNGSTEN BRONZES; CHARGE-DENSITY WAVES; BEDT-TTF; METAL; INSTABILITIES; SUPERCONDUCTIVITY; (BEDT-TTF)2REO4; P4W12O44; NBSE3 AB Certain low-dimensional metals exhibit charge density wave (CDW) instabilities although their individual Fermi surfaces do not have the nesting responsible for the observed CDW's. This phenomenon is explained in terms of the conept of hidden Fermi surface nesting. In order to find general conditions leading to hidden Fermi surface nesting in low-dimensional systems, we examined the electronic structures of two widely different classes of compounds, i.e., the inorganic transition-metal oxide Sr3V2O7 and the organic conducting salts (BEDT-TTF)2ReO4 and (BEDT-TTF)4Pt(C2O4)2. C1 UNIV PARIS 11,CHIM THEOR LAB,F-91405 ORSAY,FRANCE. N CAROLINA STATE UNIV,PHYS SOLIDES MED CTR,CNRS,LA 2,RALEIGH,NC 27695. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT,ARGONNE,IL 60439. RP WHANGBO, MH (reprint author), N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695, USA. RI Canadell, Enric/L-1062-2014 OI Canadell, Enric/0000-0002-4663-5226 NR 30 TC 38 Z9 38 U1 3 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 30 PY 1992 VL 31 IS 20 BP 4169 EP 4173 DI 10.1021/ic00046a034 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JQ641 UT WOS:A1992JQ64100034 ER PT J AU ZYWICZ, E AF ZYWICZ, E TI IMPLEMENTATION OF A LAMINA-BASED CONSTITUTIVE RELATIONSHIP FOR ANALYZING THICK COMPOSITES SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article AB The finite element implementation of a lamina-based elastic constitutive relation appropriate for describing the three-dimensional (3-D) behaviour of fibre composite laminated media is presented. Unconstrained by the two-dimensional restrictions accompanying plate and shell theories, this approach resolves the macro 3-D deformation fields found in 'thick' laminated or filament wound composites without requiring each lamina to be individually discretized to assign material properties. In rectangular isoparametric solid elements where laminae locally parallel an element 'face', the implementation represents 'exactly' the elastic laminate behaviour by replacing the discrete lamina stiffnesses with continuous polynomial moduli functions. Attributable directly to the lamina constitutive relationship used, appropriate for fibre-dominated material systems, the implementation automatically preserves interlaminar continuity of tractions and displacements within each element for laminates assembled from a single lamina type. The order of the effective moduli functions is determined by the element kinematics and by requiring identical net mid-surface elemental forces and moments. In general, this representation substantially reduces the number of stored variables and through-thickness integrations required, and allows 'exact' integration by higher-order Gaussian quadrature. Additionally a single element may span any portion or number of laminae, thus allowing nearly arbitrary meshing and solution resolution. Several numerical examples using 3-D 8-node isoparametric solid elements demonstrate the approach's convergence and overall behaviour. RP ZYWICZ, E (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 2 Z9 2 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD SEP 30 PY 1992 VL 35 IS 5 BP 1031 EP 1043 DI 10.1002/nme.1620350506 PG 13 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA JM513 UT WOS:A1992JM51300005 ER PT J AU SPILLER, E WILCZYNSKI, J STEARNS, D GOLUB, L NYSTROM, G AF SPILLER, E WILCZYNSKI, J STEARNS, D GOLUB, L NYSTROM, G TI IMAGING PERFORMANCE OF MULTILAYER X-RAY MIRRORS SO APPLIED PHYSICS LETTERS LA English DT Article ID TELESCOPES; ROUGHNESS; CORONA AB We analyze soft x-ray images of the solar corona, obtained on the day of the solar eclipse in July 1991, and find that the deviations of our telescope mirror from the perfect surface are less than 1 angstrom for spatial periods between 1 mum and 1 mm. Our thin film deposition technique allows us to reduce errors over larger periods to the 1 angstrom level. Thus, we are able to produce large (diameter over 20 cm) x-ray mirrors with diffraction limited resolution below 0.01 arcsec. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP SPILLER, E (reprint author), IBM CORP,DIV RES,TJ WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. OI Golub, Leon/0000-0001-9638-3082 NR 21 TC 20 Z9 20 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 SEP 28 PY 1992 VL 61 IS 13 BP 1481 EP 1483 DI 10.1063/1.107522 PG 3 WC Physics, Applied SC Physics GA JP604 UT WOS:A1992JP60400001 ER PT J AU WARREN, ME GOURLEY, PL HADLEY, GR VAWTER, GA BRENNAN, TM HAMMONS, BE LEAR, KL AF WARREN, ME GOURLEY, PL HADLEY, GR VAWTER, GA BRENNAN, TM HAMMONS, BE LEAR, KL TI ON-AXIS FAR-FIELD EMISSION FROM 2-DIMENSIONAL PHASE-LOCKED VERTICAL CAVITY SURFACE-EMITTING LASER ARRAYS WITH AN INTEGRATED PHASE-CORRECTOR SO APPLIED PHYSICS LETTERS LA English DT Article ID PATTERN AB We have fabricated large, two-dimensional (2D) arrays of optically pumped, phase-locked vertical cavity surface-emitting lasers that emit more than 50% of their light in a central on-axis lobe. The emission of the arrays was modified from the usual four-lobed far-field of 2D coupled arrays by incorporation of a binary phase-shift mask on the surface of the array. The array consists of Fabry-Perot resonators comprising GaAs/AlGaAs quantum wells surrounded by AlAs/AlGaAs quarterwave mirrors with a multiple order AlGaAs phase-delay layer on the top mirror stack. The phase-shift layer was etched away on alternating elements of the array. The resulting on-axis emission had an angular width of 2-degrees for an array of approximately 100 elements. RP WARREN, ME (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 61 Z9 61 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 28 PY 1992 VL 61 IS 13 BP 1484 EP 1486 DI 10.1063/1.107523 PG 3 WC Physics, Applied SC Physics GA JP604 UT WOS:A1992JP60400002 ER PT J AU WENDT, JR MARTENS, JS ASHBY, CIH PLUT, TA HIETALA, VM TIGGES, CP GINLEY, DS SIEGAL, MP PHILLIPS, JM HOHENWARTER, GKG AF WENDT, JR MARTENS, JS ASHBY, CIH PLUT, TA HIETALA, VM TIGGES, CP GINLEY, DS SIEGAL, MP PHILLIPS, JM HOHENWARTER, GKG TI YBA2CU3O7 NANOBRIDGES FABRICATED BY DIRECT-WRITE ELECTRON-BEAM LITHOGRAPHY SO APPLIED PHYSICS LETTERS LA English DT Article ID JUNCTION DC SQUIDS; FILMS AB A direct method for nondamaging, nanometer-scale patterning of high T(c) superconductor thin films is presented. We have fabricated superconducting nanobridges in high-quality, epitaxial thin-film YBa2Cu3O7 (YBCO) by combining direct-write electron beam lithography and an improved aqueous etchant. Weak links with both length and width dimensions less than 20 nm have exhibited critical currents at 77 K of 4-20 muA and I(c)R(n) products of 10-100 muV which compare favorably with results for other YBCO junction technologies. We have used this technique in the fabrication of a shock-wave pulse former as an initial demonstration of its applicability to monolithic superconductive electronics. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV WISCONSIN,DEPT ELECT & COMP ENGN,MADISON,WI 53706. PARKVIEW WORKS,MILTON,WI. RP WENDT, JR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 23 Z9 23 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 SEP 28 PY 1992 VL 61 IS 13 BP 1597 EP 1599 DI 10.1063/1.107508 PG 3 WC Physics, Applied SC Physics GA JP604 UT WOS:A1992JP60400040 ER PT J AU BHATTACHARYA, T GOCKSCH, A ALTES, CK PISARSKI, RD AF BHATTACHARYA, T GOCKSCH, A ALTES, CK PISARSKI, RD TI Z(N) INTERFACE TENSION IN A HOT SU(N) GAUGE-THEORY SO NUCLEAR PHYSICS B LA English DT Article ID ZETA-FUNCTION REGULARIZATION; HIGH-TEMPERATURE EXPANSIONS; FINITE-TEMPERATURE; FIELD-THEORY; SURFACE-TENSION; FREE-ENERGY; QCD MATTER; PHASE; CONFINEMENT; TRANSITIONS AB The interface tension between Z(N) vacua in a hot SU(N) gauge theory (without dynamical fermions) is computed at next to leading order in weak coupling. The Z(N) interface tension is related to the instanton of an effective action, which includes both classical and quantum terms; a general technique for treating consistently the saddle points of such effective actions is developed. Loop integrals which arise in the calculation are evaluated by means of zeta-function techniques. As a byproduct, up to two-loop order we find that the stable vacuum is always equivalent to the trivial one, and so respects charge-conjugation symmetry. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. CNRS,CTR PHYS THEOR,SECT 2,F-13288 MARSEILLE,FRANCE. RP BHATTACHARYA, T (reprint author), CENS,SERV PHYS THEOR,F-91191 GIF SUR YVETTE,FRANCE. RI Bhattacharya, Tanmoy/J-8956-2013 OI Bhattacharya, Tanmoy/0000-0002-1060-652X NR 38 TC 96 Z9 97 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 SEP 28 PY 1992 VL 383 IS 3 BP 497 EP 524 DI 10.1016/0550-3213(92)90086-Q PG 28 WC Physics, Particles & Fields SC Physics GA JU744 UT WOS:A1992JU74400003 ER PT J AU VOGT, R BRODSKY, SJ HOYER, P AF VOGT, R BRODSKY, SJ HOYER, P TI SYSTEMATICS OF CHARM PRODUCTION IN HADRONIC COLLISIONS SO NUCLEAR PHYSICS B LA English DT Article ID HEAVY-QUARK PRODUCTION; PRODUCTION CROSS-SECTION; D-MESON PRODUCTION; PI-P-INTERACTIONS; A-DEPENDENCE; J/PSI-PRODUCTION; QUANTUM CHROMODYNAMICS; PROTON INTERACTIONS; E+E ANNIHILATION; INTRINSIC CHARM AB We present a comprehensive QCD-based model for the x(f), p(T), and nuclear-target dependence of open-charm production in hadron-induced collisions. The predicted dependence on x(f) and p(T) reflects both leading-twist QCD fusion subprocesses, including shadowing and coalescence effects, and higher-twist intrinsic heavy-quark components of the hadron wavefunction. The model is compared with the systematics of charmed-hadron production in pi-p, pp, pi-A, and pA collisions. We find that the data cannot by described by leading-twist QCD contributions alone. Several features of the data show the presence of higher-twist mechanisms of the type we consider. Differences in kinematic acceptance between various experiments may explain some of the apparent discrepancies in the available data. C1 GESELL SCHWERIONENFORSCH GMBH, W-6100 DARMSTADT, GERMANY. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. UNIV HELSINKI, DEPT PHYS, SF-00170 HELSINKI 17, FINLAND. NR 71 TC 87 Z9 87 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 SEP 28 PY 1992 VL 383 IS 3 BP 643 EP 684 DI 10.1016/0550-3213(92)90091-O PG 42 WC Physics, Particles & Fields SC Physics GA JU744 UT WOS:A1992JU74400008 ER PT J AU BHANOT, G CREUTZ, M LACKI, J AF BHANOT, G CREUTZ, M LACKI, J TI LOW-TEMPERATURE EXPANSION FOR THE ISING-MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article AB On simple cubic lattices, we compute the low-temperature expansion for the energy of the Ising model through 50 excited bonds in three dimensions and 44 excited bonds in four dimensions. We also give the magnetization through 42 excited bonds. Our method is a recursive enumeration of states with given energies on a set of finite lattices with generalized helical boundary conditions. A linear combination of such lattices cancels finite volume effects. C1 THINKING MACHINES CORP,CAMBRIDGE,MA 02142. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP BHANOT, G (reprint author), INST ADV STUDY,SCH NAT SCI,PRINCETON,NJ 08540, USA. NR 12 TC 51 Z9 51 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 SEP 28 PY 1992 VL 69 IS 13 BP 1841 EP 1844 DI 10.1103/PhysRevLett.69.1841 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900003 ER PT J AU DAVIS, RL HODGES, HM SMOOT, GF STEINHARDT, PJ TURNER, MS AF DAVIS, RL HODGES, HM SMOOT, GF STEINHARDT, PJ TURNER, MS TI COSMIC MICROWAVE BACKGROUND PROBES MODELS OF INFLATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXTENDED INFLATION; UNIVERSE SCENARIO; PERTURBATIONS; RADIATION; FLUCTUATIONS; ANISOTROPY; PRESCRIPTION; CONSTRAINTS; COSMOLOGIES AB Inflation creates both scalar (density) and tensor (gravity wave) metric perturbations. We find that the tensor-mode contribution to the cosmic microwave background anisotropy on large-angular scales can only exceed that of the scalar mode in models where the spectrum of perturbations deviates significantly from scale invariance (e.g., extended and power-law inflation models and extreme versions of chaotic inflation). If the tensor mode dominates at large-angular scales, then the value of DELTAT/T predicted on 1-degrees is less than if the scalar mode dominates, and, for cold-dark-matter models, bias factors b > 1 can be made consistent with Cosmic Background Explorer (COBE) DMR results. C1 LAWRENCE BERKELEY LAB,SPACE SCI LAB,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,FERMILAB ASTROPHYS CTR,NASA,BATAVIA,IL 60510. RP DAVIS, RL (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. NR 24 TC 184 Z9 184 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 SEP 28 PY 1992 VL 69 IS 13 BP 1856 EP 1859 DI 10.1103/PhysRevLett.69.1856 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900007 ER PT J AU AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BAKER, R BALDINI, A BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, P CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHISSI, H DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, D LIPARI, P LIU, G LIU, R LONGO, MJ LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D MARTELLOTTI, G CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, DG MILLER, L MONACELLI, P MONTENO, M MUFSON, S MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V VERDONE, GR WALTER, CW WEBB, R WORSTELL, W AF AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BAKER, R BALDINI, A BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, P CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHISSI, H DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, D LIPARI, P LIU, G LIU, R LONGO, MJ LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D MARTELLOTTI, G CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, DG MILLER, L MONACELLI, P MONTENO, M MUFSON, S MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V VERDONE, GR WALTER, CW WEBB, R WORSTELL, W TI SEARCH FOR NUCLEARITES USING THE MACRO DETECTOR SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRANGE MATTER; COSMIC NUCLEARITES; LIMIT; FLUX; MONOPOLES; PARTICLES; LEVEL AB A negative search using 1/12 of the eventual MACRO detector has yielded nuclearite flux limits of 1.1 X 10(-14) cm-2sr-1s-1 for 10(-10) < m < 0.1 g, and 5 .5 X 10(-15) cm-2sr-1s-1 for m > 0.1 g. We have modified the formula of De Rujula and Glashow for the light yield of nuclearites to include the uv light absorbed and reemitted in the visible region, and proved that the MACRO sensitivity extends almost to the escape velocity of the Earth. Our flux limit, therefore, can be used to address nuclearites that are possibly trapped in the solar system. C1 IST NAZL FIS NUCL, I-70126 BARI, ITALY. DREXEL UNIV, DEPT PHYS, PHILADELPHIA, PA 19104 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 ROME, ITALY. IST NAZL FIS NUCL, LAB NAZL GRAN SASSO, I-67010 LAQUILA, ITALY. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. INDIANA UNIV, DEPT ASTRON, BLOOMINGTON, IN 47405 USA. UNIV LAQUILA, DIPARTIMENTO FIS, I-67100 LAQUILA, ITALY. UNIV LECCE, DIPARTIMENTO FIS, I-73100 LECCE, ITALY. IST NAZL FIS NUCL, I-73100 LECCE, ITALY. UNIV MICHIGAN, DEPT PHYS, ANN ARBOR, MI 48109 USA. NAPLES UNIV, DIPARTIMENTO FIS, I-80125 NAPLES, ITALY. IST NAZL FIS NUCL, I-56010 PISA, ITALY. UNIV PISA, DIPARTIMENTO FIS, I-56010 PISA, ITALY. IST NAZL FIS NUCL, I-56010 PISA, ITALY. UNIV ROME, DIPARTIMENTO FIS, I-00100 ROME, ITALY. NATL INST NUCL PHYS, ROME, ITALY. TEXAS A&M UNIV SYST, DEPT PHYS, COLL STN, TX 77843 USA. UNIV TURIN, DIPARTIMENTO FIS, I-10125 TURIN, ITALY. IST NAZL FIS NUCL, TURIN, ITALY. UNIV DELAWARE, BARTOL RES INST, NEWARK, DE 19716 USA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY. BOSTON UNIV, DEPT PHYS, BOSTON, MA 02215 USA. CALTECH, PASADENA, CA 91125 USA. RP UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. RI Cafagna, Francesco/A-9299-2010; Spurio, Maurizio/G-4170-2012; giglietto, nicola/I-8951-2012; Masera, Massimo/J-4313-2012; Ramello, Luciano/F-9357-2013; Lamanna, Ernesto/C-7658-2012; Barbarino, Giancarlo/L-2559-2015; Martello, Daniele/J-3131-2012; Cei, Fabrizio/M-8891-2016; Guarino, Fausto/I-3166-2012; gustavino, carlo/K-4355-2015; OI Masera, Massimo/0000-0003-1880-5467; Coutu, Stephane/0000-0003-2923-2246; Cafagna, Francesco/0000-0002-7450-4784; giglietto, nicola/0000-0002-9021-2888; Lamanna, Ernesto/0000-0002-7844-8230; Barbarino, Giancarlo/0000-0001-9253-3397; Martello, Daniele/0000-0003-2046-3910; Cei, Fabrizio/0000-0002-8313-3540; Guarino, Fausto/0000-0003-1427-9885; Cormack, Robert/0000-0001-5553-9984; Sciubba, Adalberto/0000-0002-3301-9176; Monteno, Marco/0000-0002-3521-6333; ERRIQUEZ, Onofrio/0000-0002-9784-6568; Bellotti, Roberto/0000-0003-3198-2708; gustavino, carlo/0000-0003-3232-7027; Carboni, Massimo/0000-0003-4296-3799; Petrera, Sergio/0000-0002-6029-1255 NR 19 TC 24 Z9 25 U1 0 U2 6 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 SEP 28 PY 1992 VL 69 IS 13 BP 1860 EP 1863 DI 10.1103/PhysRevLett.69.1860 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900008 ER PT J AU GELB, JM KWONG, W ROSEN, SP AF GELB, JM KWONG, W ROSEN, SP TI IMPLICATIONS OF NEW GALLEX RESULTS FOR THE MIKHEYEV-SMIRNOV-WOLFENSTEIN SOLUTION OF THE SOLAR NEUTRINO PROBLEM SO PHYSICAL REVIEW LETTERS LA English DT Article ID POSSIBLE EXPLANATION; REAL-TIME; OSCILLATIONS; MATTER; EARTH; REGENERATION; PUZZLE AB We compare the implications for Be-7 and pp neutrinos of the two Mikheyev-Smirnov-Wolfenstein fits to the new GALLEX solar neutrino measurements. Small-mixing-angle solutions tend to suppress the former as electron neutrinos, but not the latter, and large-angle solutions tend to reduce both by about a factor of 2. The consequences for BOREXINO and similar solar neutrino-electron scattering experiments are discussed. C1 UNIV TEXAS,DEPT PHYS,ARLINGTON,TX 76019. RP GELB, JM (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 35 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 28 PY 1992 VL 69 IS 13 BP 1864 EP 1866 DI 10.1103/PhysRevLett.69.1864 PG 3 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900009 ER PT J AU ANTARAMIAN, A HALL, LJ RASIN, A AF ANTARAMIAN, A HALL, LJ RASIN, A TI FLAVOR-CHANGING INTERACTIONS MEDIATED BY SCALARS AT THE WEAK SCALE SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRAL CURRENTS AB The quark and lepton mass matrices possess approximate flavor symmetries. Several results follow if the interactions of new scalars possess these approximate symmetries. Present experimental bounds allow these exotic scalars to have a weak-scale mass. The Glashow-Weinberg criterion is rendered unnecessary. Finally, rare leptonic B meson decays provide powerful probes of these scalars, especially if they are leptoquarks. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ANTARAMIAN, A (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 8 TC 132 Z9 132 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 SEP 28 PY 1992 VL 69 IS 13 BP 1871 EP 1873 DI 10.1103/PhysRevLett.69.1871 PG 3 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900011 ER PT J AU BLANPIED, G BLECHER, M CARACAPPA, A DJALALI, C DUVAL, MA GIORDANO, G HOBLIT, S KHANDAKER, M KISTNER, OC MATONE, G MICELI, L MIZE, WK PREEDOM, BM SANDORFI, AM SCHAERF, C SEALOCK, RM THORN, CE THORNTON, ST VAZIRI, K WHISNANT, CS ZHAO, X MOINESTER, MA AF BLANPIED, G BLECHER, M CARACAPPA, A DJALALI, C DUVAL, MA GIORDANO, G HOBLIT, S KHANDAKER, M KISTNER, OC MATONE, G MICELI, L MIZE, WK PREEDOM, BM SANDORFI, AM SCHAERF, C SEALOCK, RM THORN, CE THORNTON, ST VAZIRI, K WHISNANT, CS ZHAO, X MOINESTER, MA TI P((GAMMA)OVER-RIGHT-ARROW,PI-0) REACTION AND THE E2 EXCITATION OF THE DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTIAL-WAVE ANALYSIS; PION-PHOTOPRODUCTION; REGION; MODEL; QUARK AB Results from three independent measurements of the p(gammaover arrow pointing right, pi0) reaction are presented for incident photon energies between 243 and 314 MeV, and for c.m. angles of 105-degrees, 122-degrees, and 150-degrees. The ratio of cross sections measured with orthogonal states of linear polarization is sensitive to the E2 excitation of the DELTA resonance. Comparisons are made to the predictions of various models, all of which fail to reproduce these data. C1 IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. NATL INST NUCL PHYS,ROME,ITALY. RENSSELAER POLYTECH INST,TROY,NY 12180. UNIV ROME,I-00100 ROME,ITALY. TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. UNIV S CAROLINA,DEPT PHYS,COLUMBIA,SC 29208. VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22903. RP BLANPIED, G (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 17 TC 38 Z9 38 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 SEP 28 PY 1992 VL 69 IS 13 BP 1880 EP 1883 DI 10.1103/PhysRevLett.69.1880 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900014 ER PT J AU MORETTO, LG TSO, K COLONNA, N WOZNIAK, GJ AF MORETTO, LG TSO, K COLONNA, N WOZNIAK, GJ TI NEW RAYLEIGH-TAYLOR-LIKE SURFACE INSTABILITY AND NUCLEAR MULTIFRAGMENTATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; PHASE-TRANSITION; FRAGMENTATION; EMISSION; TEMPERATURE; RELAXATION; SCISSION; EVENTS; MATTER; TIME AB Nuclear disks and bubbles formed in central heavy-ion collisions, as simulated by means of Boltzmann-like kinetic equations, break up into several fragments due to a new kind of Rayleigh-Taylor-like surface instability. We demonstrate that a sheet of liquid, stable in the limit of noninteracting surfaces, becomes unstable due to surface-surface interactions. The onset of this instability is determined analytically. The relevance of this instability to nuclear multifragmentation is discussed. RP MORETTO, LG (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 34 TC 90 Z9 90 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 SEP 28 PY 1992 VL 69 IS 13 BP 1884 EP 1887 DI 10.1103/PhysRevLett.69.1884 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900015 ER PT J AU VANE, CR DATZ, S DITTNER, PF KRAUSE, HF BOTTCHER, C STRAYER, M SCHUCH, R GAO, H HUTTON, R AF VANE, CR DATZ, S DITTNER, PF KRAUSE, HF BOTTCHER, C STRAYER, M SCHUCH, R GAO, H HUTTON, R TI ELECTRON-POSITRON PAIR PRODUCTION IN COULOMB COLLISIONS OF ULTRARELATIVISTIC SULFUR IONS WITH FIXED TARGETS SO PHYSICAL REVIEW LETTERS LA English DT Article ID RELATIVISTIC HEAVY-IONS; DILEPTON EMISSION; CROSS-SECTION AB Angular and momentum distributions have been measured for positrons from electron-positron pairs created in peripheral collisions of 6.4-TeV sulfur ions with fixed targets of Al, Pd, and Au. The data are compared with results of several theoretical treatments. Measured differential cross sections peak at low momentum (less-than-or-equal-to 1 MeV/c), extend significantly to much higher momenta (> 17 MeV/c), and concentrate sharply in the forward direction, along the ion-beam axis. Positron yields scale as the square of the target nuclear charge as predicted by theory. C1 MANNE SIEGBAHN INST,STOCKHOLM,SWEDEN. UNIV LUND,S-22101 LUND,SWEDEN. RP VANE, CR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 18 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 SEP 28 PY 1992 VL 69 IS 13 BP 1911 EP 1914 DI 10.1103/PhysRevLett.69.1911 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900022 ER PT J AU RANDERIA, M TRIVEDI, N MOREO, A SCALETTAR, RT AF RANDERIA, M TRIVEDI, N MOREO, A SCALETTAR, RT TI PAIRING AND SPIN GAP IN THE NORMAL STATE OF SHORT COHERENCE LENGTH SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEAR MAGNETIC-RELAXATION; U HUBBARD-MODEL; BOSE CONDENSATION; 2 DIMENSIONS; CU; DYNAMICS; BEHAVIOR; PHASE; TC AB We study the normal state of the 2D attractive Hubbard model using quantum Monte Carlo simulations. We show that singlet pairing correlations develop above T(c), and the normal state of a short coherence length superconductor deviates from a canonical Fermi liquid. In the intermediate U regime, the spin susceptibility chi(s) is strongly temperature dependent, and the low-frequency spectral weight, as measured by the NMR relaxation rate 1/T1T, is shown to track chi(s). This provides a simple, qualitative explanation for the spin-gap behavior observed in several high-T(c) systems. C1 FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,CTR MAT RES & TECHNOL,TALLAHASSEE,FL 32306. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP RANDERIA, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI 223,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 24 TC 263 Z9 263 U1 3 U2 15 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 SEP 28 PY 1992 VL 69 IS 13 BP 2001 EP 2004 DI 10.1103/PhysRevLett.69.2001 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900045 ER PT J AU PESHKIN, M AF PESHKIN, M TI SCALAR AHARONOV-BOHM EXPERIMENT WITH NEUTRONS - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note RP PESHKIN, M (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 4 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 SEP 28 PY 1992 VL 69 IS 13 BP 2017 EP 2017 DI 10.1103/PhysRevLett.69.2017 PG 1 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900049 ER PT J AU KWA, SLS VANAMERONGEN, H LIN, S DEKKER, JP VANGRONDELLE, R STRUVE, WS AF KWA, SLS VANAMERONGEN, H LIN, S DEKKER, JP VANGRONDELLE, R STRUVE, WS TI ULTRAFAST ENERGY-TRANSFER IN LHC-II TRIMERS FROM THE CHL A/B LIGHT-HARVESTING ANTENNA OF PHOTOSYSTEM-II SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE ANTENNA; CHLOROPHYLL; LIGHT-HARVESTING COMPLEX; PHOTOSYSTEM-II; PLANT PHOTOSYNTHESIS; PUMP-PROBE SPECTROSCOPY; ULTRAFAST SPECTROSCOPY ID PIGMENT-PROTEIN COMPLEXES; PUMP-PROBE SPECTROSCOPY; HIGHER-PLANTS; ELECTRON CRYSTALLOGRAPHY; CIRCULAR-DICHROISM; CHLOROPHYLL; MEMBRANES; SPINACH; GREEN; SUBPOPULATIONS AB Time-resolved absorption difference profiles were obtained for LHC-II trimers, isolated from Photosystem II in spinach with n-dodecyl beta-D-maltoside, using one-color and two-color pump-probe techniques. The one-color isotropic signals are predominantly excited state absorption at 640 nm, and a combination of photobleaching and stimulated emission at wavelengths greater-than-or-equal-to 665 nm. At intermediate wavelengths, dynamic red-shifting due to downhill energy transfer among the chlorophyll (Chl) spectral forms produces a bipolar signal, in which prompt photo-bleaching/stimulated emission is superseded at later times by excited state absorption. Triexponential analyses of these profiles yield the lifetime components 2-6 ps (associated with the spectral shifting), 14-36 ps (possibly due to energy transfer between LHC-II monomers), and several hundred picoseconds. The one-color anisotropy decays are resolvable at 665-675 nm, with lifetimes of 4.3 to 6.3 ps. They are unresolvably fast (i.e., exhibit subpicosecond lifetimes) at 640-650 nm. The two-color isotropic absorption difference signals show clear spectral evolution arising from equilibration among the LHC-II spectral components for excitation wavelengths shorter than 670 nm. However, most of this spectral evolution occurs within less than 2.5 ps. No resolvable anisotropy decay was observed in the two-color experiments. Taken together, the one-color and two-color experiments indicate that both picosecond and subpicosecond energy transfer steps occur in this antenna. The faster processes appear to dominate the spectral equilibration; slower processes occur in isoenergetic energy transfers among the longer-wavelength Chl a spectral forms that absorb between 665 and 675 nm. The values of the long-time anisotropies r(infinity), measured in the one-color and two-color experiments, are qualitatively consistent with static linear dichroism spectra of these preparations. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. FREE UNIV AMSTERDAM, DEPT PHYS & ASTRON, 1007 MC AMSTERDAM, NETHERLANDS. RI van Amerongen, Herbert/J-9483-2016 OI van Amerongen, Herbert/0000-0002-9783-2895 NR 24 TC 66 Z9 68 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA JI Biochim. Biophys. Acta PD SEP 25 PY 1992 VL 1102 IS 2 BP 202 EP 212 DI 10.1016/0167-4838(92)90511-B PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JQ994 UT WOS:A1992JQ99400006 ER PT J AU HANSON, DK BACIOU, L TIEDE, DM NANCE, SL SCHIFFER, M SEBBAN, P AF HANSON, DK BACIOU, L TIEDE, DM NANCE, SL SCHIFFER, M SEBBAN, P TI IN BACTERIAL REACTION CENTERS PROTONS CAN DIFFUSE TO THE SECONDARY QUINONE BY ALTERNATIVE PATHWAYS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Note DE BACTERIUM; REACTION CENTER; QUINONE; PROTON TRANSLOCATION; (PURPLE BACTERIA) ID PHOTOSYNTHETIC REACTION CENTERS; RHODOPSEUDOMONAS-CAPSULATA; RHODOBACTER-SPHAEROIDES; ELECTRON-TRANSFER; COMPLEX AB The mechanisms of proton conduction to the reduced secondary quinone in bacterial reaction centers were studied in wild-type and genetically modified reaction centers from Rhodobacter capsulatus. In the L212-213AA double mutant (L212Glu --> Ala, L213Asp --> Ala), reaction center function is severely altered. However, a photocompetent revertant of this strain which carries a third 'compensating' mutation, M231Arg --> Leu, at about 15 angstrom from the secondary quinone, displays the normal proton binding function of the reaction center. Furthermore, the apparent pK values of group(s) involved in the stabilization of the semiquinone anion are restored by that mutation. We conclude that L212Glu and L213Asp are not obligatory residues for proton donation to Q(B) in Rb. capsulatus. We suggest that protons can be delivered to the Q(B) site from the cytoplasm via a network of proton channels activated by compensatory mutations, possibly involving water, molecules bound in the interior of the reaction center. C1 CNRS,UPR 407,BAT 24,F-91198 GIF SUR YVETTE,FRANCE. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. FU NIGMS NIH HHS [GM36598] NR 18 TC 61 Z9 61 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD SEP 25 PY 1992 VL 1102 IS 2 BP 260 EP 265 DI 10.1016/0005-2728(92)90108-E PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JQ994 UT WOS:A1992JQ99400013 PM 1327138 ER PT J AU UMBARGER, KO YAMAZAKI, M HUTSON, LD HAYASHI, F YAMAZAKI, A AF UMBARGER, KO YAMAZAKI, M HUTSON, LD HAYASHI, F YAMAZAKI, A TI HETEROGENEITY OF THE RETINAL G-PROTEIN TRANSDUCIN FROM FROG ROD PHOTORECEPTORS - BIOCHEMICAL-IDENTIFICATION AND CHARACTERIZATION OF NEW SUBUNITS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID GTP-BINDING PROTEIN; CYCLIC-GMP PHOSPHODIESTERASE; CGMP PHOSPHODIESTERASE; ADP-RIBOSYLATION; PERTUSSIS TOXIN; OUTER SEGMENTS; GAMMA-SUBUNITS; ALPHA-SUBUNIT; VISUAL EXCITATION; CYCLASE AB Transducin, a retinal G-protein, has been shown to exist as heterotrimers of alpha (39,000), beta (36,000), and gamma (approximately 7,000) subunits. Blue Sepharose CL-6B column chromatography of a transducin preparation extracted with a metal-free, low salt buffer containing GTP showed three distinct alpha and two distinct betagamma activities in frog (Rana catesbiana) rod outer segment. The binding of a hydrolysis-resistant GTP analog in these alpha fractions was proportional to the amount of the M(r) 39,000 protein. The first alpha was eluted in a complex with an inhibitory subunit of cGMP phosphodiesterase, but alpha subunits in the second and the third fractions were not complexed with any proteins. Two-dimensional gel electrophoresis and characterization with regard to the interaction with the inhibitory subunit of cGMP phoshodiesterase suggested that the first and the second alphas were the same protein; however, the third alpha showed different characters as follows. We designated alpha in the first two fractions as alpha1, and alpha in the third fraction as alpha2. Nonlinear regression analysis for the binding of a hydrolysis-resistant GTP analog to both alpha subunits revealed a single class of GTP binding sites with an apparent stoichiometry of 1 mol of GTP/mol of alpha. Compared with alpha1, alpha2 required larger amounts of rhodopsin and betagamma for the binding of a hydrolysis-resistant GTP analog. Alpha2 also showed less binding with the inhibitory subunit of cGMP phosphodiesterase. Both alpha1 and alpha2 complexed with betagamma or betadelta (described below) were substrates for pertussis toxin-dependent ADP-ribosylation. The protein profiles of two betagamma fractions revealed that the main fraction was composed of a betagamma complex; however, the second active fraction was composed of beta complexed with delta (M(r) 12,000). Compared with betagamma, betadelta stimulated GTP binding to alpha1 at approximately 10-fold higher concentration. Two-dimensional gel electrophoresis revealed five beta and two gamma isoforms in betagamma. Only one beta isoform was present in betadelta. The diversity of transducin subunits may reflect different signaling pathways in visual signal transduction. C1 WAYNE STATE UNIV,SCH MED,KRESGE EYE INST,DEPT OPHTHALMOL,4717 ST ANTOINE ST,DETROIT,MI 48201. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. WAYNE STATE UNIV,SCH MED,DEPT PHARMACOL,DETROIT,MI 48201. FU NEI NIH HHS [EY07546, EY09631] NR 38 TC 10 Z9 10 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 25 PY 1992 VL 267 IS 27 BP 19494 EP 19502 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JP593 UT WOS:A1992JP59300073 PM 1326554 ER PT J AU FARROW, RL RAKESTRAW, DJ AF FARROW, RL RAKESTRAW, DJ TI DETECTION OF TRACE MOLECULAR-SPECIES USING DEGENERATE 4-WAVE-MIXING SO SCIENCE LA English DT Article ID OH; FLAME; BANDWIDTH; LASERS AB Spectroscopies that make use of laser light have provided an important tool to modern researchers for the nonintrusive analysis of chemical systems. The strengths and limitations of these spectroscopic techniques often determine the viability of scientific investigations. The unique properties of degenerate four-wave mixing, a nonlinear optical technique, have recently been found to provide powerful capabilities for a wide range of applications. RP FARROW, RL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 33 TC 143 Z9 144 U1 0 U2 18 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 25 PY 1992 VL 257 IS 5078 BP 1894 EP 1900 DI 10.1126/science.257.5078.1894 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JP594 UT WOS:A1992JP59400021 PM 17753495 ER PT J AU STOUTLAND, PO DYER, RB WOODRUFF, WH AF STOUTLAND, PO DYER, RB WOODRUFF, WH TI ULTRAFAST INFRARED-SPECTROSCOPY SO SCIENCE LA English DT Article ID VIBRATIONAL-ENERGY TRANSFER; TUNABLE PICOSECOND PULSES; NON-RRKM DECOMPOSITION; CYTOCHROME-C-OXIDASE; OPTICAL PULSES; TRANSIENT ABSORPTION; NAKED CR(CO)5; TIME; RELAXATION; DYNAMICS AB Recent advances in ultrafast infrared spectroscopy are described, including experimental details and fundamental limitations. The utility of this technique is illustrated with two recent examples. C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. RP STOUTLAND, PO (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. FU NIDDK NIH HHS [DK36263]; NIGMS NIH HHS [GM48509] NR 59 TC 63 Z9 63 U1 3 U2 20 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 25 PY 1992 VL 257 IS 5078 BP 1913 EP 1917 DI 10.1126/science.1329200 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JP594 UT WOS:A1992JP59400024 PM 1329200 ER PT J AU HETHERINGTON, DL KLEM, JF WEAVER, HT AF HETHERINGTON, DL KLEM, JF WEAVER, HT TI CHARGE STORAGE IN VERTICALLY INTEGRATED GAAS N-CHANNEL JFET JUNCTION CAPACITOR DEVICE SO ELECTRONICS LETTERS LA English DT Article DE FIELD-EFFECT TRANSISTORS; CAPACITORS AB A GaAs vertical npn structure in which the bottom layer serves as a JFET charge sensing channel has been fabricated and tested as a dynamic memory element. The device can be read nondestructively and exhibits tens of seconds storage times at room temperature. Use of an n channel for sensing charge provides increased sensitivity compared to earlier p-channel device. C1 UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721. RP HETHERINGTON, DL (reprint author), SANDIA NATL LABS,DEPT 1321,ALBUQUERQUE,NM 87185, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 24 PY 1992 VL 28 IS 20 BP 1861 EP 1863 DI 10.1049/el:19921191 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JT461 UT WOS:A1992JT46100007 ER PT J AU ATWOOD, D SONI, A AF ATWOOD, D SONI, A TI CHIRAL PERTURBATION-THEORY CONSTRAINT ON THE ELECTRIC-DIPOLE MOMENT OF THE LAMBDA HYPERON SO PHYSICS LETTERS B LA English DT Article ID QUARK AB We introduce a general CP-violating photon-baryon coupling, that induces an electric dipole moment at leading order into a partially broken SU(3)L X SU(3)R chiral theory. Our calculations show that very likely (i.e. barring accidental cancellations) the one loop corrections to the nucleon electric dipole moment are at least O(10(-1)) times the hyperon electric dipole moment in this model. Using the current bound on the neutron (d(n) less-than-or-equal-to 10(-25) e cm) we are thus led to suggest that d(LAMBDA) less-than-or-equal-to 10(-23) e cm. This bound on d(LAMBDA) is about seven orders of magnitude more stringent than the current direct experimental bound of 10(-16) e cm. RP ATWOOD, D (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, 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 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 24 PY 1992 VL 291 IS 3 BP 293 EP 296 DI 10.1016/0370-2693(92)91048-E PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ004 UT WOS:A1992JQ00400016 ER PT J AU ABBOTT, T AKIBA, Y BEAVIS, D BLOOMER, MA BOND, PD CHASMAN, C CHEN, Z CHU, YY 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 HUANG, HZ IKEDA, Y JURICIC, I KANG, J KATCOFF, S KAUFMAN, S KIMURA, K KITAMURA, K KURITA, K LEDOUX, RJ LEVINE, MJ MIAKE, Y MORSE, RJ MOSKOWITZ, B NAGAMIYA, S OLNESS, J PARSONS, CG REMSBERG, LP SAKURAI, H SARABURA, M STANKUS, P STEADMAN, SG STEPHANS, GSF SUGITATE, T TANNENBAUM, MJ VANDIJK, JH VIDEBAEK, F VIENT, M VINCENT, P VUTSADAKIS, V WEGNER, HE WOODRUFF, DS WU, YD ZAJC, W AF ABBOTT, T AKIBA, Y BEAVIS, D BLOOMER, MA BOND, PD CHASMAN, C CHEN, Z CHU, YY 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 HUANG, HZ IKEDA, Y JURICIC, I KANG, J KATCOFF, S KAUFMAN, S KIMURA, K KITAMURA, K KURITA, K LEDOUX, RJ LEVINE, MJ MIAKE, Y MORSE, RJ MOSKOWITZ, B NAGAMIYA, S OLNESS, J PARSONS, CG REMSBERG, LP SAKURAI, H SARABURA, M STANKUS, P STEADMAN, SG STEPHANS, GSF SUGITATE, T TANNENBAUM, MJ VANDIJK, JH VIDEBAEK, F VIENT, M VINCENT, P VUTSADAKIS, V WEGNER, HE WOODRUFF, DS WU, YD ZAJC, W TI CENTRALITY DEPENDENCE OF K+ AND PI+ MULTIPLICITIES FROM SI+A COLLISIONS AT 14.6-A GEV/C SO PHYSICS LETTERS B LA English DT Article ID QUARK-GLUON-PLASMA; HEAVY-ION COLLISIONS; STRANGENESS PRODUCTION; PARTICLE-PRODUCTION; NUCLEUS COLLISIONS; DETECTOR; SYSTEM; MODEL; KAON; FLOW AB K+ and pi+ multiplicities have been measured in a magnetic spectrometer for Si+Al, Si+Cu and Si+Au collisions at 14.6 A GeV/c incident momentum. The multiplicities were obtained for rive different windows of forward kinetic energy as detected in a zero degree calorimeter. The K+/pi+ multiplicity ratio ranges from almost-equal-to 9% in peripheral interactions to 19% in central Si+Au. The largest K+/pi+ ratios are observed for those events for each target that leave the least energy in the zero degree calorimeter and the ratio increases with target mass. The observations suggest that multiple interactions are important in the particle production mechanism. C1 UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. UNIV TOKYO,INST NUCL STUDY,TOKYO 188,JAPAN. BROOKHAVEN NATL LAB,UPTON,NY 11973. MIT,CAMBRIDGE,MA 02139. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. KYUSHU UNIV,FUKUOKA 812,JAPAN. COLUMBIA UNIV,NEW YORK,NY 10027. NEVIS LABS,IRVINGTON,NY 10533. ARGONNE NATL LAB,ARGONNE,IL 60439. HIROSHIMA UNIV,HIROSHIMA 730,JAPAN. RI 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; Tannenbaum, Michael/0000-0002-8840-5314 NR 27 TC 14 Z9 14 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 SEP 24 PY 1992 VL 291 IS 3 BP 341 EP 346 DI 10.1016/0370-2693(92)91056-F PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ004 UT WOS:A1992JQ00400024 ER PT J AU AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BECKMANN, R BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KLEMPT, E KOCH, H KONIGSMANN, K KOLO, C KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BECKMANN, R BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KLEMPT, E KOCH, H KONIGSMANN, K KOLO, C KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI PROTON-ANTIPROTON ANNIHILATION INTO ETA-ETA-PI-OBSERVATION OF A SCALAR RESONANCE DECAYING INTO ETA-ETA SO PHYSICS LETTERS B LA English DT Article ID G(1590) AB The results of a measurement of ppBAR annihilation at rest into etaetapi0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar J(PC)=0++ resonance decaying into etaeta is observed with a mass of 1560+/-25 MeV/c2 and a width of 245+/-50 MeV/c2. C1 UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV MAINZ,W-6500 MAINZ,GERMANY. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 12 TC 77 Z9 77 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 24 PY 1992 VL 291 IS 3 BP 347 EP 354 DI 10.1016/0370-2693(92)91057-G PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ004 UT WOS:A1992JQ00400025 ER PT J AU BORDWELL, FG ZHANG, XM ALNAJJAR, MS AF BORDWELL, FG ZHANG, XM ALNAJJAR, MS TI EFFECTS OF ADJACENT ACCEPTORS AND DONORS ON THE STABILITIES OF CARBON-CENTERED RADICALS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID BOND-DISSOCIATION ENERGIES; DIMETHYL-SULFOXIDE SOLUTION; C-H BONDS; HINDERED FREE-RADICALS; STABILIZATION ENERGIES; SPIN DELOCALIZATION; METHYL RADICALS; ACIDITIES; SUBSTITUENTS; CATIONS AB The radical stabilization energies (RSEs) for 21 radicals, GCH2., where G is an electron donor or acceptor group, were estimated from differences in homolytic C-H bond dissociation energies (DELTA-BDEs relative to that of methane). These RSEs were found to agree reasonably well in order with theoretically calculated RSEs that have been reported and with those obtained by averaging RSEs from nine different methods (a literature RRS(x) scale). But the RSEs estimated from DELTA-BDEs were almost without exception larger because the theoretical calculations and RRS(x) method greatly underestimate the size of most RSEs. The RSEs for GCH2. radicals were found to be enhanced to the extent that G is able to delocalize an odd electron on an adjacent carbon atom and were diminished by the presence of electron-withdrawing properties in G. Most groups stabilize the radical, but when the electron-withdrawing effect of the group is large, as in F3C. and Me3N+CH2. radicals, the net effect is to destabilize the radical relative to the methyl radical. The RSEs of 12 radicals of the type RSC.HG or PhSC.HG, relative to that of the GCH2. radical, were found to increase progressively as the acceptor group G was changed along the series Ph, fluorenyl (Fl), CO2Et, CN, COMe, and COPh. The RSEs of these donor-acceptor radicals were all smaller than the sum of the RSEs of the singly-substituted radicals, GCH2. and PhSCH2. (or RSCH2.). The effects of a second PhS or like donor and of a second acceptor on the RSEs were also determined. Examination of the RSEs of GC.(Ph)CN radicals indicates that the interactions of G and CN in the GC.CN moieties, with G = MeO, EtS, or c-C5H10N, are not synergistic as has been claimed from ESR studies. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP BORDWELL, FG (reprint author), NORTHWESTERN UNIV, DEPT CHEM, EVANSTON, IL 60208 USA. NR 46 TC 119 Z9 119 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 23 PY 1992 VL 114 IS 20 BP 7623 EP 7629 DI 10.1021/ja00046a003 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA JP512 UT WOS:A1992JP51200003 ER PT J AU DEMING, TJ NOVAK, BM AF DEMING, TJ NOVAK, BM TI ENANTIOSELECTIVE POLYMERIZATIONS OF ACHIRAL ISOCYANIDES - PREPARATION OF OPTICALLY-ACTIVE HELICAL POLYMERS USING CHIRAL NICKEL-CATALYSTS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID SENSE SELECTIVE POLYMERIZATION; POLYISOCYANIDES; STEREOCHEMISTRY; COMPLEXES C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RI Deming, Timothy/I-5411-2013 NR 25 TC 83 Z9 83 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 23 PY 1992 VL 114 IS 20 BP 7926 EP 7927 DI 10.1021/ja00046a057 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA JP512 UT WOS:A1992JP51200057 ER PT J AU ELLMAN, JA VOLKMAN, BF MENDEL, D SCHULTZ, PG WEMMER, DE AF ELLMAN, JA VOLKMAN, BF MENDEL, D SCHULTZ, PG WEMMER, DE TI SITE-SPECIFIC ISOTOPIC LABELING OF PROTEINS FOR NMR-STUDIES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID NUCLEAR-MAGNETIC-RESONANCE; UNNATURAL AMINO-ACIDS; TRANSFER-RNAS; ASSIGNMENT; N-15; RESIDUES; LYSOZYME; C-13; H-1 C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. RI Ellman, Jonathan/C-7732-2013 NR 24 TC 44 Z9 44 U1 0 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 SEP 23 PY 1992 VL 114 IS 20 BP 7959 EP 7961 DI 10.1021/ja00046a080 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JP512 UT WOS:A1992JP51200080 ER PT J AU HIGASHI, M ABE, T BURNS, TP AF HIGASHI, M ABE, T BURNS, TP TI CARBON NITROGEN-BALANCE AND TERMITE ECOLOGY SO PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES LA English DT Article AB Termites, feeding on dead plant matter with a carbon to nitrogen ratio much higher than their own tissues, have to balance their C and N inputs. Two classes of C-N balancing mechanisms are possible: adding N to inputs, or selectively eliminating C. Termites achieve both of these mechanisms with the aid of microorganisms (symbionts). We first show that a termite can utilize food resources, thus attain productivity, only to the extent that the C-N balance capabilities of the termite-symbionts system allow. Two hypotheses follow: (i) 'one-piece' termites (species nesting in and consuming wood) tend not to possess C-eliminating symbionts, whereas 'separate' termites (species foraging outside their nests' tend to have a full range of C-N balance symbionts; this advantage for separate termites results in their observed greater productivity and colony size; and (ii) only separate termites have a sterile worker caste because their ability to utilize resources, which is conferred by their C-N balancing symbionts, makes the increase in a true (sterile) worker's contribution to the reproductives' fitness, combined with their higher nest stability, great enough to exceed the threshold for the evolution from false to true workers. C1 KYOTO UNIV, CTR ECOL RES, SHIMOSAKAMOTO 52001, JAPAN. OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. RP HIGASHI, M (reprint author), RYUKOKU UNIV, FAC SCI & TECHNOL, SETA 52021, JAPAN. NR 21 TC 48 Z9 50 U1 1 U2 11 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 0962-8452 J9 P ROY SOC B-BIOL SCI JI Proc. R. Soc. B-Biol. Sci. PD SEP 22 PY 1992 VL 249 IS 1326 BP 303 EP 308 DI 10.1098/rspb.1992.0119 PG 6 WC Biology; Ecology; Evolutionary Biology SC Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology; Evolutionary Biology GA JQ914 UT WOS:A1992JQ91400012 ER PT J AU HOHIMER, JP VAWTER, GA CRAFT, DC HADLEY, GR AF HOHIMER, JP VAWTER, GA CRAFT, DC HADLEY, GR TI INTERFEROMETRIC RING DIODE-LASERS SO APPLIED PHYSICS LETTERS LA English DT Article AB We report the first demonstration of interferometric ring diode lasers. These devices show a sharply peaked light versus current curve with cw output powers up to 8 mW. The output emission is single-frequency with side-mode-rejection ratios up to 30 dB. RP HOHIMER, JP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 21 PY 1992 VL 61 IS 12 BP 1375 EP 1377 DI 10.1063/1.107542 PG 3 WC Physics, Applied SC Physics GA JN991 UT WOS:A1992JN99100003 ER PT J AU DANDOLOFF, R BALAKRISHNAN, R BISHOP, AR AF DANDOLOFF, R BALAKRISHNAN, R BISHOP, AR TI 2-LEVEL SYSTEMS - SPACE CURVE FORMALISM, BERRY PHASE AND GAUSS-BONNET THEOREM SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Letter ID QUANTUM AB We study the projective space representation of a general two-level system introduced by Feynman et al. This allows a mapping onto a space curve. Geometric phases, Berry's phase and its complementary phase are calculated. The relation with the Gauss-Bonnet theorem is discussed and an inequality for the Berry phase is derived. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. INST MATH SCI,MADRAS 600113,INDIA. RP DANDOLOFF, R (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 TC 4 Z9 4 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD SEP 21 PY 1992 VL 25 IS 18 BP L1105 EP L1110 PG 6 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA JQ526 UT WOS:A1992JQ52600003 ER PT J AU SHARPE, SR GUPTA, R KILCUP, GW AF SHARPE, SR GUPTA, R KILCUP, GW TI LATTICE CALCULATION OF I = 2 PION-SCATTERING LENGTH SO NUCLEAR PHYSICS B LA English DT Article ID QUANTUM-FIELD THEORIES; STAGGERED FERMIONS; VOLUME DEPENDENCE; ENERGY-SPECTRUM; STATES; QCD AB We present results for the I = 2 pion scattering length calculated using staggered fermions in the quenched approximation. The calculation uses the finite-volume dependence of the energy of a two-pion state. We find good agreement with current algebra predictions for scattering of Goldstone pions, and reasonable agreement for the non-Goldstone pions. C1 CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,NEWPORT NEWS,VA 23606. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RP SHARPE, SR (reprint author), UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106, USA. NR 29 TC 73 Z9 73 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 SEP 21 PY 1992 VL 383 IS 1-2 BP 309 EP 354 DI 10.1016/0550-3213(92)90681-Z PG 46 WC Physics, Particles & Fields SC Physics GA JT151 UT WOS:A1992JT15100014 ER PT J AU MCGAUGHEY, PL MOSS, JM ALDE, DM BAER, HW CAREY, TA GARVEY, GT KLEIN, A LEE, C LEITCH, MJ LILLBERG, JW MISHRA, CS PENG, JC BROWN, CN COOPER, WE HSIUNG, YB ADAMS, MR GUO, R KAPLAN, DM MCCARTHY, RL DANNER, G WANG, MJ BARLETT, ML HOFFMANN, GW AF MCGAUGHEY, PL MOSS, JM ALDE, DM BAER, HW CAREY, TA GARVEY, GT KLEIN, A LEE, C LEITCH, MJ LILLBERG, JW MISHRA, CS PENG, JC BROWN, CN COOPER, WE HSIUNG, YB ADAMS, MR GUO, R KAPLAN, DM MCCARTHY, RL DANNER, G WANG, MJ BARLETT, ML HOFFMANN, GW TI LIMIT ON THE (D)BAR-(U)BAR ASYMMETRY OF THE NUCLEON SEA FROM DRELL-YAN PRODUCTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTON DISTRIBUTIONS; GOTTFRIED SUM; DEPENDENCE; BREAKING; RATIO AB We present an analysis of 800 GeV proton-induced Drell-Yan production data from isoscalar (IS) targets H-2 and C, and from W, which has a large neutron excess. The ratio of cross sections per nucleon, R = sigma(W)/sigma(IS), is sensitive to the difference between the dBAR(x) and uBAR(x structure functions of the proton. We find that R is close to unity in the range 0.04 less-than-or-equal-to x less-than-or-equal-to 0.27, allowing upper limits to be set on the dBAR-uBAR asymmetry. Additionally, the shape of the differential cross section m3 d2-sigma/dx(F) dm for H-2 at x(F) almost-equal-to 0 shows no evidence of an asymmetric sea in the proton. We examine the implications of these data for various models of the violation of the Gottfried sum rule in deep-inelastic lepton scattering. C1 NO ILLINOIS UNIV,DE KALB,IL 60115. UNIV TEXAS,AUSTIN,TX 78712. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. SUNY STONY BROOK,STONY BROOK,NY 11794. UNIV ILLINOIS,CHICAGO,IL 60680. CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. RP MCGAUGHEY, PL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 20 TC 52 Z9 52 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 SEP 21 PY 1992 VL 69 IS 12 BP 1726 EP 1728 DI 10.1103/PhysRevLett.69.1726 PG 3 WC Physics, Multidisciplinary SC Physics GA JN946 UT WOS:A1992JN94600003 ER PT J AU WU, XY ASOKAKUMAR, P GREENBERG, JS HENDERSON, SD HUOMO, H LYNN, KG LUBELL, MS MAYER, R MCDONOUGH, J PHLIPS, BF VEHANEN, A AF WU, XY ASOKAKUMAR, P GREENBERG, JS HENDERSON, SD HUOMO, H LYNN, KG LUBELL, MS MAYER, R MCDONOUGH, J PHLIPS, BF VEHANEN, A TI SEARCH FOR LOW-MASS STATES IN ELASTIC E(+)E(-) SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; BHABHA SCATTERING; PARTICLE; ENERGIES AB We report results of an experiment to search for a resonance enhancement of the e+ e- scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/c2 < M(X0) < 1860 keV/c2 that can be associated with the e+ e- sum-peak energies in GSI heavy-ion experiments. Under the assumption that the e+ e- channel dominates, we deduce lower limits on lifetimes tau > 3.3 x 10(-13) sec (J = 0) and tau > 8.2 x 10(-13) sec (J = 1), at 90% C.L. C1 YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. CUNY CITY COLL,DEPT PHYS,NEW YORK,NY 10031. RP WU, XY (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 14 TC 17 Z9 17 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 SEP 21 PY 1992 VL 69 IS 12 BP 1729 EP 1732 DI 10.1103/PhysRevLett.69.1729 PG 4 WC Physics, Multidisciplinary SC Physics GA JN946 UT WOS:A1992JN94600004 ER PT J AU HENDERSON, SD ASOKAKUMAR, P GREENBERG, JS LYNN, KG MCCORKLE, S MCDONOUGH, J PHLIPS, BF WEBER, M AF HENDERSON, SD ASOKAKUMAR, P GREENBERG, JS LYNN, KG MCCORKLE, S MCDONOUGH, J PHLIPS, BF WEBER, M TI SEARCH IN S-CHANNEL FOR PRODUCTION OF 1-2 MEV/C(2) LONG-LIVED E(+)E(-) RESONANCES SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; BHABHA SCATTERING; NEUTRAL RESONANCES; MEV ENERGIES; POSITRON; DECAY; MASS AB The search for s-channel production of light neutral particles coupled to e+ e- has been extended by more than 3 orders of magnitude in lifetime beyond the region which is accessible to elastic e+ e-scattering. The whole mass range 1500 less than or similar to M(X0) less than or similar to 1860 keV/c2 suggested by the observation of anomalous e+ e- pairs in heavy-ion collisions has been investigated. These measurements find no evidence for e+ e- states within lifetime ranges (90% C.L.) of 1.4 x 10(-12) less than or similar to tau less than or similar to 4 x 10(-10) sec (J = 0) and 1.4 x 10(-12) less than or similar to tau less than or similar to 6 x 10(-10) sec (J = 1), assuming that the state does not break up by interacting within the target. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP HENDERSON, SD (reprint author), YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511, USA. NR 20 TC 17 Z9 17 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 SEP 21 PY 1992 VL 69 IS 12 BP 1733 EP 1736 DI 10.1103/PhysRevLett.69.1733 PG 4 WC Physics, Multidisciplinary SC Physics GA JN946 UT WOS:A1992JN94600005 ER PT J AU WANG, TF HENRY, EA BECKER, JA KUHNERT, A STOYER, MA YATES, SW BRINKMAN, MJ CIZEWSKI, JA MACCHIAVELLI, AO STEPHENS, FS DELEPLANQUE, MA DIAMOND, RM DRAPER, JE AZAIEZ, FA KELLY, WH KORTEN, W RUBEL, E AKOVALI, YA AF WANG, TF HENRY, EA BECKER, JA KUHNERT, A STOYER, MA YATES, SW BRINKMAN, MJ CIZEWSKI, JA MACCHIAVELLI, AO STEPHENS, FS DELEPLANQUE, MA DIAMOND, RM DRAPER, JE AZAIEZ, FA KELLY, WH KORTEN, W RUBEL, E AKOVALI, YA TI 1ST LIFETIME MEASUREMENT OF DIPOLE COLLECTIVE BANDS IN NEUTRON-DEFICIENT LEAD NUCLEI SO PHYSICAL REVIEW LETTERS LA English DT Article ID PB ISOTOPES; PB-198 AB Lifetimes of states in two DELTA-I = 1 bands in 198Pb have been measured using the Doppler-shift attenuation method. The in-band reduced transition probabilities are approximately 1-2 Weisskopf units, assuming magnetic dipole transitions. The measured lifetimes in conjunction with the partial level scheme support an oblate collective interpretation for these structures. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. UNIV KENTUCKY,LEXINGTON,KY 40506. COMIS NACL ENERGIA ATOM,RA-1429 BUENOS AIRES,DF,ARGENTINA. UNIV CALIF DAVIS,DAVIS,CA 95616. INST PHYS NUCL,F-91406 ORSAY,FRANCE. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. NIELS BOHR INST,COPENHAGEN,DENMARK. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP WANG, TF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI KORTEN, Wolfram/H-3043-2013; OI KORTEN, Wolfram/0000-0002-3940-0816 NR 22 TC 46 Z9 47 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 21 PY 1992 VL 69 IS 12 BP 1737 EP 1740 DI 10.1103/PhysRevLett.69.1737 PG 4 WC Physics, Multidisciplinary SC Physics GA JN946 UT WOS:A1992JN94600006 ER PT J AU FUCHS, BA SYN, C VELSKO, SP AF FUCHS, BA SYN, C VELSKO, SP TI DIAMOND TURNING OF LITHIUM-NIOBATE FOR OPTICAL APPLICATIONS SO APPLIED OPTICS LA English DT Article AB We have investigated the surfae finishing of lithium niobate by using the single-point diamond turning technique. Surface finishes of better than 5 nm rms on z-oriented samples have been achieved. However, tool wear and spalling are much more significant with lithium niobate than with materials such as the crystals KDP and LAP. We present preliminary results comparing the optical damage thresholds of polished and diamond-turned samples. RP FUCHS, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 17 TC 2 Z9 2 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1992 VL 31 IS 27 BP 5788 EP 5793 PG 6 WC Optics SC Optics GA JN788 UT WOS:A1992JN78800007 PM 20733767 ER PT J AU BIBEAU, C SPECK, DR EHRLICH, RB LAUMANN, CW KYRAZIS, DT HENESIAN, MA LAWSON, JK PERRY, MD WEGNER, PJ WEILAND, TL AF BIBEAU, C SPECK, DR EHRLICH, RB LAUMANN, CW KYRAZIS, DT HENESIAN, MA LAWSON, JK PERRY, MD WEGNER, PJ WEILAND, TL TI POWER, ENERGY, AND TEMPORAL PERFORMANCE OF THE NOVA LASER FACILITY WITH RECENT IMPROVEMENTS TO THE AMPLIFIER SYSTEM SO APPLIED OPTICS LA English DT Article DE ND-GLASS LASER; INERTIAL CONFINEMENT FUSION; NOVA LASER FACILITY ID SUPPRESSION; SCATTERING; GLASSES; LIGHT AB High-powered glass-laser systems with multiple beams, frequency-conversion capabilities, and pulse-shaping flexibility have made numerous contributions to the understanding of inertial confinement fusion and related laser-plasma interactions. The Nova laser at Lawrence Livermore National Laboratory is the largest such laser facility. We have made improvements to the Nova amplifier system that permit increased power and energy output. We summarize the nonlinear effects that now limit Nova's performance and discuss power and energy produced at 1.05-, 0.53-, and 0.35-mu-m wavelengths, including the results with pulses temporally shaped to improve inertial confinement fusion target performance. RP BIBEAU, C (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 35 TC 17 Z9 19 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1992 VL 31 IS 27 BP 5799 EP 5809 PG 11 WC Optics SC Optics GA JN788 UT WOS:A1992JN78800009 PM 20733769 ER PT J AU COFER, WR STEVENS, RK WINSTEAD, EL PINTO, JP SEBACHER, DI ABDULRAHEEM, MY ALSAHAFI, M MAZUREK, MA RASMUSSEN, RA CAHOON, DR LEVINE, JS AF COFER, WR STEVENS, RK WINSTEAD, EL PINTO, JP SEBACHER, DI ABDULRAHEEM, MY ALSAHAFI, M MAZUREK, MA RASMUSSEN, RA CAHOON, DR LEVINE, JS TI KUWAITI OIL FIRES - COMPOSITIONS OF SOURCE SMOKE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID BOREAL FOREST FIRES; EMISSIONS AB While the Kuwaiti oil-fire smoke plumes manifested a pronounced impact on solar radiation in the Gulf region (visibility, surface temperatures, etc.), smoke plume concentrations of combustion-generated pollutants suggest that the overall chemical impact on the atmosphere of the smoke from these fires was probably much less than anticipated. Combustion in the Kuwaiti oil fires was surprisingly efficient, releasing on average more than 93% of the combusted hydrocarbon fuels as carbon dioxide (CO2). Correspondingly, combustion-produced quantities of carbon monoxide (CO) and carbonaceous particles were low, each approximately 2% by weight. The fraction of methane (CH4) produced by the fires was also relatively low (approximately 0.2%), but source emissions of nonmethane hydrocarbons were high (approximately 2%). Processes other than combustion (e.g., volatilization) probably contributed significantly to the measured in-plume hydrocarbon concentrations. Substantially different elemental to organic carbon ratios were obtained for aerosol particles from several different types of fires/smokes. Sulfur emissions (particulate and gaseous) measured at the source fires were lower (approximately 0.5%) than predicted based on average sulfur contents in the crude. Sulfur dioxide measurements (SO2) reported herein, however, were both limited in actual number and in the number of well fires sampled. Nitrous oxide (N2O) emissions from the Kuwaiti oil fires were very low and often could not be distinguished from background concentrations. About 25-30% of the fires produced white smoke plumes that were found to be highly enriched in sodium and calcium chlorides. C1 US EPA,ATMOSPHER RES & EXPOSURE ASSESSMENT LAB,RES TRIANGLE PK,NC 27711. HUGHES STX CORP,HAMPTON,VA. KUWAIT ENVIRONM PROTECT DEPT,KUWAIT,KUWAIT. OREGON GRAD INST SCI & TECHNOL,GLOBAL CHANGE RES CTR,BEAVERTON,OR. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP COFER, WR (reprint author), NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23665, USA. NR 18 TC 16 Z9 16 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD SEP 20 PY 1992 VL 97 IS D13 BP 14521 EP 14525 PG 5 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JP896 UT WOS:A1992JP89600007 ER PT J AU RAGHAVACHARI, K ROHLFING, CM AF RAGHAVACHARI, K ROHLFING, CM TI GROUND-STATE OF C70O - OXYGEN BRIDGING AT THE EQUATORIAL BELT SO CHEMICAL PHYSICS LETTERS LA English DT Article ID BUCKMINSTERFULLERENE C60; FULLERENES; ADDUCTS; C84 AB Semi-empirical (MNDO) and ab initio Hartree-Fock (3-2 1 G) calculations on the structures and stabilities of C70O are reported. We have characterized eight isomers of C70O formed by an oxygen atom bridging each of the eight distinct C-C bonds in C70. The ground state isomer corresponds to oxygen bridging across an equatorial C-C bond in C70 which opens out to a distance of almost-equal-to 2.2 angstrom. This structure is different from the bridged paracyclene-like isomer proposed previously for C70O. Comparison is made between C70O and C60O. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP RAGHAVACHARI, K (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 20 TC 33 Z9 33 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 18 PY 1992 VL 197 IS 4-5 BP 495 EP 498 DI 10.1016/0009-2614(92)85806-L PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN548 UT WOS:A1992JN54800025 ER PT J AU MA, Z GUIOCHON, G AF MA, Z GUIOCHON, G TI SHOCK LAYER THICKNESS IN THE CASE OF WIDE BANDS OF SINGLE COMPONENTS AND BINARY-MIXTURES IN NONLINEAR LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID COMPETITIVE ADSORPTION-ISOTHERMS; PREPARATIVE CHROMATOGRAPHY; NONLINEAR CHROMATOGRAPHY; COMPUTER-SIMULATION; EXCHANGE SYSTEMS; MODELS; PROPAGATION; PROFILES AB The ideal model predicts the formation of a concentration shock on one side of an elution band, depending on the curvature of the isotherm. However, when a real column is used, a true concentration shock cannot form and a very steep boundary occurs instead, which is called a shock layer. It propagates at the same velocity as the ideal shock. The thickness of the shock layer has been defined and calculated by Rhee and co-workers in the case when the injection profile is a rectangular band wide enough for the elution profile to contain a constant state, i.e., a plateau at the injection composition. This result is used to investigate the properties of binary frontal analysis in chromatography. Experimental results are in good agreement with the theory. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 33 TC 9 Z9 9 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD SEP 18 PY 1992 VL 609 IS 1-2 BP 19 EP 33 DI 10.1016/0021-9673(92)80146-L PG 15 WC Chemistry, Analytical SC Chemistry GA JP887 UT WOS:A1992JP88700002 ER PT J AU FELINGER, A GUIOCHON, G AF FELINGER, A GUIOCHON, G TI OPTIMIZATION OF THE EXPERIMENTAL CONDITIONS AND THE COLUMN DESIGN PARAMETERS IN DISPLACEMENT CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID LIQUID-CHROMATOGRAPHY; COMPUTER-SIMULATION; SEPARATION; BAND; PROPAGATION; ELUTION AB Optimization of the experimental conditions (sample size, reduced mobile phase velocity and displacer concentration) and the column design parameters (column length and average particle size) was performed for the maximum production rate of either component of a binary mixture. The displacement chromatograms were calculated by means of the equilibrium-dispersive model of chromatography, assuming competitive Langmuir isotherms. Binary mixtures of separation factor 1.2, 1.5 and 1.8 and relative concentrations 3:1 and 1:3 were studied. For the systems studied, no optimum displacer concentration was found, the maximum production rates being achieved at the highest displacer concentration allowed by its solubility. The optimum column characteristics depend strongly on the separation factor and on the mixture composition. The maximum production rates were achieved at a much lower value of the retention factor than usually chosen in displacement chromatography. The optimum value of the retention factor of the less retained component was found to be between 1.2 and 2.0, depending slightly on the mixture composition and more strongly on the separation factor. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RI Felinger, Attila/A-1595-2008 OI Felinger, Attila/0000-0001-7130-1968 NR 24 TC 21 Z9 21 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD SEP 18 PY 1992 VL 609 IS 1-2 BP 35 EP 47 DI 10.1016/0021-9673(92)80147-M PG 13 WC Chemistry, Analytical SC Chemistry GA JP887 UT WOS:A1992JP88700003 ER PT J AU SMALL, GJ HAYES, JM SILBEY, RJ AF SMALL, GJ HAYES, JM SILBEY, RJ TI THE QUESTION OF DISPERSIVE KINETICS FOR THE INITIAL PHASE OF CHARGE SEPARATION IN BACTERIAL REACTION CENTERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID PHOTOSYNTHETIC REACTION CENTERS; PRIMARY ELECTRON-TRANSFER; RHODOPSEUDOMONAS-VIRIDIS; RHODOBACTER-SPHAEROIDES; ENERGY-TRANSFER; 3A RESOLUTION; DONOR STATE; SPECTROSCOPY AB Recently, femtosecond time domain data have raised the possibility that the kinetics of the initial phase of charge separation could be dispersive due to the glasslike structural heterogeneity of proteins. Guided by spectral hole burning data, we have derived simple theoretical rate expressions which allow the question posed in the title to be explored. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. MIT,DEPT CHEM,CAMBRIDGE,MA 02139. RP SMALL, GJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 27 TC 62 Z9 63 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 17 PY 1992 VL 96 IS 19 BP 7499 EP 7501 DI 10.1021/j100198a005 PG 3 WC Chemistry, Physical SC Chemistry GA JN952 UT WOS:A1992JN95200005 ER PT J AU XANTHEAS, SS DUNNING, TH AF XANTHEAS, SS DUNNING, TH TI STRUCTURES OF ANION WATER CLUSTERS - H-(H2O)N, N = 1-3 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ION AB The structures of hydride ion-water clusters with up to three water molecules have been computed using accurate ab initio techniques. The water molecules are not distributed symmetrically around the anion. Rather, they cluster on one side of the anion so as to retain a measure of hydrogen bonding. The calculated binding energies (including zero-point energies) for successive addition of water molecules to the hydride ion are 17.4, 14.8, and 13.7 kcal/mol. RP XANTHEAS, SS (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 16 TC 41 Z9 41 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 SEP 17 PY 1992 VL 96 IS 19 BP 7505 EP 7506 DI 10.1021/j100198a007 PG 2 WC Chemistry, Physical SC Chemistry GA JN952 UT WOS:A1992JN95200007 ER PT J AU YOO, CS GUPTA, YM AF YOO, CS GUPTA, YM TI SHOCK-INDUCED CHANGES AND VIBRONIC ANALYSIS OF THE 1AG-1LA ABSORPTION-BAND OF ANTHRACENE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PRESSURE; COMPRESSION AB The vibronic structure of the 1L(a) (or B-1(1u)) absorption band of anthracene in hexane has been examined under shock compression using a time-resolved spectroscopic method. The 1L(a) band shifts toward the red under shock compression, and the rate of the shift decreases monotonically as the pressure increases. Temperature effects of the shift are negligible. The red shift is likely due to dipole and induced-dipole interactions and is caused primarily by densification of the hexane solvent. Shock-induced changes are also analyzed using a simple vibronic analysis that incorporates a single harmonic oscillator model. Pressure-induced changes in the bandwidth, oscillator strength, and excited-state structure are presented. C1 WASHINGTON STATE UNIV,DEPT PHYS,PULLMAN,WA 99164. WASHINGTON STATE UNIV,SHOCK DYNAM LAB,PULLMAN,WA 99164. RP YOO, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 27 TC 4 Z9 4 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 17 PY 1992 VL 96 IS 19 BP 7555 EP 7560 DI 10.1021/j100198a014 PG 6 WC Chemistry, Physical SC Chemistry GA JN952 UT WOS:A1992JN95200014 ER PT J AU TUINMAN, AA MUKHERJEE, P ADCOCK, JL HETTICH, RL COMPTON, RN AF TUINMAN, AA MUKHERJEE, P ADCOCK, JL HETTICH, RL COMPTON, RN TI CHARACTERIZATION AND STABILITY OF HIGHLY FLUORINATED FULLERENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRONIC-STRUCTURES; C60F60; BUCKMINSTERFULLERENE; C60H60; C-60 AB Several procedures were used to fluorinate neat samples of C60 and mixtures of C60/C70. Both positive and negative ion mass Spectrometry showed C60FX and C70FY product mixtures, with X less-than-or-equal-to 48 and Y less-than-or-equal-to 56, representing the highest degree of fullerene substitution recorded by mass spectrometry to date. Small but significant differences are observed in the mass spectra obtained using field desorption, thermal deposition, and laser desorption ionization techniques, indicating facile loss of fluorine from the highly substituted fullerenes. Slow decomposition in C6F6 solution was also observed. Infrared and UV-vis absorption spectra of C60FX are also reported. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 19 TC 112 Z9 112 U1 0 U2 10 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 SEP 17 PY 1992 VL 96 IS 19 BP 7584 EP 7589 DI 10.1021/j100198a019 PG 6 WC Chemistry, Physical SC Chemistry GA JN952 UT WOS:A1992JN95200019 ER PT J AU BRAND, HV CURTISS, LA ITON, LE AF BRAND, HV CURTISS, LA ITON, LE TI COMPUTATIONAL STUDIES OF ACID SITES IN ZSM-5 - DEPENDENCE ON CLUSTER SIZE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MOLECULAR-ORBITAL METHODS; TEMPERATURE-PROGRAMMED DESORPTION; VALENCE BASIS-SETS; OH-GROUPS; INFRARED-SPECTROSCOPY; SURFACE HYDROXYLS; 2ND-ROW COMPOUNDS; ZEOLITES; FRAMEWORK; ABINITIO AB An ab initio molecular orbital study of the proton affinities, OH stretching frequencies, and ammonia interactions of SixTOyHz (T = Si, Al) clusters representing the ZSM-5 zeolite framework has been carried out. The dependence of these properties on cluster size was examined. The proton affinity of the central bridging Si-O-Al site was found to be slowly convergent with cluster size. In calculations on clusters containing up to two shells of silicons and two shells of oxygens beyond the bridge, the proton affinity varies by as much as 30 kcal/mol with each additional shell. Addition of a silicon shell reduces the proton affinity and addition of an oxygen shell increases the proton affinity. This is due to the long range electrostatic interaction of the added shells on the bridging hydroxyl site. The clusters containing a central Si-O-Si bridge exhibit a similar slow convergence of the proton affinity. The OH stretching frequencies are much less dependent on cluster size than the proton affinities. The theoretical proton affinities and OH stretching frequencies from the T = Al clusters are consistent with experiment. The interaction energy of the ''ionic'' structure that results from interaction of the ammonia with the acid site, Z-...HNH3+, has a slow convergence with cluster size similar to the proton affinity and the 'ionic'' structure increases in stability relative to the ''covalent'' structure, ZH...NH3, with increasing cluster size. The NH3 desorption energy is inversely proportional to the proton affinities of the clusters of the same size representing the ZSM-5 zeolite. C1 ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439. IIT,CHICAGO,IL 60616. NR 56 TC 132 Z9 133 U1 0 U2 10 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 SEP 17 PY 1992 VL 96 IS 19 BP 7725 EP 7732 DI 10.1021/j100198a044 PG 8 WC Chemistry, Physical SC Chemistry GA JN952 UT WOS:A1992JN95200044 ER PT J AU DUBA, A AF DUBA, A TI GEOPHYSICS - EARTHS CORE NOT SO HOT SO NATURE LA English DT Editorial Material ID MELTING CURVE; IRON RP DUBA, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 9 TC 11 Z9 11 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD SEP 17 PY 1992 VL 359 IS 6392 BP 197 EP 198 DI 10.1038/359197a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JN944 UT WOS:A1992JN94400038 ER PT J AU BRNICEVIC, N NOTHIGHUS, D KOJICPRODIC, B RUZICTOROS, Z DANILOVIC, Z MCCARLEY, RE AF BRNICEVIC, N NOTHIGHUS, D KOJICPRODIC, B RUZICTOROS, Z DANILOVIC, Z MCCARLEY, RE TI SYNTHESIS AND STRUCTURES OF HEXANUCLEAR TANTALUM CLUSTERS WITH THE [TA6CL12(CH3OH)6]3+ UNIT SO INORGANIC CHEMISTRY LA English DT Article ID NIOBIUM; COMPLEXES; METAL; CHEMISTRY; HALIDES; TA; BR AB Methods for the preparation of the new methanol-solvated cluster [Ta6Cl12(CH3OH)6]3+ have been devised and conditions established for obtaining the crystalline compounds [Ta6Cl12(CH3OH)6]X3, [Ta6Cl12(CH3OH)6]X3.4H2O, and [Ta6Cl12]X3.2H2O.4CH3OH, where X = Cl or Br. Usually the three compounds cocrystallized, and the conditions were chosen to enhance one of the compounds. X-ray crystal structure determinations were completed for [Ta6Cl12(CH3OH)6]Br3 (I) and [Ta6Cl12(CH3OH)6]Br3.4H2O (II). Crystal data for I: rhombohedral (hexagonal), space group R3BAR, a(H) = 19.127 (4) angstrom, c(H) = 8.565 (1) angstrom, V = 2713.6 (2) angstrom3, Z = 3, d(c) = 3.567 g cm-3, R = 0.030 (R(W) = 0.036) for 1898 unique reflections with I > 2-sigma(I). Crystal data for II: monoclinic, space group C2/m, a = 12.187 (14) angstrom, b = 15.793 (4) angstrom, c = 9.182 (6) angstrom, beta = 99.05 (3)-degrees, V = 1745.3 (1) angstrom3, Z = 2, d(c) = 3.835 g cm-3, R = 0.065 (R(w) = 0.074) for 1566 unique reflections with I > 2-sigma(I). Both I and II contain the [Ta6Cl12(H3OH)6]3+ cluster cation and Br- anions; in the case of II, H2O is hydrogen bonded in the lattice to both the coordinated CH3OH molecules and Br- anions. The average Ta-Ta bond distances for I, 2.9048 (1) angstrom, and for II, 2.898 (1) angstrom, are in good agreement with that previously reported for [Ta6Cl12(H2O)6]3+, 2.906 (1) angstrom, but about 0.04 angstrom shorter than those in complexes ligated in tie terminal positions with chloride or R3P. The average Ta-Cl (bridging) bond distance, 2.439 (5) angstrom in both I and II, is about the same as that reported for other [Ta6Cl12]3+ cluster compounds. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP BRNICEVIC, N (reprint author), RUDJER BOSKOVIC INST,YU-41001 ZAGREB,YUGOSLAVIA. NR 15 TC 15 Z9 15 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 16 PY 1992 VL 31 IS 19 BP 3924 EP 3928 DI 10.1021/ic00045a014 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JP056 UT WOS:A1992JP05600014 ER PT J AU WISHART, JF VANELDIK, R SUN, J SU, C ISIED, SS AF WISHART, JF VANELDIK, R SUN, J SU, C ISIED, SS TI HIGH-PRESSURE PULSE-RADIOLYSIS STUDY OF INTRAMOLECULAR AND INTERMOLECULAR REDUCTION OF CYTOCHROME-C BY RUTHENIUM(II) AMMINE COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID SPHERE ELECTRON-TRANSFER; SELF-EXCHANGE REACTION; AQUEOUS-SOLUTION; FERRICYTOCHROME-C; ACTIVATION; KINETICS; TEMPERATURE; VOLUMES; DEPENDENCE; HEXACYANOFERRATE(II) AB Volumes of activation for intra- and intermolecular electron transfer from ruthenium(II) ammine complexes to two types of cytochrome c were measured by pulse radiolysis using a portable, high-pressure optical cell. Electron-transfer rates were measured as a function of pressure from 1 to 1500 atm. The DELTA-V(double dagger) values for intramolecular electron transfer in (NH3)5Ru(II)-His33 horse heart ferricytochrome c and (NH3)5Ru(II)-His39 Candida krusei ferricytochrome c are -17.7 +/- 0.9 and -18.3 +/- 0.7 cm3 mol-1, respectively. For the intermolecular reaction between [Ru(NH3)6]2+ and horse heart ferricytochrome c, DELTA-V(double dagger) is -15.6 +/- 0.6 cm3 mol-1. The results indicate that the electron-transfer transition state is significantly more compact than the reactant state in both the intramolecular and intermolecular cases. Most of this volume change can be accounted for by an increase in solvent electrostriction at the ruthenium center. C1 UNIV WITTEN HERDECKE,INST INORGAN CHEM,W-5810 WITTEN,GERMANY. RUTGERS STATE UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08903. RP WISHART, JF (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 38 TC 34 Z9 34 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 16 PY 1992 VL 31 IS 19 BP 3986 EP 3989 DI 10.1021/ic00045a024 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JP056 UT WOS:A1992JP05600024 ER PT J AU GARCIA, E LEE, KY AF GARCIA, E LEE, KY TI STRUCTURE OF 3-AMINO-5-NITRO-1,2,4-TRIAZOLE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note ID 3-NITRO-1,2,4-TRIAZOL-5-ONE; SALT AB C2H3N5O2, M(r) = 129.1, monoclinic, C2/c, a = 14.199 (4), b = 4.844 (1), c = 14.258 (4) angstrom, beta = 105.98 (1)-degrees, V = 942.7 (4) angstrom3, Z = 8, D(x) = 1.819 Mg m-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 0.149 mm-1, F(000) = 528, room temperature, final R = 0.028 for 705 observed reflections [F > 5sigma(F)] out of 834 independent reflections. The ring geometry is very similar to other substituted 1,2,4-triazoles and is planar within 0.002 angstrom. The molecules are joined by N-H...N hydrogen bonds to form flat ribbons. Adjacent ribbons are joined by N-H...O hydrogen bonds. RP GARCIA, E (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 7 TC 18 Z9 18 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 SEP 15 PY 1992 VL 48 BP 1682 EP 1683 DI 10.1107/S010827019100375X PN 9 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JQ049 UT WOS:A1992JQ04900048 ER PT J AU GARCIA, E LEE, KY STORM, CB AF GARCIA, E LEE, KY STORM, CB TI STRUCTURE OF THE HYDRAZINIUM SALT OF 3-AMINO-5-NITRO-1,2,4-TRIAZOLE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note ID 3-NITRO-1,2,4-TRIAZOL-5-ONE AB Hydrazinium 3-amino-5-nitro-1,2,4-triazolide, N2H5+.C2H2N5O2, M(r) = 161.1, orthorhombic, Pbca, a = 5.392 (2), b = 13.316(2), c = 18.483 (6) angstrom, V = 1327.1 (7) angstrom3, Z = 8, D(x) 1.612 Mg m-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 0.130 mm-1, F(000) = 672, room temperature, final R = 0.030 for 717 observed reflections [F > 5sigma(F)] out of 1157 independent reflections. The ring geometry is very similar to other substituted 1,2,4-triazoles and is planar within 0.003 angstrom. The structure is held together by an extensive network of hydrogen bonds. RP GARCIA, E (reprint author), LOS ALAMOS NATL LAB,NMT-3,MS E511,LOS ALAMOS,NM 87545, USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD SEP 15 PY 1992 VL 48 BP 1683 EP 1685 DI 10.1107/S0108270191003773 PN 9 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JQ049 UT WOS:A1992JQ04900049 ER PT J AU DIACK, M HETTICH, RL COMPTON, RN GUIOCHON, G AF DIACK, M HETTICH, RL COMPTON, RN GUIOCHON, G TI CONTRIBUTION TO THE ISOLATION AND CHARACTERIZATION OF BUCKMINSTERFULLERENES SO ANALYTICAL CHEMISTRY LA English DT Article ID ICOSAHEDRAL C-60; C60 BUCKMINSTERFULLERENE; ELECTRONIC-STRUCTURE; CARBON; FULLERENES; MOLECULE; C70; CHROMATOGRAPHY; STABILITY; CLUSTERS AB Buckminsterfullerenes are extracted from samples of the soot generated by a high-energy electric arc discharge between two graphite electrodes. A rapid and quantitative procedure based on ultrasonic extraction was developed. It permits the evaluation of adjustments made in the different parameters involved in the synthesis process by relating them to the mass of the fractions obtained. Purified samples of C60, C70, and C84 are obtained by high-performance liquid chromatography, using chemically bonded C18 silica as the stationary phase and n-hexane as the mobile phase. The purified fullerenes were identified by laser desorption Fourier-transform mass spectrometry and verified by UV-visible spectroscopy. The results are consistent with those previously reported. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 33 TC 35 Z9 35 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 15 PY 1992 VL 64 IS 18 BP 2143 EP 2148 DI 10.1021/ac00042a020 PG 6 WC Chemistry, Analytical SC Chemistry GA JN432 UT WOS:A1992JN43200020 PM 19518043 ER PT J AU HEISE, TW YEUNG, ES AF HEISE, TW YEUNG, ES TI FLUORESCENCE IMAGING OF GAS-PHASE MOLECULES PRODUCED BY MATRIX-ASSISTED LASER DESORPTION SO ANALYTICAL CHEMISTRY LA English DT Letter ID MASS-SPECTROMETRY; GENERATED PLUMES; ENHANCED IONIZATION; SPECTROSCOPY; DISTRIBUTIONS C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 23 TC 14 Z9 14 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 15 PY 1992 VL 64 IS 18 BP 2175 EP 2179 DI 10.1021/ac00042a025 PG 5 WC Chemistry, Analytical SC Chemistry GA JN432 UT WOS:A1992JN43200025 PM 19518044 ER PT J AU APPELBAUM, FR BROWN, PA SANDMAIER, BM STORB, R FISHER, DR SHULMAN, HM GRAHAM, TC SCHUENING, FG DEEG, HJ BIANCO, JA KETRING, AR KAPLAN, D AF APPELBAUM, FR BROWN, PA SANDMAIER, BM STORB, R FISHER, DR SHULMAN, HM GRAHAM, TC SCHUENING, FG DEEG, HJ BIANCO, JA KETRING, AR KAPLAN, D TI SPECIFIC MARROW ABLATION BEFORE MARROW TRANSPLANTATION USING AN AMINOPHOSPHONIC ACID CONJUGATE HO-166-EDTMP SO BLOOD LA English DT Article ID 2 IRRADIATION REGIMENS; MYELOID-LEUKEMIA; RANDOMIZED TRIAL C1 UNIV WASHINGTON, SCH MED, SEATTLE, WA 98195 USA. UNIV MISSOURI, COLUMBIA, MO 65201 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. DOW CHEM CO USA, MIDLAND, MI 48640 USA. RP APPELBAUM, FR (reprint author), FRED HUTCHINSON CANC RES CTR, RM M318, 1124 COLUMBIA ST, SEATTLE, WA 98104 USA. FU NCI NIH HHS [CA18105, CA31787, CA44991] NR 10 TC 23 Z9 23 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD SEP 15 PY 1992 VL 80 IS 6 BP 1608 EP 1613 PG 6 WC Hematology SC Hematology GA JN507 UT WOS:A1992JN50700033 PM 1520886 ER PT J AU LUTZE, LH WINEGAR, RA JOSTES, R CROSS, FT CLEAVER, JE AF LUTZE, LH WINEGAR, RA JOSTES, R CROSS, FT CLEAVER, JE TI RADON-INDUCED DELETIONS IN HUMAN-CELLS - ROLE OF NONHOMOLOGOUS STRAND REJOINING SO CANCER RESEARCH LA English DT Note ID SHORT SEQUENCE HOMOLOGIES; IONIZING-RADIATION; MAMMALIAN-CELLS; DNA; RECOMBINATION; DEFICIENCY; MUTATIONS; PLASMID; INVITRO; VECTOR AB Radon is a ubiquitous inhaled human carcinogen that is thought to be the largest single natural source of human exposure to radiation: We report that a freely replicating episome in human cells exposed to radon gas underwent mutagenic changes, a high proportion of which were large deletions involving many thousands of base pairs. These deletions were not randomly distributed but started and ended in defined regions as if caused by the passage of a single alpha-particle track through a coiled chromatin structure. The sizes appeared to be defined by structural features of chromatin: the minimum size was 2435 base pairs, and the maximum size was 8051 base pairs, close to the upper limit that would leave intact the plasmid sequences required for selection in bacteria. Ends were rejoined by nonhomologous recombination involving up to 6 base pairs of homology. This process may not be confined to the repair of exogenously induced double-strand breaks but may be used for rejoining free DNA ends generated by a variety of cellular processes. The mechanism of alpha-particle deletion mutagenesis may account for the high relative biological effectiveness of radon irradiation for many end points and its consequences for lung carcinogenesis. C1 SRI INT, MENLO PK, CA 94025 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP LUTZE, LH (reprint author), UNIV CALIF SAN FRANCISCO, RADIOBIOL & ENVIRONM HLTH LAB, SAN FRANCISCO, CA 94143 USA. FU NIGMS NIH HHS [R29 GM46563-01] NR 21 TC 18 Z9 18 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD SEP 15 PY 1992 VL 52 IS 18 BP 5126 EP 5129 PG 4 WC Oncology SC Oncology GA JN053 UT WOS:A1992JN05300047 PM 1516071 ER PT J AU PARISE, JB HARLOW, RL SHANNON, RD KWEI, GH ALLIK, TH ARMSTRONG, JT AF PARISE, JB HARLOW, RL SHANNON, RD KWEI, GH ALLIK, TH ARMSTRONG, JT TI CRYSTAL-STRUCTURE AND ELECTRON-MICROPROBE ANALYSES OF A LANTHANUM LUTETIUM GALLIUM GARNET SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Single-crystal electron microprobe analysis of a lanthanum lutetium gallium garnet has resulted in a composition of La2.37Nd0.07Pb0.01Lu2.54Cr0.01Ga3.00O12. This composition gives better agreement between observed and calculated total dielectric polarizabilities than previously reported compositions (La2.26-2.32Nd0.04Lu2.57-2.63Ga3.07O12 by x-ray fluorescence and La2.655Nd0.027Lu2.656Ga2.655O12 by inductively coupled plasma analyses), and does not imply the crystal-chemically improbable presence of Lu3+ in the tetrahedral site. X-ray and neutron crystal-structure analyses have confirmed that little or no Lu resides in this site. C1 LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. SCI APPLICAT INT CORP,MCLEAN,VA 22102. CALTECH,DEPT GEOL & PLANETARY SCI,PASADENA,CA 91125. RP PARISE, JB (reprint author), DUPONT CO,DEPT CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880, USA. NR 15 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1992 VL 72 IS 6 BP 2152 EP 2155 DI 10.1063/1.351604 PG 4 WC Physics, Applied SC Physics GA JN512 UT WOS:A1992JN51200010 ER PT J AU NADELLA, RK VELLANKI, J RAO, MV HOLLAND, OW AF NADELLA, RK VELLANKI, J RAO, MV HOLLAND, OW TI MEV B-COMPENSATION IMPLANTS INTO N-TYPE GAAS AND INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HIGH-RESISTIVITY LAYERS; NITROGEN ION-IMPLANTATION; RUTHERFORD BACKSCATTERING; BORON IMPLANTATION; FE; BOMBARDMENT AB High energy B implantations were performed into n-type GaAs and InP at room temperature in the range of energies from 1 to 5 MeV and fluences from 10(11) to 10(16) cm-2. The material did not become amorphous for any of the fluences used. Buried layers with resistivities as high as 10(8) OMEGA cm and 10(6) OMEGA cm were obtained in GaAs and InP, respectively, after heat treatments. The breakdown voltages corresponding to the highest resistivities are 80 and 35 V, respectively, in GaAs and InP. In GaAs, the Rutherford backscattering analysis on the annealed samples showed an aligned yield close to that of a virgin sample, whereas, the yield in InP is more than that of the as-implanted sample. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP GEORGE MASON UNIV, DEPT ELECT & COMP ENGN, FAIRFAX, VA 22030 USA. NR 27 TC 17 Z9 17 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1992 VL 72 IS 6 BP 2179 EP 2184 DI 10.1063/1.351608 PG 6 WC Physics, Applied SC Physics GA JN512 UT WOS:A1992JN51200015 ER PT J AU LUO, JS MERCHANT, N MARONI, VA GRUEN, DM TANI, BS CARTER, WL RILEY, GN SANDHAGE, KH AF LUO, JS MERCHANT, N MARONI, VA GRUEN, DM TANI, BS CARTER, WL RILEY, GN SANDHAGE, KH TI THERMOSTABILITY AND DECOMPOSITION OF THE (BI,PB)2SR2CA2CU3O10 PHASE IN SILVER-CLAD TAPES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CU-O SYSTEM; CRITICAL CURRENTS; WIRES AB The stability of the Bi2-xPbxSr2Ca2Cu3O10 (Pb-2223) phase contained in silver-sheathed oxide-powder-in-tube specimens has been investigated by x-ray diffraction, transmission electron microscopy, and energy dispersive x-ray analysis. Silver tubes loaded with Pb-2223 precursor powders were processed into tapes using established metallurgical techniques. The tapes were heat-treated in a specially designed equilibration apparatus at selected temperatures (800-845-degrees-C) for a range of times (10-5500 min) and quenched in liquid gallium held at approximately 40-degrees-C. The results showed that the Pb-2223 phase is stable in a limited temperature interval between 810 and 830-degrees-C in 7.5% oxygen. At 800-degrees-C, this phase decomposes to Bi2Sr2CaCu2O8 (2212), Ca2PbO4, and CuO; while at temperatures greater-than-or-equal-to 840-degrees-C it partially melts with precipitation of Bi2Sr2CuO6 (2201) and Ca2CuO3. The effects of the silver cladding on the Pb-2223 phase stability and microstructure are also discussed. C1 AMER SUPERCONDUCTOR CORP,WATERTOWN,MA 02172. RP LUO, JS (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 18 TC 46 Z9 46 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 SEP 15 PY 1992 VL 72 IS 6 BP 2385 EP 2389 DI 10.1063/1.351581 PG 5 WC Physics, Applied SC Physics GA JN512 UT WOS:A1992JN51200042 ER PT J AU LANDGRAF, BE GOLDSTEIN, B WILLIAMS, DP MURPHY, JR SANA, TR SMITH, KA CIARDELLI, TL AF LANDGRAF, BE GOLDSTEIN, B WILLIAMS, DP MURPHY, JR SANA, TR SMITH, KA CIARDELLI, TL TI RECOMBINANT INTERLEUKIN-2 ANALOGS - DYNAMIC PROBES FOR RECEPTOR STRUCTURE SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID GROWTH-FACTOR RECEPTORS; BETA-CHAIN; MOLECULAR-CLONING; ALPHA-CHAIN; BINDS INTERLEUKIN-2; GM-CSF; EXPRESSION; IL-2; IDENTIFICATION; SUBUNIT AB Interleukin-2 (IL-2) and its receptor complex have become one of the most studied members of a growing family of protein hormones characterized by structural similarities in both ligands and their receptors. Structure-function studies of IL-2 have been complicated by the multimeric nature of its receptor. Two receptor subunits (55- and 75-kDa type I cell surface proteins) can participate to form the high affinity binding site. Although the IL-2 is apparently unique in some respects, similar subunit cooperativity has now been shown to be a common feature for other members of this receptor family. The availability of cell lines expressing the individual IL-2 receptor subunits has allowed detailed analysis of subunit binding characteristics. Results regarding the relationship of molecular recognition at each subunit to the mechanism of ligand binding at the high affinity site, however, have led to different interpretations. In this study we have employed previously prepared C-terminal IL-2 mutant proteins to examine receptor binding at all three classes using a variety of equilibrium and kinetic techniques. These results indicate that the high affinity IL-2 receptor complex includes the p55/p75 heterodimer prior to IL-2 binding and that both receptor subunits participate simultaneously in ligand capture. C1 DARTMOUTH COLL,HITCHCOCK MED CTR,DARTMOUTH MED SCH,DEPT PHARMACOL & TOXICOL,HANOVER,NH 03756. DARTMOUTH COLL,HITCHCOCK MED CTR,DARTMOUTH MED SCH,DEPT MED,HANOVER,NH 03756. CYTOMED INC,CAMBRIDGE,MA 02139. LOS ALAMOS NATL LAB,DIV THEORET,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. SERAGEN INC,HOPKINTON,MA 01748. BOSTON UNIV HOSP,MED CTR,DEPT BIOMOLEC MED,BOSTON,MA 02218. VET ADM MED CTR,WHITE RIVER JCT,VT 05001. FU NCI NIH HHS [CA4176, CA17643]; NIAID NIH HHS [AI23398] NR 56 TC 36 Z9 36 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 15 PY 1992 VL 267 IS 26 BP 18511 EP 18519 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JN502 UT WOS:A1992JN50200044 PM 1526987 ER PT J AU CONBOY, JG COX, TC BOTTOMLEY, SS BAWDEN, MJ MAY, BK AF CONBOY, JG COX, TC BOTTOMLEY, SS BAWDEN, MJ MAY, BK TI HUMAN ERYTHROID 5-AMINOLEVULINATE SYNTHASE - GENE STRUCTURE AND SPECIES-SPECIFIC DIFFERENCES IN ALTERNATIVE RNA SPLICING SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID DELTA-AMINOLEVULINATE SYNTHASE; MAMMALIAN-CELLS; MESSENGER-RNA; X-CHROMOSOME; PROTEIN 4.1; EXPRESSION; DIFFERENTIATION; ANKYRIN; CDNA; ISOFORMS AB Erythroid 5-aminolevulinate synthase (ALAS) is expressed exclusively in differentiating erythroid cells as the principal isoform of the enzyme to catalyze the first step of the heme biosynthetic pathway. The human gene encoding this isozyme was isolated from a cosmid library, and its structure was characterized with restriction mapping followed by sequencing of fragments. The gene is 22 kilobases long and has 11 exons. Exon 2 encodes the N-terminal signal sequence required for mitochondrial import, exons 3 and 4 encode a variable portion of the N-terminal end, and exons 5-11 the highly conserved C-terminal portion of the mature protein, respectively. Enzymatic amplification of human reticulocyte RNA using PCR techniques revealed two erythroid ALAS mRNA transcripts predicted to encode both the prototypical 64-kDa isoform as well as a novel smaller isoform with a deletion of 37 amino acids near the N terminus. The two mRNA isoforms are generated by alternative splicing of exon 4 and are expressed in fetal erythroid cells as well as at all stages of erythroid development tested, so that there is no evidence of differentiation-specific regulation of exon 4 splicing. However, striking species-specific differences were observed in that alternative splicing of exon 4 was found in man but not dog or mouse; also, the previously described alternative splicing within exon 3 in mouse was not observed in man. This transcript heterogeneity suggests the existence of erythroid ALAS protein isoforms with potentially distinct functional or regulatory roles. The occurrence of species-specific splicing in the least conserved region of the enzyme may reflect another mechanism of gene evolution in eukaryotes. C1 LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. UNIV OKLAHOMA,COLL MED,DEPT MED,OKLAHOMA CITY,OK 73104. VET AFFAIRS MED CTR,OKLAHOMA CITY,OK 73104. RP CONBOY, JG (reprint author), UNIV ADELAIDE,DEPT BIOCHEM,ADELAIDE,SA 5001,AUSTRALIA. FU NHLBI NIH HHS [HL 45182] NR 34 TC 58 Z9 58 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 15 PY 1992 VL 267 IS 26 BP 18753 EP 18758 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JN502 UT WOS:A1992JN50200077 PM 1527005 ER PT J AU RADFORD, HE WEI, W SEARS, TJ AF RADFORD, HE WEI, W SEARS, TJ TI THE ROTATIONAL SPECTRUM OF TRANS-HOCO AND DOCO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HYPERFINE COUPLING-CONSTANTS; VIBRONIC STRUCTURE; C2H SPECTRUM AB Part of the rotational spectrum of the hydroxyformyl radical, HOCO, and its deuterated analog has been detected at frequencies between 230 and 300 GHz. The radical was formed in a flow system by the reaction between chlorine atoms and formic acid. Analysis of the spectra yields reliable estimates of the rotational, centrifugal distortion and spin-rotational parameters describing the ground state of this species. The rotational constants derived for HOCO and DOCO are consistent with a planar equilibrium structure and are used to confirm that the carrier of the spectrum is the trans-geometrical isomer. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP RADFORD, HE (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 15 TC 54 Z9 54 U1 2 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 SEP 15 PY 1992 VL 97 IS 6 BP 3989 EP 3995 DI 10.1063/1.462938 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN146 UT WOS:A1992JN14600013 ER PT J AU SEARS, TJ FAWZY, WM JOHNSON, PM AF SEARS, TJ FAWZY, WM JOHNSON, PM TI TRANSIENT DIODE-LASER ABSORPTION-SPECTROSCOPY OF THE NU-2 FUNDAMENTAL OF TRANS-HOCO AND DOCO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STATE DISTRIBUTION; INFRARED-SPECTRUM; ISOCYANIC ACID; OH; CO; H+CO2->OH+CO; PHOTOLYSIS; H+CO2; BAND; CD3 AB We report the observation and assignment of the nu-2 fundamental vibration in the HOCO and DOCO radicals. The radical was made by the photolysis of acetic acid or acetic acid-d at 193 nm in a flow system. The observed spectra indicate that the excited vibrational level is perturbed in both HOCO and DOCO. In HOCO, the rotational levels in nu-2 = 1 have an irregular dependence on the K(a) quantum number, probably caused by anharmonic interactions with combinations of lower frequency in plane vibrations. An alpha-type Coriolis interaction involving perturbation by a level containing one quantum of the out-of-plane torsional vibration cannot be rigorously excluded however. In DOCO, there are also N-dependent perturbations in the excited state. Only parallel transitions were assigned in the nu-2 fundamental of both isotopomers. The K = 0 band origin for HOCO is at 1852.567 cm-1 which compares with 1843.7 cm-1 reported previously for the radical trapped in a low-temperature argon matrix. This absorption spectrum will be useful in future studies of chemical reactions involving the radical. C1 SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794. RP SEARS, TJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 30 TC 80 Z9 80 U1 2 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 SEP 15 PY 1992 VL 97 IS 6 BP 3996 EP 4007 DI 10.1063/1.462939 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN146 UT WOS:A1992JN14600014 ER PT J AU CROMWELL, EF STOLOW, A VRAKKING, MJJ LEE, YT AF CROMWELL, EF STOLOW, A VRAKKING, MJJ LEE, YT TI DYNAMICS OF ETHYLENE PHOTODISSOCIATION FROM ROVIBRATIONAL AND TRANSLATIONAL ENERGY-DISTRIBUTION OF H-2 PRODUCTS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID VINYLIDENE B-3(2); PHOTOLYSIS; STATES; SPECTROSCOPY; ABSORPTION; SPECTRUM AB The dynamics of H-2 elimination from ethylene was studied via a pump and probe technique utilizing an ultrahigh resolution vacuum ultraviolet laser system. H-2 product internal and translational energy distributions were obtained for the photodissociation at 193 nm. The distribution of energy in H-2 product from the dissociation of (1,1)-dideuteroethylene is also presented. Two separate H-2 elimination channels are inferred: a 1,1 elimination producing the vinylidene radical and a 1,2 elimination producing the acetylene molecule. Differences between the vibrational, rotational, and translational energy distributions for these two channels are discussed and correlations between product internal and translational energy are presented. A comparison with ab initio calculations of the transition state configurations for these processes is made. We suggest that the H-2 elimination process may be nonstatistical in nature. The D atom elimination from C2D4 was examined and kinetic energy distribution for this product measured. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP CROMWELL, EF (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 38 TC 78 Z9 78 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 15 PY 1992 VL 97 IS 6 BP 4029 EP 4040 DI 10.1063/1.462942 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN146 UT WOS:A1992JN14600017 ER PT J AU SUITS, AG DEPUJO, P SUBLEMONTIER, O VISTICOT, JP BERLANDE, J CUVELLIER, J GUSTAVSSON, T MESTDAGH, JM MEYNADIER, P LEE, YT AF SUITS, AG DEPUJO, P SUBLEMONTIER, O VISTICOT, JP BERLANDE, J CUVELLIER, J GUSTAVSSON, T MESTDAGH, JM MEYNADIER, P LEE, YT TI THE DYNAMICS OF ELECTRONIC TO VIBRATIONAL, ROTATIONAL, AND TRANSLATIONAL ENERGY-TRANSFER IN COLLISION OF BA(P-1(1)) WITH DIATOMIC-MOLECULES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FINE-STRUCTURE TRANSITIONS; DOPPLER SPECTROSCOPY; PHOTODISSOCIATION DYNAMICS; RARE-GASES; NA-STAR; ATOMS; BEAM; DEPENDENCE; SCATTERING; N-2 AB Doppler measurements taken over a range of probe-laser angles in a crossed-beam experiment were used, in conjunction with forward convolution analysis, to obtain flux-velocity contour maps for Ba(3P2) produced in a collision of Ba(1P1) with H-2, N2, O2, and NO. The contour maps suggest a general model for the dynamics of this process in which large impact parameter collisions result in a near-resonant transfer of initial electronic energy into final vibrational energy, while close collisions produce sideways scattering and effectively couple electronic energy to translation. The molecular collision partners fall into two categories: for one group, comprising O2 and NO, the existence of a well-defined molecular anion with favorable Franck-Condon factors linking excited vibrational levels to the ground vibrational state of the neutral results in greatly enhanced coupling for the near-resonant process. Molecules for which there exist no stable anions, such as N2 and H-2, represent a second category. The electronically inelastic collision for this group is instead dominated by the nonresonant process yielding the ground vibrational state and large translational energy release. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP MESTDAGH, JM (reprint author), CENS,SERV PHOTONS ATOMES & MOLEC,F-91191 GIF SUR YVETTE,FRANCE. RI Gustavsson, Thomas/B-1702-2009; Lee, Yuan-Tseh/F-7914-2012; Visticot, Jean-Paul/D-4058-2009 OI Gustavsson, Thomas/0000-0001-7030-6812; Visticot, Jean-Paul/0000-0003-1055-4827 NR 48 TC 10 Z9 10 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 15 PY 1992 VL 97 IS 6 BP 4094 EP 4103 DI 10.1063/1.463914 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN146 UT WOS:A1992JN14600023 ER PT J AU FOURNIER, R SINNOTT, SB DEPRISTO, AE AF FOURNIER, R SINNOTT, SB DEPRISTO, AE TI DENSITY FUNCTIONAL-STUDY OF THE BONDING IN SMALL SILICON CLUSTERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID INTERATOMIC FORCE-FIELDS; MOLECULAR-DYNAMICS SIMULATION; CAS SCF/CI CALCULATIONS; BEAM EPITAXIAL-GROWTH; ELECTRONIC-STRUCTURES; LINEAR COMBINATION; GROUND-STATE; BULK PHASES; ENERGY; SI AB We report the ground electronic state, equilibrium geometry, vibrational frequencies, and binding energy for various isomers of Si(n)(n = 2-8) obtained with the linear combination of atomic orbitals-density functional method. We used both a local density approximation approach and one with gradient corrections. Our local density approximation results concerning the relative stability of electronic states and isomers are in agreement with Hartree-Fock and Moller-Plesset (MP2) calculations [K. Raghavachari and C. M. Rohlfing, J. Chem. Phys. 89, 2219 (1988)]. The binding energies calculated with the gradient corrected functional are in good agreement with experiment (Si2 and Si3) and with the best theoretical estimates. Our analysis of the bonding reveals two limiting modes of bonding and classes of silicon clusters. One class of clusters is characterized by relatively large s atomic populations and a large number of weak bonds, while the other class of clusters is characterized by relatively small s atomic populations and a small number of strong bonds. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RI Sinnott, Susan/P-8523-2014 OI Sinnott, Susan/0000-0002-3598-0403 NR 81 TC 127 Z9 128 U1 0 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 SEP 15 PY 1992 VL 97 IS 6 BP 4149 EP 4161 DI 10.1063/1.463918 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN146 UT WOS:A1992JN14600028 ER PT J AU SHIH, MC BOHANON, TM MIKRUT, JM ZSCHACK, P DUTTA, P AF SHIH, MC BOHANON, TM MIKRUT, JM ZSCHACK, P DUTTA, P TI X-RAY-DIFFRACTION STUDY OF HENEICOSANOL MONOLAYERS ON THE SURFACE OF WATER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CHAIN FATTY-ACIDS; ROTATOR PHASE AB We have studied Langmuir monolayers of CH3(CH2)20OH (heneicosanol) using x-ray diffraction. Over the temperature range 7-55-degrees-C, the monolayer isotherms show only one discontinuity, which may be either a "flat section" or a "kink;" we find that these are transitions between tilted and untilted phases. There are several untilted phases, with hexagonal and distorted-hexagonal structures, as in monolayers of the corresponding (heneicosanoic) acid. However, in contrast to the acid, when the pressure is lowered the molecules tilt only towards a next-nearest neighbor. The dependence of the lattice spacings on pressure and temperature indicate that the monolayer does not form a "tilted hexagonal" phase, even at temperatures where the untilted phase is hexagonal (rotator-II). C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37830 USA. RP SHIH, MC (reprint author), NORTHWESTERN UNIV, DEPT PHYS & ASTRON, EVANSTON, IL 60208 USA. NR 15 TC 58 Z9 58 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 SEP 15 PY 1992 VL 97 IS 6 BP 4485 EP 4488 DI 10.1063/1.463891 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JN146 UT WOS:A1992JN14600062 ER PT J AU SUGAMA, T CARCIELLO, NR GRAY, G AF SUGAMA, T CARCIELLO, NR GRAY, G TI ALKALI CARBONATION OF CALCIUM ALUMINATE CEMENTS - INFLUENCE OF SET-RETARDING ADMIXTURES UNDER HYDROTHERMAL CONDITIONS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID HYDROXYCARBOXYLIC-ACID RETARDERS; SALICYLIC ACID; MINERALS AB The preferential uptake of aluminium ions by lactone and carboxylic acid groups in glucuronic-6,3-lactone and gluconic acid suggested that these organic admixtures have a high potential as set-retarding admixtures of high-temperature calcium aluminate cement slurry. However, the liberation of abundant free calcium ions caused by the adsorption of aluminium ions by the admixtures, increased the carbonation rate of hydrated cement pastes after exposure to Na2CO3-laden water at 300-degrees-C. Using inorganic acid admixtures, such as boric acid and sodium tetraborate decahydrate, the retarding ability of colloidal Ca(BO2)2.nH2O and aluminium hydroxide yielded by the reaction between admixture and cement was less than that of the reaction products derived from organic acid admixtures. Although Ca(BO2)2.nH2O in hot Na2CO3 solution was converted into CaCO3, the rate of alkali carbonation was almost the same as that of admixture-free calcium aluminate cement pastes. C1 BROOKHAVEN NATL LAB,DIV CONSERVAT,UPTON,NY 11973. MIT,DEPT MECH ENGN,CAMBRIDGE,MA 02139. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI ENERGY EFFICIENCY,UPTON,NY 11973, USA. NR 21 TC 2 Z9 2 U1 2 U2 5 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD SEP 15 PY 1992 VL 27 IS 18 BP 4909 EP 4916 DI 10.1007/BF01105253 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA JP867 UT WOS:A1992JP86700010 ER PT J AU NEUFFER, D COLTON, E FITZGERALD, D HARDEK, T HUTSON, R MACEK, R PLUM, M THIESSEN, H WANG, TS AF NEUFFER, D COLTON, E FITZGERALD, D HARDEK, T HUTSON, R MACEK, R PLUM, M THIESSEN, H WANG, TS TI OBSERVATIONS OF A FAST TRANSVERSE INSTABILITY IN THE PSR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A fast instability with beam loss is observed in the Los Alamos Proton Storage Ring (PSR) when the injected beam current exceeds a threshold value, with both bunched and unbunched beams. Large coherent transverse oscillations occur prior to and during beam loss. The threshold depends strongly on rf voltage, beam-pulse shape, beam size, nonlinear fields, and beam environmental. Results of recent observations of the instability are reported; possible causes of the instability are discussed. Recent measurements and calculations indicate that the instability is an "e-p"-type instability, driven by coupled oscillations with electrons trapped within the proton beam. Future experiments toward further understanding of the instability are discussed, and methods of increasing PSR beam storage are suggested. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 12 TC 77 Z9 77 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 15 PY 1992 VL 321 IS 1-2 BP 1 EP 12 DI 10.1016/0168-9002(92)90371-A PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000001 ER PT J AU MANE, SR AF MANE, SR TI POLARIZATION OF ELECTRON-BEAMS IN HIGH-ENERGY STORAGE-RINGS .1. CONVERGENCE OF PERTURBATION-THEORY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID EQUILIBRIUM POLARIZATION; RESONANCES AB The spin resonances in high energy electron storage rings are calculated using perturbation theory, for various model storage rings, and the results are compared against analytical formulas (in the case of higher order synchrotron resonances), to elucidate the convergence of the perturbation series. A new analytical formula for synchrotron resonances centered on an integer is also derived, because it is shown that the older formula contains approximations not always valid in modern storage rings. The perturbation series is shown to converge and to agree with the analytical formulas, and the number of terms required for convergence is estimated. Some other pedagogical results are also presented. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 20 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 15 PY 1992 VL 321 IS 1-2 BP 21 EP 41 DI 10.1016/0168-9002(92)90374-D PG 21 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000004 ER PT J AU MANE, SR AF MANE, SR TI POLARIZATION OF ELECTRON-BEAMS IN HIGH-ENERGY STORAGE-RINGS .2. SERIES EXPANSION WITH TUNE MODULATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID EQUILIBRIUM POLARIZATION; RESONANCES AB A modified formulation of perturbation theory to calculate the spin resonances in high energy storage rings is described. It combines the features of series expansions in powers of the orbital oscillation amplitudes and tune modulation techniques, to treat higher order spin resonances, especially the higher order synchrotron sideband resonances. The new method converges much faster than a direct series expansion for ali the resonances, and can deal with strong tune modulation (tune modulation index greater than unity) without requiring extremely high degrees of spin integrals. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 15 PY 1992 VL 321 IS 1-2 BP 42 EP 47 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000005 ER PT J AU PILE, PH BEAVIS, D BROWN, RL CHRIEN, R DANBY, G JACKSON, J LAZARUS, DM LEONHARDT, W PEARSON, C PENDZICK, A MONTEMURRO, P RUSSO, T SANDBERG, J SAWAFTA, R SPATARO, C WALKER, J ENGE, HA AF PILE, PH BEAVIS, D BROWN, RL CHRIEN, R DANBY, G JACKSON, J LAZARUS, DM LEONHARDT, W PEARSON, C PENDZICK, A MONTEMURRO, P RUSSO, T SANDBERG, J SAWAFTA, R SPATARO, C WALKER, J ENGE, HA TI A NEW 1-2 GEV/C SEPARATED BEAM FOR BNL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID KEK AB A 1-2 GeV/c beam line has been constructed at the Brookhaen National Laboratory alternating gradient synchrotron (BNL AGS). The beam line is optimized to deliver an intense clean beam of 1.8 GeV/c negative kaons for an H particle search experiment and incorporates two stages of velocity selection with the magnetic optics corrected to third order. Details of the beam line design as well as results of the commissioning will be discussed. C1 MIT,CAMBRIDGE,MA 02139. RP PILE, PH (reprint author), BROOKHAVEN NATL LAB ASSOCIATED UNIV INC,UPTON,NY 11973, USA. NR 19 TC 45 Z9 46 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 SEP 15 PY 1992 VL 321 IS 1-2 BP 48 EP 58 DI 10.1016/0168-9002(92)90376-F PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000006 ER PT J AU AKER, E AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BECKMANN, R BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BUGG, DV BURCHELL, M CASE, T CIERJACKS, S CROWE, KM DEDERICHS, K DOSER, M DUNNWEBER, W EMERICH, H ENGELHARDT, D FAESSLER, MA FELIX, C FOLGER, G FRIEDRICH, J HACKMANN, R HADDOCK, R HAMMER, H HEINSIUS, F HESSEY, NP ILLINGER, P JAMNIK, D KALINOWSKY, H KAMMLE, B KIEL, T KLEMPT, E KOCH, H KOLO, C KONIGSMANN, K KRENNRICH, F KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K ROHRBACH, W SANJARI, AH SCHAFER, E SCHMID, B SCHOTT, W SIDIROPOULOS, K SPANIER, S STAUDE, A STRASSBURGER, C STROHBUSCH, U SUFFERT, M SUTTON, C URNER, D VOLCKER, C WALTHER, D WALTHER, S WEDDIGEN, C WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AKER, E AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BECKMANN, R BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BUGG, DV BURCHELL, M CASE, T CIERJACKS, S CROWE, KM DEDERICHS, K DOSER, M DUNNWEBER, W EMERICH, H ENGELHARDT, D FAESSLER, MA FELIX, C FOLGER, G FRIEDRICH, J HACKMANN, R HADDOCK, R HAMMER, H HEINSIUS, F HESSEY, NP ILLINGER, P JAMNIK, D KALINOWSKY, H KAMMLE, B KIEL, T KLEMPT, E KOCH, H KOLO, C KONIGSMANN, K KRENNRICH, F KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K ROHRBACH, W SANJARI, AH SCHAFER, E SCHMID, B SCHOTT, W SIDIROPOULOS, K SPANIER, S STAUDE, A STRASSBURGER, C STROHBUSCH, U SUFFERT, M SUTTON, C URNER, D VOLCKER, C WALTHER, D WALTHER, S WEDDIGEN, C WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI THE CRYSTAL BARREL SPECTROMETER AT LEAR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ENERGY ANTIPROTON PHYSICS; ISOSCALAR MESON AX(1565); PBAR-P-ATOM; DRIFT CHAMBER; ANNIHILATION; STATES; CALORIMETER; RESONANCE AB The Crystal Barrel spectrometer used at LEAR, CERN to study the products of ppBAR and pdBAR annihilations is described. A 1380 element array of CsI crystals measures photons from the decay of pi0, eta, eta' and omega mesons. A segmented drift chamber in a 1.5 T magnetic field is used to identify and measure charged particles. A fast on-line trigger on charged and neutral multiplicities and on the invariant mass of secondary particles is available. The performance of the detector is discussed. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA,SWITZERLAND. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. UNIV MAINZ,W-6500 MAINZ,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RI Meyer, Curtis/L-3488-2014; OI Meyer, Curtis/0000-0001-7599-3973; Burchell, Mark/0000-0002-2680-8943 NR 51 TC 270 Z9 270 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 SEP 15 PY 1992 VL 321 IS 1-2 BP 69 EP 108 DI 10.1016/0168-9002(92)90379-I PG 40 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000009 ER PT J AU ATIYA, MS CHIANG, IH FRANK, JS GARBER, E HAGGERTY, JS ITO, M KYCIA, TF LI, KK LITTENBERG, LS NG, C POLK, I ROSENKA, R SAMBAMURTI, AK STEVENS, AJ STRAND, RC ZEIN, C AKERIB, DS EDWARDS, H LOUIS, WC MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS AHMAD, S BLACKMORE, EW BRYMAN, DA CHEN, LJ CRESSWELL, JV FELAWKA, L KHAN, N KITCHING, P KONAKA, A KUNO, Y MACDONALD, JA NUMAO, T PADLEY, P POUTISSOU, JM POUTISSOU, R ROY, J SOLUK, R TURCOT, AS AF ATIYA, MS CHIANG, IH FRANK, JS GARBER, E HAGGERTY, JS ITO, M KYCIA, TF LI, KK LITTENBERG, LS NG, C POLK, I ROSENKA, R SAMBAMURTI, AK STEVENS, AJ STRAND, RC ZEIN, C AKERIB, DS EDWARDS, H LOUIS, WC MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS AHMAD, S BLACKMORE, EW BRYMAN, DA CHEN, LJ CRESSWELL, JV FELAWKA, L KHAN, N KITCHING, P KONAKA, A KUNO, Y MACDONALD, JA NUMAO, T PADLEY, P POUTISSOU, JM POUTISSOU, R ROY, J SOLUK, R TURCOT, AS TI A DETECTOR TO SEARCH FOR K+-]PI+V(V)OVER-BAR) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID RARE KAON DECAYS; LIGHT AB The detector built for experiment 787 to measure the decay K+ --> pi+ nunuBAR at Brookhaven National Laboratory is described. C1 PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. RP ATIYA, MS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Marlow, Daniel/C-9132-2014 NR 30 TC 39 Z9 39 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 SEP 15 PY 1992 VL 321 IS 1-2 BP 129 EP 151 DI 10.1016/0168-9002(92)90382-E PG 23 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000012 ER PT J AU ALSMILLER, RG LILLIE, RA AF ALSMILLER, RG LILLIE, RA TI DESIGN CALCULATIONS FOR THE ANS COLD NEUTRON SOURCE .2. HEATING RATES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Calculated results to aid in the design of a liquid deuterium cold source in the D2O reflector of a high-flux reactor are presented. The results presented include a comparison with experimental data, neutron leakage current as a function of wavelength, and heating rates in liquid deuterium and the other materials of the cold source. RP ALSMILLER, RG (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 15 PY 1992 VL 321 IS 1-2 BP 265 EP 270 DI 10.1016/0168-9002(92)90399-O PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000029 ER PT J AU MANE, SR AF MANE, SR TI SOLUTIONS OF LAPLACE EQUATION IN 2 DIMENSIONS WITH A CURVED LONGITUDINAL AXIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We derive a set of functions which satisfies Laplace's equation in two dimensions x and y, when the longitudinal or z axis has a constant but nonzero curvature. The functions generalize the Fourier harmonics of the standard two-dimensional multipole expansion. Both the electrostatic scalar potential and the magnetic vector potential, and the electric and magnetic fields, are treated. Recursion relations are also supplied, in a form suitable for use in a computer program, to evaluate the multipoles to arbitrary order. A comparison with other work in the field is also presented. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 15 PY 1992 VL 321 IS 1-2 BP 365 EP 375 DI 10.1016/0168-9002(92)90414-Y PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000044 ER PT J AU PARKER, WE GAVRON, A AF PARKER, WE GAVRON, A TI EXAMINATION OF POTENTIAL IMPROVEMENTS TO HIGH-ENERGY TRANSPORT CODES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID INTRANUCLEAR-CASCADE CALCULATION; GEV PROTONS; COLLISIONS AB We consider interactions between 0.2-2.6 GeV protons on Au as a benchmark. We examine whether the utilization of improved intra-nuclear cascade and evaporation models improve the agreement between the codes and experimental data. RP PARKER, WE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 15 PY 1992 VL 321 IS 1-2 BP 376 EP 380 DI 10.1016/0168-9002(92)90417-3 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JP590 UT WOS:A1992JP59000045 ER PT J AU CRANE, JK PERRY, MD HERMAN, S FALCONE, RW AF CRANE, JK PERRY, MD HERMAN, S FALCONE, RW TI HIGH-FIELD HARMONIC-GENERATION IN HELIUM SO OPTICS LETTERS LA English DT Article ID LASER AB We observe harmonics of 526-nm laser light up to the 45th order, 11.7 nm, in helium. We discuss the extension of the harmonic plateau with increasing laser intensity. The data suggest that the highest harmonic order produced depends on the highest intensity seen by the atom before photoionization. Harmonics are generated predominantly from neutrals. Harmonic generation from ions is weak owing to poor phase matching between the fundamental and harmonic fields at high electron densities. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP CRANE, JK (reprint author), LAWRENCE LIVERMORE NATL LAB,LASER PROGRAM,POB 808,LIVERMORE,CA 94550, USA. NR 11 TC 67 Z9 67 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1992 VL 17 IS 18 BP 1256 EP 1258 DI 10.1364/OL.17.001256 PG 3 WC Optics SC Optics GA JM316 UT WOS:A1992JM31600002 PM 19798149 ER PT J AU DANE, CB NEUMAN, WA HACKEL, LA AF DANE, CB NEUMAN, WA HACKEL, LA TI PULSE-SHAPE DEPENDENCE OF STIMULATED-BRILLOUIN-SCATTERING PHASE-CONJUGATION FIDELITY FOR HIGH INPUT ENERGIES SO OPTICS LETTERS LA English DT Article ID SYSTEMS AB The shot-to-shot phase fidelity of a stimulated-Brillouin-scattering phase conjugator operated many times above threshold has been found to be very sensitive to the slope of the leading edge of the input pulse. For a pulse with a rising edge that is short relative to the acoustic lifetime of the stimulated-Brillouin-scattering medium, strong random fluctuations in the fidelity of the wave-front reversal are observed. However, by tailoring the leading edge of the pulse relative to the acoustic response time of the medium, good phase reproduction has been demonstrated for input energies of 100 times above threshold. RP DANE, CB (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 13 TC 33 Z9 34 U1 1 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1992 VL 17 IS 18 BP 1271 EP 1273 DI 10.1364/OL.17.001271 PG 3 WC Optics SC Optics GA JM316 UT WOS:A1992JM31600007 PM 19798154 ER PT J AU HUANG, CP ASAKI, MT BACKUS, S MURNANE, MM KAPTEYN, HC NATHEL, H AF HUANG, CP ASAKI, MT BACKUS, S MURNANE, MM KAPTEYN, HC NATHEL, H TI 17-FS PULSES FROM A SELF-MODE-LOCKED TI-SAPPHIRE LASER SO OPTICS LETTERS LA English DT Article ID GENERATION AB We have generated sub-17-fs-duration pulses directly from a self-mode-locked Ti:sapphire laser. These pulses are near transform limited, with a wavelength centered at 817 nm, a pulse repetition rate of 80 MHz, and an average power of 500 nW. By minimizing the amount of material inside the laser cavity and choosing the correct glass for the intracavity prism pair, third-order dispersion in the laser can be significantly reduced compared with that in previous designs. Extracavity compensation for group-velocity dispersion in the output coupler and autocorrelator optics is necessary to measure this pulse width. To our knowledge this laser generates pulses substantially shorter than any other laser to date. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP HUANG, CP (reprint author), WASHINGTON STATE UNIV,DEPT PHYS,PULLMAN,WA 99164, USA. RI Backus, Sterling/C-2506-2008; Kapteyn, Henry/H-6559-2011 OI Kapteyn, Henry/0000-0001-8386-6317 NR 11 TC 92 Z9 101 U1 5 U2 24 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1992 VL 17 IS 18 BP 1289 EP 1291 DI 10.1364/OL.17.001289 PG 3 WC Optics SC Optics GA JM316 UT WOS:A1992JM31600013 PM 19798160 ER PT J AU WARD, TL LYONS, SW KODAS, TT BRYNESTAD, J KROEGER, DM HSU, H AF WARD, TL LYONS, SW KODAS, TT BRYNESTAD, J KROEGER, DM HSU, H TI CHARACTERISTICS OF BI-PB-SR-CA-CU-O POWDERS PRODUCED BY AEROSOL DECOMPOSITION AND THEIR RAPID CONVERSION TO THE HIGH-TC PHASE SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTOR; THIN-FILMS; SPRAY-PYROLYSIS; SYSTEM; CERAMICS; OXIDES; EVAPORATION; PARTICLES; LEAD AB Bi-Pb-Sr-Ca-Cu-O powders were produced by aerosol decomposition of nitrate solutions. The effects of reactor temperature and residence time on particle morphology and evaporative Pb loss from particles were demonstrated, and conditions necessary to control Pb loss established. Pb loss was roughly proportional to residence time, and minimal loss occurred with short residence times (3s) and T less-than-or-equal-to 800-degrees-C. Particles produced at 700-degrees-C typically contained significant porosity, while those produced at T great-than-or-equal-to 800-degrees-C were solid. Mixtures of the Bi2Sr2CuOy (2201) and Bi2Sr2CaCu2Oy (2212) phases were produced at 700-900-degrees-C in nitrogen and air. However, after heating in air for 16 h at 850-degrees-C, pellets of powder produced at 700-degrees-C with nominal composition Pb0.44Bi1.8Sr2Ca2.2Cu3Oy converted to approximately 79 vol.% of the Bi2Sr2Ca2Cu3Oy (2223) phase and displayed a T(c) (onset) of 110 K. Rapid conversion to 2223 was promoted by powder synthesis conditions, leading to controlled Pb loss and a homogeneous fine-grained dispersion of mixed-oxide precursor phases within particles. C1 UNIV NEW MEXICO,CTR MICROENGN CERAM,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 39 TC 31 Z9 31 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD SEP 15 PY 1992 VL 200 IS 1-2 BP 31 EP 42 DI 10.1016/0921-4534(92)90319-8 PG 12 WC Physics, Applied SC Physics GA JP087 UT WOS:A1992JP08700005 ER PT J AU WENK, HR PHILLIPS, DS AF WENK, HR PHILLIPS, DS TI HIGHLY TEXTURED BI-2223 AGGREGATES PRODUCED BY COLD PRESSING OF POWDERS SO PHYSICA C LA English DT Article ID CRITICAL CURRENT-DENSITY; CU-O SUPERCONDUCTORS; PREFERRED ORIENTATION; ANISOTROPY; YBA2CU3OX; WIRES; PHASE AB An improved methodology is shown to evaluate crystallographic textures in pressed pellets of Bi-2223 powders. The X-ray analysis documents that, after uniaxial compression to -50% strain, ten times as many plate-like crystallites have their c-axes parallel to the compression direction as perpendicular to it. This pattern of preferred orientation is in agreement with expectations from a model of homogeneous reorientation of rigid particles during compaction. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CERAM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545. RP WENK, HR (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. NR 30 TC 19 Z9 19 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD SEP 15 PY 1992 VL 200 IS 1-2 BP 105 EP 112 DI 10.1016/0921-4534(92)90326-8 PG 8 WC Physics, Applied SC Physics GA JP087 UT WOS:A1992JP08700012 ER PT J AU KIM, YH CHEONG, SW FISK, Z AF KIM, YH CHEONG, SW FISK, Z TI PHASE-SEPARATION OF CHARGE-CARRIERS IN LA2CUO4 SO PHYSICA C LA English DT Article ID TRANSIENT PHOTOINDUCED CONDUCTIVITY; SINGLE-CRYSTALS; METALLIC STATE AB We present experimental evidence for the instability of photogenerated charge carriers (photocarriers) against phase separation into metallic domains in the CuO2 planes. Our results of photoinduced infrared absorption measurements on La2CuO4 indicate that photocarriers are inhomogeneously distributed in the CuO2 planes, forming metallic domains which condense into the superconducting state at low temperatures with an onset at T approximately 40 K. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KIM, YH (reprint author), UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221, USA. NR 16 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD SEP 15 PY 1992 VL 200 IS 1-2 BP 201 EP 206 DI 10.1016/0921-4534(92)90338-D PG 6 WC Physics, Applied SC Physics GA JP087 UT WOS:A1992JP08700024 ER PT J AU THEILER, J EUBANK, S LONGTIN, A GALDRIKIAN, B FARMER, JD AF THEILER, J EUBANK, S LONGTIN, A GALDRIKIAN, B FARMER, JD TI TESTING FOR NONLINEARITY IN TIME-SERIES - THE METHOD OF SURROGATE DATA SO PHYSICA D LA English DT Article ID ESTIMATING ATTRACTOR DIMENSIONS; POWER-LAW SPECTRA; STRANGE ATTRACTORS; CLIMATIC ATTRACTORS; CHAOS; CONVERGENCE; EXPONENTS; SYSTEMS; NOISE; RATES AB We describe a statistical approach for identifying nonlinearity in time series. The method first specifies some linear process as a null hypothesis, then generates surrogate data sets which are consistent with this null hypothesis, and finally computes a discriminating statistic for the original and for each of the surrogate data sets. If the value computed for the original data is significantly different than the ensemble of values computed for the surrogate data, then the null hypothesis is rejected and nonlinearity is detected. We discuss various null hypotheses and discriminating statistics. The method is demonstrated for numerical data generated by known chaotic systems, and applied to a number of experimental time series which arise in the measurement of superfluids, brain waves, and sunspots; we evaluate the statistical significance of the evidence for nonlinear structure in each case, and illustrate aspects of the data which this approach identifies. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. SANTA FE INST,SANTA FE,NM 87501. PREDICT CO,SANTA FE,NM 87501. RP THEILER, J (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Longtin, Andre/D-2443-2009; Eubank, Stephen/D-7497-2011 OI Eubank, Stephen/0000-0002-7177-309X NR 73 TC 2158 Z9 2221 U1 7 U2 77 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP 15 PY 1992 VL 58 IS 1-4 BP 77 EP 94 DI 10.1016/0167-2789(92)90102-S PG 18 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA JV858 UT WOS:A1992JV85800006 ER PT J AU NOAKES, L MEES, A AF NOAKES, L MEES, A TI DYNAMIC SIGNATURES SO PHYSICA D LA English DT Article ID CHAOTIC TIME-SERIES; STRANGE ATTRACTORS AB We describe work in progress on using time series data output from dynamical systems to determine information about phase manifolds. Purely from estimates of the probability density of observations, it turns out to be possible in principle to determine the dimension and genus of the manifold. We also show experimental evidence that our methods may be useful for fractal attractors which have nearly integer dimension and are well-approximated by smooth objects such as smooth manifolds with boundary or branched manifolds. Our methods do not use embedding and do not require knowledge of dimensions or choice of time delays or projections. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR SCI,LOS ALAMOS,NM 87545. SANTA FE INST,SANTA FE,NM. RP NOAKES, L (reprint author), UNIV WESTERN AUSTRALIA,DEPT MATH,NEDLANDS,WA 6009,AUSTRALIA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP 15 PY 1992 VL 58 IS 1-4 BP 243 EP 250 DI 10.1016/0167-2789(92)90112-Z PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA JV858 UT WOS:A1992JV85800016 ER PT J AU SCHARF, R SUNDARAM, B AF SCHARF, R SUNDARAM, B TI PERIODIC-ORBITS IN QUANTUM STANDARD MAPS SO PHYSICAL REVIEW A LA English DT Article ID SYSTEMS; SCARS; LOCALIZATION; FIELDS; CHAOS AB The importance of periodic orbits, both elliptic and hyperbolic, in analyzing driven quantum systems is now well established. We present a detailed analysis of the quantum mechanics in the vicinity of these orbits for both a piecewise-linear and the original standard maps. We begin by constructing effective Hamiltonian operators valid locally near nondegenerate periodic orbits. Our general formula allows for the calculation of the quasienergy spectrum near elliptic orbits as well as of the strength of scarring on hyperbolic orbits. Preliminary results on the dependence of this measure of scarring on the instability of the classical orbit and on h are also presented. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. RP SCHARF, R (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Sundaram, Bala/A-6532-2010 OI Sundaram, Bala/0000-0002-1728-704X NR 26 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP 15 PY 1992 VL 46 IS 6 BP 3164 EP 3177 DI 10.1103/PhysRevA.46.3164 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500027 ER PT J AU KIVSHAR, YS PEYRARD, M AF KIVSHAR, YS PEYRARD, M TI MODULATIONAL INSTABILITIES IN DISCRETE LATTICES SO PHYSICAL REVIEW A LA English DT Article ID INTRINSIC LOCALIZED MODES; ANHARMONIC LATTICES; PULSES AB We study analytically and numerically modulational instabilities in discrete nonlinear chains, taking the discrete Klein-Gordon model as an example. We show that discreteness can drastically change the conditions for modulational instability; e.g., at small wave numbers a nonlinear carrier wave is unstable to all possible modulations of its amplitude if the wave amplitude exceeds a certain threshold value. Numerical simulations show the validity of the analytical approach for the initial stage of the time evolution, provided that the harmonics generated by the nonlinear terms are considered. The long-term evolution exhibits chaoticlike states. C1 FAC SCI DIJON,F-21000 DIJON,FRANCE. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP KIVSHAR, YS (reprint author), UNIV DUSSELDORF,INST THEORET PHYS 1,W-4000 DUSSELDORF 1,GERMANY. RI PEYRARD, Michel/C-8494-2014 NR 32 TC 297 Z9 302 U1 0 U2 11 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 SEP 15 PY 1992 VL 46 IS 6 BP 3198 EP 3205 DI 10.1103/PhysRevA.46.3198 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500030 ER PT J AU BERRYMAN, JG AF BERRYMAN, JG TI EXACT EFFECTIVE-STRESS RULES IN ROCK MECHANICS SO PHYSICAL REVIEW A LA English DT Article ID POROUS-MEDIA; PERMEABILITY; FLUID; MODEL AB The standard paradigm for analysis of rock deformation arises from postulating the existence of "an equivalent homogeneous porous rock." However, data on the pore-pressure dependence of fluid permeability for some rocks cannot be explained using any equivalent homogeneous porous medium. In contrast, a positive result shows that deformation measurements on both high-porosity sandstones and low-porosity granites can be explained adequately in terms of an equivalent two-constituent model of porous rocks, for which exact results have recently been discovered. RP LAWRENCE LIVERMORE NATL LAB, POB 808 L-202, LIVERMORE, CA 94551 USA. RI Berryman, James/A-9712-2008 NR 16 TC 10 Z9 12 U1 2 U2 8 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 SEP 15 PY 1992 VL 46 IS 6 BP 3307 EP 3311 DI 10.1103/PhysRevA.46.3307 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500041 ER PT J AU GABELLA, WE RUTH, RD WARNOCK, RL AF GABELLA, WE RUTH, RD WARNOCK, RL TI ITERATIVE DETERMINATION OF INVARIANT TORI FOR A TIME-PERIODIC HAMILTONIAN WITH 2 DEGREES OF FREEDOM SO PHYSICAL REVIEW A LA English DT Article ID MECHANICS; MOTION AB We describe a nonperturbative numerical technique for solving the Hamilton-Jacobi equation of a nonlinear Hamiltonian system. We find the time-periodic solutions that yield accurate approximations to invariant tori. The method is suited to the case in which the perturbation to the underlying integrable system has a periodic and not necessarily smooth dependence on the time. This case is important in accelerator theory, where the perturbation is a periodic step function in time. The Hamilton-Jacobi equation is approximated by its finite-dimensional Fourier projection with respect to angle variables, then solved by Newton's method. To avoid Fourier analysis in time, which is not appropriate in the presence of step functions, we enforce time periodicity of solutions by a shooting algorithm. The method is tested in soluble models, and finally applied to a nonintegrable example, the transverse oscillations of a particle beam in a storage ring, in two degrees of freedom. In view of the time dependence of the Hamiltonian, this is a case with "2 1/2 degrees of freedom," in which phenomena like Arnol'd diffusion can occur. C1 UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. NR 46 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP 15 PY 1992 VL 46 IS 6 BP 3493 EP 3512 DI 10.1103/PhysRevA.46.3493 PG 20 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500060 ER PT J AU WEN, HC DUONGVAN, M AF WEN, HC DUONGVAN, M TI BRANCH STRUCTURES AT THE STEPS OF THE DEVILS STAIRCASE OF THE SINE CIRCLE MAP SO PHYSICAL REVIEW A LA English DT Note AB We have discovered substructures consisting of branches at each step of the devil's staircase of the sine circle map. These substructures are found to follow the hierarchy of the Farey tree. We develop a formalism to relate the rational winding number W=p/q to the number of branches in these substructures. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. RP WEN, HC (reprint author), STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP 15 PY 1992 VL 46 IS 6 BP 3535 EP 3537 DI 10.1103/PhysRevA.46.3535 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500066 ER PT J AU SCHARF, R BISHOP, AR AF SCHARF, R BISHOP, AR TI SOLITON CHAOS IN THE NONLINEAR SCHRODINGER-EQUATION WITH SPATIALLY PERIODIC PERTURBATIONS SO PHYSICAL REVIEW A LA English DT Article ID SYSTEMS; MEDIA AB We perturb the one-dimensional nonlinear Schrodinger equation with a time-independent spatially periodic potential with a period large compared to the spatial width of solitons present in the system. A collective-coordinate approximation maps the system to a nonintegrable many-particle dynamics with an effective Hamiltonian, which we derive under the assumption that we can neglect three-soliton collisions as well as two-soliton collisions with vanishing relative velocity. We give an estimate for the power radiated by a single soliton in the presence of the perturbation and show that radiative effects can be neglected for perturbations with sufficiently small amplitude and large spatial period. We show that the nonintegrability of this perturbed nonlinear Schrodinger equation manifests itself already in the two-soliton sector. We use the effective many-particle Hamiltonian to investigate soliton depinning. The effective Hamiltonian results are compared with numerical simulations of the full perturbed equation. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. NR 18 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP 15 PY 1992 VL 46 IS 6 BP R2973 EP R2976 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500001 ER PT J AU CHACHAM, H ZHU, XJ LOUIE, SG AF CHACHAM, H ZHU, XJ LOUIE, SG TI PRESSURE-INDUCED INSULATOR-METAL TRANSITIONS IN SOLID XENON AND HYDROGEN - A 1ST-PRINCIPLES QUASI-PARTICLE STUDY SO PHYSICAL REVIEW B LA English DT Article ID NORM-CONSERVING PSEUDOPOTENTIALS; OPTICAL-ABSORPTION EDGE; MEGABAR PRESSURES; PHASE-TRANSITION; GROUND-STATE; MOLECULAR-HYDROGEN; DENSE HYDROGEN; BAND-STRUCTURE; A PHASE; X-RAY AB We report a quasiparticle study of the pressure-induced isostructural insulator-metal transition in solids by the mechanism of band-gap closure. Two examples are investigated: solid Xe and molecular solid hydrogen. The band gaps are calculated with a first-principles quasiparticle approach, in which the electron self-energy operator is expanded to first order in the screened Coulomb interaction, viz., the GW approximation. For the case of solid xenon, the crystal structure has been experimentally established to be hexagonal-close-packed (hcp) in the vicinity of the observed metallization pressure of 132(+/-5) GPa. Our calculation for solid xenon yields a metallization pressure of 128 GPa, in good agreement with experiment. The theoretical results further quantitatively explain all the salient features observed in the experimental optical spectra at metallization. For molecular solid hydrogen the structure has yet to be determined definitively. Our calculations are carried out for structures in which hydrogen molecules assume an hcp arrangement. The quasiparticle results are compared with those from Hartree-Fock (HF) and local-density approximation (LDA) calculations. In addition to the well-known HF overestimate and the LDA underestimate of the band gap, we find that both HF and LDA predict a linear behavior in the band gap versus density, whereas the quasiparticle results do not show such a linearity. This difference results from a significant increase in the dielectric screening with density, which gives rise to a strong and nontrivial dependence of the self-energy correction to the LDA band gap on density. We have also studied the effects of orientational disorder of the H-2 Molecules within a virtual-crystal model. We find that at a given density, the minimum band gap increases monotonically and nonlinearly with orientational disorder. A simple tight-binding picture provides a convenient way to understand the variation of the hydrogen band gap both with pressure and with disorder. Our calculations predict a metallization pressure of 151 GPa for the hcp phase if the molecules are perfectly aligned along the c axis, and 300 GPa if there is no orientational order. At present, a definitive conclusion is difficult to draw as regards the metallization of molecular solid hydrogen. More details of the crystal structure, especially those concerning the orientational ordering of molecular H-2 at megabar pressures, are needed. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 65 TC 44 Z9 44 U1 0 U2 2 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 SEP 15 PY 1992 VL 46 IS 11 BP 6688 EP 6699 DI 10.1103/PhysRevB.46.6688 PG 12 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600003 ER PT J AU MIYANO, KE KENDELEWICZ, T WOICIK, JC COWAN, PL BOULDIN, CE KARLIN, BA PIANETTA, P SPICER, WE AF MIYANO, KE KENDELEWICZ, T WOICIK, JC COWAN, PL BOULDIN, CE KARLIN, BA PIANETTA, P SPICER, WE TI STRUCTURAL CHARACTERIZATION OF THE (1 MONOLAYER SB)/GAP(110) INTERFACE USING X-RAY STANDING WAVES SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-ELECTRON-DIFFRACTION; III-V-SEMICONDUCTORS; SB OVERLAYERS; 110 SURFACES; DYNAMICAL ANALYSIS; PHOTOEMISSION; SB/GAAS(110); SPECTROSCOPY; INTENSITIES; GAAS(110) AB The x-ray-standing-wave technique has been applied to the (1 monolayer Sb)/GaP (110) interface. Using the back-reflection geometry from (200) and (220) planes, the buckling of the Sb chains was determined to be 0.04 +/- 0.10 angstrom and the perpendicular displacement of these chains from the extrapolated bulk (220) plane was determined to be 2.31 +/- 0.10 angstrom. These measurements favor a structure such that Sb adatoms occupy sites analogous to those of the next extrapolated substrate layer. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP MIYANO, KE (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. NR 29 TC 21 Z9 21 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 SEP 15 PY 1992 VL 46 IS 11 BP 6869 EP 6874 DI 10.1103/PhysRevB.46.6869 PG 6 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600023 ER PT J AU LI, T LOZYKOWSKI, HJ RENO, JL AF LI, T LOZYKOWSKI, HJ RENO, JL TI OPTICAL-PROPERTIES OF CDTE/CD1-XZNXTE STRAINED-LAYER SINGLE QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID WANNIER EXCITONS; ENERGY-LEVELS; PHOTOLUMINESCENCE; SEMICONDUCTORS; RECOMBINATION; SPECTROSCOPY AB The electronic states in a series of molecular-beam-epitaxy-grown CdTe/Cd0.79Zn0.21Te strained-layer single quantum wells have been studied both theoretically and experimentally. Calculations based on model solid theory and deformation-potential theory have shown that, at Zn concentration of 0.21 in the barriers, the band lineup is type I for heavy holes and type II for light holes. The confined states were calculated using the three-band envelope function model. Photoluminescence measurement at temperatures between 9 and 100 K indicates that the broadening mechanism is dominated by the polar optical phonon (longitudinal optical) interactions. The circularly polarized excitation spectra have shown predominant heavy-hole feature confirming that the band lineup is type I for heavy holes and type II for light holes. With well width between 25 and 75 angstrom, our study has shown that exciton binding energy decreases with decreasing well width. C1 WRIGHT RES & DEV CTR, ELECTR TECHNOL LAB, DAYTON, OH 45433 USA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP OHIO UNIV, DEPT ELECT & COMP ENGN, ATHENS, OH 45701 USA. NR 31 TC 39 Z9 43 U1 1 U2 6 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 SEP 15 PY 1992 VL 46 IS 11 BP 6961 EP 6968 DI 10.1103/PhysRevB.46.6961 PG 8 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600035 ER PT J AU HORSKY, TN BRANDES, GR CANTER, KF DUKE, CB PATON, A LESSOR, DL KAHN, A HORNG, SF STEVENS, K STILES, K MILLS, AP AF HORSKY, TN BRANDES, GR CANTER, KF DUKE, CB PATON, A LESSOR, DL KAHN, A HORNG, SF STEVENS, K STILES, K MILLS, AP TI ANALYSIS OF THE ATOMIC GEOMETRIES OF THE (1010) AND (1120) SURFACES OF CDSE BY LOW-ENERGY-ELECTRON DIFFRACTION AND LOW-ENERGY-POSITRON DIFFRACTION SO PHYSICAL REVIEW B LA English DT Article ID MEAN FREE PATHS; CLEAVAGE FACES; COMPOUND SEMICONDUCTORS; BRIGHTNESS ENHANCEMENT; DYNAMICAL ANALYSIS; INTENSITIES; CU(100); RECONSTRUCTIONS; DEPENDENCE; SCATTERING AB The relaxed atomic geometries of the low-index cleavage surfaces of wurtzite-structure CdSe are determined via comparison of dynamical scattering calculations with measured low-energy-electron-diffraction (LEED) and low-energy-positron-diffraction (LEPD) intensities. Both surfaces are found to be relaxed in accordance with recently proposed geometries deduced from total-energy-minimization calculations. Since this analysis represents the use of LEPD for quantitative surface-structure determination, we discuss the experimental technique, the differences observed between LEPD and LEED, and the complementary nature of the two spectroscopies. C1 BRANDEIS UNIV, DEPT PHYS, WALTHAM, MA 02251 USA. XEROX WEBSTER RES CTR, WEBSTER, NY 14580 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. PRINCETON UNIV, DEPT ELECT ENGN, PRINCETON, NJ 08544 USA. AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. NR 65 TC 39 Z9 39 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1992 VL 46 IS 11 BP 7011 EP 7026 DI 10.1103/PhysRevB.46.7011 PG 16 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600041 ER PT J AU WANG, L DAVIDS, PS SAXENA, A BISHOP, AR AF WANG, L DAVIDS, PS SAXENA, A BISHOP, AR TI QUASI-PARTICLE ENERGY-SPECTRA AND MAGNETIC RESPONSE OF CERTAIN CURVED GRAPHITIC GEOMETRIES SO PHYSICAL REVIEW B LA English DT Article ID ICOSAHEDRAL C-60; C60; SUSCEPTIBILITY; BUCKMINSTERFULLERENE; CARBON AB The quasiparticle energy spectra associated with some members of fullerene (curved graphitic geometries, e.g., C50, C60, C70, and helical graphitic microtubules) are obtained analytically within the Hartree-Fock mean-field approximation. The magnetization and magnetic susceptibility are calculated in the presence of a strong external magnetic field at zero temperature. Interesting theoretical predictions such as the single quasiparticle excitation energies for C50, C50+; C60, C60+; C70 and C70+ as well as the presence of an extra peak in de Haas-van Alphen oscillations for a helical graphitic microtubule are discussed in terms of accessible experimental measurements. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP WANG, L (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Davids, Paul/D-1550-2010 NR 20 TC 31 Z9 32 U1 2 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1992 VL 46 IS 11 BP 7175 EP 7178 DI 10.1103/PhysRevB.46.7175 PG 4 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600059 ER PT J AU SELA, I SAMOSKA, LA BOLOGNESI, CR GOSSARD, AC KROEMER, H AF SELA, I SAMOSKA, LA BOLOGNESI, CR GOSSARD, AC KROEMER, H TI RAMAN-SCATTERING FROM INTERFACE MODES IN GA1-XINXSB/INAS SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Note ID INAS/GASB SUPERLATTICES; INFRARED DETECTORS; PHONONS AB In this study we use Raman scattering from Ga1-xInxSb/InAs grown by molecular-beam epitaxy superlattices to identify and study interface modes. Those modes are localized around the interfaces of the superlattices. We identify three types of longitudinal interface modes; two GaAs-like and one InSb-like. The frequency and the Raman activity of those modes are in good agreement with theoretical calculations. In addition, it is shown that the interface modes can be used to identify the interface composition (InSb or GaAs) for a variety of samples grown under controlled shutter sequences. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT ENGN MAT,SANTA BARBARA,CA 93106. NR 13 TC 21 Z9 21 U1 1 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 SEP 15 PY 1992 VL 46 IS 11 BP 7200 EP 7203 DI 10.1103/PhysRevB.46.7200 PG 4 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600066 ER PT J AU JONES, ED SCHNEIDER, RP LEE, SM BAJAJ, KK AF JONES, ED SCHNEIDER, RP LEE, SM BAJAJ, KK TI MAGNETIC-FIELD-DEPENDENT EXCITONIC PHOTOLUMINESCENCE LINEWIDTH IN IN0.48GA0.52P SEMICONDUCTOR ALLOYS SO PHYSICAL REVIEW B LA English DT Note AB We report the observation of a magnetic-field-dependent excitonic photoluminescence linewidth in In0.48Ga0.52P semiconductor alloys (lattice matched to GaAs). The measurements were made at 1.4 K and the magnetic field ranged between 0 and 13.6 T. The photoluminescence peak energies ranged between 1.976 and 1.995 eV while the full width half maximum linewidths varied from 4.3 to 6.0 meV. The linewidth variation is compared with several calculations which take into account the potential fluctuations caused by the disorder of the alloy components. C1 EMORY UNIV,DEPT PHYS,ATLANTA,GA 30322. RP JONES, ED (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 19 Z9 19 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 SEP 15 PY 1992 VL 46 IS 11 BP 7225 EP 7228 DI 10.1103/PhysRevB.46.7225 PG 4 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600073 ER PT J AU MOWBRAY, DJ HOGG, RA SKOLNICK, MS DELONG, MC KURTZ, SR OLSON, JM AF MOWBRAY, DJ HOGG, RA SKOLNICK, MS DELONG, MC KURTZ, SR OLSON, JM TI VALENCE-BAND SPLITTING IN ORDERED GA0.5IN0.5P MEASURED BY POLARIZED PHOTOLUMINESCENCE EXCITATION SPECTROSCOPY SO PHYSICAL REVIEW B LA English DT Note ID ALLOYS; GAP; GA0.52IN0.48P AB The spontaneous long-range-order-induced splitting of the valence band of Ga0.5In0.5P is studied by polarized near-gap-excited photoluminescence and photoluminescence excitation. The results allow a direct determination of the size of the valence-band splitting and the relative ordering of the resultant states. Values obtained for the splitting are compared with recent calculations. C1 UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP MOWBRAY, DJ (reprint author), UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. RI Hogg, Richard/D-4925-2009; Skolnick, Maurice/G-7250-2016 OI Hogg, Richard/0000-0002-0781-6809; Skolnick, Maurice/0000-0002-3972-8344 NR 15 TC 34 Z9 36 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 SEP 15 PY 1992 VL 46 IS 11 BP 7232 EP 7235 DI 10.1103/PhysRevB.46.7232 PG 4 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600075 ER PT J AU KENDELEWICZ, T WOICIK, JC MIYANO, KE HERRERAGOMEZ, A COWAN, PL KARLIN, BA BOULDIN, CE PIANETTA, P SPICER, WE AF KENDELEWICZ, T WOICIK, JC MIYANO, KE HERRERAGOMEZ, A COWAN, PL KARLIN, BA BOULDIN, CE PIANETTA, P SPICER, WE TI X-RAY STANDING-WAVE STUDY OF MONOLAYERS OF SB ON GAAS(110) SO PHYSICAL REVIEW B LA English DT Note ID SYNCHROTRON RADIATION BEAMLINE; SURFACE ELECTRONIC-STRUCTURE; HIGH-ENERGY-RESOLUTION; III-V-SEMICONDUCTORS; REGISTRATION PROBLEM; 110 SURFACES; OVERLAYERS; ANTIMONY; SPECTROSCOPY; INTERFACE AB The x-ray standing-wave technique has been used to determine the geometrical structure of Sb on GaAs(110). Using the back reflection diffraction geometry from (220) and (400) planes, we find the average vertical distance of Sb atoms from the GaAs surface to be 2.27 +/-0.05 angstrom in agreement with theoretical calculations for the epitaxial continued layer structure. Other models of buckled zigzag chains are found inconsistent with our results. Additionally, our data indicate less than 10% disorder in the Sb overlayer. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP KENDELEWICZ, T (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. NR 26 TC 36 Z9 36 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 SEP 15 PY 1992 VL 46 IS 11 BP 7276 EP 7279 DI 10.1103/PhysRevB.46.7276 PG 4 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600086 ER PT J AU ZHANG, BL XU, CH WANG, CZ CHAN, CT HO, KM AF ZHANG, BL XU, CH WANG, CZ CHAN, CT HO, KM TI SYSTEMATIC STUDY OF STRUCTURES AND STABILITIES OF FULLERENES SO PHYSICAL REVIEW B LA English DT Note ID CARBON CLUSTERS; BUCKMINSTERFULLERENE; C-60; C-76; C-84; C76 AB We describe a scheme to generate the ground-state network for carbon clusters. Combining this scheme with an accurate tight-binding potential for carbon, we have systematically studied the ground-state structures of fullerenes from C20 to C94. Clusters of sizes 60, 70, and 84 are found to be energetically more stable than their neighbors. The occurrence of the more abundant fullerene sizes is related to the fragmentation stability and chemical reactivity of the clusters obtained from our calculations. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZHANG, BL (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 22 TC 76 Z9 77 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 SEP 15 PY 1992 VL 46 IS 11 BP 7333 EP 7336 DI 10.1103/PhysRevB.46.7333 PG 4 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600101 ER PT J AU ZHANG, XG BUTLER, WH AF ZHANG, XG BUTLER, WH TI MULTIPLE-SCATTERING THEORY WITH A TRUNCATED BASIS SET SO PHYSICAL REVIEW B LA English DT Article ID ALLOYS AB Multiple-scattering theory (MST) is an extremely efficient technique for calculating the electronic structure of an assembly of atoms. The wave function in MST is expanded in terms of spherical waves centered on each atom and indexed by their orbital and azimuthal quantum numbers, l and m. The secular equation which determines the characteristic energies can be truncated at a value of the orbital angular momentum l(max), for which the higher angular momentum phase shifts, delta(l) (l > l(max)), are sufficiently small. Generally, the wave-function coefficients whir-h are calculated from the secular equation are also truncated at l(max). Here we point out that this truncation of the wave function is not necessary and is in fact inconsistent with the truncation of the secular equation. A consistent procedure is described in which the states with higher orbital angular momenta are retained but with their phase shifts set to zero. We show that this treatment gives smooth, continuous, and correctly normalized wave functions and that the total charge density calculated from the corresponding Green function agrees with the Lloyd formula result. We also show that this augmented wave function can be written as a linear combination of Andersen's muffin-tin orbitals in the case of muffin-tin potentials, and can be used to generalize the muffin-tin orbital idea to full-cell potentials. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP ZHANG, XG (reprint author), UNIV KENTUCKY,CTR COMPUTAT SCI,LEXINGTON,KY 40506, USA. NR 19 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 SEP 15 PY 1992 VL 46 IS 12 BP 7433 EP 7447 DI 10.1103/PhysRevB.46.7433 PG 15 WC Physics, Condensed Matter SC Physics GA JQ378 UT WOS:A1992JQ37800012 ER PT J AU KOEL, BE SELLIDJ, A PAFFETT, MT AF KOEL, BE SELLIDJ, A PAFFETT, MT TI ULTRATHIN FILMS OF PD ON AU(111) - EVIDENCE FOR SURFACE ALLOY FORMATION SO PHYSICAL REVIEW B LA English DT Article ID ION-SCATTERING SPECTROSCOPY; ELECTRONIC-STRUCTURE; CO CHEMISORPTION; THIN-FILMS; PHOTOEMISSION; OVERLAYERS; ADSORPTION; NB(110); TA(110); AU AB Pd ultrathin films on Au(111) have been prepared by vapor deposition and studied over the substrate temperature range 150-650 K using Auger electron spectroscopy (AES), low-energy ion-scattering spectroscopy (LEISS), x-ray photoelectron spectroscopy (XPS), and low-energy electron diffraction (LEED). With regard to assessing the growth mode of Pd adlayers on Au(111), AES uptake plots (AES signal intensity versus deposition time) are of limited utility. LEISS data are critical for establishing the surface composition of the deposited film and the existence of alloying. The growth mode of vapor-deposited Pd films on Au(111) at 150 K is described well by an epitaxial layer-by-layer mechanism for the first few layers. However, for Pd deposition at substrate temperatures of 300 K and above, LEISS data taken using 1 keV Ne+ ions indicate surface alloy formation, with the extent of Au interdiffusion increasing with temperature. Other experiments involving annealing monolayer Pd films show interdiffusion (alloying) at temperatures as low as 240 K. XPS data indicate very little (<0.2 eV) or no shifts in the Pd(3d), Au(4f), or Pd x-ray-excited Auger (M5VV) regions as a function of Pd coverage or substrate temperature. We discuss the surface stoichiometry in relation to prior published work on this system, the relevance of this system for studies of Pd monolayer and thin film properties, and our results pertaining to the surface chemistry of small molecule adsorbates on Pd films deposited on Au(111). C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KOEL, BE (reprint author), UNIV SO CALIF,DEPT CHEM,LOS ANGELES,CA 90089, USA. RI Koel, Bruce/H-3857-2013 OI Koel, Bruce/0000-0002-0032-4991 NR 39 TC 106 Z9 107 U1 3 U2 20 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 SEP 15 PY 1992 VL 46 IS 12 BP 7846 EP 7856 DI 10.1103/PhysRevB.46.7846 PG 11 WC Physics, Condensed Matter SC Physics GA JQ378 UT WOS:A1992JQ37800058 ER PT J AU OVERBURY, SH KU, YS AF OVERBURY, SH KU, YS TI FORMATION OF STABLE, 2-DIMENSIONAL ALLOY-SURFACE PHASES - SN ON CU(111), NI(111), AND PT(111) SO PHYSICAL REVIEW B LA English DT Article ID ALKALI ION-SCATTERING; OVERLAYERS; CU AB Results are summarized of ion-scattering analysis of the surface structure obtained following deposition and annealing of ultrathin layers of Sn on Cu(111), Ni(111), and Pt(111). It is found that on each substrate, annealing to about 0.4 of the substrate melting temperature gives rise to a stable structure characterized by a p(square-root 3 X square-root 3)-R 30-degrees low-energy electron diffraction pattern and 1/3 monolayer coverage. The surfaces are isostructural and correspond to rippled surface alloy which is a single layer thick. The measured rippling, in which Sn atoms protrude outward from neighboring substrate atoms, is found to be linearly related to the substrate lattice constant suggesting that rippling provides lateral strain relief within the layer. Issues of the depth distribution, the thermal stability, the preferential formation of the p(square-root 3 X square-root 3)-R 30-degrees ordering, and the measured rippling are discussed in light of the ion-scattering results and theoretical studies of surface alloys. RP OVERBURY, SH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 17 TC 76 Z9 76 U1 1 U2 9 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 SEP 15 PY 1992 VL 46 IS 12 BP 7868 EP 7872 DI 10.1103/PhysRevB.46.7868 PG 5 WC Physics, Condensed Matter SC Physics GA JQ378 UT WOS:A1992JQ37800061 ER PT J AU LYO, SK FRITZ, IJ AF LYO, SK FRITZ, IJ TI ALLOY-SCATTERING AND STRAIN-FLUCTUATION-SCATTERING CONTRIBUTIONS TO THE LOW-TEMPERATURE ELECTRON-MOBILITY IN TERNARY QUANTUM-WELLS AND HETEROSTRUCTURES SO PHYSICAL REVIEW B LA English DT Note AB We present theory and data for the low-temperature electron mobility in ternary quantum wells (QW's). In our model the electrons are scattered from spatially fluctuating strain-induced potentials and alloy potentials arising from alloy disorder both in lattice-matched and strained QW's. We find that the mobility does not depend sensitively on the amount of the average strain in the InxGa1-xAs quantum well but on the strain fluctuation. Lower mobilities observed in strained quantum wells are explained in terms of possible clustering effects which may be more severe in strained systems: The theoretical results agree with our data from strained In0.2Ga0.8As/GaAs QW's for a clustered In-atom distribution. On the other hand, the recent data from lattice-matched In0.53Ga0.47As/Ino.52Al0.48As heterostructures are reasonably explained for a microscopically random In-atom distribution without using the clustering assumption. RP LYO, SK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1992 VL 46 IS 12 BP 7931 EP 7934 DI 10.1103/PhysRevB.46.7931 PG 4 WC Physics, Condensed Matter SC Physics GA JQ378 UT WOS:A1992JQ37800073 ER PT J AU HUBERMAN, ML GRIMSDITCH, M AF HUBERMAN, ML GRIMSDITCH, M TI EFFECT OF THE ELECTRONIC KINETIC-ENERGY ON THE ELASTIC STRAIN IN METALLIC MULTILAYERS SO PHYSICAL REVIEW B LA English DT Note ID SUPERLATTICES AB A recent theory of induced strain in metallic multilayers, caused by electron transfer effects, is revised by taking into account the electronic kinetic energy. When this is done, it is found that the predicted sign of the strain is opposite to what was found previously. For a multilayer having abrupt composition changes, the predicted magnitude of the strain is greater by a factor of 9/5 than what was found previously, whereas for a multilayer having smooth composition changes, it is the same as what was found previously. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 8 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1992 VL 46 IS 12 BP 7949 EP 7952 DI 10.1103/PhysRevB.46.7949 PG 4 WC Physics, Condensed Matter SC Physics GA JQ378 UT WOS:A1992JQ37800079 ER PT J AU TURNER, MS WEINBERG, EJ WIDROW, LM AF TURNER, MS WEINBERG, EJ WIDROW, LM TI BUBBLE NUCLEATION IN 1ST-ORDER INFLATION AND OTHER COSMOLOGICAL PHASE-TRANSITIONS SO PHYSICAL REVIEW D LA English DT Article ID EXTENDED INFLATION; FALSE VACUUM; EARLY UNIVERSE; DARK MATTER; PERTURBATIONS; SPECTRUM; FLUCTUATIONS; HORIZON; ORIGIN; DECAY AB We address in some detail the kinematics of bubble nucleation and percolation in first-order cosmological phase transitions, with the primary focus on first-order inflation. We study how a first-order phase transition completes, describe measures of its progress, and compute the distribution of bubble sizes. For example, we find that the typical bubble size in a successful transition is of order 1% to 100% of the Hubble radius, and depends very weakly on the energy scale of the transition. We derive very general conditions that must be satisfied by GAMMA/H-4 to complete the phase transition (GAMMA=bubble nucleation rate per unit volume; H= expansion rate; physically, GAMMA/H-4 corresponds to the volume fraction of space occupied by bubbles nucleated over a Hubble time). In particular, GAMMA/H-4 must exceed 9/4-pi to successfully end inflation. To avoid the deleterious effects of bubbles nucleated early during inflation on primordial nucleosynthesis and on the isotropy and spectrum of the cosmic microwave background radiation, during most of inflation GAMMA/H-4 must be less than order 10(-4)-10(-3). Our constraints imply that in a successful model of first-order inflation the phase transition must complete over a period of at most a few Hubble times and all but preclude individual bubbles from providing an interesting source of density perturbation. We note, though, that it is just possible for Poisson fluctuations in the number of moderately large-size bubbles to lead to interesting isocurvature perturbations, whose spectrum is not scale invariant. Finally, we analyze in detail several recently proposed models of first-order inflation. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS & ASTRON,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTROPHYS,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,THEORY GRP,BATAVIA,IL 60510. COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027. INST ADV STUDY,SCH OPTOMETRY,PRINCETON,NJ 08540. UNIV TORONTO,CANADIAN INST THEORET ASTROPHYS,TORONTO M5S 1A1,ONTARIO,CANADA. RP TURNER, MS (reprint author), FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 61 TC 81 Z9 81 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 SEP 15 PY 1992 VL 46 IS 6 BP 2384 EP 2403 DI 10.1103/PhysRevD.46.2384 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JN598 UT WOS:A1992JN59800016 ER PT J AU HABIB, S AF HABIB, S TI STOCHASTIC INFLATION - QUANTUM PHASE-SPACE APPROACH SO PHYSICAL REVIEW D LA English DT Article ID ROBERTSON-WALKER UNIVERSES; SCALAR-FIELD; PROBABILITY-DISTRIBUTIONS; EXPANDING UNIVERSES; FLUCTUATIONS; PERTURBATIONS; DISSIPATION; DECOHERENCE; DYNAMICS; SCENARIO AB In this paper a quantum-mechanical phase-space picture is constructed for coarse-grained free quantum fields in an inflationary universe. The appropriate stochastic quantum Liouville equation is derived. Explicit solutions for the phase-space quantum distribution function are found for the cases of power-law and exponential expansions. The expectation values of dynamical variables with respect to these solutions are compared to the corresponding cutoff regularized field-theoretic results (we do not restrict ourselves only to [PHI-2]). Fair agreement is found provided the coarse-graining scale is kept within certain limits. By focusing on the full phase-space distribution function rather than a reduced distribution it is shown that the thermodynamic interpretation of the stochastic formalism faces several difficulties (e.g., there is no fluctuation-dissipation theorem). The coarse graining does not guarantee an automatic classical limit as quantum correlations turn out to be crucial in order to get results consistent with standard quantum field theory. Therefore, the method does not by itself constitute an explanation of the quantum to classical transition in the early Universe. In particular, we argue that the stochastic equations do not lead to decoherence. C1 UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. RP HABIB, S (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-6,LOS ALAMOS,NM 87545, USA. NR 45 TC 63 Z9 64 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 SEP 15 PY 1992 VL 46 IS 6 BP 2408 EP 2427 DI 10.1103/PhysRevD.46.2408 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JN598 UT WOS:A1992JN59800018 ER PT J AU BURDEN, CJ PRASCHIFKA, J ROBERTS, CD AF BURDEN, CJ PRASCHIFKA, J ROBERTS, CD TI PHOTON POLARIZATION TENSOR AND GAUGE DEPENDENCE IN 3-DIMENSIONAL QUANTUM ELECTRODYNAMICS SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL-SYMMETRY-BREAKING; GLUON PROPAGATOR; VERTEX FUNCTION; LATTICE; GAUGE; HIERARCHIES; FLAVORS; MASSES AB We calculate the three-dimensional QED (QED3) photon polarization tensor using dressed fermion propagators and a fermion-photon vertex that satisfies the Ward-Takahashi identity. Irrespective of the structural details of the transverse part of the fermion-photon vertex the photon remains massless; i.e., there is no photon mass generation in the manner of the Schwinger mechanism. Our calculation suggests that QED3 is confining when the polarization tensor is calculated using a dressed fermion propagator and fermion-photon ver-tex. The gauge parameter dependence of the fermion propagator, fermion-photon vertex, and photon polarization tensor is discussed in connection with the Landau-Khalatnikov gauge transformation laws. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP BURDEN, CJ (reprint author), AUSTRALIAN NATL UNIV,RES SCH PHYS SCI & ENGN,DEPT THEORET PHYS,CANBERRA,ACT 2601,AUSTRALIA. RI Burden, Conrad/D-5556-2016; OI Burden, Conrad/0000-0003-0015-319X; Roberts, Craig/0000-0002-2937-1361 NR 38 TC 85 Z9 87 U1 0 U2 2 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 SEP 15 PY 1992 VL 46 IS 6 BP 2695 EP 2702 DI 10.1103/PhysRevD.46.2695 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JN598 UT WOS:A1992JN59800047 ER PT J AU KRIVE, IV NAFTULIN, SA AF KRIVE, IV NAFTULIN, SA TI DYNAMIC SYMMETRY-BREAKING AND PHASE-TRANSITIONS IN A 3-DIMENSIONAL GROSS-NEVEU MODEL IN A STRONG MAGNETIC-FIELD SO PHYSICAL REVIEW D LA English DT Note AB The three-dimensional Gross-Neveu model in a strong magnetic field and at finite density is considered. It is shown that the phase structure of the model depends crucially on the filling of the threshold levels. In particular, with "asymmetric filling" of the threshold levels, a magnetic field induces a transition to a phase with broken chiral symmetry. C1 UKRAINIAN ACAD SCI,INST LOW TEMP PHYS & ENGN,KHARKOV 310164,UKRAINE,USSR. UKRAINIAN ACAD SCI,INST SINGLE CRYSTALS,KHARKOV 310141,UKRAINE,USSR. RP KRIVE, IV (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 17 TC 49 Z9 50 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 SEP 15 PY 1992 VL 46 IS 6 BP 2737 EP 2740 DI 10.1103/PhysRevD.46.2737 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JN598 UT WOS:A1992JN59800056 ER PT J AU HUGHES, RJ AF HUGHES, RJ TI NEW TEST OF THE EQUIVALENCE PRINCIPLE FOR THE ANTIPROTON SO PHYSICAL REVIEW D LA English DT Note ID ANTIMATTER FALL; ORDINARY MATTER; ACCELERATION; CONSTRAINTS; PARAMETERS; HADRONS; MODEL AB New tests of the weak equivalence principle for the antiproton and other hadrons are derived from a recent test of CPT symmetry in the K0K0BAR system using the MIT bag model. 40992969 RP HUGHES, RJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,P-15,LOS ALAMOS,NM 87545, USA. NR 26 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 15 PY 1992 VL 46 IS 6 BP R2283 EP R2286 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JN598 UT WOS:A1992JN59800002 ER PT J AU DU, M ROSENTHAL, SJ XIE, XL DIMAGNO, TJ SCHMIDT, M HANSON, DK SCHIFFER, M NORRIS, JR FLEMING, GR AF DU, M ROSENTHAL, SJ XIE, XL DIMAGNO, TJ SCHMIDT, M HANSON, DK SCHIFFER, M NORRIS, JR FLEMING, GR TI FEMTOSECOND SPONTANEOUS-EMISSION STUDIES OF REACTION CENTERS FROM PHOTOSYNTHETIC BACTERIA SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE ELECTRON TRANSFER; RHODOBACTER-SPHAEROIDES; RHODOBACTER-CAPSULATUS ID NONSUPEREXCHANGE COHERENT MECHANISM; INITIAL ELECTRON-TRANSFER; RHODOBACTER-SPHAEROIDES; CHARGE SEPARATION; DYNAMICS; SPECTROSCOPY; KINETICS AB Spontaneous emission from reaction centers of photosynthetic bacteria has been recorded with a time resolution of 50 fs. Excitation was made directly into both the special-pair band (850 nm) and the Q(x) band of bacteriochlorophylls (608 nm). Rhodobacter sphaeroides R26, Rhodobacter capsulatus wild type, and four mutants of Rb. capsulatus were studied. In all cases the fluorescence decay was not single exponential and was well fit as a sum of two exponential decay components. The short components are in excellent agreement with the single component detected by measurements of stimulated emission. The origin of the nonexponential decay is discussed in terms of heterogeneity, the kinetic scheme, and the possibility of slow vibrational relaxation. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. RP DU, M (reprint author), UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637, USA. FU NIGMS NIH HHS [GM36598] NR 35 TC 162 Z9 169 U1 0 U2 9 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 15 PY 1992 VL 89 IS 18 BP 8517 EP 8521 DI 10.1073/pnas.89.18.8517 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JN503 UT WOS:A1992JN50300023 PM 1528856 ER PT J AU GADBOIS, DM CRISSMAN, HA TOBEY, RA BRADBURY, EM AF GADBOIS, DM CRISSMAN, HA TOBEY, RA BRADBURY, EM TI MULTIPLE KINASE ARREST POINTS IN THE G1-PHASE OF NONTRANSFORMED MAMMALIAN-CELLS ARE ABSENT IN TRANSFORMED-CELLS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE KINASE INHIBITORS; CELL PROLIFERATION; GROWTH INHIBITION; FLOW CYTOMETRY ID YEAST SCHIZOSACCHAROMYCES-POMBE; POTENT INHIBITOR; PROTEIN-KINASES; DNA-SYNTHESIS; CYCLIC-AMP; STAUROSPORINE; G1; FIBROBLASTS; SYNCHRONIZATION; PROGRESSION AB We have shown that nontransformed mammalian cells arrest early in the G1 phase of the cell cycle when treated with exceedingly low concentrations of the nonspecific kinase inhibitor staurosporine, whereas transformed cells continue to progress through the cell cycle. We have now treated normal or transformed human skin fibroblasts with four other kinase inhibitors. Three of these inhibitors are highly specific: KT5720 inhibits cAMP-dependent protein kinase, KT5823 inhibits cGMP-dependent protein kinase, and KT5926 inhibits myosin light-chain kinase. The fourth inhibitor K252b has a moderate specificity for protein kinase C but also inhibits the three kinases just mentioned. We have found that these inhibitors reversibly arrest normal human skin fibroblasts at different times in the G1 phase but do not affect the cell cycle progression of transformed cells. The times of arrest within the G1 phase can be divided into two categories. Two of the inhibitors, KT5926 and K252b, act at an early time that is almost-equal-to 4 h after the transition from G0 to G1. The cAMP- and cGMP-dependent protein kinase inhibitors KT5720 and KT5823 arrest cells at a later time that is almost-equal-to 6 h after the G0/G1 boundary. These data indicate that there are multiple kinase-mediated phosphorylations of different substrates that are essential for the progression of normal cells, but not transformed cells, through the G1 phase. These inhibitors provide us with a set of biochemical probes that should be invaluable in the study of the function of kinases during G1 phase progression of normal cells. C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. RP GADBOIS, DM (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,MAIL STOP M880,LOS ALAMOS,NM 87545, USA. FU NCRR NIH HHS [P41-RR01315]; NIGMS NIH HHS [GM 45890] NR 29 TC 143 Z9 144 U1 0 U2 1 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 15 PY 1992 VL 89 IS 18 BP 8626 EP 8630 DI 10.1073/pnas.89.18.8626 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JN503 UT WOS:A1992JN50300045 PM 1528872 ER PT J AU HU, JG SEIDMAN, DN AF HU, JG SEIDMAN, DN TI RELATIONSHIP OF CHEMICAL-COMPOSITION AND STRUCTURE ON AN ATOMIC SCALE FOR METAL METAL INTERFACES - THE W(RE) SYSTEM SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID STRUCTURE-ENERGY CORRELATION; GRAIN-BOUNDARY STRUCTURES; MONTE-CARLO SIMULATIONS; 001 TWIST BOUNDARIES; DILUTE COBALT ALLOYS; INTERNAL INTERFACES; RESOLUTION OBSERVATIONS; PHASE-TRANSITIONS; STACKING-FAULTS; FCC METALS C1 NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP HU, JG (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,2225 SHERIDAN RD,EVANSTON,IL 60208, USA. RI Seidman, David/B-6697-2009 NR 40 TC 14 Z9 14 U1 0 U2 5 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 SEP 15 PY 1992 VL 27 IS 6 BP 693 EP 698 DI 10.1016/0956-716X(92)90490-6 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JJ734 UT WOS:A1992JJ73400009 ER PT J AU DING, YG CHAN, CT HO, KM AF DING, YG CHAN, CT HO, KM TI THEORETICAL INVESTIGATION OF THE STRUCTURE OF THE (ROOT-3X-ROOT-3R30-DEGREES-AU/SI(111) SURFACE SO SURFACE SCIENCE LA English DT Letter ID SCANNING TUNNELING MICROSCOPY; X SQUARE-ROOT-3-AG SURFACE; ION-SCATTERING SPECTROSCOPY; ENERGY ELECTRON-DIFFRACTION; AG/SI(111) SURFACE; 1ST-PRINCIPLES CALCULATIONS; RAY-DIFFRACTION; SI(111); AG; AU AB The structure of the (square-root 3 X square-root 3)R30-degrees-Au/Si(111) surface is investigated using first principles total energy calculations. Most models proposed by experiments have been tested. The lowest energy model is a conjugate honeycomb-chained-trimer (CHCT-1) configuration which consists of a top layer of trimers formed by Au atoms lying above a "missing top layer" Si(111) substrate with a honeycomb-chained-trimer structure for its first layer. The electronic charge densities from bands around the Fermi level give a good description of the images observed in STM experiments. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP DING, YG (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 41 TC 73 Z9 74 U1 2 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 15 PY 1992 VL 275 IS 3 BP L691 EP L696 DI 10.1016/0039-6028(92)90785-5 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JL935 UT WOS:A1992JL93500001 ER PT J AU SUGAMA, T CARCIELLO, N MIURA, M AF SUGAMA, T CARCIELLO, N MIURA, M TI FRACTAL POLYZIRCONOSILOXANE CLUSTER COATINGS SO THIN SOLID FILMS LA English DT Article ID GEL AB Fractal polyzirconosiloxane (PZS) cluster films were prepared through the hydrolysis-polycondensation pyrolysis synthesis of two-step HCl-acid NaOH base catalyzed sol precursors consisting of N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole, Zr(OC3H7)4, methanol, and water. When amorphous PZSs were applied to aluminum as protective coatings against NaCl-induced corrosion, the effective film was that derived from the sol having a pH of 8.6. The following four factors played an important role in assembling the PZS coating films: (1) a proper rate of condensation, (2) a moderate ratio of Si-O-Si to Si-O-Zr linkages formed in the PZS network, (3) hydrophobic characteristics, and (4) a specific microstructural geometry, in which large fractal clusters were linked together. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 17 TC 8 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD SEP 15 PY 1992 VL 216 IS 2 BP 249 EP 258 DI 10.1016/0040-6090(92)90846-4 PG 10 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA JP379 UT WOS:A1992JP37900010 ER PT J AU MCCOY, JD HONNELL, KG CURRO, JG SCHWEIZER, KS HONEYCUTT, JD AF MCCOY, JD HONNELL, KG CURRO, JG SCHWEIZER, KS HONEYCUTT, JD TI SINGLE-CHAIN STRUCTURE IN MODEL POLYETHYLENE MELTS SO MACROMOLECULES LA English DT Article ID INTEGRAL-EQUATION THEORY; NEUTRON-SCATTERING; POLYMER MELTS; LOCAL-STRUCTURE; POLYMETHYLENE; STATE AB The rotational isomeric state (RIS) model is usually considered to be an excellent description of the single-chain structure of polymer chains both in the melt and in THETA-solvents. The manifestation of this single-chain structure (commonly measured by scattering experiments) is the correlation function omega(r), which is the probability that two sites on the same chain are separated by a distance r. The evaluation of omega(r) from the RIS model requires laborious statistical averages, and, as a consequence, various approximations of omega(r) are of importance. Previous approximation schemes have focused on the long-wavelength regime. However, many physical phenomena and properties are very sensitive to local correlations and understanding such behavior requires an approximate omega(r) which is accurate on all length scales. We present such an approximation here and compare it to both computer simulation and previous, more coarse-grained approaches. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. BIOSYM TECHNOL INC,SAN DIEGO,CA 92121. RI McCoy, John/B-3846-2010 OI McCoy, John/0000-0001-5404-1404 NR 29 TC 26 Z9 26 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 14 PY 1992 VL 25 IS 19 BP 4905 EP 4910 DI 10.1021/ma00045a013 PG 6 WC Polymer Science SC Polymer Science GA JP275 UT WOS:A1992JP27500013 ER PT J AU BARNES, PD AF BARNES, PD TI SEARCH FOR THE H-PARTICLE - ITS PRODUCTION AND WEAK DECAY SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS / 20TH INTERNATIONAL SYMP OF THE INST FOR NUCLEAR STUDY OF THE UNIV OF TOKYO CY DEC 09-12, 1991 CL SHIMODA, JAPAN SP UNIV TOKYO, INST NUCL STUDY ID DIBARYON FORMATION; LATTICE QCD; HYPERNUCLEI AB Jaffe has suggested that a six-quark state with the flavor content of two-lambda hyperons with all spins coupled to zero, the H particle, may be bound against strong decay. This particle has become the object of extensive discussion in the literature and of several experimental searches. We report here the present status of an investigation of the reaction: (THETA-,d)atom --> H + n in experiment E-813 at the BNL-AGS and describe plans for future running in 1992. RP BARNES, PD (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 20 TC 16 Z9 16 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 SEP 14 PY 1992 VL 547 IS 1-2 BP C3 EP C15 PG 13 WC Physics, Nuclear SC Physics GA JV306 UT WOS:A1992JV30600004 ER PT J AU DOVER, CB AF DOVER, CB TI OPEN PROBLEMS AND FUTURE-PROSPECTS FOR HYPERNUCLEAR PHYSICS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS / 20TH INTERNATIONAL SYMP OF THE INST FOR NUCLEAR STUDY OF THE UNIV OF TOKYO CY DEC 09-12, 1991 CL SHIMODA, JAPAN SP UNIV TOKYO, INST NUCL STUDY ID BARYON-BARYON SCATTERING; EXCHANGE-POTENTIAL APPROACH; STRANGE-QUARK-MATTER; HYPERON NUCLEON-INTERACTION; LAMBDA-LAMBDA-HYPERNUCLEI; HEAVY-ION COLLISIONS; MODEL; SPECTROSCOPY; ENERGIES AB We appraise the current status of our knowledge of hypernuclear structure physics, and emphasize the unsolved problems. The prospects for significant advances in high resolution hypernuclear spectroscopy with CW electron beams at CEBAF or intense pion beams at the proposed PILAC facility at LAMPF are discussed. These facilities could greatly extend our understanding of strangeness S = -1 hypernuclear systems. For S = -2 systems, new events have been seen in a (K-, K+) hybrid counter-emulsion experiment at KEK in Japan. We give a theoretical interpretation of one of these events, as well as some further possibilities for the exploration of LAMBDALAMBDA hypernuclear spectroscopy via THETA--atoms. We mention some possible enhancements of (K-, K+) or (K-, K0) cross sections to discrete states, due to THETAN-LAMBDALAMBDA configuration mixing in a shell model description of S = -2 hypernuclei. Finally we explore the possibilities for producing multi strange nuclei or droplets of strange quark matter ("strangelets") in relativistic heavy ion collisions. RP DOVER, CB (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 45 TC 11 Z9 11 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 SEP 14 PY 1992 VL 547 IS 1-2 BP C27 EP C43 PG 17 WC Physics, Nuclear SC Physics GA JV306 UT WOS:A1992JV30600006 ER PT J AU GIBSON, BF AFNAN, IR AF GIBSON, BF AFNAN, IR TI NARROW STRUCTURE IN LAMBDA-D SCATTERING NEAR THE SIGMA-THRESHOLD (HE-3(SIGMA) STATES) SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS / 20TH INTERNATIONAL SYMP OF THE INST FOR NUCLEAR STUDY OF THE UNIV OF TOKYO CY DEC 09-12, 1991 CL SHIMODA, JAPAN SP UNIV TOKYO, INST NUCL STUDY ID HYPERNUCLEAR BOUND-STATE; SYSTEMS AB A separable-potential, Faddeev-type calculation of LAMBDA-deuteron scattering near the threshold for SIGMA production is shown to produce structure (a resonance peak) in the cross section which lies below the SIGMA threshold for two different YN (LAMBDAN - SIGMAN coupled-channel) potential models. In one case the SIGMAN N eigenvalue corresponds to a pole which lies below threshold (bound) and in the second case the pole lies above the threshold. C1 FLINDERS UNIV,SCH PHYS SCI,BEDFORD PK,SA 5042,AUSTRALIA. RP GIBSON, BF (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 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 SEP 14 PY 1992 VL 547 IS 1-2 BP C191 EP C196 PG 6 WC Physics, Nuclear SC Physics GA JV306 UT WOS:A1992JV30600025 ER PT J AU LUK, KB AF LUK, KB TI AN EXPERIMENTAL REVIEW OF HYPERON MAGNETIC-MOMENTS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS / 20TH INTERNATIONAL SYMP OF THE INST FOR NUCLEAR STUDY OF THE UNIV OF TOKYO CY DEC 09-12, 1991 CL SHIMODA, JAPAN SP UNIV TOKYO, INST NUCL STUDY ID VACUUM POLARIZATION SUBDIAGRAMS; PRECISE MEASUREMENT; 2ND-ORDER; ELECTRON; 4TH-ORDER; VERTICES AB Hyperon magnetic moments are important probes for studying the structure of baryons. In this talk, I shall briefly describe how the measurements are made and discuss the current status of the determinations. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP LUK, KB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 27 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 SEP 14 PY 1992 VL 547 IS 1-2 BP C291 EP C298 PG 8 WC Physics, Nuclear SC Physics GA JV306 UT WOS:A1992JV30600036 ER PT J AU THIESSEN, HA AF THIESSEN, HA TI PILAC - A PION LINAC FACILITY FOR 1-GEV PION PHYSICS AT LAMPF SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS / 20TH INTERNATIONAL SYMP OF THE INST FOR NUCLEAR STUDY OF THE UNIV OF TOKYO CY DEC 09-12, 1991 CL SHIMODA, JAPAN SP UNIV TOKYO, INST NUCL STUDY AB A design study for a Pion Linac (PILAC) at LAMPF is underway at Los Alamos. We present here a reference design for a system of pion source, linac, and high-resolution beam line and spectrometer that will provide 10(9) pions per second on target and 200-keV resolution for the (pi+,K+) reaction at 0.92 GeV. A general-purpose beam line that delivers both positive and negative pions in the energy range 0.4- 1.1 GeV is included, thus opening up the possibility of a broad experimental program as is discussed in this report. A kicker-based beam sharing system allows delivery of beam to both beamlines simultaneously with independent sign and energy control. Because the pion linac acts like an rf particle separator, all beams produced by PILAC will be free of electron (or positron) and proton contamination. RP THIESSEN, HA (reprint author), LOS ALAMOS NATL LAB,MAIL STOP H-847,LOS ALAMOS,NM 87545, USA. NR 4 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 SEP 14 PY 1992 VL 547 IS 1-2 BP C339 EP C345 PG 7 WC Physics, Nuclear SC Physics GA JV306 UT WOS:A1992JV30600042 ER PT J AU STUNTZ, LG AF STUNTZ, LG TI EDITORIAL CRITICISMS SO OIL & GAS JOURNAL LA English DT Letter RP STUNTZ, LG (reprint author), US DOE,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0030-1388 J9 OIL GAS J JI Oil Gas J. PD SEP 14 PY 1992 VL 90 IS 37 BP 9 EP 10 PG 2 WC Energy & Fuels; Engineering, Petroleum SC Energy & Fuels; Engineering GA JN334 UT WOS:A1992JN33400006 ER PT J AU CHAN, CT BOHNEN, KP HO, KM AF CHAN, CT BOHNEN, KP HO, KM TI INITIAL GROWTH MODE OF AU ON AG(110) STUDIED WITH 1ST-PRINCIPLES CALCULATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NORM-CONSERVING PSEUDOPOTENTIALS; SCATTERING AB We studied the initial growth mode of Au on Ag(110) using first-principles total energy calculations. We found that a recently observed bilayer growth mode in this system is not energetically favorable and thus may not be an equilibrium process. The most favorable initial growth process up to 1 monolayer Au coverage is found to proceed via subsurface substitution, which is an interesting growth mode for a metal-on-metal system. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST NUKL FESTKORPERPHYS,W-7500 KARLSRUHE 1,GERMANY. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP CHAN, CT (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 17 TC 57 Z9 57 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 SEP 14 PY 1992 VL 69 IS 11 BP 1672 EP 1675 DI 10.1103/PhysRevLett.69.1672 PG 4 WC Physics, Multidisciplinary SC Physics GA JM850 UT WOS:A1992JM85000013 ER PT J AU CHANG, HT YEUNG, ES AF CHANG, HT YEUNG, ES TI OPTIMIZATION OF SELECTIVITY IN CAPILLARY ZONE ELECTROPHORESIS VIA DYNAMIC PH GRADIENT AND DYNAMIC FLOW GRADIENT SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL SYMP ON HIGH PERFORMANCE CAPILLARY ELECTROPHORESIS ( HPCE 92 ) CY FEB 09-13, 1992 CL AMSTERDAM, NETHERLANDS ID STEP CHANGE; OPTION; ELECTROOSMOSIS; GENERATION; SEPARATION; ACID AB Two different techniques, dynamic pH gradient and electroosmotic flow gradient, were introduced to control selectivity in capillary zone electrophoresis. These two types of gradients showed dramatic effects on the resolution of organic acids. Dynamic pH gradient from pH 3.0 to 5.2 is readily generated by a high-performance liquid chromatography gradient pump. Electroosmotic flow gradient is produced by changing the reservoirs containing different concentrations of cetylammonium bromide for injection and running. The two gradient techniques are applied to the separation of model anions which are not resolved at constant pH or at constant flow conditions. C1 IOWA STATE UNIV SCI & TECHNOL,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 25 TC 36 Z9 39 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD SEP 11 PY 1992 VL 608 IS 1-2 BP 65 EP 72 DI 10.1016/0021-9673(92)87106-I PG 8 WC Chemistry, Analytical SC Chemistry GA JN980 UT WOS:A1992JN98000008 ER PT J AU YEUNG, ES WANG, PG LI, WN GIESE, RW AF YEUNG, ES WANG, PG LI, WN GIESE, RW TI LASER FLUORESCENCE DETECTOR FOR CAPILLARY ELECTROPHORESIS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL SYMP ON HIGH PERFORMANCE CAPILLARY ELECTROPHORESIS ( HPCE 92 ) CY FEB 09-13, 1992 CL AMSTERDAM, NETHERLANDS ID ZONE ELECTROPHORESIS AB A simple, rugged, and relatively inexpensive laser-based fluorometer for detection in capillary electrophoresis is described. This is assembled from commercially available components and requires minimal experience for operation. Yet, the detection performance is comparable to those achieved in laser laboratories with sophisticated layouts. As an example, detection of a 3 pM solution of fluorescein is demonstrated. The design principles of laser fluorometric detection are critically examined, and the special adaptation for the present detection arrangement is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NORTHEASTERN UNIV,COLL PHARM & ALLIED HLTH PROFESS,DEPT PHARMACEUT SCI,BOSTON,MA 02115. NORTHEASTERN UNIV,BARNETT INST CHEM ANAL & MAT SCI,BOSTON,MA 02115. RP YEUNG, ES (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 10 TC 77 Z9 77 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD SEP 11 PY 1992 VL 608 IS 1-2 BP 73 EP 77 DI 10.1016/0021-9673(92)87107-J PG 5 WC Chemistry, Analytical SC Chemistry GA JN980 UT WOS:A1992JN98000009 ER PT J AU CALDECOTT, KW TUCKER, JD THOMPSON, LH AF CALDECOTT, KW TUCKER, JD THOMPSON, LH TI CONSTRUCTION OF HUMAN XRCC1 MINIGENES THAT FULLY CORRECT THE CHO DNA-REPAIR MUTANT EM9 SO NUCLEIC ACIDS RESEARCH LA English DT Article ID SISTER CHROMATID EXCHANGE; CLONING; GENE AB The human gene that corrects the DNA repair defect of the CHO cell mutant EM9 is designated XRCC1 and is the first human gene to be cloned that has an established role in DNA strand-break repair. In this study, either an XRCC1 cosmid genomic fragment or synthetic oligonucleotides were ligated to an incomplete XRCC1 cDNA to generate two full-length XRCC1 cDNA constructs. The ability of these minigene constructs to restore normal levels of sister chromatid exchange (SCE) to EM9 upon transfection was demonstrated, and the transfectants grew at normal rates in selective medium that is fully toxic to EM9 cells. Constructs in which the XRCC1 open reading frame (ORF) was transcribed from the SV40 early promoter or the genomic XRCC1 native promoter were compared in their efficiency of correction. EM9 transfectants derived from the SV40 promoter displayed fewer SCEs and lower sensitivity to CldUrd than either AA8 wild-type cells or transfectants containing the ORF transcribed from the native promoter. C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. NR 10 TC 39 Z9 42 U1 0 U2 1 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 SEP 11 PY 1992 VL 20 IS 17 BP 4575 EP 4579 DI 10.1093/nar/20.17.4575 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JP423 UT WOS:A1992JP42300025 PM 1408759 ER PT J AU BAME, SJ BARRACLOUGH, BL FELDMAN, WC GISLER, GR GOSLING, JT MCCOMAS, DJ PHILLIPS, JL THOMSEN, MF GOLDSTEIN, BE NEUGEBAUER, M AF BAME, SJ BARRACLOUGH, BL FELDMAN, WC GISLER, GR GOSLING, JT MCCOMAS, DJ PHILLIPS, JL THOMSEN, MF GOLDSTEIN, BE NEUGEBAUER, M TI JUPITER MAGNETOSPHERE - PLASMA DESCRIPTION FROM THE ULYSSES FLYBY SO SCIENCE LA English DT Article ID EARTHS BOW SHOCK AB Plasma observations at Jupiter show that the outer regions of the Jovian magnetosphere are remarkably similar to those of Earth. Bow-shock precursor electrons and ions were detected in the upstream solar wind, as at Earth. Plasma changes across the bow shock and properties of the magnetosheath electrons were much like those at Earth, indicating that similar processes are operating. A boundary layer populated by a varying mixture of solar wind and magnetospheric plasmas was found inside the magnetopause, again as at Earth. In the middle magnetosphere, large electron density excursions were detected with a 10-hour periodicity as planetary rotation carried the tilted plasma sheet past Ulysses. Deep in the magnetosphere, Ulysses crossed a region, tentatively described as magnetically connected to the Jovian polar cap on one end and to the interplanetary magnetic field on the other. In the inner magnetosphere and lo torus, where corotation plays a dominant role, measurements could not be made because of extreme background rates from penetrating radiation belt particles. C1 JET PROP LAB,PASADENA,CA 91109. RP BAME, SJ (reprint author), LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,MS D438,LOS ALAMOS,NM 87545, USA. NR 12 TC 71 Z9 71 U1 0 U2 4 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 11 PY 1992 VL 257 IS 5076 BP 1539 EP 1543 DI 10.1126/science.257.5076.1539 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JM570 UT WOS:A1992JM57000031 PM 17776165 ER PT J AU KULSRUD, RM ANDERSON, SW AF KULSRUD, RM ANDERSON, SW TI THE SPECTRUM OF RANDOM MAGNETIC-FIELDS IN THE MEAN FIELD DYNAMO THEORY OF THE GALACTIC MAGNETIC-FIELD SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM MAGNETIC FIELDS; MHD; TURBULENCE ID TURBULENT AB We consider the fluctuation spectrum that must arise in a mean field dynamo generation of galactic fields if the initial field is weak. We derive and solve a kinetic equation for its evolution. The spectrum evolves by transfer of energy from one magnetic mode to another by interaction with turbulent velocity modes. This kinetic equation is valid in the limit that the rate of evolution of the magnetic modes is slower than the reciprocal decorrelation time of the turbulent modes. This turns out to be the case by a factor greater than 3. Most of the fluctuation energy concentrates on small scales, shorter than the hydrodynamic turbulent scales. The fluctuation energy builds up to equipartition with the turbulent energy in times that are short compared to the e-folding time of the mean field. The turbulence becomes strongly modified before the dynamo amplification starts. Thus, the kinematic assumption of the mean dynamo theory is invalid. It seems very difficult to build up magnetic fields from very weak seed fields on the galactic scale by dynamo action. Thus, the galactic field must have a primordial origin, although it may subsequently be modified by dynamo action. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. PLASMA PHYS LAB,PRINCETON,NJ 08544. RP KULSRUD, RM (reprint author), DEPT ASTROPHYS SCI,PEYTON HALL,PRINCETON,NJ 08544, USA. NR 11 TC 299 Z9 299 U1 0 U2 5 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1992 VL 396 IS 2 BP 606 EP 630 DI 10.1086/171743 PN 1 PG 25 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JL152 UT WOS:A1992JL15200018 ER PT J AU TIMMES, FX WOOSLEY, SE AF TIMMES, FX WOOSLEY, SE TI THE CONDUCTIVE PROPAGATION OF NUCLEAR FLAMES .1. DEGENERATE C+O AND O+NE+MG WHITE-DWARFS SO ASTROPHYSICAL JOURNAL LA English DT Article DE CONDUCTION; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS NEUTRON; WHITE DWARFS ID ACCRETION-INDUCED COLLAPSE; NEUTRON-STARS; DENSE MATTER; CARBON; EVOLUTION; PLASMA; SUPERNOVAE; DIFFUSION; IGNITION; PULSARS AB The physical properties-speed, width, and density structure-of conductive burning fronts in degenerate carbon-oxygen (C + O) and oxygen-neon-magnesium (O + Ne + Mg) compositions are determined for a grid of initial densities and compositions. Assuming a subsonic, isobaric nuclear flame, these properties are computed by four independent methods: a numerical radiation transport code which includes implicit hydrodynamics; a moving mesh diffusion code; an eigenvalue method; and a quasi-analytical, integral expression. The dependence of the physical properties of the flame on the assumed values of nuclear reaction rates, the nuclear reaction network employed, the thermal conductivity, and the choice of coordinate system are all investigated. The new results have implications for the formation of neutron stars by the accretion-induced collapse (AIC) of a white dwarf and for the production of Type Ia supernovae. The occurrence of AIC is critically dependent on the velocity of the nuclear conductive burning front and the growth rate of hydrodynamic instabilities. However, electron capture in nuclear statistical equilibrium behind the flame causes the density to increase (at constant pressure), restoring the density to its initial value some distance behind the front. There consequently exists a maximum length scale for the development of hydrodynamic instabilities. Treating the expanding area of the turbulent burning region as a fractal whose tile size is identical to the minimum unstable Rayleigh-Taylor wavelength, we find, for all reasonable values of the fractal dimension, that for initial C + O or 0 + Ne + M densities above about 9 x 10(9) cm-3 the white dwarf should colla se to a neutron star. C1 LAWRENCE LIVERMORE NATL LAB, GEN STUDIES GRP, LIVERMORE, CA 94550 USA. RP UNIV CALIF SANTA CRUZ, LICK OBSERV, LICK OBSERV, BOARD STUDIES ASTRON & ASTROPHYS, MT HAMILTON, CA 95140 USA. NR 96 TC 189 Z9 190 U1 1 U2 7 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1992 VL 396 IS 2 BP 649 EP 667 DI 10.1086/171746 PN 1 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JL152 UT WOS:A1992JL15200021 ER PT J AU CADILLA, C ISHAM, KR LEE, KL CHANG, LY JOHNSON, AC KENNEY, FT AF CADILLA, C ISHAM, KR LEE, KL CHANG, LY JOHNSON, AC KENNEY, FT TI INSULIN INCREASES TRANSCRIPTION OF RAT GENE-33 THROUGH CIS-ACTING ELEMENTS IN 5'-FLANKING DNA SO GENE LA English DT Article DE STABLE TRANSFECTION; REPORTER GENE; HEPATOMA CELLS; NUCLEAR EXTRACTS; INVITRO TRANSCRIPTION ID MESSENGER RIBONUCLEIC-ACID; GROWTH-HORMONE GENE; PHOSPHOENOLPYRUVATE CARBOXYKINASE; CHLORAMPHENICOL ACETYLTRANSFERASE; HEPATOMA-CELLS; GLYCERALDEHYDE-3-PHOSPHATE DEHYDROGENASE; ENHANCER ELEMENTS; MAMMALIAN-CELLS; TRANSGENIC MICE; CULTURED-CELLS AB Gene 33 is a multihormonally-regulated rat gene whose transcription is rapidly and markedly enhanced by insulin in liver and cultured hepatoma cells. To examine the mechanism by which insulin regulates transcription, we have constructed chimeric plasmids in which expression of the bacterial cat gene, encoding chloramphenicol acetyltransferase (CAT), is governed by gene 33 promoter elements and contiguous sequences in DNA flanking the transcription start point (tsp). When transfected into H4IIE hepatoma cells, these constructs gave rise to stably transformed cell lines producing the bacterial CAT enzyme. This expression was increased by insulin treatment in a fashion resembling the effect of this hormone on transcription of the native gene. In vitro transcription assays in nuclear extracts also revealed increased transcription of the chimeric plasmids when the extracts were prepared from insulin-treated rat hepatoma cells. The results demonstrate that induction by insulin is mediated by cis-acting nucleotide sequences located between bp -480 to +27 relative to the tsp. C1 OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. NCI,MOLEC BIOL LAB,BETHESDA,MD 20892. FU NCI NIH HHS [T32 CA 09336] NR 38 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1119 J9 GENE JI Gene PD SEP 10 PY 1992 VL 118 IS 2 BP 223 EP 229 DI 10.1016/0378-1119(92)90192-R PG 7 WC Genetics & Heredity SC Genetics & Heredity GA JM798 UT WOS:A1992JM79800009 PM 1511896 ER PT J AU ROBERTS, CD WILLIAMS, AG KREIN, G AF ROBERTS, CD WILLIAMS, AG KREIN, G TI ON THE IMPLICATIONS OF CONFINEMENT SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article AB We consider some implications of confinement starting from the basic observation that cross-sections for the production of colored asymptotic states, such as free quarks and gluons, from color singlet initial states must be zero if QCD is to be confining. We discuss two pictures of confinement: the failure of the cluster decomposition property and the absence of a pole at timelike momenta in the propagator of a confined particle. We use QCD-based models as a framework to relate the failure of the cluster decomposition property to other ideas, such as the role of a nonzero gluon condensate. Our primary interest is to address the question of the absence of a mass pole through a study of model Schwinger-Dyson equations. These equations contain some of the dynamical information that is present in the study of the cluster decomposition property. We discuss the problems with this idea and its study using the Schwinger-Dyson equations. RP ROBERTS, CD (reprint author), ARGONNE NATL LAB,DIV PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Williams, Anthony/I-6698-2012; Krein, Gastao/C-1204-2012 OI Krein, Gastao/0000-0003-1713-8578 NR 0 TC 120 Z9 120 U1 1 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 SEP 10 PY 1992 VL 7 IS 22 BP 5607 EP 5624 DI 10.1142/S0217751X92002544 PG 18 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JP036 UT WOS:A1992JP03600009 ER PT J AU GOLDSTEIN, P WALTER, WR ZANDT, G AF GOLDSTEIN, P WALTER, WR ZANDT, G TI UPPER MANTLE STRUCTURE BENEATH CENTRAL EURASIA USING A SOURCE ARRAY OF NUCLEAR-EXPLOSIONS AND WAVE-FORMS AT REGIONAL DISTANCES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID INVERSION; MODEL; WAVES; USSR; CODA AB We have observed very consistent broadband, regional, three-component P waveforms from a set of 11 explosions that occurred at the former Soviet test site in Kazakhstan during 1988 and 1989 and have modeled most of the prominent features in these waveforms to determine upper mantle structure beneath central Eurasia. Using a subset of events as a source array, we have identified four consistent arrivals during the first 15 s of P waves recorded at the Soviet/Incorporated Research Institutions for Seismology (IRIS) stations Arti (ARU) (d almost-equal-to 1500 km) and Garm (GAR) (d almost-equal-to 1380 km). These arrivals show consistent variations in frequency content, relative timing, and amplitudes from event to event despite a range in source magnitude (m(b)) between 4.9 and 6.1. We have also identified consistent features in P waveforms of these events recorded at Obninsk (OBN) (d almost-equal-to 2880 km). We argue that most of the prominent features in these waveforms can be explained by reflections at or refractions near discontinuities or large velocity gradients in the upper mantle. We show that a model with discontinuities of approximately 3.0% and 6.5% near 200 km and 400 km, respectively, produces a better fit to the broadband data at ARU and GAR than previous models for this region. This model also produces a good match to waveforms recorded at OBN and NORESS, however, this model is not unique. For example, we show that it is also possible to produce similar waveforms by replacing the 200 km discontinuity with a large, notch shaped, low velocity zone between approximately 100 and 140 km. Based on reflectivity synthetics, we suggest that additional data, especially from distances less than 1000 km, should indicate which of these models is more accurate. Although our models are not unique, our observations do constrain the following features. (1) There must be reflectors between about 140 and 200 km and near 400 km depth in the upper mantle to explain the large secondary arrivals at both ARU and GAR. (2) Based on the relative size of some of the secondary arrivals at ARU and GAR, the discontinuity near 400 km must be large. However, it cannot be much greater than about 6.5% because there is no evidence, in our data, of a reflection from 400 km at OBN. (3) The relatively small amplitude of the first arrivals at both ARU and GAR suggests that either the gradient in the uppermost mantle is very small or that a shallow low velocity zone is present. Comparison of our results with other upper mantle studies shows that the central Eurasian upper mantle is similar to the upper mantle of the central and eastern United States. RP GOLDSTEIN, P (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,L-205,POB 808,LIVERMORE,CA 94550, USA. RI Walter, William/C-2351-2013 OI Walter, William/0000-0002-0331-0616 NR 34 TC 24 Z9 24 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-SOL EA JI J. Geophys. Res.-Solid Earth PD SEP 10 PY 1992 VL 97 IS B10 BP 14097 EP 14113 DI 10.1029/92JB01205 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JM870 UT WOS:A1992JM87000012 ER PT J AU DELATTRE, O ZUCMAN, J PLOUGASTEL, B DESMAZE, C MELOT, T PETER, M KOVAR, H JOUBERT, I DEJONG, P ROULEAU, G AURIAS, A THOMAS, G AF DELATTRE, O ZUCMAN, J PLOUGASTEL, B DESMAZE, C MELOT, T PETER, M KOVAR, H JOUBERT, I DEJONG, P ROULEAU, G AURIAS, A THOMAS, G TI GENE FUSION WITH AN ETS DNA-BINDING DOMAIN CAUSED BY CHROMOSOME-TRANSLOCATION IN HUMAN TUMORS SO NATURE LA English DT Article ID EWINGS-SARCOMA; RECIPROCAL TRANSLOCATION; MYXOID CHONDROSARCOMA; PROTEINS; ERYTHROLEUKEMIA; REARRANGEMENTS; CONSISTENCY; T(11-22); VIRUS AB EWING'S sarcoma and related subtypes of primitive neuroectodermal tumours share a recurrent and specific t(11; 22) (q24; q12) chromosome translocation1-8, the breakpoints of which have recently been cloned9. Phylogenetically conserved restriction fragments in the vicinity of EWSR1 and EWSR2, the genomic regions where the breakpoints of chromosome 22 and chromosome 11 are, respectively, have allowed identification of transcribed sequences from these regions and has indicated that a hybrid transcript might be generated by the translocation9. Here we use these fragments to screen human complementary DNA libraries to show that the translocation alters the open reading frame of an expressed gene on chromosome 22 gene by substituting a sequence encoding a putative RNA-binding domain for that of the DNA-binding domain of the human homologue of murine Fli-1. C1 INST CURIE,GENET TUMEURS LAB,26 RUE ULM,F-75231 PARIS 05,FRANCE. ST ANNA CHILDRENS HOSP,CHILDRENS CANC RES INST,A-1090 VIENNA,AUSTRIA. MCGILL UNIV,CTR RECH NEUROSCI,MONTREAL H3G 1A4,QUEBEC,CANADA. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94550. INST CURIE,CNRS,URA 620,F-75231 PARIS 05,FRANCE. NR 34 TC 1170 Z9 1186 U1 11 U2 35 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD SEP 10 PY 1992 VL 359 IS 6391 BP 162 EP 165 DI 10.1038/359162a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JM494 UT WOS:A1992JM49400058 PM 1522903 ER PT J AU KURKISUONIO, H AUFDERHEIDE, MB GRAZIANI, F MATHEWS, GJ BANERJEE, B CHITRE, SM SCHRAMM, DN AF KURKISUONIO, H AUFDERHEIDE, MB GRAZIANI, F MATHEWS, GJ BANERJEE, B CHITRE, SM SCHRAMM, DN TI DIFFUSION-COEFFICIENTS AND INHOMOGENEOUS BIG-BANG NUCLEOSYNTHESIS SO PHYSICS LETTERS B LA English DT Article ID HADRON PHASE-TRANSITION; BARYON-NUMBER FLUCTUATIONS; PRIMORDIAL NUCLEOSYNTHESIS; NEUTRON DIFFUSION; EARLY UNIVERSE AB We study the effects of recently calculated baryon diffusion coefficients on the yields of primordial light elements in baryon-inhomogeneous big-bang models. The new coefficients are an improvement over previously used values in that they go to the correct nonrelativistic limit for neutron-electron scattering and give a more correct numerical value for the nucleon-nucleon scattering contribution. The largest effect of these new coefficients on nucleosynthesis is through neutron-proton scattering. We find that the somewhat larger value for D(np) in the present work shifts the optimum separation distance between fluctuations, at which the effects of inhomogeneities are maximized, to slightly larger distance scales. Otherwise, the nucleosynthesis yields derived using these new diffusion coefficients are similar to those obtainted previously thereby confirming the robustness of earlier derived constraints. C1 TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. UNIV CHICAGO,CHICAGO,IL 60637. UNIV CHICAGO,CHICAGO,IL 60637. FERMILAB ASTROPHYS,BATAVIA,IL 60510. RP KURKISUONIO, H (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Kurki-Suonio, Hannu/B-8502-2016 OI Kurki-Suonio, Hannu/0000-0002-4618-3063 NR 24 TC 11 Z9 11 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 SEP 10 PY 1992 VL 289 IS 3-4 BP 211 EP 216 DI 10.1016/0370-2693(92)91207-P PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT998 UT WOS:A1992JT99800001 ER PT J AU ZAMFIR, NV VONBRENTANO, P AF ZAMFIR, NV VONBRENTANO, P TI E1 TRANSITION RATES IN TRANSITIONAL SM-148-152 ISOTOPES IN THE IBA-SDF MODEL SO PHYSICS LETTERS B LA English DT Article ID INTERACTING BOSON MODEL; STATES; NUCLEI AB The E1 transition rates in Sm isotopes with neutron number N = 86-90 are studied in the frame of the (sd)NB-1f interacting boson model. An effective E1 operator, obtained bye eliminating, by perturbation theory, the p boson from the spdf model, explains very well the E1 data in this transitional region. C1 INST ATOM PHYS,R-76900 BUCHAREST,ROMANIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP ZAMFIR, NV (reprint author), UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. RI Zamfir, Nicolae Victor/F-2544-2011 NR 13 TC 9 Z9 9 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 SEP 10 PY 1992 VL 289 IS 3-4 BP 245 EP 248 DI 10.1016/0370-2693(92)91213-S PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT998 UT WOS:A1992JT99800007 ER PT J AU GARVEY, GT KREWALD, S KOLBE, E LANGANKE, K AF GARVEY, GT KREWALD, S KOLBE, E LANGANKE, K TI STRANGE QUARK CONTRIBUTIONS TO NEUTRINO INDUCED QUASI-ELASTIC SCATTERING SO PHYSICS LETTERS B LA English DT Article ID OPPOSITE-SIGN DIMUONS; MAGNETIC-MOMENT; PROTON; NUCLEON; SPIN AB We propose that measuring the ratio of proton-to-neutron neutrino-induced quasielastic yield is a sensitive way to determine the strange quark axial form factor of the nucleon. This form factor is determined by the ssBAR contribution to the nucleon spin. C1 UNIV MUNSTER, INST THEORET PHYS 1, W-4400 MUNSTER, GERMANY. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP GARVEY, GT (reprint author), FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH 1, GERMANY. OI Krewald, Siegfried/0000-0002-8596-8429 NR 15 TC 43 Z9 43 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 SEP 10 PY 1992 VL 289 IS 3-4 BP 249 EP 254 DI 10.1016/0370-2693(92)91214-T PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT998 UT WOS:A1992JT99800008 ER PT J AU WINCHELL, DF LUDWIGSEN, DO GARRETT, JD AF WINCHELL, DF LUDWIGSEN, DO GARRETT, JD TI THE MASS DEPENDENCE OF MOMENTS OF INERTIA OF RAPIDLY-ROTATING NUCLEI SO PHYSICS LETTERS B LA English DT Article ID PARTICLE AB An analysis of high-spin moments of inertia for the yrast sequences of deformed nuclei from A = 72-184 indicates that within each deformed mass region, the moment of inertia is surprisingly constant. In contrast, between the different deformed mass regions the A5/3 dependence of the moment of inertia, expected for a macroscopic rotor, is approximately restored. RP WINCHELL, DF (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 14 TC 7 Z9 7 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 10 PY 1992 VL 289 IS 3-4 BP 267 EP 270 DI 10.1016/0370-2693(92)91217-W PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT998 UT WOS:A1992JT99800011 ER PT J AU RAITEN, E AF RAITEN, E TI ASYMPTOTIC-BEHAVIOR OF 2D BLACK-HOLES SO PHYSICS LETTERS B LA English DT Article AB We consider solutions of the field equations for the large N dilaton gravity model in 1 + 1 dimensions of Callan, Giddings, Harvey, and Strominger (CGHS). We find time dependent solutions in the weak coupling region with finite mass and vanishing flux, as well as solutions which lie entirely in the Liouville region. RP RAITEN, E (reprint author), FERMI NATL ACCELERATOR LAB,THEORY GRP,MS106,POB 500,BATAVIA,IL 60510, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 10 PY 1992 VL 289 IS 3-4 BP 287 EP 292 DI 10.1016/0370-2693(92)91221-T PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT998 UT WOS:A1992JT99800015 ER PT J AU PACIELLO, ML PARRINELLO, C PETRARCA, S TAGLIENTI, B VLADIKAS, A AF PACIELLO, ML PARRINELLO, C PETRARCA, S TAGLIENTI, B VLADIKAS, A TI GRIBOV COPIES AND SMEARED CORRELATION-FUNCTIONS IN LATTICE QCD SO PHYSICS LETTERS B LA English DT Article ID ABELIAN GAUGE THEORIES; AMBIGUITY; MASS AB We study the influence of Gribov copies in the Coulomb gauge on the smeared hadronic correlation functions that are involved in the determination of the B meson decay constant. We find that the residual gauge freedom associated to Gribov copies induces observable noise effects, though at the level of numerical accuracy of our simulation these effects are not relevant to the final determination of f(B). Our results indicate that such effects may become important on bigger lattices. C1 UNIV ROME LA SAPIENZA,DIPARTIMENTO FIS,I-00185 ROME,ITALY. NYU,DEPT PHYS,NEW YORK,NY 10003. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP PACIELLO, ML (reprint author), IST NAZL FIS NUCL,PIAZZALE A MORO 2,I-00185 ROME,ITALY. OI Petrarca, Silvano/0000-0002-0352-9132 NR 26 TC 17 Z9 17 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 SEP 10 PY 1992 VL 289 IS 3-4 BP 405 EP 410 DI 10.1016/0370-2693(92)91240-A PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT998 UT WOS:A1992JT99800034 ER PT J AU BALTISBERGER, JH GANN, SL WOOTEN, EW CHANG, TH MUELLER, KT PINES, A AF BALTISBERGER, JH GANN, SL WOOTEN, EW CHANG, TH MUELLER, KT PINES, A TI RB-87 DYNAMIC-ANGLE SPINNING NMR-SPECTROSCOPY OF INORGANIC RUBIDIUM SALTS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID PURE-ABSORPTION-PHASE; QUADRUPOLAR NUCLEI; COUPLING-CONSTANTS; MAS-NMR; NITRATE; CESIUM AB Five inorganic rubidium salts, RbCl, RbClO4, Rb2SO4, Rb2CrO4, and RbNO3, were examined using Rb-87 NMR spectroscopy. Significant line narrowing occurs under dynamic-angle spinning (DAS) compared to magic-angle spinning (MAS) or variable-angle spinning (VAS). From DAS spectra acquired at various magnetic field strengths, isotropic chemical shifts and isotropic second-order quadrupolar shifts were obtained. By simulations of single-site line shapes obtained from MAS-detected DAS experiments, complete chemical shift and quadrupolar parameters were determined for each of the three crystallographically distinct rubidium sites in RbNO3. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Mueller, Karl/A-3637-2010 NR 28 TC 42 Z9 42 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 9 PY 1992 VL 114 IS 19 BP 7489 EP 7493 DI 10.1021/ja00045a023 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA JM979 UT WOS:A1992JM97900023 ER PT J AU ATWOOD, JL CLARK, DL JUNEJA, RK ORR, GW ROBINSON, KD VINCENT, RL AF ATWOOD, JL CLARK, DL JUNEJA, RK ORR, GW ROBINSON, KD VINCENT, RL TI DOUBLE PARTIAL CONE CONFORMATION FOR NA8(CALIX[6]ARENE SULFONATE).20 5H2O AND ITS PARENT ACID SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CALIXARENE-BASED URANOPHILES; MOLECULAR-STRUCTURE; FUNCTIONALIZED MACROCYCLES; TRANSITION-METAL; HOST MOLECULES; CRYSTAL; CALIX<4>ARENES; INCLUSION; CALIX<6>ARENE; COORDINATION C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. RP ATWOOD, JL (reprint author), UNIV ALABAMA,DEPT CHEM,TUSCALOOSA,AL 35487, USA. RI Clark, David/A-9729-2011 NR 25 TC 110 Z9 111 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 SEP 9 PY 1992 VL 114 IS 19 BP 7558 EP 7559 DI 10.1021/ja00045a035 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA JM979 UT WOS:A1992JM97900035 ER PT J AU PRIESTLEY, ND FLOSS, HG FROLAND, WA LIPSCOMB, JD WILLIAMS, PG MORIMOTO, H AF PRIESTLEY, ND FLOSS, HG FROLAND, WA LIPSCOMB, JD WILLIAMS, PG MORIMOTO, H TI CRYPTIC STEREOSPECIFICITY OF METHANE MONOOXYGENASE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID METHYLOSINUS-TRICHOSPORIUM OB3B; HYDROXYLASE COMPONENT; MECHANISTIC IMPLICATIONS; HYDROCARBONS; OXYGENATION; OXIDATION C1 UNIV WASHINGTON, DEPT CHEM BG10, SEATTLE, WA 98195 USA. UNIV MINNESOTA, SCH MED, DEPT BIOCHEM, MINNEAPOLIS, MN 55455 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. OI Lipscomb, John/0000-0002-8158-5594 NR 22 TC 133 Z9 133 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 9 PY 1992 VL 114 IS 19 BP 7561 EP 7562 DI 10.1021/ja00045a037 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA JM979 UT WOS:A1992JM97900037 ER PT J AU DATTA, R HALLAHAN, DE KHARBANDA, SM RUBIN, E SHERMAN, ML HUBERMAN, E WEICHSELBAUM, RR KUFE, DW AF DATTA, R HALLAHAN, DE KHARBANDA, SM RUBIN, E SHERMAN, ML HUBERMAN, E WEICHSELBAUM, RR KUFE, DW TI INVOLVEMENT OF REACTIVE OXYGEN INTERMEDIATES IN THE INDUCTION OF C-JUN GENE-TRANSCRIPTION BY IONIZING-RADIATION SO BIOCHEMISTRY LA English DT Article ID PROTEIN-KINASE-C; MYELOID-LEUKEMIA CELLS; DNA-BINDING ACTIVITY; HUMAN-IMMUNODEFICIENCY-VIRUS; FACTOR-KAPPA-B; MONOCYTIC DIFFERENTIATION; N-ACETYLCYSTEINE; GROWTH-FACTORS; FOS GENE; EXPRESSION AB Previous work has demonstrated that the cellular response to ionizing radiation includes transcriptional activation of the c-jun gene. The signaling events responsible for this response, however, remain unclear. The present studies have examined the effects of ionizing radiation on c-jun expression in a variant of HL-60 cells, designated HL-525, which is deficient in protein kinase C (PKC)-mediated signal transduction. The results demonstrate that these cells express low levels of PKC-alpha and PKC-beta-transcripts and exhibit an attenuated induction of c-jun expression following treatment with 12-O-tetradecanoylphorbol-13-acetate (TPA). In contrast, HL-525 cells respond to ionizing radiation with an increase in c-jun mRNA which is more pronounced than that in wild-type HL-60 cells. These cells similarly respond to ionizing radiation with increased expression of the jun-B, jun-D, c-fos, and fos-B genes. Nuclear run-on assays demonstrate that X-ray-induced c-jun expression in HL-525 cells is regulated by increases in the rate of c-jun gene transcription. Moreover, mRNA stability studies in irradiated HL-525 cells demonstrate that the half-life of c-jun transcripts is prolonged compared to that in wild-type cells. Studies with N-acetyl-L-cysteine (NAC), an antioxidant, suggest that X-ray-induced transcriptional activation of the c-jun gene is mediated at least in part through the formation of reactive oxygen intermediates (ROIs). In this context, H2O2 also induced c-jun expression in HL-525 cells, and this effect was inhibited by NAC. We further demonstrate that the induction of c-jun expression by X-rays, as well as H2O2, is inhibited (1) by prolonged exposure to TPA or bryostatin and (2) by H7, a nonspecific inhibitor of PKC-like protein kinases, but not HA1004, a more selective inhibitor of cyclic nucleotide-dependent protein kinase activity. Taken together, these results indicate that ionizing radiation induces c-jun gene transcription through the formation of ROIs and that a protein kinase, perhaps a PKC isoform distinct from PKC-alpha and PKC-beta, is also involved in this signaling pathway. C1 HARVARD UNIV,SCH MED,DANA FARBER CANC INST,CLIN PHARMACOL LAB,BOSTON,MA 02115. UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. UNIV CHICAGO,PRITZKER SCH MED,CHICAGO,IL 60637. UNIV CHICAGO,DEPT MOLEC GENET & CELL BIOL,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. FU NCI NIH HHS [CA41068, CA55241] NR 49 TC 165 Z9 165 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 SEP 8 PY 1992 VL 31 IS 35 BP 8300 EP 8306 DI 10.1021/bi00150a025 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JM572 UT WOS:A1992JM57200025 PM 1525167 ER PT J AU SOSNICK, TR TREWHELLA, J AF SOSNICK, TR TREWHELLA, J TI DENATURED STATES OF RIBONUCLEASE-A HAVE COMPACT DIMENSIONS AND RESIDUAL SECONDARY STRUCTURE SO BIOCHEMISTRY LA English DT Article ID BOVINE PANCREATIC RIBONUCLEASE; MOLTEN-GLOBULE STATE; CIRCULAR-DICHROISM; ALPHA-LACTALBUMIN; PROTEINS; SPECTROSCOPY; INTERMEDIATE; TRANSITION; SCATTERING; FRAMEWORK AB Using small-angle X-ray scattering and Fourier transform infrared spectroscopy, we have determined that the thermally denatured state of native ribonuclease A is on average a compact structure having residual secondary structure. Under strongly reducing conditions, the protein further unfolds into a looser structure with larger dimensions but still retains a comparable amount of secondary structure. The dimensions of the thermally and chemically denatured states of the reduced protein are different but both are more compact than is predicted for a random coil of the same length. These results demonstrate that thermal denaturation in ribonuclease A is not a simple two-state transition from a native to a completely disordered random coil state. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. OI Trewhella, Jill/0000-0002-8555-6766 NR 38 TC 166 Z9 168 U1 0 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 SEP 8 PY 1992 VL 31 IS 35 BP 8329 EP 8335 DI 10.1021/bi00150a029 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JM572 UT WOS:A1992JM57200029 PM 1525171 ER PT J AU BATKO, G RANDRUP, J VETTER, T AF BATKO, G RANDRUP, J VETTER, T TI EFFECT OF N-BODY COLLISIONS ON SUBTHRESHOLD KAON PRODUCTION IN HIGH-ENERGY NUCLEAR-REACTIONS SO NUCLEAR PHYSICS A LA English DT Article ID HEAVY-ION COLLISIONS; EQUATION; STATE AB We recently generalized the standard BUU transport model to incorporate N-body collisions. This model has now been further developed so as to allow the calculation of the energy spectra of kaons produced in nuclear reactions at relativistic energies. Applications to the systems Ca+Ca, Nb+Nb, and Au+Au at bombarding energies of 600 and 1000 MeV per nucleon suggest that the effect of N-body collisions on the kaon spectra is relatively minor. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI 70A3307,BERKELEY,CA 94720. GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY. UNIV GIESSEN,INST THEORET PHYS,W-6300 GIESSEN,GERMANY. NR 22 TC 10 Z9 10 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 SEP 7 PY 1992 VL 546 IS 4 BP 761 EP 772 DI 10.1016/0375-9474(92)90006-6 PG 12 WC Physics, Nuclear SC Physics GA JP026 UT WOS:A1992JP02600005 ER PT J AU RUSSO, JG TSEYTLIN, AA AF RUSSO, JG TSEYTLIN, AA TI SCALAR TENSOR QUANTUM-GRAVITY IN 2 DIMENSIONS SO NUCLEAR PHYSICS B LA English DT Article ID STRING THEORY; FIELD-THEORY; QUANTIZATION AB We discuss some classical and quantum properties of 2d gravity models involving metric and a scalar field. Different models are parametrized in terms of a scalar potential. We show that a general Liouville-type model with exponential potential and linear curvature coupling is renormalisable at the quantum level while a particular model (corresponding to D = 2 graviton-dilaton string effective action and having a back-hole solution) is finite. We use the condition of a "split" Weyl symmetry to suggest possible expressions for the "effective action" which includes the quantum anomaly term. C1 UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,CAMBRIDGE CB3 9EW,ENGLAND. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP RUSSO, JG (reprint author), STANFORD UNIV,DEPT PHYS,THEORY GRP,STANFORD,CA 94305, USA. RI Tseytlin, Arkady/M-5045-2015; OI Tseytlin, Arkady/0000-0002-5066-8282; Russo, Jorge Guillermo/0000-0002-3023-1833 NR 29 TC 89 Z9 89 U1 0 U2 1 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 SEP 7 PY 1992 VL 382 IS 2 BP 259 EP 275 DI 10.1016/0550-3213(92)90187-G PG 17 WC Physics, Particles & Fields SC Physics GA JP504 UT WOS:A1992JP50400005 ER PT J AU HOLMAN, R HSU, SDH KOLB, EW WATKINS, R WIDROW, LM AF HOLMAN, R HSU, SDH KOLB, EW WATKINS, R WIDROW, LM TI COSMOLOGICAL TEXTURE IS SENSITIVE TO PLANCK-SCALE PHYSICS SO PHYSICAL REVIEW LETTERS LA English DT Article ID GLOBAL TEXTURE; CONSTANT; ORIGIN AB Nambu-Goldstone modes are sensitive to the effects of physics at energies comparable to the scale of spontaneous symmetry breaking. We show that as a consequence of this the global texture proposal for structure formation requires rather severe assumptions about the nature of physics at the Planck scale. C1 CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138. NASA,FERMILAB ASTROPHYS,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV TORONTO,CANADIAN INST THEORET ASTROPHYS,TORONTO M5S 1A1,ONTARIO,CANADA. RP HOLMAN, R (reprint author), UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106, USA. NR 26 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 7 PY 1992 VL 69 IS 10 BP 1489 EP 1492 DI 10.1103/PhysRevLett.69.1489 PG 4 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000004 ER PT J AU BAKTASH, C GARRETT, JD WINCHELL, DF SMITH, A AF BAKTASH, C GARRETT, JD WINCHELL, DF SMITH, A TI LOW-SPIN IDENTICAL BANDS IN NEIGHBORING ODD-A AND EVEN-EVEN NUCLEI - A POSSIBLE CHALLENGE TO MEAN-FIELD THEORIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERDEFORMED BANDS; TRANSITION ENERGIES; ALIGNMENT; SYMMETRY AB A comprehensive study of odd-A rotational bands in normally deformed rare-earth nuclei indicates that a large number of seniority-one configurations (30% for odd-Z nuclei) at low spin have moments of inertia nearly identical to that of the seniority-zero configuration of the neighboring even-even nucleus with one less nucleon. It is difficult to reconcile these results with conventional models of nuclear pair correlation, which predict variations of about 15% in the moments of inertia of configurations differing by one unit in seniority. RP BAKTASH, C (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 16 TC 66 Z9 66 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 SEP 7 PY 1992 VL 69 IS 10 BP 1500 EP 1503 DI 10.1103/PhysRevLett.69.1500 PG 4 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000007 ER PT J AU LANGENBRUNNER, J JONES, MK DEHNHARD, D MORRIS, CL GIBBS, WR AF LANGENBRUNNER, J JONES, MK DEHNHARD, D MORRIS, CL GIBBS, WR TI EVIDENCE FOR DIRECT TRITON KNOCKOUT IN THE HE-4(PI,PI'T)P REACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUASI-FREE; SCATTERING AB Angular correlation functions for the He-4(pi+/-, pi+/-'t)p reaction at the incident energy T(x)=180 MeV and at four pion scattering angles have been measured. The He-4(pi+/-, pi+/-'t)p data complement previous He-4(pi+/-, pi+/-'p)t results by greatly extending the available range of proton emission angles. We calculate angular correlation functions of the cross sections with three different quasifree knockout models, and we show that direct triton knockout is crucial to an understanding of the data. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NEW MEXICO STATE UNIV,DEPT PHYS,LAS CRUCES,NM 88003. RP LANGENBRUNNER, J (reprint author), UNIV MINNESOTA,DEPT PHYS,MINNEAPOLIS,MN 55455, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 7 PY 1992 VL 69 IS 10 BP 1508 EP 1511 DI 10.1103/PhysRevLett.69.1508 PG 4 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000009 ER PT J AU MARTIN, JE ODINEK, J HALSEY, TC AF MARTIN, JE ODINEK, J HALSEY, TC TI EVOLUTION OF STRUCTURE IN A QUIESCENT ELECTRORHEOLOGICAL FLUID SO PHYSICAL REVIEW LETTERS LA English DT Article AB We report a real-time, two-dimensional light scattering study of the evolution of structure in a concentrated electrorheological fluid during the "liquid-solid" phase transition. We find that after particle chaining along the electric field lines, strong light scattering lobes appear at a finite scattering wave vector q orthogonal to the field lines, and then brighten as they move to q=0. This indicates the existence of an unstable concentration fluctuation that signifies the segregation of chains into columns. We suggest a theoretical explanation for our results. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. RP MARTIN, JE (reprint author), SANDIA NATL LABS,DIV ADV MAT PHYS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 129 Z9 130 U1 0 U2 11 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 SEP 7 PY 1992 VL 69 IS 10 BP 1524 EP 1527 DI 10.1103/PhysRevLett.69.1524 PG 4 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000013 ER PT J AU NARASIMHAN, S VANDERBILT, D AF NARASIMHAN, S VANDERBILT, D TI ELASTIC STRESS DOMAINS AND THE HERRINGBONE RECONSTRUCTION ON AU(111) SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; SURFACE; DISLOCATIONS; MODEL AB We suggest that the herringbone reconstruction of the Au(111) surface results from the spontaneous formation of "stress domains." The surface is described theoretically by a 2D Frenkel-Kontorova model. Upon including long-range elastic interactions, the stress-domain pattern is energetically favored. The surface topography and structure factor obtained by relaxing atomic coordinates using molecular dynamics bear a strong resemblance to scanning tunneling microscopy pictures and x-ray scattering data, respectively. Our numerical estimate for the separation between domain walls is consistent with experimental results. C1 RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. RP NARASIMHAN, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS 510A,UPTON,NY 11973, USA. OI Vanderbilt, David/0000-0002-2465-9091 NR 19 TC 213 Z9 213 U1 4 U2 65 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 SEP 7 PY 1992 VL 69 IS 10 BP 1564 EP 1567 DI 10.1103/PhysRevLett.69.1564 PG 4 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000023 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI SYSTEMATICS OF ADSORPTION NEAR A STEP SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE; ADATOM AB Local-density-functional (LDF) calculations show that on Al(331), a surface whose narrow (111)-like terraces are separated by (110)-like steps, a trivalent Al adatom is strongly attracted to step bottoms, while a monovalent H adatom prefers step edges. H-adatom potential energies in the threefold terrace sites on Al(331) and Al(111) differ by only about 0.1 eV. This is because H atoms are small and must sit close to substrate atoms, where step effects are rapidly screened. Al adatoms, being larger, prefer the terrace sites of Al(331) by more than 0.25 eV. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 34 Z9 34 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 SEP 7 PY 1992 VL 69 IS 10 BP 1568 EP 1571 DI 10.1103/PhysRevLett.69.1568 PG 4 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000024 ER PT J AU WELP, U FLESHLER, S KWOK, WK KLEMM, RA VINOKUR, VM DOWNEY, J VEAL, B CRABTREE, GW AF WELP, U FLESHLER, S KWOK, WK KLEMM, RA VINOKUR, VM DOWNEY, J VEAL, B CRABTREE, GW TI HIGH-FIELD SCALING BEHAVIOR OF THERMODYNAMIC AND TRANSPORT QUANTITIES OF YBA2CU3O7-DELTA NEAR THE SUPERCONDUCTING TRANSITION - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID FLUCTUATIONS; HEAT; HC2; TC RP WELP, U (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 13 TC 6 Z9 6 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 SEP 7 PY 1992 VL 69 IS 10 BP 1623 EP 1623 DI 10.1103/PhysRevLett.69.1623 PG 1 WC Physics, Multidisciplinary SC Physics GA JL610 UT WOS:A1992JL61000040 ER PT J AU BRIZARD, A AF BRIZARD, A TI HERMITIAN STRUCTURE FOR LINEARIZED IDEAL MHD EQUATIONS WITH EQUILIBRIUM FLOWS SO PHYSICS LETTERS A LA English DT Article ID MAXWELL-VLASOV EQUATIONS; HAMILTONIAN-STRUCTURE; VARIATIONAL STRUCTURE; FORMULATION; STABILITY; SYSTEMS; PLASMAS; WAVES AB The linearized ideal magnetohydrodynamic (MHD) equations with equilibrium flows do not possess a standard Hermitian structure. This linearized system has a canonical Hamiltonian structure, however, and is shown to possess a non-standard Hermitian structure with respect to an indefinite inner product. RP BRIZARD, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. OI Brizard, Alain/0000-0002-0192-6273 NR 30 TC 11 Z9 11 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 SEP 7 PY 1992 VL 168 IS 5-6 BP 357 EP 362 DI 10.1016/0375-9601(92)90518-Q PG 6 WC Physics, Multidisciplinary SC Physics GA JM257 UT WOS:A1992JM25700005 ER PT J AU JUDSON, RS COLVIN, ME MEZA, JC HUFFER, A GUTIERREZ, D AF JUDSON, RS COLVIN, ME MEZA, JC HUFFER, A GUTIERREZ, D TI DO INTELLIGENT CONFIGURATION SEARCH TECHNIQUES OUTPERFORM RANDOM SEARCH FOR LARGE MOLECULES SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article; Proceedings Paper CT 3RD PRESIDENTS MEETING OF THE INTERNATIONAL SOC OF QUANTUM BIOLOGY AND PHARMACOLOGY CY SEP 04-07, 1991 CL STANFORD UNIV, PALO ALTO, CA SP INT SOC QUANTUM BIOL & PHARM, ARRIS PHARM, BERLEX LABS, BIOSYM TECHNOL, MARRION MERRELL DOW RES INST, MERCK SHARP & DOHME RES LABS, PFIZER, POLYGEN, SMITHKLINE BEECHAM PHARM, SYNTEX RES HO STANFORD UNIV ID OPTIMIZATION AB We compare three global configuration search methods on a scalable model problem to measure relative performance over a range of molecule sizes. Our model problem is a 2-D polymer composed of atoms connected by rigid rods in which all pairs of atoms interact via Lennard-Jones potentials. The global minimum energy can be calculated analytically. The search methods are all hybrids combining a global sampling algorithm with a local refinement technique. The sampling methods are simulated annealing (SA), genetic algorithms (GA), and random search. Each of these uses a conjugate gradient (CG) routine to perform the local refinement. Both GA and SA perform progressively better relative to random search as the molecule size increases. We also test two other local refinement techniques in addition to CG, coupled to random search as the global method. These are simplex followed by CG and simplex followed by block-truncated Newton. For small problems, the addition of the intermediate simplex step improved the performance of the overall hybrid method. RP JUDSON, RS (reprint author), SANDIA NATL LABS,CTR COMPUTAT ENGN,LIVERMORE,CA 94551, USA. RI Meza, Juan/B-5601-2012 NR 15 TC 49 Z9 49 U1 0 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD SEP 5 PY 1992 VL 44 IS 2 BP 277 EP 290 DI 10.1002/qua.560440214 PG 14 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA JJ859 UT WOS:A1992JJ85900012 ER PT J AU LIN, JJ PHILLIPS, AM HEARST, JE SANCAR, A AF LIN, JJ PHILLIPS, AM HEARST, JE SANCAR, A TI ACTIVE-SITE OF (A)BC EXCINUCLEASE .2. BINDING, BENDING, AND CATALYSIS MUTANTS OF UVRB REVEAL A DIRECT ROLE IN 3' AND AN INDIRECT ROLE IN 5' INCISION SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID NUCLEOTIDE EXCISION REPAIR; ESCHERICHIA-COLI UVRAB; ENZYMATIC-PROPERTIES; PROTEIN COMPLEX; DUPLEX DNA; GENE; SEQUENCE; STRAND; ADDUCT; ENDONUCLEASE AB UvrB plays a central role in (A)BC excinuclease. To study its role in the incision reactions, conserved His and Asp residues in this subunit were mutagenized. All His and the majority of Asp mutants behaved like wild-type protein in vivo and in vitro. However, three mutants, D337A, D478A, and D510A, either completely or partially abolished UvrB activity. All three mutant proteins associate with UvrA normally but D337A and D510A were unable to bind to DNA specifically. The UvrB-D478A mutant bound to DNA specifically but failed to denature and kink the DNA. However, UvrB-D478A was efficiently loaded onto DNA preincised at the 3' site and promoted near- normal incision by UvrC at the 5' site. We propose that D478 is involved in bending DNA and catalysis of the 3' incision and that the 3' incision precedes the 5' incision. UvrB* which is missing the carboxyl-terminal 43 amino acids binds to, and kinks DNA but is unable to make the 3' incision suggesting that it is missing a residue involved in catalysis. This residue was identified to be E639 by site-specific mutagenesis. C1 LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. RP LIN, JJ (reprint author), UNIV N CAROLINA,SCH MED,DEPT BIOCHEM & BIOPHYS,CHAPEL HILL,NC 27599, USA. RI Lin, Jing-Jer/G-8068-2015 FU NIGMS NIH HHS [GM32833] NR 43 TC 92 Z9 92 U1 2 U2 4 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 5 PY 1992 VL 267 IS 25 BP 17693 EP 17700 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JM223 UT WOS:A1992JM22300035 PM 1387640 ER PT J AU KRESIN, VZ LESTER, WA AF KRESIN, VZ LESTER, WA TI A QUANTUM-MECHANICAL MODEL OF HETEROGENEOUS CATALYSIS SO CHEMICAL PHYSICS LETTERS LA English DT Article AB A quantum-mechanical model for heterogeneous catalytic reactions is developed based on the reaction Hamiltonian method developed by the authors. It is shown that the presence of the surface leads to additional channels of reaction. These are found to dominate the exponential smallness of the reaction probability of the direct channel producing large reaction probabilities for surface-catalyzed reactions. The dependence of catalytic reaction probability on reactant dissociation energy and vibrational frequencies, and the leakage of the electronic wavefunction out of the surface is discussed. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 14 TC 2 Z9 2 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 SEP 4 PY 1992 VL 197 IS 1-2 BP 1 EP 6 DI 10.1016/0009-2614(92)86011-6 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL855 UT WOS:A1992JL85500001 ER PT J AU GRAY, SK AF GRAY, SK TI QUANTUM DYNAMICS OF ARI2-]AR+I2 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID VANDERWAALS MOLECULES; VIBRATIONAL PREDISSOCIATION; WAVE PACKET; FRAGMENTATION; ENERGY; DISSOCIATION; COMPLEXES; IODINE; ARCL2; NECL2 AB Wavepacket calculations are reported for vibrational predissociation on a model potential surface for ArI2(B). Initial I2 vibrational excitations upsilon' = 18 and 21 are examined and the results compared with experiment. Closely spaced resonances are found to influence the theoretical dynamics. RP GRAY, SK (reprint author), ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439, USA. NR 24 TC 51 Z9 51 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 4 PY 1992 VL 197 IS 1-2 BP 86 EP 91 DI 10.1016/0009-2614(92)86027-F PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL855 UT WOS:A1992JL85500017 ER PT J AU OHTANI, S ELPHIC, RC RUSSELL, CT KOKUBUN, S AF OHTANI, S ELPHIC, RC RUSSELL, CT KOKUBUN, S TI ISEE-1 AND ISEE-2 OBSERVATIONS OF AN ISOLATED DIAMAGNETIC EVENT - AN EARTHWARD-MOVING PLASMA BULGE OR A TAIL-ALIGNED FLUX ROPE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SHEET; MAGNETOTAIL AB This paper reports a transient strong diamagnetic event observed with the ISEE-1 and -2 spacecraft in the near-Earth magnetotail. Magnetic signatures associated with the event resemble those of flux rope events found in the distant magnetotail. The present event should be distinguished from those in several previous reports based on the following points: (1) The event is observed in the near-Earth tail (X approximately -17 R(E), not in the distant tail. (2) The tail field changes from a stressed configuration to a more dipolar one in the course of the event, and the plasma data suggest that the heating and the resultant expansion of the plasma take place simultaneously. (3) The minimum of the magnetic field strength B(T) is approximately 1 nT; such a strong depression is rarely observed in the near-Earth tail. (4) An earthward plasma jet (300 to 500 km/s) continues for about 3 min, including a period of very weak magnetic field; the duration of the jet is exceptionally long compared to previously reported high-speed flows in the plasma sheet. These magnetic field and plasma signatures are discussed in terms of two models: an earthward-moving plasma bulge and a tail-aligned flux rope. C1 UNIV TOKYO,DEPT EARTH & PLANETARY PHYS,TOKYO 113,JAPAN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. RP OHTANI, S (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20707, USA. RI Ohtani, Shinichi/E-3914-2016; OI Ohtani, Shinichi/0000-0002-9565-6840; Russell, Christopher/0000-0003-1639-8298 NR 12 TC 5 Z9 5 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 SEP 4 PY 1992 VL 19 IS 17 BP 1743 EP 1746 DI 10.1029/92GL01805 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JP126 UT WOS:A1992JP12600006 ER PT J AU MULHOLLAND, PJ DRISCOLL, CT ELWOOD, JW OSGOOD, MP PALUMBO, AV ROSEMOND, AD SMITH, ME SCHOFIELD, C AF MULHOLLAND, PJ DRISCOLL, CT ELWOOD, JW OSGOOD, MP PALUMBO, AV ROSEMOND, AD SMITH, ME SCHOFIELD, C TI RELATIONSHIPS BETWEEN STREAM ACIDITY AND BACTERIA, MACROINVERTEBRATES, AND FISH - A COMPARISON OF NORTH TEMPERATE AND SOUTH TEMPERATE MOUNTAIN STREAMS, USA SO HYDROBIOLOGIA LA English DT Article DE STREAM ACIDIFICATION; ALUMINUM; BACTERIA; MACROINVERTEBRATES; FISH; LEAF DECOMPOSITION ID TERM EXPERIMENTAL ACIDIFICATION; ORGANIC-MATTER; BENTHIC INVERTEBRATES; CIRCUMNEUTRAL STREAMS; COMMUNITY STRUCTURE; HYDROGEN-IONS; WELSH STREAM; LOW PH; ALUMINUM; LAKE AB A comparative study of relationships between stream acidity and bacteria, macroinvertebrates, and fish in the Adirondack Mountains of upper New York state and in the Southern Blue Ridge Mountains of eastern Tennessee, USA, was conducted. Although the study sites in both regions spanned a pH range from approximately 4.5 to 6.4, considerably greater seasonal variability in pH and higher monomeric Al concentrations characterized the Adirondack sites. Relationships between several biological characteristics and stream water acidity were similar in both regions, including lower production of epilithic bacteria and bacteria on decomposing leaves, lower leaf decomposition rates, lower density and generic richness of scraper/grazer macroinvertebrates, particularly Ephemeroptera, and lower fish abundance and survival in more acidic streams. Densities of total macroinvertebrates and densities of macroinvertebrates and bacteria inhabiting or closely associated with stream sediments were generally not related to stream water acidity. Regional differences occur in some of the relationships between biological characteristics and stream water acidity. Negative correlations between bacterial production on rocks and pH, between bacterial production on decomposing leaves and pH, and between densities of Ephemeroptera and scrapers and pH were stronger in the Adirondacks than in the Southern Blue Ridge. Higher Al concentrations in the Adirondacks may be responsible for the stronger relationships with pH there. The steeper slopes of the relationships between Ephemeroptera density and all forms of Al in the Adirondacks compared with the Southern Blue Ridge suggests that there may be some adaptation among a few acid/aluminum-tolerant species in the seasonally more constant acidic Southern Blue Ridge streams. Fish bioassays indicated longer survival times in acidic streams in the Adirondacks compared with the Southern Blue Ridge, but these results may be an artifact associated with the use in the Southern Blue Ridge of rainbow trout as the test species which is known to be more acid sensitive compared with brook trout, the test species used in the Adirondacks. C1 SYRACUSE UNIV,DEPT CIVIL ENGN,SYRACUSE,NY 13244. CLARKSON UNIV,DEPT BIOL,POTSDAM,NY 13699. VANDERBILT UNIV,DEPT GEN BIOL,NASHVILLE,TN 37240. VALDOSTA STATE COLL,DEPT BIOL,VALDOSTA,GA 31698. CORNELL UNIV,DEPT NAT RESOURCES,ITHACA,NY 14850. RP MULHOLLAND, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Palumbo, Anthony/A-4764-2011; Mulholland, Patrick/C-3142-2012; Driscoll, Charles/F-9832-2014; OI Palumbo, Anthony/0000-0002-1102-3975; Driscoll, Charles/0000-0003-2692-2890 NR 52 TC 28 Z9 30 U1 3 U2 17 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0018-8158 J9 HYDROBIOLOGIA JI Hydrobiologia PD SEP 4 PY 1992 VL 239 IS 1 BP 7 EP 24 DI 10.1007/BF00027525 PG 18 WC Marine & Freshwater Biology SC Marine & Freshwater Biology GA JN348 UT WOS:A1992JN34800002 ER PT J AU VANDENENGH, G SACHS, R TRASK, BJ AF VANDENENGH, G SACHS, R TRASK, BJ TI ESTIMATING GENOMIC DISTANCE FROM DNA-SEQUENCE LOCATION IN CELL-NUCLEI BY A RANDOM-WALK MODEL SO SCIENCE LA English DT Article ID HUNTINGTON DISEASE GENE; INSITU HYBRIDIZATION; COSMID CLONES; INTERPHASE; RESOLUTION; SERIATION; REGION AB The folding of chromatin in interphase cell nuclei was studied by fluorescent in situ hybridization with pairs of unique DNA sequence probes. The sites of DNA sequences separated by 100 to 2000 kilobase pairs (kbp) are distributed in interphase chromatin according to a random walk model. This model provides the basis for calculating the spacing of sequences along the linear DNA molecule from interphase distance measurements. An interphase mapping strategy based on this model was tested with 13 probes from a 4-megabase pair (Mbp) region of chromosome 4 containing the Huntington disease locus. The results confirmed the locations of the probes and showed that the remaining gap in the published maps of this region is negligible in size. Interphase distance measurements should facilitate construction of chromosome maps with an average marker density of one per 100 kbp, approximately ten times greater than that achieved by hybridization to metaphase chromosomes. C1 UNIV WASHINGTON,SCH MED,DEPT MOLEC BIOTECHNOL GJ-10,SEATTLE,WA 98195. UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,CTR HUMAN GENOME,LIVERMORE,CA 94550. FU NHGRI NIH HHS [HG00256] NR 20 TC 205 Z9 207 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 SEP 4 PY 1992 VL 257 IS 5075 BP 1410 EP 1412 DI 10.1126/science.1388286 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JL612 UT WOS:A1992JL61200037 PM 1388286 ER PT J AU SODERHOLM, L WURZ, P LYKKE, KR PARKER, DH LYTLE, FW AF SODERHOLM, L WURZ, P LYKKE, KR PARKER, DH LYTLE, FW TI AN EXAFS STUDY OF THE METALLOFULLERENE YC82 - IS THE YTTRIUM INSIDE THE CAGE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ABSORPTION FINE-STRUCTURE; EXTENDED X-RAY; CRYSTAL-STRUCTURE; COMPLEXES; C60; FULLERENES AB A sample, determined by time-of-flight mass spectroscopy (TOFMS) to consist of YC82 as the major metal-fullerene complex, was analyzed by X-ray absorption spectroscopy. The Y is found to have 7 +/- 1 near-neighbor C atoms at 2.35 +/- 0.02 angstrom and an Y neighbor at 4.05 +/- 0.05 angstrom. The unequivocal observation of an Y-Y interaction is unexpected, since the mass spectral data show no indication of Y2Cn as a major component of the sample. We believe that the combined TOFMS and extended X-ray absorption fine structure (EXAFS) results are not consistent with models that place the metal ion inside the fullerene cage. Instead, we propose that our data can be explained with a dimer of the form C82Y-X-YC82, where -X-is a bridging carbon or oxygen species. The short Y-C near-neighbor distance indicates a strong, bonding interaction between the metal ion and the fullerene cage. C1 BOEING CO,SEATTLE,WA 98124. UNIV CALIF IRVINE,INST SURFACE & INTERFACE SCI,IRVINE,CA 92717. RP SODERHOLM, L (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 23 TC 48 Z9 48 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 3 PY 1992 VL 96 IS 18 BP 7153 EP 7156 DI 10.1021/j100197a003 PG 4 WC Chemistry, Physical SC Chemistry GA JM586 UT WOS:A1992JM58600003 ER PT J AU FERRIERI, RA WOLF, AP AF FERRIERI, RA WOLF, AP TI GAS-PHASE REACTIONS INVOLVING HOT O-18(3P) ATOMS AND FORMALDEHYDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ABSOLUTE RATE PARAMETERS; OZONE-ALKENE REACTIONS; STOPPED-FLOW; MECHANISMS; ETHYLENE; O(P-3); H2CO AB We report an investigation of the low-pressure gas-phase reactions involving hot (O(3P))-O-18 atoms with translational energies in excess of 1 eV and formaldehyde. Using mass spectrometry, O-18 incorporation in (COO)-O-16-O-18 and (HCO)-O-18 products was observed. These results strongly suggested that carbonyl bond addition was an important reaction at these energies. RP FERRIERI, RA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 23 TC 6 Z9 6 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 3 PY 1992 VL 96 IS 18 BP 7164 EP 7166 DI 10.1021/j100197a007 PG 3 WC Chemistry, Physical SC Chemistry GA JM586 UT WOS:A1992JM58600007 ER PT J AU WALTERS, EA GROVER, JR CLAY, JT CIDAGUERO, P WILLCOX, MV AF WALTERS, EA GROVER, JR CLAY, JT CIDAGUERO, P WILLCOX, MV TI CLUSTER BEAM ANALYSIS VIA PHOTOIONIZATION - THIOPHENE SEEDED IN HELIUM AND ARGON AND BROMOTRIFLUOROMETHANE PLUS METHANOL SEEDED IN ARGON SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID FLUORESCENCE EXCITATION SPECTRUM; RESONANT 2-PHOTON IONIZATION; HYDROGEN-BONDED DIMERS; VANDERWAALS COMPLEXES; SCATTERING ANALYSIS; ELECTRONIC SPECTROSCOPY; DISSOCIATION-ENERGIES; MASS SPECTROMETERS; AROMATIC-MOLECULES; PHOTO-IONIZATION AB A photoionization mass spectrometric method for quantitative analysis of neutral clusters in free-jet expansions is applied to the binary system of thiophene in helium or argon and to the ternary mixture of bromotrifluoromethane and methanol in argon. The distributions of thiophene homodimers and homotrimers are markedly different when expanded in He as opposed to Ar using C4H4S:He,Ar = 1:9 mixtures. The homodimer maximum in He occurs at 475 Torr, whereas it is located at 200 Torr in Ar. The differences can be understood qualitatively in terms of dynamically determined removal rates of heat of condensation in the two carrier gases. Efficient cooling in Ar allows preparation of homo- and heteroclusters in Ar:CF3Br:CH3OH = 293:28:1 mixtures. This system is used to demonstrate extension of the analysis method to a ternary system. Cluster distributions are determined for (CF3Br)2, (CH3OH)2, (CH3OH)3, CF3Br-CH30H, (CF3Br)2CH3OH, and CF3Br(CH3OH)2. C1 UNIV NEW MEXICO, NEW MEXICO ENGN RES INST, CTR GLOBAL ENVIRONM TECHNOL, ALBUQUERQUE, NM 87131 USA. BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. RP WALTERS, EA (reprint author), UNIV NEW MEXICO, DEPT CHEM, ALBUQUERQUE, NM 87131 USA. NR 60 TC 8 Z9 8 U1 0 U2 0 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 SEP 3 PY 1992 VL 96 IS 18 BP 7236 EP 7243 DI 10.1021/j100197a020 PG 8 WC Chemistry, Physical SC Chemistry GA JM586 UT WOS:A1992JM58600020 ER PT J AU HOLROYD, RA SHAM, TK YANG, BX FENG, XH AF HOLROYD, RA SHAM, TK YANG, BX FENG, XH TI FREE ION YIELDS IN LIQUIDS EXPOSED TO SYNCHROTRON X-RAYS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID K-EDGE AB A synchrotron light source was utilized to measure the yields of ions for exposure of nonpolar liquids to monochromatic X-rays as a function of energy (1.8-4.0 keV). For n-hexane, 2,2,4-trimethylpentane, and 2,2,4,4-tetramethylpentane, the yields per 100 eV (G values) decreases monotonically with decreasing photon energy, that is, as the rate of energy loss of the photoelectron increases. The yields increase with an increase in the applied electric field. The results are consistent with a track model. For liquid CCl4, sharp resonances are observed at energies just below the K edge of chlorine. These are "negative" peaks, that is, dips in the ion yield associated with excitation of a 1s electron in chlorine to unoccupied orbitals. C1 UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,CANADIAN SYNCHROTRON RADIAT FACIL,MADISON,WI 53589. RP HOLROYD, RA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 10 TC 12 Z9 12 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 SEP 3 PY 1992 VL 96 IS 18 BP 7438 EP 7441 DI 10.1021/j100197a056 PG 4 WC Chemistry, Physical SC Chemistry GA JM586 UT WOS:A1992JM58600056 ER PT J AU MATHEWS, GJ AF MATHEWS, GJ TI NUCLEOSYNTHESIS - FLASHING GIANTS FORGE FLUORINE SO NATURE LA English DT Editorial Material RP MATHEWS, GJ (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD SEP 3 PY 1992 VL 359 IS 6390 BP 18 EP 19 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JL662 UT WOS:A1992JL66200028 ER PT J AU MATHEWS, GJ AF MATHEWS, GJ TI ASYMPTOTIC-GIANT-BRANCH STARS SO NATURE LA English DT Editorial Material RP MATHEWS, GJ (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD SEP 3 PY 1992 VL 359 IS 6390 BP 18 EP 18 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JL662 UT WOS:A1992JL66200029 ER PT J AU SORGE, H BERENGUER, M STOCKER, H GREINER, W AF SORGE, H BERENGUER, M STOCKER, H GREINER, W TI COLOR ROPE FORMATION AND STRANGE BARYON PRODUCTION IN ULTRARELATIVISTIC HEAVY-ION COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID QUARK-GLUON PLASMA; FLUX-TUBE MODEL; SULFUR-TUNGSTEN INTERACTIONS; PARTICLE-PRODUCTION; NUCLEAR COLLISIONS; LAMBDA-PRODUCTION; STRING DYNAMICS; 200 GEV/C; FRAGMENTATION; ENERGY AB Enhanced strangeness production in recent experiments with S projectiles on different targets at a beam energy of 200 A GeV has been reported by several experimental groups (NA35, WA85, NA34). Here we consider that elementary triplet colour charges which are excited in the initial stage of a nucleus-nucleus collision may combine forming highly charged "ropes". The colour ropes decay by quark-antiquark pair creation screening the initial field. We implemented the generation and decay of ropes into a new version of the Monte Carlo program RQMD which is based on string excitation in ultrarelativistic nucleus-nucleus collisions. We find that all measured strange particle yields in S+S can be quantitatively understood employing the rope mechanism in addition to hadronic rescattering. C1 UNIV FRANKFURT,W-6000 FRANKFURT,GERMANY. RP SORGE, H (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 41 TC 117 Z9 117 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 SEP 3 PY 1992 VL 289 IS 1-2 BP 6 EP 11 DI 10.1016/0370-2693(92)91353-B PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JL827 UT WOS:A1992JL82700002 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELOUS, K BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIRIO, R 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 DALMANGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C DELASO, MDM 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 DZHELYADIN, R EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B 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 HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, C HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J 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 LEVY, JM LIEB, E LIKO, D LILLETHUN, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O 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 RONJIN, V RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A TORASSA, E TORTORA, L TRAINOR, MT 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 VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P VISHNEVSKY, N 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 WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELOUS, K BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIRIO, R 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 DALMANGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C DELASO, MDM 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 DZHELYADIN, R EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B 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 HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, C HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J 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 LEVY, JM LIEB, E LIKO, D LILLETHUN, E 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 NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O 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 RONJIN, V RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A TORASSA, E TORTORA, L TRAINOR, MT 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 VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P VISHNEVSKY, N 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 WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI EVIDENCE FOR B(S)(0) MESON PRODUCTION IN Z(0) DECAYS SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; Z0 DECAYS; COLLIDER AB Seven unambiguous events out of a sample of 270 000 Z0 decays, contain in tile same jet a D(s) meson and a muon at large transverse momentum relative to the et axis. These events are direct evidence for B(s)0 meson production in hadronic Z0 decays. The production rate of these events, relative to all hadronic Z0 decays is ( 18 +/- 8) x 10(-5) this number including the relevant branching fractions of the B(s)0 and D(s). The value of the B(s)0 meson lifetime relative to the average B meson lifetime is measured to be 0.8 +/- 0.4. C1 AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. JOINT INST NUCL RES,MOSCOW 101000,USSR. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV PARIS 07,F-75230 PARIS 05,FRANCE. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO DE JANEIRO,BRAZIL. INST HIGH ENERGY PHYS,PROTVINO,USSR. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. INST JOZEF STEFAN,LJUBLJANA,YUGOSLAVIA. INST NUCL PHYS,HIGH ENERGY PHYS,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO DE JANEIRO,BRAZIL. IFIC,VALENCIA,SPAIN. UNIV VALENCIA,CSIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAM,E-46100 BURJASSOT,SPAIN. INFN,I-20133 MILAN,ITALY. UNIV LYON 1,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,F-91405 ORSAY,FRANCE. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. UNIV LOUIS PASTEUR,INST NATL PHYS NUCL & PHYS PARTICLES,CTR RECH NUCL,CNRS,F-67037 STRASBOURG,FRANCE. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VRIJE UNIV BRUSSELS,UNIV LIBRE BRUXELLES,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CENS,DPHDE,F-91191 GIF SUR YVETTE,FRANCE. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. RP ABREU, P (reprint author), INST SUPER TECN,FOUL,LIP,AV ELIAS GARCIA 14,P-1000 LISBON,PORTUGAL. RI Botner, Olga/A-9110-2013; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; 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; Barao, Fernando/O-2357-2016; 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; Zuniga, Juan/P-4385-2014; OI Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Dracos, Marcos/0000-0003-0514-193X; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; 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; Barao, Fernando/0000-0002-8346-9941; 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; Zuniga, Juan/0000-0002-1041-6451; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 28 TC 37 Z9 37 U1 0 U2 12 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 SEP 3 PY 1992 VL 289 IS 1-2 BP 199 EP 210 DI 10.1016/0370-2693(92)91385-M PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JL827 UT WOS:A1992JL82700034 ER PT J AU BURNS, CJ SMITH, DC SATTELBERGER, AP GRAY, HB AF BURNS, CJ SMITH, DC SATTELBERGER, AP GRAY, HB TI MONOMERIC URANYL ALKOXIDE AND AMIDE COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID ELECTRONIC-STRUCTURE; CHEMISTRY; ION AB Reaction of UO2Cl2(Ph3PO)2 with 2 equiv of KO-t-Bu or NaN(SiMe3)2 in THF results in the formation of UO2(O-t-Bu)2(Ph3PO)2 (1) or UO2[N(SiMe3)2]2(Ph3PO)2 (2); the yields are 84 (1) and 77% (2). The infrared spectra of these compounds exhibit strong U-O stretching bands at 861 (1) and 901 (2) cm-1; these features shift to 822 and 854 cm-1, respectively, upon O-18 substitution. The solid-state structure of 1 reveals that the alkoxide and phosphine oxide ligands are arranged in a cis geometry in the equatorial plane of the uranyl ion (U-O(1)(oxo) = 1.789 (5) angstrom, U-O(2)(oxo) = 1.795 (6) angstrom, O(1)-U-O(2) = 174.8 (2)-degrees). NMR spectroscopy shows that both cis and trans isomers exist for 1 and 2. Exchange with free phosphine and equilibration of the isomers occur at 80-degrees-C for 1 and 55-degrees-C for 2. 1 and 2 luminesce (1, lambda(max) 571 nm; 2, lambda(max) 555 nm); the 77 K excitation and emission spectra of 1 are highly structured, with the dominant vibronic progression assigned to the symmetric O-U-O stretch (excitation, 643 +/- 16 cm-1, with O-18 substitution 606 +/- 10 cm-1; emission, 770 +/-20 cm-1, with O-18 substitution 737 +/- 7 cm-1). C1 CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,PASADENA,CA 91125. RP BURNS, CJ (reprint author), LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,INORGAN & STRUCT CHEM GRP INC-1,LOS ALAMOS,NM 87545, USA. NR 42 TC 37 Z9 37 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 2 PY 1992 VL 31 IS 18 BP 3724 EP 3727 DI 10.1021/ic00044a013 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JL788 UT WOS:A1992JL78800013 ER PT J AU TOUPADAKIS, A KUBAS, GJ BURNS, CJ AF TOUPADAKIS, A KUBAS, GJ BURNS, CJ TI DISPROPORTIONATION OF SO2 TO S8 AND SO3 ON CP-ASTERISK-2CR2S5 - CRYSTALLOGRAPHIC AND S-34-LABELING EVIDENCE FOR AN OXYGEN-TRANSFER MECHANISM AND OBSERVATION OF FACILE EXCHANGE OF CR2S5 CORE SULFURS WITH S-34 - STRUCTURES OF CP-ASTERISK-2CR2(MU-S)(MU-ETA-2-S2)(MU-ETA-1-SS.SO2).SO2 AND CP-ASTERISK-2CR2(MU-S)(MU-ETA-2-S2)(MU-SSO3) SO INORGANIC CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE; REACTIVITY; COMPLEXES; CATALYSIS; SPECTRUM; LIGAND AB The syntheses, structures, and reactivities of Cp*2Cr2(mu-S)(mu-S2)(mu-SS.SO2).SO2, 1.2SO2, and CP*2Cr2(mu-S)(mu-S2)(mu-SSO3).(CD3OD)lattice, 2, are reported. Reversible addition of SO2 to Cp*2Cr2S5, 1, to give 1.2SO2 was found to occur at room temperature. 1 possesses a novel mu-eta-1-S2 ligand, and X-ray crystallography of 1.2SO2 showed that SO2 binds as a Lewis acid to the terminal sulfur of this ligand with an acute S-S-S angle (94-degrees). The S-SO2 distance of 2.41 angstrom is about 0.2 angstrom shorter than in the previously known Cp*2Mo2(mu-S)(mu-S2)(mu-S.SO2). Consistent with this greater activation, 1.2SO2 further reacts in the presence of excess SO2 to give the thiosulfate 2 (isomorphous to the Mo analogue) at a much faster rate than in the Mo system. Significantly, the crystal structure of 1.2SO2 shows the presence of associated SO2 molecules unsymmetrically bridging (via sulfur) the oxygen atoms of each sulfide-bound SO2 molecule to give a cyclic aggregate of four SO2 molecules (intermolecular S...O distances of 2.78 and 2.95 angstrom). Infrared studies demonstrate that these interactions further activate (weaken) the S=O bonds of the sulfide-bound SO2. Thus, it is proposed that the mechanism of SO2 disproportionation in solution involves base-assisted oxygen atom transfer from the sulfide-bound SO2 molecule to the associated SO2 to produce SO3. The SO3 then displaces S2O (which decomposes to S8 and SO2) from the bridging sulfide ligand to give the observed thiosulfate product. The reactivities of 1.2SO2 and Cp*2Cr2S4.SO2 vs Cp*2Mo2S4.SO2 and of 2 vs Cp*2Mo2S4.SO3 are discussed. A mechanism for the oxygen atom transfer reaction is proposed on the basis of the crystal structure of 1.2SO2 and S-34-labeling studies. Facile reaction of Cp*2Cr2S4 with S8 was found to give 1, and all five of the core sulfurs in the latter incorporated S-34 if excess S-34(8) was used. 1.2SO2 and 2 crystallize in the space groups C2/c and P1BAR, respectively. The cell dimensions are the following: 1.2SO2, a = 16.087 (4) angstrom, b = 15.926 (3) angstrom, c = 21.650 (3) angstrom, beta = 105.29 (2)-degrees, and Z = 8; 2, a = 10.336 (2) angstrom, b = 10.891 (2) angstrom, c = 13.219 (3) angstrom, alpha = 85.15 (3)-degrees, beta = 78.85 (3)-degrees, gamma = 62.39 (3)-degrees, and Z = 2. R = 4.85% for 1.2SO2, and R = 4.84% for 2. C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC-1,MS-C346,LOS ALAMOS,NM 87545. NR 30 TC 22 Z9 22 U1 3 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 2 PY 1992 VL 31 IS 18 BP 3810 EP 3817 DI 10.1021/ic00044a025 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JL788 UT WOS:A1992JL78800025 ER PT J AU SCHMIDT, SC MOORE, DS AF SCHMIDT, SC MOORE, DS TI VIBRATIONAL SPECTROSCOPY OF HIGH-TEMPERATURE, DENSE MOLECULAR FLUIDS BY COHERENT ANTI-STOKES-RAMAN SCATTERING SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID LIQUID-NITROGEN; ENERGY RELAXATION; PHASE-TRANSITION; CARBON-MONOXIDE; HIGH-DENSITIES; MIXTURES; CARS; N-2; THERMODYNAMICS; POTENTIALS RP SCHMIDT, SC (reprint author), LOS ALAMOS NATL LAB,SHOCK WAVE PHYS GRP,LOS ALAMOS,NM 87545, USA. RI Moore, David/C-8692-2013 NR 52 TC 22 Z9 22 U1 0 U2 6 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 SEP PY 1992 VL 25 IS 9 BP 427 EP 432 DI 10.1021/ar00021a008 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA JN426 UT WOS:A1992JN42600008 ER PT J AU MARKOWITZ, VM SHOSHANI, A AF MARKOWITZ, VM SHOSHANI, A TI REPRESENTING EXTENDED ENTITY-RELATIONSHIP STRUCTURES IN RELATIONAL DATABASES - A MODULAR APPROACH SO ACM TRANSACTIONS ON DATABASE SYSTEMS LA English DT Article DE ALGORITHMS, DESIGN; DATABASE DESIGN; EXTENDED ENTITY-RELATIONSHIP MODEL; RELATIONAL DATA MODEL; SCHEMA TRANSLATION; SEMANTIC DATA MODEL ID RELATIONSHIP DIAGRAMS; MODEL AB A common approach to database design is to describe the structures and constraints of the database application in terms of a semantic data model, and then represent the resulting schema using the data model of a commercial database management system. Often, in practice, Extended Entity-Relationship (EER) schemas are translated into equivalent relational schemas. This translation involves different aspects: representing the EER schema using relational constructs, assigning names to relational attributes, normalization, and merging relations. Considering these aspects together, as is usually done in the design methodologies proposed in the literature, is confusing and leads to inaccurate results. We propose to treat separately these aspects and split the translation into four stages (modules) corresponding to the four aspects mentioned above. We define criteria for both evaluating the correctness of and characterizing the relationship between alternative relational representations of EER schemas. C1 LAWRENCE BERKELEY LAB,DIV INFORMAT & COMP SCI,BERKELEY,CA 94720. NR 25 TC 32 Z9 32 U1 0 U2 2 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0362-5915 J9 ACM T DATABASE SYST JI ACM Trans. Database Syst. PD SEP PY 1992 VL 17 IS 3 BP 423 EP 464 DI 10.1145/132271.132273 PG 42 WC Computer Science, Information Systems; Computer Science, Software Engineering SC Computer Science GA LA157 UT WOS:A1992LA15700002 ER PT J AU WANG, ZL AF WANG, ZL TI DYNAMIC SIMULATIONS OF ENERGY-FILTERED INELASTIC ELECTRON-DIFFRACTION PATTERNS SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID SCATTERING AB The previously proposed inelastic scattering theory [Wang (1991). Acta Cryst. A47, 686-698] has been applied to simulate the diffraction patterns of phonon, plasmon-loss and atomic core-shell scattered electrons. The details of the calculation method and the program flow chart are described here. The calculated thermal diffuse scattering (TDS) patterns using full lattice dynamics agree well with the experimental observations for parallel- and convergent-beam-illumination cases. The results have shown that the Kikuchi pattern is mainly produced by phonon-scattered electrons and that the Einstein model is not a good thermal-vibration model, at least for molybdenum and silicon. Under strongly diffracting conditions, calculations for energy-filtered diffraction patterns of core ionization edges have shown that the elastic and inelastic scattering can no longer be considered as independent and that the angular distribution of the inelastically scattered electrons cannot be simply described by the Lorentzian function. All these dynamical effects can affect the compositional microanalysis in electron energy-loss spectroscopy (EELS). C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,BLDG 5500,MS 6376,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 33 TC 11 Z9 11 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD SEP 1 PY 1992 VL 48 BP 674 EP 688 DI 10.1107/S0108767392002897 PN 5 PG 15 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JN896 UT WOS:A1992JN89600004 ER PT J AU WENK, HR DOWNING, KH HU, MS OKEEFE, MA AF WENK, HR DOWNING, KH HU, MS OKEEFE, MA TI 3D STRUCTURE DETERMINATION FROM ELECTRON-MICROSCOPE IMAGES - ELECTRON CRYSTALLOGRAPHY OF STAUROLITE SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID RESOLUTION; CRYSTALS; MODEL AB Resolution of better than 2 angstrom has been obtained in many crystals by high-resolution electron microscopy. Although this resolution is sufficient to resolve interatomic spacings, structures are traditionally interpreted by comparing experimental images with contrast calculations. A drawback of this method is that images are 2D projections in which information is invariably obscured by overlap of atoms. 3D electron crystallography, developed by biophysicists to study proteins, has been used to investigate the crystal structure of staurolite. Amplitudes and phases of structure factors are obtained experimentally from high-resolution images (JEOL ARM 1000 at the National Center for Electron Microscopy at LBL), taken in different directions from thin regions where dynamic scattering is minimal. From images in five orientations (containing 59 independent reflections to a resolution of 1.38 angstrom), a 3D electron potential map is constructed which resolves clearly all cations (Al, Si, Fe, including those with partial occupancy) and all O atoms. This method has great potential in crystal structure determinations of small domains in heterogeneous crystals which are inaccessible to X-ray analysis. It is estimated that 3D structure determinations should be possible on regions only about ten unit cells wide and should resolve not only atom positions but also site occupancies. The method is also applicable to space-group determination. C1 LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP WENK, HR (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [GM-36884] NR 33 TC 26 Z9 27 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD SEP 1 PY 1992 VL 48 BP 700 EP 716 DI 10.1107/S0108767392000850 PN 5 PG 17 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JN896 UT WOS:A1992JN89600008 PM 1445681 ER PT J AU VANSICLEN, CD WOLFER, WG AF VANSICLEN, CD WOLFER, WG TI NONEQUILIBRIUM VACANCY ENTRAPMENT BY RAPID SOLIDIFICATION SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID FOKKER-PLANCK EQUATIONS; PATH-INTEGRAL SOLUTIONS; NUMERICAL EVALUATION; METAL DROPLETS; CRYSTALLIZATION; MELT AB A complete, self-consistent theory is presented of vacancy entrapment at a rapidly advancing solidification front. This consists of heat conduction equations for the solid and liquid regions, a vacancy diffusion equation for the solid region, and boundary conditions at the liquid/solid interface expressed in the form of heat and vacancy fluxes. These dynamic fluxes, which connect the two phases and provide explicit coupling between enthalpy and vacancy concentration, describe the generation of the latent heat of fusion and the creation and annihilation of vacancies at the interface. This system of equations is specialized to the case of spherical, rapidly solidifying metal droplets, and solved by two methods. Firstly, solutions are given in the form of a set of integral equations that incorporate the boundary conditions as integral kernels. Temperature and vacancy concentration profiles calculated numerically show the existence of distinct, undercooling- and heat extraction-dominated solidification regimes, with large vacancy supersaturations achieved in the former case. Secondly, the system of equations is transformed into a set of algebraic and first-order ordinary differential equations by use of polynomial expressions for the profiles, and is solved to give the time evolution of the temperature and vacancy concentration at the moving interface. C1 SANDIA NATL LABS, LIVERMORE, CA 94550 USA. RP VANSICLEN, CD (reprint author), IDAHO NATL ENGN LAB, POB 1625, IDAHO FALLS, ID 83415 USA. NR 25 TC 2 Z9 2 U1 0 U2 3 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 SEP PY 1992 VL 40 IS 9 BP 2091 EP 2100 DI 10.1016/0956-7151(92)90126-Y PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JH167 UT WOS:A1992JH16700003 ER PT J AU LU, ZW WEI, SH ZUNGER, A AF LU, ZW WEI, SH ZUNGER, A TI THEORY OF BONDING CHARGE-DENSITY IN BETA' NIAL SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID ATOMIC SCATTERING FACTORS; GAMMA-RAY DIFFRACTOMETRY; ELECTRONIC-STRUCTURE; SILICON; DIFFRACTION; SYSTEMS; COPPER; ALLOYS; METAL; GAAS AB Fox and Tabbernor [Acta metall. mater. 39, 669 (199 1)] have recently measured the four lowest structure factors F(G) of NiAl using highly accurate high energy electron diffraction. We present here a systematic comparison of their results with ab initio band theory, in the context of the local density formalism. We find very good agreement for the three of the four lowest measured structure factors, while our F(200) is approximately 0.4 e/cell higher. We tentatively attribute this difference to uncertainties in the treatment of the temperature factors in non-monoatomic compounds. Indeed, comparing with experiment our calculation for the monoatomic Si crystal (where the temperature term factors out), we find that theory reproduces the measured structure factors to within a very small deviations of approximately 0.02 e/atom. We have also examined the effect of high Fourier components that are not currently amenable to measurements on the ensuing NiAl deformation electron density distribution (DEDD) maps. We find that the truncation of the Fourier series after four structure factors misses the directional d-like charge lobes near the Ni sites. We show that static and dynamic DEDD give a similar picture of the bonding. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 39 TC 28 Z9 28 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 SEP PY 1992 VL 40 IS 9 BP 2155 EP 2165 DI 10.1016/0956-7151(92)90133-Y PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JH167 UT WOS:A1992JH16700010 ER PT J AU KESSLER, H KLEEBE, HJ CANNON, RW POMPE, W AF KESSLER, H KLEEBE, HJ CANNON, RW POMPE, W TI INFLUENCE OF INTERNAL-STRESSES ON CRYSTALLIZATION OF INTERGRANULAR PHASES IN CERAMICS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID GLASS AB Crystallization of the secondary phase in structural ceramics may lead to improved high temperature properties. Internal stresses due to both volume changes upon crystallization and cooling can result in microcrack formation or crack bridging and crack deflection processes affecting mechanical properties. Models for crystallization and stress evolution are developed which treat (i) the equilibrium degree of crystallization for non-relaxed volume mismatch stresses involving the influence of elastic constants, supercooling, volume change and amount of secondary phases on the crystallized volume fraction, (ii) the kinetics of the degree of crystallization leading to the equilibrium state, (iii) possible relaxation mechanisms of stresses involving (a) viscous flow of the intergranular phase and (b) solution-reprecipitation of primary grains and (iv) the crystallization kinetics controlled by simultaneous stress relaxation. C1 MAX PLANCK INST MET RES, W-7000 STUTTGART 80, GERMANY. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP KESSLER, H (reprint author), MAX PLANCK GESELL, ARBEITSGRP MECAN HETEROGENER FESTKORPER, HALLWACHSSTR 3, O-8027 DRESDEN, GERMANY. RI Kleebe, Hans-Joachim/C-5709-2016 NR 17 TC 27 Z9 27 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 SEP PY 1992 VL 40 IS 9 BP 2233 EP 2245 DI 10.1016/0956-7151(92)90142-2 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JH167 UT WOS:A1992JH16700019 ER PT J AU POVIRK, GL STOUT, MG BOURKE, M GOLDSTONE, JA LAWSON, AC LOVATO, M MACEWEN Sr NUTT Sr NEEDLEMAN, A AF POVIRK, GL STOUT, MG BOURKE, M GOLDSTONE, JA LAWSON, AC LOVATO, M MACEWEN, SR NUTT, SR NEEDLEMAN, A TI THERMALLY AND MECHANICALLY INDUCED RESIDUAL STRAINS IN AL-SIC COMPOSITES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID METAL-MATRIX COMPOSITES; NEUTRON-DIFFRACTION; TENSILE PROPERTIES; DEFORMATION; STRESS; MECHANISMS; WHISKERS; MODEL AB Neutron diffraction experiments were conducted on 15 vol.% whisker and 20 vol.% particulate reinforced aluminum/silicon carbide composites subjected to a rapid quench followed by various deformation histories. Corresponding numerical simulations were carried out using an axisymmetric unit cell model, with a phenomenological, isotropic hardening description of matrix plasticity. Thermal expansion and the temperature dependence of material properties were accounted for. For the whisker reinforced matrix, quantitative agreement was generally found between the measured and calculated residual elastic strains. For the particulate reinforced matrix, the calculations tended to overestimate the magnitude of the residual strains parallel to the deformation axis, but very good agreement was obtained transverse to the deformation axis. For the silicon carbide reinforcement both whisker and particulate, the variation of predicted residual elastic strains along the deformation axis was qualitatively consistent with the measurements, although quantitative agreement was often lacking. Measured and predicted residual strains perpendicular to the deformation axis for the silicon carbide typically were not in agreement. Parametric studies were carried out to ascertain the dependence of calculated flow strengths and residual strains on cell and reinforcement aspect ratio, and on reinforcement spacing and shape. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. ALCAN INT LTD, KINGSTON RES & DEV CTR, KINGSTON K7L 5L9, ONTARIO, CANADA. RP POVIRK, GL (reprint author), BROWN UNIV, DIV ENGN, PROVIDENCE, RI 02912 USA. RI Needleman, Alan/A-1879-2008 OI Needleman, Alan/0000-0002-4697-4535 NR 39 TC 72 Z9 73 U1 0 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1992 VL 40 IS 9 BP 2391 EP 2412 DI 10.1016/0956-7151(92)90158-B PG 22 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JH167 UT WOS:A1992JH16700035 ER PT J AU BARLOW, RS FOURGUETTE, DC MUNGAL, MG DIBBLE, RW AF BARLOW, RS FOURGUETTE, DC MUNGAL, MG DIBBLE, RW TI EXPERIMENTS ON THE STRUCTURE OF AN ANNULAR COMPRESSIBLE REACTING SHEAR-LAYER SO AIAA JOURNAL LA English DT Article ID TURBULENT MIXING LAYERS; DAMKOHLER NUMBER; SIMULATIONS AB An axisymmetric burner for the study of compressible reacting shear layers is described, and the ranges of its operating parameters are analyzed. This burner has a central supersonic freejet of resistively heated air, surrounded by a low-speed co-now of fuel-rich H-2-air combustion products. Planar laser-induced fluorescence imaging of OH is used to visualize the structure of the annular reacting shear layer in the near field of the jet. Images from two cases with convective Mach numbers of 0.11 and 0.41 are presented and discussed in terms of previously reported results for nonreacting compressible shear layers. Observed effects of compressibility on the structure and growth rate of the reacting annular shear layer are similar to effects reported in nonreacting flows. Results from a compressible "lifted" flame and from the reaction zone at the boundary of an underexpanded jet are presented. C1 CALTECH,GRAD AERONAUT LAB,PASADENA,CA 91125. STANFORD UNIV,DEPT MECH ENGN,STANFORD,CA 94395. UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720. RP BARLOW, RS (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,TECH STAFF,LIVERMORE,CA 94551, USA. NR 35 TC 7 Z9 8 U1 3 U2 3 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD SEP PY 1992 VL 30 IS 9 BP 2244 EP 2251 DI 10.2514/3.11211 PG 8 WC Engineering, Aerospace SC Engineering GA JM022 UT WOS:A1992JM02200011 ER PT J AU KORBER, B MYERS, G AF KORBER, B MYERS, G TI SIGNATURE PATTERN-ANALYSIS - A METHOD FOR ASSESSING VIRAL SEQUENCE RELATEDNESS SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; EVOLUTION; TYPE-1; DIVERSITY; SUBSTITUTION; MUTATIONS AB Signature pattern analysis identifies particular sites in amino acid or nucleic acid alignments of variable sequences that are distinctly representative of a query set of sequences relative to a background set. We explore the merits of using signature patterns for analysis of HIV-1 (human immunodeficiency virus type 1) sequences in cases of epidemiological linkage and potential superinfection. For these purposes, query sets are viral sequences that are all derived from one HIV-1 infected individual, hence the signature pattern is the array of sites that are characteristic of the range of viral variants obtained from that person. Once a signature pattern has been objectively defined, it can be used to examine other viral sequences from other individuals for evidence of genetic relatedness. A computer program to facilitate this analysis, VESPA, is described and applied to sequence data gathered during the investigation of HIV-1 transmission in a dental practice. The implications of signature polymorphisms seen within an infected individual, and shared polymorphisms between linked individuals, are also considered. VESPA may also be applied to the molecular analysis of biological phenotypes. RP KORBER, B (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,THEORET BIOL GRP T10,MS K710,LOS ALAMOS,NM 87545, USA. OI Korber, Bette/0000-0002-2026-5757 NR 27 TC 172 Z9 174 U1 1 U2 1 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD SEP PY 1992 VL 8 IS 9 BP 1549 EP 1560 DI 10.1089/aid.1992.8.1549 PG 12 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JW296 UT WOS:A1992JW29600005 PM 1457200 ER PT J AU SUPERKO, HR AF SUPERKO, HR TI DECAFFEINATED COFFEE AND SERUM LDL-CHOLESTEROL CONCENTRATIONS - REPLY SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Letter RP SUPERKO, HR (reprint author), LAWRENCE BERKELEY LAB,CHOLESTEROL RES CTR,BERKELEY,CA 94720, USA. OI Superko, H. Robert/0000-0002-3542-0393 NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC CLINICAL NUTRITION PI BETHESDA PA 9650 ROCKVILLE PIKE, SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD SEP PY 1992 VL 56 IS 3 BP 605 EP 605 PG 1 WC Nutrition & Dietetics SC Nutrition & Dietetics GA JL271 UT WOS:A1992JL27100023 ER PT J AU SUPERKO, HR AF SUPERKO, HR TI COFFEE AND LIPOPROTEIN CHOLESTEROL - REPLY SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Letter RP SUPERKO, HR (reprint author), LAWRENCE BERKELEY LAB,CHOLESTEROL RES CTR,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC CLINICAL NUTRITION PI BETHESDA PA 9650 ROCKVILLE PIKE, SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD SEP PY 1992 VL 56 IS 3 BP 606 EP 606 PG 1 WC Nutrition & Dietetics SC Nutrition & Dietetics GA JL271 UT WOS:A1992JL27100025 ER PT J AU SIEMANN, R AF SIEMANN, R TI PHASE-STABILITY OF SYNCHROTRON ACCELERATION SO AMERICAN JOURNAL OF PHYSICS LA English DT Article RP SIEMANN, R (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 8 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 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD SEP PY 1992 VL 60 IS 9 BP 853 EP 856 DI 10.1119/1.17069 PG 4 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA JK786 UT WOS:A1992JK78600017 ER PT J AU PASTERNAK, MP TAYLOR, RD JEANLOZ, R BOHLEN, SR AF PASTERNAK, MP TAYLOR, RD JEANLOZ, R BOHLEN, SR TI MAGNETIC-ORDERING TRANSITION IN MG0.9FE0.1SIO3 ORTHO-PYROXENE SO AMERICAN MINERALOGIST LA English DT Article ID SPIN RELAXATION; MOSSBAUER; ENTROPIES AB Mossbauer spectroscopy of polycrystalline synthetic orthopyroxene of composition (Mg0.9Fe0.1SiO3)-Fe-57 demonstrates that magnetic ordering sets in at temperatures below 5 (+/- 2) K. The low Fe concentration of the sample implies that spin correlations must extend over unit-cell dimensions (approximately 0.5 nm or more), and that magnetic ordering can contribute to the third-law entropies of Fe-poor minerals. C1 UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. US GEOL SURVEY,MENLO PK,CA 94025. TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP PASTERNAK, MP (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 26 TC 14 Z9 14 U1 0 U2 0 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1130 17TH ST NW SUITE 330, WASHINGTON, DC 20036 SN 0003-004X J9 AM MINERAL JI Am. Miner. PD SEP-OCT PY 1992 VL 77 IS 9-10 BP 901 EP 903 PG 3 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA JT825 UT WOS:A1992JT82500001 ER PT J AU SCHUPP, EW AF SCHUPP, EW TI THE JANZEN-CONNELL MODEL FOR TROPICAL TREE DIVERSITY - POPULATION IMPLICATIONS AND THE IMPORTANCE OF SPATIAL SCALE SO AMERICAN NATURALIST LA English DT Note ID RAIN-FOREST TREE; SEED PREDATION; COEXISTENCE; EQUILIBRIUM; RECRUITMENT; UNDERSTORY; DISPERSAL; GAPS RP SCHUPP, EW (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. RI Schupp, Eugene/F-1834-2010 NR 27 TC 115 Z9 124 U1 3 U2 27 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0003-0147 J9 AM NAT JI Am. Nat. PD SEP PY 1992 VL 140 IS 3 BP 526 EP 530 DI 10.1086/285426 PG 5 WC Ecology; Evolutionary Biology SC Environmental Sciences & Ecology; Evolutionary Biology GA JG858 UT WOS:A1992JG85800010 PM 19426055 ER PT J AU HUTH, J AF HUTH, J TI THE SEARCH FOR THE TOP QUARK SO AMERICAN SCIENTIST LA English DT Article RP HUTH, J (reprint author), FERMI NATL ACCELERATOR LAB,COLLIDER DETECTOR,MAIL STN 318,BATAVIA,IL 60510, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU SIGMA XI-SCI RES SOC PI RES TRIANGLE PK PA PO BOX 13975, RES TRIANGLE PK, NC 27709 SN 0003-0996 J9 AM SCI JI Am. Scientist PD SEP-OCT PY 1992 VL 80 IS 5 BP 430 EP 443 PG 14 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JP611 UT WOS:A1992JP61100004 ER PT J AU WANG, YW YEUNG, ES AF WANG, YW YEUNG, ES TI INDIRECT DETECTION METHOD FOR LIQUID-CHROMATOGRAPHY BASED ON ELECTROGENERATED LUMINOL CHEMILUMINESCENCE SO ANALYTICA CHIMICA ACTA LA English DT Article DE CHEMILUMINESCENCE; LIQUID CHROMATOGRAPHY; INDIRECT DETECTION ID CHEMI-LUMINESCENCE DETECTION; AMINO-ACIDS; COBALT AB An indirect electrogenerated luminol chemiluminescence detection method is described; OH-, which is a reactant in the luminol chemiluminescence system, is produced by the reduction of hydrogen peroxide in a d.c. electrolysis flow cell. Other reactants and supporting electrolyte are contained in the eluent. By the displacement of the reactants in the column the samples give negative peaks. The optimum conditions for electrogenerated chemiluminescence are discussed and a typical liquid chromatogram is given. The theoretical efficiency of the method was established. The technique has detection limits of 0.011-0.058-mu-mol depending on sample type. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. RP WANG, YW (reprint author), HEBEI ACAD SCI,INST GEOG,SHIJIAZHUANG 050011,PEOPLES R CHINA. NR 21 TC 10 Z9 13 U1 4 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD SEP 1 PY 1992 VL 266 IS 2 BP 295 EP 300 DI 10.1016/0003-2670(92)85055-B PG 6 WC Chemistry, Analytical SC Chemistry GA JK345 UT WOS:A1992JK34500017 ER PT J AU NICKOLOFF, JA REYNOLDS, RJ AF NICKOLOFF, JA REYNOLDS, RJ TI ELECTROPORATION-MEDIATED GENE-TRANSFER EFFICIENCY IS REDUCED BY LINEAR PLASMID CARRIER DNAS SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID MOUSE L-CELLS; MAMMALIAN-CELLS; HOMOLOGOUS RECOMBINATION; BACTERIAL GENE; EXPRESSION; VECTORS; CLONING; REPAIR; BREAKS C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP NICKOLOFF, JA (reprint author), HARVARD UNIV,SCH PUBL HLTH,DEPT CANC BIOL,BOSTON,MA 02115, USA. FU NCI NIH HHS [CA 54079]; PHS HHS [R01 42390] NR 21 TC 12 Z9 13 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD SEP PY 1992 VL 205 IS 2 BP 237 EP 243 DI 10.1016/0003-2697(92)90429-B PG 7 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA JM682 UT WOS:A1992JM68200008 PM 1443569 ER PT J AU BUTLER, MA RICCO, AJ AF BUTLER, MA RICCO, AJ TI FIBER OPTIC MICROMIRROR STUDIES OF THE INTERACTION OF THIN COPPER-FILMS WITH AN ORGANOPHOSPHONATE SO ANALYTICAL CHEMISTRY LA English DT Article ID MICROSENSOR COATINGS; VAPOR CHALLENGES; REFLECTIVITY CHANGES; PATTERN-RECOGNITION; PHOSPHORUS ESTERS; POLYMER SORBENTS; DERIVATIVES; RESPONSES; OXIDATION; SORPTION AB In a pair of recent papers,1 the resistivity change in thin (100-angstrom) films of copper was used as a means to detect the presence of diisopropyl methylphosphonate (DIMP). In this paper we explore the copper/DIMP interaction by measuring changes In the reflectivity of thin copper films deposited on the end of optical fibers. This optical detection technique is a sensitive probe of the density of electronic states in thin metal films and, therefore, gives responses analogous to resistivity measurements. We find that DIMP in dry air slowly oxidizes the copper films to a definitive product, the optical properties of which suggest it to be a one-to-one adduct of Cu2O and CuO. Reversible DIMP-induced reflectivity changes are observed only when the films are partially oxidized, i.e., they have not been completely converted to the product oxide. Unfortunately, copper films in all stages of the oxidation process also respond to water vapor, precluding their use for selective detection of DIMP. RP BUTLER, MA (reprint author), SANDIA NATL LABS, DEPT MICROSENSOR 1315, ALBUQUERQUE, NM 87185 USA. RI Ricco, Antonio/A-5273-2010; OI Ricco, Antonio/0000-0002-2355-4984 NR 33 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1992 VL 64 IS 17 BP 1851 EP 1854 DI 10.1021/ac00041a020 PG 4 WC Chemistry, Analytical SC Chemistry GA JK796 UT WOS:A1992JK79600021 ER PT J AU TODD, PJ SHORT, RT GRIMM, CC HOLLAND, WM MARKEY, SP AF TODD, PJ SHORT, RT GRIMM, CC HOLLAND, WM MARKEY, SP TI ORGANIC ION IMAGING USING TANDEM MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID SURFACE-INDUCED DISSOCIATION; FAST ATOM BOMBARDMENT; BEAM PARAMETERS; LIQUID MATRICES; EMISSION; BIOMOLECULES; CHEMISTRY; GLYCEROL; SPECTRA AB A triple-quadrupole mass spectrometer has been interfaced with a wide-angle secondary ion microprobe. The combination permits acquisition of data necessary to determine the distribution of targeted organic analytes even in the presence of overwhelming isobaric interference. Micrographs generated from using secondary ion intensity alone are compared to those generated using secondary ionization with tandem mass spectrometry (MS/MS), both for image reference and to show the improvement in image quality that can be attained when MS/MS is employed. Inhomogeneous mixtures of glycerol, KCl, and asparagine on 1-cm-diameter aluminum targets were used to demonstrate the instrument's selectivity. Secondary ions generated from samples of this system Include isobaric Cs-133+ implanted from the primary ion beam, the g-41+-glycerol adduct, and protonated asparagine. C1 NIMH,BETHESDA,MD 20892. RP TODD, PJ (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,BLDG 5510,POB 2008,OAK RIDGE,TN 37831, USA. FU NIGMS NIH HHS [R01 GM41617] NR 29 TC 13 Z9 13 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1992 VL 64 IS 17 BP 1871 EP 1878 DI 10.1021/ac00041a023 PG 8 WC Chemistry, Analytical SC Chemistry GA JK796 UT WOS:A1992JK79600024 PM 1416040 ER PT J AU SONG, JS SZALDA, DJ BULLOCK, RM LAWRIE, CJC RODKIN, MA NORTON, JR AF SONG, JS SZALDA, DJ BULLOCK, RM LAWRIE, CJC RODKIN, MA NORTON, JR TI HYDRIDE TRANSFER BY HYDRIDE TRANSITION-METAL COMPLEXES - IONIC HYDROGENATION OF ALDEHYDES AND KETONES, AND STRUCTURAL CHARACTERIZATION OF AN ALCOHOL COMPLEX SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID CARBONYL HYDRIDES; PROTON-TRANSFER; ACIDS; MECHANISM; REDUCTION; KINETICS; ACETONE; RATES; BOND AB The rate-determining step in the hydrogenation of aldehydes or ketones by hydrido complexes and acids appears to be the hydride transfer from the complex to the protonated carbonyl compound. The resulting alcohol is initially hound as ligand, as confirmed by an X-ray crystal structure analysis of the alcohol complex 1. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523. CUNY BERNARD M BARUCH COLL,NEW YORK,NY 10010. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 23 TC 76 Z9 76 U1 1 U2 6 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD SEP PY 1992 VL 31 IS 9 BP 1233 EP 1235 DI 10.1002/anie.199212331 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JR575 UT WOS:A1992JR57500030 ER PT J AU REYNOLDS, JG SENDLINGER, SC MURRAY, AM HUFFMAN, JC CHRISTOU, G AF REYNOLDS, JG SENDLINGER, SC MURRAY, AM HUFFMAN, JC CHRISTOU, G TI PYRIDINE-2-THIOLATO COMPLEXES OF V(II), V(III), AND V(IV) WITH UNUSUAL STRUCTURAL FEATURES SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID CRYSTAL-STRUCTURE; HYDROTREATING CATALYSTS; THIOLATE CHEMISTRY; VANADIUM; METAL; PETROLEUM; RESONANCE; BINDING C1 INDIANA UNIV, CTR MOLEC STRUCT, BLOOMINGTON, IN 47405 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP REYNOLDS, JG (reprint author), INDIANA UNIV, DEPT CHEM, BLOOMINGTON, IN 47405 USA. RI Christou, George /A-3072-2014 NR 26 TC 41 Z9 41 U1 1 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD SEP PY 1992 VL 31 IS 9 BP 1253 EP 1255 DI 10.1002/anie.199212531 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JR575 UT WOS:A1992JR57500040 ER PT J AU HASEGAWA, A CHEN, L AF HASEGAWA, A CHEN, L TI RING CURRENT INSTABILITIES IN THE MAGNETOHYDRODYNAMIC FREQUENCY-RANGE SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Article ID COMPRESSIONAL ULF WAVES; MAGNETOSPHERE; PULSATIONS; PLASMA; PROPAGATION AB This report summarizes recent theoretical developments in ring current plasma instabilities in the magnetohydrodynamic (MHD) frequency range but with the effect of finite Larmor radius, and discusses its relevance to satellite-based observations. Possible instabilities are the bounce resonant instabilities caused by a humped energy distribution, the drift mirror instability caused by an anisotropic pressure (P(perpendicular-to) > P(parallel-to)) and the drift wave type instability caused by a combination of drift-bounce resonance and reduced Alfven frequency due to a high beta loading of the flux tube (the drift Alfven ballooning instability). Here, beta=plasma/magnetic pressures. Mechanisms leading to turbulence are also discussed. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. PRINCETON UNIV,DEPT ASTROPHYS SCI,PRINCETON,NJ 08544. AT&T BELL LABS,MURRAY HILL,NJ 07974. RI chen, liu/I-2297-2013 NR 15 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD SEP PY 1992 VL 10 IS 9 BP 644 EP 646 PG 3 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JT159 UT WOS:A1992JT15900002 ER PT J AU KHERICHA, ST ROHACH, AF DANOFSKY, RA AF KHERICHA, ST ROHACH, AF DANOFSKY, RA TI DEVELOPMENT OF 2-ENERGY GROUP, ONE-DIMENSIONAL, FREQUENCY-DEPENDENT DETECTOR ADJOINT FUNCTIONS BASED ON THE NODAL METHOD SO ANNALS OF NUCLEAR ENERGY LA English DT Article ID NEUTRON NOISE DIAGNOSTICS; CONTROL ROD VIBRATIONS; MODEL AB One-dimensional, two-energy group computer codes designed to calculate the response of a detector to a vibrating absorber in a reactor core were developed. This work incorporated a concept of local/global components based on the frequency-dependent detector adjoint function and a nodalization technique. The frequency-dependent detector adjoint functions presented by complex equations were expanded into real and imaginary parts. In the nodalization technique, the flux or detector adjoint function was expanded into polynomials about the center point of each node. The phase angles and the magnitudes of the two-energy group detector adjoint functions were calculated using a one-dimensional computer code. The calculations were made for a neutron detector located in the middle of the south core tank of the UTR-10 reactor. The reactor is located at Iowa State University. Results were compared with the exact analytical solution and were found to be within 2% of the values. C1 UNIV IOWA,DEPT NUCL MED,IOWA CITY,IA 52242. RP KHERICHA, ST (reprint author), EG&G IDAHO INC,IDAHO FALLS,ID 83402, USA. NR 27 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD SEP PY 1992 VL 19 IS 9 BP 495 EP 506 DI 10.1016/0306-4549(92)90039-E PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JK212 UT WOS:A1992JK21200002 ER PT J AU CRUDEN, DL WOLFRAM, JH ROGERS, RD GIBSON, DT AF CRUDEN, DL WOLFRAM, JH ROGERS, RD GIBSON, DT TI PHYSIOLOGICAL-PROPERTIES OF A PSEUDOMONAS STRAIN WHICH GROWS WITH PARAXYLENE IN A 2-PHASE (ORGANIC-AQUEOUS) MEDIUM SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID TOL PLASMID; ESCHERICHIA-COLI; MICROBIAL OXIDATION; ARVILLA MT-2; PUTIDA; TOLUENE; METABOLISM; MUTANTS; BENZENE; ROUTE AB Pseudomonas putida Idaho utilizes toluene, m-xylene, p-xylene, 1,2,4-trimethylbenzene, and 3-ethyltoluene as growth substrates when these hydrocarbons are provided in a two-phase system at 5 to 50% (vol/vol). Growth also occurs on Luria-Bertani medium in the presence of a wide range of organic solvents. The ability of the organism to grow in the presence of organic solvents is correlated with the logarithm of the octanol-water partition coefficient, with dimethylphthalate (log P(OCT) = 2.3) being the most polar solvent tolerated. During growth with p-xylene (20% [vol/vol]), there was an initial lag period accompanied by cell death, which was followed by a period of exponential growth. The stationary phase of growth was characterized by a dramatic decrease in cell viability, although cell dry weight and turbidity measurements slowly increased. Electron micrographs revealed that during growth in the presence of p-xylene, the outer cell membrane becomes convoluted and membrane fragments are shed into the culture medium. At the same time, the cytoplasmic membrane invaginates, forming vesicles, and becomes disorganized. Electron-dense intracellular inclusions were observed in cells grown with p-xylene (20% [vol/vol]) and p-xylene vapors, which are not present in cells grown with succinate. Attempts to demonstrate the presence of plasmid DNA in P. putida Idaho were negative. However, polarographic studies indicated that the organism utilizes the same pathway for the degradation of toluene, m-xylene, and p-xylene as that used by P. putida mt-2 which contains the TOL plasmid pWWO. Southern hybridization experiments showed that P. putida Idaho contains regions of DNA that are homologous to genes encoding enzymes of the upper operon in the TOL plasmid pWWO. C1 UNIV IOWA,DEPT MICROBIOL,IOWA CITY,IA 52242. UNIV IOWA,CTR BIOCATALYSIS & BIOPROC,IOWA CITY,IA 52242. IDAHO NATL ENGN LAB,IDAHO RES CTR,IDAHO FALLS,ID 83415. NR 38 TC 140 Z9 141 U1 2 U2 9 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 SEP PY 1992 VL 58 IS 9 BP 2723 EP 2729 PG 7 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA JL632 UT WOS:A1992JL63200003 PM 1444381 ER PT J AU SHONNARD, DR TAYLOR, RT TOMPSON, A KNAPP, RB AF SHONNARD, DR TAYLOR, RT TOMPSON, A KNAPP, RB TI HYDRODYNAMIC EFFECTS ON MICROCAPILLARY MOTILITY AND CHEMOTAXIS ASSAYS OF METHYLOSINUS-TRICHOSPORIUM OB3B SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID SOLUBLE METHANE MONOOXYGENASE; BACTERIAL CHEMOTAXIS; PSEUDOMONAS-PUTIDA; TRICHLOROETHYLENE; CHAMBER AB A study of the random motility and chemotaxis of Methylosinus trichosporium OB3b was conducted by using Palleroni-chamber microcapillary assay procedures. Under the growth conditions employed, this methanotroph was observed qualitatively with a microscope to be either slightly motile or essentially nonmotile. However, the cells did not not respond in the microcapillary assays in the manner expected for nonmotile Brownian particles. As a consequence, several hydrodynamic effects on these Palleroni microcapillary assays were uncovered. In the random-motility microcapillary assay, nondiffusive cell accumulations occurred that were strongly dependent upon cell concentration. An apparent minimal random-motility coefficient (mu) for this bacterial cell of 1.0 x 10(-7) cm2/s was estimated from microcapillary assays. A simple alternative spectrophotometric assay, based upon gravitational settling, was developed and shown to be an improvement over the Palleroni microcapillary motility assay for M. trichosporium OB3b in that it yielded a more-accurate threefold-lower random-motility coefficient. In addition, it provided a calculation of the gravitational-settling velocity. In the chemotaxis microcapillary assay, the apparent chemotactic responses were strongest for the highest test-chemical concentrations in the microcapillaries, were correlated with microcapillary fluid density, and were strongly dependent upon the microcapillary volume. A simple method to establish the maximal concentration of a chemical that can be tested and to quantify any contributions of abiotic convection is described. Investigators should be aware of the potential problems due to density-driven convection when using these commonly employed microcapillary assays for studying cells which have low motilities. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. NR 26 TC 11 Z9 12 U1 2 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 SEP PY 1992 VL 58 IS 9 BP 2737 EP 2743 PG 7 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA JL632 UT WOS:A1992JL63200005 PM 1444383 ER PT J AU SCHRAMKE, JA AF SCHRAMKE, JA TI NEUTRALIZATION OF ALKALINE COAL FLY-ASH LEACHATES BY CO2(G) SO APPLIED GEOCHEMISTRY LA English DT Article AB The factors that control pH in alkaline fly ash leachates were investigated in a series of experiments with four fly ashes. The rate at which the fly ash leachates were neutralized by CO2 (g) absorption and subsequent calcite precipitation was directly proportional to S concentrations in the fly ash leachates because of the effects of SO42- on calcite precipitation rates. After the pH of the solutions declined from their initial high values, solution concentrations of Mg increased and further slowed calcite precipitation. The incorporation of SO42- and Mg into the calcite lattice resulted in the precipitation of a CaCO3(s) that is more soluble than pure calcite. As a result, the leachates remained oversaturated with respect to calcite after 18-135 d of reaction time. In fly ash leachates in natural systems, the rate of input of CO2(g) into the leachate is expected to control the overall rate of pH equilibrium. RP SCHRAMKE, JA (reprint author), PACIFIC NW LAB, DEPT ENVIRONM SCI, RICHLAND, WA 99352 USA. NR 0 TC 27 Z9 28 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2927 J9 APPL GEOCHEM JI Appl. Geochem. PD SEP PY 1992 VL 7 IS 5 BP 481 EP 492 DI 10.1016/0883-2927(92)90008-Q PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JM893 UT WOS:A1992JM89300008 ER PT J AU DIFILIPPO, FC PEREZ, RB AF DIFILIPPO, FC PEREZ, RB TI APPLICATION OF A NEW INTEGRAL-REPRESENTATION OF THE KO BESSEL-FUNCTION SO APPLIED MATHEMATICS LETTERS LA English DT Article AB The analysis of either the noise signatures of boiling water reactors or the homogeneous equivalence of a nuclear reactor fuel cell require the analysis of the propagation of neutron waves along the fuel rods embedded in a moderator. During the course of our work, we have found a convenient integral representation of the K0 Bessel function that allowed us to find the relaxation length of the neutron waves. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 5 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0893-9659 J9 APPL MATH LETT JI Appl. Math. Lett. PD SEP PY 1992 VL 5 IS 5 BP 51 EP 53 DI 10.1016/0893-9659(92)90063-F PG 3 WC Mathematics, Applied SC Mathematics GA JK645 UT WOS:A1992JK64500014 ER PT J AU ALTKORN, R CHANG, J HAIDLE, R TAKACS, PZ ULMER, MP AF ALTKORN, R CHANG, J HAIDLE, R TAKACS, PZ ULMER, MP TI ELECTROFORM REPLICATION OF SMOOTH MIRRORS FROM SAPPHIRE MASTERS SO APPLIED OPTICS LA English DT Article DE X-RAY OPTICS; ELECTROFORMED OPTICS AB Mirrors that exhibit mid-to-high-frequency (3 x 10(-4) to 0.1-mu-m-1) roughness as low as 3 angstrom were produced by nickel electroform replication by using a sapphire master. The fabrication procedure and potential applications in x-ray astronomy are discussed. C1 AXONIX INC,EVANSTON,IL 60201. BROOKHAVEN NATL LAB,UPTON,NY 11972. NORTHWESTERN UNIV,EVANSTON,IL 60208. RP ALTKORN, R (reprint author), NORTHWESTERN UNIV,BIRL,1801 MAPLE AVE,EVANSTON,IL 60201, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 1 PY 1992 VL 31 IS 25 BP 5153 EP 5154 PG 2 WC Optics SC Optics GA JL270 UT WOS:A1992JL27000001 ER PT J AU CHEN, J ANGELICI, RJ AF CHEN, J ANGELICI, RJ TI 2,5-DIMETHYLTHIOPHENE COORDINATION TO 3 METAL CENTERS IN THE COMPLEXES (MU-4,S-MU-3-2,5-ME2T)(IRCP-ASTERISK) [M(CO)2CP]2 WHERE M = MO OR W SO APPLIED ORGANOMETALLIC CHEMISTRY LA English DT Article DE THIOPHENE; HYDRODESULFURIZATION; IRIDIUM; MOLYBDENUM; TUNGSTEN ID X-RAY STRUCTURES; THIOPHENE COORDINATION; TRIPLE BOND; MOLECULAR-STRUCTURE; REACTIVITY; HYDRODESULFURIZATION; MECHANISM; LIGAND; CP-STAR-IR(2,5-DIMETHYLTHIOPHENE); CARBONYLS AB The 2,5-dimethylthiophene (2,5-Me2T) ligand in the isomers Cp*Ir(eta-4-2,5-Me2T) (1) and Cp*Ir(C,S-2,5-Me2T) (2) is activated to react with the dimers Cp(CO)2M = M(CO)2Cp[M = Mo (3), W (4)] to give complexes (5, 6) in which the thiophene is coordinated to three metals. Oxidation of 5 with Cp2Fe+ removes [GRAPHICS] the Mo dimer to give Cp*Ir(eta-5-2,5-Me2T)2+. Reaction of 5 with CO displaces the Mo as [CpMo(CO)3]2 to give Cp*Ir(CO)(C,S-2,5-Me2T) (7). Ultraviolet photolysis of 1 provides a convenient route to the ring-opened isomer 2. Despite the remarkable nature of the thiophene coordination in 5 and 6, its reactivity does not suggest new pathways that would lead to the hydrodesulfurization of thiophenes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 29 TC 28 Z9 28 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0268-2605 J9 APPL ORGANOMET CHEM JI Appl. Organomet. Chem. PD SEP PY 1992 VL 6 IS 5 BP 479 EP 487 DI 10.1002/aoc.590060508 PG 9 WC Chemistry, Applied; Chemistry, Inorganic & Nuclear SC Chemistry GA JK483 UT WOS:A1992JK48300007 ER PT J AU DIETZ, ML HORWITZ, EP AF DIETZ, ML HORWITZ, EP TI IMPROVED CHEMISTRY FOR THE PRODUCTION OF Y-90 FOR MEDICAL APPLICATIONS SO APPLIED RADIATION AND ISOTOPES LA English DT Article ID RADIOLYTIC DEGRADATION; Y-90; ANTIBODIES; EXTRACTION; SEPARATION; SOLVENT AB A novel extraction chromatographic method for the preparation of Y-90 of high chemical and radiochemical purity has been developed. After an initial purification of a Sr-90 stock solution and a suitable period of Y-90 ingrowth, the solution is passed through a series of strontium-selective chromatographic columns, each of which lowers the Sr-90 content of the mixture by a factor of approximately 10(3). The Y-90 remaining is freed from any residual Sr-90, from its Zr-90 daughter, and from any remaining impurities by passing the sample through a final column designed to selectively retain yttrium. C1 ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439. NR 37 TC 34 Z9 35 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD SEP PY 1992 VL 43 IS 9 BP 1093 EP 1101 PG 9 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JH863 UT WOS:A1992JH86300007 ER PT J AU MAUSNER, LF MIRZADEH, S SRIVASTAVA, SC AF MAUSNER, LF MIRZADEH, S SRIVASTAVA, SC TI IMPROVED SPECIFIC ACTIVITY OF REACTOR PRODUCED SN-117M WITH THE SZILARD-CHALMERS PROCESS SO APPLIED RADIATION AND ISOTOPES LA English DT Article ID INVIVO BEHAVIOR; RADIOPHARMACEUTICALS; ANIMALS; TIN AB We report an investigation of the application of the Szilard-Chalmers process to improve the specific activity of reactor produced Sn-117. The radiopharmaceutical Sn-117m(4+)DTPA is a promising agent for relieving bone pain in breast and prostate cancer patients. Preliminary studies in these patients have given very encouraging results. For this application high specific activity Sn-117 is required to minimize the quantity of administered DTPA. Using a tetraphenyltin target we have investigated solvent extraction and ion exchange techniques to enrich the radioactive atom concentration. Other variables studied include the effect of neutron flux, total neutron fluence and sample mass. The enrichment factor was comparable for both solvent extraction and ion exchange techniques, but solvent extraction was more convenient. For 1 h irradiations the enrichment factor averaged approximately 70 but declined to approximately 2 after 24 h irradiation due to accumulated radiation damage. The enrichment factor also declined with increasing neutron energy. An isotope effect on the Szilard-Chalmers process was observed as the enrichment factor for Sn-113 was consistently higher than for Sn-117m. RP MAUSNER, LF (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 14 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD SEP PY 1992 VL 43 IS 9 BP 1117 EP 1122 PG 6 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JH863 UT WOS:A1992JH86300010 ER PT J AU MARCUS, RK CABLE, PR DUCKWORTH, DC BUCHANAN, MV POCHKOWSKI, JM WELLER, RR AF MARCUS, RK CABLE, PR DUCKWORTH, DC BUCHANAN, MV POCHKOWSKI, JM WELLER, RR TI A SIMPLE, LENSLESS INTERFACE OF AN RF GLOW-DISCHARGE DEVICE TO AN FT-ICR (FTMS) SO APPLIED SPECTROSCOPY LA English DT Article DE RADIO FREQUENCY; GLOW DISCHARGE; MASS SPECTROMETRY; FT/ICR ID QUADRUPOLE MASS-SPECTROMETER; IONS AB High mass resolving powers (m/DELTA-m = 39,000) are achieved by coupling an rf-powered glow discharge device to an FT/ICR mass spectrometer (FTMS). Introduction of the ions from the externally mounted ion source into the ICR analyzer cell is accomplished without the use of ion optics, relying simply on the ions' kinetic energy in the z (magnetic axis) direction. Magnetic focusing is believed to facilitate efficient ion transport. Basic improvements. in the instrument design are expected to yield resolving powers of > 100,000-sufficient to overcome almost any isobaric interference encountered in plasma source mass spectrometry. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,ENVIRONM TECHNOL SECT,AIKEN,SC 29802. RP MARCUS, RK (reprint author), CLEMSON UNIV,DEPT CHEM,CLEMSON,SC 29634, USA. RI Duckworth, Douglas/B-7171-2015; Buchanan, Michelle/J-1562-2016 OI Duckworth, Douglas/0000-0002-8161-5685; Buchanan, Michelle/0000-0002-8078-4575 NR 18 TC 25 Z9 26 U1 1 U2 2 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD SEP PY 1992 VL 46 IS 9 BP 1327 EP 1330 DI 10.1366/0003702924123683 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JN953 UT WOS:A1992JN95300001 ER PT J AU LI, YS VO-DINH, T STOKES, DL YU, W AF LI, YS VO-DINH, T STOKES, DL YU, W TI SURFACE-ENHANCED RAMAN ANALYSIS OF P-NITROANILINE ON VACUUM EVAPORATION AND CHEMICALLY DEPOSITED SILVER-COATED ALUMINA SUBSTRATES SO APPLIED SPECTROSCOPY LA English DT Article DE SURFACE-ENHANCED RAMAN SCATTERING; CHEMICAL ANALYSIS; LASERS; OPTICAL DISKS; P-NITROANILINE ID FLOW-INJECTION ANALYSIS; SCATTERING ANALYSIS; ELECTRODE; SPECTROSCOPY; PYRIDINE; SPECTRA AB In this study we investigated the surface-enhanced Raman scattering (SERS) properties of p-nitroaniline, which is a potential chemical for use in optical disk coating(s) and also an important compound used as an intermediate or precursor in the manufacture of chemical agents, pesticides, pharmaceuticals, dyes, and antioxidants. The SERS spectra of p-nitroanaline (p-NA), adsorbed on or near the surface of either vacuum thermally evaporated or chemically prepared silver-coated alumina substrates, have been recorded in the frequency region from 200 to 1800 cm-1. The performances of these substrates to enhance the Raman scattering signals were not possible to compare with each other because of different experimental conditions. The infrared (IR) (500-1800 cm- 1) and Raman (200-1800 cm-1) spectra have been recorded for the solution of p-NA. Vibrational assignments were made for the molecule in the frequency region. The Raman enhancement factor was estimated to be on the order of 10, and the absolute limit of optical detection was determined to be 30 femtograms. C1 MEMPHIS STATE UNIV, DEPT CHEM, MEMPHIS, TN 38152 USA. RP VO-DINH, T (reprint author), OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 19 TC 18 Z9 18 U1 1 U2 6 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 5320 SPECTRUM DRIVE SUITE C, FREDERICK, MD 21703 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD SEP PY 1992 VL 46 IS 9 BP 1354 EP 1357 DI 10.1366/0003702924123674 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JN953 UT WOS:A1992JN95300005 ER PT J AU DATTWYLER, RJ LUFT, BJ GOREVIC, PD DUNN, J AF DATTWYLER, RJ LUFT, BJ GOREVIC, PD DUNN, J TI LYME ARTHRITIS, A PROSPECTIVE-STUDY ON THE EFFECT OF TREATMENT ON THE SEROLOGIC RESPONSE SO ARTHRITIS AND RHEUMATISM LA English DT Meeting Abstract C1 SUNY STONY BROOK,STONY BROOK,NY 11794. BROOKHAVEN LABS,UPTON,NY. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0004-3591 J9 ARTHRITIS RHEUM JI Arthritis Rheum. PD SEP PY 1992 VL 35 IS 9 SU S BP S183 EP S183 PG 1 WC Rheumatology SC Rheumatology GA JR158 UT WOS:A1992JR15800874 ER PT J AU MORAN, EC HALPERN, JP BOTHUN, GD BECKER, RH AF MORAN, EC HALPERN, JP BOTHUN, GD BECKER, RH TI WAS 49 - MIRROR FOR A HIDDEN SEYFERT-1 NUCLEUS SO ASTRONOMICAL JOURNAL LA English DT Article ID EMISSION-LINE GALAXIES; ACTIVE GALAXIES; IONIZING-RADIATION; X-RAY; RADIO; IONIZATION; SAMPLE; SPECTROPOLARIMETRY; NGC-1068 AB Was 49 is an interacting system of galaxies at z=0.063 containing two Seyfert nuclei. Spectra of the nuclei indicate that Was 49a is a normal Seyfert 2, while Was 49b is a "hidden" Seyfert 1 as indicated by its strong narrow emission lines, weak broad Balmer lines, and weak featureless continuum. Spatially resolved long-slit spectra of Was 49 show strong, extended emission lines throughout the system. These provide independent evidence for a powerful source of ionizing radiation that is obscured from our line of sight. We have derived estimates of the intrinsic ionizing luminosities of both nuclei on the basis of standard photoionization models applied to the extended emission lines. These calculations show that Was 49a is not significantly obscured, but that Was 49b is approximately 200 times more luminous than it is observed to be and is chiefly responsible for the photoionization of the interstellar medium of its companion. The intrinsic high-energy luminosity of Was 49b is predicted to be > 10(45) erg s-1. We also observed Was 49 with the VLA. The radio luminosity of Was 49b places it on the high-luminosity tail of the Seyfert radio luminosity function, along with all eight other published examples of hidden Seyfert I's. We conclude that the extreme radio luminosity of hidden Seyfert I's is an intrinsic property of these objects, and rules out the strong version of the unified Seyfert scheme in which Seyfert classification is purely a viewing angle effect. Some Seyfert 2 galaxies must then be "true" Seyfert 2's. C1 UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP MORAN, EC (reprint author), COLUMBIA UNIV,COLUMBIA ASTROPHYS LAB,NEW YORK,NY 10027, USA. NR 31 TC 31 Z9 31 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 SEP PY 1992 VL 104 IS 3 BP 990 EP 999 DI 10.1086/116292 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JL466 UT WOS:A1992JL46600007 ER PT J AU LEVIN, S BENSADOUN, M BERSANELLI, M DEAMICI, G KOGUT, A LIMON, M SMOOT, G AF LEVIN, S BENSADOUN, M BERSANELLI, M DEAMICI, G KOGUT, A LIMON, M SMOOT, G TI A MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND TEMPERATURE AT 7.5 GHZ SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND ID RADIATION; SPECTRUM; WAVELENGTH AB We have measured the temperature of the cosmic microwave background (CMB) radiation at a frequency of 7.5 GHz (4 cm wavelength), obtaining a brightness temperature of T(CMB) = 2.70 +/- 0.08 K (68% confidence level). The measurement was made from a site near the geographical South Pole during the austral spring of 1989 and was part of an international collaboration to measure the CMB spectrum at low frequencies with a variety of radiometers from several different sites. This recent result is in agreement with our 1988 measurement at the same frequency, which was made from a different site with significantly different systematic errors. The combined result of the 1988 and 1989 measurements is 2.64 +/- 0.06 K. C1 LAWRENCE BERKELEY LAB, SPACE SCI LAB, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NASA, GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. CNR, IFC, I-20133 MILAN, ITALY. RI Kogut, Alan/D-6293-2012 NR 11 TC 20 Z9 20 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1992 VL 396 IS 1 BP 3 EP 9 DI 10.1086/171692 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ358 UT WOS:A1992JJ35800002 ER PT J AU FREEDMAN, WL MADORE, BF HAWLEY, SL HOROWITZ, IK MOULD, J NAVARRETE, M SALLMEN, S AF FREEDMAN, WL MADORE, BF HAWLEY, SL HOROWITZ, IK MOULD, J NAVARRETE, M SALLMEN, S TI NEW CEPHEID DISTANCES TO NEARBY GALAXIES BASED ON BVRI CCD PHOTOMETRY .3. NGC-300 SO ASTROPHYSICAL JOURNAL LA English DT Article DE CEPHEIDS; GALAXIES, DISTANCES AND REDSHIFTS; GALAXIES, INDIVIDUAL (NGC-300); LOCAL GROUP; TECHNIQUES, PHOTOMETRIC ID SCULPTOR GROUP GALAXIES; LOCAL VELOCITY-FIELD; HUBBLE CONSTANT; STARS; REGULARITY; IC-1613; STEPS AB A true distance modulus of (m - M)0 = 26.66 +/- 0.10 mag (corresponding to 2.1 +/- 0.1 Mpc) has been determined for the Sculptor Group spiral galaxy NGC 300. New CCD data have been obtained for a sample of known Cepheids in this galaxy from which apparent distance moduli at B, V, R, and I wavelengths are determined. Combining the data available at different wavelengths, and assuming a true distance modulus to the LMC of 18.5 mag, a true distance modulus is obtained for NGC 300, corrected for the effects of interstellar reddening. The availability of a new distance to NGC 300 brings to five the total number of galaxies with new CCD photometry of Cepheids, useful for calibration of the Hubble constant. C1 CALTECH,JET PROPULS LAB 100-22,CTR INFRARED PROC & ANAL,NASA,IPAC,PASADENA,CA 91125. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. CALTECH,DIV PHYS MATH & ASTRON,PASADENA,CA 91125. NATL OPT ASTRON OBSERV,CERRO TOLOLO INTER AMER OBSERV,LA SERENA 1353,CHILE. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP FREEDMAN, WL (reprint author), CARNEGIE INST WASHINGTON,THE OBSERV,813 SANTA BARBARA ST,BALTIMORE,MD 21210, USA. NR 25 TC 81 Z9 81 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 SEP 1 PY 1992 VL 396 IS 1 BP 80 EP & DI 10.1086/171698 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ358 UT WOS:A1992JJ35800008 ER PT J AU BENNETT, CL SMOOT, GF HINSHAW, G WRIGHT, EL KOGUT, A DEAMICI, G MEYER, SS WEISS, R WILKINSON, DT GULKIS, S JANSSEN, M BOGGESS, NW CHENG, ES HAUSER, MG KELSALL, T MATHER, JC MOSELEY, SH MURDOCK, TL SILVERBERG, RF AF BENNETT, CL SMOOT, GF HINSHAW, G WRIGHT, EL KOGUT, A DEAMICI, G MEYER, SS WEISS, R WILKINSON, DT GULKIS, S JANSSEN, M BOGGESS, NW CHENG, ES HAUSER, MG KELSALL, T MATHER, JC MOSELEY, SH MURDOCK, TL SILVERBERG, RF TI PRELIMINARY SEPARATION OF GALACTIC AND COSMIC MICROWAVE EMISSION FOR THE COBE DIFFERENTIAL MICROWAVE RADIOMETER SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS; GALAXY, GENERAL ID BACKGROUND-RADIATION; CONTINUUM EMISSION; RAY ELECTRONS; 408 MHZ; FLUCTUATIONS; ANISOTROPY; REGION; GALAXY; DUST; SKY AB The COBE Differential Microwave Radiometer (DMR) anisotropy experiment is sufficiently sensitive and free from systematic errors that our knowledge of Galactic emission is a limiting factor in interpreting the measurements of the 1 yr DMR maps. In this paper we construct preliminary models of microwave emiSSion from our Galaxy based on COBE and other data for the purpose of distinguishing cosmic and Galactic signals. DMR maps, with the modeled Galactic emission removed, are fitted for a quadrupole distribution. Our best estimate of the cosmic quadrupole is found to be Q(rms) = 13 +/- 4-mu-K, (DELTA-T/T)Q = (4.8 +/- 1.5) x 10(-6). Autocorrelation functions for individual Galactic components are presented. When Galactic emission is removed from the DMR data, the residual fluctuations are virtually unaffected, and therefore they are not dominated by any known Galactic emission component. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. JET PROP LAB,PASADENA,CA 91109. GEN RES CORP,DANVERS,MA 01923. RP BENNETT, CL (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,CODE 685,GREENBELT,MD 20771, USA. RI Moseley, Harvey/D-5069-2012; Kogut, Alan/D-6293-2012 NR 42 TC 202 Z9 202 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1992 VL 396 IS 1 BP L7 EP & DI 10.1086/186505 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ359 UT WOS:A1992JJ35900002 ER PT J AU SMOOT, GF BENNETT, CL KOGUT, A WRIGHT, EL AYMON, J BOGGESS, NW CHENG, ES DEAMICI, G GULKIS, S HAUSER, MG HINSHAW, G JACKSON, PD JANSSEN, M KAITA, E KELSALL, T KEEGSTRA, P LINEWEAVER, C LOEWENSTEIN, K LUBIN, P MATHER, J MEYER, SS MOSELEY, SH MURDOCK, T ROKKE, L SILVERBERG, RF TENORIO, L WEISS, R WILKINSON, DT AF SMOOT, GF BENNETT, CL KOGUT, A WRIGHT, EL AYMON, J BOGGESS, NW CHENG, ES DEAMICI, G GULKIS, S HAUSER, MG HINSHAW, G JACKSON, PD JANSSEN, M KAITA, E KELSALL, T KEEGSTRA, P LINEWEAVER, C LOEWENSTEIN, K LUBIN, P MATHER, J MEYER, SS MOSELEY, SH MURDOCK, T ROKKE, L SILVERBERG, RF TENORIO, L WEISS, R WILKINSON, DT TI STRUCTURE IN THE COBE DIFFERENTIAL MICROWAVE RADIOMETER 1ST-YEAR MAPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS ID COSMIC BACKGROUND-RADIATION; INFLATIONARY UNIVERSE; ANISOTROPIES; PERTURBATIONS AB The first year of data from the Differential Microwave Radiometers (DMR) on the Cosmic Backgoround Explorer (COBE) show statistically significant (> 7-sigma) structure that is well described as scale-invariant fluctuations with a Gaussian distribution. The major portion of the observed structure cannot be attributed to known systematic errors in the instrument, artifacts generated in the data processing, or known Galactic emission. The structure is consistent with a thermal spectrum at 31, 53, and 90 GHz as expected for cosmic microwave background anisotropy. The rms sky variation, smoothed to a total 10-degrees FWHM Gaussian, is 30 +/- 5-mu-K (DELTA-T/T = 11 x 10(-6)) for Galactic latitude \b\ > 20-degrees data with the dipole anisotropy removed. The rms cosmic quadrupole amplitude is 13 +/- 4-mu-K (DELTA-T/T almost-equal-to 5 x 10(-6)). The angular autocorrelation of the signal in each radiometer channel and cross-correlation between channels are consistent and give a primordial fluctuation power-law spectrum with index n = 1.1 +/- 0.5, and an rms-quadrupole-normalized amplitude of 16 +/- 4-mu-K (DELTA-T/T almost-equal-to 6 x 10(-6)) . These features are in accord with the Harrison-Zel'dovich (scale-invariant, n = 1) spectrum predicted by models of inflationary cosmology. The low overall fluctuation amplitude is consistent with theoretical predictions of the minimal level gravitational potential variations that would give rise to the observed present day structure. C1 LAWRENCE BERKELEY LAB,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. JET PROP LAB,PASADENA,CA 91109. HUGHES STX CORP,LANHAM,MD 20706. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. GEN RES CORP,DANVERS,MA 01923. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RP SMOOT, GF (reprint author), LAWRENCE BERKELEY LAB,SPACE SCI LAB,BLDG 50-351,BERKELEY,CA 94720, USA. RI Moseley, Harvey/D-5069-2012; Kogut, Alan/D-6293-2012; Rokke, Laurie/I-5642-2015 OI Rokke, Laurie/0000-0002-5696-7240 NR 29 TC 1823 Z9 1829 U1 5 U2 80 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1992 VL 396 IS 1 BP L1 EP & DI 10.1086/186504 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ359 UT WOS:A1992JJ35900001 ER PT J AU WRIGHT, EL MEYER, SS BENNETT, CL BOGGESS, NW CHENG, ES HAUSER, MG KOGUT, A LINEWEAVER, C MATHER, JC SMOOT, GF WEISS, R GULKIS, S HINSHAW, G JANSSEN, M KELSALL, T LUBIN, PM MOSELEY, SH MURDOCK, TL SHAFER, RA SILVERBERG, RF WILKINSON, DT AF WRIGHT, EL MEYER, SS BENNETT, CL BOGGESS, NW CHENG, ES HAUSER, MG KOGUT, A LINEWEAVER, C MATHER, JC SMOOT, GF WEISS, R GULKIS, S HINSHAW, G JANSSEN, M KELSALL, T LUBIN, PM MOSELEY, SH MURDOCK, TL SHAFER, RA SILVERBERG, RF WILKINSON, DT TI INTERPRETATION OF THE COSMIC MICROWAVE BACKGROUND-RADIATION ANISOTROPY DETECTED BY THE COBE DIFFERENTIAL MICROWAVE RADIOMETER SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS; COSMOLOGY, THEORY; GALAXIES, CLUSTERING ID COLD DARK MATTER; LARGE-SCALE ANISOTROPY; DENSITY-FLUCTUATIONS; UNIVERSE; NUCLEOSYNTHESIS; PERTURBATIONS; MILLIMETERS; VELOCITY AB We compare the large-scale cosmic background anisotropy detected by the COBE Differential Microwave Radiometer (DMR) instrument to the sensitive previous measurements on various angular scales, and to the predictions of a wide variety of models of structure formation driven by gravitational instability. The observed anisotropy is consistent with all previously measured upper limits and with a number of dynamical models of structure formation. For example, the data agree with an unbiased cold dark matter (CDM) model with H-0 = 50 km s-1 Mpc-1 and DELTA-M/M = 1 in a 16 Mpc radius sphere. Other models, such as CDM plus massive neutrinos [hot dark matter (HDM)], or CDM with a nonzero cosmological constant are also consistent with the COBE detection and can provide the extra power seen on 5-10,000 km s-1 scales. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. JET PROP LAB,PASADENA,CA 91109. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. GEN RES CORP,DANVERS,MA 01923. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RP WRIGHT, EL (reprint author), UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024, USA. RI Moseley, Harvey/D-5069-2012; Kogut, Alan/D-6293-2012 NR 39 TC 388 Z9 388 U1 0 U2 6 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1992 VL 396 IS 1 BP L13 EP L18 DI 10.1086/186506 PN 2 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ359 UT WOS:A1992JJ35900003 ER PT J AU HUEBNER, WF KEADY, JJ LYON, SP AF HUEBNER, WF KEADY, JJ LYON, SP TI SOLAR PHOTO RATES FOR PLANETARY-ATMOSPHERES AND ATMOSPHERIC POLLUTANTS SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Review ID ULTRAVIOLET-ABSORPTION SPECTRUM; PHOTOABSORPTION CROSS-SECTIONS; DIPOLE OSCILLATOR-STRENGTHS; CODATA TASK GROUP; VACUUM-ULTRAVIOLET; GAS-PHASE; PHOTOCHEMICAL DATA; QUANTUM YIELDS; IRRADIANCE VARIATIONS; COMETARY ATMOSPHERES AB Unattenuated solar photo rate coefficients and excess energies for dissociation, ionization, and dissociative ionization are presented for atomic and molecular species that have been identified or are suspected to exist in the atmospheres of planets, satellites (moons), comets, or as pollutants in the Earth atmosphere. The branching ratios and cross sections with resonances have been tabulated to the greatest detail possible and the rate coefficients and excess energies have been calculated from them on a grid of small wavelength bins for the quiet and the active Sun at 1 AU heliocentric distance. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP HUEBNER, WF (reprint author), SW RES INST,SAN ANTONIO,TX 78284, USA. NR 260 TC 395 Z9 396 U1 0 U2 7 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1992 VL 195 IS 1 BP 1 EP & DI 10.1007/BF00644558 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JW256 UT WOS:A1992JW25600001 ER PT J AU HAN, XL WU, CL AF HAN, XL WU, CL TI NUCLEAR SUPERDEFORMATION DATA TABLES SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID HIGH-SPIN; HG NUCLEI; BANDS; ALIGNMENT; REGION; STATES; SYMMETRY; HG-192; DECAY C1 OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104. RP HAN, XL (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 32 TC 26 Z9 27 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 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD SEP PY 1992 VL 52 IS 1 BP 43 EP 108 DI 10.1016/0092-640X(92)90009-7 PG 66 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA JP535 UT WOS:A1992JP53500003 ER PT J AU RILEY, SJ AF RILEY, SJ TI GAS-PHASE REACTIONS OF TRANSITION-METAL CLUSTERS SO BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article DE ADSORPTION; CLUSTERS; GASES; METALS; SURFACES ID IRON CLUSTERS; NICKEL CLUSTERS; CHEMISTRY; AMMONIA; DEHYDROGENATION; CHEMISORPTION; HYDROGEN; PRODUCTS; COBALT AB The chemical reactions of isolated clusters of transition metal atoms with small molecules will be reviewed. Reactions of iron, cobalt, and nickel clusters with hydrogen, ammonia, water, and nitrogen will be considered. Experiments which determine the uptake of adsorbate molecules vs. reagent gas pressure provide information on kinetic and equilibrium processes, as well as a measure of the number of adsorbate binding sites on a cluster's surface. More detailed, quantitative determinations of reaction rate constants often show dramatic variation of reactivity with cluster size. Equilibrium studies provide measurements of cluster-adsorbate binding energies. A knowledge of the number of adsorbate binding sites often provides information about cluster geometrical structure. RP RILEY, SJ (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 24 TC 15 Z9 15 U1 1 U2 4 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 101161, 69451 WEINHEIM, GERMANY SN 0005-9021 J9 BER BUNSEN PHYS CHEM JI Ber. Bunsen-Ges. Phys. Chem. Chem. Phys. PD SEP PY 1992 VL 96 IS 9 BP 1104 EP 1109 PG 6 WC Chemistry, Physical SC Chemistry GA JX362 UT WOS:A1992JX36200003 ER PT J AU ARNOLD, GE DAY, LA DUNKER, AK AF ARNOLD, GE DAY, LA DUNKER, AK TI TRYPTOPHAN CONTRIBUTIONS TO THE UNUSUAL CIRCULAR-DICHROISM OF BACTERIOPHAGE-FD SO BIOCHEMISTRY LA English DT Article ID FILAMENTOUS BACTERIAL VIRUSES; LASER RAMAN-SPECTROSCOPY; SOLID-STATE NMR; COAT PROTEIN; PHAGE PENETRATION; DNA PACKING; AMINO-ACIDS; MEMBRANE; IKE; DYNAMICS AB The circular dichroism (CD) spectrum of fd bacteriophage has a deep minimum at 222 nm characteristic of highly alpha-helical protein, but there is a shoulder at 208 nm rather than a minimum, with a 222/208-nm amplitude ratio near 1.5 rather than near 1. Oxidation of fd phage with the tryptophan reagent N-bromosuccinimide (NBS) changes the ratio. In this report, the NBS titration of fd is followed by CD and three other spectroscopies, the results of which yield an explanation of the unusual CD spectrum. Absorbance, fluorescence, and Raman data show the oxidation to have two phases, the first of which involves the destruction of tryptophan and the second, tryptophan and tyrosine. Raman spectra reveal the invariance of an environmentally-sensitive tyrosine Fermi resonance doublet during the first oxidative phase. Raman spectra also show that little or no change of alpha-helicity occurs in the first or second oxidation phase, although very slight changes in the helix parameters might be occurring. Concurrent with the destruction of tryptophan during the first phase is the appearance in CD difference spectra ([theta]NBS-treated fd - [theta]native fd) of positive maxima at 208-210 nm and negative maxima at 224 nm, with crossovers at 217 nm. Enormous difference ellipticities, per oxidized subunit of 50 amino acids, of +490 000 +/- 80 000 deg cm2 dmol-1 at 208 nm and -520 000 +/- 110 000 deg cm2 dmol-1 at 224 nm have been derived from the data. With no apparent change in alpha-helicity, with no loss of other chromophores, and with the constant nature of the tyrosine environments, the entire spectral change has been assigned to tryptophan. Direct stacking of tryptophan-26 (W26) from one subunit upon phenylalanine-45 (F45) from another subunit, with coupling of the electronic transitions of the two chromophores, is proposed as an explanation of the assigned spectrum. C1 WASHINGTON STATE UNIV, DEPT BIOCHEM BIOPHYS, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, DEPT CHEM, PULLMAN, WA 99164 USA. PACIFIC NW LAB, MOLEC SCI RECH CTR, RICHLAND, WA 99352 USA. PUBL HLTH RES INST CITY NEW YORK INC, NEW YORK, NY 10016 USA. FU NIAID NIH HHS [AI09049]; NIGMS NIH HHS [GM 25097, GM 25937] NR 86 TC 75 Z9 75 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 1 PY 1992 VL 31 IS 34 BP 7948 EP 7956 DI 10.1021/bi00149a028 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JL502 UT WOS:A1992JL50200028 PM 1510981 ER PT J AU ANGAWDUGUMA, L MARECEK, J SELTZER, S AF ANGAWDUGUMA, L MARECEK, J SELTZER, S TI THE SYNTHESIS AND ENZYME-CATALYZED ONE-STEP CIS-TRANS DOUBLE ISOMERIZATION OF MONOMETHYL 5-OXO-1,3-HEXADIEN-1-YLPHOSPHONATE, AN ANALOG OF MALEYLACETONE SO BIOORGANIC CHEMISTRY LA English DT Article ID ISOMERASE; SUBSTRATE; GLUTATHIONE; PHOSPHONATE; INHIBITION C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794. NR 25 TC 5 Z9 5 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 0045-2068 J9 BIOORG CHEM JI Bioorganic Chem. PD SEP PY 1992 VL 20 IS 3 BP 213 EP 222 DI 10.1016/0045-2068(92)90014-T PG 10 WC Biochemistry & Molecular Biology; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA JU651 UT WOS:A1992JU65100004 ER PT J AU SHAH, NN PARK, S TAYLOR, RT DROEGE, MW AF SHAH, NN PARK, S TAYLOR, RT DROEGE, MW TI CULTIVATION OF METHYLOSINUS-TRICHOSPORIUM OB3B .3. PRODUCTION OF PARTICULATE METHANE MONOOXYGENASE IN CONTINUOUS CULTURE SO BIOTECHNOLOGY AND BIOENGINEERING LA English DT Article DE METHANOTROPH; PARTICULATE METHANE MONOOXYGENASE; NITROGENASE; CONTINUOUS CULTURE CONDITIONS ID MONO-OXYGENASE; INTRACELLULAR LOCATION; NITROGENASE ACTIVITY; OXIDIZING BACTERIUM; BIODEGRADATION; OXIDATION; TRICHLOROETHYLENE; ACCUMULATION; CELLS; BATCH AB Continuous culture experiments with the obligatory methanotroph, Methylosinus trichosporium OB3b, were conducted to study the whole-cell methane monooxygenase (MMO) and nitrogenase activities in a nitrate minimal salts medium under oxygen-limited conditions with methane as the carbon source. The important variables investigated were the feed medium concentrations of copper and nitrate, CO2 addition, the agitation speed, and the dilution rate. M. trichosporium OB3b required quantitative amounts of copper (2.6 x 10(-4) g Cu/g dry cell wt) for the exclusive production of particulate MMO during continuous culture growth. When the feed medium nitrate concentration was varied in the range of 5-50 mM, the whole-cell specific pMMO activity exhibited a maximum at 40 mM. The elimination of external CO2 gassing decreased pMMO activity by more than 30%. The steady-state cell density increased continuously over a 300-700 rpm range of agitation speed, whereas, the pMMO activity became maximal at 400 rpm. Also, the pMMO activity increased with the dilution rate up to 0.06 h-1 and remained constant thereafter. Maximal continuous pMMO productivity was, thus, achieved in Higgin's medium containing 10-mu-M Cu, 80-mu-M Fe, and 40 mM nitrate with an agitation speed of 500 rpm and a dilution rate of 0.06 h-1. Nitrogenase activity, on the other hand, increased over a feed medium copper concentration of 2-15-mu-M, falling sharply at 20-mu-M, and it exhibited a minimum at 20 mM when the feed medium nitrate concentration was varied. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DIV CHEM SCI,LIVERMORE,CA 94550. NR 24 TC 16 Z9 17 U1 1 U2 8 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3592 J9 BIOTECHNOL BIOENG JI Biotechnol. Bioeng. PD SEP PY 1992 VL 40 IS 6 BP 705 EP 712 DI 10.1002/bit.260400609 PG 8 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA JK032 UT WOS:A1992JK03200008 PM 18601170 ER PT J AU DUKE, EF PAPIKE, JJ LAUL, JC AF DUKE, EF PAPIKE, JJ LAUL, JC TI GEOCHEMISTRY OF A BORON-RICH PERALUMINOUS GRANITE PLUTON - THE CALAMITY PEAK LAYERED GRANITE PEGMATITE COMPLEX, BLACK-HILLS, SOUTH-DAKOTA SO CANADIAN MINERALOGIST LA English DT Article; Proceedings Paper CT WORKSHOP ON THE MINERALOGY, GEOCHEMISTRY AND PETROLOGY OF GRANITIC PEGMATITES CY AUG, 1990 CL UNIV MANITOBA, WINNIPEG, CANADA SP INT GEOL CORRELAT PROGRAM HO UNIV MANITOBA DE GRANITE; PEGMATITE; IGNEOUS LAYERING; PERALUMINOUS; BORON; GEOCHEMISTRY; RARE-EARTH ELEMENTS; TRACE ELEMENT MODELING; BLACK-HILLS; SOUTH-DAKOTA ID RARE-EARTH ELEMENTS; PARTITION-COEFFICIENTS; TRACE-ELEMENTS; FELSIC MAGMAS; HARNEY PEAK; ZONED PEGMATITES; SILICIC MAGMAS; 2 KBAR; MONAZITE; FRACTIONATION AB The Calamity Peak pluton is a small, layered granite-pegmatite intrusive body associated with the Harney Peak Granite in the Black Hills, South Dakota. The pluton is texturally and chemically heterogeneous; it consists predominantly of tourmaline - muscovite - garnet granite and pegmatite, along with minor muscovite - biotite - garnet granite, and includes approximately 400 m of alternating granite and pegmatite, in layers 0.1-2.0 m thick. Pegmatite layers are enriched in perthite whereas granite layers contain relatively more albite and tourmaline so that Na2O/(Na2O+K2O) ranges from 0.37 to 0.91. Along with Na, granite layers are relatively enriched in B, Mg, Ca, Fe, Zn, Zr, REE, Hf, Th, and U, whereas pegmatite layers are relatively enriched in K, As, Rb, Nb, Cs, Ba, Ta, and Pb, and have higher Eu/Eu*. Relative to "primitive" biotite granites that occur in other portions of the Harney Peak Granite, rocks at Calamity Peak are enriched in B (approximately 5 x - 80 x), Na, P, Mn, As, Sb, Cs, and Ta, but depleted in Mg, K, Ca, Sc, Ti, Cr, Fe, Co, Cu, Sr, Y, Zr, Ba, Hf, Pb, Th, U, and all REE except Lu. Depletion in thorium and LREE is attributed to early crystallization and separation of monazite. Enrichment in Na at Calamity Peak and the development of prominent igneous layering are attributed to phase-equilibrium shifts induced by the high B content of the magmas. The overall chemical changes are consistent with derivation of the least fractionated Calamity Peak compositions through 70% fractional crystallization of Harney Peak biotite granites; this agrees with structural evidence that the Calamity Peak pluton formed after much of the main Harney Peak Granite dome had been emplaced. C1 S DAKOTA SCH MINES & TECHNOL, DEPT GEOL & GEOL ENGN, RAPID CITY, SD 57701 USA. UNIV NEW MEXICO, INST METEORIT, ALBUQUERQUE, NM 87131 USA. UNIV NEW MEXICO, DEPT GEOL, ALBUQUERQUE, NM 87131 USA. PACIFIC NW LAB, DIV CHEM TECHNOL, RICHLAND, WA 99352 USA. RP DUKE, EF (reprint author), S DAKOTA SCH MINES & TECHNOL, ENGN & MIN EXPT STN, RAPID CITY, SD 57701 USA. NR 55 TC 30 Z9 31 U1 0 U2 3 PU MINERALOGICAL ASSOC CANADA PI NEPEAN PA CITYVIEW 78087, NEPEAN ON K2G 5W2, CANADA SN 0008-4476 J9 CAN MINERAL JI Can. Mineral. PD SEP PY 1992 VL 30 BP 811 EP 833 PN 3 PG 23 WC Mineralogy SC Mineralogy GA KC528 UT WOS:A1992KC52800022 ER PT J AU HOLLY, EA CRESS, RD AHN, DK ASTON, DA KRISTIANSEN, JJ FELTON, JS AF HOLLY, EA CRESS, RD AHN, DK ASTON, DA KRISTIANSEN, JJ FELTON, JS TI CHARACTERISTICS OF WOMEN BY SMOKING STATUS IN THE SAN-FRANCISCO BAY AREA SO CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION LA English DT Article ID CERVICAL INTRAEPITHELIAL NEOPLASIA; CIGARETTE-SMOKING; UNITED-STATES; UTERINE CERVIX; EX-SMOKERS; CANCER; POPULATION; NONSMOKERS; BEHAVIOR; NICOTINE AB To better understand why smokers are more likely to develop cervical cancer than nonsmokers, we investigated laboratory and demographic differences between the two groups. Women between the ages of 18 and 49 who attended eleven community clinics in the San Francisco Bay Area were studied to investigate differences between smokers and nonsmokers. The 332 smokers and 365 nonsmokers were queried about smoking habits, sexual and reproductive history, and recent diet. Cervical mucus specimens were cultured for yeast, lactobacillus, and other microorganisms. Results showed that white Hispanic women were less likely to smoke than white non-Hispanic women. Smokers, when compared to nonsmokers, consumed larger quantities of coffee, soft drinks, liquor, and beer in the 24 h prior to the interview. Women who smoked were more likely than those who did not smoke to have had first sexual intercourse before age 16, had a greater number of lifetime sexual partners, and were more likely than nonsmokers to have been pregnant. After controlling for number of sexual partners, smokers reported a history of chlamydia, gonorrhea, and/or pelvic inflammatory disease more often than did nonsmokers, and cervical mucus of smokers was more likely than that from nonsmokers to contain greater than 8500 microorganisms/ml. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP HOLLY, EA (reprint author), UNIV CALIF SAN FRANCISCO,SCH MED,DEPT EPIDEMIOL & BIOSTAT,1388 SUTTER ST,SUITE 920,SAN FRANCISCO,CA 94109, USA. FU NCI NIH HHS [CA42440] NR 35 TC 14 Z9 14 U1 1 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 1055-9965 J9 CANCER EPIDEM BIOMAR JI Cancer Epidemiol. Biomarkers Prev. PD SEP-OCT PY 1992 VL 1 IS 6 BP 491 EP 497 PG 7 WC Oncology; Public, Environmental & Occupational Health SC Oncology; Public, Environmental & Occupational Health GA JP118 UT WOS:A1992JP11800012 PM 1302562 ER PT J AU TURTELTAUB, KW VOGEL, JS FRANTZ, CE SHEN, N AF TURTELTAUB, KW VOGEL, JS FRANTZ, CE SHEN, N TI FATE AND DISTRIBUTION OF 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE IN MICE AT A HUMAN DIETARY EQUIVALENT DOSE SO CANCER RESEARCH LA English DT Article ID ACCELERATOR MASS-SPECTROMETRY; COOKED-BEEF; CARCINOGEN 2-AMINO-3,8-DIMETHYLIMIDAZO<4,5-F>QUINOXALINE; FOOD MUTAGEN; METABOLISM; DNA; PHIP; IDENTIFICATION; DISPOSITION; INDUCTION AB 2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is a heterocyclic amine rodent carcinogen that is found at the ppb level in cooked meat. Most laboratory studies are at 10(4)-10(7)-fold greater concentrations than actual ingested human doses. We report the first study of the bioavailability and fate of this heterocyclic amine at a human dietary equivalent dose using the high sensitivity offered by accelerator mass spectrometry. [2-C-14]PhIP was administered to C57BL/6 male mice (41 ng/kg) by gavage. Tissues and excreta were collected over the subsequent 96 h. One hundred % of the administered dose was excreted in urine (90%) and feces (10%) over the length of the study. Absorption of the radiocarbon-tagged PhIP from the gastrointestinal tract was rapid, with radiocarbon levels peaking in the whole blood and urine within 1 h of exposure. Fecal C-14 levels peaked at 12 h. Tissue levels peaked by 3 h with the highest concentrations of radiolabel in the intestine, stomach, and liver, followed by the kidney, pancreas, lung, and spleen. Low levels of C-14 from PhIP (0.01-0.04% of the administered dose) could be detected in the tissues 48-96 h after exposure, possibly due to covalent binding to protein or DNA. The calculated half-life of PhIP at this dose was 1.14 h. This study is the first example of how accelerator mass spectrometry can be used to gather biological information about carcinogenic compounds at environmental levels of exposure. C1 LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECT,LIVERMORE,CA 94550. RP TURTELTAUB, KW (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,L-452,POB 5507,LIVERMORE,CA 94550, USA. FU NCI NIH HHS [CA55861-01] NR 37 TC 48 Z9 48 U1 0 U2 3 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD SEP 1 PY 1992 VL 52 IS 17 BP 4682 EP 4687 PG 6 WC Oncology SC Oncology GA JK679 UT WOS:A1992JK67900017 PM 1511434 ER PT J AU THRALL, BD MANN, DB SMERDON, MJ SPRINGER, DL AF THRALL, BD MANN, DB SMERDON, MJ SPRINGER, DL TI DNA-POLYMERASE, RNA-POLYMERASE AND EXONUCLEASE ACTIVITIES ON A DNA-SEQUENCE MODIFIED BY BENZO[A]PYRENE DIOLEPOXIDE SO CARCINOGENESIS LA English DT Article ID DIOL EPOXIDE; CARCINOGEN BINDING; 3'-5' EXONUCLEASE; INVITRO SYNTHESIS; SHUTTLE VECTOR; HUMAN-CELLS; ADDUCTS; SITES; TRANSCRIPTION; TEMPLATES AB Adducts produced by modification of DNA with benzo[a]pyrene diolepoxide (BPDE) are known to inhibit both DNA and RNA synthesis. This phenomenon has been used as a method for determining the distribution of carcinogen binding within defined DNA sequences. A critical comparison of different enzyme activities on adducted DNA is needed, since different enzymes may process adducted DNA differently. Thus, we compared blocks in DNA polymerase activity with that of an RNA polymerase and with an exonuclease at single base resolution. BPDE adducts blocked the progression of cloned T7 DNA polymerase (Sequenase) in a dose-dependent manner. Although the majority of these blocks were at one base prior to adducted guanines, we also observed some blocks opposite specific guanines, suggesting that in some sequences the polymerase inserted a base opposite the modified guanine. Digestion with T4 DNA polymerase (3' --> 5') exonuclease activity was also blocked in BPDE-adducted DNA; however, fragments produced by blocks in T4 exonuclease migrated two or more bases longer than the corresponding guanine. Mapping of adduct distributions using both Sequenase and T4 exonuclease gave similar results, demonstrating that a long tract of guanines was preferentially modified, and within a polyguanine sequence, the 5' guanines were more heavily modified than the 3' guanines. Transcription of adducted DNA by SP6 RNA polymerase was also inhibited in a dose-dependent manner. However, adducted bases which posed strong blocks to the DNA polymerase were not always strong blocks to the RNA polymerase. Thus, in terms of adduct distribution, Sequenase and T4 exonuclease provided more consistent results than the RNA polymerase, since blockage of the RNA polymerase correlated poorly with guanines. C1 WASHINGTON STATE UNIV, DEPT BIOCHEM & BIOPHYS, PULLMAN, WA 99164 USA. RP THRALL, BD (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, P7-56, BOX 999, RICHLAND, WA 99352 USA. FU NIEHS NIH HHS [ES03720, ES02614] NR 33 TC 31 Z9 31 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0143-3334 J9 CARCINOGENESIS JI Carcinogenesis PD SEP PY 1992 VL 13 IS 9 BP 1529 EP 1534 DI 10.1093/carcin/13.9.1529 PG 6 WC Oncology SC Oncology GA JP547 UT WOS:A1992JP54700007 PM 1327570 ER PT J AU SUGAMA, T CARCIELLO, NR AF SUGAMA, T CARCIELLO, NR TI CARBONATION OF HYDROTHERMALLY TREATED PHOSPHATE-BONDED CALCIUM ALUMINATE CEMENTS SO CEMENT AND CONCRETE RESEARCH LA English DT Article AB To evaluate the potential of phosphate-bonded calcium aluminate cements (PBC) as wet CO2-resistance cementitious materials in geothermal wells, specimens that had been autoclaved at 200-degrees-C or 300-degrees-C were exposed to Na2CO3-laden water at 100-degrees-C or 200-degrees-C. The phase compositions of the hydrothermal reaction products formed in the autoclaved PBC consist mainly of hydroxyapatite (HOAp) and boehmite. The Na2CO3-induced carbonation of autoclaved PBC yielded two different carbonate species, CaCO3 as the major species, and CO32--incorporated HOAp as the minor one. The former species resulted from the carbonation of HOAp and free Ca dissociated from the calcium aluminate reactants; the latter was derived from the substitution of CO32- for OH- in HOAp. However, the rate of CaCO3-related carbonation was very small, suggesting that the PBC can be categorized as a CO2-resistant cement. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 10 TC 11 Z9 11 U1 2 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0008-8846 J9 CEMENT CONCRETE RES JI Cem. Concr. Res. PD SEP PY 1992 VL 22 IS 5 BP 783 EP 792 DI 10.1016/0008-8846(92)90102-2 PG 10 WC Construction & Building Technology; Materials Science, Multidisciplinary SC Construction & Building Technology; Materials Science GA JL512 UT WOS:A1992JL51200008 ER PT J AU KUSMIEREK, JT SINGER, B AF KUSMIEREK, JT SINGER, B TI 1,N-2-ETHENODEOXYGUANOSINE - PROPERTIES AND FORMATION IN CHLOROACETALDEHYDE-TREATED POLYNUCLEOTIDES AND DNA SO CHEMICAL RESEARCH IN TOXICOLOGY LA English DT Article ID ESCHERICHIA-COLI; ADDUCTS; CROTONALDEHYDE; CRUCIFORMS; ADENOSINE; HELIX AB 1,N2-Etheno-2'-deoxyguanosine (1,N2-epsilon-dGuo), not previously reported as a product of chloroacetaldehyde (CAA) reaction, has been synthesized and characterized. Reaction of deoxyguanosine with CAA in dimethylformamide in the presence of K2CO3 led to preparation of pure 1-N2-epsilon-dGuo with 55% yield. pK(a) values are 2.2 and 9.2. The anionic form of the compound exhibits weak but defined fluorescence; the intensity is similar to that of N2,3-etheno-2'-deoxyguanosine (N2,3-epsilon-dGuo) at neutrality. The stability of the glycosyl bond of 1-N2-epsilon-dGuo (tl/2 = 2.3 h at 37-degrees-C, pH 1) is 10-fold greater than of unmodified deoxyguanosine and at least one thousand-fold greater than of isomeric N2,3-epsilon-dGuo. Reaction of CAA with model polynucleotides indicates that hydrogen bonding of guanine residues in the double-stranded structures is, as expected, an important factor in the formation of 1-N2-ethenoguanine. In contrast, the formation of isomeric N2,3-ethenoguanine is relatively independent of whether the DNA is single-or double-stranded. In salmon sperm DNA, reacted with CAA at neutrality, the formation of 1-N2-ethenoguanine could be demonstrated. However, we find the efficiency of formation of this adduct in double-stranded DNA to be lower than that of all other etheno derivatives. C1 LAWRENCE BERKELEY LAB,DONNER LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. POLISH ACAD SCI,INST BIOCHEM & BIOPHYS,PL-02532 WARSAW,POLAND. FU NCI NIH HHS [CA-47723] NR 24 TC 49 Z9 49 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0893-228X J9 CHEM RES TOXICOL JI Chem. Res. Toxicol. PD SEP-OCT PY 1992 VL 5 IS 5 BP 634 EP 638 DI 10.1021/tx00029a007 PG 5 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Toxicology SC Pharmacology & Pharmacy; Chemistry; Toxicology GA JN551 UT WOS:A1992JN55100007 PM 1446002 ER PT J AU LI, DQ SMITH, DC SWANSON, BI FARR, JD PAFFETT, MT HAWLEY, ME AF LI, DQ SMITH, DC SWANSON, BI FARR, JD PAFFETT, MT HAWLEY, ME TI SYNTHESIS AND PROPERTIES OF NOVEL RUTHENIUM THIN-FILM MATERIALS - SELF-ASSEMBLED MULTILAYER APPROACHES SO CHEMISTRY OF MATERIALS LA English DT Article ID LANGMUIR-BLODGETT; GOLD SURFACES; MONOLAYERS; SILICON; SEMICONDUCTOR; ADSORPTION; MOLECULES; LAYERS; TIO2 AB The synthesis and characterization of stable ruthenium thin films via low-temperature, aqueous solution techniques where self-assembled monolayers are employed to enhance adhesion are described. A monolayer of N-[3-(trimethoxysilyl)propyl]ethylenediaminetriacetate (TMPEDTA) was first introduced onto the surface of fused-silica by a self-assembling scheme followed by nonelectrolytic deposition of a ruthenium thin film using Ru(H2O)62+. The metallic Ru thin films have been characterized by Rutherford backscattering (RBS), electron microprobe analysis (EMPA), scanning electron microscopy (SEM), and scanning tunneling microscopy (STM). RBS suggests a typical thickness of 1500 angstrom for these Ru mirror samples, and STM indicates that the surface morphology has 10-25-nm structural domains. In addition, X-ray photoelectron spectroscopy (XPS), secondary ions mass spectroscopy (SIMS), and Auger photoelectron spectroscopy (AES) were carried out to elucidate the chemical compositions of these Ru mirror thin films. XPS, SIMS, and AES indicate that the Ru mirror films mainly contain ruthenium metal with 10-20% concentration of oxygen as the sub-oxide RuO. RP LI, DQ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 27 Z9 29 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD SEP-OCT PY 1992 VL 4 IS 5 BP 1047 EP 1053 DI 10.1021/cm00023a023 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JQ590 UT WOS:A1992JQ59000023 ER PT J AU GEISER, U KUMAR, SK SAVALL, BM HARRIED, SS CARLSON, KD MOBLEY, PR WANG, HH WILLIAMS, JM BOTTO, RE LIANG, W WHANGBO, MH AF GEISER, U KUMAR, SK SAVALL, BM HARRIED, SS CARLSON, KD MOBLEY, PR WANG, HH WILLIAMS, JM BOTTO, RE LIANG, W WHANGBO, MH TI DISCRETE LAYERS OF ORDERED C-60 MOLECULES IN THE COCRYSTAL C60.CH2I2.C6H6 - SYNTHESIS, CRYSTAL-STRUCTURE, AND C-13 NMR PROPERTIES SO CHEMISTRY OF MATERIALS LA English DT Article ID MAGNETIC-RESONANCE SPECTROSCOPY; BOND LENGTHS; SOLID-STATE; C60; BUCKMINSTERFULLERENE; CONFIRMATION; CARBON AB The first crystals containing crystallographically ordered (at room temperature) unmodified fullerene (C60) molecules, with chemical composition C60.CH2I2.C6H6, have been prepared. The fullerene molecules are arranged in novel hexagonally close-packed layers, separated by the solvent components. A monoclinic (space group C2/c) crystal structure of C60.CH2I2.C6H6 was determined at room temperature [lattice parameters: a = 21.239 (7) angstrom, b = 17.403 (4) angstrom, c = 10.106 (2) angstrom, beta = 106.03 (2)-degrees, V = 3590 (2) angstrom3] and at 122 K [a = 21.024 (7) angstrom, b = 17.298 (4) angstrom, c = 10.043 (2) angstrom, beta = 105.93 (2)-degrees, V = 3512 (2) angstrom3]. The ordered nature (on the X-ray time scale) of the compound allows a detailed determination and discussion of the intermolecular interactions between neighboring fullerene molecules as well as between the C60 and the solvent molecules. Solid-state C-13 NMR under MAS shows three distinct resonances for C60, benzene and CH2I2; static NMR measurements set a lower limit for the rate of molecular rotation of C60 on a time scale of tens of microseconds. C1 N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP GEISER, U (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 17 TC 36 Z9 36 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD SEP-OCT PY 1992 VL 4 IS 5 BP 1077 EP 1082 DI 10.1021/cm00023a028 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JQ590 UT WOS:A1992JQ59000028 ER PT J AU ROBINSON, MR EATON, RP HAALAND, DM KOEPP, GW THOMAS, EV STALLARD, BR ROBINSON, PL AF ROBINSON, MR EATON, RP HAALAND, DM KOEPP, GW THOMAS, EV STALLARD, BR ROBINSON, PL TI NONINVASIVE GLUCOSE MONITORING IN DIABETIC-PATIENTS - A PRELIMINARY EVALUATION SO CLINICAL CHEMISTRY LA English DT Article; Proceedings Paper CT 24TH ANNUAL OAK RIDGE CONF ON ADVANCED ANALYTICAL CONCEPTS FOR THE CLINICAL LABORATORY - LESS INVASIVE TECHNOLOGIES : FROM FINGERSTICKS TO IMPLANTABLES CY APR 08-10, 1992 CL SAN DIEGO, CA SP AMER ASSOC CLIN CHEM, ABBOTT LABS, BAXTER DIAGNOST, BECKMAN INSTRUMENTS, DIAGNOST SYST GRP, BOEHRINGER MANNHEIM, EASTMAN KODAK, HYBRITECH, LIFESCAN, DU PONT CO DE MONITORING THERAPY; NEAR-INFRARED SPECTROSCOPY; MULTIVARIATE CALIBRATION ID MULTIVARIATE CALIBRATION; INFRARED-SPECTROSCOPY; BLOOD AB Noninvasive monitoring of blood/tissue glucose concentrations has been successfully accomplished in individual diabetic subjects by using near-infrared (NIR) spectroscopy coupled with chemometric methods. Three different spectrometer configurations were tested: a) a Fourier-transform infrared spectrometer with an indium antimonide detector; b) a grating monochromator equipped with a silicon (Si) array detector, without fiber optics; and c) a grating monochromator equipped with an Si detector, with fiber-optic sampling. NIR spectra were obtained from diabetic subjects by transmission through the finger during a meal-tolerance test. The maximum range of observed plasma glucose concentrations obtained from the blood samples was 2.5-27 mmol/L. The NIR spectra were processed by using the chemometric multivariate calibration methods of partial least squares and principal component regression. The best calibration yielded a cross-validated average absolute error in glucose concentration of 1.1 mmol/L. This predictive ability suggests that noninvasive glucose determinations by NIR/chemometrics is a viable analytical method. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ROBINSON, MR (reprint author), UNIV NEW MEXICO,SCH MED,ALBUQUERQUE,NM 87131, USA. FU NCRR NIH HHS [5M01RR997] NR 13 TC 246 Z9 248 U1 1 U2 18 PU AMER ASSOC CLINICAL CHEMISTRY PI WASHINGTON PA 2101 L STREET NW, SUITE 202, WASHINGTON, DC 20037-1526 SN 0009-9147 J9 CLIN CHEM JI Clin. Chem. PD SEP PY 1992 VL 38 IS 9 BP 1618 EP 1622 PG 5 WC Medical Laboratory Technology SC Medical Laboratory Technology GA JN322 UT WOS:A1992JN32200006 PM 1525990 ER PT J AU OTVOS, JD JEYARAJAH, EJ BENNETT, DW KRAUSS, RM AF OTVOS, JD JEYARAJAH, EJ BENNETT, DW KRAUSS, RM TI DEVELOPMENT OF A PROTON NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPIC METHOD FOR DETERMINING PLASMA-LIPOPROTEIN CONCENTRATIONS AND SUBSPECIES DISTRIBUTIONS FROM A SINGLE, RAPID MEASUREMENT SO CLINICAL CHEMISTRY LA English DT Article; Proceedings Paper CT 24TH ANNUAL OAK RIDGE CONF ON ADVANCED ANALYTICAL CONCEPTS FOR THE CLINICAL LABORATORY - LESS INVASIVE TECHNOLOGIES : FROM FINGERSTICKS TO IMPLANTABLES CY APR 08-10, 1992 CL SAN DIEGO, CA SP AMER ASSOC CLIN CHEM, ABBOTT LABS, BAXTER DIAGNOST, BECKMAN INSTRUMENTS, DIAGNOST SYST GRP, BOEHRINGER MANNHEIM, EASTMAN KODAK, HYBRITECH, LIFESCAN, DU PONT CO ID GRADIENT GEL-ELECTROPHORESIS; CORONARY-ARTERY DISEASE; HIGH-DENSITY; MYOCARDIAL-INFARCTION; HEART-DISEASE; CHOLESTEROL; QUANTIFICATION; SUBFRACTIONS AB We are developing a method for quantifying plasma lipoproteins by proton nuclear magnetic resonance (NMR) spectroscopy that offers advantages over existing clinical methods. We showed that the major lipoproteins have distinct NMR properties sufficient to permit their concentrations to be extracted from a computer lineshape analysis of the plasma lipid methyl resonance envelope (Clin Chem 1991;37:377-86). We have now discovered that the spectra of the subspecies within each lipoprotein class are different enough to influence the composite spectrum of that class and hence the spectrum of whole plasma. By including spectra representative of these subspecies as additional components in the lineshape-fitting analysis, a complete concentration profile of very-low-density, low-density (LDL), and high-density (HDL) lipoproteins plus the subspecies distributions within these classes can be simultaneously generated. A pilot study of 30 plasma samples of widely varied composition demonstrated good agreement between NMR-derived values and lipoprotein lipid concentrations and LDL and HDL subspecies distributions determined by gradient-gel electrophoresis. C1 UNIV WISCONSIN,DEPT CHEM,MILWAUKEE,WI 53201. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP OTVOS, JD (reprint author), N CAROLINA STATE UNIV,DEPT BIOCHEM,BOX 7622,RALEIGH,NC 27695, USA. FU NHLBI NIH HHS [HL43230, HL 18574] NR 25 TC 309 Z9 311 U1 2 U2 9 PU AMER ASSOC CLINICAL CHEMISTRY PI WASHINGTON PA 2101 L STREET NW, SUITE 202, WASHINGTON, DC 20037-1526 SN 0009-9147 J9 CLIN CHEM JI Clin. Chem. PD SEP PY 1992 VL 38 IS 9 BP 1632 EP 1638 PG 7 WC Medical Laboratory Technology SC Medical Laboratory Technology GA JN322 UT WOS:A1992JN32200008 PM 1326420 ER PT J AU LU, DH TRUONG, TN MELISSAS, VS LYNCH, GC LIU, YP GARRETT, BC STECKLER, R ISAACSON, AD RAI, SN HANCOCK, GC LAUDERDALE, JG JOSEPH, T TRUHLAR, DG AF LU, DH TRUONG, TN MELISSAS, VS LYNCH, GC LIU, YP GARRETT, BC STECKLER, R ISAACSON, AD RAI, SN HANCOCK, GC LAUDERDALE, JG JOSEPH, T TRUHLAR, DG TI POLYRATE-4 - A NEW VERSION OF A COMPUTER-PROGRAM FOR THE CALCULATION OF CHEMICAL-REACTION RATES FOR POLYATOMICS SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article DE CHEMICAL REACTION RATES; ACTIVATION ENERGY; STATIONARY-POINT ANALYSIS; REACTION PATH; VARIATIONAL TRANSITION STATE THEORY; SMALL-CURVATURE TUNNELING; LARGE-CURVATURE TUNNELING; KINETICS; SURFACE SCIENCE ID TRANSITION-STATE-THEORY; CURVATURE TUNNELING APPROXIMATION; VIBRATIONAL PARTITION-FUNCTION; QUANTAL REACTION PROBABILITIES; HINDERED INTERNAL-ROTATION; POTENTIAL-ENERGY SURFACE; REACTION-PATH CURVATURE; 3 COLLINEAR REACTIONS; RATE CONSTANTS; DISSOCIATIVE CHEMISORPTION AB POLYRATE is a computer program for the calculation of chemical reaction rates of polyatomic species (and also atoms and diatoms as special cases). Version 1.1 was submitted to the CPC Program Library in 1987, and since that time we have considerably improved the program and made it more portable, and we have added several new capabilities, resulting in the present improved version 4. The methods used are variational or conventional transition state theory and multidimensional semiclassical adiabatic and large-curvature approximations for tunneling and nonclassical reflection. Rate constants may be calculated for canonical or microcanonical ensembles or for specific vibrational states of selected modes with translational, rotational, and other vibrational modes treated thermally. Bimolecular and unimolecular reactions and gas-phase, solid-state, and gas-solid interface reactions are all included. Potential energy surfaces may be global analytic functions OT impliCit functions defined by interpolation from input energies, gradients, and force constants (Hessian matrices) at selected points on a reaction path. The program calculates reaction paths by the Euler, Euler stabilization, or Page-McIver methods. Variational transition states are optimized from among a one-parameter sequence of generalized transition states orthogonal to the reaction path. Tunneling probabilities are calculated by numerical quadrature, using either the centrifugal-dominant-small-curvature approximation, the large-curvature-version-3 approximation, and/or methods that were available earlier. In the large curvature case the tunneling probabilities may be summed over final vibrational states for exoergic reactions or initial vibrational states for endoergic reactions. C1 UNIV MINNESOTA, DEPT CHEM, MINNEAPOLIS, MN 55455 USA. UNIV MINNESOTA, INST SUPERCOM, MINNEAPOLIS, MN 55455 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. SAN DIEGO SUPERCOMP CTR, SAN DIEGO, CA 92138 USA. MIAMI UNIV, DEPT CHEM, OXFORD, OH 45056 USA. RI Garrett, Bruce/F-8516-2011; Truhlar, Donald/G-7076-2015 OI Truhlar, Donald/0000-0002-7742-7294 NR 62 TC 445 Z9 452 U1 5 U2 25 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD SEP PY 1992 VL 71 IS 3 BP 235 EP 262 DI 10.1016/0010-4655(92)90012-N PG 28 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JR790 UT WOS:A1992JR79000004 ER PT J AU KANSA, EJ AF KANSA, EJ TI A STRICTLY CONSERVATIVE SPATIAL APPROXIMATION SCHEME FOR THE GOVERNING ENGINEERING AND PHYSICS EQUATIONS OVER IRREGULAR REGIONS AND INHOMOGENEOUSLY SCATTERED NODES SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article ID COMPUTATIONAL FLUID-DYNAMICS; INTERPOLATION; MULTIQUADRICS AB This paper reports the progress made in multiquadrics (MQ) as a spatial approximation scheme for systems of governing equations of engineering and physics by minimizing the spatial truncation errors without excessive refinement. Although MQ is defined over the general n-dimensional real space, this paper is limited to two spatial dimensions defined over a general non-convex irregular region containing inhomogeneously scattered nodes. We have developed a strictly conservative interpolation scheme over such irregular regions from which the partial derivative estimates are obtained. In addition, we developed a non-iterative scheme to be used with domain decomposition to ensure derivative continuity over contiguous regions. Jump discontinuities for shock and material interfaces are likewise treated by appropriate modification of the algorithm. We have compared the relative errors of the derivative estimates defined over an irregular region consisting of inhomogeneously scattered nodes obtained by the MQ and Voronoi mesh schemes. The MQ relative errors of the derivative estimates are three orders of magnitude better than those obtained from the Voronoi mesh method. (In our previous papers, we have shown that MQ is superior in its derivative estimates over regular gridded regions.) We have also used MQ to estimate derivatives within a very narrow "shock" region with similar excellent results. While comparing spatial approximation schemes for PDE's, we found the MQ results to be superior in accuracy and were calculated by far fewer operations than standard finite difference schemes. Other authors have likewise used MQ successfully to solve integral equations. RP KANSA, EJ (reprint author), LAWRENCE LIVERMORE NATL LAB,L-200,LIVERMORE,CA 94551, USA. NR 25 TC 7 Z9 7 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD SEP PY 1992 VL 24 IS 5-6 BP 169 EP 190 DI 10.1016/0898-1221(92)90047-L PG 22 WC Mathematics, Applied SC Mathematics GA JF269 UT WOS:A1992JF26900012 ER PT J AU HWANG, YK AHUJA, N AF HWANG, YK AHUJA, N TI GROSS MOTION PLANNING - A SURVEY SO COMPUTING SURVEYS LA English DT Review DE COLLISION DETECTION; COMPUTATIONAL GEOMETRY; IMPLEMENTATION; MOTION PLANNING; OBSTACLE AVOIDANCE; PATH PLANNING; SPATIAL REPRESENTATION ID AMIDST POLYGONAL BARRIERS; PIANO MOVERS PROBLEM; FREE-SPACE; ROBOTIC MANIPULATORS; VORONOI DIAGRAMS; ALGORITHM; PATHS; TIME; NAVIGATION; OBSTACLES AB Motion planning is one of the most important areas of robotics research. The complexity of the motion-planning problem has hindered the development of practical algorithms. This paper surveys the work on gross-motion planning, including motion planners for point robots, rigid robots, and manipulators in stationary, time-varying, constrained, and movable-object environments. The general issues in motion planning are explained. Recent approaches and their performances are briefly described, and possible future research directions are discussed. C1 UNIV ILLINOIS,BECKMAN INST,URBANA,IL 61801. UNIV ILLINOIS,COORDINATED SCI LAB,URBANA,IL 61801. RP HWANG, YK (reprint author), SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185, USA. NR 179 TC 229 Z9 230 U1 2 U2 19 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0360-0300 J9 COMPUT SURV PD SEP PY 1992 VL 24 IS 3 BP 219 EP 291 PG 73 WC Computer Science, Theory & Methods SC Computer Science GA KC842 UT WOS:A1992KC84200001 ER PT J AU SHADID, JN TUMINARO, RS AF SHADID, JN TUMINARO, RS TI SPARSE ITERATIVE ALGORITHM SOFTWARE FOR LARGE-SCALE MIMD MACHINES - AN INITIAL DISCUSSION AND IMPLEMENTATION SO CONCURRENCY-PRACTICE AND EXPERIENCE LA English DT Article ID NONSYMMETRIC LINEAR-SYSTEMS; HYPERCUBE AB The parallelization of sophisticated applications has dramatically increased in recent years. As machine capabilities rise, greater emphasis on modeling complex phenomena can be expected. Many of these applications require the solution of large sparse matrix equations which approximate systems of partial differential equations (PDEs). Therefore we consider parallel iterative solvers for large sparse non-symmetric systems and issues related to parallel sparse matrix software We describe a collection of parallel iterative solvers which use a distributed sparse matrix format that facilitates the interface between specific applications and a variety of Krylov subspace techniques and multigrid methods. These methods have been used to solve a number of linear and non-linear PDE problems on a 1024-processor NCUBE 2 hypercube. Over 1 Gflop sustained computation rates are achieved with many of these solvers, demonstrating that high performance can be attained even when using sparse matrix data structures. C1 SANDIA NATL LABS,DEPT PARALLEL COMPUTAT SCI,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DEPT APPL & NUMER MATH,ALBUQUERQUE,NM 87185. NR 27 TC 10 Z9 11 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1040-3108 J9 CONCURRENCY-PRACT EX JI Concurrency-Pract. Exp. PD SEP PY 1992 VL 4 IS 6 BP 481 EP 497 DI 10.1002/cpe.4330040605 PG 17 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA JN611 UT WOS:A1992JN61100004 ER PT J AU MEFFE, GK AF MEFFE, GK TI TECHNOARROGANCE AND HALFWAY TECHNOLOGIES - SALMON HATCHERIES ON THE PACIFIC COAST OF NORTH-AMERICA SO CONSERVATION BIOLOGY LA English DT Article AB Humankind bas adopted an arrogant and ultimately self-defeating attitude toward nature that places technological mastery over nature at the forefront of our approach to many environmental problems. This "techno-arrogance" fails to recognize limitations on, and ramifications of, attempted control of nature An example of techno-arrogance is the flawed attempt to recover Pacific salmonid fisheries through technological application in the form of hatcheries. Countless salmon stocks have declined precipitously over the last century as a result of over fishing and widespread habitat destruction A central feature of recovery efforts has been to build many hatcheries to produce large quantities of fish to restock streams. This approach addresses the symptoms but not the causes of the declines (an example of a halfway technology), because the habitats remain largely unsuitable for salmon. There are at least six reasons why the hatchery approach will ultimately fail: (1) data demonstrate that hatcheries are not solving the problem-salmon continue to decline despite decades of hatchery production; (2) hatcheries are costly to run, and divert resources from other efforts; such as habitat restoration; (3) hatcheries are not sustainable in the long term requiring continual input of money and energy; (4) hatcheries are a genetically unsound approach to management that can adversely affect wild populations; (5) hatchery production leads to increased harvest of declining wild populations of salmon; and (6) hatcheries conceal from the public the truth of real salmon decline. I recommend that salmonid management turn from the symptoms to the causes of decline. Over harvest and habitat destruction must be directly addressed in a major, landscape-level effort, on a scale comparable to the hatchery program, if salmonid fisheries are to remain a part of the ecological, recreational, commercial, and asthetic arenas in the long term. RP MEFFE, GK (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 0 TC 110 Z9 112 U1 1 U2 15 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 SN 0888-8892 J9 CONSERV BIOL JI Conserv. Biol. PD SEP PY 1992 VL 6 IS 3 BP 350 EP 354 DI 10.1046/j.1523-1739.1992.06030350.x PG 5 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA JM322 UT WOS:A1992JM32200007 ER PT J AU MILONNI, PW SHIH, ML AF MILONNI, PW SHIH, ML TI CASIMIR FORCES SO CONTEMPORARY PHYSICS LA English DT Review ID LONG-RANGE POTENTIALS; VACUUM; ENERGY; WORMHOLES; SURFACE; PLATES; STRESS; LIGHT AB Casimir effects are relevant to areas as diverse as quantum field theory, cosmology, high-precision spectroscopy of Rydberg atoms, forces between dielectrics and conductors, atom-surface interactions, and the wetting of surfaces, amongst many others. In this article the basic ideas and results are reviewed. The emphasis is on the basic physics of Casimir forces, but some applications are discussed RP MILONNI, PW (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 65 TC 38 Z9 38 U1 1 U2 7 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0010-7514 J9 CONTEMP PHYS JI Contemp. Phys. PD SEP-OCT PY 1992 VL 33 IS 5 BP 313 EP 322 DI 10.1080/00107519208223981 PG 10 WC Physics, Multidisciplinary SC Physics GA LG182 UT WOS:A1992LG18200002 ER PT J AU WHITE, JD KISNER, RA BRITTAIN, CR JAMSHIDI, M AF WHITE, JD KISNER, RA BRITTAIN, CR JAMSHIDI, M TI SPECIAL ISSUE ON ADVANCED CONTROL ARCHITECTURES FOR NUCLEAR-REACTORS SO CONTROL-THEORY AND ADVANCED TECHNOLOGY LA English DT Editorial Material C1 SPECTRUM MED TECHNOL,KNOXVILLE,TN 37931. OAK RIDGE NATL LAB,ADV CONTROLS PROGRAM,OAK RIDGE,TN 37831. UNIV NEW MEXICO,DEPT ELECT ENGN,CAD LAB INTELLIGENT & ROBOT SYST,ALBUQUERQUE,NM 87131. RP WHITE, JD (reprint author), OAK RIDGE NATL LAB,LIGHT WATER REACTOR & LIQUID REACTOR PROGRAMS,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU MITA PRESS PI TOKYO PA OCHANOMIZU CENTER BLDG 2-12 HONGO-3 BUNKYO-KU, TOKYO 113, JAPAN SN 0911-0704 J9 CONTR-THEOR ADV TECH JI Control-Theory Adv. Technol. PD SEP PY 1992 VL 8 IS 3 BP 379 EP 385 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA KD796 UT WOS:A1992KD79600001 ER PT J AU WHITE, JD AF WHITE, JD TI NUCLEAR-POWER-PLANT AUTOMATION ISSUES SO CONTROL-THEORY AND ADVANCED TECHNOLOGY LA English DT Article DE NUCLEAR REACTOR; CONTROL; INSTRUMENT; COMPUTER AB Nuclear power plants are less automated than many industrial processes. Presently, the controls and instrumentation technology utilized in U.S. plants is more than twenty years old. The evolutionary trend in the U.S., Europe and Japan is toward incorporation of more modern technology and automation. The author discusses issues which are currently being faced by designers of computer-based protection, control and information systems for nuclear power plants. These issues are grouped into categories of human-machine roles and interfaces, control strategies, hardware and software design considerations, verification and validation, and life cycle maintenance. RP WHITE, JD (reprint author), OAK RIDGE NATL LAB,BLDG 3500,MS 6009,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU MITA PRESS PI TOKYO PA OCHANOMIZU CENTER BLDG 2-12 HONGO-3 BUNKYO-KU, TOKYO 113, JAPAN SN 0911-0704 J9 CONTR-THEOR ADV TECH JI Control-Theory Adv. Technol. PD SEP PY 1992 VL 8 IS 3 BP 389 EP 403 PG 15 WC Automation & Control Systems; Engineering, Electrical & Electronic; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA KD796 UT WOS:A1992KD79600003 ER PT J AU BERKAN, RC UPADHYAYA, BR KISNER, RA FITZPATRICK, B AF BERKAN, RC UPADHYAYA, BR KISNER, RA FITZPATRICK, B TI INVERSE DYNAMICS PARADIGM - ADAPTIVE NONLINEAR CONTROL AND IDENTIFICATION OF LARGE-SCALE POWER-SYSTEMS SO CONTROL-THEORY AND ADVANCED TECHNOLOGY LA English DT Article DE INVERSE DYNAMICS; ADAPTIVE CONTROL; ARTIFICIAL INTELLIGENCE; NUCLEAR REACTOR CONTROL AB The development of the inverse dynamics control paradigm is presented. The theory is based on the foundation of standard inverse-problems methods of mathematics. The closed-form control solution allows heuristic interpretations at the design and implementation stages. Accordingly, an adaptive control feature may be incorporated if the system under consideration is complex and includes uncertainties. The primary objective has been to develop a nonlinear control strategy that is simple to implement and is capable of providing robust control in case of severe nonlinearities and uncertainties in the plant. Using validated nonlinear models, the effectiveness of the approach in application to nuclear reactors had been previously verified. The nonlinear control law was also shown to be capable of full-envelope automated startup operation in nuclear reactors without operator intervention. A collection of applications is briefly presented in this paper. The algebraic form of the control law shows potential for simple hardware implementation. C1 UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,I&C DIV,OAK RIDGE,TN. SPECTRUM MED TECHNOL,KNOXVILLE,TN 37931. UNIV TENNESSEE,DEPT MATH,KNOXVILLE,TN 37996. RP BERKAN, RC (reprint author), H&R TECH ASSOCIATES INC,OAK RIDGE,TN, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU MITA PRESS PI TOKYO PA OCHANOMIZU CENTER BLDG 2-12 HONGO-3 BUNKYO-KU, TOKYO 113, JAPAN SN 0911-0704 J9 CONTR-THEOR ADV TECH JI Control-Theory Adv. Technol. PD SEP PY 1992 VL 8 IS 3 BP 465 EP 477 PG 13 WC Automation & Control Systems; Engineering, Electrical & Electronic; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA KD796 UT WOS:A1992KD79600007 ER PT J AU MARCHLEUBA, C ABDALLA, M FORD, CE GUIMARAES, L AF MARCHLEUBA, C ABDALLA, M FORD, CE GUIMARAES, L TI A HYBRID FUZZY-PI ADAPTIVE-CONTROL FOR U-TUBE STEAM-GENERATORS SO CONTROL-THEORY AND ADVANCED TECHNOLOGY LA English DT Article DE WATER LEVEL CONTROLLER; FUZZY LOGIC; U-TUBE STEAM GENERATOR; ADAPTIVE CONTROL; GAIN SCHEDULING; OBJECT-ORIENTED PROGRAMMING AB This paper presents an adaptive algorithm using fuzzy logic to control the water level of a U-tube steam generator (UTSG). The algorithm improves the response of a standard proportional-integral (PI) controller to nonminimum-phase perturbations by combining fuzzy-logic and gain-scheduling techniques. The new automatic controller can operate under the full range of operating conditions. The level error signal is modified by two fuzzy-logic circuits and a gain-scheduling table before reaching the PI module. Variations in steam pressure and feedwater temperature, which can induce out-of-phase disturbances to the system, are taken into account by the fuzzy-logic modules. The algorithm has been tested by using a simulation of a Westinghouse Electrical Corporation UTSG. C1 OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. RP MARCHLEUBA, C (reprint author), INITEC,INSTRUMENTAC & CONTROL,PADILLA 17,E-28006 MADRID,SPAIN. NR 9 TC 4 Z9 4 U1 0 U2 0 PU MITA PRESS PI TOKYO PA OCHANOMIZU CENTER BLDG 2-12 HONGO-3 BUNKYO-KU, TOKYO 113, JAPAN SN 0911-0704 J9 CONTR-THEOR ADV TECH JI Control-Theory Adv. Technol. PD SEP PY 1992 VL 8 IS 3 BP 567 EP 575 PG 9 WC Automation & Control Systems; Engineering, Electrical & Electronic; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA KD796 UT WOS:A1992KD79600013 ER PT J AU WATSON, SW MADSEN, BW AF WATSON, SW MADSEN, BW TI APPLICABILITY OF REFERENCE ELECTRODE TYPES IN TRANSIENT ELECTROCHEMICAL EXPERIMENTS SO CORROSION LA English DT Article DE CONDUCTIVITY, DUMMY CIRCUITS; HABER TIP; IR DROP COMPENSATION; LUGGIN ASSEMBLY AB The high impedance associated with many reference electrodes can complicate transient electrochemical experiments. To overcome some of these difficulties, some researchers have adopted a dual reference electrode system consisting of an inert wire such as platinum (Pt) coupled to a capacitor in parallel with a reference electrode such as a saturated calomel electrode (SCE). Transient studies were carried out to determine how the types of reference electrode affected the IR drop compensation when a current interrupt technique was used. The placement of the Pt wire, coupled in parallel to the 0.1 muf capacitor in the Luggin probe-Haber tip assembly, made a difference in the transient studies, especially for dilute sulfuric acid of low conductivity. When the Pt wire was placed at the tip of the Luggin probe, the high impedance problem was eliminated. On the other hand, when the Pt wire resided in the beaker with the SCE reference, the problem remained. Dummy electrical circuits were assembled to simulate the transient studies. By using these dummy circuits, it was determined that the high resistance of the Haber portion of the Luggin assembly accounted for differences observed with placement of the Pt wire. For these transient experiments, the dual electrode was determined to be the best overall reference electrode for studying solutions over a wide conductivity range. The dual electrode overcomes the high-impedance problem of the SCE and the problem of potential drift of a pseudo Pt reference electrode. RP WATSON, SW (reprint author), US BUR MINES,ALBANY RES CTR,1450 QUEEN AVE SW,ALBANY,OR 97321, USA. NR 5 TC 9 Z9 9 U1 0 U2 4 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD SEP PY 1992 VL 48 IS 9 BP 727 EP 733 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JT802 UT WOS:A1992JT80200003 ER PT J AU JONES, RH FRIESEL, MA AF JONES, RH FRIESEL, MA TI ACOUSTIC-EMISSION DURING PITTING AND TRANSGRANULAR CRACK INITIATION IN TYPE-304 STAINLESS-STEEL SO CORROSION LA English DT Article DE ACOUSTIC MONITORING; CRACK INITIATION ID CORROSION AB The acoustic emission (AE) response of a low-carbon type 304 stainless steel (SS) (UNS S30400) during pitting and transgranular stress corrosion cracking (TGSCC) has been measured. Tests were conducted in 0.01 and 1 M NaCl with the pH adjusted to 1 with HCl at potentials of -380 mV and 0 mV (SCE) for no applied stress and with a stress equal to 75% of the yield strength of the material. Acoustic emission signals were detected using piezoelectric sensors attached to each end of cylindrical samples. The two detectors allowed the discrimination between signals generated within the sample gauge section from those generated elsewhere. The AE activity during pitting corrosion was significant, it was concluded that the AE signals did not emanate from cracking or dislocation activity. Applied stress exhibited an inconsistent effect on the AE rate, but it did shorten the transition time from low to high AE rates. The AE rate increased slightly with increasing sample current in 0.01 M NaCl and with increasing corrosion rate, resulting from an increase in salt concentration from 0.01 to 1 M NaCl. Hydrogen and oxygen gas bubble formation was not observed on the samples, and the electrochemical conditions were not consistent with their formation; therefore, AE from bubble formation was ruled out. It was suggested that rupture of an oxide or salt cap during pit growth is a possible source of the AE. If such a process did occur, the total AE/pit ratio suggests that only 1 to 3% of the pits were involved. Considering the larger pits are more apt to produce an oxide cap, the pit size distribution suggests pits larger than approximately 10 mum were acoustically active. RP JONES, RH (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 21 TC 38 Z9 40 U1 2 U2 8 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD SEP PY 1992 VL 48 IS 9 BP 751 EP 758 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JT802 UT WOS:A1992JT80200006 ER PT J AU WALLACE, DWR SCHLOSSER, P KRYSELL, M BONISCH, G AF WALLACE, DWR SCHLOSSER, P KRYSELL, M BONISCH, G TI HALOCARBON RATIO AND TRITIUM HE-3 DATING OF WATER MASSES IN THE NANSEN BASIN, ARCTIC-OCEAN SO DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID ATMOSPHERIC LIFETIME EXPERIMENT; OXYGEN UTILIZATION; VENTILATION; RATES; SEA; CHLOROFLUOROMETHANES; ATLANTIC; GREENLAND; EXCHANGE AB Three separate tracer ratio-based water mass ages (CCl4/F11, tritium/He-3 and F11/F12) are calculated for the 1987 oceanographic section by R.V. Polarstern across the Nansen Basin, Arctic Ocean. The CCl4/F11 ratio ages are shown to be in good agreement with the apparent tritium/He-3 ages throughout the age range studied (5-30 years) and with F11/F12 ages in the age range for which such comparisons can be made (16-30 years). A simple box model (integrated to 1987) shows that for CCl4/F11 and tritium/He-3 ages less than 12 years, the apparent ages should be close to the mean age of the water sampled. The distribution of the tracer ages is discussed with respect to the circulation of water masses in the Nansen Basin. C1 COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964. COLUMBIA UNIV,DEPT GEOL,PALISADES,NY 10964. CHALMERS UNIV TECHNOL,DEPT ANALYT & MARINE CHEM,S-41296 GOTHENBURG,SWEDEN. GOTHENBURG UNIV,S-41296 GOTHENBURG,SWEDEN. UNIV HEIDELBERG,INST UMWELTPHYS,W-6900 HEIDELBERG,GERMANY. RP WALLACE, DWR (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. RI Schlosser, Peter/C-6416-2012 OI Schlosser, Peter/0000-0002-6514-4203 NR 39 TC 30 Z9 31 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0198-0149 J9 DEEP-SEA RES PD SEP PY 1992 VL 39 IS 2A SU S BP S435 EP S458 DI 10.1016/S0198-0149(06)80015-4 PG 24 WC Oceanography SC Oceanography GA JU309 UT WOS:A1992JU30900003 ER PT J AU HADDER, GR AF HADDER, GR TI FUTURE REFINING IMPACTS OF THE CLEAN-AIR ACT AMENDMENTS OF 1990 SO ENERGY LA English DT Article AB An assessment of the future refining impacts of the U.S. Clean Air Act Amendments of 1990 has been performed with the Navy Mobility Fuels Forecasting System. In 1992, the Environmental Protection Agency (EPA) should finalize precise requirements for Phase I reformulated gasoline, to be produced in 1995-1999. EPA requirements for Phase II reformulated gasoline, to be produced after 1999, will not be established until 1993. The assessment of refining impacts assumes that reformulated gasoline with likely Phase I specifications will be produced for markets projected for the year 2000. The assessment suggests that gasoline reformulation costs in U.S. coastal and near-coastal refining regions could be 3.5 to 5.6 cents per gallon (1989 U.S. currency). The relative value of MTBE is the most important determinant of the reformulation cost. For mileage equivalent to one gallon of conventional gasoline, the regional total added costs (including reformulation costs) for reformulated gasoline could be 5.2 to 7.6 cents. In blending reformulated gasolines, the reduction of butane for lower Reid vapor pressure and the reduction of reformate for lower aromatics are generally compensated by increased percentages of alkylate and/or straight run naphthas. Relatively larger refinery process capacity additions are required for butane isomerization, alkylation, aromatics recovery, and distillate hydrotreating. RP HADDER, GR (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 27 TC 4 Z9 4 U1 2 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD SEP PY 1992 VL 17 IS 9 BP 857 EP 868 DI 10.1016/0360-5442(92)90103-7 PG 12 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA JC645 UT WOS:A1992JC64500005 ER PT J AU MARR, WW WALSH, WJ SYMONS, PC AF MARR, WW WALSH, WJ SYMONS, PC TI MODELING BATTERY PERFORMANCE IN ELECTRIC VEHICLE APPLICATIONS SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE ELECTRIC VEHICLES; BATTERY PERFORMANCE; MICROCOMPUTERS; SOFTWARE; MODELING AB An interactive microcomputer software package, DIANE 2.1, has been developed for the analysis of battery performance in electric vehicle (EV) applications. The principal objective of this software package is to enable the prediction of EV performance on the basis of laboratory test data for batteries. The model provides a second-by-second simulation of battery voltage and current for any specified velocity/time or power/time profile. The capacity of the battery is modeled by an algorithm that relates the battery voltage to the withdrawn current, taking into account the effect of battery depth-of-discharge (DOD). Because of the lack of test data and other constraints, the current version deals only with vehicles using "fresh" batteries, with or without regenerative braking. Deterioration of battery capability due to aging can presently be simulated with user-input parameters accounting for an increase of effective internal resistance and/or a decrease of cell no-load voltage. DIANE 2.1 is written in the FORTRAN language for use on IBM-compatible microcomputers. RP MARR, WW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD SEP PY 1992 VL 33 IS 9 BP 843 EP 847 DI 10.1016/0196-8904(92)90012-L PG 5 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA JC644 UT WOS:A1992JC64400003 ER PT J AU MARR, WW WALSH, WJ AF MARR, WW WALSH, WJ TI LIFE-CYCLE COST EVALUATIONS OF ELECTRIC HYBRID VEHICLES SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE COST; ELECTRIC VEHICLES; HYBRID VEHICLES; MICROCOMPUTERS; SOFTWARE; OPTIMIZATION; DESIGN; RECHARGEABLE BATTERIES AB An interactive microcomputer software package, MARVEL, has been developed for analyzing battery/heat engine/hybrid vehicle systems. It enables least-life-cycle-cost analyses that identify the combination of battery and heat engine characteristics for different vehicle types and missions. Key features of MARVEL include extensive modeling of the interrelationships among battery parameters and a consistent design effort to avoid premature specification of any parameter. The software package includes default data sets for various vehicle designs, driving profiles, and battery technologies. It can be used to analyze a pure electric vehicle, a pure heat engine vehicle, or a hybrid vehicle that employs both batteries and a heat engine. MARVEL is written in PL/I language for use on IBM-compatible microcomputers. RP MARR, WW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 5 Z9 5 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD SEP PY 1992 VL 33 IS 9 BP 849 EP 853 DI 10.1016/0196-8904(92)90013-M PG 5 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA JC644 UT WOS:A1992JC64400004 ER PT J AU FRANZ, JA GARCIA, R LINEHAN, JC LOVE, GD SNAPE, CE AF FRANZ, JA GARCIA, R LINEHAN, JC LOVE, GD SNAPE, CE TI SINGLE-PULSE EXCITATION C-13 NMR MEASUREMENTS ON THE ARGONNE PREMIUM COAL SAMPLES SO ENERGY & FUELS LA English DT Article ID SOLID-STATE NMR; SPECTROSCOPY; RELIABILITY AB In view of the results of this study and the well-documented inherent problems with cross-polarization (CP) C-13 NMR concerning quantification for coals, it is now clear that the more time-consuming single-pulse excitation (SPE) or Bloch decay measurements are essential for obtaining aromaticities and other carbon skeletal parameters for coals. SPE C-13 NMR has been carried out on the Argonne Premium Coal Samples at both a low and a high field strength (25 and 75 MHz, respectively), high-speed magic angle spinning (13 kHz) being used to suppress spinning sidebands at the higher field. Aromaticity values measured by SPE at low and high field were generally in excellent agreement and were consistently higher than those from CP, the greatest differences being found for the two low-rank coals in the Argonne suite. The use of tetrakis(trimethylsilyl)silane as an internal standard in the low-field measurements indicated that, in general, over 75% of the carbon in the coals is typically observed by SPE. C1 US DOE,PACIFIC NW LAB,RICHLAND,WA 99352. RP FRANZ, JA (reprint author), UNIV STRATHCLYDE,DEPT PURE & APPL CHEM,THOMAS GRAHAM BLDG,295 CATHEDRAL ST,GLASGOW G1 1XL,SCOTLAND. RI Garcia, Roberto/J-6919-2014 NR 18 TC 70 Z9 71 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD SEP-OCT PY 1992 VL 6 IS 5 BP 598 EP 602 DI 10.1021/ef00035a009 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA JP742 UT WOS:A1992JP74200009 ER PT J AU RAYNER, S AF RAYNER, S TI HUMAN DIMENSIONS OF GLOBAL CHANGE SO ENVIRONMENT LA English DT Editorial Material RP RAYNER, S (reprint author), PACIFIC NW LAB, PROGRAM GLOBAL ENVIRONM MANAGEMENT STUDIES, RICHLAND, WA 99352 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0013-9157 J9 ENVIRONMENT JI Environment PD SEP PY 1992 VL 34 IS 7 BP 3 EP 4 PG 2 WC Environmental Sciences; Environmental Studies SC Environmental Sciences & Ecology GA JK366 UT WOS:A1992JK36600003 ER PT J AU TONN, BE SCHAFFHAUSER, A AF TONN, BE SCHAFFHAUSER, A TI TOWARDS A MORE GENERAL THEORETICAL AND MATHEMATICAL-MODEL OF PROBABILITY FOR POLICY ANALYSIS SO ENVIRONMENT AND PLANNING A LA English DT Article ID UNCERTAINTY AB Uncertainty pervades policy analysis in ways that transcend classical concepts of probability. To benefit policy analysis, the concept of probability must be considerably broadened. It is argued that probability can be conceptualized with respect to the characteristics of policy problems that produce inherent uncertainty. Problems that encompass uncertainty can be characterized according to their: (1) fundamental requirements, for example forecasting, knowledge creation, fact establishment; (2) system properties such as disorderly versus orderly systems; (3) problem-solution strategy, for example subjective judgement, model-based analysis, data analysis; (4) problem-solution data requirements-from numerous and hard-to-measure variables to few and easy-to-measure variables, and (5) problem-solution frame-ranging from unbounded solution spaces to small and discrete solution spaces. The theory of lower probability is presented as a generalization of classical additive probability that can handle this generalized conceptualization of probability. Information-theoretic methods for integrating the two generalizations of probability are considered. C1 UNIV ROCHESTER,ROCHESTER,NY 14627. RP TONN, BE (reprint author), OAK RIDGE NATL LAB,POLICY ANAL SYST GRP,OAK RIDGE,TN 37831, USA. NR 66 TC 0 Z9 0 U1 0 U2 1 PU PION LTD PI LONDON PA 207 BRONDESBURY PARK, LONDON, ENGLAND NW2 5JN SN 0308-518X J9 ENVIRON PLANN A JI Environ. Plan. A PD SEP PY 1992 VL 24 IS 9 BP 1337 EP 1353 DI 10.1068/a241337 PG 17 WC Environmental Studies; Geography SC Environmental Sciences & Ecology; Geography GA JU188 UT WOS:A1992JU18800009 ER PT J AU BONNEFOUS, YC GADGLL, AJ FISK, WJ PRILL, RJ NEMATOLLAHL, AR AF BONNEFOUS, YC GADGLL, AJ FISK, WJ PRILL, RJ NEMATOLLAHL, AR TI FIELD-STUDY AND NUMERICAL-SIMULATION OF SUBSLAB VENTILATION SYSTEMS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article AB The effectiveness of the technique of subslab ventilation (SSV) for limiting radon entry into basements was investigated through complementary experimentation and numerical modeling. Subslab pressure fields resulting from SSV were measured in six well-characterized basements, each with a different combination of soil and aggregate permeability. The relationship between air velocity and pressure gradient was measured in the laboratory for the three types of aggregate installed beneath the basement slabs. A new numerical model of SSV was developed and verified with the field data. This model simulates non-Darcy flow in the aggregate. We demonstrate that non-Darcy effects significantly impact SSV performance. Field data and numerical simulations indicate that increasing the aggregate permeability within the investigated range of 2 X 10-(8)-3 X 10(-7) m2 substantially improves the extension of the subslab pressure field due to SSV operation. Sealing of cracks in the slab and excavation of a small pit where the SSV pipe penetrates the slab also dramatically improve this pressure field extension. Our findings are consistent with the results of prior field studies; however, the studies reported here have improved our understanding of factors affecting SSV performance. The dependence of SSV performance on the relevant parameters are currently under investigation with the model. C1 LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,90-3058 1 CYCLOTRON RD,BERKELEY,CA 94720. WASHINGTON STATE ENERGY OFF,WASHINGTON ENERGY EXTENS SERV,SPOKANE,WA 99201. OI Gadgil, Ashok/0000-0002-0357-9455 NR 17 TC 12 Z9 12 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD SEP PY 1992 VL 26 IS 9 BP 1752 EP 1759 DI 10.1021/es00033a006 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JL086 UT WOS:A1992JL08600011 ER PT J AU POLZER, WL RAO, MG FUENTES, HR BECKMAN, RJ AF POLZER, WL RAO, MG FUENTES, HR BECKMAN, RJ TI THERMODYNAMICALLY DERIVED RELATIONSHIPS BETWEEN THE MODIFIED LANGMUIR ISOTHERM AND EXPERIMENTAL PARAMETERS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID MULTI-SOLUTE ADSORPTION; DERIVATION; EQUILIBRIA; SOILS AB The modified Langmuir isotherm parameters and the thermodynamic ion-exchange properties are developed from theoretical considerations leading to the derivation of a relationship between the two. For the binary ion-exchange system, the relationship indicates that a unique set of isotherm parameters can be defined by a minimum set of experimental parameters. Those parameters are the solid-liquid ratio and the initial concentration of the competing solute in the liquid and exchanger phases. In principle, unique sets of isotherm parameters can be predicted for different conditions from a known set of experimentally determined parameters. The effect of experimental parameters (e.g., solid-liquid ratio and competing solute concentration) on isotherm parameters (e.g., linear K(d)) have been documented in the literature. Experimental data are used to illustrate the derived relationships. C1 HOWARD UNIV,DEPT CHEM ENGN,WASHINGTON,DC 20059. UNIV TEXAS,DEPT CIVIL ENGN,EL PASO,TX 79968. UNIV TEXAS,DEPT GEOL SCI,EL PASO,TX 79968. LOS ALAMOS NATL LAB,DIV ANAL & ASSESSMENT,LOS ALAMOS,NM 87545. RP POLZER, WL (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545, USA. NR 37 TC 8 Z9 8 U1 0 U2 4 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 SEP PY 1992 VL 26 IS 9 BP 1780 EP 1786 DI 10.1021/es00033a011 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JL086 UT WOS:A1992JL08600016 ER PT J AU DOWNAROWICZ, T MAULDIN, RD WARNOCK, TT AF DOWNAROWICZ, T MAULDIN, RD WARNOCK, TT TI RANDOM CIRCLE HOMEOMORPHISMS SO ERGODIC THEORY AND DYNAMICAL SYSTEMS LA English DT Article AB We investigate the behaviour of random homeomorphisms of the circle induced by composing a random homeomorphism of the interval with a randomly chosen rotation. These maps and their iterates are a.s. singular and for each rational number r in [0, 1) it is shown that there is a positive probability of obtaining a map with rotation number r. For a 'canonical' method of producing these maps, bounds on the probability of obtaining a fixed point are obtained. We estimate this probability via computer simulations in three different ways. Simulations are also carried out for two periods. It remains unknown for this method whether a rational rotation number is obtained a.s. C1 WROCLAW TECH UNIV,INST MATH,PL-50370 WROCLAW,POLAND. UNIV N TEXAS,DEPT MATH,DENTON,TX 76203. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 6 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0143-3857 J9 ERGOD THEOR DYN SYST JI Ergod. Theory Dyn. Syst. PD SEP PY 1992 VL 12 BP 441 EP 458 PN 3 PG 18 WC Mathematics, Applied; Mathematics SC Mathematics GA JN030 UT WOS:A1992JN03000005 ER PT J AU BECKER, CD AF BECKER, CD TI POPULATION-GROWTH VERSUS FISHERIES RESOURCES - EXPLODING HUMAN-POPULATIONS THROUGHOUT THE WORLD HAVE ADVERSELY AFFECTED FISH AND FISHERIES SO FISHERIES LA English DT Editorial Material RP BECKER, CD (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 7 Z9 8 U1 1 U2 1 PU AMER FISHERIES SOC PI BETHESDA PA 5410 GROSVENOR LANE SUITE 110, BETHESDA, MD 20814-2199 SN 0363-2415 J9 FISHERIES JI Fisheries PD SEP-OCT PY 1992 VL 17 IS 5 BP 4 EP 5 PG 2 WC Fisheries SC Fisheries GA JN323 UT WOS:A1992JN32300002 ER PT J AU WARZINSKI, RP KHAN, MR AF WARZINSKI, RP KHAN, MR TI FUEL PRETREATMENT FOR CONVERSION - INTRODUCTION TO SYMPOSIUM PAPERS SO FUEL LA English DT Editorial Material C1 TEXACO USA INC,RES CTR,BEACON,NY 12508. RP WARZINSKI, RP (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD SEP PY 1992 VL 71 IS 9 BP 979 EP 980 DI 10.1016/0016-2361(92)90105-W PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA JK089 UT WOS:A1992JK08900001 ER PT J AU WARZINSKI, RP HOLDER, GD AF WARZINSKI, RP HOLDER, GD TI PYRIDINE TREATMENT OF ILLINOIS .6. COAL THE EFFECT OF PYRIDINE REMOVAL ON PARTICLE MORPHOLOGY AND THE LIQUEFACTION CHARACTERISTICS OF THE SOLUBLE AND INSOLUBLE COMPONENTS SO FUEL LA English DT Article; Proceedings Paper CT SYMP ON FUEL PRETREATMENT FOR CONVERSION, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC DE COAL LIQUEFACTION; SURFACE AREA; POROSITY ID SOLVENT; REACTIVITY; BEHAVIOR AB Illinois no. 6 coal was swollen and extracted with pyridine to produce pyridine-soluble and pyridine-insoluble fractions. The morphology and liquefaction behaviour of the pyridine-insoluble fraction was affected by the manner in which the residual pyridine was removed. Vacuum drying at 110-degrees-C caused collapse of the pore structure compared to the starting coal. This is evidenced by a loss in macropore surface area (measured with N2) and a decrease in porosity. Using supercritical CO2 extraction to remove the residual pyridine maintained the expanded pore structure. Both the macropore and micropore (measured with CO2) surface areas and the porosity increased. The expanded structure, however, collapsed with time. Thermal and catalytic liquefaction of the supercritical-CO2-extracted sample showed marginal improvements in conversion compared to results for the vacuum-dried sample. Additional liquefaction tests were performed on both the pyridine-soluble and insoluble fractions of the Illinois no. 6 coal, and on samples reconstituted from these fractions in proportions similar to those in the unextracted coal. A hydrogen-donor solvent or catalyst was found to be necessary to prevent retrogressive reactions from occurring in the pyridine-soluble material. The conversion of a reconstituted sample under catalytic liquefaction conditions was less than that observed for the original coal but higher than the value estimated from the conversions of the separate pyridine-soluble and pyridine-insoluble components. C1 UNIV PITTSBURGH,DEPT CHEM & PETR ENGN,PITTSBURGH,PA 15261. RP WARZINSKI, RP (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 39 TC 4 Z9 4 U1 1 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 SEP PY 1992 VL 71 IS 9 BP 993 EP 1002 DI 10.1016/0016-2361(92)90107-Y PG 10 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA JK089 UT WOS:A1992JK08900003 ER PT J AU VORRES, KS WERTZ, DL MALHOTRA, V DANG, YH JOSEPH, JT FISHER, R AF VORRES, KS WERTZ, DL MALHOTRA, V DANG, YH JOSEPH, JT FISHER, R TI DRYING OF BEULAH-ZAP LIGNITE SO FUEL LA English DT Article; Proceedings Paper CT SYMP ON FUEL PRETREATMENT FOR CONVERSION, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC DE LIQUEFACTION; DRYING; LIGNITE ID COALS AB Lignite dried in a stream of dry nitrogen at moderate temperatures (20-80-degrees-C) loses water in two distinguishable modes. The first mode represents about 80-85% of the loss of moisture. The second represents the other 15-20% lost under these conditions. The rate follows a unimolecular mechanism (like radioactive decay) for each mode. The activation energy for the first mode is close to the heat of vaporization of water. The rate is dependent upon the gas flow around the sample and the weight (or thickness) of the sample. Work at Amoco Oil Company indicated that the oil yield was higher for the dried coal than for raw or partly dried lignite. Work at Southern Illinois University showed that the mechanism was the same when differential scanning calorimetry was used to follow the kinetics of drying. Other work at the University of Southern Mississippi showed that the physical structure of the lignite (measured by X-rav diffraction) is measurably different for the dried and raw materials. C1 UNIV SO MISSISSIPPI,DEPT CHEM,HATTIESBURG,MS 39406. SO ILLINOIS UNIV,DEPT PHYS,CARBONDALE,IL 62901. AMOCO OIL CO,RES & DEV,NAPERVILLE,IL 60566. RP VORRES, KS (reprint author), ARGONNE NATL LAB,DIV CHEM,BLDG 211,ARGONNE,IL 60439, USA. NR 10 TC 43 Z9 46 U1 1 U2 4 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 SEP PY 1992 VL 71 IS 9 BP 1047 EP 1053 DI 10.1016/0016-2361(92)90113-3 PG 7 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA JK089 UT WOS:A1992JK08900009 ER PT J AU STOTLER, DP AF STOTLER, DP TI TRANSPORT SIMULATIONS OF A DENSITY LIMIT IN RADIATION-DOMINATED TOKAMAK DISCHARGES-II SO FUSION TECHNOLOGY LA English DT Article DE TOKAMAK; DENSITY LIMIT; SIMULATION ID COMPACT IGNITION TOKAMAK; PLASMA TRANSPORT; IMPURITIES; ALGORITHM AB Previously developed procedures that simulate the radiatively induced tokamak density limit are used to examine the scaling of the density limit in more detail. The maximum allowable density increases with auxiliary power and decreases with impurity concentration. However, there is little dependence of the density limit on plasma elongation. These trends are consistent with experimental results. Previous work used coronal equilibrium impurities; the primary result was that the maximum density increases with current when peaked profiles are assumed. Here, this behavior is shown to occur with a coronal nonequilibrium impurity as well. RP STOTLER, DP (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Stotler, Daren/J-9494-2015 OI Stotler, Daren/0000-0001-5521-8718 NR 34 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD SEP PY 1992 VL 22 IS 2 BP 199 EP 207 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JK627 UT WOS:A1992JK62700001 ER PT J AU VOLD, EL PRINJA, AK NAJMABADI, F CONN, RW AF VOLD, EL PRINJA, AK NAJMABADI, F CONN, RW TI COUPLED PLASMA-NEUTRAL FLUID TRANSPORT COMPUTATIONS USING THE NEUTRAL DIFFUSION-APPROXIMATION SO FUSION TECHNOLOGY LA English DT Article DE PLASMA BOUNDARY; COMPUTATIONAL TRANSPORT; NEUTRAL DIFFUSION ID TOKAMAK REACTOR; ATOM TRANSPORT; DIVERTOR; EDGE; LIMITER; CONFINEMENT; BOUNDARY; ASDEX AB A one-group diffusion approximation to neutral transport in a plasma is incorporated in a two-dimensional (theta-r) computational code, EPIC, coupling transport and recycling of the plasma-neutral fluids in a consistent finite discretization scheme. Boundary conditions accommodate particle recycling at the edge-core plasma interface. Neutral particle reflection from the pumping duct characterizes a given pumping system. Marginal validity of the diffusion approximation motivates extensive comparisons of the results with Monte Carlo (DEGAS) transport calculations. In prescribed and in self-consistently computed plasma solutions, the neutral diffusion results are comparable with the Monte Carlo results for radial and poloidal profiles of atomic neutral density over a wide range of limiter and divertor edge plasmas. Steady-state density and temperature contours for the Axially Symmetric Divertor Experiment (ASDEX) diverted tokamak are consistent with previous computations using fixed boundary conditions at the separatrix, but show reduced (20%) recycling attributed to the more realistic neutral atom transport by charge-exchange scattering in the diffusion model. Time-dependent plasma solutions with flux boundary conditions across the separatrix are more consistent with experimental data than results with fixed value boundary conditions at the separatrix. The flux across the separatrix is dominated by recycled particles from the edge plasma. A conclusion is that while the one-group diffusion treatment oversimplifies the physics of neutral transport, it is computationally efficient and adequate in accuracy and therefore well suited for edge plasma and for plasma-neutral recycling studies. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,DEPT MECH AEROSP & NUCL ENGN,LOS ANGELES,CA 90024. RP VOLD, EL (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 34 TC 4 Z9 4 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD SEP PY 1992 VL 22 IS 2 BP 208 EP 226 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JK627 UT WOS:A1992JK62700002 ER PT J AU CHRISTENSEN, RM DRESSELHAUS, MS AF CHRISTENSEN, RM DRESSELHAUS, MS TI A SYMMETRY CRITERION FOR ARRANGEMENTS OF ENERGY-SOURCES IN SPHERICAL TARGET EXCITATION SO FUSION TECHNOLOGY LA English DT Article DE SYMMETRY; GROUP THEORY; ISOTROPY ID INERTIAL CONFINEMENT; ILLUMINATION; UNIFORMITY; FUSION; C-60 AB A symmetry-based criterion is developed for arranging source locations to produce a nearly spherically uniform, volumetric deformation of a spherical target. The criterion requires that the source coordinates be combined in a certain manner to form an isotropic second-rank tensor. This criterion, combined with a method for maximizing the symmetry, produces a sequence of preferred configurations given by 4 T, 6C, 12I, 20I, 30I, 32I, 42I, 50I, 60I, and 62I , where the integer is the number of sources and where T, C, and I refer, respectively, to specific tetrahedral, cubic, and icosahedral symmetry arrangements. The results are of interest for a generic class of problems involving the excitation of a spherical medium through mechanical thermal, or electromagnetic energy deposition by discrete sources. C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. RP CHRISTENSEN, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,POB 808,L-355,LIVERMORE,CA 94550, 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD SEP PY 1992 VL 22 IS 2 BP 271 EP 279 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JK627 UT WOS:A1992JK62700007 ER PT J AU HENDRICKSTAYLOR, LR BACHINSKI, LL SICILIANO, MJ FERTITTA, A TRASK, B DEJONG, PJ LEDBETTER, DH DARLINGTON, GJ AF HENDRICKSTAYLOR, LR BACHINSKI, LL SICILIANO, MJ FERTITTA, A TRASK, B DEJONG, PJ LEDBETTER, DH DARLINGTON, GJ TI THE CCAAT/ENHANCER BINDING-PROTEIN (C/EBP-ALPHA) GENE (CEBPA) MAPS TO HUMAN-CHROMOSOME 19Q13.1 AND THE RELATED NUCLEAR FACTOR NF-IL6 (C/EBP-BETA) GENE (CEBPB) MAPS TO HUMAN-CHROMOSOME 20Q13.1 SO GENOMICS LA English DT Article ID ENRICHED TRANSCRIPTIONAL ACTIVATOR; SOMATIC-CELL HYBRIDS; LEUCINE ZIPPER; INSITU HYBRIDIZATION; HEPATOMA-CELLS; REPAIR GENE; EXPRESSION; FAMILY; COMPLEMENTATION; IDENTIFICATION C1 MD ANDERSON CANC CTR,DEPT MOLEC GENET,HOUSTON,TX 77054. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. BAYLOR COLL MED,DEPT PATHOL,HOUSTON,TX 77054. RP HENDRICKSTAYLOR, LR (reprint author), BAYLOR COLL MED,INST MOLEC GENET,HOUSTON,TX 77054, USA. FU NIGMS NIH HHS [GM10898, GM10481, GM10897] NR 45 TC 37 Z9 37 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP PY 1992 VL 14 IS 1 BP 12 EP 17 DI 10.1016/S0888-7543(05)80276-9 PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JK971 UT WOS:A1992JK97100003 PM 1427819 ER PT J AU TRASK, B CHRISTENSEN, M FERTITTA, A BERGMANN, A ASHWORTH, L BRANSCOMB, E CARRANO, A VANDENENGH, G AF TRASK, B CHRISTENSEN, M FERTITTA, A BERGMANN, A ASHWORTH, L BRANSCOMB, E CARRANO, A VANDENENGH, G TI FLUORESCENCE INSITU HYBRIDIZATION MAPPING OF HUMAN CHROMOSOME-19 - MAPPING AND VERIFICATION OF COSMID CONTIGS FORMED BY RANDOM RESTRICTION ENZYME FINGERPRINTING SO GENOMICS LA English DT Article ID INTERPHASE CELL-NUCLEI; HIGH-RESOLUTION; DNA-SEQUENCES; LIBRARIES; CLONES; GENE RP TRASK, B (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,CTR HUMAN GENOME,L-452,POB 5507,LIVERMORE,CA 94550, USA. FU NHGRI NIH HHS [HG-00256-01] NR 17 TC 18 Z9 18 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 0888-7543 J9 GENOMICS JI Genomics PD SEP PY 1992 VL 14 IS 1 BP 162 EP 167 DI 10.1016/S0888-7543(05)80299-X PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JK971 UT WOS:A1992JK97100026 PM 1330881 ER PT J AU SCHALLA, R AF SCHALLA, R TI INSITU CHEMICAL SENSORS - HOW PRACTICAL ARE THEY FOR MONITORING GROUND-WATER SO GROUND WATER MONITORING AND REMEDIATION LA English DT Editorial Material RP SCHALLA, R (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU GROUND WATER PUBLISHING CO PI WESTERVILLE PA 601 DEMPSEY RD, WESTERVILLE, OH 43081 SN 1069-3629 J9 GROUND WATER MONIT R JI Ground Water Monit. Remediat. PD FAL PY 1992 VL 12 IS 4 BP 5 EP 6 DI 10.1111/j.1745-6592.1992.tb00063.x PG 2 WC Water Resources SC Water Resources GA JU488 UT WOS:A1992JU48800001 ER PT J AU VENKATADRI, R TSAI, SP VUKANIC, N HEIN, LB AF VENKATADRI, R TSAI, SP VUKANIC, N HEIN, LB TI USE OF A BIOFILM MEMBRANE REACTOR FOR THE PRODUCTION OF LIGNIN PEROXIDASE AND TREATMENT OF PENTACHLOROPHENOL BY PHANEROCHAETE-CHRYSOSPORIUM SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB A wide range of hazardous compounds are transformed by the white rot fungus Phanerochaete chrysosporium and its extracellular enzyme lignin peroxidase. Low levels of lignin peroxidase produced by P. chrysosporium, slow growth of the organism resulting in low degradation rates, and the lack of reliable bioreactor systems are some of the constraints in the application of this fungal system in hazardous waste treatment. This research focused on the use of a biofilm membrane stirred tank reactor for the improved production of lignin peroxidase and treatment of pentachlorophenol by P. chrysosporium. Surface area available for biofilm growth and glucose consumption amounts were found to be important parameters affecting lignin peroxidase production. Conditions yielding high enzyme production were subsequently used for studies on treatment of pentachlorophenol (PCP), a common priority pollutant. The overall rate of PCP disappearance in the bioreactor was found to be 10.5 mg/L-day, which was found to be a five-fold increase over the rate obtained in flask-scale experiments. Due to the highly nonspecific nature of the white rot fungal system, the bioreactor system and the operating conditions used in this study are expected to be applicable to the treatment of other hazardous compounds and hazardous wastes. RP VENKATADRI, R (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,BLDG 362,ARGONNE,IL 60439, USA. NR 0 TC 6 Z9 6 U1 0 U2 3 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0882-5696 J9 HAZARD WASTE HAZARD JI Hazard. Waste Hazard. Mater. PD FAL PY 1992 VL 9 IS 3 BP 231 EP 243 DI 10.1089/hwm.1992.9.231 PG 13 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JR365 UT WOS:A1992JR36500003 ER PT J AU WILLETT, KL TURNER, RR BEAUCHAMP, JJ AF WILLETT, KL TURNER, RR BEAUCHAMP, JJ TI EFFECT OF CHEMICAL FORM OF MERCURY ON THE PERFORMANCE OF DOSED SOILS IN STANDARD LEACHING PROTOCOLS - EP AND TCLP SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB Application of the EP (Extraction Procedure) and TCLP (Toxicity Characteristic Leaching Procedure) to a variety of mercury-contaminated soils and solid wastes from U.S. Department of Energy facilities in Oak Ridge, Tennessee, has not shown any consistent relationship between test results and total mercury concentrations. To determine the effects of the chemical form of mercury on leaching results, samples of uncontaminated soil were dosed with four different forms of mercury (Hg0, HgS, HgO, Hg2O) at three concentrations (100, 1000, 10000 mug/g) and then subjected to headspace mercury vapor analysis and application of the two leaching protocols. None of the leaching protocol results for soil dosed with Hg0 or HgS exceeded the Resource Conservation and Recovery Act (RCRA) limit (200 mug/L) even at the highest dosing level (10000 mug/g). For both mercury oxide forms only the higher soil concentrations (1000 and 10000 mug/g) yielded leachate concentrations exceeding the RCRA limit. In general, the TCLP yielded higher leachate concentrations of mercury than the EP. This study verified that, where the chemical form of mercury is unknown, total mercury concentrations in the soil or waste provide no clue as to the performance of a soil in the leaching protocols. Results of sample headspace analysis, in addition to TCLP results and analysis for total mercury, are recommended to fully evaluate the hazards of mercury-contaminated waste and soil. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. UNIV N CAROLINA,DEPT CHEM,CHAPEL HILL,NC 27514. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. NR 0 TC 13 Z9 13 U1 2 U2 2 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0882-5696 J9 HAZARD WASTE HAZARD JI Hazard. Waste Hazard. Mater. PD FAL PY 1992 VL 9 IS 3 BP 275 EP 288 DI 10.1089/hwm.1992.9.275 PG 14 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JR365 UT WOS:A1992JR36500006 ER PT J AU LIU, JC SIMS, CS AHMED, AB AF LIU, JC SIMS, CS AHMED, AB TI A PROPOSED 4-ELEMENT NEUTRON-PHOTON-BETA THERMOLUMINESCENCE DOSIMETER SO HEALTH PHYSICS LA English DT Article DE NEUTRONS; ALGORITHM; THERMOLUMINESCENCE DOSIMETRY; BETA-PARTICLES AB It is common practice for a worker exposed to a mixed field with neutrons to wear both a photon-beta dosimeter and a neutron dosimeter. In this study, a thermoluminescence dosimeter has been designed and is proposed for use in mixed fields. The maximum applicable ranges of the mixed field can have photons with unknown energy from 20 keV to 2 MeV, betas with unknown energy from Pm-147 to Sr-90-Y, and neutrons of known energy from thermal to 15 MeV. This proposed dosimeter (a combination of Harshaw beta-gamma thermoluminescence dosimeter and albedo neutron thermoluminescence dosimeter) has an advantage of using a minimum number of thermoluminescence dosimeter elements (therefore, making it less costly) to measure the dose equivalents in a mixed field of neutron, photon, and beta radiation. The basic dosimeter design consists of four thermoluminescence elements of TLD-600 and TLD-700 with different filtrations. Using the high-temperature peak methodology for TLD-600 and a filtration algorithm, the neutron, photon, and beta dose equivalents in a mixed field can be determined. The design, detection principle, and three dosimetric algorithms for three versions of the basic design of the four-element dosimeter are presented and discussed. The work that is required for the proposed dosimeter to be usable when it is made is also presented. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP LIU, JC (reprint author), STANFORD LINEAR ACCELERATOR CTR, MS 48, POB 4349, STANFORD, CA 94309 USA. NR 9 TC 3 Z9 3 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1992 VL 63 IS 3 BP 316 EP 323 DI 10.1097/00004032-199209000-00007 PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JJ929 UT WOS:A1992JJ92900008 PM 1644568 ER PT J AU MACARTHUR, DW ALLANDER, KS BOUNDS, JA BUTTERFIELD, KB MCATEE, JL AF MACARTHUR, DW ALLANDER, KS BOUNDS, JA BUTTERFIELD, KB MCATEE, JL TI LONG-RANGE ALPHA-DETECTOR SO HEALTH PHYSICS LA English DT Article DE DETECTOR, RADIATION; MONITORS, RADIATION; IONIZATION CHAMBERS; ALPHA-PARTICLES AB Historically, alpha-particle detectors have been limited by the very short range of alpha particles in air. This results in a number of problems inherent to alpha contamination detectors, such as relatively poor sensitivity, geometry limitations, and inefficient monitoring techniques. In this paper, we document tests of a new long-range alpha detector. The charges generated by the interaction of alpha particles with air can be transported over significant distances (several meters) in a moving current of air generated by a small fan. An ion chamber located in front of the fan measures the current carried by the moving ions and, hence, detects the alpha decays. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP MACARTHUR, DW (reprint author), LOS ALAMOS NATL LAB, MS J-562, LOS ALAMOS, NM 87645 USA. NR 15 TC 5 Z9 8 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1992 VL 63 IS 3 BP 324 EP 330 DI 10.1097/00004032-199209000-00008 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JJ929 UT WOS:A1992JJ92900009 PM 1644569 ER PT J AU BUCKNER, MA SIMS, CS AF BUCKNER, MA SIMS, CS TI NEUTRON DOSIMETRIC QUANTITIES FOR SEVERAL RADIOISOTOPIC NEUTRON SOURCES SO HEALTH PHYSICS LA English DT Note DE NEUTRONS; DOSE EQUIVALENT; NEUTRON DOSIMETRY; CF-252 ID SPECTRA AB The fluence-weighted and dose equivalent-weighted average energies, and the spectrum-averaged fluence-to-dose equivalent conversion factors have been calculated for 52 spectrum variations of 20 different radioisotopic neutron sources. An internally consistent method of determination enables comparison of values for different spectra. The methodology and results are presented. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP BUCKNER, MA (reprint author), MARTIN MARIETTA ENERGY SYST INC, BALTIMORE, MD USA. NR 15 TC 5 Z9 5 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1992 VL 63 IS 3 BP 352 EP 355 DI 10.1097/00004032-199209000-00014 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JJ929 UT WOS:A1992JJ92900015 PM 1644573 ER PT J AU STROM, DJ STANSBURY, PS AF STROM, DJ STANSBURY, PS TI MINIMUM DETECTABLE ACTIVITY WHEN BACKGROUND IS COUNTED LONGER THAN THE SAMPLE SO HEALTH PHYSICS LA English DT Note DE RADIATION, BACKGROUND; BIOASSAY; MONITORING, AIR; MONITORING, ENVIRONMENTAL AB This note discusses the use of blank or background counting data that are measured for times that differ from times used for the sample counts. The correct formula for the minimum detectable activity, under this condition, is given as follows: MDA = [3 + 3.29 square-root R(b)t(g)(1 + t(g)/t(b))]/epsilon-t(g), where R(b) denotes background count rate, t(b) and t(g) denote background and gross count times, and epsilon denotes counting efficiency. Counting backgrounds for a long time reduces decision levels, uncertainties, and minimum detectable activities. These benefits are fully available only when there is no other source of variability than random fluctuations in count rates. RP STROM, DJ (reprint author), PACIFIC NW LAB, DEPT HLTH PHYS, POB 999, RICHLAND, WA 99352 USA. NR 6 TC 23 Z9 23 U1 0 U2 2 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1992 VL 63 IS 3 BP 360 EP 361 DI 10.1097/00004032-199209000-00016 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JJ929 UT WOS:A1992JJ92900017 PM 1644575 ER PT J AU WING, S SHY, CM WOOD, JL CRAGLE, DL AF WING, S SHY, CM WOOD, JL CRAGLE, DL TI MORE ON THE OAK RIDGE MORTALITY STUDY - REPLY SO HEALTH PHYSICS LA English DT Letter C1 OAK RIDGE ASSOCIATED UNIV, CTR EPIDEMIOL RES, OAK RIDGE, TN 37830 USA. RP WING, S (reprint author), UNIV N CAROLINA, SCH PUBL HLTH, DEPT EPIDEMIOL, CHAPEL HILL, NC 27599 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1992 VL 63 IS 3 BP 363 EP 363 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JJ929 UT WOS:A1992JJ92900019 ER PT J AU WIKOFF, P SUCIU, D SCHUTTE, W CARPENTER, G FORSNESS, V PRISBREY, K AF WIKOFF, P SUCIU, D SCHUTTE, W CARPENTER, G FORSNESS, V PRISBREY, K TI PRACTICAL ASSESSMENT OF A SOLVAY-TYPE HEAT AMPLIFYING PUMP SO HEAT RECOVERY SYSTEMS & CHP LA English DT Article AB The advantages of Solvay-type heat pumps include potentially high prime heat amplification factors. Our research took a theoretical approach to determining how good the amplification factors are. The process involved investigating a method used for selecting potential chemical reactions, such methods being an examination of chemical data-bases for good amplifying factors and good waste heat temperature boosts using graph theory algorithms. It appeared that Solvay heat pumps could be found to match a variety of industrial operating temperatures and waste heat availability with promising heat amplification. Assessment was made regarding the practicality of implementing real systems in general, including chemical product separation problems and reaction extent. RP WIKOFF, P (reprint author), EG&G IDAHO INC,IDAHO FALLS,ID 83401, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0890-4332 J9 HEAT RECOV SYST CHP JI Heat Recovery Syst. CHP PD SEP PY 1992 VL 12 IS 5 BP 377 EP 384 DI 10.1016/0890-4332(92)90058-P PG 8 WC Thermodynamics; Energy & Fuels; Engineering, Mechanical; Mechanics SC Thermodynamics; Energy & Fuels; Engineering; Mechanics GA KA037 UT WOS:A1992KA03700001 ER PT J AU FRITZ, JS AF FRITZ, JS TI THE CONTRARIAN VIEWPOINT SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Editorial Material C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP FRITZ, JS (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD SEP PY 1992 VL 15 IS 9 BP 569 EP 569 PG 1 WC Chemistry, Analytical SC Chemistry GA JR705 UT WOS:A1992JR70500001 ER PT J AU SUN, JJ FRITZ, JS AF SUN, JJ FRITZ, JS TI USE OF MERCURIC RESINS FOR SELECTIVE ABSTRACTION OF MERCAPTANS IN CAPILLARY GAS-CHROMATOGRAPHY SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Article DE CAPILLARY GC; SELECTIVITY; COMPOUND GROUP SEPARATION; CLEANUP; ADSORPTION OF SULFUR COMPOUNDS AB A small amount of mercuric non-porous resin placed in the liner of the injection splitter of a gas chromatograph retains mercaptans but allows other organic sulfur and non-sulfur compounds to be chromatographed normally: mercaptans in the gaseous state are retained by the mercuric resin.The method works well at 200-degrees-C but an increasing number of impurity peaks are observed as the temperature is increased to 250-degrees-C. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 7 TC 1 Z9 1 U1 0 U2 1 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD SEP PY 1992 VL 15 IS 9 BP 605 EP 608 PG 4 WC Chemistry, Analytical SC Chemistry GA JR705 UT WOS:A1992JR70500008 ER PT J AU SLATTERY, WL BENZ, W CAMERON, AGW AF SLATTERY, WL BENZ, W CAMERON, AGW TI GIANT IMPACTS ON A PRIMITIVE URANUS SO ICARUS LA English DT Article ID HYPOTHESIS; ORIGIN; MOON; SATELLITES; ACCRETION; EVOLUTION; PLANETS; SYSTEM; SPH C1 UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP SLATTERY, WL (reprint author), LOS ALAMOS NATL LAB,X-4 MS F664,LOS ALAMOS,NM 87544, USA. NR 26 TC 28 Z9 28 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0019-1035 J9 ICARUS JI Icarus PD SEP PY 1992 VL 99 IS 1 BP 167 EP 174 DI 10.1016/0019-1035(92)90180-F PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JU782 UT WOS:A1992JU78200015 ER PT J AU HETHERINGTON, DL KLEM, JF WEAVER, HT AF HETHERINGTON, DL KLEM, JF WEAVER, HT TI AN INTEGRATED GAAS N-P-N-P THYRISTOR JFET MEMORY CELL EXHIBITING NONDESTRUCTIVE READ SO IEEE ELECTRON DEVICE LETTERS LA English DT Article AB An integrated GaAs n-p-n-p thyristor-junction field effect transistor (JFET) structure displays memory by storing charge on the thyristor reverse-biased junctions. The device can be electrically programmed and erased through a single terminal. A buried p-channel, which also functions as the thyristor anode, is used to read stored charge nondestructively over a small range of applied drain voltages (+/- 1.5 V). Measured storage times exceeded 10 s at room temperature with an activation energy of approximately 0.6 eV. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HETHERINGTON, DL (reprint author), UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD SEP PY 1992 VL 13 IS 9 BP 476 EP 481 DI 10.1109/55.192800 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA JJ719 UT WOS:A1992JJ71900012 ER PT J AU BERSANELLI, M BENSADOUN, M DEAMICI, G LIMON, M SMOOT, GF TANAKA, S WITEBSKY, C YAMADA, J AF BERSANELLI, M BENSADOUN, M DEAMICI, G LIMON, M SMOOT, GF TANAKA, S WITEBSKY, C YAMADA, J TI CONSTRUCTION TECHNIQUE AND PERFORMANCE OF A 2 GHZ RECTANGULAR CORRUGATED HORN SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note ID BACKGROUND-RADIATION AB A large rectangular horn antenna with a center frequency of 2.0 GHz, corrugated on the E-plane walls, made out of aluminum sheet, has been designed, constructed, and tested. A new technique has been developed to solder thin aluminum strips onto the back plane to form the corrugations. The radiation beam pattern shows half-power beamwidths of 12-degrees and 14-degrees in the H- and E-planes, respectively, and sidelobe response below -40 dB at angles greater than 50-degrees from the horn axis. The measured return loss is greater than 20 dB (VSWR < 1.22) between 1.7 and 2.3 GH insertion loss is less than 0.15 dB. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. RP BERSANELLI, M (reprint author), CNR,IST FIS COSM,BASSINI 15,I-20133 MILAN,ITALY. OI Limon, Michele/0000-0002-5900-2698 NR 9 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD SEP PY 1992 VL 40 IS 9 BP 1107 EP 1107 DI 10.1109/8.166539 PG 1 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JX026 UT WOS:A1992JX02600017 ER PT J AU Reilly, KM Morgan, GH AF Reilly, Kevin M. Morgan, Gerry H. TI A Digital Technique for the Measurement of Power Losses in High Temperature Superconductors SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article AB A digital power loss measurement technique is described that enables the fast and accurate measurement of ac power losses in superconductors. This technique allows loss measurements at all frequencies limited only by the maximum sampling rate and buffer memory of the digital measuring device. Using the digital technique, power loss measurements on YBa2Cu3O7 are compared to similar measurements using the analog wattmeter. C1 [Reilly, Kevin M.] Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. [Morgan, Gerry H.] Brookhaven Natl Lab, Accelerator Dev Dept, Upton, NY 11973 USA. RP Reilly, KM (reprint author), Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. FU United States Department of Energy, Office of Utility Technologies, Office of Conservation and Renewable Energy [DE-AC02-76CH00016] FX This research was performed under the auspices of the United States Department of Energy, Office of Utility Technologies, Office of Conservation and Renewable Energy under Contract DE-AC02-76CH00016. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1051-8223 EI 1558-2515 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD SEP PY 1992 VL 2 IS 3 BP 181 EP 183 DI 10.1109/77.160158 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA V30OB UT WOS:000208824200010 ER PT J AU GIESE, RF SHEAHEN, TP WOLSKY, AM SHARMA, DK AF GIESE, RF SHEAHEN, TP WOLSKY, AM SHARMA, DK TI HIGH-TEMPERATURE SUPERCONDUCTORS - THEIR POTENTIAL FOR UTILITY APPLICATIONS SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article ID PROSPECTS; SYSTEM AB A number of proposed applications of superconductivity for the electric utility sector are described, the current status of their development is summarized, and the potential impact of successful development of high-temperature superconductors (HTSCs) is discussed. Performance goals for development of HTSCs are presented and compared with their current status (as of April 1990). Applications discussed include large-scale generators, motors, transmission lines, magnetic storage, transformers, power electronics, and fault-current limiters. C1 ELECT POWER RES INST,PALO ALTO,CA 94303. RP GIESE, RF (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 25 TC 8 Z9 8 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 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD SEP PY 1992 VL 7 IS 3 BP 589 EP 597 DI 10.1109/60.148582 PG 9 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA JE799 UT WOS:A1992JE79900029 ER PT J AU HABETLER, TG PROFUMO, F PASTORELLI, M TOLBERT, LM AF HABETLER, TG PROFUMO, F PASTORELLI, M TOLBERT, LM TI DIRECT TORQUE CONTROL OF INDUCTION MACHINES USING SPACE VECTOR MODULATION SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS LA English DT Article AB This paper describes a control scheme for direct torque and flux control of induction machines based on the stator flux field-orientation method. With the proposed predictive control scheme, an inverter duty cycle has directly calculated each fixed switching period based on the torque and flux errors, the transient reactance of the machine, and an estimated value of the voltage behind the transient reactance. The paper describes a method by which a voltage space vector can be calculated in order to control the torque and flux directly in a deadbeat fashion. The inverter duty cycle can then be calculated using the space vector PWM technique. With this scheme, the requirement of a separate current regulator and proportional-integral (PI) control of the flux, torque, and/or current error is eliminated, thereby improving transient performance. An alternative modulation scheme is presented in which transient performance is improved by specifying the inverter switching states a priori, then calculating the required switching instants to maintain deadbeat control of the flux while reducing the torque error during the entire switching interval. A similar approach is used for a transient in the flux. The implementation of the control scheme using DSP-based hardware is described, with complete experimental results given. C1 POLITECN TORINO, DIPARTIMENTO ELETTROTECN, I-10128 TURIN, ITALY. OAK RIDGE NATL LAB, MARTIN MARIETTA ENERGY SYST, OAK RIDGE, TN 37831 USA. UNIV WISCONSIN, DEPT ELECT & COMP ENGN, MADISON, WI 53706 USA. RP HABETLER, TG (reprint author), GEORGIA INST TECHNOL, DEPT ELECT ENGN, ATLANTA, GA 30332 USA. OI Tolbert, Leon/0000-0002-7285-609X NR 9 TC 386 Z9 427 U1 4 U2 21 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0093-9994 J9 IEEE T IND APPL JI IEEE Trans. Ind. Appl. PD SEP-OCT PY 1992 VL 28 IS 5 BP 1045 EP 1051 DI 10.1109/28.158828 PG 7 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA JP582 UT WOS:A1992JP58200007 ER PT J AU CARPENTER, KH WARREN, S AF CARPENTER, KH WARREN, S TI A WIDE BANDWIDTH, DYNAMIC HYSTERESIS MODEL FOR MAGNETIZATION IN SOFT FERRITES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article ID FERROMAGNETIC HYSTERESIS AB A wide bandwidth, dynamic model for the magnetization of the core material used in pulse transformers is needed to be able to perform accurate circuit simulations involving such transformers. We have obtained such a model by combining the approaches used in the static hysteresis models of Jiles and Atherton and of Coleman and Hodgdon, and adding two intuitively-based dynamic parameters. This dynamic model gives reasonable simulations of experimental data for soft ferrite cores subjected to pulses having rise times in the microsecond to nanosecond range. The parameters of the model are independent of the excitation. All but the two dynamic parameters may be obtained from static hysteresis data. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CARPENTER, KH (reprint author), KANSAS STATE UNIV AGR & APPL SCI,DEPT ELECT & COMP ENGN,MANHATTAN,KS 66506, USA. NR 11 TC 13 Z9 13 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 2037 EP 2041 DI 10.1109/20.179395 PN 1 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN872 UT WOS:A1992JN87200006 ER PT J AU NAZIRIPOUR, A DUAN, HM SHARP, J HERMANN, AM DEROCHEMONT, LP SQUILLANTE, M ZHANG, JG OAKES, CE PARILLA, PA BHATTACHARYA, RN BLAUGHER, RD AF NAZIRIPOUR, A DUAN, HM SHARP, J HERMANN, AM DEROCHEMONT, LP SQUILLANTE, M ZHANG, JG OAKES, CE PARILLA, PA BHATTACHARYA, RN BLAUGHER, RD TI SYNTHESIS AND PROPERTIES OF TLBACACUO FILMS PREPARED BY SPRAY PYROLYSIS METHOD SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB We report on the fabrication, characterization, and transport properties of TlBaCaCuO (TBCCO) high-T(c) superconducting films made from a low cost, simple spray pyrolysis technique. This technique is applicable to the fabrication of large-area films for the design and fabrication of conformal superconducting coatings and large area microwave devices. A high annealing temperature, close to the melting point of TBCCO, is needed in order to eliminate flaws, voids and cracks. C1 RADIAT MONITORING DEVICES INC,WATERTOWN,MA 02172. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP NAZIRIPOUR, A (reprint author), UNIV COLORADO,DEPT PHYS,CAMPUS BOX 390,BOULDER,CO 80309, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 2235 EP 2237 DI 10.1109/20.179454 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700048 ER PT J AU JILES, DC AF JILES, DC TI A SELF-CONSISTENT GENERALIZED-MODEL FOR THE CALCULATION OF MINOR LOOP EXCURSIONS IN THE THEORY OF HYSTERESIS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article AB This paper describes a generalization of the theory of hysteresis to cover asymmetric, or minor hysteresis loop excursions. The original description of the model was found to be particularly useful because it enabled hysteresis loops of magnetic materials to be successfully modelled with a limited set of only five physically based parameters. The extension of the model presented here is completely self consistent with the original formulation and requires no additional parameters to describe the minor loops. RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. RI Jiles, David/H-9548-2012 NR 7 TC 70 Z9 72 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9464 EI 1941-0069 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 2602 EP 2604 DI 10.1109/20.179570 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700164 ER PT J AU SIMION, BM THOMAS, G AF SIMION, BM THOMAS, G TI MICROSTRUCTURE CHARACTERIZATION OF SM-FE-ZR MELT-SPUN HARD MAGNETIC SYSTEMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB Several phases were identified in Smx-Fe73-Zr27-x melt-spun materials by transmission electron microscopy selected area diffraction pattern analysis. Aside from the PuNi3 -type phase common to materials with high and low Sm content, several other phases are thought to be present in the low coercivity system (x=14), such as Fe7Sm and Fe3Zr. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP SIMION, BM (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & ENGN,BERKELEY,CA 94620, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 2847 EP 2849 DI 10.1109/20.179647 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700241 ER PT J AU SIPAHI, LB SCHULZE, MP JILES, DC GREENOUGH, RD AF SIPAHI, LB SCHULZE, MP JILES, DC GREENOUGH, RD TI MICROMAGNETIC BARKHAUSEN EMISSION ANALYSIS OF TB0.3DY0.7FE2 UNDER THE ACTION OF AN ALTERNATING-FIELD EXCITATION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC ID MAGNETOSTRICTION AB The ternary alloy Tb0.3Dy0.7Fe2 has aroused great interest because of its minimum anisotropy among the alloys of dysprosium, terbium, and iron at room temperature which allows high magnetostrictions to be obtained at low field strengths. In this investigation, the Barkhausen effect emissions of this material have been analyzed with different techniques. These techniques included the waveforms, rms voltages, and pulse height spectra of the Barkhausen signals. The results have been compared with existing theories and it has been found that the amplitudes of Barkhausen emissions were in agreement with the ratio calculated in the three dimensional domain rotation model. The Barkhausen effect provides information that is complementary to that obtained through hysteresis measurements, and can be used to find the exact field strengths at which discontinuous domain rotation occurs. C1 UNIV HULL,DEPT APPL PHYS,HULL HU6 7RX,N HUMBERSIDE,ENGLAND. RP SIPAHI, LB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3153 EP 3155 DI 10.1109/20.179742 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700334 ER PT J AU SUN, KQ TANG, L THOMAS, G VITTORIA, C AF SUN, KQ TANG, L THOMAS, G VITTORIA, C TI MSVW PROPAGATION IN MULTILAYERED MAGNETIC-STRUCTURES WITH NONCOLLINEAR MAGNETIZATIONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC ID MAGNETOSTATIC SURFACE-WAVES; LAYERS AB This paper is to present a study of magnetostatic volume wave (MSVW) propagation in multilayered magnetic thin films with non-collinear magnetizations. YIG/GGG/YIG structure is used, where YIG and GGG are the abbreviations for yttrium iron garnet and gadolinium gallium garnet, respectively. The layered film is in the (110) plane. Due to the existence of both cubic and induced in-plane uniaxial anisotropy fields in the two YIG films, the two magnetizations (M1 over arrow pointing right and M2 over arrow pointing right) are not aligned with the applied dc field. Since there is an angle between M1 over arrow pointing right and M2 over arrow pointing right, there is a new configuration to study MSVW propagation. We have found that the angle between the two static magnetizations and the separation distance between films strongly affect the dispersion relationship. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,BOSTON,MA 02115. RP SUN, KQ (reprint author), JACKSON STATE UNIV,DEPT TECHNOL,JACKSON,MS 39217, USA. NR 13 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3198 EP 3200 DI 10.1109/20.179757 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700349 ER PT J AU HANNA, SM PIVIT, E KEANE, J AF HANNA, SM PIVIT, E KEANE, J TI YIG TUNERS FOR RF CAVITIES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC ID FERRITE AB Tuning of radio frequency (RF) accelerator cavities in electron storage rings is needed to maintain accelerating gap voltage under varying beam loading conditions. A new type of ferrite tuner based on stripline configuration as been tested at the National Synchrotron Light Source (NSLS). The tuner is basically a short-circuited ferrite-loaded transmission line which is inductively coupled to the RF cavity to be tuned. The use of substituted yttrium iron garnet (YIG) allows for custom tailoring the saturation magnetization to the specific application and thus minimizing the blas field requirement. The design goal for the tuner was to achieve a tuning range of 50 KHz. We were able to demonstrate linear tunability of 78 KHz, exceeding the goals set for the tuner. Results of testing the YIG tuner are presented. RP HANNA, SM (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 5 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3210 EP 3212 DI 10.1109/20.179761 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700353 ER PT J AU SABETFAKHRI, K HANNA, SM AF SABETFAKHRI, K HANNA, SM TI OBSERVATION OF HIGHER-ORDER FLOQUET MODES IN MAGNETOACOUSTIC INTERACTIONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB The higher-order space-time Floquet harmonics resulting from the scattering of magnetostatic waves by surface acoustic waves have been investigated. Experimental results are reported on the observation of these higher-order modes in magneto-acoustic Bragg interactions in magnetic films. The results we compared to the theoretical predictions based on the coupled-mode analysis. RP SABETFAKHRI, K (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 6 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3294 EP 3296 DI 10.1109/20.179788 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700380 ER PT J AU HE, JL WANG, Z ROTE, DM WINKELMAN, S AF HE, JL WANG, Z ROTE, DM WINKELMAN, S TI INVESTIGATION OF THE STABILITY OF AC REPULSIVE-FORCE LEVITATION SYSTEMS FOR LOW-SPEED MAGLEV SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB This paper discusses the stability of an ac induction levitation system, focusing on the analysis and optimum design of the secondary conductor. Several improved secondary conductor geometries are considered. A theoretical model with numerical results as well as experimental observations and data are presented. RP HE, JL (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,CTR TRANSPORTAT RES,ARGONNE,IL 60439, USA. NR 4 TC 7 Z9 7 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3315 EP 3317 DI 10.1109/20.179795 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700387 ER PT J AU MULCAHY, TM HULL, JR ALMER, JD ROSSING, TD AF MULCAHY, TM HULL, JR ALMER, JD ROSSING, TD TI EDGE EFFECTS ON FORCES AND MAGNETIC-FIELDS PRODUCED BY A CONDUCTOR MOVING PAST A MAGNET SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB Experiments were performed to further understand the forces acting on magnets moving near the edge of a conducting strip and to produce a data set for the validation of analysis methods. Mapping the magnetic field gives information about the eddy currents induced in the conductor, which agrees with numerical calculations. C1 NO ILLINOIS UNIV,DE KALB,IL 60115. RP MULCAHY, TM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 5 TC 2 Z9 4 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3318 EP 3320 DI 10.1109/20.179796 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700388 ER PT J AU WEISSENBERGER, S AF WEISSENBERGER, S TI DETERRENCE AND THE DESIGN OF TREATY VERIFICATION SYSTEMS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article AB Centered around the notion of deterrence, a framework for analyzing the performance of systems for verifying compliance with arms-control treaty constraints is developed. Using the same models, it is also shown how to evaluate the desirability of the treaty constraints themselves. This analysis forms a relatively unified treatment of both topics, one that permits the joint ''optimization'' of both treaty limits and verification mechanisms. The specific application here is underground nuclear testing, but because of the generality of the analysis one can apply it to other arms control contexts as well. RP WEISSENBERGER, S (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-228,LIVERMORE,CA 94551, USA. NR 8 TC 5 Z9 5 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD SEP-OCT PY 1992 VL 22 IS 5 BP 903 EP 915 DI 10.1109/21.179831 PG 13 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KE004 UT WOS:A1992KE00400004 ER PT J AU MEYER, MA AF MEYER, MA TI HOW TO APPLY THE ANTHROPOLOGICAL TECHNIQUE OF PARTICIPANT OBSERVATION TO KNOWLEDGE ACQUISITION FOR EXPERT SYSTEMS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article AB Participant observation requires that the researcher not only observes but participates in the activities of those persons being studied. The paper describes and illustrates how the anthropological method of participant observation can be used in manual knowledge acquisition to: 1) familiarize the knowledge engineer with the domain prior to interviews of the experts or users; 2) obtain information about the experts' or users' unconscious behaviors; 3) learn the experts' or users' views of themselves and their actions; 4) investigate the social processes by which expertise is developed and supported; and 5) aid the knowledge engineer's construction of personal models of the events and objects in the domain. Participant observation is compared to similar, more commonly used knowledge acquisition techniques, such as apprenticeship learning. Suggestions are given on how to use participant observation within knowledge engineering projects. RP MEYER, MA (reprint author), LOS ALAMOS NATL LAB,STAT GRP,MS F600,LOS ALAMOS,NM 87545, USA. NR 32 TC 9 Z9 9 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD SEP-OCT PY 1992 VL 22 IS 5 BP 983 EP 991 DI 10.1109/21.179838 PG 9 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KE004 UT WOS:A1992KE00400011 ER PT J AU HEINZEN, RA FRAZIER, ME MALLAVIA, LP AF HEINZEN, RA FRAZIER, ME MALLAVIA, LP TI COXIELLA-BURNETII SUPEROXIDE-DISMUTASE GENE - CLONING, SEQUENCING, AND EXPRESSION IN ESCHERICHIA-COLI SO INFECTION AND IMMUNITY LA English DT Article ID AMINO-ACID-SEQUENCE; MYCOBACTERIUM-TUBERCULOSIS; NOCARDIA-ASTEROIDES; NUCLEOTIDE-SEQUENCE; DNA FRAGMENTS; OXYGEN; HOST; TOXICITY; DEFENSES; ANTIGEN AB A superoxide dismutase (SOD) gene from the obligate intracellular bacterium Coxiella burnetii has been cloned, and its DNA sequence has been determined and expressed in Escherichia coli. The gene was identified on pSJR50, a pHC79-derived genomic clone, by using the polymerase chain reaction with degenerate oligonucleotide primers corresponding to conserved regions of known SODs. Sequences resembling conventional E. coli ribosomal and RNA polymerase-binding sites preceded the C. burnetii 579-bp SOD open reading frame. An E. coli SOD-deficient double mutant (sodA sodB) that carried pSJRSO had growth and survival responses similar to those of the wild type when the transformant was challenged with 0.05 mM paraquat and 5 mM hydrogen peroxide, respectively. These observations indicated that the C. burnetii gene was functionally expressed in E. coli. Staining of native polyacrylamide gels for SOD activity demonstrated that pSJR50 insert DNA codes for an SOD that comigrates with an SOD found in C. burnetii cell lysates. The enzyme was inactivated by 5 mM hydrogen peroxide, which is indicative of an iron-containing SOD. Additionally, the predicted amino acid sequence was significantly more homologous to known iron-containing SODs than to manganese-containing SODs. Isolation of the C. burnetii SOD gene may provide an opportunity to examine its role in the intracellular survival of this rickettsia. C1 WASHINGTON STATE UNIV, DEPT MICROBIOL, PULLMAN, WA 99164 USA. US DOE, OFF ENERGY RES, OFF HLTH & ENVIRONM RES, WASHINGTON, DC 20545 USA. FU NIAID NIH HHS [AI20190] NR 54 TC 46 Z9 51 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0019-9567 EI 1098-5522 J9 INFECT IMMUN JI Infect. Immun. PD SEP PY 1992 VL 60 IS 9 BP 3814 EP 3823 PG 10 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA JJ861 UT WOS:A1992JJ86100048 PM 1500190 ER PT J AU ROSTAMI, AA GREIF, R RUSSO, RE AF ROSTAMI, AA GREIF, R RUSSO, RE TI MODIFIED ENTHALPY METHOD APPLIED TO RAPID MELTING AND SOLIDIFICATION SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID PHASE-CHANGE AB The rapid melting and solidification of a target material was studied. The enthalpy technique was used in an explicit finite difference form to calculate the location of the solid-liquid interface and the temperature distribution in the target. The technique was modified so that it is not necessary that the temperature of the mesh containing the interface remain constant at the melting point. Instead, by using the energy boundary condition at the interface a new value of the temperature of the grid point is calculated at every time step. The materials between two grid points that are on each side of the interface consist of two phases with considerably different thermal conductivities. The thermal resistances of the material between these grid points were calculated by treating the region as a composite material. The effects of the duration, the temporal shape and the intensity of the laser pulse on the rate of propagation of the phase change and on the temperature distribution were studied. The results of the numerical prediction for the melt depth created in an aluminum target with a 100 ms electron beam were compared with experimental data and good agreement was obtained. C1 LAWRENCE BERKELEY LAB,DEPT MECH ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. NR 25 TC 12 Z9 12 U1 0 U2 1 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 SEP PY 1992 VL 35 IS 9 BP 2161 EP 2172 DI 10.1016/0017-9310(92)90060-6 PG 12 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA JP063 UT WOS:A1992JP06300009 ER PT J AU BOUILLARD, JX BERRY, GF AF BOUILLARD, JX BERRY, GF TI PERFORMANCE OF A MULTIGRID 3-DIMENSIONAL MAGNETOHYDRODYNAMIC GENERATOR CALCULATION PROCEDURE SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID FLOW; HEAT AB The formulation and evaluation of a recently developed multigrid finite difference calculation procedure for steady three-dimensional magnetohydrodynamic (MHD) flows are described. This procedure solves, in primitive variables, the parabolized steady-state MHD equation set, which consists of the mass continuity equation, three momentum equations, the energy equation, the turbulent kinetic energy and dissipation rate equations, and Maxwell's equations using a full approximation storage block implicit multigrid finite difference technique. This new technique is first validated by comparing predicted results with experimental data for supersonic and subsonic Faraday generators. The performance of this technique is then assessed in terms of computational speed and solution accuracy. It is shown that the resolution of Maxwell's elliptical electrical equations is computationally speed limiting. A global improvement factor of 3-5 is obtained by using the multigrid finite difference solution procedure. RP BOUILLARD, JX (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 28 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD SEP PY 1992 VL 35 IS 9 BP 2219 EP 2232 DI 10.1016/0017-9310(92)90065-Z PG 14 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA JP063 UT WOS:A1992JP06300014 ER PT J AU DEC, JE KELLER, JO ARPACI, VS AF DEC, JE KELLER, JO ARPACI, VS TI HEAT-TRANSFER ENHANCEMENT IN THE OSCILLATING TURBULENT-FLOW OF A PULSE COMBUSTOR TAIL-PIPE SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article AB Heat transfer rates in pulse combustor tail pipes and in other reversing, oscillating, turbulent flows have been found to be much higher than those of steady turbulent flow. To elucidate the mechanisms of the enhancement, the temperature and velocity fields, measured with two-line atomic fluorescence (TLAF) and laser Doppler velocimetry (LDV), respectively, are compared. Time-resolved wall heat fluxes and Nusselt numbers are also presented and discussed. Possible causes for the heat transfer enhancement in oscillating flows are reviewed and discussed in view of the data presented in this paper and the recent literature. C1 UNIV MICHIGAN,ANN ARBOR,MI 48109. RP DEC, JE (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 29 TC 37 Z9 46 U1 0 U2 3 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 SEP PY 1992 VL 35 IS 9 BP 2311 EP 2325 DI 10.1016/0017-9310(92)90074-3 PG 15 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA JP063 UT WOS:A1992JP06300023 ER PT J AU CHENOWETH, DR PAOLUCCI, S AF CHENOWETH, DR PAOLUCCI, S TI COMPRESSIBLE FLOW OF A 2-PHASE FLUID BETWEEN FINITE VESSELS .2. ABEL-NOBLE CARRIER GAS SO INTERNATIONAL JOURNAL OF MULTIPHASE FLOW LA English DT Article DE HOMOGENEOUS; EQUILIBRIUM; 2-PHASE; IDEAL GAS; FINITE VOLUME; COMPRESSIBLE; TRANSFER AB The rapid transfer of a mixture consisting of an Abel-Noble (AN) gas and constant density solid particles (or liquid droplets) without phase change is analytically investigated. The two-phase mixture is assumed to remain homogeneous and at equilibrium in a high-pressure supply vessel as well as during the expansion to a finite volume receiver. The physical conditions required for carrier gases to be accurately described by an AN equation of state are given. It is shown that the expanding mixture, or pseudo-fluid, behaves as a modified AN gas which is pseudo-polytropic. Special emphasis is placed on obtaining approximate analytical solutions which are mathematically valid for all parameter ranges of interest. The general sonic flow solution and the subsonic discharge limit represent two of the three cases which admit such approximate solutions. The third case involves subsonic solutions for the single-fluid problem, where initial particle mass fractions in the supply and receiver are the same. All of these special cases are unique in that, when properly non-dimensionalized, they only depend on the mixture ratio of specific heats and the initial mixture volume fraction combining the individual effects of the particles and gas molecules. Numerical results are also given for subsonic finite volume ratio cases, as well as other subsonic cases which show the effects of parameters describing separate particle and gas contributions not present in the three special approximate solutions. The general results show that often the more simple single-fluid solutions can be used to adequately estimate the behavior of more complex cases. C1 UNIV NOTRE DAME,DEPT AEROSP & MECH ENGN,NOTRE DAME,IN 46556. RP CHENOWETH, DR (reprint author), SANDIA NATL LABS,DEPT APPL MECH,LIVERMORE,CA 94551, USA. NR 11 TC 1 Z9 2 U1 2 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0301-9322 J9 INT J MULTIPHAS FLOW JI Int. J. Multiph. Flow PD SEP PY 1992 VL 18 IS 5 BP 669 EP 689 DI 10.1016/0301-9322(92)90038-I PG 21 WC Mechanics SC Mechanics GA JM707 UT WOS:A1992JM70700003 ER PT J AU WESTFALL, C AF WESTFALL, C TI HISTORY OF CERN, VOL 2, BUILDING AND RUNNING THE LABORATORY, 1954-1965 - HERMANN,A, KRIGE,J, MERSITS,U, PESTRE,D SO ISIS LA English DT Book Review C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP WESTFALL, C (reprint author), CONTINUOUS BEAM ELECTRON ACCELERATOR FACIL,NEWPORT NEWS,VA, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0021-1753 J9 ISIS JI Isis PD SEP PY 1992 VL 83 IS 3 BP 516 EP 517 DI 10.1086/356262 PG 2 WC History & Philosophy Of Science SC History & Philosophy of Science GA JL584 UT WOS:A1992JL58400063 ER PT J AU WEINBERG, AM AF WEINBERG, AM TI WHERE TO PUT THE WASTE SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Letter RP WEINBERG, AM (reprint author), OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD FAL PY 1992 VL 9 IS 1 BP 22 EP 23 PG 2 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA JU490 UT WOS:A1992JU49000021 ER PT J AU NERO, AV AF NERO, AV TI A NATIONAL STRATEGY FOR INDOOR RADON SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Article ID UNITED-STATES RP NERO, AV (reprint author), LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD FAL PY 1992 VL 9 IS 1 BP 33 EP 40 PG 8 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA JU490 UT WOS:A1992JU49000024 ER PT J AU KEEFER, DW DAVID, SA SMARTT, HB SPENCE, K AF KEEFER, DW DAVID, SA SMARTT, HB SPENCE, K TI WELDING SCIENCE - NEEDS AND FUTURE-DIRECTIONS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Editorial Material C1 OAK RIDGE NATL LAB,MAT JOINING,OAK RIDGE,TN. RP KEEFER, DW (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD SEP PY 1992 VL 44 IS 9 BP 6 EP 7 PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JM874 UT WOS:A1992JM87400001 ER PT J AU VISWANATHAN, S SIKKA, VK BRODY, HD AF VISWANATHAN, S SIKKA, VK BRODY, HD TI USING SOLIDIFICATION PARAMETERS TO PREDICT POROSITY DISTRIBUTIONS IN ALLOY CASTINGS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Quality criteria used in the computer-aided design and analysis of casting processes typically relate geometric, thermal, or solidification parameters to structural features such as centerline shrinkage and microporosity. Quality criteria for the prediction of porosity in castings have been used successfully in steel, but the application of criteria functions to nonferrous alloys has been less successful. Recent work suggests that the dominating mechanism that determines the amount and distribution of porosity in castings is strongly dependent on the solidification mode of the alloy and the solidification conditions. Accordingly, casting processes and alloy types are divided into four groups, and a different set of criteria functions are obtained for each group. C1 UNIV CONNECTICUT,SCH ENGN,STORRS,CT 06268. RP VISWANATHAN, S (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,MET WORK THEORY & PRACTICE GRP,OAK RIDGE,TN 37831, USA. NR 34 TC 3 Z9 3 U1 0 U2 1 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 SEP PY 1992 VL 44 IS 9 BP 37 EP 40 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JM874 UT WOS:A1992JM87400008 ER PT J AU NOVICK, VJ MONSON, PR ELLISON, PE AF NOVICK, VJ MONSON, PR ELLISON, PE TI THE EFFECT OF SOLID PARTICLE MASS LOADING ON THE PRESSURE-DROP OF HEPA FILTERS SO JOURNAL OF AEROSOL SCIENCE LA English DT Article AB The increase in pressure drop across a HEPA filter has been measured as a function of solid particle mass loading using three materials with different particle morphologies. Sodium chloride, ammonium chloride and aluminum oxide particles in several different size distributions were generated as challenge aerosols. For each particle size distribution, the mass of material loaded per unit area of filter per unit pressure decrease for a given filtration velocity (1/specific resistance) was measured. In all cases, specific resistance of the filter cake increased as the mass median particle diameter decreased. The experimental data for the specific resistance were found to be well correlated with the increase of the mass median particle diameter and independent of the particle density. The advantages of this approach over other methods are the use of a more convenient and easily measured particle diameter and the described approach does not require the measurement or prior knowledge of the particle cake porosity. This new correlation can be used to predict either the final pressure difference across a loaded HEPA filter or the maximum mass that can be loaded onto a filter for a specified pressure difference. C1 WESTINGHOUSE SAVANNAH RIVER CO,AIKEN,SC 29802. RP NOVICK, VJ (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 17 TC 37 Z9 39 U1 0 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0021-8502 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD SEP PY 1992 VL 23 IS 6 BP 657 EP 665 DI 10.1016/0021-8502(92)90032-Q PG 9 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JQ439 UT WOS:A1992JQ43900007 ER PT J AU LUAN, S PANG, HM SHUM, SCK HOUK, RS AF LUAN, S PANG, HM SHUM, SCK HOUK, RS TI NOISE CHARACTERISTICS OF AEROSOLS PRODUCED BY INDUCTIVELY COUPLED PLASMA NEBULIZERS SO JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY LA English DT Article; Proceedings Paper CT 1992 WINTER CONF ON PLASMA SPECTROCHEMISTRY CY JAN 06-11, 1992 CL SAN DIEGO, CA DE NOISE AMPLITUDE SPECTRA; AEROSOL; NEBULIZER; INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY ID ATOMIC EMISSION-SPECTROMETRY; FOURIER-TRANSFORM SPECTROMETRY; DIRECT INJECTION NEBULIZATION; SPRAY CHAMBER PRESSURE; LAMINAR-FLOW TORCH; POWER SPECTRA; MASS-SPECTROMETER; PNEUMATIC NEBULIZERS; SAMPLE INTRODUCTION; ISOTOPE RATIOS AB The noise characteristics of aerosols produced by inductively coupled plasma nebulizers were investigated. A laser beam was scattered by aerosol and detected by a photomultiplier tube and the noise amplitude spectrum of the scattered radiation was measured by a spectrum analyser. Discrete frequency noise in the aerosol generated by a Meinhard nebulizer or a direct injection nebulizer was primarily caused by pulsation in the liquid flow from the pump. By use of a pulse-free pump, such as a gas displacement pump or a dual piston pump for liquid chromatography, the discrete frequency noise was eliminated. The configuration of the spray chamber affected the level of white noise. A Scott-type spray chamber suppressed white noise, while a conical, straight-pass spray chamber enhanced white noise, relative to the noise seen from the primary aerosol. The noise in the aerosol from a continuous-flow ultrasonic nebulizer had a relatively high 1/f component. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 53 TC 15 Z9 15 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0267-9477 J9 J ANAL ATOM SPECTROM JI J. Anal. At. Spectrom. PD SEP PY 1992 VL 7 IS 6 BP 799 EP 805 DI 10.1039/ja9920700799 PG 7 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA JX915 UT WOS:A1992JX91500004 ER PT J AU PRASAD, SS AF PRASAD, SS TI PREDICTING THE ENVIRONMENTAL DISTRIBUTION OF COMPOUNDS WITH UNKNOWN PHYSICOCHEMICAL PROPERTIES FROM KNOWN PESTICIDE PROPERTIES SO JOURNAL OF AOAC INTERNATIONAL LA English DT Article ID BIOCONCENTRATION FACTORS; CHEMICALS AB Disposing of pesticides improperly can have environmental consequences. This study examines those properties discussed in published literature or derived from semiempirical mathematical models that are most likely to affect pesticides' environmental distribution, then assesses their migration between environmental media (soil, water, air, and biota). In particular, it examines how pesticide characteristics such as water solubility, molecular weight, bioconcentration, volatility, and soil adsorption affect soil-to-water mobility, water-to-air dissipation, and water-to-biota accumulation when present in the environmental medium of preferred residence. The study concludes that chemicals that have low water solubilities tend to adsorb to soil, those that have low vapor pressures tend to dissipate slowly from water, and those that have relatively high octanol-to-water partition coefficients or low water solubility have a high potential for bioconcentration. Under these situations, environmental restoration might best be achieved by removal of the contamination at the source. By drawing analogies from these findings, researchers should be able to predict the mobility of pesticides belonging to a particular category or family of pounds with unknown physicochemical properties, determine the harm that might result from their distribution under worst-case scenarios, and recommend ways to restore the environment. RP PRASAD, SS (reprint author), ARGONNE NATL LAB,DIV ENVIRONM ASSESSMENT & INFORMAT SCI,370 ENFANT PROMENADE SW,SUITE 702,WASHINGTON,DC 20024, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU AOAC INTERNATIONAL PI GAITHERSBURG PA 481 NORTH FREDRICK AVE, STE 500, GAITHERSBURG, MD 20877-2504 SN 1060-3271 J9 J AOAC INT JI J. AOAC Int. PD SEP-OCT PY 1992 VL 75 IS 5 BP 916 EP 924 PG 9 WC Chemistry, Analytical; Food Science & Technology SC Chemistry; Food Science & Technology GA JQ076 UT WOS:A1992JQ07600030 ER PT J AU GUDIKSEN, PH LEONE, JM KING, CW RUFFIEUX, D NEFF, WD AF GUDIKSEN, PH LEONE, JM KING, CW RUFFIEUX, D NEFF, WD TI MEASUREMENTS AND MODELING OF THE EFFECTS OF AMBIENT METEOROLOGY ON NOCTURNAL DRAINAGE FLOWS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID BOUNDARY-LAYER AB An experimental and modeling investigation of nocturnal drainage flows within the Mesa Creek valley in western Colorado revealed their wind and temperature characteristics and the effects of the ambient meteorology on their development. The valley, located about 30 km east of Grand Junction, is situated on the north slopes of the Grand Mesa. It is surrounded by ridges on three sides with low terrain toward the north. The terrain at the higher elevations is characterized by steep slopes that become shallower at the lower elevations. A network of seven meteorological towers and a monostatic sodar collected data within the study area from December 1988 through November 1989. Analysis of the experimental data indicated that shallow drainage flows generated over the many individual slopes at the higher elevations converge at the lower elevations to form deeper flows that join with those generated within adjacent drainage areas. The characteristics of the flows generally deviated from those displayed by idealized slope flows due to both internal circulations within the valley and external influences. During the summer, the depths of the flows were typically a few tens of meters along the upper slopes and about 100 m over the upper part of the lower slopes, while during the winter, the depths decreased to about 10 and 60 m, respectively. Their frequency of occurrence was highest during the summer or fall, about 50%, when the synoptic-scale influences were minimal. The flows along the upper slopes were particularly susceptible to influences by the ambient meteorology due to minimal terrain shielding. When the larger-scale ambient flows over the Grand Mesa were greater than about 5 m s-1, the surface cooling along the slopes was unable to develop and maintain the surface temperature inversion needed to generate strong drainage flows. The radiative cooling rates of the sloped surfaces, as characterized by net radiation measurements, were correlated with the downslope wind speeds observed along the upper slopes. Thus, a decrease in the observed net radiation level will produce a corresponding decrease in the downslope wind speed. Since temporal changes in net radiation levels are primarily governed by variations in atmospheric moisture, the effect of increased atmospheric moisture is to retard the development of the drainage flows. In order to place the observations in proper perspective, it was necessary to employ numerical models that account for the physical processes governing the dynamics of the flows. The general features of the wind and temperature characteristics of the valley circulations and the influence of strong ambient winds and atmospheric moisture on the drainage flows over the upper slopes could be accounted for by numerical modeling techniques based on solving the equations of momentum, continuity, and energy coupled with a surface energy budget and a radiation module. C1 NOAA,ERL,WAVE PROPAGAT LAB,BOULDER,CO 80303. RP GUDIKSEN, PH (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. RI Neff, William/E-2725-2010 OI Neff, William/0000-0003-4047-7076 NR 14 TC 27 Z9 28 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD SEP PY 1992 VL 31 IS 9 BP 1023 EP 1032 DI 10.1175/1520-0450(1992)031<1023:MAMOTE>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JK333 UT WOS:A1992JK33300001 ER PT J AU HAHN, S STEIN, HJ SHATAS, SC PONCE, FA AF HAHN, S STEIN, HJ SHATAS, SC PONCE, FA TI THERMAL DONOR FORMATION AND ANNIHILATION IN OXYGEN-IMPLANTED FLOAT-ZONE SILICON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RESISTIVITY AB The formation and annihilation behaviors of thermal donors in O-16+-, O-18+-, or O-16+ + C-12+-implanted float-zone silicon have been investigated with secondary ion mass spectrometry, spreading resistance probe, Hall effect, and transmission electron microscopy. Various oxygen or carbon+oxygen-implanted samples were laser annealed to remove implant damage and subjected to furnace annealing at 450-degrees-C for up to 100 h to activate oxygen-related thermal donors. Oxygen concentrations at the peak of the implanted profiles exceed the maximum for Czochralski Si by an order of magnitude. It is found that the third to fourth power dependence of thermal donor formation on oxygen generally observed for Czochralski Si does not hold for the higher oxygen concentration in the implanted layer. Annihilation characteristics of thermal donors formed in the oxygen implanted layers were investigated by the rapid thermal annealing technique. A rapid thermal anneal at 1150-degrees-C for 30 s was required to remove all the thermal donors. Based upon the annihilation kinetics data, it is tentatively concluded that both old and new thermal donors exist in the oxygen-implanted layer. For carbon+oxygen-coimplanted samples, the data have shown that carbon greatly increases the new thermal donor concentration in the implanted layer. Finally, precipitate morphologies for both oxygen-only- and carbon+oxygen-coimplanted samples after a 450-degrees-C furnace annealing were investigated by high resolution electron microscopy. In the case of oxygen-implant-only samples, predominant precipitate morphologies are needlelike while platelet defects predominate for carbon + oxygen-coimplanted samples. Since carbon increases the formation rate of new thermal donors, it is unlikely that they are distinctly related to needlelike precipitates as claimed in previous studies. C1 SILTEC SILICON,MENLO PK,CA 94025. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NANOSIL,SANTA CLARA,CA 95054. XEROX CORP,PALO ALTO RES CTR,PALO ALTO,CA 94304. RI Ponce, Fernando/M-8649-2013 OI Ponce, Fernando/0000-0002-1275-9386 NR 21 TC 10 Z9 10 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 SEP 1 PY 1992 VL 72 IS 5 BP 1758 EP 1765 DI 10.1063/1.351646 PG 8 WC Physics, Applied SC Physics GA JK804 UT WOS:A1992JK80400013 ER PT J AU KIM, C MORRIS, JW AF KIM, C MORRIS, JW TI THE INFLUENCE OF CU PRECIPITATION ON ELECTROMIGRATION FAILURE IN AL-CU-SI SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID THIN-FILMS; ALUMINUM FILMS; COPPER; DAMAGE; MICROSTRUCTURE; INTERCONNECTS; MECHANISMS; DEPENDENCE; MODEL AB This paper reports a study of the effect of Cu precipitation on electromigration failure in Al-2Cu-1Si thin-film conducting lines. The films were 0.5-mu-m in thickness, and patterned to widths of 1.3 and 4-mu-m, providing width-to-grain-size ratios (W/G) of approximately 0.5 and 2. The lines were aged for various times at 226-degrees-C, and were then tested to failure at a current density of 2.5 X 10(6) A/cm2. Scanning and transmission electron microscopy were used to study the Cu precipitate distribution, its evolution during aging and electromigration, and the microstructural failure mechanism. Aging produces a dense distribution of intragranular theta' (Al2Cu; coherent), with stable theta (Al2Cu; incoherent) in the grain boundaries. The theta' is replaced by theta as aging proceeds. In the wide lines (W/G almost-equal-to 2), the mean time to failure (MTF) increases slowly and monotonically with prior aging time. The failure happens through the growth and coalescence of intergranular voids. In the narrow lines (W/G almost-equal-to 0.5), both the MTF and the time to first failure increase by more than an order of magnitude when the line is aged for 24 h prior to testing, then decrease on further aging. The dominant failure mode is the "slit" failure mode previously observed in pure Al. However, the 24 h specimens fail by gradual, uniform thinning. Failure occurs in regions that have been swept free of intragranular precipitates. The failure time appears to be proportional to the intragranular density of theta precipitates, and related to the time required to sweep these from a critical length of line. C1 UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720. RP KIM, C (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 35 TC 33 Z9 33 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1992 VL 72 IS 5 BP 1837 EP 1845 DI 10.1063/1.351655 PG 9 WC Physics, Applied SC Physics GA JK804 UT WOS:A1992JK80400023 ER PT J AU ALVARENGA, AD GRIMSDITCH, M POLIAN, A AF ALVARENGA, AD GRIMSDITCH, M POLIAN, A TI RAMAN-SCATTERING FROM CUBIC BORON-NITRIDE UP TO 1600-K SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HIGH-TEMPERATURES AB Raman scattering measurements on cubic boron nitride up to 1600 K are reported. The results indicate that at 1600 K the interatomic force constant is only approximately 10% weaker than at room temperature and that cubic BN is therefore a good candidate for applications where high-temperature mechanical strength is required. However, contrary to the behavior found for diamond, where the frequency changes with temperature were very nonlinear, it is found that in boron nitride both the TO and LO shift linearly with temperature at a rate of -0.036 cm-1/K. C1 UNIV PARIS 06,F-75252 PARIS 05,FRANCE. RP ALVARENGA, AD (reprint author), ARGONNE NATL LAB,DIV MAT RES,ARGONNE,IL 60439, USA. RI Alvarenga, Ana Paula/M-9790-2014; Polian, Alain/E-1555-2017 OI Polian, Alain/0000-0003-2261-9114 NR 11 TC 15 Z9 15 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1992 VL 72 IS 5 BP 1955 EP 1956 DI 10.1063/1.351671 PG 2 WC Physics, Applied SC Physics GA JK804 UT WOS:A1992JK80400039 ER PT J AU BERNARDEZ, L MCCARTY, KF YANG, N AF BERNARDEZ, L MCCARTY, KF YANG, N TI INSITU RAMAN-SPECTROSCOPY OF DIAMOND DURING GROWTH IN A HOT FILAMENT REACTOR SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; THIN-FILMS; SCATTERING; MICROSCOPY AB We report a system capable of obtaining Raman spectra during growth of carbon films in a hot filament reactor. A gated, multichannel detection system was used to discriminate against the high levels of background radiation produced by the hot substrate and the hot filament. The ability to detect and distinguish between diamond and nondiamond carbon films during growth is shown. Diamond was grown on silicon substrates at 925-degrees-C, with a filament temperature of 2100-degrees-C and with CH4/H2 ratios between 0.002 and 0.008. A nondiamond carbon film was produced with CH4/H2 ratio of 0.016. In order to estimate the sensitivity of the system to detect diamond during growth, the average particle size and fractional coverage of the substrate were determined when a diamond Raman signature was first observed. Currently, the system is capable of detecting diamond particles about 0.5-mu-m. in diameter covering about 3/4 of the surface. RP BERNARDEZ, L (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 21 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1992 VL 72 IS 5 BP 2001 EP 2005 DI 10.1063/1.352330 PG 5 WC Physics, Applied SC Physics GA JK804 UT WOS:A1992JK80400048 ER PT J AU HULL, JR MULCAHY, TM SALAMA, K SELVAMANICKAM, V WEINBERGER, BR LYNDS, L AF HULL, JR MULCAHY, TM SALAMA, K SELVAMANICKAM, V WEINBERGER, BR LYNDS, L TI MAGNETIC-LEVITATION AND STIFFNESS IN MELT-TEXTURED Y-BA-CU-O SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTORS; BULK YBA2CU3OX SUPERCONDUCTOR; CURRENT-DENSITY; GROWTH-PROCESS; FORCE; DEPENDENCE; BEARINGS AB Magnetic levitation and stiffness have been measured in several systems composed of a permanent magnet elastically suspended above a stationary melt-textured sample of Y-Ba-Cu-0. The levitation force and vertical stiffness have been calculated on the basis of magnetization measurements of the same system, and the calculated results showed excellent agreement with the experimental measurements. Based on the force and magnetization measurements, it is predicted that the same Y-Ba-Cu-0 material configured in a geometry suitable for magnetic bearings could produce a levitation pressure of 100-400 kPa at 20 K. C1 UNIV HOUSTON,TEXAS CTR SUPERCOND,HOUSTON,TX 77004. UNITED TECHNOL RES CTR,E HARTFORD,CT 06108. RP HULL, JR (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 17 TC 23 Z9 24 U1 0 U2 7 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 SEP 1 PY 1992 VL 72 IS 5 BP 2089 EP 2091 DI 10.1063/1.351595 PG 3 WC Physics, Applied SC Physics GA JK804 UT WOS:A1992JK80400068 ER PT J AU LIU, ST LEE, LY TAI, CY HUNG, CH CHANG, YS WOLFRAM, JH ROGERS, R GOLDSTEIN, AH AF LIU, ST LEE, LY TAI, CY HUNG, CH CHANG, YS WOLFRAM, JH ROGERS, R GOLDSTEIN, AH TI CLONING OF AN ERWINIA-HERBICOLA GENE NECESSARY FOR GLUCONIC ACID PRODUCTION AND ENHANCED MINERAL PHOSPHATE SOLUBILIZATION IN ESCHERICHIA-COLI HB101 - NUCLEOTIDE-SEQUENCE AND PROBABLE INVOLVEMENT IN BIOSYNTHESIS OF THE COENZYME PYRROLOQUINOLINE QUINONE SO JOURNAL OF BACTERIOLOGY LA English DT Article ID ACINETOBACTER-CALCOACETICUS; PIGMENT GENES; DEHYDROGENASE; EXPRESSION; PLASMIDS; K-12 AB Escherichia coli is capable of synthesizing the apo-glucose dehydrogenase enzyme (GDH) but not the cofactor pyrroloquinoline quinone (PQQ), which is essential for formation of the holoenzyme. Therefore, in the absence of exogenous PQQ, E. coli does not produce gluconic acid. Evidence is presented to show that the expression of an Erwinia herbicola gene in E. coli HB101(pMCG898) resulted in the production of gluconic acid, which, in turn, implied PQQ biosynthesis. Transposon mutagenesis showed that the essential gene or locus was within a 1.8-kb region of a 4.5-kb insert of the plasmid pMCG898. This 1.8-kb region contained only one apparent open reading frame. In this paper, we present the nucleotide sequence of this open reading frame, a 1,134-bp DNA fragment coding for a protein with an M(r) of 42,160. The deduced sequence of this protein had a high degree of homology with that of gene III (M(r), 43,600) of a PQQ synthase gene complex from Acinetobacter calcoaceticus previously identified by Goosen et al. (J. Bacteriol. 171:447-455, 1989). In minicell analysis, pMCG898 encoded a protein with an M(r) of 41,000. These data indicate that E. coli HB101(pMCG898) produced the GDH-PQQ holoenzyme, which, in turn, catalyzed the oxidation of glucose to gluconic acid in the periplasmic space. As a result of the gluconic acid production, E. coli HB101(pMCG898) showed an enhanced mineral phosphate-solubilizing phenotype due to acid dissolution of the hydroxyapatite substrate. C1 CALIF STATE UNIV LOS ANGELES,DEPT BIOL,5151 STATE UNIV,LOS ANGELES,CA 90032. CHANG GUNG MED COLL,DEPT MICROBIOL & IMMUNOL,KWEI SHAN TAOYUAN,TAIWAN. IDAHO NATL ENGN LAB,BIOTECHNOL GRP,IDAHO FALLS,ID 83415. NR 20 TC 70 Z9 78 U1 0 U2 5 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 SEP PY 1992 VL 174 IS 18 BP 5814 EP 5819 PG 6 WC Microbiology SC Microbiology GA JN264 UT WOS:A1992JN26400007 PM 1325965 ER PT J AU JOHNSON, JR GAVRA, Z CHYOU, P REILLY, JJ AF JOHNSON, JR GAVRA, Z CHYOU, P REILLY, JJ TI BEHAVIOR OF HYDRIDED AND DEHYDRIDED LANI5HX AS AN HYDROGENATION CATALYST SO JOURNAL OF CATALYSIS LA English DT Article ID INTERMETALLIC COMPOUNDS; ABSORPTION; KINETICS; SURFACE C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,BLDG 815,UPTON,NY 11973. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. TAIWAN POWER CO,POWER RES INST,TAIPEI,TAIWAN. NR 19 TC 10 Z9 10 U1 1 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD SEP PY 1992 VL 137 IS 1 BP 102 EP 113 DI 10.1016/0021-9517(92)90142-5 PG 12 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JL275 UT WOS:A1992JL27500009 ER PT J AU TALHOUK, RS BISSELL, MJ WERB, Z AF TALHOUK, RS BISSELL, MJ WERB, Z TI COORDINATED EXPRESSION OF EXTRACELLULAR MATRIX-DEGRADING PROTEINASES AND THEIR INHIBITORS REGULATES MAMMARY EPITHELIAL FUNCTION DURING INVOLUTION SO JOURNAL OF CELL BIOLOGY LA English DT Article ID RECONSTITUTED BASEMENT-MEMBRANE; GENE-EXPRESSION; PLASMINOGEN-ACTIVATOR; CELL-DIFFERENTIATION; MOUSE; GLAND; SECRETION; COMPONENTS; TISSUE; METALLOPROTEINASES AB Extracellular matrix (ECM) plays an important role in the maintenance of mammary epithelial differentiation in culture. We asked whether changes in mouse mammary specific function in vivo correlate with changes in the ECM. We showed, using expression of beta-casein as a marker, that the temporal expression of ECM-degrading proteinases and their inhibitors during lactation and involution are inversely related to functional differentiation. After a lactation period of 9 d, mammary epithelial cells maintained beta-casein expression up to 5 d of involution. Two metalloproteinases, 72-kD gelatinase (and its 62-kD active form), and stromelysin, and a serine proteinase tissue plasminogen activator were detected by day four of involution, and maintained expression until at least day 10. The expression of their inhibitors, the tissue inhibitor of metalloproteinases (TTMP) and plasminogen activator inhibitor-1, preceded the onset of ECM-degrading proteinase expression and was detected by day two of involution, and showed a sharp peak of expression centered on days 4-6 of involution. When involution was accelerated by decreasing lactation to 2 d, there was an accelerated loss of beta-casein expression evident by day four and a shift in expression of ECM-remodeling proteinases and inhibitors to a focus at 2-4 d of involution. To further extend the correlation between mammary-specific function and ECM remodeling we initiated involution by sealing just one gland in an otherwise hormonally sufficient lactating animal. Alveoli in the sealed gland contained casein for at least 7 d after sealing, and closely resembled those in a lactating gland. The relative expression of TIMP in the sealed gland increased, whereas the expression of stromelysin was much lower than that of a hormone-depleted involuting gland, indicating that the higher the ratio of TIMP to ECM-degrading proteinases the slower the process of involution. To test directly the functional role of ECM-degrading proteinases in the loss of tissue-specific function we artificially perturbed the ECM-degrading proteinase-inhibitor ratio in a normally involuting gland by maintaining high concentrations of TIMP protein with the use of surgically implanted slow-release pellets. In a concentration-dependent fashion, involuting mammary glands that received TIMP implants maintained high levels of casein and delayed alveolar regression. These data suggest that the balance of ECM-degrading proteinases and their inhibitors regulates the organization of the basement membrane and the tissue-specific function of the mammary gland. During involution an excess of active ECM-degrading proteinases and/or an absence of inhibitors disrupts cell-ECM interaction, leading to loss of differentiated lactational phenotype. C1 LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,RADIOBIOL & ENVIRONM HLTH LAB,SAN FRANCISCO,CA 94143. FU NICHD NIH HHS [HD 23539]; NIEHS NIH HHS [T32ES07106] NR 51 TC 395 Z9 397 U1 0 U2 5 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0021-9525 J9 J CELL BIOL JI J. Cell Biol. PD SEP PY 1992 VL 118 IS 5 BP 1271 EP 1282 DI 10.1083/jcb.118.5.1271 PG 12 WC Cell Biology SC Cell Biology GA JL550 UT WOS:A1992JL55000023 PM 1512297 ER PT J AU CAMPION, SR TADAKI, DK NIYOGI, SK AF CAMPION, SR TADAKI, DK NIYOGI, SK TI EVALUATION OF THE ROLE OF ELECTROSTATIC RESIDUES IN HUMAN EPIDERMAL GROWTH-FACTOR BY SITE-DIRECTED MUTAGENESIS AND CHEMICAL MODIFICATION SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Article DE HEGF; IONIC RESIDUES; SITE-DIRECTED MUTAGENESIS; CHEMICAL MODIFICATION; RECEPTOR AFFINITY ID NUCLEAR-MAGNETIC-RESONANCE; RECEPTOR-BINDING; FACTOR-ALPHA; MURINE; LEUCINE-47; PROTEIN; H-1-NMR AB Four residues in the carboxy-terminal domain of human epidermal growth factor (hEGF), glutamate 40, glutamine 43, arginine 45, and aspartate 46 were targeted for site-directed mutagenesis to evaluate their potential role in epidermal growth factor (EGF) receptor-ligand interaction. One or more mutations were generated at each of these sites and the altered recombinant hEGF gene products were purified and evaluated by radioreceptor competition binding assay. Charge-conservative replacement of glutamate 40 with aspartate resulted in a decrease in receptor binding affinity to 30% relative to wild-type hEGF. On the other hand, removal of the electrostatic charge by substitution of glutamate 40 with glutamine or alanine resulted in only a slightly greater decrease in receptor binding to 25% relative receptor affinity. The introduction of a positive charge upon substitution of glutamine 43 with lysine had no effect on receptor binding. The substitution of arginine 45 with lysine also showed no effect on receptor binding, unlike the absolute requirement observed for the arginine side-chain at position 41 [Engler DA, Campion SR, Hauser MR, Cook JS, Niyogi, SK: J Biol Chem 267:2274-2281, 1992]. Subsequent elimination of the positive charge of lysine 45 by reaction with potassium cyanate showed that the electrostatic property of the residue at this site, as well as that at lysine 28 and lysine 48, was not required for receptor-ligand association. The most highly conserved of the four residues studied in this report, aspartate 46, was replaced with alanine, tyrosine, and arginine, resulting in a decrease in relative receptor affinity to 23, 14, and 4 percent, respectively, and suggests the importance of an acidic group at this site of EGF. The ability to generate sufficient yields of mutant recombinant EGF protein was sensitive to the type of side-chain substitutions generated at the sites described in this report and may indicate a role for these residues in the formation of the EGF structure apparently required for productive yields of EGF proteins in the expression system used in this study. C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,PROT ENGN & MOLEC MUTAGENESIS PROGRAM,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831. FU NCI NIH HHS [CA 50735] NR 23 TC 21 Z9 22 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 SEP PY 1992 VL 50 IS 1 BP 35 EP 42 PG 8 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA JL751 UT WOS:A1992JL75100005 PM 1358899 ER PT J AU PRATT, ST DEHMER, PM DEHMER, JL AF PRATT, ST DEHMER, PM DEHMER, JL TI CONSTANT-IONIC-STATE SPECTROSCOPY OF HIGH-V RYDBERG STATES OF MOLECULAR-HYDROGEN SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID QUANTUM-DEFECT THEORY; PHOTOELECTRON ANGULAR-DISTRIBUTIONS; ROTATIONAL-VIBRATIONAL PREIONIZATION; ENHANCED MULTIPHOTON IONIZATION; BRANCHING RATIOS; HIGH-RESOLUTION; EXCITED-STATES; H-2; H2; AUTOIONIZATION AB The (X 2-SIGMA(g)+)np Rydberg states converging to the X 2-SIGMA(g)+, v+ greater-than-or-equal-to 9 ionization threshold of molecular hydrogen were excited by double-resonance excitation via the E,F 1-SIGMA(g)+, v = 6 level. The energy region of interest ( 1 39 500-140 000 cm-1) included the X 2-SIGMA(g)+, v+ = 9, N+ = 0-3 ionization thresholds as well as the energetic threshold for ion pair formation. The decay of the autoionizing Rydberg states was studied by both conventional and constant-ionic-state photoelectron spectrometry. The results support the DELTA-v = minimum propensity rule for vibrational autoionization of Rydberg states with a high level of vibrational excitation. However, the relative intensities of the (X 2-SIGMA(g)+)np, v' greater-than-or-equal-to 9 Rydberg series converging to different rotational levels of the ion are dramatically different from those for the analogous.Rydberg series with v' less-than-or-equal-to 2. In addition, the two-color photoelectron spectrum via the EF 1-SIGMA(g)+, v = 6 level shows considerable intensity in the v+ = 7 and 8 photoelectron bands both on and off resonance, in marked contrast with the single-color photoelectron spectrum obtained for the same intermediate levels. These observations may be due to the dependence of the transition dipole matrix elements on the internuclear distance and to the presence of doubly excited electronic states that cross the H-2+ X 2-SIGMA(g)+ potential curve at a total energy close to that accessed by the two-color excitation scheme. RP PRATT, ST (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 48 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1992 VL 97 IS 5 BP 3038 EP 3049 DI 10.1063/1.463045 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL372 UT WOS:A1992JL37200021 ER PT J AU SAPERS, SP HESS, WP AF SAPERS, SP HESS, WP TI PHOTODISSOCIATION OF BRCH2CH2OH AND ICH2CH2OH - FORMATION AND CHARACTERIZATION OF OH(X2-PI) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LASER-INDUCED FLUORESCENCE; ACETIC-ACID; NM; PHOTOLYSIS; BARRIER; OH AB This work studies the dissociation of BrCH2 CH2 OH and ICH2 CH2 OH following laser excitation to the electronic A state. The direct subpicosecond dissociation cleaves the C-X bond to produce CH2 CH2 OH and the halogen atom in either the ground (P-2(3/2)) or excited (P-2(1/2)) State. The initial dissociation produces excited CH2 CH2 OH in a distribution of internal states, some of which have sufficient energy to undergo secondary, nonphotoinduced dissociation to form OH and C2H4. We probe the OH translational and rotational product states following this secondary dissociation using laser-induced fluorescence in both flow cell and pulsed jet apparatus. Excitation of BrCH2 CH2 OH at 202 nm produces OH with no vibrational excitation and a non-Boltzmann rotational distribution with an average rotational energy of 8 kJ/mol. Doppler analysis of the rotational line shape shows that a majority of the energy available for the secondary dissociation is partitioned into relative translation of OH and C2H4. Excitation of ICH2 CH, OH at 266 nm also produces OH, but at much lower quantum yields due to energetic constraints. We find that the CH2 CH2 OH radical also absorbs at 266 nm to produce OH. The rotational and translational energy distribution of OH from secondary dissociation of the CH2 CH2 OH radical is described qualitatively by a simple rotational model. RP SAPERS, SP (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 26 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1992 VL 97 IS 5 BP 3126 EP 3134 DI 10.1063/1.463000 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL372 UT WOS:A1992JL37200029 ER PT J AU MICHAEL, JV LIM, KP AF MICHAEL, JV LIM, KP TI RATE CONSTANTS FOR THE N2O REACTION SYSTEM - THERMAL-DECOMPOSITION OF N2O N+NO-]N2+O AND IMPLICATIONS FOR O+N2-]NO+N SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TEMPERATURE REACTION-RATE; SHOCK-TUBE TECHNIQUE; RATE COEFFICIENT; ATOMS; NO; PHOTOLYSIS; DISSOCIATION; H+O2->OH+O; D+O2->OD+O; STATE AB Experiments on the thermal decomposition of N2O have been carried out in reflected shock waves using the atomic resonance absorption spectrometric (ARAS) technique for monitoring the product 0 atoms. The results provide a calibration for the ARAS system as well as values for the decomposition rate constant, k1, between 1540 and 2500 K. The present results can be represented as k1 = 5.25X10(-10) exp(-27 921 K/T) cm3 molecule-1 s-1. Additionally, rate constants for the reaction, (2) N + NO --> N2 + O, have been measured by the laser photolysis-shock tube (LP-ST) technique between 1251 and 3152 K. NO serves as both the photolytic source of N(4S) atoms and the reactant molecule. N atoms are monitored by the ARAS method. The results do not show significant temperature dependence and can be represented by k2 = (3.7+/-0.8)X10(-11) cm3 molecule-1 s-1 over the experimental temperature range. Values for the reaction, (-2) O + N2 --> NO + N, can be derived from these results. The results are compared with earlier studies and are then theoretically discussed in terms of transition states taken from an ab initio electronic structure calculation and also from a dispersion force model. Neither model accurately predicts the observed behavior, and this suggests that further theoretical work with trajectory calculations be attempted to assess the importance of recrossing. RP MICHAEL, JV (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Michael, Joe/E-3907-2010 NR 37 TC 53 Z9 53 U1 1 U2 11 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 SEP 1 PY 1992 VL 97 IS 5 BP 3228 EP 3234 DI 10.1063/1.463009 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL372 UT WOS:A1992JL37200040 ER PT J AU STAVE, MS DEPRISTO, AE AF STAVE, MS DEPRISTO, AE TI THE STRUCTURE OF NIN AND PDN CLUSTERS - 4-LESS-THAN-OR-EQUAL-TO-N-LESS-THAN-OR-EQUAL-TO-23 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CORRECTED EFFECTIVE-MEDIUM; EMBEDDED-ATOM-METHOD; TRANSITION-METAL CLUSTERS; NICKEL CLUSTERS; HYDROGEN CHEMISORPTION; BODY FORMULATION; REACTION-PATH; POTENTIALS; CU; RELAXATION AB Stable geometrical structures of Ni(N) and Pd(N) clusters (N = 4-23) are identified using a corrected effective medium (CEM) theory. Structural optimization is accomplished by simulated annealing using analytic derivatives to determine the interatomic forces. Unique structural features of these metal clusters are noted, especially in relation to the bulk and surface phases of these metals and to structures commonly associated with rare gas clusters. Elucidation of the general features of cluster growth leads to the principle that transition metal clusters generally maximize the minimum coordination of any atom. By contrast, rare gas clusters maximize the number of interatomic distances close to the optimal distance for the pairwise interaction between rare gas atoms. The latter can be interpreted as the packing of hard balls. Structural transformations between isomers of similar energy are also examined for selected sizes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP STAVE, MS (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 48 TC 157 Z9 159 U1 0 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 SEP 1 PY 1992 VL 97 IS 5 BP 3386 EP 3398 DI 10.1063/1.462975 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL372 UT WOS:A1992JL37200059 ER PT J AU JENSEN, P ROHLFING, CM ALMLOF, J AF JENSEN, P ROHLFING, CM ALMLOF, J TI CALCULATION OF THE COMPLETE-ACTIVE-SPACE SELF-CONSISTENT-FIELD POTENTIAL-ENERGY SURFACE, THE DIPOLE-MOMENT SURFACES, THE ROTATION VIBRATION ENERGIES, AND THE VIBRATIONAL TRANSITION MOMENTS FOR C3(X)OVER-TILDE1-SIGMA-G+ SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EMISSION PUMPING SPECTROSCOPY; LASER-INDUCED-FLUORESCENCE; SEMIRIGID BENDER ANALYSIS; NONRIGID BENDER; CARBON SUBOXIDE; TRIATOMIC-MOLECULES; RIGID BENDER; INFRARED FREQUENCIES; VARIATIONAL APPROACH; INTERNAL DYNAMICS AB The present work reports an ab initio calculation of the potential-energy surface and corresponding dipole moment surfaces for the C3 molecule employing the full valence complete-active-space self-consistent-field method with a very large basis set. On the basis of the ab initio results we have calculated the rotation-vibration energies in the lower part of the energy spectrum with the MOR.BID (Morse oscillator rigid bender internal dynamics) method, and we find that the present ab initio potential-energy surface reproduces qualitatively the variation of the bending energy-level pattern with excitation of the stretching modes. We conclude from the ab initio results obtained in the present work, and from a fitting to experimental data carried out with the MORBID Computer program, that the equilibrium structure of C3 is linear. We have used the ab initio dipole moment calculated in the present work to compute the vibrational transition moments for selected vibrational transitions of C-12(3), obtaining transition moments of 0.44 and 0.35 D, respectively, for the nu-2 and nu-3 bands. The ab initio dipole moment values have further been used to calculate the line strengths, integrated absorption coefficients, and peak absorption coefficients of the low-J transitions in the nu-2 and nu-3 bands; the results of the theoretical intensity calculation are in keeping with recent experimental observations. C1 SANDIA NATL LABS,DIV THEORET,LIVERMORE,CA 94551. UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,MINNESOTA SUPERCOMP INST,MINNEAPOLIS,MN 55455. RP JENSEN, P (reprint author), UNIV GIESSEN,INST PHYS CHEM,HEINRICH BUFF RING 58,W-6300 GIESSEN,GERMANY. NR 49 TC 38 Z9 38 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1992 VL 97 IS 5 BP 3399 EP 3411 DI 10.1063/1.462976 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL372 UT WOS:A1992JL37200060 ER PT J AU CALLEN, BW GRIFFITHS, K KASZA, RV JENSEN, MB THIEL, PA NORTON, PR AF CALLEN, BW GRIFFITHS, K KASZA, RV JENSEN, MB THIEL, PA NORTON, PR TI STRUCTURAL PHENOMENA RELATED TO ASSOCIATIVE AND DISSOCIATIVE ADSORPTION OF WATER ON NI(110) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STIMULATED DESORPTION; H2O ADSORPTION; OXYGEN; SURFACES; HYDROGEN; PD(100) AB The adsorption of water on Ni (110) has been studied by thermal desorption spectroscopy (TDS), work function (DELTA-PHI), Fourier transform infrared reflection-absorption spectroscopy (FTIR-RAS), low energy electron diffraction (LEED), and electron-stimulated desorption ion angular distribution (ESDIAD). The major findings of this study are the following: (1) Water molecules in the chemisorbed c(2 X 2) half-monolayer do not cluster and the plane of the molecules is highly inclined to the surface normal; (2) no ESDIAD evidence of oriented water dimers is observed at 130 K and no FTIR activity is observed following adsorption at 80 K until multilayers are populated; (3) water has been measured to partially dissociate at a minimum temperature of 205 +/- 2 K; (4) the binding energy of water to the Ni (110) surface is increased by H-bonding to adsorbed hydroxyls (produced by the partial dissociation) in a linear OH(ad)/H2O complex with planar symmetry in the [001] direction. This bonding results in a higher temperature desorption state (A1). C1 UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP CALLEN, BW (reprint author), UNIV WESTERN ONTARIO,INTERFACE SCI WESTERN,LONDON N6A 5B7,ONTARIO,CANADA. NR 25 TC 34 Z9 34 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1992 VL 97 IS 5 BP 3760 EP 3774 DI 10.1063/1.462957 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JL372 UT WOS:A1992JL37200096 ER PT J AU TAYLOR, KE GHAN, SJ AF TAYLOR, KE GHAN, SJ TI AN ANALYSIS OF CLOUD LIQUID WATER FEEDBACK AND GLOBAL CLIMATE SENSITIVITY IN A GENERAL-CIRCULATION MODEL SO JOURNAL OF CLIMATE LA English DT Article ID OPTICAL-THICKNESS FEEDBACKS; RADIATION BUDGET EXPERIMENT; ATMOSPHERIC SULFUR; CO2; PARAMETERIZATION; ALBEDO; PHYTOPLANKTON; PREDICTION; SCHEME AB A set of general circulation model simulations is analyzed to determine how cloud distribution and cloud radiative properties might change as climate warms and to isolate and quantify the various feedback effects of clouds on climate sensitivity. For this study the NCAR Community Climate Model (CCM1) was modified so that the cloud radiative properties (albedo, emissivity, and absorptivity) are no longer prescribed, but are functions of the cloud liquid water content. Following the Cess and Potter approach for estimating climate sensitivity, we consider results from two sets of simulations. In one set, cloud liquid water is diagnosed from the simulated condensation rate and thus is free to vary with condensation, while in the other set, the cloud liquid water content is a fixed field (dependent only on altitude and latitude) that is obtained by averaging the results of the first set of experiments. The experiments make it possible to isolate the effects of cloud liquid water feedback. We find that changes in cloud amount, cloud liquid water content, and cloud distribution (especially in the vertical) are all of comparable importance, but some of these changes provide a positive feedback while others provide a negative feedback. Separation of cloud feedback into individual components makes it clear that in this model as climate warms the general increase in the liquid water content of each cloud layer is partially offset by an upward shift in cloud altitude. The effects of clouds on longwave radiation also generally tend to cancel the effects on shortwave radiation. Consequently, the net cloud feedback represents a residual of several offsetting effects, which nevertheless is large enough to nearly double the sensitivity of the simulated climate. Another important conclusion is that it is impossible to parameterize cloud albedo in terms of average cloud liquid water content because the average liquid water is dominated by the thicker clouds, whereas the average albedo depends on clouds with relatively little liquid water as well. RP TAYLOR, KE (reprint author), LAWRENCE LIVERMORE NATL LAB,L-264,POB 808,LIVERMORE,CA 94550, USA. RI Taylor, Karl/F-7290-2011; Ghan, Steven/H-4301-2011 OI Taylor, Karl/0000-0002-6491-2135; Ghan, Steven/0000-0001-8355-8699 NR 41 TC 35 Z9 37 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8755 J9 J CLIMATE JI J. Clim. PD SEP PY 1992 VL 5 IS 9 BP 907 EP 919 DI 10.1175/1520-0442(1992)005<0907:AAOCLW>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KF432 UT WOS:A1992KF43200002 ER PT J AU SOKALSKI, WA SHIBATA, M ORNSTEIN, RL REIN, R AF SOKALSKI, WA SHIBATA, M ORNSTEIN, RL REIN, R TI CUMULATIVE ATOMIC MULTIPOLE MOMENTS COMPLEMENT ANY ATOMIC CHARGE MODEL TO OBTAIN MORE ACCURATE ELECTROSTATIC PROPERTIES SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID DISTRIBUTED MULTIPOLE; MOLECULES; REPRESENTATION; POTENTIALS; DEPENDENCE; DENSITIES AB The quality of several atomic charge models based on different definitions has been analyzed using cumulative atomic multipole moments (CAMM). This formalism can generate higher atomic moments starting from any atomic charges, while preserving the corresponding molecular moments. The atomic charge contribution to the higher molecular moments, as well as to the electrostatic potentials, has been examined for CO and HCN molecules at several different levels of theory. The results clearly show that the electrostatic potential obtained from CAMM expansion is convergent up to the R-5 term for all atomic charge models used. This illustrates that higher atomic moments can be used to supplement any atomic charge model to obtain more accurate description of electrostatic properties. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. INST ORGAN & PHYS CHEM 14, PL-50370 WROCLAW, POLAND. RP REIN, R (reprint author), ROSWELL PK CANC INST, DEPT BIOPHYS, BUFFALO, NY 14263 USA. RI Sokalski, Waclaw/I-6151-2012 FU NIDCR NIH HHS [DE-AC06-76RLO 1830, DE-AMPb-76-RLO-2225] NR 36 TC 20 Z9 20 U1 0 U2 6 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD SEP PY 1992 VL 13 IS 7 BP 883 EP 887 DI 10.1002/jcc.540130713 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA JJ195 UT WOS:A1992JJ19500012 PM 11538053 ER PT J AU KOSOWER, DA AF KOSOWER, DA TI OCTOPUS - AN EFFICIENT PHASE-SPACE MAPPING FOR LIGHT PARTICLES SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID QCD C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 10 TC 0 Z9 0 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 SEP PY 1992 VL 102 IS 1 BP 18 EP 38 DI 10.1016/S0021-9991(05)80002-6 PG 21 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JK559 UT WOS:A1992JK55900002 ER PT J AU PROCASSINI, RJ COHEN, BI AF PROCASSINI, RJ COHEN, BI TI A COMPARISON OF PARTICLE-IN-CELL AND FOKKER-PLANCK METHODS AS APPLIED TO THE MODELING OF AUXILIARY-HEATED MIRROR PLASMAS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID COULOMB COLLISIONAL PLASMA; SIMULATION-MODEL; TRANSPORT C1 UNIV CALIF BERKELEY, ELECTR RES LAB, BERKELEY, CA 94720 USA. LAWRENCE LIVERMORE NATL LAB, MAGNET FUS ENERGY PROGRAM, LIVERMORE, CA 94550 USA. NR 16 TC 3 Z9 3 U1 0 U2 1 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD SEP PY 1992 VL 102 IS 1 BP 39 EP 48 DI 10.1016/S0021-9991(05)80003-8 PG 10 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JK559 UT WOS:A1992JK55900003 ER PT J AU ZHU, JY SETHIAN, J AF ZHU, JY SETHIAN, J TI PROJECTION METHODS COUPLED TO LEVEL SET INTERFACE TECHNIQUES SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID NAVIER-STOKES EQUATIONS; CONSERVATION-LAWS; ALGORITHMS; CURVATURE; APPROXIMATIONS; FRONTS C1 UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. RP ZHU, JY (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 17 TC 48 Z9 49 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 SEP PY 1992 VL 102 IS 1 BP 128 EP 138 DI 10.1016/S0021-9991(05)80011-7 PG 11 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JK559 UT WOS:A1992JK55900011 ER PT J AU LYSTER, PM LEBOEUF, JN AF LYSTER, PM LEBOEUF, JN TI A FLUID-ION AND PARTICLE-ELECTRON MODEL FOR LOW-FREQUENCY PLASMA INSTABILITIES SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID DRIFT WAVE TURBULENCE; SIMULATION-MODEL; HYBRID SIMULATION; TOKAMAKS; DYNAMICS C1 UNIV TEXAS,INST FUS STUDIES,AUSTIN,TX 78712. OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830. NR 39 TC 7 Z9 7 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD SEP PY 1992 VL 102 IS 1 BP 180 EP 193 DI 10.1016/S0021-9991(05)80014-2 PG 14 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JK559 UT WOS:A1992JK55900014 ER PT J AU WILLIAMSON, DL DRAKE, JB HACK, JJ JAKOB, R SWARZTRAUBER, PN AF WILLIAMSON, DL DRAKE, JB HACK, JJ JAKOB, R SWARZTRAUBER, PN TI A STANDARD TEST SET FOR NUMERICAL APPROXIMATIONS TO THE SHALLOW-WATER EQUATIONS IN SPHERICAL GEOMETRY SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID TRANSPORT; MODEL C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WILLIAMSON, DL (reprint author), NATL CTR ATMOSPHER RES,BOULDER,CO 80307, USA. NR 34 TC 459 Z9 473 U1 3 U2 19 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 SEP PY 1992 VL 102 IS 1 BP 211 EP 224 DI 10.1016/S0021-9991(05)80016-6 PG 14 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JK559 UT WOS:A1992JK55900016 ER PT J AU MORITZ, KM CLEMONS, G TANGALAKIS, K WINTOUR, EM AF MORITZ, KM CLEMONS, G TANGALAKIS, K WINTOUR, EM TI THE EFFECT OF CHRONIC AND ACUTE HEMORRHAGE ON ERYTHROPOIETIN IN THE NEONATAL LAMB SO JOURNAL OF DEVELOPMENTAL PHYSIOLOGY LA English DT Article ID RECOMBINANT-HUMAN-ERYTHROPOIETIN; IMMUNOREACTIVE ERYTHROPOIETIN; FETAL BLOOD; ANEMIA; PREMATURITY; OXYGEN; KIDNEY; LIVER; CELLS; HEMORRHAGE AB In all mammalian species studied the haematocrit (hct) declines after birth in the absence of any known nutritional deficiencies. The glycoprotein hormone, erythropoietin (Epo), is essential for normal red blood cell production. The aims of this study were 1) to investigate the changes in plasma Epo during the normal post-natal decrease in hct in lambs; 2) to compare the effects of chronic and acute haemorrhage in neonatal lambs; and 3) to test the hypothesis that the Epo response to haemorrhage is blunted in the neonatal period. Twenty-one lambs (0-9 weeks of age) were studied; group I (n=8) were used to document normal post-natal changes (98 samples); group II (n=7) lambs were haemorrhaged repetitively during weeks 3-6 (95 samples); group III (n=6) lambs were bled once in the first 3-week period. In the group I (control lambs) the hct decreased from 30.6 +/- 1.3 (weeks 1 & 2) to a nadir of 23.2 +/- 0.8 (75.8% of initial value) in the 6th week, and the plasma Epo declined from 25.7 +/- 4.9 (week 1) to 12.3 +/- 1.0 mU/ml (week 6). In group II, the lambs were bled repetitively, a total of 510 +/- 32 ml blood being removed during weeks 3-6, the hct was 18.7 +/- 0.8 (81% of hct at nadir in controls) in week 6, and Epo was 26.9 +/- 13.3 in week 3, 23.4 +/- 3.6 mU/ml in week 6. In group III animals an acute haemorrhage of 2% body weight at 11.2 +/- 1.7 days reduced the hct to 77 +/- 1% of initial values, at 24h, and increased the Epo from 17 +/- 6.1 to 57.8 +/- 19 mU/ml. In 5 of the group II lambs, by contrast, the removal of blood equivalent to 2% of body weight during week 6, during the chronic anaemia period, reduced the hct from 21.7 +/- 1.5 to 16.5 +/- 1.0%, (to 76%) when the plasma Epo values were respectively 15.4 +/- 2.9 and 25.1 +/- 5.0 mU/ml. Thus, although an acute reduction in hct, to 75% of initial, in the first 3 weeks after birth, produces an appropriate increase in plasma Epo, a similar magnitude of decrease, occurring over weeks 3-6, is accompanied by a decrease in plasma Epo. Chronic haemorrhage, in weeks 3-6, prevents the fall in plasma Epo, but an acute haemorrhage in week 6 does not further increase plasma Epo. Thus Epo production becomes relatively insensitive to decreasing hct during this period. C1 UNIV MELBOURNE,HOWARD FLOREY INST EXPTL PHYSIOL & MED,PARKVILLE,VIC 3052,AUSTRALIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Moritz, Karen/G-2508-2015 OI Moritz, Karen/0000-0002-8085-0034 NR 49 TC 9 Z9 9 U1 0 U2 0 PU CAXTON COMMUNICATIONS PI BUCKS PA ATTN: TINA CLARKE BUCKS, ENGLAND HP13 5HG ESS CENTRE BELLFIELD ROAD, SN 0141-9846 J9 J DEV PHYSIOL JI J. Dev. Physiol. PD SEP PY 1992 VL 18 IS 3 BP 129 EP 136 PG 8 WC Developmental Biology; Physiology SC Developmental Biology; Physiology GA LY484 UT WOS:A1992LY48400006 PM 1338733 ER PT J AU VENKATASUBRAMANIAN, R TIMMONS, ML COLPITTS, TS ASHER, S AF VENKATASUBRAMANIAN, R TIMMONS, ML COLPITTS, TS ASHER, S TI PROPERTIES AND USE OF CYCLED GROWN OMVPE GAASZN, GAASSE, AND GAASSI LAYERS FOR HIGH-CONDUCTANCE GAAS TUNNEL-JUNCTIONS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE GAAS TUNNEL JUNCTIONS; OMVPE; CYCLED GROWTH ID COMPENSATION MECHANISMS; GALLIUM-ARSENIDE; DIFFUSION; PRESSURE AB Heavily doped GaAs layers for high conductance GaAs tunnel junctions have been grown by atmospheric pressure organometallic vapor phase epitaxy (OMVPE) using Zn as the dopant for the p+ regions and either Se or Si as the dopant for the n+ regions. At a growth temperature of 700-degrees-C using a "cycled" growth technique for the Zn-doped p++-GaAs layer, both the conductance and the peak current density of the tunnel diode has been increased by a factor of approximately 65 compared to a tunnel junction with a continuously grown Zn-doped p+-GaAs. The conductance of the tunnel junction, which is maximized at a growth temperature of 650-degrees-C using cycled growth, is comparable to the best reported values for tunnel junctions grown by molecular beam epitaxy. Cycled growths for n+ Se-doped regions are found to reduce the conductance of a tunnel junction by more than two orders of magnitude. However, cycled growth for the n+-GaAs regions with Si doping show no conductance degradation. A model based on incorporation sites of these dopants during OMVPE growth of GaAs is presented to account for the experimental observations. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP VENKATASUBRAMANIAN, R (reprint author), RES TRIANGLE INST,RES TRIANGLE PK,NC 27709, USA. NR 14 TC 3 Z9 3 U1 0 U2 3 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 SEP PY 1992 VL 21 IS 9 BP 893 EP 899 DI 10.1007/BF02665546 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA JN294 UT WOS:A1992JN29400005 ER PT J AU RAO, MV GULWADI, SM MULPURI, S SIMONS, DS CHI, PH CANEAU, C HONG, WP HOLLAND, OW DIETRICH, HB AF RAO, MV GULWADI, SM MULPURI, S SIMONS, DS CHI, PH CANEAU, C HONG, WP HOLLAND, OW DIETRICH, HB TI CO-IMPLANTS, FE-IMPLANTS, AND TI-IMPLANTS IN INGAAS AND CO-IMPLANTS IN INP AT 200-DEGREES-C SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE INP; INGAAS; IMPLANTATION; ANNEALING ID RUTHERFORD BACKSCATTERING; COMPOUND SEMICONDUCTORS; ANNEALING BEHAVIOR; REDISTRIBUTION; GAAS; IN0.53GA0.47AS; MANGANESE; DIFFUSION; CHROMIUM; ENERGY AB Elevated temperature (200-degrees-C) single- and multiple-energy Co implants in n-type InP, Co and Fe implants in n-type In0.53Ga0.47As, and Ti implants in p-type In0.53Ga0.47As were performed. For elevated temperature, single-energy Co and Fe implants, no satellite peaks at various locations like 0.8 R(P), R(P) + DELTA-R(P), and 2R(P) (R(P) is the projected range and DELTA-R(P) the straggle of the implant) are observed, in contrast to the case of room temperature implants. However, the outdiffusion of the implant is as severe as that in room temperature implantation for high temperature anneals. Indiffusion of the implant also occurs, but it is not as severe as the outdiffusion. High temperature annealing of Ti-implanted material results in a slight indiffusion of Ti, with minimal redistribution or outdiffusion. For all elevated temperature implants, the lattice quality of the annealed material is close to that of the virgin unimplanted material. For all ion species used in this study, resistivities close to the intrinsic limit are obtained in the implanted and annealed materials. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BELLCORE,RED BANK,NJ 07701. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. USN,RES LAB,WASHINGTON,DC 20375. RP RAO, MV (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 25 TC 8 Z9 8 U1 0 U2 3 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 SEP PY 1992 VL 21 IS 9 BP 923 EP 928 DI 10.1007/BF02665550 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA JN294 UT WOS:A1992JN29400009 ER PT J AU LINKER, JA VANHOVEN, G MCCOMAS, DJ AF LINKER, JA VANHOVEN, G MCCOMAS, DJ TI SIMULATIONS OF CORONAL DISCONNECTION EVENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INTERPLANETARY MAGNETIC-FIELD; SOLAR-WIND; GEOMAGNETIC TAIL; MASS EJECTIONS; TEARING MODE; RECONNECTION; PLASMOIDS; FLARES AB The lack of evidence for magnetic disconnection of coronal mass ejections (CMEs) from the Sun has long been a puzzle, as it implies a buildup of the interplanetary magnetic field (IMF) magnitude over time. Such a buildup is ruled out by observations. Magnetic reconnection above helmet streamer configurations could provide a mechanism for maintaining the observed relative constancy of the IMF [McComas et al., 1989]; McComas et al. [1991] showed observational evidence of reconnection above a streamer. We investigate this interpretation using time-dependent MHD simulations. We model the opening of new magnetic flux on the Sun (as might occur in a CME or other transient event) as an increase in magnetic flux at the poles of a simulated corona. We find that this perturbation can in fact cause reconnection above an equatorial helmet streamer, and the resultant density signature is similar to the observations of McComas et al. [1991]. C1 LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545. RP LINKER, JA (reprint author), UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717, USA. NR 26 TC 6 Z9 6 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 SEP 1 PY 1992 VL 97 IS A9 BP 13733 EP 13740 DI 10.1029/92JA00443 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JM026 UT WOS:A1992JM02600005 ER PT J AU VU, HX BRACKBILL, JU WINSKE, D AF VU, HX BRACKBILL, JU WINSKE, D TI MULTIPLE SWITCH-OFF SLOW SHOCK SOLUTIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID DISTANT GEOMAGNETIC TAIL; SHEET BOUNDARY-LAYER; MODE SHOCKS; SOLAR-WIND; INTERMEDIATE SHOCKS; PLASMA; MAGNETOTAIL; WAVES; INSTABILITY; SIMULATION AB Numerical simulations of the slow-mode switch-off shock with a time-dependent, implicit hybrid plasma simulation code in a bounded domain produce more than one type of internal structure for the same physical parameters, depending on the downstream boundary conditions. Time-steady switch-off slow shocks with large-amplitude trailing waves are obtained with downstream boundaries that either allow incoming ion cyclotron waves or set the magnetic field component transverse to the shock normal equal to zero. Time-steady switch-off slow shocks with no trailing waves are obtained with downstream boundaries that set he electric field according to E(d) = -u(d) X B(d) (u(d) and B(d) are the downstream plasma fluid velocity and the downstream magnetic field, respectively, and are obtained for given upstream conditions by solving the Rankine-Hugoniot relations); for example, the electric field is set to zero for simulations performed in the rest frame of the downstream plasma. Both switch-off slow shocks with and without trailing waves satisfy the Rankine-Hugoniot conditions. Shocks with trailing wave trains are stable to changes in the downstream boundary conditions. Although both shocks with and without the trailing wave trains are linearly stable with respect to changes in the upstream magnetic field, only shocks with no trailing wave trains are nonlinearly stable. These results may explain observations of slow shocks in the magnetotail in which the expected trailing wave train is absent. RP VU, HX (reprint author), LOS ALAMOS NATL LAB,MAIL STOP B216,T-3,LOS ALAMOS,NM 87545, USA. NR 43 TC 13 Z9 13 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 SEP 1 PY 1992 VL 97 IS A9 BP 13839 EP 13852 DI 10.1029/92JA00921 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JM026 UT WOS:A1992JM02600014 ER PT J AU LAM, QH JEFFRIES, CD BEHROOZ, A BRICENO, G ZETTL, A AF LAM, QH JEFFRIES, CD BEHROOZ, A BRICENO, G ZETTL, A TI THE COMPLEX PERMEABILITY AND HARMONIC-GENERATION OF A BI2SR2CACU2O8-Y CRYSTAL - MEASUREMENTS AND MODELS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; BA-CU-O; YBA2CU3O7; STATE; TC AB For a single crystal of Bi2Sr2CaCu2O8-y at 77 K and subject to simultaneous ac and dc magnetic fields, measurements are reported for the complex ac permeability (mu'-imu") end for the generated harmonic power P(nf). A plot of mu" versus log10(H(ac)) shows one peak at H(ac)=5.2 Oe, which is interpreted as the penetration field H* in a critical state model. This result corresponds to only one component of the supercurrent, in contrast to both inter- and intragranular components generally observed in YBa2Cu3O7-delta. The observed dependence of mu', mu" and P(nf) on H(dc) and H(ac) are only moderately well explained by a generalized critical state model. C1 UNIV CALIF BERKELEY,DEPT PHYS,ROOM 366,LECONTE HALL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD SEP PY 1992 VL 115 IS 2-3 BP 197 EP 203 DI 10.1016/0304-8853(92)90056-T PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JV022 UT WOS:A1992JV02200015 ER PT J AU NAN, C ROTHMAN, SJ ROUTBORT, JL GORETTA, KC AF NAN, C ROTHMAN, SJ ROUTBORT, JL GORETTA, KC TI TRACER DIFFUSION OF BA AND Y IN YBA2CU3OX SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID OXYGEN; SUPERCONDUCTIVITY; SUBSTITUTION; TRANSPORT; SAMPLES; CREEP; SITE; SM; EU; GD AB Tracer self-diffusion of Ba and Y and the diffusion of Dy, Ho, and Gd, which substitute for Y, have been measured in polycrystalline YBa2Cu3Ox over temperature and oxygen partial pressure ranges of 850 to 980-degrees-C and 10(3) to 10(5) Pa, respectively. The diffusion of Ba is slower than that of oxygen or copper, with a high activation energy of about 890 +/- 80 kJ/mole. Large anisotropy has also been observed, with diffusion along the c-axis being more than three orders of magnitude slower than diffusion in randomly oriented polycrystals. Diffusion coefficients of Ba were, within experimental uncertainty, independent of oxygen partial pressure over the range measured. The diffusion coefficients of the Y-site species were nearly identical and an activation energy of about 1.0 MJ/mole was estimated, in agreement with that for high-temperature deformation. Attempts to speed up the kinetics through creation of point defects on the Y site by doping proved to be unsuccessful. These results are compared to cation diffusion in cubic perovskites and simple oxides. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. RP NAN, C (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 51 TC 0 Z9 0 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 SEP PY 1992 VL 7 IS 9 BP 2308 EP 2316 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500002 ER PT J AU SINGH, JP GUTTSCHOW, RA DUSEK, JT POEPPEL, RB AF SINGH, JP GUTTSCHOW, RA DUSEK, JT POEPPEL, RB TI ROLE OF PO2 IN MICROSTRUCTURAL DEVELOPMENT AND PROPERTIES OF YBA2CU3OX SUPERCONDUCTORS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID MECHANICAL-PROPERTIES; SILVER; STABILITY; PHASE AB An evaluation of the effects of oxygen partial pressure (p(O2)) on sintering behavior and the resulting microstructure of YBa2Cu3Ox (YBCO) indicates that sintering kinetics are enhanced at reduced p(O2). The density of specimens sintered at 910-degrees-C increased from 79 to 94% theoretical when p(O2) was decreased from 0.1 to 0.0001 MPa. It is believed that increase in density with decrease in p(O2) is the result of enhanced sintering kinetics, due probably to increased defect concentration, decreased activation energy of the rate-controlling species, and possibly the presence of a small amount of liquid phase. Sintering at 910-degrees-C resulted in a fine-grain microstructure, with an average grain size of almost-equal-to 4-mu-m. Such a microstructure results in reduced microcracking. Consequently, strength as high as 191 MPa is achieved. Reduced microcracking may have important implications for developing microstructures with improved critical current density. RP SINGH, JP (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 17 TC 24 Z9 24 U1 0 U2 2 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 SEP PY 1992 VL 7 IS 9 BP 2324 EP 2332 DI 10.1557/JMR.1992.2324 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500004 ER PT J AU ROUTBORT, JL GORETTA, KC MILLER, DJ KAZELAS, DB CLAUSS, C DOMINGUEZRODRIGUEZ, A AF ROUTBORT, JL GORETTA, KC MILLER, DJ KAZELAS, DB CLAUSS, C DOMINGUEZRODRIGUEZ, A TI COMPRESSIVE CREEP OF DENSE BI2SR1.7CACU2OX SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CA-CU-O; SUPERCONDUCTORS AB Dense polycrystalline Bi2Sr1.7CaCu2Ox (2212) was deformed from 780-835-degrees-C in oxygen partial pressures, P(O2), of 10(3) to 2 X 10(4) Pa. Results could be divided into two stress regimes: one at lower stress in which the steady-state creep rate, epsilon, was proportional to stress, sigma, having an activation energy of 990 +/- 190 kJ/mole and being independent of P(O2), and another at higher stress in which epsilon was proportional to sigma(n), with n almost-equal-to 5-6. Transmission electron microscopy supported the interpretation that in the lower-stress viscous regime, creep was controlled by diffusion, whereas dislocation glide and microcracking were responsible for strain accommodation at higher stresses. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. UNIV SEVILLA,DEPT CONDENSED MATTER PHYS,E-41080 SEVILLE,SPAIN. RP ROUTBORT, JL (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. OI Clauss Klamp, Caroline Maria/0000-0003-4425-4814; Dominguez-Rodriguez, Arturo/0000-0003-1598-5669 NR 19 TC 18 Z9 18 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1992 VL 7 IS 9 BP 2360 EP 2364 DI 10.1557/JMR.1992.2360 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500010 ER PT J AU ONG, TP XIONG, FL CHANG, RPH WHITE, CW AF ONG, TP XIONG, FL CHANG, RPH WHITE, CW TI NUCLEATION AND GROWTH OF DIAMOND ON CARBON-IMPLANTED SINGLE-CRYSTAL COPPER SURFACES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID GRAPHITE FORMATION; DEPOSITION; KINETICS; FILMS; MICROSCOPY; OXIDATION; DISCHARGE; ELECTRON; PLASMA AB The nucleation and growth of diamond crystals on single crystal copper surfaces has been studied. Microwave plasma enhanced chemical vapor deposition (MPECVD) was used for diamond nucleation and growth. Prior to diamond nucleation, the single crystal copper surface is modified by carbon ion implantation at an elevated temperature (approximately 820-degrees-C). This procedure leads to the formation of a graphite film on the copper surface, resulting in an enhancement of diamond crystallite nucleation. A simple lattice model has been constructed to describe the mechanism of diamond nucleation on graphite as [111]diamond parallel to [0001]graphite and [110]diamond parallel to [1120BAR]graphite. This leads to a good understanding of diamond growth on carbon-implanted copper surfaces. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RI Chang, R.P.H/B-7505-2009 NR 36 TC 51 Z9 52 U1 2 U2 8 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 SEP PY 1992 VL 7 IS 9 BP 2429 EP 2439 DI 10.1557/JMR.1992.2429 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500020 ER PT J AU CHANG, HLM YOU, H GAO, Y GUO, J FOSTER, CM CHIARELLO, RP ZHANG, TJ LAM, DJ AF CHANG, HLM YOU, H GAO, Y GUO, J FOSTER, CM CHIARELLO, RP ZHANG, TJ LAM, DJ TI STRUCTURAL-PROPERTIES OF EPITAXIAL TIO2 FILMS GROWN ON SAPPHIRE (11(2)OVER-BAR-0) BY MOCVD SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; THIN-FILMS AB Titanium dioxide thin films were grown on sapphire (1120BAR) substrates in a low-pressure metal-organic chemical vapor deposition system at temperatures ranging from 400 to 800-degrees-C. Raman scattering, x-ray diffraction, transmission electron microscopy, and high resolution electron microscopy techniques were employed to characterize the structural properties of the deposited films. The resultant phases and structures of the deposited films depended on both the growth temperature and the substrate surface properties (surface imperfections, steps, etc.). At the growth temperature of 800-degrees-C, single-crystal rutile films were obtained reproducibly with two possible epitaxial relationships. At lower temperatures (400 to 775-degrees-C), the deposited films can be epitaxial or polycrystalline with highly oriented grains. The similarity between the atomic arrangements of the substrate and the film is discussed in detail to explain the observed epitaxial relationships and abruptness of the interfaces. RP CHANG, HLM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 30 TC 45 Z9 46 U1 3 U2 13 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 SEP PY 1992 VL 7 IS 9 BP 2495 EP 2506 DI 10.1557/JMR.1992.2495 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500028 ER PT J AU HACKLEY, VA ANDERSON, MA SPOONER, S AF HACKLEY, VA ANDERSON, MA SPOONER, S TI A SMALL-ANGLE X-RAY-SCATTERING STUDY OF MICROSTRUCTURE EVOLUTION DURING SINTERING OF SOL-GEL-DERIVED POROUS NANOPHASE TITANIA SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID NEUTRON-SCATTERING; GRAIN-GROWTH; GLASS; COMPACTS; SURFACE; SYSTEMS AB The evolution of microstructure as a function of firing temperature in sol-gel derived porous titania xerogels was investigated by small-angle x-ray scattering (SAXS). SAXS curves for xerogels fired below 550-degrees-C exhibit a well-defined structure peak. This peak indicates the presence of a high degree of order in the electron density correlations associated with the interparticle structure factor. Results from electron microscopy and SAXS give a primary particle mean diameter of 50 angstrom, while scaling analysis of the scattered intensity at large momentum transfer values yields the Porod exponent 4, indicating a sharp transition zone between the solid and void phases. The pore volume fraction of the unfired xerogel is consistent with random close-packing of spheres. The internal surface area decreases almost linearly with increasing firing temperature. Rapid grain growth and pore coarsening begin near 90% of theoretical density, and lead to a breakdown in pore interconnectedness and the development of isolated pores. Observed enhanced sintering properties may be attributed primarily to the large surface-to-mass ratio of the sol-gel particles. The SAXS curves were adequately fit using a bicontinuous phase model developed for late-stage spinodal decomposition structures. Alternatively, the microstructure can be described by a hierarchical close-packing of spheres model. SAXS results are compared with data from gas adsorption and electron microscopy. C1 UNIV WISCONSIN,WATER CHEM PROGRAM,MADISON,WI 53706. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RI Anderson, Marc/I-2437-2015 NR 63 TC 17 Z9 17 U1 1 U2 9 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 SEP PY 1992 VL 7 IS 9 BP 2555 EP 2571 DI 10.1557/JMR.1992.2555 PG 17 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500036 ER PT J AU SPONTAK, RJ BURNS, JL ECHER, CJ AF SPONTAK, RJ BURNS, JL ECHER, CJ TI MORPHOLOGICAL-STUDIES OF NANOCLUSTERS ON GRID-SUPPORTED POLYMER THIN-FILMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID COPPER CLUSTERS; SPECTROSCOPY AB Modification of substrates by controlled deposition of nanometer-size particulates (nanoclusters) is an efficient means of fabricating materials designed for applications in which specific surface interactions play a vital role (e.g., molecular catalysis and microelectronics). We have found that highly dispersed nanoclusters form on thin films of poly(siloxaneimide) (PSI) copolymers supported on copper transmission electron microscopy (TEM) grids when subjected to long anneals at elevated temperatures. In this note, we report on the composition and source of these anomalous nanoclusters, as determined by a variety of electron microscopical techniques. Spectra obtained with parallel electron energy-loss spectroscopy (PEELS) indicate that these particulates, which typically measure 4-18 nm in diameter, are composed of copper with a mean valence of +1. Electron microdiffraction patterns reveal that the nanoclusters are polycrystalline, possessing lattice spacings similar to those Of Cu2O. Mechanistic routes of formation are suggested based on experimental design, and factors influencing formation are also described. C1 PROCTER & GAMBLE CO,MIAMI VALLEY LABS,CINCINNATI,OH 45239. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. NR 26 TC 2 Z9 2 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 SEP PY 1992 VL 7 IS 9 BP 2593 EP 2598 DI 10.1557/JMR.1992.2593 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500040 ER PT J AU BLAU, PJ AF BLAU, PJ TI EFFECTS OF SURFACE PREPARATION ON THE FRICTION AND WEAR BEHAVIOR OF SILICON-NITRIDE SILICON-CARBIDE SLIDING PAIRS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB Silicon carbide and silicon nitride specimens were fabricated to provide three different surface finishes. They were subjected to sphere-on-flat (pin-on-disc) testing in order to determine the interaction of load, velocity, disc surface finish, and material effects on unlubricated friction and wear. Tests were conducted in air using applied loads of 1 and 10 N, velocities of 0.1 and 0.5 ms-1, and surface preparations of 150-grit grinding, 220-grit grinding and fine polishing. The test duration was kept constant at 1000 m of sliding distance for the pin specimen. In half the tests silicon nitride was the pin material and silicon carbide was the disc material. For the other half, the pin and slider materials were reversed. There was a much greater effect of normal force on steady-state friction coefficient than of either surface finish or material pairing. Increasing the sliding velocity raised the friction coefficient for both material pairings and for all surface roughnesses. Higher wear resulted when the velocity increased, but the effect of surface finish on wear ranged from none in some cases to about a factor of 10 in other cases. A trend of increasing run-in period duration with increasing smoothness was observed. The results are interpreted in terms of material properties, the Lim and Ashby model, and the friction force-velocity product. RP BLAU, PJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 11 TC 8 Z9 8 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD SEP 1 PY 1992 VL 27 IS 17 BP 4732 EP 4740 DI 10.1007/BF01166014 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JM312 UT WOS:A1992JM31200028 ER PT J AU KIM, YS YEH, LW AF KIM, YS YEH, LW TI O(2,1)-LIKE LITTLE GROUP FOR SPACELIKE 4-MOMENTA AND LOCALIZED LIGHT WAVES IN CONTINUOUS MEDIA SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID PARTICLES AB While a light wave travels in a nonvacuum medium with speed less than the speed of light in vacuum, its energy-momentum four-vector is spacelike. Thus the little group for this light wave is locally isomorphic to O(2,1). It is shown that the transformation of this little group produces observable effects on the light wave, in contrast to the case of the E(2)-like little group for photons in vacuum. It is also shown that the little group can be defined for a localized light wave consisting of a superposition of waves with different frequencies traveling in the same direction. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP UNIV MARYLAND, DEPT PHYS, COLL PK, MD 20742 USA. NR 14 TC 0 Z9 0 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0022-2488 EI 1089-7658 J9 J MATH PHYS JI J. Math. Phys. PD SEP PY 1992 VL 33 IS 9 BP 3190 EP 3196 DI 10.1063/1.529537 PG 7 WC Physics, Mathematical SC Physics GA JK568 UT WOS:A1992JK56800025 ER PT J AU GOZALO, A DAGLE, GE MONTOYA, E WELLER, RE AF GOZALO, A DAGLE, GE MONTOYA, E WELLER, RE TI SPONTANEOUS CARDIOMYOPATHY RESEMBLING ACUTE RHEUMATIC HEART-DISEASE IN AN OWL MONKEY SO JOURNAL OF MEDICAL PRIMATOLOGY LA English DT Article DE PRIMATE; CEBIDAE; AOTUS-VOCIFERANS; CARDIOMYOPATHY; FIBRINOID NECROSIS AB A wild-caught male Aotus vociferans died spontaneously during quarantine. Histologic examination of the heart showed several small myocardial arteries replaced with fibrinoid necrosis and adjacent inflammation that included lymphocytes and large histiocytic cells. Less often, similar inflammatory foci were observed in the myocardium interstitium. The lesions observed in the heart of the owl monkey resembled Aschoff bodies. C1 PACIFIC NW LAB, RICHLAND, WA USA. UNIV NACL MAYOR SAN MARCOS, INST VET INVEST TROPICALES & ALTURA, IQUITOS, PERU. NR 2 TC 2 Z9 2 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0047-2565 J9 J MED PRIMATOL JI J. Med. Primatol. PD SEP-OCT PY 1992 VL 21 IS 7-8 BP 381 EP 383 PG 3 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA LH165 UT WOS:A1992LH16500010 PM 1307758 ER PT J AU WESTWOOD, AD MICHAEL, JR NOTIS, MR AF WESTWOOD, AD MICHAEL, JR NOTIS, MR TI EXPERIMENTAL-DETERMINATION OF LIGHT-ELEMENT K-FACTORS USING THE EXTRAPOLATION TECHNIQUE - OXYGEN SEGREGATION IN ALUMINUM NITRIDE SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Article DE QUANTITATIVE ANALYTICAL ELECTRON MICROSCOPY; INVERSION DOMAIN BOUNDARIES; ALUMINUM NITRIDE; EXTRAPOLATION TECHNIQUE; LIGHT ELEMENTS; K-FACTORS; MICROANALYSIS ID ANALYTICAL ELECTRON-MICROSCOPE; CERAMIC SUBSTRATE; CROSS-SECTIONS; THICKNESS; MICROANALYSIS; IONIZATION; DETECTORS AB It is shown that quantitative light-element (Z < 10) analysis and k-factor determination of light elements can be routinely conducted, analogous to quantification of elements with Z > 10, using X-ray energy-dispersive spectroscopy. The extrapolation technique was used to determine the k-factors, k(OAl) = 0.88 +/- 0.10 and k(NAl) = 1.61 +/- 0.22 at zero thickness. These values are found to be in good agreement with theoretically calculated k-factors. The limitations and applicability of the extrapolation technique for light-element analyses are discussed. An example of light-element quantification is provided in the analysis of oxygen segregation to inversion domain boundaries in aluminium nitride. C1 SANDIA NATL LABS,DIV ELECTRON OPT,ALBUQUERQUE,NM 87185. RP WESTWOOD, AD (reprint author), LEHIGH UNIV,DEPT MAT SCI & ENGN,BETHLEHEM,PA 18015, USA. NR 38 TC 10 Z9 10 U1 0 U2 1 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 SEP PY 1992 VL 167 BP 287 EP 302 PN 3 PG 16 WC Microscopy SC Microscopy GA JN539 UT WOS:A1992JN53900005 ER PT J AU ROUX, N JOHNSON, C NODA, K AF ROUX, N JOHNSON, C NODA, K TI PROPERTIES AND PERFORMANCE OF TRITIUM BREEDING CERAMICS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID LITHIUM-BASE CERAMICS; COMPREHENSIVE MODEL; RELEASE EXPERIMENTS; IRRADIATION DAMAGE; MATERIALS TTTEX; OXIDE; BEHAVIOR; ALUMINATE; TRANSPORT; BLANKETS AB Lithium-containing ceramics are being strongly considered as tritium breeding materials for fusion reactor blankets owing to their good thermal stability, favorable chemical behavior and tritium breeding potential, and excellent tritium release characteristics. The research effort has focused on four compounds: Li2O, gamma-LiAlO2, Li4SiO4, and Li2ZrO3. The excellent performance shown by these compounds has been confirmed in the selection of lithium-containing ceramics as the first option for the ITER breeder blanket material. Issues identified in blanket design activities are investigated. Current research emphasis is being placed on: (1) exploring solids modification as a means for improving properties and tritium release characteristics, (2) investigating materials behavior under long-term irradiation, (3) developing computer models that describe tritium transport and release, and (4) planning multiple-effects experiments in which ceramic breeder, beryllium neutron multiplier, coolant, and helium purge gas are integrated within one test. Fabrication methodology, properties measurement, interaction between ceramics and other blanket components, irradiation effects, and tritium extraction are reviewed hereafter. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. JAPAN ATOM ENERGY RES INST,DEPT FUELS & MAT RES,TOKAI,IBARAKI 31911,JAPAN. RP ROUX, N (reprint author), CENS,CEA,SERC,DTM,CEREM,DTA,F-91191 GIF SUR YVETTE,FRANCE. NR 88 TC 37 Z9 38 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 15 EP 22 PN A PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700004 ER PT J AU HOLLENBERG, GW WATANABE, H HASTINGS, IJ BERK, SE AF HOLLENBERG, GW WATANABE, H HASTINGS, IJ BERK, SE TI BEATRIX-II - A MULTINATIONAL SOLID BREEDER MATERIALS EXPERIMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID LI2O AB BEATRIX-II is an in situ tritium recovery experiment in the fast flux test facility (FFTF) reactor designed to characterize the feasibility of utilizing solid breeder materials at extended burnups in a fast neutron flux. Although not yet complete, the BEATRIX-II experiments have already substantiated that the solid breeder selected for ITER, Li2O, has good irradiation stability and tritium recovery. Temperature stability, lithium transport, dimensional stability and tritium recovery issues of Li2O UP to 5% Li burnup were addressed in this experiment. Temperature gradients far more severe than in the ITER design, 400 to 1000-degrees-C, were found to be essentially unchanged by burnup and produced no observable instability, either from swelling or lithium vapor transport. Temperature change experiments illustrated that lithium inventories do not appear to increase as a result of irradiation to burnups of 5%. C1 JAPAN ATOM ENERGY RES INST, TOKAI, IBARAKI 31911, JAPAN. ATOM ENERGY CANADA LTD, OTTAWA K1A 0S4, ONTARIO, CANADA. US DOE, WASHINGTON, DC USA. RP HOLLENBERG, GW (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 11 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 23 EP 29 PN A PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700005 ER PT J AU RYBIN, VV SMITH, DL AF RYBIN, VV SMITH, DL TI STRUCTURAL-MATERIALS FOR HIGH-HEAT FLUX APPLICATIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID ION; COPPER AB The structural materials for the ITER (International Thermonuclear Experimental Reactor) divertor must perform reliably under complex and diverse operating requirements. Only a limited number of materials offer a potential for meeting these requirements for the wide temperature range of interest. The candidate materials considered in the ITER design activity include copper, molybdenum, and niobium alloys. Molybdenum alloys being considered include dilute alloys of the TZM type and the Mo-Re system. Niobium alloys under consideration include Nb-V-Zr and Nb-Zr systems. Copper alloys being considered include dispersion strengthened alloys of the Glidcop and MAGT type, alloys of Cu-Mo system and precipitation strengthened bronzes. The projected operating conditions for the ITER divertor and the criteria for evaluating the candidate materials are reviewed. This paper summarizes the data base and presents recent experimental results on these candidate divertor structural alloys. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP RYBIN, VV (reprint author), CRISM PROMETEY,LENINGRAD,USSR. NR 24 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 30 EP 36 PN A PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700006 ER PT J AU KOHYAMA, A GROSSBECK, ML PIATTI, G AF KOHYAMA, A GROSSBECK, ML PIATTI, G TI THE APPLICATION OF AUSTENITIC STAINLESS-STEELS IN ADVANCED FUSION SYSTEMS - CURRENT LIMITATIONS AND FUTURE-PROSPECTS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID PLASMA-FACING COMPONENTS; STRUCTURAL-MATERIALS; TENSILE PROPERTIES; SENSITIZATION; REQUIREMENTS; HELIUM; JAPAN AB During the past decade extensive effort has been devoted to the conceptual designs of large fusion devices. A typical example was seen in the conceptual design activity of ITER, where Type 316 stainless steel was considered the most feasible structural material for the first wall and blanket. There still exist many limitations to application of austenitic stainless steels even in a tokamak of the next generation, and further efforts to overcome those limitations are required. This paper reviews the present understanding of the current limitations of austenitic stainless steels for the application in advanced fusion systems and provides the future prospects of austenitic stainless steels. The major issues to be considered are: (a) the potential for improving performance of austenitic stainless steels, (b) the control of neutron activation, (c) new commercial developments in austenitic alloys which could benefit fusion. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. ISPRA,JRC,INST ADV MAT,I-21020 ISPRA,ITALY. RP KOHYAMA, A (reprint author), UNIV TOKYO,DEPT MAT SCI,BUNKYO KU,TOKYO 113,JAPAN. NR 64 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 37 EP 44 PN A PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700007 ER PT J AU ZINKLE, SJ HODGSON, ER AF ZINKLE, SJ HODGSON, ER TI RADIATION-INDUCED CHANGES IN THE PHYSICAL-PROPERTIES OF CERAMIC MATERIALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID IRRADIATED ALUMINUM NITRIDE; ELECTRICAL-CONDUCTIVITY; THERMAL-CONDUCTIVITY; MECHANICAL-PROPERTIES; DAMAGE; INSULATORS; AL2O3; MGAL2O4; TEMPERATURES; BREAKDOWN AB The results from recent studies on radiation-induced changes in the electrical conductivity, loss tangent, and thermal conductivity of ceramics are reviewed, with particular emphasis on in-situ data obtained during irradiation. The in-situ measurements have found that the physical property degradation during irradiation is generally much more severe than indicated by post-irradiation measurements. In particular, permanent degradation in the electrical resistivity may occur after irradiation to damage levels of < 10(-3) displacements per atom (dpa) for temperatures near 450-degrees-C. This radiation-induced electrical degradation (RIED) is observed only if an electric field is applied during the irradiation. C1 EURATOM, CIEMAT, FUS ASSOC, E-28040 MADRID, SPAIN. RP OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 77 TC 93 Z9 93 U1 3 U2 21 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 58 EP 66 DI 10.1016/0022-3115(92)90731-Y PN A PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700010 ER PT J AU JONES, RH HENAGER, CH HOLLENBERG, GW AF JONES, RH HENAGER, CH HOLLENBERG, GW TI COMPOSITE-MATERIALS FOR FUSION APPLICATIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID SILICON-CARBIDE; CERAMICS AB Ceramic matrix composites, CMCs, are being considered for advanced first wall and blanket structural applications because of their high-temperature properties, low neutron activation, low density and low coefficient of expansion coupled with good thermal conductivity and corrosion behavior. This paper presents a review and analysis of the hermetic, thermal conductivity, corrosion, crack growth and radiation damage properties of CMCs. RP JONES, RH (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. OI Henager, Chuck/0000-0002-8600-6803 NR 19 TC 27 Z9 27 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 75 EP 83 PN A PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700012 ER PT J AU LOOMIS, BA SMITH, DL AF LOOMIS, BA SMITH, DL TI VANADIUM ALLOYS FOR STRUCTURAL APPLICATIONS IN FUSION SYSTEMS - A REVIEW OF VANADIUM ALLOY MECHANICAL AND PHYSICAL-PROPERTIES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID BASE ALLOYS; COMPATIBILITY; ACTIVATION; REACTORS AB Vanadium-base alloys are potential candidates for the structural material in fusion systems. This paper reviews the current knowledge of (a) the effects of neutron irradiation on tensile strength and ductility, ductile-brittle transition temperature, creep, fatigue, and swelling of vanadium-base alloys, (b) the compatibility of vanadium-base alloys with liquid lithium, water, and helium environments, and (c) the effects of hydrogen and helium on the physical and mechanical properties of candidate vanadium-base alloys. We also identify additional physical and mechanical properties issues that require further investigation. C1 ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP LOOMIS, BA (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,9700 S CASS AV,ARGONNE,IL 60439, USA. NR 51 TC 55 Z9 57 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 84 EP 91 PN A PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700013 ER PT J AU HARRIES, DR BUTTERWORTH, GJ HISHINUMA, A WIFFEN, FW AF HARRIES, DR BUTTERWORTH, GJ HISHINUMA, A WIFFEN, FW TI EVALUATION OF REDUCED-ACTIVATION OPTIONS FOR FUSION MATERIALS DEVELOPMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB The European, American and Japanese R&D programmes on the development of low- or reduced-activation materials (LAMs) for fusion were reviewed at an IEA Workshop held at Culham in April 1991 and are surveyed in this paper. The current status and future directions of the work on the establishment of criteria for LAMs in terms of maintenance, safety, recycling and waste disposal and on the assembly of a complete nuclear data base are summarised. Progress in the development of low-activation steels and non-ferrous (vanadium base) alloys is described, their principal advantages and limitations are illustrated and the prospects for further development are outlined. Approaches required to assess the potential of advanced materials, particularly fibre-reinforced ceramic and metal matrix composites, for application as LAMs in fusion reactors are briefly considered. It is concluded that progress in the development of LAMs could be expedited by improved co-ordination and further international collaboration in the respective programmes. C1 AEA FUS,CULHAM LAB,ABINGDON,ENGLAND. JAERI,DEPT FUELS & MAT ENGN,TOKAI,JAPAN. US DOE,WASHINGTON,DC. RP HARRIES, DR (reprint author), CEC,FUS PROGRAMME,BRUSSELS,BELGIUM. NR 16 TC 26 Z9 26 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 92 EP 99 PN A PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700014 ER PT J AU KONDO, T DORAN, DG EHRLICH, K WIFFEN, FW AF KONDO, T DORAN, DG EHRLICH, K WIFFEN, FW TI THE STATUS AND PROSPECTS OF HIGH-ENERGY NEUTRON TEST FACILITIES FOR FUSION MATERIALS DEVELOPMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID IRRADIATION TEST FACILITY; TECHNOLOGY; MIRROR; ESNIT AB The status of progress in the development of facility concepts and the relevant technology is summarized, referring to the recent outcomes from the international collaborative activities on reviewing the technical feasibility and the suitability of candidate facilities for testing fusion reactor materials. The discussion is focussed on the way to reach the goal of an international fusion materials irradiation facility (IFMIF), which is capable of testing materials for DEMO reactors and beyond. Based on the state of knowledge reviewed, a staged approach is suggested in phase with the current world strategy for fusion power development. C1 WASHINGTON STATE UNIV,RICHLAND,WA 99352. KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. US DOE,WASHINGTON,DC 20585. RP KONDO, T (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 31 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 100 EP 107 PN A PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700015 ER PT J AU DELARUBIA, TD PHYTHIAN, WJ AF DELARUBIA, TD PHYTHIAN, WJ TI MOLECULAR-DYNAMICS STUDIES OF DEFECT PRODUCTION AND CLUSTERING IN ENERGETIC DISPLACEMENT CASCADES IN COPPER SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID EMBEDDED-ATOM-METHOD; DEPLETED ZONES; METALS; CU; NI; TUNGSTEN; DAMAGE; NICKEL; ALLOYS AB We review recent molecular dynamics studies of displacement cascades in copper at energies from near threshold to 25 keV where nascent subcascades develop. We discuss the structure of the cascade region and present results on the dynamical evolution and lifetime of the cascades. We show that the defect production efficiency in cascades follows a downward trend with energy, in good quantitative agreement with experiments. The cluster size distributions from the simulations show a strong recoil energy dependence. At low energy, loosely correlated vacancy distributions are generally observed. However, as the energy and hence the lifetime of the cascade increase, large vacancy clusters appear. Evidence is presented for the athermal collapse of a 25 keV cascade to a vacancy dislocation loop. Interstitial production mechanisms are identified. At all energies studied replacement collision sequences are observed. Moreover, vacancy-interstitial separation mechanisms based on ballistic clustering and dislocation loop punching from cascades are presented. RP DELARUBIA, TD (reprint author), LAWRENCE LIVERMORE NATL LAB,L-644,LIVERMORE,CA 94550, USA. NR 39 TC 58 Z9 58 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 108 EP 115 PN A PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700016 ER PT J AU KLUEH, RL EHRLICH, K ABE, F AF KLUEH, RL EHRLICH, K ABE, F TI FERRITIC MARTENSITIC STEELS - PROMISES AND PROBLEMS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID TENSILE PROPERTIES; IRRADIATION; HELIUM; 9CR-1MOVNB; BEHAVIOR AB Ferritic/martensitic steels are candidate structural materials for fusion reactors because of their higher swelling resistance, higher thermal conductivity, lower thermal expansion, and better liquid-metal compatibility than austenitic steels. Irradiation effects will ultimately determine the applicability of these steels, and the effects of irradiation on microstructure and swelling, and on the tensile, fatigue, and impact properties of the ferritic/martensitic steels are discussed. Most irradiation studies have been carried out in fast reactors, where little transmutation helium forms. Helium has been shown to enhance swelling and affect tensile and fracture behavior, making helium a critical issue, since high helium concentrations will be generated in conjunction with displacement damage in a fusion reactor. These issues are reviewed to evaluate the status of ferritic/martensitic steels and to assess the research required to insure that such steels are viable candidates for fusion applications. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. NATL RES INST MET,TSUKUBA LABS,TSUKUBA 305,JAPAN. RP KLUEH, RL (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 59 TC 73 Z9 74 U1 2 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 116 EP 124 PN A PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700017 ER PT J AU FLAMENT, T TORTORELLI, P COEN, V BORGSTEDT, HU AF FLAMENT, T TORTORELLI, P COEN, V BORGSTEDT, HU TI COMPATIBILITY OF MATERIALS IN FUSION 1ST WALL AND BLANKET STRUCTURES COOLED BY LIQUID-METALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID CORROSION BEHAVIOR; STAINLESS-STEELS; FLOWING PB-17LI; LITHIUM AB Compatibility studies of lithium and lead-lithium have been conducted over approximately the past ten years in support of fusion reactor applications. At the present time, there exists a fairly good understanding of the overall corrosion mechanisms in both liquid metals and of differences in corrosion behavior between the two environments. Pb17Li is more aggressive toward steels due to the higher solubilities of iron, nickel and chromium in this liquid metal. While nitrogen and carbon can have significant effects on corrosion of steels by lithium, particularly at 400-500-degrees-C, these elements have little influence in Pb17Li. The effects of these liquid metal environments on the mechanical properties of steels have been characterized and only minor problems are anticipated. The state of knowledge regarding the dependence of the corrosion rate of steels exposed to Pb17Li on blanket operating parameters is much more advanced than that for lithium. For both liquid metals, more in-depth studies of deposition and magnetic field effects are needed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. JOINT RES CTR,ISPRA,ITALY. KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. RP FLAMENT, T (reprint author), CEA,DTA,CEREM,DTM,SCECF,BP6,F-92265 FONTENAY ROSES,FRANCE. RI Tortorelli, Peter/E-2433-2011 NR 55 TC 22 Z9 22 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 132 EP 138 PN A PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700019 ER PT J AU MATTAS, RF SMITH, DL WU, CH KURODA, T SHATALOV, G AF MATTAS, RF SMITH, DL WU, CH KURODA, T SHATALOV, G TI MATERIALS ISSUES IN THE DESIGN OF THE ITER 1ST WALL, BLANKET, AND DIVERTOR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID EROSION AB During the ITER conceptual design study, a property data base was assembled, the key issues were identified, and a comprehensive R&D plan was formulated to resolve these issues. The desired properties of candidate ITER divertor, first wall, and blanket materials are briefly reviewed, and the major materials issues are presented. Estimates of the influence of materials properties on the performance limits of the first wall, blanket, and divertor are presented. C1 MAX PLANCK INST PLASMA PHYS,NET TEAM,W-8046 GARCHING,GERMANY. JAPAN ATOM ENERGY RES INST,NAKA,IBARAKI 31102,JAPAN. KURCHATOV ATOM ENERGY INST,MOSCOW 123182,USSR. RP MATTAS, RF (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 8 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 139 EP 145 PN A PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700020 ER PT J AU SMOLIK, GR MERRILL, BJ WALLACE, RS AF SMOLIK, GR MERRILL, BJ WALLACE, RS TI IMPLICATIONS OF BERYLLIUM - STEAM INTERACTIONS IN FUSION-REACTORS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Reaction rates were determined for fully dense and porous 88% dense beryllium in steam between 600 and 1230-degrees-C. These materials could represent high or low quality plasma-sprayed beryllium on plasma-facing components (PFCs) in a fusion reactor. Reaction rates for the porous material were 200 times higher than those for solid material at comparable temperatures. The porous material also developed self-sustaining reactions at temperatures as low as 600-degrees-C. First wall temperatures calculated for the international thermonuclear experimental reactor (ITER) during a worst-case loss of coolant accident (LOCA) indicate that 2 mm thick layers of either dense or porous beryllium would completely react. The generation of over 640 kg of hydrogen and aerosols containing 68 kg of beryllium presents serious safety concerns. The poor thermal stability of porous beryllium, which could also represent blanket material, suggests that a more stable form or compound of beryllium should be used for these applications. RP SMOLIK, GR (reprint author), EG&G IDAHO INC, IDAHO NATL ENGN LAB, POB 1625, IDAHO FALLS, ID 83415 USA. NR 8 TC 23 Z9 23 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 153 EP 157 DI 10.1016/0022-3115(92)90743-5 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700022 ER PT J AU GELLES, DS HEINISCH, HL AF GELLES, DS HEINISCH, HL TI NEUTRON DAMAGE IN BERYLLIUM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID TEMPERATURES AB The effects of neutron irradiation on the mechanical properties and helium retention of beryllium are being studied using postirradiation tensile testing, fractography, and microstructural examinations on arc cast beryllium that was irradiated in the FFTF/MOTA to support the International Thermonuclear Experimental Reactor (ITER) design effort. Miniature sheet tensile specimens were embrittled by irradiation at 400-degrees-C to 8 displacements per atom (dpa). Failure with zero ductility occurs with both transgranular brittle cleavage and grain boundary embrittlement. Based on microstructural examination, embrittlement is ascribed both to helium bubble formation at grain boundaries and to c-type loop formation. Loop formation of this type has rarely been reported in the literature. Companion microstructural examination specimens of identical material were irradiated at 500-degrees-C to 1 dpa. The major effect of irradiation at 500-degrees-C is the development of helium bubbles on matrix and grain boundary dislocations, but evidence of the onset of void swelling was also found. RP GELLES, DS (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 15 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 194 EP 198 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700031 ER PT J AU SLAGLE, OD KURASAWA, T VERRALL, RA HOLLENBERG, GW AF SLAGLE, OD KURASAWA, T VERRALL, RA HOLLENBERG, GW TI INSITU TRITIUM RECOVERY FROM LI2O IRRADIATED IN FAST-NEUTRON FLUX - BEATRIX-II TEMPERATURE-CHANGE SPECIMEN SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB The BEATRIX-11 irradiation experiment is an in situ tritium release experiment to evaluate the stability and tritium release characteristics of Li2O under fast neutron irradiation to extended burnups. A thin annular ring specimen capable of temperature changes was irradiated in phase I of the experiment to a lithium burnup of 5%. The primary emphasis of the test plan was to determine the effect and interrelationship of gas composition and temperature on the tritium recovery from Li2O. Temperature changes in the range from 500 to 650-degrees-C resulted in a decreasing tritium inventory with increasing temperature and a series of specific temperature changes were carried out at intervals throughout the experiment to characterize the effect of burnup. Decreasing the amount of hydrogen in the sweep gas resulted in an increase in the tritium inventory in the Li2O specimen. The tritium recovery during startup and shutdown was observed to be strongly influenced by the composition of the sweep gas. C1 JAPAN ATOM ENERGY RES INST, TOKAI, IBARAKI 31911, JAPAN. AECL RES, CHALK RIVER, ONTARIO, CANADA. RP SLAGLE, OD (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 8 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 214 EP 218 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700035 ER PT J AU KOPASZ, JP SEILS, CA JOHNSON, CE AF KOPASZ, JP SEILS, CA JOHNSON, CE TI TRITIUM RELEASE FROM LITHIUM ALUMINATE - CAN IT BE IMPROVED SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID ADSORPTION AB Lithium aluminate is an attractive material (in terms of its chemical, mechanical and irradiation properties) for breeding tritium in fusion reactors; however, its tritium release characteristics are not as good as those of other candidate materials. To investigate whether tritium release from lithium aluminate can be improved, we have studied the tritium release from irradiated samples of pure lithium aluminate, lithium aluminate doped with Mg, and lithium aluminate with a surface deposit of platinum. The release was studied by the temperature programmed desorption (TPD) method. Both the platinum coating and magnesium doping were found to improve the tritium release characteristics, as determined by TPD. Tritium release shifted to states with lower activation energies for the altered materials. RP KOPASZ, JP (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 11 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 231 EP 235 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700039 ER PT J AU FISCHER, AK AF FISCHER, AK TI TEMPERATURE PROGRAMMED DESORPTION FROM LIALO2 TREATED WITH H2 SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB Temperature programmed desorption (TPD) measurements have been made of H2O and H-2 desorption from LiAlO2 treated at 923 K with He-H-2 mixtures containing 990, 495, and 247 vppm H-2. Desorptions were into sweep gases of pure He and into He-H-2 Mixtures. The H2O and H-2 desorption peaks were shown to be the sums of first order subpeaks which had reproducible desorption activation energy and pre-exponential terms. For H2O desorption, the activation energies were 96, 117, and 134 kJ/mol (23, 28, and 32 kcal/mol). (Earlier work had identified an additional peak with an activation energy of 75 kJ/mol (18 kcal/mol.) Enhancement of desorption of H2O by H-2 in the sweep gas was confirmed. The enhancement results not from modifying the activation energies and pre-exponential terms for the various sites but from changes in the populations of sites participating in the desorption process so that sites with lower activation energies are increasingly involved. For those runs with He as the sweep gas, desorption of H-2 could be observed. The subpeaks involved had activation energies within approximately 4 kJ/mol (1 kcal/mol) higher than the analogous peaks for H2O desorption. RP FISCHER, AK (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 236 EP 239 PN A PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700040 ER PT J AU TAM, SW AMBROSE, V AF TAM, SW AMBROSE, V TI TRITIUM TRANSPORT IN LITHIUM CERAMICS POROUS-MEDIA SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID COMPREHENSIVE MODEL; BASE CERAMICS; BEHAVIOR AB A random network model has been utilized to analyze the problem of tritium percolation through porous Li ceramic breeders. Local transport in each pore channel is described by a set of convection diffusion reaction equations. Long range transport is described by a matrix technique. The heterogeneous structure of the porous medium is accounted for via Monte Carlo methods. The model was then applied to an analysis of the approach to steady state tritium release from solid breeders. Diffusion was found to be the dominant transport process. The time constant for the approach to steady state was found to obey a scaling law with respect to the size L of the network. This scaling law was found to closely approximate the scaling law obeyed by conventional diffusion process in a completely homogeneous medium. C1 TEXAS CHRISTIAN UNIV,DEPT PHYS,FT WORTH,TX 76129. RP TAM, SW (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 253 EP 257 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700044 ER PT J AU BURCHELL, TD EATHERLY, WP ROBBINS, JM STRIZAK, JP AF BURCHELL, TD EATHERLY, WP ROBBINS, JM STRIZAK, JP TI THE EFFECT OF NEUTRON-IRRADIATION ON THE STRUCTURE AND PROPERTIES OF CARBON CARBON COMPOSITE-MATERIALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB Carbon-based materials are an attractive choice for fusion reactor plasma facing components (PFCs) because of their low atomic number, superior thermal shock resistance. and low neutron activation. Next generation plasma fusion reactors, such as the international thermonuclear experimental reactor (ITER), will require advanced carbon-carbon composite materials possessing extremely high thermal conductivity to manage the anticipated severe heat loads. Moreover, ignition machines such as ITER will produce high neutron fluxes. Consequently, the influence of neutron damage on the structure and properties of carbon-carbon composite materials must be evaluated. Data from an irradiation experiment are reported and discussed here. Fusion relevant graphite and carbon-carbon composites were irradiated in a target capsule in the high flux isotope reactor (HFIR) at Oak Ridge National Laboratory (ORNL). A peak damage dose of 1.58 dpa (displacements per atom) at 600-degrees-C was attained. The carbon materials irradiated included nuclear graphite grade H-451 and one-, two-, and three-directional carbon-carbon composite materials. Dimensional changes and strength are reported for the materials examined. The influence of fiber type, architecture, and heat treatment temperature on properties and irradiation behavior are reported. Carbon-carbon composite dimensional changes are interpreted in terms of simple microstructural models. RP BURCHELL, TD (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Burchell, Tim/E-6566-2017 OI Burchell, Tim/0000-0003-1436-1192 NR 6 TC 15 Z9 15 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 295 EP 299 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700052 ER PT J AU GARNER, FA HAMILTON, ML SHIKAMA, T EDWARDS, DJ NEWKIRK, JW AF GARNER, FA HAMILTON, ML SHIKAMA, T EDWARDS, DJ NEWKIRK, JW TI RESPONSE OF SOLUTE AND PRECIPITATION STRENGTHENED COPPER-ALLOYS AT HIGH NEUTRON EXPOSURE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID DPA AB A variety of solute and precipitation strengthened copper based alloys were irradiated to displacement levels of 34 dpa at 411-degrees-C, and 50, 100 and 150 dpa at 414-degrees-C in the Fast Flux Test Facility to assess their potential for high heat flux applications in fusion reactors. Several MZC-type alloys appear to offer the most promise for further study. For low fluence applications CuBeNi and spinodally strengthened CuNiTi alloys may also be suitable. Although Cu-2Be resists swelling, it is not recommended for fusion reactor applications because of its low conductivity. C1 TOHOKU UNIV, OARAI, JAPAN. UNIV MISSOURI, ROLLA, MO 65401 USA. RP GARNER, FA (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Shikama, Tatsuo/C-3042-2011 NR 23 TC 26 Z9 26 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 386 EP 390 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700071 ER PT J AU EDWARDS, DJ ANDERSON, KR GARNER, FA HAMILTON, ML STUBBINS, JF KUMAR, AS AF EDWARDS, DJ ANDERSON, KR GARNER, FA HAMILTON, ML STUBBINS, JF KUMAR, AS TI IRRADIATION PERFORMANCE OF OXIDE DISPERSION STRENGTHENED COPPER-ALLOYS TO 150 DPA AT 415-DEGREES-C SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID STRUCTURAL-MATERIALS; 1ST WALL; CONDUCTIVITY; FLUX AB Results have been obtained on the post-irradiation properties of various oxide dispersion strengthened copper alloys irradiated from 34 to 150 dpa at 415-degrees-C in the Fast Flux Test Facility. The GlidCop(TM) alloys strengthened by Al2O3 continue to outperform other alloys with respect to swelling resistance and retention of both electrical conductivity and yield strength. Several castable ODS alloys and a Cr2O3-strengthened alloy show increasingly poor resistance to radiation, especially in their swelling behavior. A HfO2-strengthened alloy retains most of its strength and its electrical conductivity reaches a constant level after 50 dpa, but it exhibits a higher residual radioactivity. C1 UNIV ILLINOIS, URBANA, IL 61801 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP EDWARDS, DJ (reprint author), UNIV MISSOURI, ROLLA, MO 65401 USA. NR 20 TC 13 Z9 13 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 416 EP 420 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700077 ER PT J AU PETERSON, DT HULL, AB LOOMIS, BA AF PETERSON, DT HULL, AB LOOMIS, BA TI HYDROGEN EMBRITTLEMENT CONSIDERATIONS IN NIOBIUM-BASE ALLOYS FOR APPLICATION IN THE ITER DIVERTOR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID VANADIUM-NIOBIUM; DEUTERIUM; NB AB The ITER divertor will be subjected to hydrogen from aqueous corrosion by the coolant and by transfer from the plasma. Global hydrogen concentrations are one factor in assessing hydrogen embrittlement but local concentrations affected by source fluxes and thermotransport in thermal gradients are more important considerations. Global hydrogen concentrations in some corrosion-tested alloys will be presented and interpreted. The degradation of mechanical properties of Nb-base alloys due to hydrogen is a complex function of temperature, hydrogen concentration, stresses and alloy composition. The known tendencies for embrittlement and hydride formation in Nb alloys are reviewed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP PETERSON, DT (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 11 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 430 EP 432 PN A PG 3 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700080 ER PT J AU GAHL, JM MCDONALD, JM ZAKHAROV, A TSEREVITINOV, S BARABASH, V GUSEVA, M AF GAHL, JM MCDONALD, JM ZAKHAROV, A TSEREVITINOV, S BARABASH, V GUSEVA, M TI HEAT LOAD MATERIAL STUDIES - SIMULATED TOKAMAK DISRUPTIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB It is clear that an improved understanding of the effects of tokamak disruptions on plasma facing component materials is needed for the ITER program. Very large energy fluxes are predicted to be deposited in ITER and could be very damaging to the machine. During 1991, Sandia National Laboratories and the University of New Mexico conducted cooperative tokamak disruption simulation experiments at several Soviet facilities. These facilities were located at the Efremov Institute in Leningrad, the Kurchatov Atomic Energy Institute (Troisk and Moscow) and the Institute for Physicial Chemistry of the Soviet Academy of Sciences in Moscow. Erosion of graphite from plasma stream impact is seen to be much less than that observed with laser or electron beams with similar energy fluxes. This, along with other data obtained, seem to suggest that the "vapor shielding" effect is a very important phenomenon in the study of graphite erosion during tokamak disruption. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. USSR ACAD SCI,INST PHYS CHEM,MOSCOW,USSR. KURCHATOV ATOM ENERGY INST,TROISK,USSR. EFREMOV INST LENINGRAD,LENINGRAD,USSR. RP GAHL, JM (reprint author), UNIV NEW MEXICO,ALBUQUERQUE,NM 87131, USA. NR 9 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 454 EP 459 PN A PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700085 ER PT J AU LEE, CK CHIN, BA ZINKLE, S WILCOX, RC AF LEE, CK CHIN, BA ZINKLE, S WILCOX, RC TI BRAZING OF COPPER ALUMINA ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB The successful use of GlidCop Al-15 in tokamak fusion reactors depends on the ability to join the alloy during fabrication without destroying its properties. An induction brazing process using a 50 kW induction furnace with an oval shaped helical coil and the silver-base brazing alloy, BAg-5, has been developed. This process minimizes the time required at elevated temperatures during the brazing process in order to eliminate excessive oxidation associated with furnace brazing. Induction brazing severely restricts the time for silver ingression along the grain boundaries. Examination of the microstructure of induction brazed joints indicated that the brazing procedure produced virtually no diffusion zone at the copper-silver interface. Microhardness measurements indicated little or no difference along the length of the alloy after brazing. Tensile tests of induction brazed lap joints have indicated good braze properties. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP LEE, CK (reprint author), AUBURN UNIV,DEPT MECH ENGN,AUBURN,AL 36849, USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 10 TC 7 Z9 7 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 488 EP 492 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700092 ER PT J AU HASSANEIN, A AF HASSANEIN, A TI ANALYSIS OF SWEEPING HEAT LOADS ON DIVERTOR PLATE MATERIALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB The heat flux on the divertor plate of a fusion reactor is probably one of the most limiting constraints on its lifetime. The current heat flux profile on the outer divertor plate of a device like the International Thermonuclear Experimental Reactor (ITER) is highly peaked with narrow profile. The peak heat flux can be as high as 30-40 MW/m2 with full width at half maximum (FWHM) of the order of a few centimeters. Sweeping the separatrix along the divertor plate is one of the options proposed to reduce the thermomechanical effects of this highly peaked narrow profile. The effectiveness of the sweeping process is investigated parametrically for various design values. The optimum sweeping parameters of a particular heat load will depend on the design of the divertor plate as well as on the profile of such a heat load. In general, moving a highly peaked heat load results in substantial reduction of the thermomechanical effects on the divertor plate. RP HASSANEIN, A (reprint author), ARGONNE NATL LAB,FUS POWER PROGRAM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 499 EP 502 PN A PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700094 ER PT J AU HASSANEIN, A SMITH, DL AF HASSANEIN, A SMITH, DL TI THERMAL RESPONSE OF SUBSTRATE STRUCTURAL-MATERIALS DURING A PLASMA DISRUPTION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID STABILITY AB Intense energy fluxes to in-vessel components like the first wall and the divertor plate of a fusion reactor are expected during plasma disruptions. This high energy deposition in short times may cause severe surface erosion of these components resulting from melting and vaporization. Coatings and tile materials are proposed to protect and maintain the integrity of the underneath structural materials from both erosion losses as well as from high thermal stresses encountered during a disruption. The coating thickness should be large enough to withstand both erosion losses and to reduce the temperature rise in the substrate structural material. Yet the coating thickness should be minimized to reduce potential problems from radioactivity, toxicity, and plasma contamination. Tile materials such as graphite and coating materials such as tungsten and beryllium on structural materials like copper and steel are analyzed as potential divertor and first wall design options. The minimum coating thickness required to protect the structural material is discussed for a range of disruption parameters. RP HASSANEIN, A (reprint author), ARGONNE NATL LAB,FUS POWER PROGRAM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 503 EP 507 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700095 ER PT J AU HULL, JR AF HULL, JR TI POTENTIAL FOR USE OF HIGH-TEMPERATURE SUPERCONDUCTORS IN FUSION-REACTORS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID DENSITY; MAGNETS; SYSTEM; DESIGN; FILMS; ITER AB The present rate of development of high-temperature superconductors (HTSs) is sufficiently rapid that there may be opportunities for their use in contemporary fusion devices such as the International Thermonuclear Experimental Reactor (ITER). The most likely application is for delivering power to the superconducting magnets, especially in substituting for the current leads between the temperatures of 4 and 77 K. A second possible application of HTSs is in a liquid-nitrogen-cooled power bus connecting the power supplies to the magnets, thus reducing ohmic heating losses in these relatively long cables. A third potential application of HTSs is in inner high-field windings of the toroidal field coils that would operate at approximately 20 K. While the use of higher temperature magnets offers significant advantages to the reactor system, it is unlikely that tested HTSs for this application will be available within the ITER time frame. RP HULL, JR (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 23 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 520 EP 524 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700098 ER PT J AU PELLS, GP HEIDINGER, R IBARRASANCHEZ, A OHNO, H GOULDING, RH AF PELLS, GP HEIDINGER, R IBARRASANCHEZ, A OHNO, H GOULDING, RH TI AN INTERCOMPARISON OF TECHNIQUES FOR MEASURING DIELECTRIC PERMITTIVITY AND LOSS OVER A WIDE FREQUENCY-RANGE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB It is acknowledged that measurements of dielectric constants in low loss materials are difficult in absolute terms and it is a common experience that measurements on the same material using different techniques may give different results. An intercomparison has been made, under the auspices of the IEA, between the measuring facilities of the various laboratories working on dielectrics for fusion reactors. MACOR was chosen as the test material having a moderate loss and being available in sufficient quantity at reasonable cost. A single block was purchased through the EEC, cut up and distributed to the laboratories at Harwell, KfK Karlsruhe, CIEMAT, JAERI and LANL/ORNL. Measurements of permittivity and loss tangent have been made over a frequency range of 1 kHz to 35 GHz and the results show an encouraging agreement between the various laboratories. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. CIEMAT,MADRID,SPAIN. JAPAN ATOM ENERGY RES INST,IBARAKI,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN. RP PELLS, GP (reprint author), AEA REACTOR SERV,HARWELL,ENGLAND. NR 5 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 535 EP 538 PN A PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700101 ER PT J AU FARNUM, EH KENNEDY, JC CLINARD, FW FROST, HM AF FARNUM, EH KENNEDY, JC CLINARD, FW FROST, HM TI RADIATION-INDUCED CONDUCTIVITY IN ALUMINA FROM 100-HZ TO 10-MHZ DURING PROTON IRRADIATION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN AB Changes in the dielectric constant and loss tangent of alumina have been measured in situ during proton irradiation. In these experiments, single crystal sapphire specimens were irradiated with 3 MeV protons which passed through the sample and were stopped in a copper-block heat sink. Dielectric properties were measured between 100 Hz and 10 MHz using a guard-ring capacitor configuration. The proton irradiation caused an immediate increase in loss tangent from about 10(-4) to more than 1.0. We have evaluated these changes at 300 and 373 K, vs irradiation time, flux and frequency. While the in situ radiation-induced conductivity (RIC) depends on these variables as well as on the history of previous irradiation, we believe that it is caused by a balance between the generation rate of electrons and holes, and their trapping and annihilation at displacement-type defects. RP FARNUM, EH (reprint author), LOS ALAMOS NATL LAB,CERAM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545, USA. NR 9 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 548 EP 551 PN A PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700104 ER PT J AU SNEAD, LL ZINKLE, SJ STEINER, D AF SNEAD, LL ZINKLE, SJ STEINER, D TI RADIATION-INDUCED MICROSTRUCTURE AND MECHANICAL PROPERTY EVOLUTION OF SIC/C/SIC COMPOSITE-MATERIALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Chemically vapor deposited (CVD) SiC/C/Nicalon composites have been neutron irradiated in both HFIR and FFTF from 1 to 15 dpa and have been ion beam damaged with 3 MeV carbon ions to 30 dpa in a temperature range from room temperature to 900-degrees-C. Following room temperature carbon irradiation amorphization occurred in both the CVD SiC and Nicalon fiber with measured amorphization thresholds of 15 and 1 dpa, respectively. Elastic modulus and hardness have been measured for both the ion beam and neutron irradiated materials. The CVD SiC showed a significant decrease in modulus and hardness following irradiation while the Nicalon fibers modulus and hardness increased. C1 RENSSELAER POLYTECH INST, TROY, NY 12180 USA. RP SNEAD, LL (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37931 USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 6 TC 34 Z9 34 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 560 EP 565 DI 10.1016/0022-3115(92)90828-9 PN A PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700107 ER PT J AU SNEAD, LL STEINER, D ZINKLE, SJ AF SNEAD, LL STEINER, D ZINKLE, SJ TI MEASUREMENT OF THE EFFECT OF RADIATION-DAMAGE TO CERAMIC COMPOSITE INTERFACIAL STRENGTH SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID MATRIX COMPOSITES AB A technique has been developed by which the bond strength and interfacial friction can be directly measured in ceramic composites. Sections of SiC/C/Nicalon composite are thinned to as low as 35 mum and individual fibers are pushed out of the composite while accurate load displacement data is taken. Such a technique has been applied to composite sections irradiated to 1 dpa at 300-degrees-C in HFIR. The interfacial properties were found to be directly related to the composite strength and type of composite failure. C1 RENSSELAER POLYTECH INST, TROY, NY 12181 USA. RP SNEAD, LL (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 9 TC 44 Z9 44 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 566 EP 570 DI 10.1016/0022-3115(92)90829-A PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700108 ER PT J AU STOLLER, RE GOULDING, RH ZINKLE, SJ AF STOLLER, RE GOULDING, RH ZINKLE, SJ TI MEASUREMENT OF DIELECTRIC-PROPERTIES IN CERAMICS UNDER IONIZING AND DISPLACIVE IRRADIATION CONDITIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID CONDUCTIVITY; AL2O3 AB Several experiments have been completed in which the dielectric properties of ceramic materials were measured during ionizing and displacive irradiation. The experimental matrix included single crystal sapphire, commercial-grade polycrystalline alumina, magnesium aluminate spinel, silicon nitride, and aluminum nitride. These materials are candidates for use in a number of fusion reactor components. The measurements were made at 100 MHz using a capacitively loaded resonant cavity. Essentially no affect of ionizing radiation alone was observed for damage rates up to about 5 x 10(5) Gy/h. However, pulsed fission reactor irradiation led to dramatic increases in the loss tangent. The fractional contributions of the ionizing and displacive fields to the total change observed during the neutron irradiations could not be unambiguously determined. The results of these experiments indicate that the use of postirradiation measurements leads to an underestimate of the radiation-induced dielectric degradation that occurs in the radiation field. C1 OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831. RP STOLLER, RE (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Stoller, Roger/H-4454-2011; Goulding, Richard/C-5982-2016; OI Goulding, Richard/0000-0002-1776-7983; Zinkle, Steven/0000-0003-2890-6915 NR 16 TC 15 Z9 15 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 602 EP 606 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700116 ER PT J AU ALLEN, WR ZINKLE, SJ AF ALLEN, WR ZINKLE, SJ TI LATTICE LOCATION AND CLUSTERING OF HELIUM IN CERAMIC OXIDES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB The lattice location and clustering of He-3, implanted al 200 keV, in sapphire and magnesia have been investigated with ion channeling, nuclear reaction analysis and transmission electron microscopy. A typical helium atom implanted in sapphire at 300 K prefers to locate near an octahedral interstice that was intrinsically unfilled by a cation, known as a constitutional vacancy. The occupation of this lattice site dominates over either substitutional placement in irradiation-produced vacancies or aggregation in bubbles. The fraction of implanted helium occupying a unique lattice site decreases for irradiation temperatures greater than about 800 K and becomes negligible above 1073 K. In sapphire, cavities decorating dislocation loops were observed to form for implantation at 1073 K. The inability to assign a definite lattice site for helium in magnesia can be attributed the absence of constitutional vacancies within the crystal structure. RP ALLEN, WR (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 23 TC 14 Z9 14 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 625 EP 629 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700121 ER PT J AU YAMADA, R ZINKLE, SJ PELLS, GP AF YAMADA, R ZINKLE, SJ PELLS, GP TI DEFECT FORMATION IN ION-IRRADIATED AL2O3 AND MGAL2O4 - EFFECTS OF GRAIN-BOUNDARIES AND FUSION TRANSMUTATION PRODUCTS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID MICROSTRUCTURE; CERAMICS; BOMBARDMENT; DAMAGE AB Polycrystalline alumina (Al2O3) and spinel (MgAl2O4) were preimplanted with H, He and C, and irradiated with Ar+ ions at temperatures of 260 to 810-degrees-C in order to examine the effects of displacement damage and transmutation products on cavity and dislocation loop formation. In alumina, cavities were formed in all the Ar+ irradiated specimens for both the unimplanted and preimplanted H, He and C cases. Larger cavities occur preferentially near grain boundaries after high dose irradiation at elevated temperatures. This preference depends on grain orientation, and appears to be related to the anisotropy of the hexagonal crystal structure. In contrast, cavity formation in spinel was only observed in preimplanted specimens irradiated with Ar+ ions at relatively high temperatures or high doses. Wide defect-free regions adjacent to grain boundaries were observed in spinel for certain irradiation conditions. C1 HARWELL LAB,DIDCOT OX11 0RA,OXON,ENGLAND. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP YAMADA, R (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. OI Zinkle, Steven/0000-0003-2890-6915 NR 12 TC 17 Z9 17 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 640 EP 644 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700124 ER PT J AU ZINKLE, SJ AF ZINKLE, SJ TI ANISOTROPIC DISLOCATION LOOP NUCLEATION IN ION-IRRADIATED MGAL2O4 SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL SP MINERALS MET & MAT SOC, AMER SOC MET INT, ATOM ENERGY SOC JAPAN ID CERAMICS; DAMAGE AB Polycrystalline disks of stoichiometric magnesium aluminate spinel (MgAlO4) were irradiated with 2 MeV Al+ ions at 650-degrees-C and subsequently analyzed in cross section using transmission electron microscopy (TEM). Interstitial dislocation loops were observed on {110} and {111} habit planes. The population of loops on both sets of habit planes was strongly dependent on their orientation with respect to the ion beam direction. The density of loops with habit plane normals nearly perpendicular to the ion beam direction was much higher than loops with habit plane normals nearly parallel to the ion beam direction. On the other hand, the loop size was nearly independent of habit plane orientation. This anisotropic loop nucleation does not occur in ion-irradiated metals such as copper and may be associated with the structure of displacement cascades in ceramics. RP ZINKLE, SJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 13 TC 9 Z9 9 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 645 EP 649 PN A PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY417 UT WOS:A1992JY41700125 ER PT J AU COLE, JI GELLES, DS HOYT, JJ AF COLE, JI GELLES, DS HOYT, JJ TI PHASE-STABILITY OF REDUCED-ACTIVATION MN-STABILIZED AUSTENITIC STEELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID FE-CR-MN; NEUTRON-IRRADIATION; ALLOYS AB The thermal aging response of three Mn-stabilized austenitic alloys: Fe-15Cr-15Mn, Fe-10Cr-30Mn and Fe-30Mn, is characterized as a function of aging time and temperature using optical metallography, analytical electron microscopy, microhardness, and magnetic susceptibility measurements. The alloys were aged in the 20% cold-worked state from 1000 to 30000 h between 300 and 700-degrees-C. Isothermal sections at 300, 500 and 600-degrees-C are constructed for the Fe-Cr-Mn system from the experimental data. Results indicate that Mn-stabilized austenitics are significantly more prone to form secondary phases during thermal aging than their Ni-stabilized counterparts. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP COLE, JI (reprint author), WASHINGTON STATE UNIV, DEPT MECH & MAT ENGN, PULLMAN, WA 99164 USA. OI Cole, James/0000-0003-1178-5846 NR 11 TC 7 Z9 8 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 657 EP 661 DI 10.1016/0022-3115(92)90554-X PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700002 ER PT J AU ALEXANDER, DJ GOODWIN, GM AF ALEXANDER, DJ GOODWIN, GM TI THICK-SECTION WELDMENTS IN 21-6-9 AND 316LN STAINLESS-STEEL FOR FUSION ENERGY APPLICATIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL AB The mechanical properties of several weldments in 21-6-9 and 316LN stainless steel base metals have been measured at 77 K and room temperature. Filler metals for the 21-6-9 included Nitronic 35W and 40W, 21-6-9, Inconel 82, 182, 625, and 625 PLUS. For the 316LN base metal, 316L, 316L-T3, 316L-4K-O, and Inconel 82 filler metals were used. At room temperature all of the filler metals had yield strengths that exceeded those of the base metals. At 77 K only the Nitronics and the 21-6-9 filler metals exceeded those of the base metals, and the Inconel filler metals were significantly weaker. The impact properties of the weld metals were very good at room temperature, with the exception of Inconel 625. At 77 K the impact toughness was greatly reduced for all of the filler metals, with the dramatic exception of Inconel 82. The 316L-4K-O filler metal showed higher impact energies than the other ferrite-containing filler metals, although the levels were still much lower than for the Inconel filler metals. The Inconel 82 filler had excellent fracture toughness at both temperatures. RP ALEXANDER, DJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 0 TC 1 Z9 1 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 691 EP 695 DI 10.1016/0022-3115(92)90561-X PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700009 ER PT J AU WANG, CA LIN, HT GROSSBECK, ML CHIN, BA AF WANG, CA LIN, HT GROSSBECK, ML CHIN, BA TI SUPPRESSION OF HAZ CRACKING DURING WELDING OF HELIUM-CONTAINING MATERIALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL AB Catastrophic intergranular failures of the heat-affected zone have been observed in gas tungsten arc (GTA) welds of type 316 stainless steel containing helium greater than 2.5 appm. The failures have been attributed to helium bubble growth along grain boundaries during cooling of the weld. In this study, autogenous single pass, full penetration welds without cracking were produced in type 316 stainless steel, containing 256 appm helium. These successful welds were produced by applying a compressive stress (approximately 25% of the room temperature yield stress) perpendicular to the weld joint. Experimental results show that grain boundary helium bubble growth has been effectively reoriented from grain boundaries parallel to the weld path to grain boundaries perpendicular to the weld path. These results suggest that the application of a compressive stress during welding may be used to obtain successful welds in helium-containing irradiated materials. C1 AUBURN UNIV,AUBURN,AL 36849. RP WANG, CA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 16 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 696 EP 700 DI 10.1016/0022-3115(92)90562-Y PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700010 ER PT J AU MAZIASZ, PJ AF MAZIASZ, PJ TI TEMPERATURE-DEPENDENCE OF THE DISLOCATION MICROSTRUCTURE OF PCA AUSTENITIC STAINLESS-STEEL IRRADIATED IN ORR SPECTRALLY-TAILORED EXPERIMENTS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL AB Specimens of solution-annealed (SA) and 25% cold-worked (CW) prime-candidate-alloy (PCA) austenitic stainless steel were irradiated In ORR in spectrally-tailored experiments specially designed to produce fusion-relevant He/dpa ratios (12-18 appm He/dpa). SA and CW PCA were irradiated at 330 and 400-degrees-C to 13 dpa while only CW PCA was irradiated at 60, 200, 330 and 400-degrees-C to 7.4 dpa. Cavities and fine MC precipitates were only detectable at 330 and 400-degrees-C. Dislocations were a major component of the radiation-induced microstructure at 60-400-degrees-C. Mixtures of tiny "black-spot" loops, larger Frank loops, and network components of the total dislocation structure were very temperature dependent. Both SA and CW PCA contained Frank loops and network dislocations at 330 and 400-degrees-C, with SA PCA having more of both. Frank loop concentrations were maximum at 330-degrees-C and dislocations evolved most with dose at 400-degrees-C. At 60 and 200-degrees-C, the microstructure was dominated by very dense dispersions of tiny (1-3 nm diam) "black-spot" loops. No Frank loops were found at 60-degrees-C. Surprisingly, significant radiation-induced recovery of the as-cold-worked dislocation network occurred in CW PCA at all temperatures. The nature of the radiation-induced microstructure makes a transition between 200 and 330-degrees-C. RP MAZIASZ, PJ (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. OI Maziasz, Philip/0000-0001-8207-334X NR 22 TC 28 Z9 28 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 701 EP 705 DI 10.1016/0022-3115(92)90563-Z PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700011 ER PT J AU SAWAI, T MAZIASZ, PJ KANAZAWA, H HISHINUMA, A AF SAWAI, T MAZIASZ, PJ KANAZAWA, H HISHINUMA, A TI MICROSTRUCTURAL EVOLUTION OF AUSTENITIC STAINLESS-STEELS IRRADIATED IN SPECTRALLY TAILORED EXPERIMENT IN ORR AT 400-DEGREES-C SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID HFIR AB Several different heats of austenitic stainless steel, including Japanese-PCA(JPCA), were irradiated in the spectrally tailored ORR experiment at 400-degrees-C to 7.4 dpa. The levels of helium generated were 155 appm for JPCA (16Ni, 30 wppm B) and 102 appm for standard type 316 steel (13Ni). The mean He:dpa ratio throughout the irradiation falls between 15 and 20 appm He/dpa, which is close to the He/dpa values expected for fusion. Swelling was measured by transmission electron microscopy and by precision immersion densitometry. All the CW alloys showed swelling that was at or below the detection limit of the densitometer (0.1%). No measurable swelling was detected in the SA JPCA alloy, while the highest value of 0.8% was observed in the SA high-purity alloy. One Ti-modified steel with low C also showed a relatively high swelling value of 0.5%, while standard type 316 steel showed only 0.15% swelling. TEM observation gave consistent but slightly larger values of swelling. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SAWAI, T (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 13 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 712 EP 716 DI 10.1016/0022-3115(92)90565-3 PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700013 ER PT J AU RAO, GR LEE, EH BOATNER, LA CHIN, BA MANSUR, LK AF RAO, GR LEE, EH BOATNER, LA CHIN, BA MANSUR, LK TI MULTIPLE ION-IMPLANTATION EFFECTS ON HARDNESS AND FATIGUE PROPERTIES OF FE-13CR-15NI ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID MICROSTRUCTURE; METALS AB Eight complex alloys based on the composition Fe-13Cr-15Ni-2Mo-2Mn-0.2Ti-0.8Si-0.06C were implanted simultaneously with 400 keV boron and 550 keV nitrogen, and investigated for microhardness changes and bending fatigue life. The dual implantation was found to decrease the fatigue life of all eight alloys although the implantation increased near-surface hardness of all eight alloys. This result was in contrast to the significant improvements found in the fatigue life of four B, N implanted simple Fe-13Cr-15Ni alloys. It was determined that the implantation suppressed surface slip band formation, the usual crack initiation site, but in the complex alloys, this suppression promoted a shift to grain boundary cracking. A similar phenomenon was also observed when the simple Fe-13Cr-15Ni alloys were simultaneously implanted with boron, nitrogen and carbon wherein fatigue life decreased, and again, grain boundary cracks were observed. To test the hypothesis that ion implantation made the overall surface more fatigue resistant but led to a shift to grain boundary cracking, single crystal specimens of the ternary Fe-15Cr-15Ni were also implanted with boron and nitrogen ions. The fatigue fife decreased for the single crystal specimens also, due to concentration of applied stress along fewer slip bands as compared to the control single crystal specimens where applied stress was relieved by slip band formation over the entire gauge region. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. AUBURN UNIV,AUBURN,AL 36849. RP RAO, GR (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 14 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 748 EP 753 DI 10.1016/0022-3115(92)90572-3 PN B PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700020 ER PT J AU JITSUKAWA, S MAZIASZ, PJ ISHIYAMA, T GIBSON, LT HISHINUMA, A AF JITSUKAWA, S MAZIASZ, PJ ISHIYAMA, T GIBSON, LT HISHINUMA, A TI TENSILE PROPERTIES OF AUSTENITIC STAINLESS-STEELS AND THEIR WELD JOINTS AFTER IRRADIATION BY THE ORR-SPECTRALLY-TAILORING EXPERIMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL AB Tensile specimens of the Japanese heat of PCA (JPCA) and type 316 stainless steels were irradiated in spectrally tailored capsules in the Oak Ridge Research Reactor (ORR) to a peak dose of 7.4 dpa and a peak helium level of 105 appm in the temperature range between 328 and 673 K. Specimens of type 316 steel with weld joints produced by tungsten inert gas (TIG) and electron beam (EB) welding techniques were also included. Irradiation caused both increases in flow stress and decreases in elongation. Weld joint specimens exhibited both lower strength and elongation after irradiation. The reduction of area (RA) for the TIG weld joint specimens decreased by a factor of 5 compared to unirradiated base metal specimens, however, they still fractured in a ductile mode. The EB weld joints maintained RA levels similar to that of the unirradiated base metal specimens. Post-radiation ductilities of weld joints and base metal specimens of these steels should be adequate for their application to next generation fusion experimental devices, such as the International Tokamak Experimental Reactor (ITER). C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP JITSUKAWA, S (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. OI Maziasz, Philip/0000-0001-8207-334X NR 4 TC 28 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 771 EP 775 DI 10.1016/0022-3115(92)90576-7 PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700024 ER PT J AU JITSUKAWA, S GROSSBECK, ML HISHINUMA, A AF JITSUKAWA, S GROSSBECK, ML HISHINUMA, A TI STRESS-STRAIN RELATIONS OF IRRADIATED STAINLESS-STEELS BELOW 673-K SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID HFIR; TOUGHNESS AB Most specimens, irrespective of thermo-mechanical treatment, exhibited proof stress levels of above 800 MPa and uniform elongations below 1% after irradiation in the High Flux Isotope Reactor (HFIR). Only the solution annealed specimens irradiated at a low temperature of 328 K showed uniform elongations larger than 5% and proof stresses smaller than 800 MPa. Irradiation in the High Flux Reactor (HFR) caused more hardening than did irradiation in the HFIR. Ductility loss and change in work hardening characteristics by HFR irradiation were evaluated from reduction of area values. Residual ductility was revealed to be larger than 0.5 in natural strain, and the irradiation was estimated to have a small effect on work hardening characteristics and on fracture stress. The ductility of the irradiated alloys was found to be about 58% of that for the unirradiated alloys, as has been previously reported for irradiation in the HFIR. It was also demonstrated that true stress-strain relations, except for the fracture conditions, could be represented by Swift's type constitutive equation. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP JITSUKAWA, S (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 17 TC 25 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 790 EP 794 DI 10.1016/0022-3115(92)90580-E PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700028 ER PT J AU TOLOCZKO, MB GARNER, FA EIHOLZER, CR AF TOLOCZKO, MB GARNER, FA EIHOLZER, CR TI DETERMINATION OF THE CREEP COMPLIANCE AND CREEP SWELLING COUPLING COEFFICIENT FOR NEUTRON-IRRADIATED TITANIUM-MODIFIED STAINLESS-STEELS AT SIMILAR-TO-400-DEGREES-C SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID EXPOSURES; FLUENCE AB Irradiation creep data from FFTF-MOTA at approximately 400-degree-C were analyzed for PCA and eight other 20% cold-worked titanium-modified type 316 stainless steels, each of which exhibits a different transient regime of swelling. The analysis was based on the assumption that the B0 + DS creep model applies. A creep-swelling coupling coefficient of D congruent-to 0.6 X 10(-2) MPa-1 was found for all steels that had developed a significant level of swelling. This is in agreement with the results of earlier studies conducted in EBR-II on other stainless steels. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. WESTINGHOUSE HANFORD CO, RICHLAND, WA 99352 USA. RP TOLOCZKO, MB (reprint author), UNIV CALIF BERKELEY, BERKELEY, CA 94720 USA. NR 18 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 803 EP 807 DI 10.1016/0022-3115(92)90583-7 PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700031 ER PT J AU GROSSBECK, ML MAZIASZ, PJ ROWCLIFFE, AF AF GROSSBECK, ML MAZIASZ, PJ ROWCLIFFE, AF TI MODELING OF STRENGTHENING MECHANISMS IN IRRADIATED FUSION-REACTOR 1ST WALL ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID AUSTENITIC STAINLESS-STEEL; SEGREGATION AB Tensile property evaluations of austenitic stainless steels irradiated at 60 to 400-degrees-C in the ORR have been conducted. The neutron spectrum was tailored to achieve the appropriate helium/dpa ratio for austenitic stainless steels in a fusion reactor. The components of the alloy microstructure considered to contribute to strengthening are black dot defect clusters, Frank loops, network dislocations, voids, bubbles, and precipitates. Accepted expressions for hardening by defect interactions were employed in the calculation. It was found that the strengthening could be accounted for by the observed defects at temperatures below 330-degrees-C. However, strength was underpredicted at the higher temperatures. Since the voids and precipitates were observed to nearly always occur in coupled pairs, they were considered to be one large defect contributing to hardening through the Orowan bowing mechanism. This mechanism alone could not account for the strengthening observed. However, radiation-induced segregation of alloy components to the bubbles could account for the observed hardening, although defects below the limit of detectability are also believed to make a contribution. RP GROSSBECK, ML (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 36 Z9 36 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 808 EP 812 DI 10.1016/0022-3115(92)90584-8 PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700032 ER PT J AU WANG, CA KLUEH, RL CHIN, BA AF WANG, CA KLUEH, RL CHIN, BA TI THE WELDABILITY OF LOW ACTIVATION CR-W STEELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID BEHAVIOR; REACTOR AB A series of chromium-tungsten ferritic steels patterned on the chromium-molybdenum alloys, 2 1/4Cr-1Mo, 9Cr-1MoVNb and 12Cr-1MoVW, were tested for weldability. These steels are being developed as candidates for the first wall and blanket structure of fusion reactors. Use of these materials will minimize the long-term radioactive hazards associated with disposal after service. In these low activation alloys, long half-life elements (Mo and Nb), which become activated during irradiation, are replaced. Autogenous bead-on-plate welds were performed using the gas tungsten arc welding process. Experimental results showed that all welds were free of cracks. Sound welds were achieved in 2 1/4 and 5% Cr-W low activation steels while loss of ductility was observed in 9 and 12% Cr-W steels. This result suggests that post-weld heat treatment is necessary to restore toughness to the 9-12% Cr-W steels. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WANG, CA (reprint author), AUBURN UNIV,AUBURN,AL 36849, USA. NR 18 TC 5 Z9 5 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 831 EP 835 DI 10.1016/0022-3115(92)90589-D PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700037 ER PT J AU KOHNO, Y GELLES, DS KOHYAMA, A TAMURA, M HISHINUMA, A AF KOHNO, Y GELLES, DS KOHYAMA, A TAMURA, M HISHINUMA, A TI IRRADIATION RESPONSE OF A REDUCED ACTIVATION FE-8CR-2W MARTENSITIC STEEL (F82H) AFTER FFTF IRRADIATION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL AB The tungsten-stabilized martensitic steel F82H (Fe-8Cr-2W-0.1C-V,Ta,B) was examined after FFTF irradiation to fluences as high as 37 dpa over the temperature range of 365 to 750-degrees-C. TEM microstructural observations showed that the tempered martensitic structure was quite stable below 405-degrees-C. At 550-degrees-C, slight recovery of martensite lath structure was recognizable, concurrent with the coarsening of carbide particles. Above 670-degrees-C, the martensite lath structure was eliminated. Cavity formation was observed only at or below 405-degrees-C irradiation. The maximum swelling was measured to be as high as 0.14% at 405-degrees-C. Analysis of precipitate extraction replicas showed superior phase stability for F82H during irradiation. Precipitates identified in the irradiated specimens were M23C6 and Laves, the same phases that were identified following thermal aging. Radiation-induced precipitates other than M23C6 or Laves were not observed. Based on these microstructural observations, superior mechanical properties may be expected for F82H after irradiation. C1 BATELLE PACIFIC NW LAB,DEPT MAT SCI,RICHLAND,WA 99352. NIPPON KOKAN KK,STEEL RES CTR,KAWASAKI KU,KAWASAKI 210,JAPAN. JAPAN ATOM RES INST,DEPT FUELS & MAT RES,TOKAI,IBARAKI 31911,JAPAN. RP KOHNO, Y (reprint author), UNIV TOKYO,DEPT MAT SCI,BUNKYO KU,TOKYO 113,JAPAN. NR 13 TC 25 Z9 25 U1 3 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 868 EP 873 DI 10.1016/0022-3115(92)90597-E PN B PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700045 ER EF