FN Thomson Reuters Web of Science™ VR 1.0 PT J AU BROWN, TD BREEDING, RJ HELTON, JC JOW, HN HIGGINS, SJ SHIVER, AW AF BROWN, TD BREEDING, RJ HELTON, JC JOW, HN HIGGINS, SJ SHIVER, AW TI THE NUREG-1150 PROBABILISTIC RISK ASSESSMENT FOR THE GRAND-GULF-NUCLEAR-STATION SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This paper summarizes the findings of the probabilistic risk assessment (PRA) for Unit 1 of the Grand Gulf Nuclear Station performed in support of NUREG-1150. The emphasis is on the "back-end" analyses, that is, the accident progression, source term, consequence analyses, and risk results obtained when the results of these analyses are combined with the accident frequency analysis. The offsite risk from internal initiating events was found to be quite low, both with respect to the safety goals and to the other plants analyzed in NUREG-1150. The offsite risk is dominated by short-term station blackout plant damage states. The long-term station blackout group and the anticipated transients without scram (ATWS) group contribute considerably less to risk. Transients in which the power conversion system is unavailable are very minor contributors to risk. The low values for risk can be attributed to low core damage frequency, good emergency response, and plant features that reduce the potential source term. C1 SANDIA NATL LABS,DIV SPECIAL PROJECTS 6411,ALBUQUERQUE,NM 87185. ARIZONA STATE UNIV,TEMPE,AZ 85287. NR 15 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1992 VL 135 IS 1 BP 117 EP 137 DI 10.1016/0029-5493(92)90304-E PG 21 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JC312 UT WOS:A1992JC31200005 ER PT J AU NAUS, DJ KEENEYWALKER, J BASS, RB FIELDS, RJ DEWIT, R LOW, SR AF NAUS, DJ KEENEYWALKER, J BASS, RB FIELDS, RJ DEWIT, R LOW, SR TI WIDE-PLATE CRACK-ARREST TESTS UTILIZING PROTOTYPICAL AND DEGRADED (SIMULATED) PRESSURE-VESSEL STEELS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Note AB Sixteen wide-plate crack-arrest tests have been completed, ten utilizing specimens fabricated from A533B class 1 material and six fabricated from a low-upper-shelf base material. Each test utilized a single-edge notched specimen that was subjected to a linear thermal gradient along the plane of crack propagation. Test results exhibit an increase in crack-arrest toughness (K(Ia)) with temperature, with the rate of increase becoming greater as the temperature increases. When the wide-plate test results are compared with other large-specimen results, the data show a consistent trend in which the K(Ia) data extend above the limit provided in ASME Section XI. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD. RP NAUS, DJ (reprint author), OAK RIDGE NATL LAB,CONCRETE TECHNOL PROGRAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1992 VL 135 IS 2 BP 197 EP 205 DI 10.1016/0029-5493(92)90222-H PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JH420 UT WOS:A1992JH42000008 ER PT J AU FINKEN, KH BAEK, WY DIPPEL, KH RUSSO, AJ WATKINS, JG BOEDO, JA GRAY, DS AF FINKEN, KH BAEK, WY DIPPEL, KH RUSSO, AJ WATKINS, JG BOEDO, JA GRAY, DS TI ENERGY FLUX TO THE TEXTOR LIMITERS DURING DISRUPTIONS SO NUCLEAR FUSION LA English DT Article ID TOKAMAKS AB Rapidly changing heat fluxes deposited on the limiter blades are observed during disruptions by infrared (IR) scanners. These scanners are a suitable tool for the analysis of these heat fluxes because they provide both spatial and temporal information with sufficient resolution. Several new features of the power flux to the plasma facing surfaces during a disruption have been found. The disruptive heat flux occurs on three different time-scales. The fastest ones are for heat bursts with a duration of less-than-or-equal-to 0.1 ms; several of these bursts form a thermal quench of about one millisecond duration, and some of these thermal quenches are found to occur during the current decay phase. Power flux densities of the order of 50 MW/m2 have been observed during a burst. The spatial extent of the area on which this power is deposited during a burst is larger than or equal to the size of half an ALT-II blade, i.e. about 1 m in the toroidal direction. Simultaneous measurements with two cameras show that the correlation length of a single burst is smaller than half the toroidal circumference, probably of the order of half a blade or a full blade length. This is consistent with plasma islands of low mode number. The typical heat deposition patterns at the limiter blades for normal discharges are preserved during a disruption. The magnetic structure near the plasma surface can therefore not be destroyed completely during the thermal quench. The power flux follows the field lines. However, the power e-folding length is about a factor of two to three times larger than under normal discharge conditions. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RP FINKEN, KH (reprint author), FORSCHUNGSZENTRUM JULICH GMBH,ASSOC EURATOM KFA,INST PLASMAPHYS,JULICH,GERMANY. NR 27 TC 20 Z9 20 U1 1 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUN PY 1992 VL 32 IS 6 BP 915 EP 926 DI 10.1088/0029-5515/32/6/I01 PG 12 WC Physics, Fluids & Plasmas SC Physics GA JC959 UT WOS:A1992JC95900001 ER PT J AU WARD, DJ JARDIN, SC AF WARD, DJ JARDIN, SC TI EFFECTS OF PLASMA DEFORMABILITY ON THE FEEDBACK STABILIZATION OF AXISYMMETRICAL MODES IN TOKAMAK PLASMAS SO NUCLEAR FUSION LA English DT Article ID HIGHLY-ELONGATED TOKAMAK; VERTICAL STABILITY; INSTABILITY; CONFINEMENT; WALL; CODE AB The effects of plasma deformability on the feedback stabilization of axisymmetric modes of tokamak plasmas are studied. It is seen that plasmas with strongly shaped cross-sections have unstable motion different from a rigid shift. Furthermore, the placement of passive conductors is shown to modify the non-rigid components of the eigenfunction in a way that reduces the stabilizing eddy currents in these conductors. Passive feedback results obtained using several equilibria of varying shape and aspect ratio are presented. The eigenfunction is also modified under the effects of active feedback. This deformation is seen to depend strongly on the position of the flux loops that are used to determine the plasma vertical position for the active feedback system. The variations of these non-rigid components of the eigenfunction always serve to reduce the stabilizing effect of the active feedback system by reducing the measurable poloidal flux at the flux loop locations. Active feedback results are presented for the PBX-M tokamak configuration. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. RP WARD, DJ (reprint author), ECOLE POLYTECH FED LAUSANNE,ASSOC EURATOM CONFEDERAT SUISSE,CTR RECH PHYS PLASMAS,LAUSANNE,SWITZERLAND. RI Jardin, Stephen/E-9392-2010 NR 33 TC 19 Z9 19 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUN PY 1992 VL 32 IS 6 BP 973 EP 994 DI 10.1088/0029-5515/32/6/I07 PG 22 WC Physics, Fluids & Plasmas SC Physics GA JC959 UT WOS:A1992JC95900007 ER PT J AU PARK, HK BARNES, CW BUDNY, RV MCCUNE, DC TAYLOR, G ZARNSTORFF, MC AF PARK, HK BARNES, CW BUDNY, RV MCCUNE, DC TAYLOR, G ZARNSTORFF, MC TI COMPARISON OF MEASURED ELECTRON-DENSITY RISE AND CALCULATED NEUTRAL BEAM PARTICLE DEPOSITION IN THE TFTR TOKAMAK SO NUCLEAR FUSION LA English DT Letter ID ABEL-INVERSION METHOD; ATOMIC-HYDROGEN; CROSS-SECTIONS; PENETRATION; IONIZATION; TRANSPORT; PLASMAS AB The initial rate of rise of the central electron density during approximately 100 keV deuterium neutral beam injection is found to agree well with calculations of the beam deposition rate. The beam deposition calculations employ new tabulations of the atomic cross-sections and multi-step ionization (MSI) processes; the effects of using new tabulations and of including MSI processes appear to approximately cancel. The neutral beam deposition profile is a strong function of both the magnitude and the shape of the target plasma density. Peaked heating profiles can be achieved at high target densities only from peaked target density profiles. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP PARK, HK (reprint author), PRINCETON UNIV,PIRNCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 17 TC 10 Z9 10 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUN PY 1992 VL 32 IS 6 BP 1042 EP 1046 DI 10.1088/0029-5515/32/6/I13 PG 5 WC Physics, Fluids & Plasmas SC Physics GA JC959 UT WOS:A1992JC95900013 ER PT J AU AUBERT, B CIOCIO, A COLAS, J DOBRYNSKI, L GHEZ, P GUILLOUET, P KADYK, J KRYN, D LAVOCAT, P LEBASQUE, F LIMON, P MARCHAND, D MANSOULIE, B MENDIBURU, JP OCHSENBEIN, S PRIPSTEIN, M PRZYBYLSKI, G SALIN, P SAJOT, G STROVINK, M TEIGER, J THUR, W WEBER, T WENZEL, W AF AUBERT, B CIOCIO, A COLAS, J DOBRYNSKI, L GHEZ, P GUILLOUET, P KADYK, J KRYN, D LAVOCAT, P LEBASQUE, F LIMON, P MARCHAND, D MANSOULIE, B MENDIBURU, JP OCHSENBEIN, S PRIPSTEIN, M PRZYBYLSKI, G SALIN, P SAJOT, G STROVINK, M TEIGER, J THUR, W WEBER, T WENZEL, W TI A SEARCH FOR MATERIALS COMPATIBLE WITH WARM LIQUIDS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID IONIZATION CHAMBERS; TEMPERATURE; PERFORMANCE; CALORIMETER; FIELD AB This paper reports on the search undertaken since 1987 by a part of thc WALIC collaboration to find new materials for the construction of ionizing detectors filled with room temperature liquid hydrocarbons, tetramethylsilane and tetramethylpentane. We have found that several metals, glasses, plastics and glues, very promising for their mechanical, electrical, and radiation hardness properties, can be put into contact with these liquids without observing, during the drift time, any significant decrease in the lifetime of the electrons created by ionization. C1 CEA,SACLAY,FRANCE. PSI,VILLIGEN,SWITZERLAND. LAB ANNECY LE VIEUX PHYS PARTICULES,ANNECY,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP AUBERT, B (reprint author), COLL FRANCE,F-75231 PARIS 05,FRANCE. NR 18 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1992 VL 316 IS 2-3 BP 165 EP 173 DI 10.1016/0168-9002(92)90899-F PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900011 ER PT J AU JOB, PK PRICE, LE PROUDFOOT, J HANDLER, T GABRIEL, TA AF JOB, PK PRICE, LE PROUDFOOT, J HANDLER, T GABRIEL, TA TI DESIGN CONSIDERATIONS FOR A SCINTILLATING PLATE CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ENERGY AB Results of the simulation studies for the design of a scintillating plate calorimeter for an SSC detector are presented. These simulation studies have been carried out with the CALOR89 code. The results show that both lead and uranium can yield good compensation in practical sampling geometries. However, the significant delayed energy release in the uranium systems can lead to a serious pile up problem at high rates. In the energy range under consideration, an iron-scintillator system is not compensating at any absorber to scintillator ratio. An inhomogeneous calorimeter with 4-lambda of lead-scintillator in a compensating configuration followed by 4-lambda of iron-scintillator with moderate sampling is found to perform as well as a homogeneous lead-scintillator compensating calorimeter. In such inhomogeneous systems the hadronic signal from different segments are weighted by a scheme based on minimum ionizing dE/dX. We show that, in a properly optimised three segment system, compensation and good hadronic resolution can be achieved by appropriately weighting the signal from the segments. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP JOB, PK (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1992 VL 316 IS 2-3 BP 174 EP 183 DI 10.1016/0168-9002(92)90900-O PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900012 ER PT J AU BURCHAT, PR HISER, J BOYARSKI, A BRIGGS, D AF BURCHAT, PR HISER, J BOYARSKI, A BRIGGS, D TI STUDIES OF HELIUM GAS-MIXTURES IN DRIFT CHAMBERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Some properties of gas mixtures composed predominately of helium and lesser amounts of CO2 and isobutane were measured in a prototype drift chamber. The studies are motivated by the desire to reduce the multiple scattering inside the drift chamber at future high-luminosity, low-energy facilities such as phi-factories, tau/charm factories, and B factories. The low atomic number of helium greatly reduces the multiple scattering contribution to the momentum resolution compared to an argon-based gas mixture. The position resolution, pulse height, efficiency, and breakdown characteristics were measured for various gas mixtures. A mixture of 83% He, 10% CO2, and 7% isobutane gives comparable results to that of an argon-based gas commonly used in drift chambers. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP BURCHAT, PR (reprint author), UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064, USA. NR 9 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1992 VL 316 IS 2-3 BP 217 EP 222 DI 10.1016/0168-9002(92)90903-H PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900015 ER PT J AU GYULASSY, M HARLANDER, M AF GYULASSY, M HARLANDER, M TI HIGH-RESOLUTION MULTIPARTICLE TRACKING WITHOUT PREPROCESSING VIA ELASTIC TRACKING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID HIGH-ENERGY PHYSICS; NEURAL NETWORKS; PATTERN-RECOGNITION; ALGORITHM; DETECTOR AB Elastic tracking (ET) is applied to the problem of tracking noisy overlapping tracks in visual and electronic detectors. The method avoids the necessity of local preprocessing to find track centroids and utilizes global information provided by the detector to resolve small momentum differences between multiple overlapping tracks for applications such as pion interferometry. C1 TECH UNIV MUNICH,DEPT PHYS T30,W-8046 GARCHING,GERMANY. RP GYULASSY, M (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 20 TC 3 Z9 3 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 JUN 1 PY 1992 VL 316 IS 2-3 BP 238 EP 245 DI 10.1016/0168-9002(92)90905-J PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900017 ER PT J AU MATHIESON, E SMITH, GC AF MATHIESON, E SMITH, GC TI GAIN REDUCTION DUE TO SPACE-CHARGE IN A MULTIWIRE PROPORTIONAL CHAMBER IRRADIATED BY A UNIFORM BEAM OF RECTANGULAR SECTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Previous theoretical and experimental work has shown that space-charge reduction in gas gain in proportional chambers may be described by the simple relationship ln(q/q0) = -qn1k(m) I(m) Here q is the mean avalanche charge at counting rate n1 per unit length per wire, q0 the mean charge at zero rate, I(m) a constant that depends on the chamber parameters and k(m) a constant depending also on the "width" L of the chamber irradiated. The irradiation "height" H was assumed to be very large compared with anode wire spacing. It is shown below how the previous theory may be developed to treat the more general case in which the chamber is irradiated with a uniform intensity beam of rectangular section. It is found that the same simple expression applies. approximately, with k(m)(L) replaced by a two-dimensional function d(m)(L, H). C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP MATHIESON, E (reprint author), UNIV LEICESTER,LEICESTER LE1 7RH,ENGLAND. NR 5 TC 6 Z9 6 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 JUN 1 PY 1992 VL 316 IS 2-3 BP 246 EP 251 DI 10.1016/0168-9002(92)90906-K PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900018 ER PT J AU CLEMEN, M HUMANIC, T KRAUS, D VILKELIS, G REHAK, P HOLL, P GATTI, E SAMPIETRO, M KEMMER, J AF CLEMEN, M HUMANIC, T KRAUS, D VILKELIS, G REHAK, P HOLL, P GATTI, E SAMPIETRO, M KEMMER, J TI DOUBLE PARTICLE RESOLUTION MEASURED IN A SILICON DRIFT CHAMBER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DETECTORS AB The two-hit resolution of a silicon drift chamber is measured using a pulsed Nd:YAG laser and a time digitizer readout. The data is analyzed by forming the covariance matrix in time samples, and transforming to a matrix in amplitude and time variation of each of the two hits. The resolution on the two-hit separation is found to be better than 25-mu-m with a drift field of 530 V/cm and a separation of more than 500-mu-m, with the resolution increasing to 50-mu-m as the separation nears 500-mu. Results are also presented for multiply ionizing tracks. showing a great improvement over single minimum ionizing. C1 UNIV PITTSBURGH,PITTSBURGH,PA 15260. BROOKHAVEN NATL LAB,UPTON,NY 11973. CNR,CTR ELETTRON QUANTIST & STRUMENTAZ ELETTRON,I-20133 MILAN,ITALY. MAX PLANCK INST EXTRATERRESTR PHYS,W-8046 GARCHING,GERMANY. POLITECN MILAN,DIPARTIMENTO ELETTRON,I-20133 MILAN,ITALY. RI Sampietro, Marco/A-3732-2016 OI Sampietro, Marco/0000-0003-4825-9612 NR 8 TC 9 Z9 9 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 JUN 1 PY 1992 VL 316 IS 2-3 BP 283 EP 288 DI 10.1016/0168-9002(92)90911-M PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900023 ER PT J AU ROUSE, F CASTILLO, S ALLISON, S GROMME, T HENDRICKSON, L HIMEL, T KRAUTER, K SASS, R SHOAEE, H AF ROUSE, F CASTILLO, S ALLISON, S GROMME, T HENDRICKSON, L HIMEL, T KRAUTER, K SASS, R SHOAEE, H TI A DATABASE DRIVEN FAST FEEDBACK-SYSTEM FOR THE STANFORD LINEAR COLLIDER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A new feedback system has been developed that stabilizes the SLC beams at many locations. The feedback loops are designed to sample and correct at the repetition rate of the accelerator. Each loop can be distributed across several INTEL 80386 microprocessors that control the SLC hardware. A new communications system, KISNET, has been developed to pass data between the microprocessors at this rate. The software is written using the State SpaCe formalism of digital control theory and is database driven. This allows a new feedback loop to be implemented by setting Lip the on-line database and perhaps installing a communications link. Eighteen such loops have now been implemented and this has measurably improved the performance of the accelerator. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. NR 16 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1992 VL 316 IS 2-3 BP 343 EP 350 DI 10.1016/0168-9002(92)90920-Y PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900032 ER PT J AU ARYAEINEJAD, R COLE, JD GREENWOOD, RC AF ARYAEINEJAD, R COLE, JD GREENWOOD, RC TI PERFORMANCE OF HIGH-RESOLUTION SILICON PAD DETECTOR AND ASSOCIATED PREAMPLIFIER CIRCUIT-BOARD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID READOUT; SYSTEM; DIODES AB The performance of a silicon pad detector was tested at room temperature. Energy and time resolution were measured using different types of preamplifiers. An integrated circuit board was designed to handle a 20 element silicon pad detector (2 X 10). The results show that an energy resolution of about 6.7 keV for 320 keV electrons and a time resolution of 3.6 ns have been achieved at room temperature. RP ARYAEINEJAD, R (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 10 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1992 VL 316 IS 2-3 BP 354 EP 358 DI 10.1016/0168-9002(92)90922-Q PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900034 ER PT J AU LANGENBRUNNER, JL MORRIS, CL WHITTON, RM AF LANGENBRUNNER, JL MORRIS, CL WHITTON, RM TI CSI-PHOSWICH DETECTOR FOR CHARGED-PARTICLE IDENTIFICATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LANGENBRUNNER, JL (reprint author), UNIV MINNESOTA,DEPT PHYS & ASTRON,MINNEAPOLIS,MN 55455, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1992 VL 316 IS 2-3 BP 450 EP 451 DI 10.1016/0168-9002(92)90934-V PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900046 ER PT J AU ABLES, E BIONTA, R LOWRY, M MASQUELIER, D MCCAMMON, K MCCONAGHY, C WUEST, C AF ABLES, E BIONTA, R LOWRY, M MASQUELIER, D MCCAMMON, K MCCONAGHY, C WUEST, C TI OBSERVATION OF DRIFT CHAMBER SIGNALS USING A MACH-ZEHNDER ELECTROOPTIC MODULATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter ID RESOLUTION AB A Mach-Zehnder electro-optic modulator has been used to read out the charge collected on drift chamber sense wires. The modulator sensitivity is sufficient to allow measurement of the pulse waveform without preamplification of any kind. We report here initial results and discuss ongoing research and potential applications as well as projected performance improvements as we continue to optimize the system for drift chamber readout. RP ABLES, E (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 6 TC 1 Z9 1 U1 3 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 JUN 1 PY 1992 VL 316 IS 2-3 BP 452 EP 456 DI 10.1016/0168-9002(92)90935-W PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HZ799 UT WOS:A1992HZ79900047 ER PT J AU LEWIS, MB LEE, EH AF LEWIS, MB LEE, EH TI CHEMICAL G-VALUES OF ION-IRRADIATED POLYMERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID BEAM IRRADIATION AB In order to understand the ion-polymer interactions which lead to improved surface properties of ion irradiated polymers, we have made quantitative measurements of the gases evolved from the polymers polyethylene and kapton during the irradiation. The singly charged ions used for irradiation in this work were 200 keV H-2(+), 200 keV He+, 200 keV B+, and 1000 keV Ar+. The penetration depth of each of these ions is approximately one micrometer. Chemical G-values (number of molecules released per 100 eV of absorbed energy) for the gases H2, CH4, C2H2, CO, and CO2 were measured. It was found that the G-values were strongly dependent upon the ion atomic number. It was shown that this atomic number dependency could be related to the probability of atomic recoil or displacement in the bulk of the polymer. In addition, the G-values appear to be correlated with the large increases in surface hardness after ion irradiation previously measured for these polymers. RP LEWIS, MB (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 21 Z9 21 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1992 VL 69 IS 2-3 BP 341 EP 348 DI 10.1016/0168-583X(92)96028-W PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD233 UT WOS:A1992JD23300023 ER PT J AU BRICE, DK AF BRICE, DK TI SCREENED RUTHERFORD MULTIPLE-SCATTERING ESTIMATES FOR HEAVY-ION BACKSCATTERING APPLICATIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID SPECTROMETRY HIBS AB An analytical expression and an integral representation are presented for the contribution, Y(n) = SIGMA(n)DELTA-OMEGA(n), of n-event multiple scattering chains to the observed backscattering spectrum in heavy-ion backscattering (HIBS) measurements. The approximations introduced in deriving the results are chosen such that an upper limit is placed on Y(n) by the expressions. The Rutherford elastic scattering cross section is used to describe individual collisions between incident projectiles and target atoms. Screening of the Rutherford scattering cross section is included in an approximate fashion which maintains the upper limit estimate. Inelastic energy loss between collision events is assumed proportional to the projectile velocity. Specific application of these expressions is made to HIBS detection of trace amounts of heavy atom impurities on a Si surface by 200-400 keV C+ beams. The predicted multiple scattering background for this application is compared with the predicted single scattering signal for 10(10) at./cm2 of Fe, Cu, Zr, Sn, or Au, as a surface impurity. The comparison shows that the multiple scattering background poses no barrier to extending the sensitivity of HIBS detection of impurities in this mass range to levels as low as 10(8) at./cm2 for the upper part of the energy range considered. Comparison of calculations with and without screening included show that the screening of the Rutherford cross section by atomic electrons is a significant factor in preventing multiple scattering effects from interfering with HIBS spectrometry at impurity levels in the 10(10) at./cm2 range. RP BRICE, DK (reprint author), SANDIA NATL LABS,DIV 1111,ALBUQUERQUE,NM 87185, USA. NR 24 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1992 VL 69 IS 2-3 BP 349 EP 360 DI 10.1016/0168-583X(92)96029-X PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD233 UT WOS:A1992JD23300024 ER PT J AU BRUCE, AM GELLETLY, W COLVIN, GG VANISACKER, P WARNER, DD AF BRUCE, AM GELLETLY, W COLVIN, GG VANISACKER, P WARNER, DD TI NEUTRON-CAPTURE STUDIES OF OS-189 SO NUCLEAR PHYSICS A LA English DT Article DE OS-188(N,GAMMA); OS-189 (N,E-) EN = THERMAL, 2, 24KEV; MEASURED I-GAMMA, E-GAMMA, IE-, GAMMA-GAMMA ANG CORR; OS-189 DEDUCED LEVELS, J, PI, MIXING RATIOS ID ODD-A NUCLEI; STATES; REACTOR AB An extensive study of the level structure of Os-189 has been carried out using the (n, gamma) and (n, e-) reactions. The use of the average resonance capture technique ensures that the complete set of 1/2-, 3/2- states has been established up to 1500 keV in excitation energy and secondary gamma-rays have been measured in singles and coincidence to build up the detailed level scheme. The results are compared with existing Nilsson model calculations and with the results of algebraic models. None of the approaches are able to provide a satisfactory description of the negative-parity states. C1 SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BRUCE, AM (reprint author), UNIV MANCHESTER,SCHUSTER LAB,MANCHESTER M13 9PL,LANCS,ENGLAND. OI Bruce, Alison/0000-0003-2871-0517 NR 27 TC 12 Z9 12 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 JUN 1 PY 1992 VL 542 IS 1 BP 1 EP 31 DI 10.1016/0375-9474(92)90393-X PG 31 WC Physics, Nuclear SC Physics GA JB547 UT WOS:A1992JB54700001 ER PT J AU GILL, RL CHOU, WT CASTEN, RF AF GILL, RL CHOU, WT CASTEN, RF TI AXIAL ASYMMETRY IN NEARLY SYMMETRICAL DEFORMED-NUCLEI SO NUCLEAR PHYSICS A LA English DT Article ID INTERACTING-BOSON MODEL; LIMIT; STATES AB A long-standing issue in the study of deformed nuclei is whether axial asymmetry occurs because of dynamic fluctuations (gamma-softness) or as a stable (triaxial) component. This question can be conveniently addressed by exploiting certain properties of the IBA which allow the superposition of a gamma-soft potential with the traditional hamiltonian via an additional (cubic) term that incorporates a contribution to V(gamma) with a minimum at gamma = 30-degrees. With such an approach, it has been shown that nuclei with large r.m.s. asymmetry are, in fact, extremely gamma-soft. The present study concerns well deformed rare-earth nuclei with small r.m.s. gamma (gamma congruent-to 10-degrees) and focuses on the sensitivity of ratios of beta- and gamma-band energies to the degree of gamma-softness. It is found that a gamma-rigid potential results in qualitative disagreement with the data and, indeed, that the data for these nuclei consistently indicate that the inclusion of a cubic term (rigid triaxiality) makes the model predictions worse. In contrast, a gamma-soft potential is in reasonable agreement with empirical results. For most of the nuclei studied, limits on the potential yield a gamma(min) less-than-or-equal-to 15-degrees with a relative depth at the minimum of <100 keV. C1 CLARK UNIV,WORCESTER,MA 01610. RP GILL, RL (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. 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 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 1 PY 1992 VL 542 IS 1 BP 32 EP 42 DI 10.1016/0375-9474(92)90394-Y PG 11 WC Physics, Nuclear SC Physics GA JB547 UT WOS:A1992JB54700002 ER PT J AU KRIEGER, SJ BONCHE, P WEISS, MS MEYER, J FLOCARD, H HEENEN, PH AF KRIEGER, SJ BONCHE, P WEISS, MS MEYER, J FLOCARD, H HEENEN, PH TI SUPER-DEFORMATION AND SHAPE ISOMERISM - MAPPING THE ISTHMUS SO NUCLEAR PHYSICS A LA English DT Article ID SUPERDEFORMED BANDS; NUCLEI; ALIGNMENT; HG-191; SPIN AB An isthmus of shape isomerism is mapped in the region of recently discovered super-deformation by computing well depths and excitation energies for 148 nuclei in fully microscopic, HF-BCS calculations. In all instances in which super deformed isomers have been experimentally observed, our calculations have predicted well deformed second minima with excitation energies and rigid body moments of inertia consistent with the data. Predictions for additional isomers are inferred from the present work. C1 UNIV LYON 1,INST PHYS NUCL,F-69622 VILLEURBANNE,FRANCE. UNIV LYON 1,INST NATL PHYS NUCL & PHYS PARTICULES,F-69622 VILLEURBANNE,FRANCE. INST PHYS NUCL,DIV PHYS THEOR,F-91406 ORSAY,FRANCE. UNIV LIBRE BRUXELLES,B-150 BRUSSELS,BELGIUM. CENS,DEPT SCI MAT,F-91191 GIF SUR YVETTE,FRANCE. RP KRIEGER, SJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 30 TC 70 Z9 70 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 JUN 1 PY 1992 VL 542 IS 1 BP 43 EP 52 DI 10.1016/0375-9474(92)90395-Z PG 10 WC Physics, Nuclear SC Physics GA JB547 UT WOS:A1992JB54700003 ER PT J AU HWANG, RN AF HWANG, RN TI AN EXTENSION OF THE RIGOROUS POLE REPRESENTATION OF CROSS-SECTIONS FOR REACTOR APPLICATIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID PRACTICAL APPLICATIONS; MULTILEVEL AB A simplified method based on an extension of the rigorous pole representation of cross-sections has been developed to facilitate the utilization of the newly released Reich-Moore parameters in reactor applications. By using the analytical properties of each pole term with energy-independent parameters, it is possible to cast the original representation into the Humblet-Rosenfeld form in which the "background" term can be explicitly identified with pole terms attributed to outlying poles and poles with wide "width." The computational efficiency and its amenability to existing reactor codes can be enhanced significantly when the background term is replaced by a low-order rational function via nonlinear least-squares fitting. Codes have been developed to compute all pertinent parameters from any given set of Reich-Moore parameters. The method, which preserves both the rigor of the Reich-Moore cross section and the desirable features of the traditional formalisms, is readily amenable to all ENDF/B format based codes. Extensive calculations have been carried out to demonstrate the viability of the proposed method for treating the R matrix data for major nuclides given in the ENDF/B-VI files, and the results are presented. RP HWANG, RN (reprint author), ARGONNE NATL LAB,DIV REACTOR ANAL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 26 TC 6 Z9 6 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1992 VL 111 IS 2 BP 113 EP 131 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HZ974 UT WOS:A1992HZ97400001 ER PT J AU ADAMS, ML MARTIN, WR AF ADAMS, ML MARTIN, WR TI DIFFUSION SYNTHETIC ACCELERATION OF DISCONTINUOUS FINITE-ELEMENT TRANSPORT ITERATIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID DISCRETE-ORDINATES EQUATIONS AB We present a discretization of the diffusion equation that can be used to accelerate transport iterations when the transport equation is spatially differenced by a discontinuous finite element (DFE) method. That is, we present a prescription for diffusion synthetic acceleration of DFE transport iterations. (The well-known linear discontinuous and bilinear discontinuous schemes are examples of DFE transport differencings.) We demonstrate that our diffusion discretization can be obtained in any coordinate system on any grid. We show that our diffusion discretization is not strictly consistent with the transport discretization in the usual sense. Nevertheless, we find that it yields a scheme with unconditional stability and rapid convergence. Further, we find that as the optical thickness of spatial cells becomes large, the spectral radius of the iteration scheme approaches zero (i.e., instant convergence). We give analysis results for one- and two-dimensional Cartesian geometries and numerical results for one-dimensional Cartesian and spherical geometries. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV MICHIGAN, DEPT NUCL ENGN, ANN ARBOR, MI 48109 USA. NR 19 TC 31 Z9 33 U1 0 U2 0 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 0029-5639 EI 1943-748X J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1992 VL 111 IS 2 BP 145 EP 167 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HZ974 UT WOS:A1992HZ97400003 ER PT J AU JAHSHAN, SN AF JAHSHAN, SN TI THE REACTOR-PHYSICS DESIGN OF GAS-COOLED CERMET REACTORS AND THEIR POTENTIAL APPLICATION TO SPACE POWER-SYSTEMS SO NUCLEAR TECHNOLOGY LA English DT Article DE SPACE POWER; CERMET; GAS-COOLED REACTORS AB Cermet fuel elements, when integrated in a cylindrical core along with reflectors and safety and control components, constitute a very rugged reactor assembly capable of delivering hundreds of megawatts of power at power densities of several gigawatts per cubic metre (several megawatts per litre). The cermet fuel is a ceramic uranium oxide or uranium nitride fuel in a refractory metal matrix fuel element. The fuel element is hexagonal with a flat-to-flat dimension of 20 to 30 mm. Coolant channels of approximately 1-mm diam are bored along the hexagonal fuel element. A typical cylindrical active core would have a volume of approximately 6 x 10(-2) m3 (420 mm in height and diameter) with the core, reflectors, control and safety elements, core support, vessel, and reentry shield cone under 2000 kg. Depending on the particular choice of materials and desired performance characteristics, this reactor can operate at an exit temperature of up to 2700 K. The broad applications of this reactor type include steady-state space platform or lunar base power sources, burst power sources-hundreds of megawatts(thermal) power on demand within 100 s for periods of minutes, and other applications. This reactor type offers easy operational control and meets all the safety requirements for launch and reentry. Land-based development and testing can be performed easily because this fuel type has a high fission product and fissile material retention capability. This reactor concept has been developed considerably in the past few decades. The physics design of the cermet fuel reactor is performed utilizing modern computers and computer codes. This design also incorporates developments in metallurgy and fuel performance, as well as new requirements in safety and performance that have been realized since the late 1960s when this concept was first pursued. The basic fuel element is upgraded and integrated in the overall core and reactor subsystem. Two specific applications are illustrated in detail, and expansion to other applications is outlined. RP JAHSHAN, SN (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1992 VL 98 IS 3 BP 257 EP 276 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HR315 UT WOS:A1992HR31500001 ER PT J AU BRIXNER, B KLEIN, MM AF BRIXNER, B KLEIN, MM TI OPTIMIZATION TO CREATE A 4-ELEMENT LASER SCAN LENS FROM A 5-ELEMENT DESIGN SO OPTICAL ENGINEERING LA English DT Article DE OPTICAL DESIGN; GEOMETRICAL OPTICS; LENS OPTIMIZATION; LASER SCANNING; TELECENTRIC IMAGING; THICK LENS ELEMENTS ID UNDESIRABLE SHAPES; ELEMENTS AB The procedure followed in optimizing a five-element diffraction-limited laser scan lens to eliminate one of the elements is described. The starting procedure uses thicknesses found in the five-element design except for the two central positive elements, which are combined to make a single thick third element. The resulting four-element lens employs high-index glass for each element and achieves diffraction-limited performance. RP BRIXNER, B (reprint author), LOS ALAMOS NATL LAB,MAIL STOP P915,LOS ALAMOS,NM 87545, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUN PY 1992 VL 31 IS 6 BP 1257 EP 1258 DI 10.1117/12.56185 PG 2 WC Optics SC Optics GA HY192 UT WOS:A1992HY19200013 ER PT J AU RAO, KM DAY, CL JACOBSON, RA ANGELICI, RJ AF RAO, KM DAY, CL JACOBSON, RA ANGELICI, RJ TI AIR OXIDATION OF (CP-ASTERISK-RUCL2)N TO THE OXO-BRIDGED COMPLEX (CP-ASTERISK-RUCL2)2O SO ORGANOMETALLICS LA English DT Note ID REDOX PROPERTIES; RUTHENIUM; REACTIVITY AB The paramagnetic Ru(III) complex [Cp*RuCl2]n, where Cp* is eta-5-C5Me, reacts with atmospheric O2 to form the oxo-bridging Ru(IV) complex (Cu*RuCl2)2O. This complex cocrystallizes with dibeniothiophene (DBT) to give (Cp*RuCl2)20-DBT (1) as blackish brown crystals. A single-crystal X-ray structural analysis of 1 (monoclinic, P2(1)/n (No. 14); a = 9.16 (2) angstrom, b = 16.8 (1) angstrom, c = 10.75 (6) angstrom; beta = 97.1 (2)-degrees; V = 1639 (9). angstrom3) shows that the (Cp*RUCl2)2O component contains a linear Ru-O-Ru unit with significant pi-bonding, which also accounts for the diamagnetism of the complex. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 30 TC 24 Z9 24 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUN PY 1992 VL 11 IS 6 BP 2303 EP 2304 DI 10.1021/om00042a053 PG 2 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HY674 UT WOS:A1992HY67400053 ER PT J AU TANCREDI, LR VOLKOW, ND AF TANCREDI, LR VOLKOW, ND TI A THEORY OF THE MIND BRAIN DICHOTOMY WITH SPECIAL REFERENCE TO THE CONTRIBUTION OF POSITRON EMISSION TOMOGRAPHY SO PERSPECTIVES IN BIOLOGY AND MEDICINE LA English DT Article ID CENTRAL NERVOUS-SYSTEM; TENSOR NETWORK THEORY; FUNCTIONAL GEOMETRIES; CHRONIC-SCHIZOPHRENIA; VISUAL-STIMULATION; STRESS; CORTEX; METAORGANIZATION; HEMISPHERECTOMY; NORADRENALINE C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RP TANCREDI, LR (reprint author), UNIV TEXAS,SCH PUBL HLTH,HLTH LAW PROGRAM,HOUSTON,TX 77030, USA. NR 67 TC 3 Z9 3 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0031-5982 J9 PERSPECT BIOL MED JI Perspect. Biol. Med. PD SUM PY 1992 VL 35 IS 4 BP 549 EP 571 PG 23 WC History & Philosophy Of Science; Medicine, Research & Experimental SC History & Philosophy of Science; Research & Experimental Medicine GA JG701 UT WOS:A1992JG70100006 PM 1513681 ER PT J AU MITCHELL, TE CASTRO, RG CHADWICK, MM AF MITCHELL, TE CASTRO, RG CHADWICK, MM TI (112) (111) TWINS IN TETRAGONAL MOSI2 SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID HIGH-TEMPERATURE DEFORMATION; SINGLE-CRYSTALS AB Plasma-sprayed tetragonal MOSi2 has been examined by transmission electron microscopy. Growth twins are commonly observed in the microstructure. Analysis of diffraction patterns using a stereographic projection indicates that the twinning plane is {112} and the twinning direction is [111BAR]. Atomic modelling of the twin interface shows that a key element is the pseudo-hexagonal nature of the MoSi2{110BAR} planes which allows a SIGMA-2 coincidence site relationship between matrix and twin. The habit plane for the twins is commonly observed to be {110}, implying that the plane corresponds to a twist boundary. The rotation angle is almost exactly 60-degrees. It is likely that the twins result from the hexagonal-to-tetragonal transformation of MoSi2 at high temperatures. RP MITCHELL, TE (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 10 TC 16 Z9 16 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUN PY 1992 VL 65 IS 6 BP 1339 EP 1351 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA HY951 UT WOS:A1992HY95100006 ER PT J AU SKLAD, PS ANGELINI, P SEVELY, J AF SKLAD, PS ANGELINI, P SEVELY, J TI EXTENDED ELECTRON-ENERGY LOSS FINE-STRUCTURE ANALYSIS OF AMORPHOUS AL2O3 SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID EXAFS; FILMS AB Specimens of single-crystal alpha-Al2O3 in the [0001] orientation have been implanted at -185-degrees-C with either 4 x 10(16) Al cm-2 and 6 x 10(16) O cm-2 or with 4 x 10(16)Fe cm-2. In both cases, amorphous layers were produced which extended from the surface to a depth of approximately 170 nm. Investigation of the response of the amorphous material to post-implantation thermal treatments has revealed significant differences. When annealed for 1 h at 960-degrees-C in argon, the material made amorphous by implantation with a stoichiometric ratio of aluminium and oxygen recrystallized into a dual-phase microstructure consisting of gamma-Al2O3, a cubic transitional form, and epitactical alpha-Al2O3. In contrast, when treated under similar conditions, the material made amorphous by implantation with iron recrystallized completely to epitactical alpha-Al2O3. These differences suggest that fundamental structural and chemical differences exist in the as-implanted state. The analysis of extended energy loss fine structure (EXELFS) in electron energy loss spectra obtained using an analytical electron microscope has been used to investigate these differences. The Al-O interatomic distance measured in the material made amorphous by implantation with a stoichiometric ratio of aluminium and oxygen is 0.170 nm in agreement with the value measured for gamma-Al2O3, the form into which it first recrystallizes. Similarly, the Al-O interatomic distance measured for the material made amorphous by implantation with iron is 0.185 nm, which agrees with the value measured for alpha-Al2O3, the form into which it recrystallizes. The results of the EXELFS analyses confirm the existence of underlying structural differences in amorphous materials. C1 CTR ELABORAT MAT & ETUD STRUCT,OPT ELECTR LAB,F-31055 TOULOUSE,FRANCE. RP SKLAD, PS (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 23 TC 4 Z9 4 U1 0 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUN PY 1992 VL 65 IS 6 BP 1445 EP 1461 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA HY951 UT WOS:A1992HY95100014 ER PT J AU CANFIELD, PC FISK, Z AF CANFIELD, PC FISK, Z TI GROWTH OF SINGLE-CRYSTALS FROM METALLIC FLUXES SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article AB Our experience with the growth of a wide variety of intermetallic compounds from molten fluxes is reviewed. Common problems associated with this method of sample growth are discussed, as are problems and advantages of particular fluxes. RP CANFIELD, PC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 5 TC 457 Z9 457 U1 12 U2 95 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JUN PY 1992 VL 65 IS 6 BP 1117 EP 1123 DI 10.1080/13642819208215073 PG 7 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA HY950 UT WOS:A1992HY95000003 ER PT J AU SMITH, JL AF SMITH, JL TI SAMPLE-DEPENDENT PROPERTIES OF THE SUPERCONDUCTORS UBE13 AND UPT3 SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID KNIGHT-SHIFT; U1-XTHXBE13 AB The study of heavy-fermion superconductors continues in order to explore unconventional superconductivity. Problems remain with variations among samples and with conflicting results. Microstructures must be included in sample characterization. RP SMITH, JL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 16 TC 17 Z9 17 U1 3 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JUN PY 1992 VL 65 IS 6 BP 1367 EP 1371 DI 10.1080/13642819208215103 PG 5 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA HY950 UT WOS:A1992HY95000033 ER PT J AU GORDON, JE FISHER, RA PHILLIPS, NE AF GORDON, JE FISHER, RA PHILLIPS, NE TI STRONG COUPLING, FLUCTUATIONS AND THE SPECIFIC-HEAT OF YBA2CU3O7-DELTA SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID TC; SUPERCONDUCTIVITY; BEHAVIOR; GAP AB Specific-heat data on the high-temperature superconductor YBa2Cu3O7-delta provide evidence for strong coupling. The data on ceramic and single-crystal samples also indicate that, when there is a fluctuation contribution to the specific-heat anomaly at T(c), the anomaly is reduced in height. These results are consistent with the idea that an oxygen deficiency reduces gamma and enhances fluctuation effects. C1 AMHERST COLL,DEPT PHYS,AMHERST,MA 01002. RP GORDON, JE (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 23 TC 5 Z9 5 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JUN PY 1992 VL 65 IS 6 BP 1389 EP 1394 DI 10.1080/13642819208215106 PG 6 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA HY950 UT WOS:A1992HY95000036 ER PT J AU BIRGENEAU, RJ BELK, N ENDOH, Y ERWIN, RW KASTNER, MA KEIMER, B SHIRANE, G AF BIRGENEAU, RJ BELK, N ENDOH, Y ERWIN, RW KASTNER, MA KEIMER, B SHIRANE, G TI STATIC AND DYNAMIC SPIN FLUCTUATIONS IN THE SPIN-GLASS DOPING REGIME IN LA2-XSRXCUO4+DELTA SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES ID INSULATOR-METAL TRANSITION; CONDUCTIVITY; EXCITATIONS; DEPENDENCE; LA2CUO4+Y AB We review the results of neutron scattering studies of the static and dynamic spin fluctuations in crystals ot La2-xSrxCuO4+delta in the doping regime intermediate between the Neel and superconducting regions. In this regime thc in-plane resistance is linear in temperature down to approximately 80 K with a crossover due to logarithmic conductance effects at lower temperatures. The static spin correlations are well described by a simple model in which the inverse correlation length kappa(x, T) = kappa(x, 0) + kappa(0, T). The most dramatic new result is the discovery by Keimer et al. that the dynamic spin fluctuations exhibit a temperature dependence which is a simple function of omega/T for temperatures 10 K less-than-or-equal-to T less-than-or-equal-to 500 K for a wide range of energies. This scaling leads to a natural explanation of a variety of normal state properties of the copper oxides. C1 TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BIRGENEAU, RJ (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. NR 22 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 15 EP 20 DI 10.1016/0921-4526(92)90647-B PN A PG 6 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300004 ER PT J AU REBELSKY, L LIN, H MCELFRESH, MW COLLINS, MF GARRETT, JD BUYERS, WJL TORIKACHVILI, MS AF REBELSKY, L LIN, H MCELFRESH, MW COLLINS, MF GARRETT, JD BUYERS, WJL TORIKACHVILI, MS TI THE MAGNETIC PHASE-DIAGRAM OF UNI2SI2 SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES AB Neutron diffraction and magnetization measurements as a function of applied magnetic field are reported for single crystal UNi2Si2. The combined results are used to construct a magnetic phase diagram for applied fields along c. The simple body-centered antiferromagnetic phase, stable in zero field from 55 K to 103 K, is suppressed completely by fields greater than 3.8 T. There is a reentrant triple point at 102.8 K and 2.1 T. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. MCMASTER UNIV,DEPT PHYS,HAMILTON L8S 4M1,ONTARIO,CANADA. MCMASTER UNIV,INST MAT RES,HAMILTON L8S 4M1,ONTARIO,CANADA. ATOM ENERGY CANADA LTD,CHALK RIVER K0J 1J0,ONTARIO,CANADA. SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182. RP REBELSKY, L (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 5 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 43 EP 45 DI 10.1016/0921-4526(92)90654-B PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300011 ER PT J AU PYNN, R STIRLING, WG SEVERING, A AF PYNN, R STIRLING, WG SEVERING, A TI THE COMMENSURATE SPIN EXCITATION IN CHROMIUM - A POLARIZED NEUTRON INVESTIGATION SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES ID MAGNETIC EXCITATIONS AB A polarised neutron experiment with neutron energy analysis has been performed with a single-Q sample of chromium in a large magnetic field. The 4-meV "commensurate" mode is found to involve spin fluctuations parallel to the ordered chromium moments. C1 INST LAUE LANGEVIN,F-38032 GRENOBLE,FRANCE. UNIV KEELE,DEPT PHYS,KEELE ST5 5BG,STAFFS,ENGLAND. RP PYNN, R (reprint author), LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545, USA. NR 8 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 203 EP 205 DI 10.1016/0921-4526(92)90707-Y PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300064 ER PT J AU BONI, P SHIRANE, G MARTINEZ, JL MOOK, HA AF BONI, P SHIRANE, G MARTINEZ, JL MOOK, HA TI SPIN FLUCTUATIONS IN NI ABOVE TC - COMPARISON WITH RG SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES ID PARAMAGNETIC NEUTRON-SCATTERING; DYNAMICAL CORRELATION-FUNCTION; TEMPERATURE-DEPENDENCE; ISOTROPIC FERROMAGNETS; CROSSOVER AB Constant energy scans in neutron scattering provide a very sensitive tool for comparing theoretical lineshapes with experiment. In order to verify the predictions of asymptotic renormalization group theory (aRG) for isotropic ferromagnets above T(c) we measured the temperature dependence of thc paramagnetic scattering from the itinerant 3-d ferromagnet Ni at small q values. The agreement with the theory is good near T(c) for excitation energies H-omegaBAR < k(B)T(c). Further away from T(c) serious discrepancies occur, mainly because the spin fluctuations slow down more quickly than expected on the basis of asymptotic renormalization group theory and mode mode coupling theory. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RP BONI, P (reprint author), PAUL SCHERRER INST,CH-5232 VILLIGEN PSI,SWITZERLAND. RI Martinez, Jose/B-5371-2013 OI Martinez, Jose/0000-0001-9046-8237 NR 13 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 219 EP 221 DI 10.1016/0921-4526(92)90713-3 PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300070 ER PT J AU BUYERS, WJL TUN, Z HARRISON, A RAYNE, JA NICKLOW, RM AF BUYERS, WJL TUN, Z HARRISON, A RAYNE, JA NICKLOW, RM TI HALDANE GAP IN RBNICL3 SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES ID QUANTUM ENERGY-GAP; ANTIFERROMAGNETIC CHAIN; SPIN CHAINS; CSNICL3 AB The observation of Haldane gap in the one-dimensional (1D) phase of RbNiCl3 is reported for the first time. Its behavior with change in temperature is compared to that of CsNiCl3 and also to that of NENP, a Heisenberg antiferromagnet with highly isolated Ni2+ chains. C1 MCMASTER UNIV,HAMILTON L8S 4M1,ONTARIO,CANADA. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP BUYERS, WJL (reprint author), ATOM ENERGY CANADA LTD,RES,CHALK RIVER LABS,CHALK RIVER K0J 1J0,ONTARIO,CANADA. NR 22 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 222 EP 224 DI 10.1016/0921-4526(92)90714-4 PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300071 ER PT J AU MEZEI, F CANFIELD, PC SCHARPF, O AF MEZEI, F CANFIELD, PC SCHARPF, O TI CHANGE OF MAGNETIC SHORT-RANGE ORDER AT METAL-INSULATOR PHASE-TRANSITION SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES AB The wave number dependent susceptibility in V5O9 shows that the jump of susceptibility at the metal-insulator transition is not due to antiferromagnetic correlations expected in a Mott insulator, but to the onset of ferromagnetic correlations in the metallic phase with a small, itinerant type V moment of 0.6-mu(B) in both phases. C1 LOS ALAMOS NATL LAB, MSC, LOS ALAMOS, NM 87545 USA. INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE. RP MEZEI, F (reprint author), HAHN MEITNER INST KERNFORSCH BERLIN GMBH, POSTFACH 390128, W-1000 BERLIN 39, GERMANY. NR 4 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 361 EP 362 DI 10.1016/0921-4526(92)90760-P PN A PG 2 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300117 ER PT J AU CUBITT, R FORGAN, EM PAUL, DM LEE, SL ABELL, JS MOOK, H TIMMINS, PA AF CUBITT, R FORGAN, EM PAUL, DM LEE, SL ABELL, JS MOOK, H TIMMINS, PA TI NEUTRON-DIFFRACTION BY THE FLUX LATTICE IN HIGH-TC SUPERCONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES AB The degree of perfection of flux lattices in superconductors in the mixed state, that may be obtained from small-angle neutron diffraction data, is discussed. C1 UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RP CUBITT, R (reprint author), UNIV BIRMINGHAM,SUPERCONDUCT RES GRP,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. RI cubitt, robert/B-9408-2008; Lee, Stephen/G-9791-2016 OI Lee, Stephen/0000-0002-2020-3310 NR 6 TC 26 Z9 26 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 377 EP 379 DI 10.1016/0921-4526(92)90765-K PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300122 ER PT J AU BROWN, PJ HAYDEN, SM LANDER, GH ZARETSKY, J STASSIS, C METCALF, P HONIG, JM AF BROWN, PJ HAYDEN, SM LANDER, GH ZARETSKY, J STASSIS, C METCALF, P HONIG, JM TI OBSERVATION OF INCOMMENSURATE 2-DIMENSIONAL MAGNETIC CORRELATIONS IN LA1.8SR0.2NIO4 SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES ID SUPERCONDUCTING LA2-XSRXCUO4; SPIN; MODEL AB Neutron experiments on a single crystal of La1.8Sr0.2NiO4 show that short-range two-dimensional correlations exist within the Ni-O planes. At low temperature they are of sufficient duration (>10(-11) s) to appear in the elastic energy window of the spectrometer. We discuss various physical models for the spin correlations and present calculations on an antiphase domain model, which qualitatively simulates the observations. C1 UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,W-7500 KARLSRUHE,GERMANY. AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. RP BROWN, PJ (reprint author), INST MAX VON LAUE PAUL LANGEVIN,156X,F-38042 GRENOBLE,FRANCE. RI Hayden, Stephen/F-4162-2011 OI Hayden, Stephen/0000-0002-3209-027X NR 16 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 380 EP 382 DI 10.1016/0921-4526(92)90766-L PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300123 ER PT J AU PYNN, R HAMILTON, WA SMITH, GS AF PYNN, R HAMILTON, WA SMITH, GS TI USING NEUTRONS TO EXPLORE SURFACE-ROUGHNESS SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES AB Striking patterns of diffuse scattering have been obtained at LANSCE by reflecting neutrons from thin films of titanium deposited on sapphire. Calculations of diffuse surface scattering using the distorted wave Born approximation show that these patterns result because there is strong correlation between the two rough surfaces of the film. RP PYNN, R (reprint author), LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545, USA. NR 7 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 465 EP 467 DI 10.1016/0921-4526(92)90793-R PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300150 ER PT J AU KANAYA, T OHKURA, M KAJI, K FURUSAKA, M MISAWA, M YAMAOKA, H WIGNALL, GD AF KANAYA, T OHKURA, M KAJI, K FURUSAKA, M MISAWA, M YAMAOKA, H WIGNALL, GD TI SMALL-ANGLE NEUTRON-SCATTERING FROM POLY(VINYL ALCOHOL) GELS SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND SP UK SCI & ENGN RES COUNCIL, COMMISS EUROPEAN COMMUNITIES AB Structural studies have been performed on poly(vinyl alcohol) (PVA) gels formed in mixtures of dimethylsulfoxide and water at 23-degrees-C by means of small angle and wide angle neutron scattering techniques in a wide Q range of 0.003-10 angstrom-1. C1 NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. KYOTO UNIV,INST RES REACTOR,KUMATORI,OSAKA 59004,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KANAYA, T (reprint author), KYOTO UNIV,INST CHEM PHYS,UJI,KYOTO 611,JAPAN. OI Wignall, George/0000-0002-3876-3244 NR 6 TC 12 Z9 12 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 549 EP 551 DI 10.1016/0921-4526(92)90820-I PN A PG 3 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300177 ER PT J AU BELLISSENTFUNEL, MC TEIXEIRA, J BRADLEY, KF CHEN, SH CRESPI, HL AF BELLISSENTFUNEL, MC TEIXEIRA, J BRADLEY, KF CHEN, SH CRESPI, HL TI SINGLE-PARTICLE DYNAMICS OF HYDRATION WATER IN PROTEIN SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND ID MOLECULAR-DYNAMICS; SIMULATION; SCATTERING AB Incoherent quasi-elastic and inelastic neutron scattering studies of in vivo deuterated C-phycocyanin have been made. At full hydration the high-temperature data can be interpreted using a model where each water molecule is diffusing in a confined space of 3 angstrom in radius. The excess elastic intensity at large Q indicates that a relatively low fraction of water molecules attached to the immediate vicinity of the protein surface is immobile, in agreement with computer simulation. The translational and librational density of states show slight up-shifts from the corresponding bulk cases. C1 MIT,DEPT NUCL ENGN,CAMBRIDGE,MA 02139. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP BELLISSENTFUNEL, MC (reprint author), CENS,CNRS,CEA,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. RI Teixeira, Jose/E-6084-2010 NR 15 TC 56 Z9 56 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 740 EP 744 DI 10.1016/0921-4526(92)90453-Y PN B PG 5 WC Physics, Condensed Matter SC Physics GA JD727 UT WOS:A1992JD72700056 ER PT J AU ARAI, M HANNON, AC TAYLOR, AD WRIGHT, AC SINCLAIR, RN PRICE, DL AF ARAI, M HANNON, AC TAYLOR, AD WRIGHT, AC SINCLAIR, RN PRICE, DL TI HIGH-RESOLUTION S(Q, E) MEASUREMENT ON G-SIO2 SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND ID SCATTERING; GLASSES; NEUTRON; SIO2 AB High energy resolution S(Q, E) measurements on g-SiO2 clarified the details of the VDOS, showing additionally a broad hump at 69 meV and weak sharp peaks at 63 meV and 77 meV. The paper discusses the Q dependence of the VDOS using a model and presents a dynamical pair correlation function. C1 RUTHERFORD APPLETON LAB,ISIS FACIL,DIDCOT OX11 0QX,OXON,ENGLAND. HARWELL LAB,DIV MAT PHYS & MET,DIDCOT OX11 0RA,OXON,ENGLAND. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV READING,JJ THOMSON PHYS LAB,READING RG6 2AF,BERKS,ENGLAND. RI Price, David Long/A-8468-2013; OI Hannon, Alex/0000-0001-5914-1295 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 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 779 EP 781 DI 10.1016/0921-4526(92)90465-5 PN B PG 3 WC Physics, Condensed Matter SC Physics GA JD727 UT WOS:A1992JD72700068 ER PT J AU ALTORFER, F BUHRER, W ANDERSON, I SCHARPF, O BILL, H CARRON, PL SMITH, HG AF ALTORFER, F BUHRER, W ANDERSON, I SCHARPF, O BILL, H CARRON, PL SMITH, HG TI LITHIUM DIFFUSION IN THE SUPERIONIC CONDUCTOR LI2S SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND AB We have used quasielastic neutron scattering with polarization analysis to study the diffusion of Li in a single crystal of Li2S at 1170 K. Although Li2S shows a diffuse phase transition at 800 K the quasielastic scattering is purely incoherent and may be described in terms of a simple Chudley-Elliot model. C1 PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. INST LAUE LANGEVIN,F-38000 GRENOBLE,FRANCE. DEPT CHIM PHYS,CH-1211 GENEVA,SWITZERLAND. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830. RP ALTORFER, F (reprint author), ETH ZENTRUM,LABOR NEUTRONENSTREUUNG,CH-5232 VILLIGEN,SWITZERLAND. NR 5 TC 6 Z9 6 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 795 EP 797 DI 10.1016/0921-4526(92)90471-4 PN B PG 3 WC Physics, Condensed Matter SC Physics GA JD727 UT WOS:A1992JD72700074 ER PT J AU TASSET, F CHUPP, TE PIQUE, JP STEINHOF, A THOMPSON, A WASSERMAN, E ZIADE, M AF TASSET, F CHUPP, TE PIQUE, JP STEINHOF, A THOMPSON, A WASSERMAN, E ZIADE, M TI 1ST-TEST AT ILL OF A GASEOUS HE-3 NEUTRON POLARIZATION FILTER SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND AB Polarized He-3, a promising method for the filtering of the neutron spin, is becoming a reality owing to the development of optical pumping methods and new solid state lasers. We have used a fully polarized neutron beam of 0.84 angstrom wavelength to monitor the He-3 polarization in a Rb/He-3 gas mixture pumped with a titanium-sapphire laser. C1 HARVARD UNIV,PHYS LAB,CAMBRIDGE,MA 02138. UNIV JOSEPH FOURIER GRENOBLE,SPECTROMETRIE PHYS LAB,ST MARTIN DHERES,FRANCE. MIT,CAMBRIDGE,MA 02139. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TASSET, F (reprint author), INST LAUE LANGEVIN,BP 156,F-38042 GRENOBLE 9,FRANCE. NR 16 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 896 EP 898 DI 10.1016/0921-4526(92)90502-J PN B PG 3 WC Physics, Condensed Matter SC Physics GA JD727 UT WOS:A1992JD72700105 ER PT J AU HOLDEN, TM ROOT, JH TENNANT, DC HOSBONS, RR HOLT, RA MAHIN, KW LEGGETT, D AF HOLDEN, TM ROOT, JH TENNANT, DC HOSBONS, RR HOLT, RA MAHIN, KW LEGGETT, D TI INDUSTRIAL-RESEARCH AND DEVELOPMENT AND THE ROLE OF NEUTRON-DIFFRACTION SO PHYSICA B LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON NEUTRON SCATTERING ( ICNS 91 ) CY AUG 27-30, 1991 CL OXFORD, ENGLAND AB The property of thermal neutrons that makes them valuable for studying industrial structures is their high penetration through most materials. This means that neutron diffraction can be used as a non-destructive probe for obtaining information about material properties deep inside engineering components. To a large extent we have developed the techniques in response to pressing problems of industry such as the need to measure residual stress fields, the need to understand the grain-to-grain interaction stresses that drive initial growth transients in nuclear reactor materials, and the need to measure temperature and stresses non-invasively in operating engines. C1 PRATT & WHITNEY CANADA INC,LONGEUIL J4G 1A1,QUEBEC,CANADA. SANDIA NATL LABS,LIVERMORE,CA 94550. RP HOLDEN, TM (reprint author), ATOM ENERGY CANADA LTD,CHALK RIVER NUCL LABS,CHALK RIVER K0J 1J0,ONTARIO,CANADA. NR 13 TC 8 Z9 8 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 1014 EP 1020 DI 10.1016/0921-4526(92)90538-4 PN B PG 7 WC Physics, Condensed Matter SC Physics GA JD727 UT WOS:A1992JD72700141 ER PT J AU ALLENSPACH, P MESOT, J STAUB, U FURRER, A BLANK, H MUTKA, H OSBORN, R TAYLOR, A MALETTA, H KRAMER, MJ YOO, SI KALDIS, E KARPINSKI, J RUSIECKI, S AF ALLENSPACH, P MESOT, J STAUB, U FURRER, A BLANK, H MUTKA, H OSBORN, R TAYLOR, A MALETTA, H KRAMER, MJ YOO, SI KALDIS, E KARPINSKI, J RUSIECKI, S TI NEUTRON SPECTROSCOPY OF ND1-V+YCAVBA2-YCU3+ZOX SO PHYSICA B-CONDENSED MATTER LA English DT Article ID CRYSTAL-FIELD; SUPERCONDUCTIVITY AB The crystal field splitting in the high T(c) superconductor Nd1-v+yCavBa2-yCu3+zOx (v = 0, 0.5; y = 0, 0.25, 0.5; z = 0, 0.5; 6.02 less-than-or-equal-to x less-than-or-equal-to 7.05) was observed by neutron spectroscopy. The charge transfer connected with doping could directly be measured by this local probe of the charge distribution around the rare earth site, and the determined values turned out to be comparable with that obtained by other methods. C1 INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. FORSCHUNGSZENTRUM JULICH, INST SOLID STATE PHYS, W-5170 JULICH 1, GERMANY. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. SWISS FED INST TECHNOL, SOLID STATE PHYS LAB, CH-8093 ZURICH, SWITZERLAND. RP ETH ZURICH, NEUTRON SCATTERING LAB, CH-5232 VILLIGEN PSI, SWITZERLAND. RI Osborn, Raymond/E-8676-2011; Yoo, Sang-Im/C-8565-2014; Staub, Urs/C-4914-2015 OI Osborn, Raymond/0000-0001-9565-3140; NR 11 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 389 EP 392 DI 10.1016/0921-4526(92)90768-N PN A PG 4 WC Physics, Condensed Matter SC Physics GA JD723 UT WOS:A1992JD72300125 ER PT J AU HEMPELMANN, R RICHTER, D PRICE, DL REITER, G AF HEMPELMANN, R RICHTER, D PRICE, DL REITER, G TI HYDROGEN POTENTIAL IN BETA-V2H STUDIED BY DEEP INELASTIC NEUTRON-SCATTERING SO PHYSICA B-CONDENSED MATTER LA English DT Article AB Two complementary techniques of deep inelastic neutron scattering were used to study hydrogen in beta-V2H. (i) By means of neutron vibrational spectroscopy we measured hydrogen vibrations up to the fourteenth order; from these data we derived the effective single-particle potential, the shape of which is a parabola with a flattened bottom, and the hydrogen wave functions. (ii) By means of neutron Compton scattering we determined the kinetic energy of the hydrogen; the value agrees with that calculated from the vibrational ground-state wave function. C1 UNIV HOUSTON, DEPT PHYS, HOUSTON, TX 77004 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP HEMPELMANN, R (reprint author), FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY. RI Price, David Long/A-8468-2013; Richter, Dieter/H-3701-2013 OI Richter, Dieter/0000-0003-0719-8470 NR 4 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1992 VL 180 BP 651 EP 652 DI 10.1016/0921-4526(92)90423-P PG 2 WC Physics, Condensed Matter SC Physics GA JD727 UT WOS:A1992JD72700026 ER PT J AU VANDERBEEK, CJ KES, PH MALEY, MP MENKEN, MJV MENOVSKY, AA AF VANDERBEEK, CJ KES, PH MALEY, MP MENKEN, MJV MENOVSKY, AA TI FLUX PINNING AND CREEP IN THE VORTEX GLASS PHASE IN BI2SR2CACU2O8+DELTA SINGLE-CRYSTALS SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; HIGH-TEMPERATURE SUPERCONDUCTORS; BA-CU-O; LIQUIDS AB Measurements of the relaxation of the non-equilibrium magnetic moment of Bi2Sr2CaCu2O8+delta-single crystals in fields between 0.1 and 12 T are used to study the low-temperature vortex state in this extremely anisotropic material. From the data, we obtain (1) the critical current density at T=0, j(c)(0); (2) the flux-flow resistivity at j=j(c)(0); (3) the flux-creep activation barrier U as function of current density j, induction B and temperature T. From collective pinning theory, it is found that (two-dimensional) point vortices in the CuO2-layers are pinned individually. The flux-creep activation barrier is well described by two-dimensional collective creep theory at sufficiently high current density. Although low-current U(j)-data are inconclusive as to the nature of the low-temperature vortex state, critical scaling analysis shows that it is most likely a vortex glass, with vanishing linear resistivity at zero current density. Above the second-order phase transition at T(G), the same activation barrier is measured as in previously published AC-susceptibility experiments. Deviations from critical scaling at low magnetic fields find an explanation if the vortex-glass transitions is viewed as the phase-decoupling line suggested by Glazman and Koshelev [Phys. Rev. B 43 (1991) 2835], but in the presence of pinning. C1 LOS ALAMOS NATL LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. UNIV AMSTERDAM,VANDERWAALS ZEEMAN LAB,1000 HE AMSTERDAM,NETHERLANDS. RP VANDERBEEK, CJ (reprint author), LEIDEN UNIV,KAMERLINGH ONNES LAB,POB 9506,2300 RA LEIDEN,NETHERLANDS. NR 49 TC 85 Z9 85 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1992 VL 195 IS 3-4 BP 307 EP 322 DI 10.1016/0921-4534(92)90355-G PG 16 WC Physics, Applied SC Physics GA HZ233 UT WOS:A1992HZ23300013 ER PT J AU SEIDLER, GT ROSENBAUM, TF HAN, PD PAYNE, DA VEAL, BW AF SEIDLER, GT ROSENBAUM, TF HAN, PD PAYNE, DA VEAL, BW TI CRITICAL FIELDS AND FLUX PINNING IN SINGLE-CRYSTAL BA1-XKXBIO3 SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; BA0.6K0.4BIO3; CREEP AB We report DC magnetization measurements of high quality single crystals of superconducting Ba0.63K0.37BiO3 with T(c) = 29 K, yielding values for the upper and lower critical fields, the low field critical current, the magnetization relaxation rate, and the activation energy for flux motion. We contrast the magnetization relaxation results for isotropic Ba0.63K0.37BiO3 with those obtained on highly anisotropic oxygen deficient single crystals of YBa2Cu3O7-delta with delta = 0.58 and a comparable T(c)= 35 K. C1 UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NATL SCI FDN,SCI & TECHNOL CTR SUPERCOND,WASHINGTON,DC 20550. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. RP SEIDLER, GT (reprint author), UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637, USA. RI Seidler, Gerald/I-6974-2012 NR 24 TC 16 Z9 16 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1992 VL 195 IS 3-4 BP 373 EP 378 DI 10.1016/0921-4534(92)90363-H PG 6 WC Physics, Applied SC Physics GA HZ233 UT WOS:A1992HZ23300021 ER PT J AU RESCIGNO, TN LENGSFIELD, BH MCCURDY, CW PARKER, SD AF RESCIGNO, TN LENGSFIELD, BH MCCURDY, CW PARKER, SD TI ABINITIO DESCRIPTION OF POLARIZATION IN LOW-ENERGY ELECTRON COLLISIONS WITH POLAR-MOLECULES - APPLICATION TO ELECTRON-NH3 SCATTERING SO PHYSICAL REVIEW A LA English DT Article ID KOHN VARIATIONAL METHOD; ROTATIONAL-EXCITATION; POLYATOMIC-MOLECULES; IMPACT; NH3 AB We report the results of a theoretical study of low-energy electron-NH3 SCattering in which target polarization effects are included by using an ab initio optical potential. The calculations employ the complex Kohn variational technique and are undertaken at both the static-exchange and polarized-self-consistent-field levels. Particular attention is paid to the complications attending electron scattering from target molecules that possess a permanent dipole moment. We describe the steps necessary to extract meaningful differential cross sections from fixed-nuclei calculations that ignore the rotational motion of the target. Good agreement is found between our results and recent experimental measurements. C1 LAWRENCE LIVERMORE NATL LAB,NATL ENERGY RES SUPERCOMP CTR,LIVERMORE,CA 94550. OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. RP RESCIGNO, TN (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 44 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 JUN 1 PY 1992 VL 45 IS 11 BP 7800 EP 7809 DI 10.1103/PhysRevA.45.7800 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700022 ER PT J AU KIMURA, M KRAJCARBRONIC, I DILLON, M INOKUTI, M AF KIMURA, M KRAJCARBRONIC, I DILLON, M INOKUTI, M TI ELECTRON DEGRADATION AND YIELDS OF INITIAL PRODUCTS - THE FANO FACTOR FOR MIXTURES OF ARGON AND MOLECULAR-HYDROGEN SO PHYSICAL REVIEW A LA English DT Article ID BINARY-MIXTURES; IRRADIATION AB Electron-degradation spectra, ionization yields, and Fano factors for Ar-H2 gaseous mixtures are rigorously studied using the Spencer-Fano theory along with a realistic set of electron collision cross sections. The present study elucidates the relation between the Fano factor and ionization cross sections and indicates principles underlying statistical fluctuations of the ionization yield. Our results show a smooth composition dependence of the Fano factor for a mixture. C1 RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RUDJER BOSKOVIC INST,YU-41001 ZAGREB,YUGOSLAVIA. RP KIMURA, M (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 12 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 7831 EP 7837 DI 10.1103/PhysRevA.45.7831 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700025 ER PT J AU CLARK, MW TANIS, JA BERNSTEIN, EM BADNELL, NR DUBOIS, RD GRAHAM, WG MORGAN, TJ PLANO, VL SCHLACHTER, AS STOCKLI, MP AF CLARK, MW TANIS, JA BERNSTEIN, EM BADNELL, NR DUBOIS, RD GRAHAM, WG MORGAN, TJ PLANO, VL SCHLACHTER, AS STOCKLI, MP TI CROSS-SECTIONS FOR RESONANT TRANSFER AND EXCITATION IN FEQ++H-2 COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID L-SHELL EXCITATION; DIELECTRONIC-RECOMBINATION; RELATIVISTIC AUGER; ELECTRON-TRANSFER; IONS; RATES; CONFIGURATION; OXYGEN; H-2; HE AB Resonant transfer and excitation (RTE) is investigated for Fe(q+) ions (q=23, 24, and 25) colliding with H2. For each charge state, cross sections for RTE were obtained from measurements of K x rays, emitted from the doubly excited intermediate state, coincident with single-electron capture by the incident ion. Additionally, for Fe25+ cross sections were obtained from measurements of coincidences between the two K x rays emitted from the intermediate state. These latter measurements Provide information on the lifetimes of intermediate metastable states formed in the RTE process. In all cases, measured cross sections are in good agreement with calculations based on theoretical cross sections for dielectronic recombination (DR). Since RTE closely approximates DR, the results indicate that dielectronic-recombination cross sections involving K-shell excitation can be accurately predicted for highly charged iron ions. The results for Fe25+ show that metastable states are sufficiently short lived to be observable in the RTE (or DR) process for these hydrogenlike ions. C1 WESTERN MICHIGAN UNIV, DEPT PHYS, KALAMAZOO, MI 49008 USA. AUBURN UNIV, DEPT PHYS, AUBURN, AL 36849 USA. QUEENS UNIV BELFAST, DEPT PURE & APPL PHYS, BELFAST BT7 1NN, ANTRIM, NORTH IRELAND. WESLEYAN UNIV, DEPT PHYS, MIDDLETOWN, CT 06457 USA. KALAMAZOO COLL, DEPT PHYS, KALAMAZOO, MI 49007 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. KANSAS STATE UNIV AGR & APPL SCI, DEPT PHYS, MANHATTAN, KS 66506 USA. OI Graham, William/0000-0003-2759-4657 NR 29 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 7846 EP 7850 DI 10.1103/PhysRevA.45.7846 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700027 ER PT J AU SHIMAKURA, N KOIZUMI, S SUZUKI, S KIMURA, M AF SHIMAKURA, N KOIZUMI, S SUZUKI, S KIMURA, M TI MOLECULAR TREATMENT OF ELECTRON-CAPTURE IN ATOMIC-COLLISIONS IN THE MEV-ENERGY TO KEV-ENERGY REGIME - COLLISIONS OF C5+ IONS WITH H-ATOMS AND THE EFFECT OF CORE ELECTRONS SO PHYSICAL REVIEW A LA English DT Article ID CHARGE-TRANSFER; HYDROGEN AB Electron-capture processes in collisions of C5+ ions with H atoms are investigated theoretically by using quantum-mechanical and semiclassical molecular-orbital methods in the collision-energy range from meV/amu to keV/amu. Atomic-type electron-translation factors are appropriately incorporated to ensure correct scattering boundary conditions. Total capture cross sections have a broad minimum at 0.4 keV/amu that is caused by the change of major contributors. The dominant capture channels in the triplet manifold are C4+(1s4s) below 0.1 keV/amu and C4+(1s4p), C4+(1s4d), and C4+(1s3p) above that energy. In the singlet manifold, below 0.5 keV/amu, the dominant channel is C4+(1s4s), as in the triplet manifold. However, above that energy the C4+(1S4f), C4+(1s4d), C4+(1s3p), and C4+(1s3d) channels become important. The present results for the total capture cross section is in excellent accord with the measurements by Phaneuf et al. [Phys. Rev. A 26, 1892 (1982)] and Crandall, Phaneuf, and Meyer [Phys. Rev. A 19, 504 (1979)] over the entire energy region studied. The effect of core electrons on the capture process is examined by using data from the present (C5+ + H) system and the previously studied (N5+ + H) and (B5+ + H) systems, and some remarks on the role of core electrons are made on the basis of an argument concerning the overlap of electronic charge distribution. C1 NIIGATA UNIV,FAC SCI,DEPT CHEM,NIIGATA 95021,JAPAN. ARGONNE NATL LAB,ARGONNE,IL 60439. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP SHIMAKURA, N (reprint author), NIIGATA UNIV,DEPT GEN EDUC,NIIGATA 95021,JAPAN. NR 13 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 7876 EP 7882 DI 10.1103/PhysRevA.45.7876 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700031 ER PT J AU MORIBAYASHI, K HINO, K MATSUZAWA, M KIMURA, M AF MORIBAYASHI, K HINO, K MATSUZAWA, M KIMURA, M TI HYPERSPHERICAL APPROACH TO DOUBLE-ELECTRON EXCITATION OF HE BY FAST-ION IMPACT .2. EXCITATION TO THE (2L3L') AND (3L3L') MANIFOLDS BY PROTON AND ANTIPROTON IMPACT SO PHYSICAL REVIEW A LA English DT Article ID EXCITED-STATES; DOUBLE IONIZATION; 2-ELECTRON ATOMS; HELIUM; CLASSIFICATION; COLLISION; SINGLE AB Double-electron excitation processes of He atoms from the ground state to the manifolds of the doubly excited 2l3l' and 3l3l' states by proton and antiproton impact have been theoretically investigated using a close-coupling method at the 1.5-MeV/u energy regime. The seraiclassical impact-parameter method with a straight-line-trajectory approximation is employed to describe Collision processes. Hyperspherical wave functions are adopted to take full account of strongly correlated motion of two atomic electrons in He. The difference between the cross section by proton impact and that by antiproton impact is small except for the process to the 3p3p S-1(e) state. The reason for the small difference between sigma(p) and sigma(pBAR) is discussed. The P-1(o) states are found to play an important role as intermediate ones. For the process to the doubly excited 2l3l' states, the (2s3p + 3s2p)1 P(o) state plays a crucial role. For the excitation process to the 3l3l' states, the ratio of the second-order process to the first-order one is larger than that in the case of the process to the 2l2l' and 2l3l' states, suggesting that the difference between the mechanism of the excitation to the (2l,2l') and (2l,3l') manifolds and that to the (3l,3l') manifold arises from the smaller overlap of the (3l,3l') wave functions with that of the ground state. It is seen that the physical interpretation of the results based on the rovibrator model of the doubly excited states gives a deeper physical insight into the mechanism of the double-electron excitation. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP MORIBAYASHI, K (reprint author), UNIV ELECTROCOMMUN,DEPT APPL PHYS & CHEM,1-5-1 CHOFUGAOKA,CHOFU,TOKYO 182,JAPAN. NR 19 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 7922 EP 7928 DI 10.1103/PhysRevA.45.7922 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700036 ER PT J AU SCHAFER, KJ KULANDER, KC AF SCHAFER, KJ KULANDER, KC TI PHASE-DEPENDENT EFFECTS IN MULTIPHOTON IONIZATION INDUCED BY A LASER FIELD AND ITS 2ND HARMONIC SO PHYSICAL REVIEW A LA English DT Article ID ABOVE-THRESHOLD IONIZATION; PHOTODETACHMENT; STATES; XENON; LIMIT AB We present calculations of ionization rates, anplar distributions, and above-threshold-ionization spectra for a hydrogen atom in a strong, two-color laser field. The two lasers are first- and second-harmonic fields with the same intensity and a constant relative phase difference between them. At longer wavelengths (1064 nm) and higher intensities ( > 10(13) W/cm2), there is clear evidence in the phase dependence of the ionization rates that ionization takes place primarily through tunneling. Even though the total ionization rate in this regime depends only on the peak value of the time-dependent electric field, the angular distributions show additional phase-sensitive effects. In particular, there is a large forward-backward asymmetry in the emitted electron distributions that is not simply coffelated with the maximum electric field. At shorter wavelengths and/or lower intensities, there is a transition to multiphoton ionization with interference between ionization paths from the two lasers evident in the total ionization rates. In all cases, we find that the total ponderomotive shift of the ionization limit is the sum of the shifts for the two individual fields. RP SCHAFER, KJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 17 TC 160 Z9 161 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 8026 EP 8033 DI 10.1103/PhysRevA.45.8026 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700050 ER PT J AU LUCHT, RP TREBINO, R RAHN, LA AF LUCHT, RP TREBINO, R RAHN, LA TI RESONANT MULTIWAVE-MIXING SPECTRA OF GAS-PHASE SODIUM - NONPERTURBATIVE CALCULATIONS SO PHYSICAL REVIEW A LA English DT Article ID MULTIPLE-HARMONIC CONVERSION; STRONG-FIELD THEORY; RARE-GASES; 1064-NM RADIATION; ATOMIC POTASSIUM; SPECTROSCOPY; OH; SATURATION; FLAME; CARS AB We perform nonperturbative calculations of resonant multiwave mixing of two high-intensity laser beams of different frequencies both for a general three-level system and for the 3 2S1/2-3 2P1/2 electronic resonance of the sodium atom. Our calculations proceed by direct numerical integration of the density-matrix equations and subsequent Fourier analysis of the calculated time-dependent density-matrix elements. We examine the case where two nearly degenerate input beams are each detuned many collisional linewidths from electronic resonance, and the frequency difference between the input beams is tuned through a ground-state resonance. Unlike previous high-intensity analyses, each input beam can be resonant with numerous transitions simultaneously; for a three-level system, we refer to this as an "M-type" system, in analogy with LAMBDA- and V-type systems. Calculated four-, six-, and eight-wave-mixing spectra exhibit subharmonic resonances of the type observed experimentally by Trebino and Rahn [Opt. Lett. 12, 912 (1987)]. The three-level system is studied to gain insight into the physics of these subharmonic resonances. For more quantitative comparison with experiment, we use a model that includes the 16 Zeeman and hyperfine states in the 3 2S1/2 and the 3 2P1/2 levels, and accounts for arbitrary linear polarization of the input laser radiation. The relative intensities of the resonance features in the calculated multiwave-mixing spectra show good agreement with experiment. These resonance features broaden and shift as laser intensity increases, as predicted for four-wave-mixing processes in previous, less general high-intensity analyses. Both theory and experiment also show additional resonant features in the ght-wave-mixing spectra that appear at very high intensity. RP LUCHT, RP (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. OI Rahn, Larry/0000-0002-4793-1158 NR 46 TC 22 Z9 22 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 8209 EP 8227 DI 10.1103/PhysRevA.45.8209 PG 19 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700069 ER PT J AU WANG, CZ CHAN, CT HO, KM AF WANG, CZ CHAN, CT HO, KM TI TIGHT-BINDING MOLECULAR-DYNAMICS STUDY OF LIQUID SI SO PHYSICAL REVIEW B LA English DT Article ID STRUCTURAL-PROPERTIES; ELECTRONIC-PROPERTIES; SILICON; GE; POTENTIALS; SURFACES; PHASES; ENERGY AB We have carried out molecular-dynamics simulation of liquid Si using the tight-binding Hamiltonian proposed by Goodwin, Skinner and Pettifor. The simulation results on the structural and dynamical properties (radial and angular distribution functions, the electronic density-of-states, and the diffusion constant) are presented and compared with results from classical-potential simulation and ab initio molecular dynamics (Car-Parrinello method). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,MICROELECTR RES CTR,AMES,IA 50011. RP WANG, CZ (reprint author), AMES LAB,AMES,IA 50011, USA. NR 33 TC 72 Z9 74 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 JUN 1 PY 1992 VL 45 IS 21 BP 12227 EP 12232 DI 10.1103/PhysRevB.45.12227 PG 6 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800007 ER PT J AU RUNGE, KJ AF RUNGE, KJ TI FINITE-SIZE STUDY OF THE GROUND-STATE ENERGY, SUSCEPTIBILITY, AND SPIN-WAVE VELOCITY FOR THE HEISENBERG-ANTIFERROMAGNET SO PHYSICAL REVIEW B LA English DT Article ID FUNCTION MONTE-CARLO; QUANTUM ANTIFERROMAGNETS; LOW-TEMPERATURE; SQUARE-LATTICE; SIGMA-MODEL; 2 DIMENSIONS; LA2CUO4; FERROMAGNETS; CHAINS; DYNAMICS AB The Green's-function Monte Carlo (GFMC) method is used to calculate very accurate ground-state energies of the two-dimensional, spin-1/2 Heisenberg antiferromagnet. The computations are performed on L x L square lattices up to L = 16 with varying uniform magnetization, which allows the extraction of the perpendicular susceptibility (chi) and spin-wave velocity (c). These two quantities are the lattice- or cutoff-dependent parameters that allow one to map the long-wavelength properties of the antiferromagnet onto the nonlinear sigma model and so are of general interest. Systematic errors present in previous GFMC calculations are addressed and corrected to yield results in excellent agreement with other numerical methods. I find, for the ground-state energy per site, -0.669 34(3); the susceptibility renormalization factor, Z(chi) = 0.535(5); and the spin-wave velocity renormalization factor, Z(c) = 1.10(3). Finite-size effects in the extraction of Z(c) and Z(chi) are discussed. The value of Z(chi) computed here is in agreement with the series-expansion results of Singh and of Zheng, Oitmaa, and Hamer, thereby clearing up a previous inconsistency between the series-expansion and quantum Monte Carlo predictions. RP RUNGE, KJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 39 TC 79 Z9 79 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 21 BP 12292 EP 12296 DI 10.1103/PhysRevB.45.12292 PG 5 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800014 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI EFFECT OF IMPURITIES ON THE MAGNETIC-ORDERING IN CHROMIUM SO PHYSICAL REVIEW B LA English DT Article AB It is well known that impurities profoundly alter the magnetic properties of chromium. For example, doping with as little as 0.2% vanadium changes the phase transition from weakly first order in pure chromium to second order. While vanadium impurities suppress the Neel temperature T(N), doping with manganese dramatically enhances T(N). Impurities also change the wave vector of the spin-density wave, which has the order parameter g. According to the theory of Young and Sokoloff (YS), the first-order transition in pure chromium is caused by a charge-density wave with order parameter delta proportional-to g2. Scattering by impurities suppresses the charge-density wave and drives the transition to second order. In this paper we refine the YS formalism by examining the subtle balance between the spin-density and charge-density terms in the free energy. We find that the first-order transition is destroyed when the concentration of vanadium exceeds about 0.15%, in agreement with experimental measurements. We also study the effect of impurities on the band structure and Neel temperature. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FISHMAN, RS (reprint author), N DAKOTA STATE UNIV,DEPT PHYS,SU STN BOX 5566,FARGO,ND 58105, USA. RI Fishman, Randy/C-8639-2013 NR 13 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 21 BP 12306 EP 12318 DI 10.1103/PhysRevB.45.12306 PG 13 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800016 ER PT J AU ENGELBRECHT, JR RANDERIA, M AF ENGELBRECHT, JR RANDERIA, M TI LOW-DENSITY REPULSIVE FERMI GAS IN 2 DIMENSIONS - BOUND-PAIR EXCITATIONS AND FERMI-LIQUID BEHAVIOR SO PHYSICAL REVIEW B LA English DT Article ID BOSE CONDENSATION; HUBBARD-MODEL; SUPERCONDUCTIVITY; STATE; SCATTERING; SYSTEM AB We study the dilute-gas expansion for a two-dimensional Fermi system with arbitrary short-range repulsive interactions. In contrast with the three-dimensional case, we find an unusual pole in the vertex part in the particle-particle channel, for all center-of-mass momenta q < 2k(F). We show that this represents an excitation consisting of bound hole pairs, which disperses down to zero energy at q = 2k(F). We study the effect of these bound states on the single-particle self-energy and find that the quasiparticles are well defined. Thus in the low-density regime, there is no breakdown of Fermi-liquid theory. In the Appendix we discuss the two-particle phase shift in the dilute Fermi gas, its connection with bound states, and the analogy with the potential scattering phase shift. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ENGELBRECHT, JR (reprint author), UNIV ILLINOIS,DEPT PHYS,1110 W GREEN ST,URBANA,IL 61801, USA. NR 33 TC 62 Z9 62 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 JUN 1 PY 1992 VL 45 IS 21 BP 12419 EP 12434 DI 10.1103/PhysRevB.45.12419 PG 16 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800028 ER PT J AU GRONBECHJENSEN, N HATTEL, SA SAMUELSEN, MR AF GRONBECHJENSEN, N HATTEL, SA SAMUELSEN, MR TI MICROSCOPIC TUNNELING THEORY OF LONG JOSEPHSON-JUNCTIONS SO PHYSICAL REVIEW B LA English DT Article AB We present a numerical scheme for solving a nonlinear partial integro-differential equation with nonlocal time dependence. The equation describes the dynamics in a long Josephson junction modeled by use of the microscopic theory for tunneling between superconductors. We demonstrate that the detailed behavior of a solitonic mode (fluxon dynamics) in the junction is different from the results of the conventional perturbed sine-Gordon model. C1 TECH UNIV DENMARK,PHYS LAB 1,DK-2800 LYNGBY,DENMARK. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,ADV COMP LAB,LOS ALAMOS,NM 87545. NR 16 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 21 BP 12457 EP 12464 DI 10.1103/PhysRevB.45.12457 PG 8 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800031 ER PT J AU OSSANDON, JG THOMPSON, JR CHRISTEN, DK SALES, BC KERCHNER, HR THOMSON, JO SUN, YR LAY, KW TKACZYK, JE AF OSSANDON, JG THOMPSON, JR CHRISTEN, DK SALES, BC KERCHNER, HR THOMSON, JO SUN, YR LAY, KW TKACZYK, JE TI INFLUENCE OF OXYGEN DEFICIENCY ON THE SUPERCONDUCTIVE PROPERTIES OF GRAIN-ALIGNED YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC PENETRATION DEPTH; TEMPERATURE; CURRENTS; CRYSTALS; FIELD AB Magnetically aligned samples of sintered YBa2Cu3O7-delta were used to test the effects of oxygen-deficiency delta (with delta less-than-or-equal-to 0.2) on the superconductive magnetization M, critical current density J(c), irreversibility field B(irr), upper critical field H(c2), coherence length xi, condensation energy F(c), penetration depth lambda, and related properties as a function of temperature T and applied field H parallel-to c. In selected cases, studies were also made with H parallel-to ab. The O content was monitored in situ by thermogravimetric analysis. The open porosity and granularity of the material allowed rapid and homogeneous oxygenation. We found no significant enhancement of intragrain J(c) with chain-site O defects. With few exceptions, maximum J(c) occurred at full oxygenation. This implies that chain-site O defects are not strong or effective pinning centers over most of the field-temperature regime investigated. Except for T(c), which was practically independent of delta within the interval 0 less-than-or-equal-to delta less-than-or-equal-to 0.11 (so called "90-K T(c) plateau"), most properties such as J(c), F(c), H(c2), B(irr) (T), lambda, and xi were strongly and continuously influenced by the O deficiency. The observed abnormal magnetization with H parallel-to c was weak at low T but became more pronounced as T and delta increased. No abnormal magnetization was detected with H parallel-to ab. As oxygen was removed, B(irr)(T) and H(c2)(T) separated, and both lines shifted to lower T and lower B. Moreover, B(irr) was strongly correlated with J(c) at low temperature. Determination of the thermodynamic critical field H(c) yielded condensation energies F(c)(delta) that were well correlated with J(c)(delta). The results indicate that O defects weaken the energy barrier of the existing pinning sites and have a negative overall effect on the capacity of YBa2Cu3O7-delta to carry loss-free currents. C1 UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. GE, CORP RES & DEV, SCHENECTADY, NY 12301 USA. RI Christen, David/A-9709-2008 NR 41 TC 123 Z9 123 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 21 BP 12534 EP 12547 DI 10.1103/PhysRevB.45.12534 PG 14 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800043 ER PT J AU MATSUDA, M ENDOH, Y YAMADA, K KOJIMA, H TANAKA, I BIRGENEAU, RJ KASTNER, MA SHIRANE, G AF MATSUDA, M ENDOH, Y YAMADA, K KOJIMA, H TANAKA, I BIRGENEAU, RJ KASTNER, MA SHIRANE, G TI MAGNETIC ORDER, SPIN CORRELATIONS, AND SUPERCONDUCTIVITY IN SINGLE-CRYSTAL ND1.85CE0.15CUO4+DELTA SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-SUPERCONDUCTORS; OXYGEN; ANTIFERROMAGNET; ND2-XCEXCUO4; LA2CUO4; SYSTEM; FIELD AB Measurements are reported of the static, instantaneous, and dynamic spin correlations in single crystals of Nd1.85Ce0.15CuO4+delta. The as-grown crystals show antiferromagnetic long-range order. However, the Neel temperatures and spin-stiffness constants are greatly reduced from their respective values in Nd2CuO4+delta. After reduction and annealing, the crystals superconduct with T(c) = 23 K, but inclusions of the antiferromagnetic phase, albeit with reduced Neel temperatures, are always present. Based on these data, we suggest that the disorder due to excess oxygen in as-grown samples stabilizes the magnetic correlations. This leads to a speculative model for the effects of deoxygenation in which the removal of the excess oxygen causes the magnetic correlations to diminish and hence superconductivity to become possible. C1 YAMANASHI UNIV,FAC ENGN,INORGAN SYNTH FACIL,KOFU 200,JAPAN. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP MATSUDA, M (reprint author), TOHOKU UNIV,DEPT PHYS,ARAMAKI AOBA,SENDAI,MIYAGI 980,JAPAN. RI Yamada, Kazuyoshi/C-2728-2009; Tanaka, Isao/D-1519-2012; Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 28 TC 78 Z9 78 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 21 BP 12548 EP 12555 DI 10.1103/PhysRevB.45.12548 PG 8 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800044 ER PT J AU ERIKSSON, O SODERLIND, P WILLS, JM AF ERIKSSON, O SODERLIND, P WILLS, JM TI FCC-]BCT PHASE-TRANSITION IN TH AT EXTREME COMPRESSIONS - THEORY SO PHYSICAL REVIEW B LA English DT Note ID CRYSTAL-STRUCTURE; BRILLOUIN-ZONE; SPECIAL POINTS; SYSTEMS; BAND AB The experimentally observed fcc --> bct crystallographic phase transition in Th, at approximately 1 Mbar, is reproduced by means of full-potential, linear-muffin-tin-orbitals calculations. Both the calculated volume and pressure for which the transition occurs, agrees with the experimental data. The calculated pressure dependence of the c/a ratio of the bct structure is also in good agreement with experimental data. Calculations for La predict the fcc phase to be stable over the bct phase up to approximately 7 Mbar. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV UPPSALA,DEPT PHYS,CONDENSED MATTER THEORY GRP,S-75105 UPPSALA,SWEDEN. RP ERIKSSON, O (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 13 TC 35 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 JUN 1 PY 1992 VL 45 IS 21 BP 12588 EP 12591 DI 10.1103/PhysRevB.45.12588 PG 4 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800052 ER PT J AU GONZALEZ, R PAREJA, R AF GONZALEZ, R PAREJA, R TI PROTONS IN NEUTRON-IRRADIATED AND THERMOCHEMICALLY REDUCED MGO CRYSTALS DOPED WITH LITHIUM IMPURITIES SO PHYSICAL REVIEW B LA English DT Article ID SINGLE-CRYSTALS; HYDROGEN; DIFFUSION; DEUTERIUM; OXIDE AB H- (hydride) ions have been observed in lithium-doped MgO crystals which have been neutron irradiated or thermochemically reduced (TCR). Infrared-absorption measurements have been used to identify the local modes of the H- ions in these crystals. The concentration of the H- ions in the neutron-irradiated crystals is found to be far less than that found in the TCR crystals. The thermal stability of H- and oxygen vacancies in both oxidizing and reducing atmospheres are investigated. The emergence of sharp structures due to OH- ions is attributed to the displacements of substitutional Li+ ions, leaving behind unperturbed OH- ions, via a mechanism of rapid radiation-induced diffusion during irradiation in a reactor. Results of neutron-irradiated MgO:Li, which had previously been oxidized at high temperature, are also presented. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP GONZALEZ, R (reprint author), UNIV CARLOS III,ESCUELA POLITECN SUPER,E-28913 LEGANES,SPAIN. NR 24 TC 14 Z9 14 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 22 BP 12730 EP 12735 DI 10.1103/PhysRevB.45.12730 PG 6 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200010 ER PT J AU CORKILL, JL LIU, AY COHEN, ML AF CORKILL, JL LIU, AY COHEN, ML TI COMPARISON OF CARBON AND BORON-NITRIDE IN A HYPOTHETICAL ALL-SP2-BONDED TETRAGONAL PHASE SO PHYSICAL REVIEW B LA English DT Article ID HIGH-PRESSURES; DIAMOND; SOLIDS AB We have examined BN in an all-sp2 phase similar to that previously suggested for carbon. Although calculations predict that carbon in this structure, called bct-4, will be metallic, the band overlap in bct-4 BN is predicted to be very small or zero. Hence it is suggested that the BN structure is more likely to be stable than the carbon. The antisymmetric potential in the BN structure also causes a gap in the density of states between the second and third occupied bands. As in the carbon case, the lattice match between bct-4 and the zinc-blende (100) surface for BN is nearly perfect. Thus, epitaxial growth of the bct-4 BN phase may be possible. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CORKILL, JL (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Liu, Amy/E-2266-2015 OI Liu, Amy/0000-0002-2011-1854 NR 20 TC 16 Z9 16 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 JUN 1 PY 1992 VL 45 IS 22 BP 12746 EP 12751 DI 10.1103/PhysRevB.45.12746 PG 6 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200012 ER PT J AU GROSS, J FRICKE, J PEKALA, RW HRUBESH, LW AF GROSS, J FRICKE, J PEKALA, RW HRUBESH, LW TI ELASTIC NONLINEARITY OF AEROGELS SO PHYSICAL REVIEW B LA English DT Article ID SILICA AEROGELS AB We have investigated the sound propagation in SiO2 aerogels and three types of organic aerogels: resorcinol formaldehyde, melamine formaldehyde, and vitreous carbon. The main parameter determining the sound velocity is the aerogel density; however, the bond strength and cross linking also influence the stiffness of these materials. Furthermore, we show that at least two types of low-density aerogels become less stiff and consequently the sound velocity is lowered when the specimens are uniaxially compressed. We explain this in terms of a model for the internal structure. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP GROSS, J (reprint author), UNIV WURZBURG,INST PHYS,AM HUBLAND,W-8700 WURZBURG,GERMANY. NR 16 TC 36 Z9 37 U1 8 U2 26 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 JUN 1 PY 1992 VL 45 IS 22 BP 12774 EP 12777 DI 10.1103/PhysRevB.45.12774 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200016 ER PT J AU MIN, BJ HO, KM AF MIN, BJ HO, KM TI HYDROGEN IN YTTRIUM VIA 1ST-PRINCIPLES TOTAL-ENERGY CALCULATIONS SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE PROPERTIES; SOLID-SOLUTION PHASE; ELECTRONIC-STRUCTURE; LIGHT INTERSTITIALS; NEUTRON-SCATTERING; ALPHA-LUDX; DIFFUSION; METALS; DEUTERIUM; SYSTEM AB The potential-energy surface of hydrogen in alpha-YHx is obtained from first-principles total-energy calculations for the case of YH0.5. Results on the localized vibration frequencies of hydrogen, the splitting of the hydrogen energy level, and the activation energy for hydrogen diffusion are presented and compared with available experimental data. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP MIN, BJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 41 TC 8 Z9 8 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 JUN 1 PY 1992 VL 45 IS 22 BP 12806 EP 12811 DI 10.1103/PhysRevB.45.12806 PG 6 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200021 ER PT J AU SODERLIND, P ERIKSSON, O JOHANSSON, B ALBERS, RC BORING, AM AF SODERLIND, P ERIKSSON, O JOHANSSON, B ALBERS, RC BORING, AM TI SPIN AND ORBITAL MAGNETISM IN FE-CO AND CO-NI ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID POLARIZED ELECTRONIC-STRUCTURE; SCATTERING-THEORY; HYPERFINE FIELDS; SYSTEMS; PU AB Using the linear muffin-tin orbital method and the virtual-crystal approximation, we have calculated from first principles the spin and orbital moments of Fe-Co and Co-Ni alloys. The spin-orbit interaction was included at the variational step. The calculations also incorporated orbital polarization, which improved the agreement with the experimental orbital moments. While the spin moments were fairly insensitive to the level of approximation and followed the Slater-Pauling curve, the orbital moments exhibited a more complex behavior, where, for example, the crystal structure plays a most decisive role. Finally, enhanced orbital moments are predicted for Co1-xNix alloys with x approximately 0.25-0.5 in a hypothetical bcc structure, and for Fe1-xCox alloys with x approximately 0.25 in a hypothetical fcc structure. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SODERLIND, P (reprint author), UNIV UPPSALA,DEPT PHYS,S-75105 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 26 TC 117 Z9 118 U1 0 U2 14 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 JUN 1 PY 1992 VL 45 IS 22 BP 12911 EP 12916 DI 10.1103/PhysRevB.45.12911 PG 6 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200035 ER PT J AU MCCORMACK, R DEFONTAINE, D CEDER, G AF MCCORMACK, R DEFONTAINE, D CEDER, G TI OXYGEN CONFIGURATIONS AND THEIR EFFECT ON CHARGE-TRANSFER IN OFF-STOICHIOMETRIC YBA2CU3OZ SO PHYSICAL REVIEW B LA English DT Article ID PHASE-DIAGRAM; OXIDE SUPERCONDUCTORS; STRUCTURAL ANOMALIES; CRITICAL-TEMPERATURE; HOLE CONCENTRATION; RANGE ORDER; TC; TRANSITION; BEHAVIOR; VACANCIES AB The relationship between oxygen structure, charge transfer (hole count), and oxygen content in the YBa2Cu3Oz superconductor is studied by combining Monte Carlo simulation with existing electronic-structure calculations. The present model proposes an expansion of the hole count in terms of oxygen configuration variables for states of an arbitrary degree of order. Configurations are obtained by Monte Carlo simulation on a two-dimensional asymmetric next-nearest-neighbor Ising model. Calculations of hole count as a function of oxygen content suggest that oxygen ordering is, at least in part, responsible for the observed plateau structure of T(c) versus the oxygen content z. The fact that, in the present model, the hole count does not exhibit two well-defined plateaus indicates that the value of T(c) is not simply related to the amount of charge transfer. Previous models, which claim to predict the 90- and 60-K plateaus on the basis of either electronic-structure or oxygen order considerations, are shown to agree with experimental findings for (partially) fortuitous reasons. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. MIT,DEPT MAT SCI,CAMBRIDGE,MA 02139. RP MCCORMACK, R (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 48 TC 58 Z9 58 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 JUN 1 PY 1992 VL 45 IS 22 BP 12976 EP 12987 DI 10.1103/PhysRevB.45.12976 PG 12 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200044 ER PT J AU KENDZIORA, C FORRO, L MANDRUS, D HARTGE, J STEPHENS, P MIHALY, L REEDER, R MOECHER, D RIVERS, M SUTTON, S AF KENDZIORA, C FORRO, L MANDRUS, D HARTGE, J STEPHENS, P MIHALY, L REEDER, R MOECHER, D RIVERS, M SUTTON, S TI COMPOSITION, STRUCTURE, AND ELECTRICAL-PROPERTIES OF BI2SR2CA1-YYYCU2O8 - A SINGLE-CRYSTAL STUDY SO PHYSICAL REVIEW B LA English DT Article ID METAL-INSULATOR-TRANSITION; MAGNETIC-PROPERTIES; HOLE CONCENTRATION; TC; BI2SR2CACU2O8+DELTA; SUPERCONDUCTORS; DIFFRACTION; CA AB A systematic study of yttrium substitution for calcium in the high-temperature superconductor Bi2Sr2CaCu2O8 has been performed. Single crystals were grown, cleaved, and characterized with use of x-ray fluorescence, electron microprobe, and electron- and x-ray-diffraction techniques. The dc resistivity, diamagnetic shielding, and Hall coefficient of the samples were also measured as functions of the temperature from 4 to 300 K for different dopant concentrations. We conclude that our systematic substitution in the family Bi2Sr2Ca1-yYyCu2O8 gives an insight into this high-temperature superconducting material as well as into weak localization and metal-insulator transitions. C1 SUNY STONY BROOK,INST MINERAL PHYS,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP KENDZIORA, C (reprint author), SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794, USA. RI Mandrus, David/H-3090-2014 NR 30 TC 79 Z9 79 U1 2 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 22 BP 13025 EP 13034 DI 10.1103/PhysRevB.45.13025 PG 10 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200050 ER PT J AU WOLVERTON, C CEDER, G DEFONTAINE, D DREYSSE, H AF WOLVERTON, C CEDER, G DEFONTAINE, D DREYSSE, H TI ABINITIO GROUND-STATE STUDY WITH 4TH-NEAREST-NEIGHBOR CLUSTER INTERACTIONS FOR FCC PD-V ALLOYS SO PHYSICAL REVIEW B LA English DT Note ID 1ST-PRINCIPLES; SYSTEMS AB A cluster expansion is used to predict the fcc ground states, i.e., the stable superstructures at zero kelvin as a function of composition, in a binary alloy system. The intermetallic fcc superstructures are not assumed, but derived rigorously by minimizing the configurational energy subject to linear constraints. This ground-state search includes pair and multiplet interactions which spatially extend to fourth-nearest neighbor. A large number of these concentration-independent interactions are computed for the Pd-V system by the method of direct configurational averaging using a linearized-muffin-tin-orbital Hamiltonian cast into tight-binding form. With these interactions, derived without the use of any adjustable or experimentally derived parameters, it is possible to make an exact ground-state search on the fcc lattice. Agreement with the fcc-based portion of the experimentally determined Pd-V phase diagram is excellent. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. MIT,DEPT MAT SCI,CAMBRIDGE,MA 02139. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV NANCY 1,PHYS SOLIDE LAB,F-54506 VANDOEUVRE NANCY,FRANCE. RP WOLVERTON, C (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Wolverton, Christopher/B-7542-2009 NR 20 TC 20 Z9 20 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 22 BP 13105 EP 13108 DI 10.1103/PhysRevB.45.13105 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200066 ER PT J AU BALATSKY, A ABRAHAMS, E AF BALATSKY, A ABRAHAMS, E TI NEW CLASS OF SINGLET SUPERCONDUCTORS WHICH BREAK TIME-REVERSAL AND PARITY SO PHYSICAL REVIEW B LA English DT Note AB A class of singlet superconductors with a gap function DELTA(k,omega(n)) which is odd in both momentum and Matsubara frequency is considered. Some of the physical properties of this superconductivity are discussed and it is argued that in many cases there is no gap in the quasiparticle spectrum and these superconductors will exhibit a Meissner effect. C1 RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08854. RP BALATSKY, A (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,MS K765,LOS ALAMOS,NM 87545, USA. NR 10 TC 159 Z9 159 U1 2 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 JUN 1 PY 1992 VL 45 IS 22 BP 13125 EP 13128 DI 10.1103/PhysRevB.45.13125 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200071 ER PT J AU RUNGE, KJ AF RUNGE, KJ TI NUMERICAL STUDY OF THE ONSET OF SUPERFLUIDITY IN 2-DIMENSIONAL, DISORDERED, HARD-CORE BOSONS SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTOR-INSULATOR TRANSITION; SYSTEMS; LOCALIZATION; CHAIN; MODEL AB The ground-state of hard-core bosons in a random one-body potential is studied numerically to observe the transition from superfluid to insulating "Bose glass" phase. Finite-size scaling analyses are performed to estimate the transition point and critical exponents. The dynamical critical exponent is z=1.95+/-0.25 and is consistent with the prediction of Fisher et al. [Phys. Rev. B 40, 546 (1989)]. Values for other exponents and preliminary results regarding the universal conductivity are presented. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 31 TC 57 Z9 57 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 22 BP 13136 EP 13139 DI 10.1103/PhysRevB.45.13136 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200074 ER PT J AU CROMMIE, MF BRICENO, G ZETTL, A AF CROMMIE, MF BRICENO, G ZETTL, A TI INPLANE VORTEX-LATTICE DEPINNING IN A LAYERED SUPERCONDUCTOR SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTORS; FLUX; ANISOTROPY; FIELD AB The out-of-plane (c-axis) dissipation of the layered superconductor Bi2Sr2CaCu2O8 has been probed in the mixed state by current-voltage (I-V) measurements. Distinctly different behavior is observed for magnetic field H oriented parallel (parallel-to) and perpendicular (perpendicular-to) to c, suggestive of two different out-of-plane dissipation mechanisms. We interpret our results for H perpendicular-to c as arising from Josephson vortex dynamics. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CROMMIE, MF (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 22 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 22 BP 13148 EP 13151 DI 10.1103/PhysRevB.45.13148 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200077 ER PT J AU MCNAUGHTON, MW KOCH, K SUPEK, I TANAKA, N AMBROSE, DA COFFEY, P JOHNSTON, K MCNAUGHTON, KH RILEY, PJ GLASS, G HIEBERT, JC NORTHCLIFFE, LC SIMON, AJ MERCER, DJ ADAMS, DL SPINKA, H JEPPESEN, RH TRIPARD, GE WOOLVERTON, H AF MCNAUGHTON, MW KOCH, K SUPEK, I TANAKA, N AMBROSE, DA COFFEY, P JOHNSTON, K MCNAUGHTON, KH RILEY, PJ GLASS, G HIEBERT, JC NORTHCLIFFE, LC SIMON, AJ MERCER, DJ ADAMS, DL SPINKA, H JEPPESEN, RH TRIPARD, GE WOOLVERTON, H TI H-2(P,N)2P SPIN TRANSFER FROM 305 TO 788 MEV SO PHYSICAL REVIEW C LA English DT Article ID C ANALYZING POWER; CORRELATION PARAMETER ANN; NP ELASTIC-SCATTERING; INTERMEDIATE ENERGIES; POLARIMETER; POLARIZATION; KNN; KLL AB Measurements of the spin-transfer parameter K(LL) for H-2(p, n)2p at 0-degrees to calibrate the neutron-beam polarization clarify a normalization discrepancy affecting np data at LAMPF. The new data are in good agreement with theoretical predictions. C1 UNIV TEXAS,AUSTIN,TX 78712. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV COLORADO,BOULDER,CO 80309. RICE UNIV,HOUSTON,TX 77251. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV MONTANA,MISSOULA,MT 59812. WASHINGTON STATE UNIV,PULLMAN,WA 99164. UNIV CENT ARKANSAS,CONWAY,AR 72032. RP MCNAUGHTON, MW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 42 TC 25 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2564 EP 2569 DI 10.1103/PhysRevC.45.2564 PG 6 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100009 ER PT J AU STERBENZ, SM DEHNHARD, D JONES, MK NANDA, SK PARMAN, CE YEN, YF JONES, KW MORRIS, CL AF STERBENZ, SM DEHNHARD, D JONES, MK NANDA, SK PARMAN, CE YEN, YF JONES, KW MORRIS, CL TI INELASTIC-SCATTERING OF POLARIZED PROTONS FROM HE-4 AT 500 AND 800 MEV SO PHYSICAL REVIEW C LA English DT Article ID 1ST EXCITED-STATE; INTERMEDIATE ENERGIES; ELASTIC-SCATTERING; IMPULSE APPROXIMATION; ELECTRON-SCATTERING; CHARGE-SYMMETRY; SHELL-MODEL; CONTINUUM; NUCLEI; H-3 AB Inclusive He-4(p -->,p') spectra were measured at incident energies T(p) = 500 and 800 MeV over a range of forward scattering angles between 5-degrees and 30-degrees. The first excited 0+, T=0 state at 20.1 MeV and the 2-, T=0 state at 22.1 MeV appear as distinct structures in the spectra. Angular distributions of differential cross sections sigma and analyzing powers A(y) were extracted for these states and for regions of excitation in the continuum up to 40 MeV. Distorted-wave calculations for inelastic scattering using transition densities from the recoil corrected continuum shell model (RCCSM) were compared with the data. The RCCSM generally predicts too small sigma and too large A(y). Assuming a pure giant monopole excitation for the 20.1-MeV, 0+ state, we found greater giant monopole resonance strength than has been deduced from He-4(e, e') studies. C1 UNIV MINNESOTA,MINNEAPOLIS,MN 55455. RP STERBENZ, SM (reprint author), LOS ALAMOS NATL LAB,LAMPF,LOS ALAMOS,NM 87545, USA. NR 48 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2578 EP 2588 DI 10.1103/PhysRevC.45.2578 PG 11 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100011 ER PT J AU PICKLESIMER, A RICE, RA BRANDENBURG, R AF PICKLESIMER, A RICE, RA BRANDENBURG, R TI DELTA-DEGREES OF FREEDOM IN TRINUCLEI .4. DELTA-DELTA-DELTA-EFFECTS SO PHYSICAL REVIEW C LA English DT Article ID ISOBAR AB The effect of triple-DELTA degrees of freedom on the triton binding energy (E(T)) is gauged using the Argonne V28 and Hannover-DELTA-models. The DELTA-DELTA-DELTA three-body force is found to contribute only a few keV of additional attraction to the triton binding, and is thus negligible relative to the few-hundred-keV scale set by NN-DELTA and N-DELTA-DELTA contributions. Consequently, previous results for DELTA-contributions to E(T) require no correction for omitted DELTA-DELTA-DELTA configurations, despite the fact that DELTA-effects involving fewer than threee-DELTA's largely cancel. The trinuclear DELTA-DELTA-DELTA wave function component is found to be similarly reduced from NN-DELTA and N-DELTA-DELTA levels. C1 UNIV BASEL,INST PHYS,CH-3056 BASEL,SWITZERLAND. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. RP PICKLESIMER, A (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 7 TC 20 Z9 20 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2624 EP 2627 DI 10.1103/PhysRevC.45.2624 PG 4 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100015 ER PT J AU SCHIAVILLA, R WIRINGA, RB PANDHARIPANDE, VR CARLSON, J AF SCHIAVILLA, R WIRINGA, RB PANDHARIPANDE, VR CARLSON, J TI EFFECTS OF DELTA-ISOBAR DEGREES OF FREEDOM ON LOW-ENERGY ELECTROWEAK TRANSITIONS IN FEW-BODY NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID RADIATIVE NEUTRON-CAPTURE; CROSS-SECTION; FORM-FACTORS; BETA-DECAY; HE-3; SCATTERING; THRESHOLD; DEUTERON; BREAKUP; 3-BODY AB Variational wave functions with DELTA-isobar components are used to study trinucleon magnetic moments, the Gamow-Teller matrix element of tritium beta-decay, thermal neutron radiative capture on He-3, and low-energy proton weak capture on He-3. The DELTA-isobar components are generated by transition correlation operators acting on realistic nuclear wave functions. These correlations are obtained from a fit to exact two-body ground-state and low-energy scattering solutions for the Argonne upsilon-28 and upsilon-28Q interaction models, which include DELTA-isobar degrees of freedom. Contributions of DELTA-isobars to electroweak current operators appear at the one-body level in this formalism. Their effect on low-energy electroweak transitions is significantly smaller than that obtained in perturbation theory analyses, where DELTA-isobar effects are commonly subsumed into effective two-body current operators. The resulting theoretical cross section for thermal neutron radiative capture on He-3 is almost-equal-to 86-mu-b, compared to an experimental value of 55+/-3-mu-b; the astrophysical S factor for proton weak capture on He-3 is predicted to be in the range (1.4-3.2) X 10(-23) MeV b. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. RP SCHIAVILLA, R (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Wiringa, Robert/M-4970-2015 NR 48 TC 72 Z9 72 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2628 EP 2639 DI 10.1103/PhysRevC.45.2628 PG 12 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100016 ER PT J AU MULLINS, SM JENKINS, I HE, YJ KIRWAN, AJ NOLAN, PJ HUGHES, JR WADSWORTH, R WYSS, RA AF MULLINS, SM JENKINS, I HE, YJ KIRWAN, AJ NOLAN, PJ HUGHES, JR WADSWORTH, R WYSS, RA TI 2ND MINIMUM LIFETIME MEASUREMENTS IN ND-133 AND ND-137 SO PHYSICAL REVIEW C LA English DT Article ID SUPERDEFORMED BAND; SPECTROSCOPY AB The quadrupole moments (Q0) of the highly deformed, second minimum bands in Nd-133 and Nd-137 have been extracted from mean lifetime measurements using the Doppler shift attenuation method. The reactions Pd-105(S-32,2p2n)Nd-133 at 152 MeV and Ru-104(S-36,3n)Nd-137 at 145 MeV were used. A standard centroid shift analysis was carried out in both cases, which gave values of Q0 = (6.0+/-0.7)e b and (4.0+/-0.5)e b for Nd-113 and Nd-137, respectively, corresponding to axial prolate deformations of beta-2 congruent-to 0.33 and congruent-to 0.22. A line-shape analysis was also carried out for Nd-133 to check against the possible effect of sidefeeding. The result was Q0 = (6.7 + 0.7)e b, with sightly slower sidefeeding times corresponding to Q(sf)BAR congruent-to 5.3e b. The results are in good agreement with the predictions of total Routhian surface calculations, and are discussed in the context of other highly deformed bands in the A = 130-140 mass region. C1 UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,ENGLAND. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. NR 43 TC 32 Z9 32 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2683 EP 2692 DI 10.1103/PhysRevC.45.2683 PG 10 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100020 ER PT J AU WARD, H JOHNSON, K KAHRIMANIS, G SAUNDERS, D MOORE, CF MORDECHAI, S MORRIS, CL FORTUNE, HT KAGARLIS, MA SMITH, DA ODONNELL, JM AUERBACH, N AF WARD, H JOHNSON, K KAHRIMANIS, G SAUNDERS, D MOORE, CF MORDECHAI, S MORRIS, CL FORTUNE, HT KAGARLIS, MA SMITH, DA ODONNELL, JM AUERBACH, N TI DOUBLE GIANT-DIPOLE RESONANCE IN THE (PI-, PI+) REACTION SO PHYSICAL REVIEW C LA English DT Article ID DOUBLE-CHARGE-EXCHANGE; EXCITATION AB The double isovector giant dipole state has been observed in the (pi-, pi+) DELTA-T(z) = +2 double-charge-exchange reaction on C-13, Al-27, Ca-40, Fe-56, Co-50, and Nb-93. The resonances observed in the (pi-, pi+) reaction are closely related via Coulomb displacement energy and isospin symmetry to the resonances measured in the inverse (pi+, pi-) reaction on the same nuclei. The new observations provide a direct determination of the upper isospin component of the double giant dipole state, which is generally very weak in the (pi+, pi-) reaction. The comparison between the double dipole in the two double-charge-exchange modes gives valuable information on the isospin splitting and the Pauli-blocking effects for isotensor transitions. C1 BEN GURION UNIV NEGEV,IL-84105 BEER SHEVA,ISRAEL. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV PENN,PHILADELPHIA,PA 19104. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. RP WARD, H (reprint author), UNIV TEXAS,AUSTIN,TX 78712, USA. NR 25 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2723 EP 2732 DI 10.1103/PhysRevC.45.2723 PG 10 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100024 ER PT J AU CHRISTIE, WB MUELLER, WFJ OLSON, DL SYMONS, TJM WIEMAN, HH BEAVIS, D BRADY, FP ROMERO, JL TULL, CE ABBOTT, T FUNG, SY KEANE, D LIU, Y AF CHRISTIE, WB MUELLER, WFJ OLSON, DL SYMONS, TJM WIEMAN, HH BEAVIS, D BRADY, FP ROMERO, JL TULL, CE ABBOTT, T FUNG, SY KEANE, D LIU, Y TI PION CORRELATIONS IN 1.8 A GEV AR ON KCL AND LA AND 1.2 A GEV XE ON LA SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; ENERGY NUCLEAR COLLISIONS; RELATIVISTIC NUCLEI; ABRASION-ABLATION; SOURCE PARAMETERS; INTERFEROMETRY; DISTRIBUTIONS AB Results are presented for pion interferometry measurements of 1.8 A GeV Ar + KCl and Ar + La, and 1.2 A GeV Xe + La at the Lawrence Berkeley Laboratory Heavy Ion Spectrometer System. The parameters R, tau, lambda, R perpendicular-to, and R parallel-to are presented for all three projectile-target combinations. The correlation between the extracted size of the pion source and the centrality of the collision is investigated as well as the freeze-out densities and the dependence of the source size on the mean momentum of the pion pairs. The experimental setup and analysis are discussed and comparisons made with the results of others. The phase space covered is at forward angles in the center-of-mass system. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. BROOKHAVEN NATL LAB,UPTON,NY 11973. KENT STATE UNIV,KENT,OH 44242. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. HARBIN INST TECHNOL,HARBIN,PEOPLES R CHINA. RP CHRISTIE, WB (reprint author), UNIV CALIF DAVIS,DAVIS,CA 95616, USA. NR 38 TC 3 Z9 3 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2836 EP 2853 DI 10.1103/PhysRevC.45.2836 PG 18 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100036 ER PT J AU PACHECO, AJ NIELLO, JOF DIGREGORIO, DE DITADA, M TESTONI, JE CHAN, Y CHAVEZ, E GAZES, S PLAGNOL, E STOKSTAD, RG AF PACHECO, AJ NIELLO, JOF DIGREGORIO, DE DITADA, M TESTONI, JE CHAN, Y CHAVEZ, E GAZES, S PLAGNOL, E STOKSTAD, RG TI CAPTURE REACTIONS IN THE CA-40, CA-48+AU-197 AND CA-40, CA-48+PB-208 SYSTEMS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION REACTIONS; FUSION CROSS-SECTIONS; SUB-BARRIER ENERGIES; DYNAMICS; FISSION; NUCLEUS AB Capture-fission cross sections for Ca-40, Ca-48 + Au-197 and Ca-40, Ca-48 + Pb-208 have been measured at beam energies ranging from 195 to 416 MeV. The fissionlike fragments were detected in a pair of position-sensitive multiwire proportional counters and were identified from measurements of position and time using two-body kinematics. The data taken at energies above the barrier (up to 2.4 times the Coulomb barrier) were analyzed in terms of the extra push model showing a strong dependence on the Ca isotope. This dependence was also observed at energies below the barrier, where the results have been interpreted using a schematic coupled-channel code. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP PACHECO, AJ (reprint author), COMIS NACL ENERGIA ATOM,DEPT FIS,TANDAR,AVE LIBERTADOR 8250,RA-1429 BUENOS AIRES,DF,ARGENTINA. NR 20 TC 32 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2861 EP 2869 DI 10.1103/PhysRevC.45.2861 PG 9 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100038 ER PT J AU ABBOTT, T AKIBA, Y ALBURGER, D BEAVIS, D BIRSTEIN, L BLOOMER, MA BOND, PD CHASMAN, C CHEN, Z CHU, YY COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R DUEK, E ENGELAGE, J FUNG, SY GRODZINS, L 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 SHOR, A STANKUS, P STEADMAN, SG STEPHANS, GSF SUGITATE, T TANAKA, M TANNENBAUM, MJ TORIKOSHI, M VANDIJK, JH VIDEBAEK, F VIENT, M VINCENT, P VULGARIS, E VUTSADAKIS, V WATSON, WA WEGNER, HE WOODRUFF, DS WU, YD ZAJC, W AF ABBOTT, T AKIBA, Y ALBURGER, D BEAVIS, D BIRSTEIN, L BLOOMER, MA BOND, PD CHASMAN, C CHEN, Z CHU, YY COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R DUEK, E ENGELAGE, J FUNG, SY GRODZINS, L 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 SHOR, A STANKUS, P STEADMAN, SG STEPHANS, GSF SUGITATE, T TANAKA, M TANNENBAUM, MJ TORIKOSHI, M VANDIJK, JH VIDEBAEK, F VIENT, M VINCENT, P VULGARIS, E VUTSADAKIS, V WATSON, WA WEGNER, HE WOODRUFF, DS WU, YD ZAJC, W TI GLOBAL TRANSVERSE ENERGY-DISTRIBUTIONS IN RELATIVISTIC NUCLEAR COLLISIONS AT 14.6A GEV/C SO PHYSICAL REVIEW C LA English DT Article ID CENTRAL RAPIDITY REGION; ALPHA-ALPHA; MULTIPLICITY DISTRIBUTIONS; O-16-NUCLEUS COLLISIONS; P+A COLLISIONS; EMISSION; PARTICLE; DETECTOR; SPECTRA; O-16+PB AB A systematic set of measurements of the global transverse energy distributions, d-sigma/dE(T) and dE(T)/d-eta, from beams of protons, O-16 and Si-28 at 14.6A GeV/c, incident on targets ranging from Be to Au is presented. The detector was a semicircular array of lead-glass blocks, covering polar angles 9-degrees < theta < 32-degrees, whose total response provides a good measure of the produced particle yield in the central rapidity region of these reactions. Proton-nucleus spectra exhibit a similar shape on the high-energy tail, independent of target, suggesting that produced particles in such events arise mostly from the first collision of the projectile proton. For targets heavier than Cu, the high-energy edges of the oxygen-nucleus spectra, and of the silicon-nucleus spectra, reach ratios consistent with the geometry of central collisions. Angular distributions, dE(T)/d-eta, are characterized by Gaussian fits, and an acceptance-independent form of the differential cross section is found, based on the maximum value of dE(T)/d-eta. The projectile dependence of nucleus-nucleus spectra is studied in terms of two very different models: simple energy scaling and the wounded projectile nucleon model of p+A convolutions. C1 COLUMBIA UNIV,NEW YORK,NY 10027. KYUSHU UNIV,FUKUOKA 812,JAPAN. ARGONNE NATL LAB,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. NEVIS LABS,IRVINGTON,NY 10533. UNIV TOKYO,INST NUCL STUDY,TOKYO 188,JAPAN. MIT,CAMBRIDGE,MA 02139. HIROSHIMA UNIV,INST NUCL STUDY,HIROSHIMA 730,JAPAN. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. 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 34 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2933 EP 2951 DI 10.1103/PhysRevC.45.2933 PG 19 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100047 ER PT J AU CHAPMAN, S GYULASSY, M AF CHAPMAN, S GYULASSY, M TI NUCLEAR STOPPING POWER AT SIMILAR-TO-15 GEV NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; ENERGY DEPOSITION; MODEL; DISTRIBUTIONS; FLOW AB Fireball, firestreak, and hadronic string models are shown to overpredict recent central 15A GeV Si + Au E802 spectrometer data. Claims in the literature about full nuclear stopping in Si + Au reactions are therefore not supported by these data. In fact, fits to the spectrometer data indicate that up to half of the projectile nucleons may lose less than one unit of rapidity after traversing 5-10 fm of nuclear matter, implying an unexpected long stopping length of approximately 20 fm. On the other hand, E810, E814, and preliminary E802 dN(ch)/d-eta data are more consistent with the expected degree of stopping. RP CHAPMAN, S (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 39 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2952 EP 2962 DI 10.1103/PhysRevC.45.2952 PG 11 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100048 ER PT J AU ILIADIS, C ROSS, JG GORRES, J WIESCHER, M GRAFF, SM AZUMA, RE AF ILIADIS, C ROSS, JG GORRES, J WIESCHER, M GRAFF, SM AZUMA, RE TI REACTION AR-36(P,GAMMA)K-37 IN EXPLOSIVE HYDROGEN BURNING SO PHYSICAL REVIEW C LA English DT Article AB The reaction Ar-36(p,gamma)K-37 has been measured in the proton energy range of E(p)=0.32-0.93 MeV. A new resonance was found at E(R) = 321 keV. We have measured the branching ratios and the resonance strength. The stellar reaction rates which are dominated by this resonance for temperatures T=0.07-0.9 GK are calculated. Network calculations have been performed to investigate the influence of the new stellar rates on the time evolution of the Ar-36 abundance during explosive H burning. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. RP ILIADIS, C (reprint author), UNIV NOTRE DAME,NOTRE DAME,IN 46556, USA. NR 12 TC 12 Z9 12 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 2989 EP 2994 DI 10.1103/PhysRevC.45.2989 PG 6 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100051 ER PT J AU BIJKER, R GINOCCHIO, JN AF BIJKER, R GINOCCHIO, JN TI EIKONAL SCATTERING FROM COMPLEX-SYSTEMS SO PHYSICAL REVIEW C LA English DT Note ID INTERACTING-BOSON MODEL; COLLECTIVE NUCLEAR-STATES AB We derive a general expression for the representation matrix elements for a vibrator and a displaced harmonic oscillator in an arbitrary number of dimensions. These matrix elements arise naturally in an eikonal treatment of scattering from complex systems and contain the results derived for proton-nucleus and electron-molecule scattering as special cases. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BIJKER, R (reprint author), UNIV UTRECHT,RJ VANDEGRAAFFLABORATORY,POB 80000,3508 TD UTRECHT,NETHERLANDS. NR 18 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP 3030 EP 3033 DI 10.1103/PhysRevC.45.3030 PG 4 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100062 ER PT J AU CHOU, WT CASTEN, RF ZAMFIR, NV AF CHOU, WT CASTEN, RF ZAMFIR, NV TI SIGNATURE SPLITTING IN OCTUPOLE BANDS OF DEFORMED-NUCLEI SO PHYSICAL REVIEW C LA English DT Note ID STATES AB Energy staggering in octupole bands in deformed nuclei is studied. The data show dramatic variations, even reversals, and a singularity in the staggering, across the rare-earth region. A simple model analysis, which is almost parameter independent, is able to reproduce the phenomenology, including the discontinuity, and is amenable to a simple physical interpretation. C1 CLARK UNIV,WORCESTER,MA 01610. INST ATOM PHYS,BUCHAREST,ROMANIA. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. RP CHOU, WT (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 7 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP R2545 EP R2547 PG 3 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100004 ER PT J AU PAUL, ES WARING, MP CLARK, RM FORBES, SA FOSSAN, DB HUGHES, JR LAFOSSE, DR LIANG, Y MA, R VASKA, P WADSWORTH, R AF PAUL, ES WARING, MP CLARK, RM FORBES, SA FOSSAN, DB HUGHES, JR LAFOSSE, DR LIANG, Y MA, R VASKA, P WADSWORTH, R TI DELAYED NEUTRON ALIGNMENT IN I-117 SO PHYSICAL REVIEW C LA English DT Note ID HIGH-SPIN; ROTATIONAL BANDS; NUCLEI; REGION; DEFORMATION; SM-135 AB The rotational alignment of h11/2 neutrons is considerably delayed (DELTA-HBAR-omega approximately 0.11 MeV) in the pi-h11/2[550]1/2- intruder band in I-117 when compared to bands built on normal-parity states. Comparison with cranked shell-model calculations suggests that this effect may indicate a larger quadrupole deformation for the intruder orbital. A strong neutron-proton interaction between the aligning h11/2 neutrons and the h11/2 proton intruder may also play a role. In addition, noncollective oblate states at I(pi) = 39/2-, 43/2-, and 45/2(-) compete energetically with rotational states of the intruder band which may also perturb the neutron alignment. C1 BROOKHAVEN NATL LAB, DEPT MED, UPTON, NY 11973 USA. UNIV YORK, DEPT PHYS, YORK YO1 5DD, N YORKSHIRE, ENGLAND. SUNY STONY BROOK, DEPT PHYS, STONY BROOK, NY 11794 USA. RP UNIV LIVERPOOL, OLIVER LODGE LAB, POB 147, LIVERPOOL L69 3BX, ENGLAND. NR 27 TC 21 Z9 21 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1992 VL 45 IS 6 BP R2531 EP R2531 PG 1 WC Physics, Nuclear SC Physics GA HY691 UT WOS:A1992HY69100001 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 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 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 MEASUREMENT OF PARTICLE-PRODUCTION IN PROTON-INDUCED REACTIONS AT 14.6 GEV/C SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-ION COLLISIONS; STRANGENESS; SYSTEM AB Particle production in proton-induced reactions at 14.6 GeV/c on Be, Al, Cu, and Au targets has been systematically studied using the E-802 spectrometer at the BNL-Alternating Gradient Synchrotron. Particles are measured in the angular range from 5-degrees to 58-degrees and identified up to momenta of 5, 3.5, and 8 GeV/c for pions, kaons, and protons, respectively. Mechanisms for particle production are discussed in comparison with heavy-ion-induced reactions at the same incident energy per nucleon. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. UNIV CALIF BERKELEY, SPACE SCI LAB, BERKELEY, CA 94720 USA. UNIV CALIF RIVERSIDE, RIVERSIDE, CA 92521 USA. COLUMBIA UNIV, NEW YORK, NY 10027 USA. NEVIS LABS, IRVINGTON, NY 10533 USA. UNIV TOKYO, INST NUCL STUDY, TANASHI, TOKYO 188, JAPAN. KYUSHU UNIV, FUKUOKA 812, JAPAN. MIT, CAMBRIDGE, MA 02139 USA. UNIV TOKYO, DEPT PHYS, TOKYO 113, 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; NR 25 TC 98 Z9 98 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP 3906 EP 3920 DI 10.1103/PhysRevD.45.3906 PN 1 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900003 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LIMON, P LISS, TM LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LIMON, P LISS, TM LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI LIMIT ON THE TOP-QUARK MASS FROM PROTON-ANTIPROTON COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW D LA English DT Article ID HEAVY FLAVOR PRODUCTION; E+E ANNIHILATION; VECTOR-BOSON; HADRONIC COLLISIONS; NEUTRAL-CURRENT; STANDARD MODEL; CROSS-SECTION; SEARCH; CDF; DETECTOR AB We present results of searches for the top quark in ppBAR collisions at square-root s = 1.8 TeV. The data sample was collected during 1988-1989 at the Fermilab Tevatron Collider and has an integrated luminosity of 4.1 pb-1. We have extended our previous search for e-mu final states to include the ee and mu-mu-channels. In addition, we have searched for a low-transverse-momentum muon as a tag of the bottom quark in top decay events with a lepton and at least two jets. We obtain a lower limit on the top-quark mass of 91 GeV/c2 at the 95% confidence level assuming standard-model charged-current decays. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,NAZL FRASCATI LAB,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,NEWARK,NJ 07104. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,OHO,IBARAKI 305,JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052 NR 59 TC 79 Z9 79 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 JUN 1 PY 1992 VL 45 IS 11 BP 3921 EP 3948 DI 10.1103/PhysRevD.45.3921 PN 1 PG 28 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900004 ER PT J AU GELD, TL NEAL, H AKERLOF, C CHAPMAN, J ERREDE, D KEN, MT KESTEN, P MEYER, DI NITZ, D THUN, R TSCHIRHART, R ABACHI, S DERRICK, M KOOIJMAN, P MUSGRAVE, B PRICE, L REPOND, J SUGANO, K BLOCKUS, D BRABSON, BB BROM, JM JUNG, C OGREN, H RUST, DR SNYDER, A CORK, B BARINGER, P BYLSMA, BG DEBONTE, R LOW, EH MCILWAIN, RL MILLER, DH NG, CR RANGAN, K SHIBATA, E AF GELD, TL NEAL, H AKERLOF, C CHAPMAN, J ERREDE, D KEN, MT KESTEN, P MEYER, DI NITZ, D THUN, R TSCHIRHART, R ABACHI, S DERRICK, M KOOIJMAN, P MUSGRAVE, B PRICE, L REPOND, J SUGANO, K BLOCKUS, D BRABSON, BB BROM, JM JUNG, C OGREN, H RUST, DR SNYDER, A CORK, B BARINGER, P BYLSMA, BG DEBONTE, R LOW, EH MCILWAIN, RL MILLER, DH NG, CR RANGAN, K SHIBATA, E TI STUDY OF INCLUSIVE LAMBDA-PRODUCTION IN E+E- ANNIHILATIONS AT 29-GEV SO PHYSICAL REVIEW D LA English DT Article ID LUND MONTE-CARLO AB Cross sections are presented for the inclusive production of A hyperons in electron-positron annihilations at square-root s=29 GeV based on the full 291-pb-1 sample of data taken in the High Resolution Spectrometer experiment at the SLAC e+e- storage ring PEP. These results, and the associated correlation analyses, are consistent with the Lund model predictions with the strange diquark suppression ratio-delta fixed at 0.59+/-0.10+/-0.18, as compared to the standard Lund value of 0.32. The LAMBDA multiplicity has been found to be 0. 182+/-0.020 per event. The opposite-strangeness multiplicity [n(LAMBDA-LAMBDABAR)] has been measured to be 0.046+/-0.020, whereas the like-strangeness multiplicity [n(LAMBDA-LAMBDA+LAMBDABAR-LAMBDABAR)] is 0.009+/-0.028. A strong correlation is found between LAMBDA's and LAMBDABAR's; when one is found in an event, the other is found in the same event with a probability that exceeds 50%. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. INDIANA UNIV,BLOOMINGTON,IN 47405. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PURDUE UNIV,W LAFAYETTE,IN 47907. RP GELD, TL (reprint author), UNIV MICHIGAN,ANN ARBOR,MI 48109, USA. NR 16 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP 3949 EP 3954 DI 10.1103/PhysRevD.45.3949 PN 1 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900005 ER PT J AU ARNDT, RA ROPER, LD WORKMAN, RL MCNAUGHTON, MW AF ARNDT, RA ROPER, LD WORKMAN, RL MCNAUGHTON, MW TI NUCLEON-NUCLEON PARTIAL-WAVE ANALYSIS TO 1.6-GEV SO PHYSICAL REVIEW D LA English DT Article ID SPIN-CORRELATION PARAMETER; PP-ELASTIC-SCATTERING; PROTON CHARGE-EXCHANGE; ANN THETA-STAR; NEUTRON-PROTON; ANALYZING POWER; GEV-C; COUPLING-CONSTANT; POLARIZATION; DEPENDENCE AB An energy-dependent analysis and set of energy-independent analyses are presented for the nucleon-nucleon elastic-scattering data below 1.6 GeV. The database from which the energy-dependent and 25 pp (18 np) single-energy solutions are obtained consists of 11 880 pp and 7572 np data. A resonancelike structure is found to occur in the D-1(2), F-3(3), and P-3(2)-F-3(2) partial waves; this behavior is associated with poles in the complex energy plane. The pole positions and residues are obtained through analytic continuation of the "production" piece of the T matrix obtained in the energy-dependent solution. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ARNDT, RA (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061, USA. NR 56 TC 106 Z9 107 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 JUN 1 PY 1992 VL 45 IS 11 BP 3995 EP 4001 DI 10.1103/PhysRevD.45.3995 PN 1 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900011 ER PT J AU BJORKEN, JD AF BJORKEN, JD TI FRACTAL PHASE-SPACE AS A DIAGNOSTIC-TOOL FOR HIGH-ENERGY MULTIJET PROCESSES SO PHYSICAL REVIEW D LA English DT Article ID TRANSVERSE AB The fractal phase space introduced by the Lund group for the description of QCD multijet phenomena is discussed using a different choice of coordinates. We advocate these coordinates as a useful diagnostic tool in the analysis of complex event structures. Features of QCD such as color coherence or "angular ordering," and the "string effect," are described in this language. RP BJORKEN, JD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 14 TC 31 Z9 31 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP 4077 EP 4087 DI 10.1103/PhysRevD.45.4077 PN 1 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900018 ER PT J AU SLAVEN, DH YOUNG, BL AF SLAVEN, DH YOUNG, BL TI RENORMALIZING THE GAUGED WESS-ZUMINO-WITTEN LAGRANGIAN TO ONE LOOP IN A ONE-FAMILY TECHNICOLOR MODEL SO PHYSICAL REVIEW D LA English DT Article ID SYMMETRY-BREAKING; HIERARCHIES; DECAY; SCALE; MASS AB We examine the problems of calculating processes to one loop in a Wess-Zumino-Witten model, using one-family technicolor as an example and gauging the QCD subgroup of the chiral symmetry of technifermions. In particular, we examine decay processes of certain technipions, often denoted P0' and P8(0'). We find that almost all of the ultraviolet divergences cancel. The cancellation of infrared divergences between processes with degenerate final states provides us with a constraint on our renormalization scheme. We also study the effects of different d-dimensional prescriptions for epsilon(mu-nu-alpha-beta) and gamma-5 in dimensional regularization. (The matrix gamma-5 appears when we include possible extended technicolor couplings between technipions and ordinary fermions.) In the end, we choose MSBAR renormalization, and a noncovariant prescription for epsilon(mu-nu-alpha-beta) and gamma-5. We also present one-loop corrections to the width of the P0'. These tum out to be sizable. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. NR 19 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP 4270 EP 4282 DI 10.1103/PhysRevD.45.4270 PN 1 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900036 ER PT J AU MATTIS, MP MCLERRAN, L YAFFE, LG AF MATTIS, MP MCLERRAN, L YAFFE, LG TI HIGH-ENERGY ANOMALOUS SCATTERING - IS IT SEMICLASSICAL SO PHYSICAL REVIEW D LA English DT Article ID BARYON-NUMBER; AMPLITUDES AB We discuss the possibility of a semiclassical evaluation of baryon-number-nonconserving scattering amplitudes at "nonperturbative" energies of order M(W)/alpha(W). Semiclassical expansions around standard instanton configurations are known not to be valid at these energies: multiloop radiative corrections are not suppressed relative to tree-graph contributions. Despite this pathology, we present a conjecture showing how anomalous scattering at such nonperturbative energies may nevertheless remain semiclassically calculable, and discuss partial results supporting this conjecture. To determine the correct weak-coupling behavior of high-energy anomalous scattering amplitudes, we argue that one must solve a modified set of classical field equations, or equivalently sum suitably modified tree graphs. C1 UNIV MINNESOTA,DEPT PHYS,MINNEAPOLIS,MN 55455. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. RP MATTIS, MP (reprint author), LOS ALAMOS NATL LAB,DIV THEORET T-8,LOS ALAMOS,NM 87545, USA. NR 29 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP 4294 EP 4302 DI 10.1103/PhysRevD.45.4294 PN 1 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900038 ER PT J AU SLAVEN, D YOUNG, BL ZHANG, XM AF SLAVEN, D YOUNG, BL ZHANG, XM TI TOP-LOOP CORRECTION TO NEUTRAL-PSEUDO-GOLDSTONE-BOSON COUPLINGS SO PHYSICAL REVIEW D LA English DT Note ID TECHNICOLOR THEORIES; BREAKING AB The existence of a heavy quark can affect the physics at a higher energy scale, which does not usually happen in the case of light quarks. A point in question is the heavy-top-quark loop enhancement of the gluon couplings to pseudo Goldstone bosons which arise from dynamically broken models. This changes some of the coupling strengths which ordinarily arise from the Wess-Zumino-Witten term. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP SLAVEN, D (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 24 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP 4349 EP 4352 DI 10.1103/PhysRevD.45.4349 PN 1 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900048 ER PT J AU ALVERSON, G BAKER, WF BALLOCCHI, G BENSON, R BERG, D BLUSK, S BROMBERG, C BROWN, D CAREY, D CHAND, T CHANDLEE, C CHOUDHARY, BC CHUNG, WH DEBARBARO, L DESOI, W DLUGOSZ, W DUNLEA, J EASO, S ENGELS, E FAISSLER, W FANOURAKIS, G FERBEL, T GARELICK, D GINTHER, G GLASS, G GLAUBMAN, M GUTIERREZ, P HARTMAN, K HUSTON, J JOHNSTONE, C KAPOOR, V KOURBANIS, I LANARO, A LIRAKIS, C LOBKOWICZ, F LUKENS, P MANI, S MAUL, A MANSOUR, J MILLER, R NELSON, CA OH, B ORRIS, D POTHIER, E PREBYS, E RAJARAM, BM ROSER, R RUDDICK, K SHEPARD, P SHIVPURI, RK SINANIDIS, A SKOW, D SLATTERY, P SORRELL, L TOOTHACKER, W VARELAS, N WEERASUNDARA, D WHITMORE, J WU, G YASUDA, T YOSEF, C ZIELINSKI, M AF ALVERSON, G BAKER, WF BALLOCCHI, G BENSON, R BERG, D BLUSK, S BROMBERG, C BROWN, D CAREY, D CHAND, T CHANDLEE, C CHOUDHARY, BC CHUNG, WH DEBARBARO, L DESOI, W DLUGOSZ, W DUNLEA, J EASO, S ENGELS, E FAISSLER, W FANOURAKIS, G FERBEL, T GARELICK, D GINTHER, G GLASS, G GLAUBMAN, M GUTIERREZ, P HARTMAN, K HUSTON, J JOHNSTONE, C KAPOOR, V KOURBANIS, I LANARO, A LIRAKIS, C LOBKOWICZ, F LUKENS, P MANI, S MAUL, A MANSOUR, J MILLER, R NELSON, CA OH, B ORRIS, D POTHIER, E PREBYS, E RAJARAM, BM ROSER, R RUDDICK, K SHEPARD, P SHIVPURI, RK SINANIDIS, A SKOW, D SLATTERY, P SORRELL, L TOOTHACKER, W VARELAS, N WEERASUNDARA, D WHITMORE, J WU, G YASUDA, T YOSEF, C ZIELINSKI, M TI PRODUCTION OF PI-0 MESONS AT HIGH PT IN PI-BE AND PBE COLLISIONS AT 500 GEV/C SO PHYSICAL REVIEW D LA English DT Note ID PARTON DISTRIBUTION-FUNCTIONS; LARGE TRANSVERSE-MOMENTUM; 280 GEV/C; Q2-DEPENDENT PARAMETRIZATIONS; PROTONS; PHOTONS; HADRONS AB We present new measurements of pi-0 production at high transverse momenta (p(T)) for pi- and p interactions on Be and Cu targets at 500 GeV/c. The observed dependence of the yields as a function of p(T) and rapidity (y) is compared with expectations from leading-log QCD over a kinematic range in which the inclusive cross sections fall by more than 4 order of magnitude. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV DELHI,DELHI 110007,INDIA. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. UNIV OKLAHOMA,NORMAN,OK 73019. PENN STATE UNIV,UNIV PK,PA 16802. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV ROCHESTER,ROCHESTER,NY 14627. RP ALVERSON, G (reprint author), NORTHEASTERN UNIV,BOSTON,MA 02115, USA. RI Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011 NR 21 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP R3899 EP R3902 PN 1 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900001 ER PT J AU RIZZO, TG AF RIZZO, TG TI DESERT GRAND UNIFIED THEORIES AND NEW LIGHT DEGREES OF FREEDOM SO PHYSICAL REVIEW D LA English DT Note AB We show that by introducing additional degrees of freedom with masses of the order of the electroweak scale the usual predictions for the proton lifetime and sin2-theta(W) obtained in the contexts of grand-unified-theory models with deserts can now be made to agree with current experimental data. We tabulate a number of possible quantum number assignments for these new particles. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 9 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1992 VL 45 IS 11 BP R3903 EP R3905 PN 1 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX379 UT WOS:A1992HX37900002 ER PT J AU HIKASA, K HAGIWARA, K KAWABATA, S BARNETT, RM GROOM, DE TRIPPE, TG WOHL, CG YOST, GP ARMSTRONG, B WAGMAN, GS STONE, J PORTER, FC MORRISON, RJ CUTKOSKY, RE MONTANET, L AGUILARBENITEZ, M CASO, C CRAWFORD, RL ROOS, M TORNQVIST, NA HAYES, KG HOHLER, G MANLEY, DM OLIVE, KA SHROCK, RE EIDELMAN, S SCHINDLER, RH HERNANDEZ, JJ CONFORTO, G EICHLER, RA AF HIKASA, K HAGIWARA, K KAWABATA, S BARNETT, RM GROOM, DE TRIPPE, TG WOHL, CG YOST, GP ARMSTRONG, B WAGMAN, GS STONE, J PORTER, FC MORRISON, RJ CUTKOSKY, RE MONTANET, L AGUILARBENITEZ, M CASO, C CRAWFORD, RL ROOS, M TORNQVIST, NA HAYES, KG HOHLER, G MANLEY, DM OLIVE, KA SHROCK, RE EIDELMAN, S SCHINDLER, RH HERNANDEZ, JJ CONFORTO, G EICHLER, RA TI REVIEW OF PARTICLE PROPERTIES SO PHYSICAL REVIEW D LA English DT Review ID PARTIAL-WAVE ANALYSIS; BARYON MAGNETIC-MOMENTS; INELASTIC MUON SCATTERING; KOBAYASHI-MASKAWA MATRIX; PROMPT PHOTON PRODUCTION; TRANSITION RADIATION DETECTOR; NUCLEON STRUCTURE FUNCTIONS; PAULI EXCLUSION-PRINCIPLE; HIGGS-BOSON MASS; SEMILEPTONIC NEUTRINO SCATTERING AB In this Review, we list, evaluate. and average measured properties of gauge bosons, leptons, quarks, mesons, and baryons. We also summarize searches for hypothetical particles such as Higgs bosons, the top quark, heavy neutrinos, monopoles, and supersymmetric particles. All the particle properties and search limits are listed in Summary Tables. We also give numerous tables, figures, formulae, and reviews of topics such as the Standard Model, particle detectors, probability, and statistics. A booklet is available containing the Summary Tables and abbreviated versions of some other sections of this full Review. C1 LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. CALTECH,DEPT PHYS,PASADENA,CA 91125. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. UNIV GENOA,IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HELSINKI,DEPT PHYS,SF-00170 HELSINKI 17,FINLAND. IST NAZL FIS NUCL,I-50125 FLORENCE,ITALY. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. HILLSDALE COLL,DEPT PHYS,HILLSDALE,MI 49242. UNIV KARLSRUHE,INST THEORET KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. KENT STATE UNIV,DEPT PHYS,KENT,OH 44242. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794. NOVOSIBIRSK NUCL PHYS INST,NOVOSIBIRSK 630090,USSR. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. UNIV VALENCIA,CSIC,INST FIS CORPUSCULAR,E-46100 BURJASSOT,SPAIN. UNIV URBINO,I-61029 URBINO,ITALY. ETH ZURICH,INST MITTELENERGIEPHYS,CH-5232 VILLIGEN,SWITZERLAND. CTR INVEST ENERGET MEDICAMBIENTALES & TECHNOL,E-28040 MADRID,SPAIN. RP HIKASA, K (reprint author), NATL LAB HIGH ENERGY PHYS,OHO,IBARAKI 305,JAPAN. RI Hernandez-Rey, Juan Jose/N-5955-2014 OI Hernandez-Rey, Juan Jose/0000-0002-1527-7200 NR 828 TC 673 Z9 673 U1 1 U2 15 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 JUN 1 PY 1992 VL 45 IS 11 BP S1 EP & PN 2 PG 0 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX380 UT WOS:A1992HX38000001 ER PT J AU ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CARROLL, TJ CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H VIDAL, M WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T AF ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CARROLL, TJ CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H VIDAL, M WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI SATURATION OF SHADOWING AT VERY LOW BJORKEN-X SO PHYSICAL REVIEW LETTERS LA English DT Article ID MUON SCATTERING; NUCLEAR AB The ratio of cross sections for inelastic muon scattering on xenon and deuterium nuclei was measured at very low Bjorken x (0.00002 < x(Bj) < 0.25). The data were taken at Fermilab experiment E665 with a 490 GeV/c muon beam incident on liquid deuterium and gaseous xenon targets. Two largely independent analysis techniques gave statistically consistent results. The xenon-to-deuterium per-nucleon cross-section ratio is constant at approximately 0.7 for x(Bj) below 0.003. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. HARVARD UNIV,CAMBRIDGE,MA 02138. STANISLAW STASZIC UNIV MIN & MET,INST NUCL PHYS,PL-30059 KRAKOW,POLAND. MIT,CAMBRIDGE,MA 02139. MAX PLANCK INST PHYS & ASTROPHYS,W-8000 MUNICH 40,GERMANY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV WUPPERTAL,W-5600 WUPPERTAL,GERMANY. YALE UNIV,NEW HAVEN,CT 06511. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. UNIV MARYLAND,COLLEGE PK,MD 20742. RP ADAMS, MR (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. RI Carroll, Timothy/B-6934-2009 NR 17 TC 110 Z9 110 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 JUN 1 PY 1992 VL 68 IS 22 BP 3266 EP 3269 DI 10.1103/PhysRevLett.68.3266 PG 4 WC Physics, Multidisciplinary SC Physics GA HW978 UT WOS:A1992HW97800003 ER PT J AU KOCH, JA MACGOWAN, BJ DASILVA, LB MATTHEWS, DL UNDERWOOD, JH BATSON, PJ MROWKA, S AF KOCH, JA MACGOWAN, BJ DASILVA, LB MATTHEWS, DL UNDERWOOD, JH BATSON, PJ MROWKA, S TI OBSERVATION OF GAIN-NARROWING AND SATURATION BEHAVIOR IN SE X-RAY LASER LINE-PROFILES SO PHYSICAL REVIEW LETTERS LA English DT Article ID EMISSION AB We report on the first successful measurements of thc spectral width of an x-ray laser line. The experiments observed the 206.38-angstrom laser in Ne-like Se and indicate an unamplified width of 50 m angstrom, show gain narrowing to 10 m angstrom in intermediate length amplifiers, and show no significant rebroadening in saturated amplifiers. The unamplified width is 1.4 times the expected Doppler width, and the lack of rebroadening leads to speculation that collisional effects may play a significant role in determining the line profiles. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP KOCH, JA (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, LIVERMORE, CA 94550 USA. NR 30 TC 107 Z9 112 U1 0 U2 4 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 JUN 1 PY 1992 VL 68 IS 22 BP 3291 EP 3294 DI 10.1103/PhysRevLett.68.3291 PG 4 WC Physics, Multidisciplinary SC Physics GA HW978 UT WOS:A1992HW97800010 ER PT J AU WOLF, D AF WOLF, D TI RECONSTRUCTION OF NACL SURFACES FROM A DIPOLAR SOLUTION TO THE MADELUNG PROBLEM SO PHYSICAL REVIEW LETTERS LA English DT Article ID POTENTIALS AB Based on the manner in which large Coulomb terms with opposite signs cancel each other at long range, it is proposed that most ionic-crystal surfaces undergo a simple zero-temperature reconstruction, a prediction validated by computer simulation of surfaces in rocksalt-structured materials. RP WOLF, D (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 15 TC 240 Z9 239 U1 1 U2 25 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 JUN 1 PY 1992 VL 68 IS 22 BP 3315 EP 3318 DI 10.1103/PhysRevLett.68.3315 PG 4 WC Physics, Multidisciplinary SC Physics GA HW978 UT WOS:A1992HW97800016 ER PT J AU ARUNASALAM, V AF ARUNASALAM, V TI ANGULAR-MOMENTUM, G-VALUE, AND MAGNETIC-FLUX OF GYRATION STATES SO PHYSICS ESSAYS LA English DT Article DE LANDAU GYRATION STATES; G VALUE OF CYCLOTRON MOTION; ANGULAR MOMENTUM OF GYRATION STATES; HALF-INTEGRAL ORBITAL ANGULAR MOMENTUM; UNIT OF MAGNETIC FLUX; SPINLESS CANONICAL G VALUE OF 2; MONOPOLE-CHARGED PARTICLE COMPOSITES; SCHWINGERS DYONS; CHARGED PARTICLE-FLUX COMPOSITES; ANGULAR MOMENTUM OF VELOCITY-DEPENDENT POTENTIALS; FIELD-PARTICLE INTERACTION SPIN AND STATISTICS AB Two of the world's leading (Nobel laureate) physicists disagree on the definition of the orbital angular momentum L of the Landau gyration states of a spinless charged particle in a uniform external magnetic field B = Bi(z). According to Feynman (and Wilczek), L = (r x mu-v) = r x (p - qA/c), while Bloch (and Huang) defines it as L = r x p. We show here that Bloch's definition is the correct one, since it satisfies the necessary and sufficient condition L x L = iHBAR L, while Feynman's definition does not. However, as a consequence of the quantized Aharonov-Bohm magnetic flux, this canonical orbital angular momentum (surprisingly enough) takes half-odd-integral values with a zero-point gyration state of L(Z) = HBAR/2. Further, since the diamagnetic and the paramagnetic contributions to the magnetic moment are interdependent, the a value of these gyration states is two and not one, again a surprising result for a spinless case. Also discussed from a pedestrian viewpoint are the differences between the gauge invariance in classical and quantum mechanics, Onsager's suggestion that the flux quantization might be an intrinsic property of the electromagnetic field-charged particle interaction, the possibility that the experimentally measured fundamental unit of the flux quantum need not necessarily imply the existence of "electron pairing" of the Bardeen-Cooper-Schrieffer (BCS) superconductivity theory, and the relationship to the Dirac angular momentum quantization condition for the magnetic monopole-charged particle composites (i.e., Schwinger's dyons). RP ARUNASALAM, V (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 0 TC 2 Z9 2 U1 0 U2 2 PU UNIV TORONTO PRESS INC PI TORONTO PA JOURNALS DIVISION, 5201 DUFFERIN ST, DOWNSVIEW, TORONTO ON M3H 5T8, CANADA SN 0836-1398 J9 PHYS ESSAYS JI Phys. Essays PD JUN PY 1992 VL 5 IS 2 BP 286 EP 298 PG 13 WC Physics, Multidisciplinary SC Physics GA HW723 UT WOS:A1992HW72300020 ER PT J AU GUREVICH, AV MILIKH, GM ROUSSELDUPRE, R AF GUREVICH, AV MILIKH, GM ROUSSELDUPRE, R TI RUNAWAY ELECTRON MECHANISM OF AIR BREAKDOWN AND PRECONDITIONING DURING A THUNDERSTORM SO PHYSICS LETTERS A LA English DT Article ID X-RAYS AB The possibility is considered of an avalanche-type increase of the number of runaway electrons leading to a new type of electric breakdown of gases. This type of breakdown could take place in the atmosphere during a thunderstorm stimulated by cosmic ray secondaries. C1 UNIV MARYLAND,COLLEGE PK,MD 20742. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GUREVICH, AV (reprint author), PN LEBEDEV PHYS INST,MOSCOW 117924,USSR. RI Gurevich, Aleksandr/K-8668-2015 OI Gurevich, Aleksandr/0000-0003-1125-9774 NR 12 TC 423 Z9 437 U1 2 U2 10 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 JUN 1 PY 1992 VL 165 IS 5-6 BP 463 EP 468 DI 10.1016/0375-9601(92)90348-P PG 6 WC Physics, Multidisciplinary SC Physics GA HZ377 UT WOS:A1992HZ37700014 ER PT J AU ROSENAU, P ORON, A HYMAN, JM AF ROSENAU, P ORON, A HYMAN, JM TI BOUNDED AND UNBOUNDED PATTERNS OF THE BENNEY EQUATION SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Letter ID INCLINED PLANE; WAVES; EVOLUTION; BREAKING AB The boundedness of 2-D liquid film flows on an inclined plane in the context of the regularized Benney, u(tau) + lambda-u2u(x) + [(mu-u6 - nu-u3)u(x)]x + sigma{u3[u(xx)/(1 + epsilon-2u(x)2)3/2]x}x = 0, and the Benney (epsilon = 0) equation are studied. Here u, x, tau are the rescaled film thickness, the longitudinal coordinate, and time, respectively; lambda, mu, and nu are non-negative constants determined at equilibrium; and epsilon is the parameter related to the film aspect ratio. For a vertical plane (nu = 0) a critical curve lambda = lambda(c)(mu) has been found bifurcating from the point (lambda,mu) = (0, 1) which divides the lambda-mu space into two domains. When lambda > lambda(c)(mu) the initial data evolves into modulating traveling waves similar to the solutions of the Kuramoto-Sivashinsky equation. However, when lambda < lambda(c)(mu), either an infinite spike forms in the solution in finite time and the original Benney model breaks down or the solution of the regularized Benney equation forms an infinite slope when the wavelike solution attempts to become multivalued. In a tilted plane (nu > 0) the boundedness of the emerging pattern is sensitive to the choice of initial data. It is also found that the Benney equation does not describe wave breaking where the solution develops an infinite slope. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP ROSENAU, P (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT MECH ENGN,IL-32000 HAIFA,ISRAEL. NR 9 TC 37 Z9 37 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD JUN PY 1992 VL 4 IS 6 BP 1102 EP 1104 DI 10.1063/1.858228 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA HU800 UT WOS:A1992HU80000002 ER PT J AU MANLEY, OP AF MANLEY, OP TI THE DISSIPATION RANGE SPECTRUM SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Note ID TURBULENT AB It is shown that the available data for the skewness of velocity derivatives in turbulent flows are consistent with a simple exponential decay in the dissipation range, i.e., approximately exp (- ak), rather than approximately exp (- ak(m)), where m > 1. RP MANLEY, OP (reprint author), US DOE,OFF BASIC ENERGY SCI,WASHINGTON,DC 20585, USA. NR 7 TC 12 Z9 12 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD JUN PY 1992 VL 4 IS 6 BP 1320 EP 1321 DI 10.1063/1.858408 PG 2 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA HU800 UT WOS:A1992HU80000027 ER PT J AU ROSE, HA DUBOIS, DF AF ROSE, HA DUBOIS, DF TI MODIFICATION OF STIMULATED BRILLOUIN, SATURATED RAMAN-SCATTERING AND STRONG LANGMUIR TURBULENCE BY NONLOCAL HEAT-TRANSPORT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter AB The linear instability analysis of stimulated Brillouin backscatter (SBS) is revisited to study the effect of nonlocal electron heat transport that enhances the density modulation over that caused by the ponderomotive pressure. It is found that the intensity threshold is lowered by a factor of roughly the inverse of 1 + 1000 (n(e)/n(c))ln LAMBDA(Z3/2/T(eV)2)/lambda(mu), where T(eV) is the electron temperature in eV and lambda(mu) is the laser wavelength in microns, provided that lambda(mu)T(eV)2(n(c)/n(e)) >> 50 ln LAMBDA square-root Z. A similar reduction in the threshold for Langmuir decay is found, which, in the case of stimulated Raman scattering (SRS), may lead to a reduced saturation level for SRS. RP ROSE, HA (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 15 TC 18 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1394 EP 1396 DI 10.1063/1.860098 PG 3 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400004 ER PT J AU FU, GY COOPER, WA GRUBER, R SCHWENN, U ANDERSON, DV AF FU, GY COOPER, WA GRUBER, R SCHWENN, U ANDERSON, DV TI FULLY 3-DIMENSIONAL IDEAL MAGNETOHYDRODYNAMIC STABILITY ANALYSIS OF LOW-N MODES AND MERCIER MODES IN STELLARATORS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ADVANCED TOROIDAL FACILITY; MHD EQUILIBRIUM; INSTABILITIES; EXPANSION; ERATO; HERA; CODE AB The TERPSICHORE three-dimensional linear ideal magnetohydrodynamic (MHD) stability code [Theory of Fusion Plasmas, Proceedings of the Joint Varenna-Lausanne International Workshop, Chexbres, Switzerland, 1988 (Editrice Compositori, Bologna, Italy, 1989), p. 93; Controlled Fusion and Plasma Heating, Proceedings of the 17th European Conference, Amsterdam, The Netherlands (European Physical Society, Petit-Lancy, Switzerland, 1990), Vol. 14B, Part II, p. 931; Theory of Fusion Plasmas, Proceedings of the Joint Varenna-Lausanne International Workshop, Valla Monastero, Varenna, Italy, 1990 (Editrice Compositori, Bologna, Italy, 1990), p. 655] has been extended to the full MHD equations. The new code is used to calculate the physical growth rates of nonlocal low-n modes for l = 2 torsatron configurations. A comprehensive investigation of the relation between the Mercier modes and the low-n modes has been performed. The unstable localized low-n modes are found to be correlated with the Mercier criterion. Finite growth rates of the low-n modes correspond to finite values of the Mercier criterion parameter. Near the Mercier marginal stability boundary, the low-n modes tend to be weakly unstable with very small growth rates. However, the stability of global-type low-n modes is found to be decorrelated from that of Mercier modes. The low-n modes with global radial structures can be more stable or more unstable than Mercier modes. C1 MAX PLANCK INST PLASMA PHYS, EURATOM IPP ASSOC, W-8046 GARCHING, GERMANY. LAWRENCE LIVERMORE NATL LAB, CTR NATL ENERGY RES SUPERCOMP, LIVERMORE, CA 94550 USA. RP FU, GY (reprint author), ECOLE POLYTECH FED LAUSANNE, ASSOC EURATOM CONFEDERAT SUISSE, CTR RECH PHYS PLASMAS, CH-1007 LAUSANNE, SWITZERLAND. NR 31 TC 22 Z9 22 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1401 EP 1411 DI 10.1063/1.860100 PG 11 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400006 ER PT J AU VITELLO, P CERJAN, C BRAUN, D AF VITELLO, P CERJAN, C BRAUN, D TI FLOW - A 2-DIMENSIONAL TIME-DEPENDENT HYDRODYNAMICAL ION EXTRACTION MODEL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID HYPERBOLIC CONSERVATION-LAWS; PLASMA; SCHEME AB The simulation of ion extraction from a quasineutral plasma is described using a two-dimensional time-dependent numerical fluid equation code, FLOW. Ion motion is treated using the cold ion continuity and momentum conservation equations in the potential field of complex structures. An upwind differencing scheme in Cartesian coordinates is used to solve these fluid equations. The plasma electrons are modeled as having a Maxwell-Boltzmann distribution, which allows for ion acoustic effects inside the plasma. The growth and evolution of two-dimensional ion sheaths is treated while evaluating the ion flux collected on the extractor surface. It is found that spatial grids very much coarser than the Debye length (of order ten times larger or greater) can be successfully used to accurately model ion extraction. Although the transition region between the high density quasineutral plasma and the ion sheath is not resolved, the ion flux across this region is still obtained correctly. The assumption of a Maxwell-Boltzmann distribution for the electrons requires the solution of a highly nonlinear Poisson equation. Previous approaches to this problem have relied upon a Newton-Raphson root search with standard iterative techniques for the resulting linearized equations. A new methodology is described here using the recently developed strongly implicit procedure (SIP), which has been optimized for the discretized two-dimensional Laplace operator. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 31 TC 30 Z9 30 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1447 EP 1456 DI 10.1063/1.860055 PG 10 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400013 ER PT J AU SIGMAR, DJ HSU, CT WHITE, R CHENG, CZ AF SIGMAR, DJ HSU, CT WHITE, R CHENG, CZ TI ALPHA-PARTICLE LOSSES FROM TOROIDICITY-INDUCED ALFVEN EIGENMODES .2. MONTE-CARLO SIMULATIONS AND ANOMALOUS ALPHA-LOSS PROCESSES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAK; EXCITATION; WAVES; MODES; BEAM AB Fusion-born alpha particles moving parallel to the magnetic field can resonate with toroidal Alfven eigenmodes (TAE) leading to anomalous alpha-orbit diffusion across the alpha-loss boundaries in a tokamak. This is analyzed using the Hamiltonian guiding center code ORBIT in conjunction with the kinetic magnetohydrodynamics (MHD) eigenmode solving code NOVA-K. Resonant single alpha orbits are studied below and above the threshold for orbit stochasticity and Monte Carlo randomized ensembles of alphas subjected to a finite amplitude time-dependent TAE are followed with respect to their radial losses using realistic MHD equilibria and numerically computed toroidal Alfven eigenfunctions for one toroidal eigenmode n = 1 and the full Fourier spectrum of poloidal harmonics m involved in the "gap mode". The alpha-loss mechanisms are resonant drift motion across the loss boundaries of alphas born near these boundaries and stochastic diffusion to the boundaries in constants of the motion (phase) space. After a first transient of resonant drift losses scaling as B(r) approximately/B0, the number of alphas lost via diffusion scales as (B(r) approximately/B0)2. For TAE amplitudes B(r) approximately/B0 greater-than-or-equal-to 10(-3), alpha orbit stochasticity sets in and, depending on the radial width of the fast alpha density n(alpha (r), a substantial fraction of alphas can be lost in one slowing down time. For B(r) approximately/B0 < 10(-4), the losses become insignificant. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP SIGMAR, DJ (reprint author), MIT,CTR PLASMA FUS,167 ALBANY ST,NW16-250,CAMBRIDGE,MA 02139, USA. RI Cheng, Chio/K-1005-2014 NR 31 TC 109 Z9 109 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1506 EP 1516 DI 10.1063/1.860061 PG 11 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400019 ER PT J AU PRASAD, MK ESTABROOK, KG HARTE, JA CRAXTON, RS BOSCH, RA BUSCH, GE KOLLIN, JS AF PRASAD, MK ESTABROOK, KG HARTE, JA CRAXTON, RS BOSCH, RA BUSCH, GE KOLLIN, JS TI HOLOGRAPHIC INTERFEROGRAMS FROM LASER FUSION CODE SIMULATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PLASMA AB The simulation of interferograms for laser fusion-type targets is described. Three-dimensional ray-tracing postprocessors to the two-dimensional hydrodynamic codes LASNEX and SAGE are used for this purpose. Simulated interferograms can then be directly compared with experimentally obtained interferograms, thus providing insight into various aspects of target physics, such as anisotropic thermal transport and details of the hydrodynamic flow. The method is illustrated for two specific KMS microdisk target shots diagnosed with double-exposure holographic interferometry. C1 UNIV ROCHESTER,LASER ENERGET LAB,ROCHESTER,NY 14623. KMS IND,ANN ARBOR,MI 48106. RP PRASAD, MK (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 24 TC 10 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1569 EP 1575 DI 10.1063/1.860464 PG 7 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400025 ER PT J AU TRACY, MD DEGROOT, JS ESTABROOK, KG CAMERON, SM AF TRACY, MD DEGROOT, JS ESTABROOK, KG CAMERON, SM TI DETAILED 266 NM THOMSON SCATTERING MEASUREMENTS OF A LASER-HEATED PLASMA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID BRILLOUIN-SCATTERING; STIMULATED RAMAN; 2-PLASMON DECAY; DIAGNOSTICS; SATURATION; ELECTRON; DESIGN AB Collective Thomson scattering at 266 nm is used to obtain spatially resolved, two-dimensional electron density, temperature, and radial drift profiles of a collisional laser plasma (critical density, n(c) = 1 x 10(21) cm-3). An ultraviolet diagnostic wavelength minimizes the complicating effects of inverse bremsstrahlung and refractive turning in the coronal region of interest, where electron densities approach n(c)/10. Laser plasmas of this type are important because they model some of the aspects of the plasmas found in high-gain laser-fusion pellets irradiated by long pulse widths (t(L) greater-than-or-similar-to 10 nsec), where laser light is absorbed mostly in the corona. The experimental results and LASNEX [Comments Plasma Phys. Controlled Fusion 2, 51 (1975)] simulations agree within a percent standard deviation of 40% for electron density and 50% for electron temperature and radial drift velocity. Thus it is shown that the hydrodynamics equations with classical coefficients and the numerical approximations in LASNEX are valid models of laser-heated, highly collisional plasmas. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,PLASMA RES GRP,DAVIS,CA 95616. RP TRACY, MD (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616, USA. NR 30 TC 17 Z9 17 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1576 EP 1584 DI 10.1063/1.860066 PG 9 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400026 ER PT J AU GINSPARG, P AF GINSPARG, P TI COMPUTOPIA, HERE WE COME SO PHYSICS TODAY LA English DT Letter RP GINSPARG, P (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 2 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1992 VL 45 IS 6 BP 13 EP & DI 10.1063/1.2809686 PG 0 WC Physics, Multidisciplinary SC Physics GA HY868 UT WOS:A1992HY86800003 ER PT J AU POST, RF AF POST, RF TI DEPACKH,DAVID,C. - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual RP POST, RF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1992 VL 45 IS 6 BP 98 EP 98 DI 10.1063/1.2809711 PG 1 WC Physics, Multidisciplinary SC Physics GA HY868 UT WOS:A1992HY86800015 ER PT J AU PENARRUBIA, L AGUILAR, M MARGOSSIAN, L FISCHER, RL AF PENARRUBIA, L AGUILAR, M MARGOSSIAN, L FISCHER, RL TI AN ANTISENSE GENE STIMULATES ETHYLENE HORMONE PRODUCTION DURING TOMATO FRUIT RIPENING SO PLANT CELL LA English DT Article ID 1-AMINOCYCLOPROPANE-1-CARBOXYLIC ACID; PRECLIMACTERIC TOMATO; HIGHER-PLANTS; BIOSYNTHESIS; EXPRESSION; SYNTHASE; SUPPRESSION; CAPABILITY; DNA AB The ripening of many fruits is controlled by an increase in ethylene hormone concentration. E8 is a fruit ripening protein that is related to the enzyme that catalyzes the last step in the ethylene biosynthesis pathway, 1-aminocyclopropane-1-carboxylic (ACC) oxidase. To determine the function of E8, we have transformed tomato plants with an E8 antisense gene. We show here that the antisense gene inhibits the accumulation of E8 protein during ripening. Whereas others have shown that reduction of ACC oxidase results in reduced levels of ethylene biosynthesis, we find that reduction of the related E8 protein produces the opposite effect, an increase in ethylene evolution specifically during the ripening of detached fruit. Thus, E8 has a negative effect on ethylene production in fruit. C1 LAWRENCE BERKELEY LAB,DEPT PLANT BIOL,BERKELEY,CA 94720. NR 38 TC 63 Z9 65 U1 0 U2 9 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 1040-4651 J9 PLANT CELL JI Plant Cell PD JUN PY 1992 VL 4 IS 6 BP 681 EP 687 PG 7 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA JA220 UT WOS:A1992JA22000008 ER PT J AU OR, TW KONG, PC PFENDER, E AF OR, TW KONG, PC PFENDER, E TI COUNTER-FLOW LIQUID INJECTION PLASMA SYNTHESIS OF SPINEL POWDERS SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE THERMAL PLASMA SYNTHESIS; COUNTERFLOW INJECTION; LIQUID PRECURSORS; SPINEL POWDERS ID AEROSOL DECOMPOSITION AB A novel counter-flow liquid injection plasma synthesis (CF-LIPS) reactor has been developed to produce ceramic powders. By using a counter-flow plasma configuration, entrainment of reactant particles into the plasma is improved compared to conventional injection methods. The counter-flow process also creates large recirculation zones which increase the residence time to more than 100 ms as predicted by modeling results [1]. The long residence time ensures complete evaporation and decomposition of precursor particles and complete reactions to the desirable products. Also, the process employs liquid precursors rather than solids, resulting in less contamination of products from unevaporated reactants. Results show that CF LIPS is an excellent method for producing single-phase and spherical spinel powders with a narrow particle size distribution. Particle size increases with increasing precursor concentration based on the synthesis of magnesium aluminate powders. Characterization techniques include X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), X-ray mapping, centrifugal sedimentation particle size distribution analysis, and vibrating sample magnetometer (VSM) measurements. In addition, crystallographic studies are conducted to determine the bond lengths, bond angles, and stoichiometries of the as-produced spinels. C1 EG&G IDAHO INC,INEL,IDAHO FALLS,ID 83415. RP OR, TW (reprint author), UNIV MINNESOTA,DEPT MECH ENGN,MINNEAPOLIS,MN 55455, USA. NR 14 TC 6 Z9 7 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4324 J9 PLASMA CHEM PLASMA P JI Plasma Chem. Plasma Process. PD JUN PY 1992 VL 12 IS 2 BP 189 EP 201 DI 10.1007/BF01447446 PG 13 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA HP883 UT WOS:A1992HP88300006 ER PT J AU KODAS, TT HAMPDENSMITH, MJ RYE, RR AF KODAS, TT HAMPDENSMITH, MJ RYE, RR TI DIRECT DEPOSITION OF PATTERNED COPPER-FILMS ON PTFE SO PLATING AND SURFACE FINISHING LA English DT Article ID POLY(TETRAFLUOROETHYLENE); RADIATION AB This paper highlights recent developments in a promising combination of conductor and substrate for integrated circuits, packaging and circuit boards-copper on Teflon *,1 (known generically as polytetra-fluoroethylene, or PTFE). Copper has one of the highest conductivities of all metals, while PTFE has one of the lowest dielectric constants, as well as low dissipation factors, good thermal stability and high chemical resistance. This combination of low resistivity and low dielectric constant is critical for packages, integrated circuits, and circuit boards operated at high frequencies. Three-step additive processes are described that allow direct deposition of patterned copper films on PTFE. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,CTR MICROENGN CERAM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP KODAS, TT (reprint author), UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD JUN PY 1992 VL 79 IS 6 BP 71 EP 73 PG 3 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA HY271 UT WOS:A1992HY27100013 ER PT J AU CRAM, LS MARTIN, JC STEINKAMP, JA YOSHIDA, TM BUICAN, TN MARRONE, BL JETT, JH SALZMAN, G SKLAR, L AF CRAM, LS MARTIN, JC STEINKAMP, JA YOSHIDA, TM BUICAN, TN MARRONE, BL JETT, JH SALZMAN, G SKLAR, L TI NEW FLOW CYTOMETRIC CAPABILITIES AT THE NATIONAL FLOW-CYTOMETRY RESOURCE SO PROCEEDINGS OF THE IEEE LA English DT Article AB The purpose of this article is to provide a brief review of flow cytometry and a broad view of new flow cytometry technologies. A brief introduction to flow cytometry and cell sorting is provided along with a summary of current commercial capabilities. New developments designed to overcome current limitations are described in terms of capabilities and a characterization of their performance. New capabilities include: Fourier transform flow cytometry, phase sensitive detection, digital data acquisition, data clustering algorithms, high speed sorting, and slit scanning. A list of recent review books and articles is provided to aid those wishing to learn details of the technology and the multitude of applications that have evolved RP CRAM, LS (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 22 TC 21 Z9 23 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9219 EI 1558-2256 J9 P IEEE JI Proc. IEEE PD JUN PY 1992 VL 80 IS 6 BP 912 EP 917 DI 10.1109/5.149453 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA JG019 UT WOS:A1992JG01900012 ER PT J AU VANDEVENDER, JP AF VANDEVENDER, JP TI PROLOG TO THE SPECIAL SECTION ON PULSED POWER TECHNOLOGY SO PROCEEDINGS OF THE IEEE LA English DT Editorial Material RP VANDEVENDER, JP (reprint author), SANDIA NATL LABS,PULSED POWER SCI,ALBUQUERQUE,NM 87185, USA. NR 0 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 0018-9219 J9 P IEEE JI Proc. IEEE PD JUN PY 1992 VL 80 IS 6 BP 931 EP 933 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JG019 UT WOS:A1992JG01900014 ER PT J AU RAMIREZ, JJ PRESTWICH, KR SMITH, ID AF RAMIREZ, JJ PRESTWICH, KR SMITH, ID TI HIGH-POWER, SHORT-PULSE GENERATORS BASED ON INDUCTION VOLTAGE ADDERS SO PROCEEDINGS OF THE IEEE LA English DT Article AB High-power, short-pulse generators based on induction voltage adders were identified by the pulsed power community as the most important recent advance in this field These systems use linear induction accelerator modules and self-magnetically insulated vacuum transmission lines to generate high-voltage (tens of megavolts), moderate-impedance (less-than-or-equal-to 200-OMEGA), short-duration (tens of nanoseconds) output pulses. Hermes III is a 20-MV, 16-TW electron beam accelerator and represents the most powerful implementation to date of the induction voltage adder technology. In this article we describe how these systems function, identify their advantages and limitations, and discuss present and proposed future applications. C1 PULSE SCI INC,SAN LEANDRO,CA 94577. RP RAMIREZ, JJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 36 TC 13 Z9 17 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD JUN PY 1992 VL 80 IS 6 BP 946 EP 957 DI 10.1109/5.149457 PG 12 WC Engineering, Electrical & Electronic SC Engineering GA JG019 UT WOS:A1992JG01900016 ER PT J AU QUINTENZ, JP DESJARLAIS, MP POINTON, TD SLUTZ, SA SEIDEL, DB MEHLHORN, TA COATS, RS KIEFER, ML KRALL, NA BACON, LD AF QUINTENZ, JP DESJARLAIS, MP POINTON, TD SLUTZ, SA SEIDEL, DB MEHLHORN, TA COATS, RS KIEFER, ML KRALL, NA BACON, LD TI THEORY OF INSTABILITY-GENERATED DIVERGENCE OF INTENSE ION-BEAMS FROM APPLIED-B ION DIODES SO PROCEEDINGS OF THE IEEE LA English DT Article ID INERTIAL CONFINEMENT FUSION; MAGNETICALLY INSULATED GAPS; RELATIVISTIC DIODES; ELECTRON FLOW; PBFA-II; STABILITY; FIELD; SIMULATION AB Over the course of the past few years, rapid progress has been made in the development of a theoretical understanding of the physics of applied-B ion diodes. Success in predicting diode current and voltage operating characteristics has been followed by new insight into the effects of electromagnetic instabilities on ion beam divergence. This paper describes recent advances in the analytic theory and numerical simulation of applied-B ion diodes in general and, in particular, the diodes being tested experimentally on the Particle Beam Fusion Accelerator II at Sandia National Laboratories, Albuquerque, NM. Numerical simulation of these diodes using the three-dimensional particle-in-cell code QUICKSILVER and analytic stability analysis have provided new insight into the physics governing instability-induced beam divergence. Experimental evidence of these instabilities is described and compared with the theory. When simulation parameters are chosen to model present experiments, QUICKSILVER calculates beam divergence near the measured value. Our new understanding of the nature of the electromagnetic instabilities and their effects on beam divergence has led to suggestions for improved diode design. A simulation of one of these design concepts shows divergence levels in the vicinity of 10 mrad, a level considered adequate for ignition experiments. C1 KRALL ASSOCIATES,DEL MAR,CA 92014. RP QUINTENZ, JP (reprint author), 1200 SANDIA NATL LABS,PULSED POWER SCI DIRECTORATE,ALBUQUERQUE,NM 87185, USA. NR 50 TC 10 Z9 10 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 0018-9219 J9 P IEEE JI Proc. IEEE PD JUN PY 1992 VL 80 IS 6 BP 971 EP 984 DI 10.1109/5.149459 PG 14 WC Engineering, Electrical & Electronic SC Engineering GA JG019 UT WOS:A1992JG01900018 ER PT J AU SOSINSKY, GE FRANCIS, NR DEROSIER, DJ WALL, JS SIMON, MN HAINFELD, J AF SOSINSKY, GE FRANCIS, NR DEROSIER, DJ WALL, JS SIMON, MN HAINFELD, J TI MASS DETERMINATION AND ESTIMATION OF SUBUNIT STOICHIOMETRY OF THE BACTERIAL HOOK BASAL BODY FLAGELLAR COMPLEX OF SALMONELLA-TYPHIMURIUM BY SCANNING-TRANSMISSION ELECTRON-MICROSCOPY SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE BACTERIAL CHEMOTAXIS; MASS MEASUREMENT; CRYOELECTRON MICROSCOPY; BACTERIAL MOTILITY; MOLECULAR MOTORS ID ESCHERICHIA-COLI; PROTEINS; MOTOR; IDENTIFICATION; RING AB The basal body, a part of the rotary motor of the bacterial flagellum, is a multiprotein assembly that consists of four rings (denoted M, S, P, and L) and an axial rod (denoted R). From analysis of scanning transmission electron microscopy images of hook-basal body preparations isolated from Salmonella typhimurium, we have determined the masses of the basal body and three of its subcomplexes. The mass of the basal body (i.e., the four rings and rod) is 4400 +/- 490 kDa (mean +/- SD; n = 54). The mass of the LPR subcomplex (i.e., L and P rings and the whole rod) is 2600 +/- 380 kDa (n = 55), that of the L and P rings and the distal part of the rod is 2100 +/- 320 kDa (n = 25), and the mass of the L and P ring subcomplex is 1700 +/- 260 kDa (n = 514). These results, together with the masses of the component proteins, indicate that the rings contain almost-equal-to 26 subunits each and that the mass of the rod is consistent with a composition of almost-equal-to 6 copies each of three of the rod proteins FlgB, FlgC, and FlgF and almost-equal-to 26 copies of FlgG as determined by Jones et al. [Jones, C. J., Macnab, R. M., Okino, H. & Aizawa, S.-I. (1990) J. Mol. Biol. 212, 377-3871 using quantitative gel electrophoresis. The results of Jones et al., together with ours, account for all proteins in the basal body to within almost-equal-to 5 % (or 200 kDa). C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP SOSINSKY, GE (reprint author), BRANDEIS UNIV,ROSENSTIEL BASIC MED SCI RES CTR,WALTHAM,MA 02254, USA. FU NCRR NIH HHS [RR01777, 1-S10-RR04671-01]; NIGMS NIH HHS [GM35433] NR 22 TC 57 Z9 58 U1 0 U2 2 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 JUN 1 PY 1992 VL 89 IS 11 BP 4801 EP 4805 DI 10.1073/pnas.89.11.4801 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HX168 UT WOS:A1992HX16800005 PM 1594581 ER PT J AU WATERS, LC ZELHOF, AC SHAW, BJ CHANG, LY AF WATERS, LC ZELHOF, AC SHAW, BJ CHANG, LY TI POSSIBLE INVOLVEMENT OF THE LONG TERMINAL REPEAT OF TRANSPOSABLE ELEMENT-17.6 IN REGULATING EXPRESSION OF AN INSECTICIDE RESISTANCE-ASSOCIATED P450-GENE IN DROSOPHILA SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID MESSENGER-RNA; ESTERASE GENE; SEQUENCE; MELANOGASTER; CYTOCHROME-P-450; AMPLIFICATION; DEGRADATION; MUTATION; EXCISION; SITE AB P450-A and P450-B are electrophoretically defined subsets of cytochrome P450 enzymes in Drosophila melanogaster. P450-A is present among all strains tested, whereas expression of P450-B is associated with resistance to insecticides. Monoclonal antibodies were used to obtain cDNA clones for an enzyme from each P450 subset (i.e., P450-Al and P450-B1). The P450-B1 cDNA was sequenced and shown to code for a P450 of 507 amino acids. Its gene has been named CYP6A2. Comparative molecular analyses of a pair of susceptible, 91-C, and resistant, 91-R, Drosophila strains were made. There was 20-30 times more P450-B1 mRNA in 91-R than in 91-C, and the small amount of P450-B1 mRNA in 91-C was significantly larger in size than that in 91-R. The P450-B1 gene in 91-R was structurally different from that in 91-C but was not amplified. The P450-BI gene in 91-C contained a solitary long terminal repeat of transposable element 17.6 in its 3' untranslated region. It was absent in the P450-B1 gene of 91-R. On the basis of features of the long terminal repeat and its location in the gene of the susceptible fly, we propose that a posttranscriptional mechanism involving mRNA stability could be involved in regulating P450-B1 gene expression. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. NR 32 TC 89 Z9 102 U1 1 U2 3 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 JUN 1 PY 1992 VL 89 IS 11 BP 4855 EP 4859 DI 10.1073/pnas.89.11.4855 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HX168 UT WOS:A1992HX16800016 PM 1317576 ER PT J AU TRUMBLE, WR SHERF, BA REASONER, JL SEWARD, PD DENOVAN, BA DOUTHART, RJ WEST, JW AF TRUMBLE, WR SHERF, BA REASONER, JL SEWARD, PD DENOVAN, BA DOUTHART, RJ WEST, JW TI PROTEIN EXPRESSION FROM AN ESCHERICHIA-COLI BACILLUS-SUBTILIS MULTIFUNCTIONAL SHUTTLE PLASMID WITH SYNTHETIC PROMOTER SEQUENCES SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article ID MESSENGER RIBONUCLEIC-ACIDS; POLYMERASE SIGMA-FACTORS; SYNTHESIS IN-VITRO; RNA-POLYMERASE; INVITRO TRANSCRIPTION; NUCLEOTIDE-SEQUENCES; CLOSTRIDIAL SYSTEM; INITIATION FACTORS; DNA-SEQUENCES; B-SUBTILIS C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP TRUMBLE, WR (reprint author), UNIV IDAHO, DEPT BACTERIOL & BIOCHEM, MOSCOW, ID 83843 USA. NR 43 TC 4 Z9 4 U1 0 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1046-5928 J9 PROTEIN EXPRES PURIF JI Protein Expr. Purif. PD JUN PY 1992 VL 3 IS 3 BP 169 EP 177 DI 10.1016/1046-5928(92)90012-L PG 9 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA HZ849 UT WOS:A1992HZ84900001 PM 1392613 ER PT J AU ANDERSON, A WOLOSCHAK, GE AF ANDERSON, A WOLOSCHAK, GE TI CELLULAR PROTOONCOGENE EXPRESSION FOLLOWING EXPOSURE OF MICE TO GAMMA-RAYS SO RADIATION RESEARCH LA English DT Article ID GENE-EXPRESSION; IONIZING-RADIATION; GROWTH; MODULATION; INDUCTION; LIVER; BETA; RNA C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 21 TC 28 Z9 28 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1992 VL 130 IS 3 BP 340 EP 344 DI 10.2307/3578379 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HX927 UT WOS:A1992HX92700009 PM 1594760 ER PT J AU WUU, CS AMOLS, HI KLIAUGA, P REINSTEIN, LE SARAF, S AF WUU, CS AMOLS, HI KLIAUGA, P REINSTEIN, LE SARAF, S TI MICRODOSIMETRY FOR BORON NEUTRON-CAPTURE THERAPY SO RADIATION RESEARCH LA English DT Article C1 COLUMBIA UNIV,CTR RADIOL RES,NEW YORK,NY 10032. SUNY STONY BROOK,DEPT RADIAT ONCOL,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP WUU, CS (reprint author), COLUMBIA UNIV,DEPT RADIAT ONCOL,NEW YORK,NY 10032, USA. NR 21 TC 36 Z9 37 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1992 VL 130 IS 3 BP 355 EP 359 DI 10.2307/3578381 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HX927 UT WOS:A1992HX92700011 PM 1594762 ER PT J AU BLAZEK, ER PEAK, JG AF BLAZEK, ER PEAK, JG TI FILTER ELUTION ASSAYS FOR DNA DAMAGE - PRACTICAL AND MECHANISTIC SIGNIFICANCE OF THE DNA IN THE FILTER SUPPORT WASH SO RADIATION RESEARCH LA English DT Note ID DOUBLE-STRAND BREAKS; ALKALINE ELUTION; MAMMALIAN-CELLS; CALIBRATION; REPAIR; DECAY; MODEL RP BLAZEK, ER (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,ARGONNE,IL 60439, USA. FU NCI NIH HHS [R01 CA37848, R01 CA34492]; NIEHS NIH HHS [T32ES07057] NR 23 TC 2 Z9 2 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1992 VL 130 IS 3 BP 384 EP 388 DI 10.2307/3578386 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA HX927 UT WOS:A1992HX92700016 PM 1594767 ER PT J AU TANG, K ALLMAN, SL CHEN, CH AF TANG, K ALLMAN, SL CHEN, CH TI MASS-SPECTROMETRY OF LASER-DESORBED OLIGONUCLEOTIDES SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID DESORPTION; MATRIX; IONIZATION; PROTEINS; ABLATION AB Various matrices were used for laser-desorption ionization of mixtures of small DNA segments. Parent negative ions of 34-mer as well as other smaller single-stranded oligomers were observed for selected organic acids and dye compounds. Both positive and negative parent ions were observed with very little fragmentation. Effects of various matrices and the potential applications to DNA sequencing are briefly discussed. C1 OAK RIDGE NATL LAB,POB 2008,MS-6378,OAK RIDGE,TN 37831. RI Allman, Steve/A-9121-2011; Tang, Kai/A-2194-2011 OI Allman, Steve/0000-0001-6538-7048; NR 27 TC 73 Z9 73 U1 1 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0951-4198 J9 RAPID COMMUN MASS SP JI Rapid Commun. Mass Spectrom. PD JUN PY 1992 VL 6 IS 6 BP 365 EP 368 DI 10.1002/rcm.1290060602 PG 4 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA HY212 UT WOS:A1992HY21200001 ER PT J AU PERL, ML AF PERL, ML TI THE TAU-LEPTON SO REPORTS ON PROGRESS IN PHYSICS LA English DT Review ID MAGNETIC-MOMENT; NU-TAU; SEMILEPTONIC DECAYS; E+E ANNIHILATION; STANDARD MODEL; RADIATIVE-CORRECTIONS; BRANCHING FRACTIONS; 2ND-CLASS CURRENTS; NEUTRINO HELICITY; EXCITED LEPTONS AB This paper reviews the present experimental knowledge of the properties of the tau lepton and the tau neutrino. The conventional theory of lepton properties and interactions is summarized; and that theory is compared with experiment. Furture directions for research in tau and tau neutrino physics are described. RP PERL, ML (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 246 TC 15 Z9 15 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0034-4885 J9 REP PROG PHYS JI Rep. Prog. Phys. PD JUN PY 1992 VL 55 IS 6 BP 653 EP 722 DI 10.1088/0034-4885/55/6/001 PG 70 WC Physics, Multidisciplinary SC Physics GA JA417 UT WOS:A1992JA41700001 ER PT J AU BREWE, DL BOULDIN, CE PEASE, DM BUDNICK, JI TAN, Z AF BREWE, DL BOULDIN, CE PEASE, DM BUDNICK, JI TAN, Z TI SILICON PHOTODIODE DETECTOR FOR A GLANCING-EMERGENCE-ANGLE EXAFS TECHNIQUE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID FLUORESCENCE EXAFS; SAMPLES AB We have constructed a silicon photodiode detector for use with a glancing-emergence-angle (GEA) geometry useful for obtaining fluorescence EXAFS spectra from thick specimens with concentrated absorbing species. We present a description of the detector and the results of tests, including dark-noise tests, EXAFS spectra from a standard sample, and a comparison to an ion chamber also in the GEA configuration. Data obtained from the two detectors are comparable in quality, making the diode detector a preferable choice for this application due to factors such as simplicity of construction and compact size. The diodes also have potential for significant further improvement in the quality of the signal due to their high quantum efficiency if the dark noise can be reduced. We present suggestions for achieving this in future generations of the detector. C1 NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899. UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269. BROOKHAVEN NATL LAB,DIV MET,UPTON,NY 11973. RP BREWE, DL (reprint author), UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269, USA. NR 5 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 JUN PY 1992 VL 63 IS 6 BP 3298 EP 3302 DI 10.1063/1.1142541 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HX692 UT WOS:A1992HX69200009 ER PT J AU BREWER, MA BROWN, IG DICKINSON, MR GALVIN, JE MACGILL, RA SALVADORI, MC AF BREWER, MA BROWN, IG DICKINSON, MR GALVIN, JE MACGILL, RA SALVADORI, MC TI SIMPLE, SAFE, AND ECONOMICAL MICROWAVE PLASMA-ASSISTED CHEMICAL VAPOR-DEPOSITION FACILITY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID DIAMOND FILMS; DISCHARGE; METHANE; CVD AB A simple and economical microwave plasma-assisted chemical vapor deposition facility has been developed and used for synthesis of diamond thin films. The system is similar to those developed by others but includes several unique features that make it particularly economical and safe, yet capable of producing high quality diamond films. A 2.45-GHz magnetron from a commercial microwave oven is used as the microwave power source. A conventional mixture of 0.2% methane in hydrogen is ionized in a bell jar reaction chamber located within a simple microwave cavity. By using a small hydrogen reservoir adjacent to the gas supply, an empty hydrogen tank can be replaced without interrupting film synthesis or causing any drift in plasma characteristics. Hence films can be deposited continuously for arbitrarily long periods while storing only a 24-h supply of explosive gases. System interlocks provide safe start-up and shut-down and allow unsupervised operation. Here we describe the electrical, microwave, and mechanical aspects of the system, and summarize the performance of the facility as used to reproducibly synthesize high quality diamond thin films. RP BREWER, MA (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Salvadori, Maria Cecilia/A-9379-2013 NR 25 TC 31 Z9 31 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 JUN PY 1992 VL 63 IS 6 BP 3389 EP 3393 DI 10.1063/1.1142557 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HX692 UT WOS:A1992HX69200025 ER PT J AU STILLMAN, AN THERN, R WITKOVER, RL AF STILLMAN, AN THERN, R WITKOVER, RL TI AN ULTRAHIGH-VACUUM BEAM PROFILE MONITOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID PERFORMANCE AB Ordinary gas ionization profile monitors, in common use at high-energy accelerators, are not useful in low density gases. Modern accelerators usually have high quality vacuum systems that maintain pressures below 10(-8) Torr. We will describe a beam profile monitor that not only operates in the range of 10(-11) Torr, but is noninvasive. Shaped electric fields sweep beam-generated ions out of a collection area onto the input face of a detector. The detector uses a dual microchannel plate to generate a gain of approximately 10(7) electrons per ion. An ultraviolet lamp provides a signal for monitoring the eventual degradation of the microchannel plate. The complete device contains a horizontal detector, a vertical detector, and a set of electrodes to nullify first-order electrostatic effects on the particle beam. Recent results from the initial use of the profile monitor are quite promising and demonstrate a new range of operation for this type of beam diagnostic device. RP STILLMAN, AN (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1992 VL 63 IS 6 BP 3412 EP 3416 DI 10.1063/1.1143744 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HX692 UT WOS:A1992HX69200028 ER PT J AU TRAVIS, CC MORRIS, JM AF TRAVIS, CC MORRIS, JM TI THE EMERGENCE OF ECOLOGICAL RISK ASSESSMENT SO RISK ANALYSIS LA English DT Editorial Material RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,OAK RIDGE,TN 37831, USA. NR 9 TC 7 Z9 16 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 167 EP 168 DI 10.1111/j.1539-6924.1992.tb00664.x PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300001 ER PT J AU BEAUCHAMP, JJ MCCARTHY, JF ROSENBLATT, DH SHUGART, LR AF BEAUCHAMP, JJ MCCARTHY, JF ROSENBLATT, DH SHUGART, LR TI STATISTICAL DESIGN FOR SAMPLING AND ANALYSIS OF ANIMAL POPULATIONS FOR CHEMICAL CONTAMINATION SO RISK ANALYSIS LA English DT Article DE BODY BURDENS; ANALYSIS DECISION; NONDETECTABLE VALUES ID WATER-QUALITY DATA; DETECTION LIMIT AB A strategy for sampling of animal tissues and a statistical approach for analyzing data on body burdens of a parent chemical and its metabolites is presented such that the data may be evaluated in relation to the detection limit(s) of the analytical techniques used and the criterion levels established for acceptable tissue concentrations. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. USA,BIOMED RES & DEV LAB,DIV HLTH EFFECTS RES,FT DETRICK,MD 21701. NR 13 TC 2 Z9 2 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 233 EP 238 DI 10.1111/j.1539-6924.1992.tb00670.x PG 6 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300007 ER PT J AU TRAVIS, CC MORRIS, JM AF TRAVIS, CC MORRIS, JM TI ON THE USE OF 0.75 AS AN INTERSPECIES SCALING FACTOR SO RISK ANALYSIS LA English DT Note ID POPULATION-DENSITY; BODY SIZE; MAMMALS RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,OAK RIDGE,TN 37831, USA. NR 14 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 311 EP 313 DI 10.1111/j.1539-6924.1992.tb00678.x PG 3 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300015 PM 1502378 ER PT J AU WHITE, RK AF WHITE, RK TI DIVIDED WE STAND - REDEFINING POLITICS, TECHNOLOGY AND SOCIAL CHOICE - SCHWARZ,M, THOMPSON,M SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 323 EP 324 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300019 ER PT J AU WHITE, RK AF WHITE, RK TI TECHNOLOGICAL RISK - LEWIS,HW SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 323 EP 323 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300018 ER PT J AU WHITE, RK AF WHITE, RK TI METHODS FOR ASSESSING EXPOSURE OF HUMAN AND NONHUMAN BIOTA (SCOPE 46, IPCS JOINT SYMPOSIA 13, SGOMSEC 5) - TARDIFF,RG, GOLDSTEIN,BD SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 324 EP 324 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300020 ER PT J AU WHITE, RK AF WHITE, RK TI NEW RISKS - ISSUES AND MANAGEMENT - COX,LA, RICCI,PF SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 324 EP 324 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300021 ER PT J AU WHITE, RK AF WHITE, RK TI RAPID GUIDE TO HAZARDOUS CHEMICALS IN THE WORKPLACE, 2ND EDITION - LEWIS,RJ SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 325 EP 325 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300023 ER PT J AU WHITE, RK AF WHITE, RK TI IMAGE - AN INTEGRATED MODEL TO ASSESS THE GREENHOUSE-EFFECT - ROTMANS,J SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 325 EP 326 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300024 ER PT J AU WHITE, RK AF WHITE, RK TI AIR-POLLUTION CONTROL AND WASTE INCINERATION FOR HOSPITALS AND OTHER MEDICAL FACILITIES - THEODORE,L SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 325 EP 325 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300022 ER PT J AU WHITE, RK AF WHITE, RK TI MAINTAINING A SATISFACTORY ENVIRONMENT - AN AGENDA FOR INTERNATIONAL ENVIRONMENTAL-POLICY - AKERMAN,N SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 326 EP 326 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300025 ER PT J AU WHITE, RK AF WHITE, RK TI MAN AND RISKS - TECHNOLOGICAL AND HUMAN RISK PREVENTION - CARNINO,A, NICOLET,JL, WANNER,JC SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 326 EP 326 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300026 ER PT J AU WHITE, RK AF WHITE, RK TI SITE UNSEEN - THE POLITICS OF SITING A NUCLEAR WASTE REPOSITORY - JACOB,G SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1992 VL 12 IS 2 BP 326 EP 326 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA JD213 UT WOS:A1992JD21300027 ER PT J AU LIU, Z LEE, TS KOTEK, TJ AF LIU, Z LEE, TS KOTEK, TJ TI MORTALITY AMONG WORKERS IN A THORIUM-PROCESSING PLANT - A 2ND FOLLOW-UP SO SCANDINAVIAN JOURNAL OF WORK ENVIRONMENT & HEALTH LA English DT Article DE CANCER; OCCUPATIONAL COHORT; POISSON REGRESSION ANALYSIS; RADIATION ID REGRESSION-MODELS; HANFORD WORKERS; RADIATION; COHORT; RISKS AB A second follow-up of mortality was carried out for workers employed in a thorium-processing plant between 1915 and 1973. The study group comprised 3796 workers (3119 men and 677 women). Of the whole group, 926 (761 men and 165 women) were deceased and 2620 (2161 men and 459 women) were still alive, while 250 (6.6%) were lost to follow-up. For the male workers, the standardized mortality ratio (SMR) for all causes of death was 1.12 with a 95% confidence interval (95% CI) of 1.05-1.21. The SMR for the male workers was also significantly increased for all cancers (SMR 1.23, 95% CI 1.04-1.43) and lung cancer (SMR 1.36, 95% CI 1.02-1.78). For the female workers, the SMR was 0.74 (95% CI 0.63-0.86) for all causes and 0.53 (95% CI 0.35-0.78) for all cancers. The results of a Poisson regression analysis showed that there was no significant effect of the selected factors on lung cancer mortality. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ENVIRONM HLTH SECT,ARGONNE,IL 60439. W ILLINOIS UNIV,DEPT MATH,MACOMB,IL. NR 35 TC 6 Z9 6 U1 0 U2 0 PU SCAND J WORK ENV HEALTH PI HELSINKI PA TOPELIUKSENKATU 41A, SF-00250 HELSINKI, FINLAND SN 0355-3140 J9 SCAND J WORK ENV HEA JI Scand. J. Work Environ. Health PD JUN PY 1992 VL 18 IS 3 BP 162 EP 168 PG 7 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA HZ558 UT WOS:A1992HZ55800003 PM 1615290 ER PT J AU FERGUSON, PA LIU, CT AF FERGUSON, PA LIU, CT TI CRACKING BEHAVIOR OF FEAL (40 AT PERCENT AL) ALLOYS DURING CUTTING OPERATIONS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ELASTIC-PLASTIC INDENTATION; INITIATION C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 12 TC 4 Z9 4 U1 0 U2 0 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 JUN 1 PY 1992 VL 26 IS 11 BP 1669 EP 1674 DI 10.1016/0956-716X(92)90531-I PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HT907 UT WOS:A1992HT90700002 ER PT J AU MIURA, S LIU, CT AF MIURA, S LIU, CT TI ENVIRONMENTAL-EFFECT ON MECHANICAL-PROPERTIES OF L12-ORDERED (FE22CO78)3V SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID HIGH-TEMPERATURE STRENGTH; LL2 ORDERED ALLOYS; BORON-DOPED NI3AL; SINGLE-CRYSTALS; HYDROGEN EMBRITTLEMENT; INTERMETALLIC COMPOUND; FRACTURE-BEHAVIOR; DUCTILITY; CO3TI; FLOW C1 TOKYO INST TECHNOL,PRECIS & INTELLIGENCE LAB,YOKOHAMA,KANAGAWA 227,JAPAN. RP MIURA, S (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 39 TC 7 Z9 7 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN 1 PY 1992 VL 26 IS 11 BP 1753 EP 1758 DI 10.1016/0956-716X(92)90547-R PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HT907 UT WOS:A1992HT90700018 ER PT J AU SPARN, G THOMPSON, JD ALLEMAND, PM LI, Q WUDL, F HOLCZER, K STEPHENS, PW AF SPARN, G THOMPSON, JD ALLEMAND, PM LI, Q WUDL, F HOLCZER, K STEPHENS, PW TI PRESSURE-DEPENDENCE OF MAGNETISM IN C60TDAE SO SOLID STATE COMMUNICATIONS LA English DT Article ID INTERMOLECULAR INTERACTIONS AB We have determined the pressure response of magnetism in C60 TDAE, where TDAE is tetrakis (dimethylamino) ethylene, and its temperature dependent susceptibility above and below the magnetic ordering temperature T(C)=16.1K. The magnetism is depressed very rapidly with applied pressure. We consider several possible interpretations for the magnetic transition and its pressure dependence and conclude that an itinerant-ferromagnet description is most likely. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,INST POLYMERS & ORGAN SOLIDS,SANTA BARBARA,CA 93106. CNRS,F-91405 ORSAY,FRANCE. SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. RI Sparn, Guenter/F-5120-2013 NR 18 TC 33 Z9 33 U1 2 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUN PY 1992 VL 82 IS 10 BP 779 EP 782 DI 10.1016/0038-1098(92)90163-4 PG 4 WC Physics, Condensed Matter SC Physics GA JA650 UT WOS:A1992JA65000007 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, DR BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, MD DALPIAZ, P DALPIAZ, PF DAMERI, M DIMITROYANNIS, D FABBRI, M FAST, JE FERRONI, S GEE, M GINSBURG, CM GOLLWITZER, KE HAHN, AA HASAN, MA HSUEH, SY LEWIS, RA LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, MA MARCHETTO, F MARINELLI, M MARQUES, JL MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, PA RAY, RE REID, JD RINAUDO, G ROSEN, JL SANTRONI, A SARMIENTO, M SAVRIE, M SCHULTZ, J SETH, KK SMITH, GA TECCHIO, L TOMMASINI, S TROKENHEIM, S WEBER, MF WERKEMA, SJ ZHANG, Y ZHAO, JL ZIOULAS, G ZITO, M AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, DR BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, MD DALPIAZ, P DALPIAZ, PF DAMERI, M DIMITROYANNIS, D FABBRI, M FAST, JE FERRONI, S GEE, M GINSBURG, CM GOLLWITZER, KE HAHN, AA HASAN, MA HSUEH, SY LEWIS, RA LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, MA MARCHETTO, F MARINELLI, M MARQUES, JL MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, PA RAY, RE REID, JD RINAUDO, G ROSEN, JL SANTRONI, A SARMIENTO, M SAVRIE, M SCHULTZ, J SETH, KK SMITH, GA TECCHIO, L TOMMASINI, S TROKENHEIM, S WEBER, MF WERKEMA, SJ ZHANG, Y ZHAO, JL ZIOULAS, G ZITO, M TI RECENT RESULTS FROM FERMILAB EXPERIMENT 760 - CHARMONIUM FORMATION BY P(P)BAR ANNIHILATION SO SOVIET JOURNAL OF NUCLEAR PHYSICS-USSR LA English DT Article ID ALUMINIZED MYLAR TUBES; CHARGE DIVISION; CHAMBER AB A unique method of spectroscopy has been successfully employed by experiment 760 at Fermilab resulting in data of unprecedented accuracy. We present a general survey of the experiment as well as the data results which are presently available from the experiment on reactions of the type ppBAR --> ccBAR. In particular, we report the first measurement of the chi-1 (P-3(1)) width and a dramatically improved measurement of the chi-2 (P-3(2)) width. C1 UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,I-44100 FERRARA,ITALY. UNIV GENOA,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60201. UNIV CALIF IRVINE,IRVINE,CA 92717. PENN STATE UNIV,UNIV PK,PA 16802. IST NAZL FIS NUCL,I-10124 TURIN,ITALY. UNIV TURIN,I-10124 TURIN,ITALY. RP ARMSTRONG, TA (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Pia, Maria Grazia/C-7034-2012; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400 NR 13 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 0038-5506 J9 SOV J NUCL PHYS+ PD JUN PY 1992 VL 55 IS 6 BP 811 EP 817 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JE988 UT WOS:A1992JE98800003 ER PT J AU LANDSBERG, GL DOWSKOW, SV INYAKIN, AV KACHANOV, VA KULIK, AV LANDSBERG, GL LEDNEV, AA POLOVNIKOV, SA PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV SUGONYAEV, VP CHIKOVANI, EG TABIDZE, MD BRICMAN, C STROOT, JP BINON, FG BENCHEIKH, B GOUANERE, M PEIGNEUX, JP POULET, M ALDE, D KNAPP, EA BOUTEMEUR, M BELLAZZINNI, R BREZ, A MASSAI, MM TORQUATI, MR INABA, S KOBAYASHI, M TAKAMATSU, K TSURU, T NAKAMURA, T AF LANDSBERG, GL DOWSKOW, SV INYAKIN, AV KACHANOV, VA KULIK, AV LANDSBERG, GL LEDNEV, AA POLOVNIKOV, SA PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV SUGONYAEV, VP CHIKOVANI, EG TABIDZE, MD BRICMAN, C STROOT, JP BINON, FG BENCHEIKH, B GOUANERE, M PEIGNEUX, JP POULET, M ALDE, D KNAPP, EA BOUTEMEUR, M BELLAZZINNI, R BREZ, A MASSAI, MM TORQUATI, MR INABA, S KOBAYASHI, M TAKAMATSU, K TSURU, T NAKAMURA, T TI GAMS RESULTS ON THE OMEGA-PI(0) SYSTEM SO SOVIET JOURNAL OF NUCLEAR PHYSICS-USSR LA English DT Article ID GEV/C-PI; MESONS; ETA AB The first results on the omega-pi-0 system produced in the charge-exchange reaction of pi--p scattering at 38 GeV/c and 100 GeV/c are presented. The omega-pi-0 mass spectrum shows, alongside with the well-known b1(0) (1235) and rho-3(0) (1690) mesons, a new neutral state with mass 2200 +/- 20 MeV and width 260 +/- 50 MeV. This meson, X(2200), is produced like rho-3 through one-pion exchange. X(2200) is a candidate for the 1-- multiplet, and its possible interpretation is a 2(3)D1 excitation of the rho-0. Its production cross section at 3 S GeV/c is equal to sigma(pi--p --> Xn) . BR (X --> omega-pi-0) = 120 +/- 25 nb. Cross sections for b1 and rho-3 have also been measured. The energy dependences have been determined. C1 TBILISI STATE UNIV,HIGH ENERGY PHYS RES INST,TBILISI,GEORGIA,USSR. INST INTERUNIV SCI NUCL,BRUSSELS,BELGIUM. UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM. LAB ANNECY LE VIEUX PHYS PARTICULES,ANNECY LE VIEUX,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV PISA,I-56100 PISA,ITALY. IST NAZL FIS NUCL,PISA,ITALY. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 30032,JAPAN. MIYAZAKI UNIV,MIYAZAKI 880,JAPAN. RP LANDSBERG, GL (reprint author), SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV,USSR. NR 21 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 0038-5506 J9 SOV J NUCL PHYS+ PD JUN PY 1992 VL 55 IS 6 BP 822 EP 826 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JE988 UT WOS:A1992JE98800005 ER PT J AU ARMSTRONG, T BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A GALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, M FAST, J FERRONI, E GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MINECHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, R PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, K SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G AF ARMSTRONG, T BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A GALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, M FAST, J FERRONI, E GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MINECHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, R PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, K SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G TI A NEW MEASUREMENT OF THE PROTON ELECTROMAGNETIC FORM-FACTOR IN THE TIME-LIKE REGION AT HIGH-ENERGY SO SOVIET JOURNAL OF NUCLEAR PHYSICS-USSR LA English DT Article AB We have determined the value of the proton electromagnetic form factor in the time-like region at -q2 = 12.6 (GeV/c)2. The events ppBAR --> e+e- from the data collected by the E760 experiment. performed at the Antiproton Accumulator Ring at Fermilab, were used. At the value of -q2, assuming the possibility of neglecting the \G(E)\ contribution to the cross section, we found \G(M) \ = 0.0015 +/- 0.003 and sigma(TOT) (ppBAR --> e+e-) = 1.9 +/- 0.8 pb. C1 IST NAZL FIS NUCL,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GENOA,I-16146 GENOA,ITALY. UNIV CALIF IRVINE,IRVINE,CA 92717. NORTHWESTERN UNIV,EVANSTON,IL 60201. PENN STATE UNIV,UNIV PK,PA 16802. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TURIN,I-10125 TURIN,ITALY. RP ARMSTRONG, T (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Luppi, Eleonora/A-4902-2015; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Luppi, Eleonora/0000-0002-1072-5633; Gianoli, Alberto/0000-0002-2456-8667 NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0038-5506 J9 SOV J NUCL PHYS+ PD JUN PY 1992 VL 55 IS 6 BP 865 EP 867 PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JE988 UT WOS:A1992JE98800014 ER PT J AU ADE, H KO, CH JOHNSON, ED ANDERSON, E AF ADE, H KO, CH JOHNSON, ED ANDERSON, E TI IMPROVED IMAGES WITH THE SCANNING PHOTOELECTRON MICROSCOPE AT THE NATIONAL SYNCHROTRON LIGHT-SOURCE SO SURFACE AND INTERFACE ANALYSIS LA English DT Article; Proceedings Paper CT EUROPEAN CONF ON APPLICATIONS OF SURFACE AND INTERFACE ANALYSIS ( ECASIA 91 ) CY OCT 14-18, 1991 CL BUDAPEST, HUNGARY SP INT UNION VACUUM SCI TECH & APPL, FEDERAT EUROPEAN CHEM SOCIETIES, WORKING PARTY ANAL CHEM, ACAD SCI HUNGARY, DEPT MATH & PHYS SCI, AMER PHYS SOC, MINIST IND HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SCIENTA INTSRUMENTS, FISONS INSTRUMENTS AB We present recent developments with the scanning photoelectron microscope at beam line X1A (X1-SPEM) at the National Synchrotron Light Source. It was the first to demonstrate elemental and chemical imaging with photoelectrons and achieve submicron resolution [Appl. Phys. Lett. 56, 1841-1843 (1990)]. Subsequent improvements allow us now to acquire XPS images with lateral resolution approaching 0.1-mu-m. We have utilized the instrument to examine artificial structures such as microelectronic devices and describe here our preliminary work in the study of photon-beam-mediated chemistry on aluminum surfaces. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. LAWRENCE BERKELEY LAB,CTR XRAY OPT,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720. RP ADE, H (reprint author), SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794, USA. RI Ade, Harald/E-7471-2011 NR 11 TC 3 Z9 3 U1 0 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JUN PY 1992 VL 19 IS 1-12 BP 17 EP 22 DI 10.1002/sia.740190107 PG 6 WC Chemistry, Physical SC Chemistry GA JD452 UT WOS:A1992JD45200004 ER PT J AU SOMORJAI, GA AF SOMORJAI, GA TI THE FRONTIERS OF SURFACE-STRUCTURE ANALYSIS SO SURFACE AND INTERFACE ANALYSIS LA English DT Article ID SINGLE-CRYSTAL SURFACES; THIOPHENE HYDRODESULFURIZATION; CATALYTIC HYDRODESULFURIZATION; TEMPERATURE-DEPENDENCE; TITANIA OVERLAYERS; CO HYDROGENATION; PLATINUM; MECHANISM; HEXANE; CHEMISORPTION AB Low-energy electrons have been used Predominantly to determine surface structure: low-energy electron diffraction (LEED) surface crystallography to identify the location of surface atoms and molecules, their site symmetry, bond distances and bond angles; and high-resolution electron energy-loss spectroscopy (HREELS) to determine the vibrational spectra of atoms and molecules at surfaces. The key findings of research using LEED and HREELS will be discussed. The new directions of research using these two techniques for studies of disordered surface layers and more complex molecules will be reviewed. Scanning tunneling microscopy (STM) and atomic force microscopy are new techniques under rapid development for surface structure determination. The combination of STM and LEED crystallography permits the quantitative validation of STM findings. Atomic spatial resolution uncovered several unexpected surface structures. The use of STM during high-pressure catalytic reactions is at the frontier of surface structure studies. Extended x-ray adsorption fine structure (EXAFS) and photoelectron diffraction have been used to study the atomic structure and coordination of clusters. Laser sum frequency generation (SFG) is employed to obtain vibrational spectra of molecules at solid/liquid and solid/solid interfaces. These techniques expand the frontiers of surface structure analysis to new types of surface and interface systems. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RP SOMORJAI, GA (reprint author), LAWRENCE BERKELEY LAB, CTR ADV MAT, DIV MAT SCI, BERKELEY, CA 94720 USA. NR 50 TC 11 Z9 11 U1 1 U2 11 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JUN PY 1992 VL 19 IS 1-12 BP 493 EP 507 DI 10.1002/sia.740190193 PG 15 WC Chemistry, Physical SC Chemistry GA JD452 UT WOS:A1992JD45200090 ER PT J AU WANG, ZL AF WANG, ZL TI ATOMIC STEP STRUCTURES ON CLEAVED ALPHA-ALUMINA (012) SURFACES SO SURFACE SCIENCE LA English DT Article ID REFLECTION ELECTRON-MICROSCOPY; TERMINATIONS; CONTRAST; RHEED; REM AB Cleaved a-alumina (012) surfaces are imaged with reflection electron microscopy (REM). A RHEED-THEED diffraction method is demonstrated for on-line determination of surface orientation. The observed defect structures on the (012) surface include vacancy-type of terraces, islands, kinks and ledges of a few atoms high, Steps of height possibly less than about 0.8 angstrom may be seen in REM images. The formation of the surface steps of different heights is described based on the atomic structure of the bulk crystal. The electron beam damage to the surface domains initially terminated with oxygen and aluminium layers, respectively. is interpreted based on the electrostatic desorption model after Auger decay. This effect is responsible for the bright-dark band-type contrast observed in REM images, and can be employed to identify the surface termination. It has been found that the REM image sensitivity is significantly improved with a field emission gun (FEG). C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 27 TC 17 Z9 17 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 JUN 1 PY 1992 VL 271 IS 3 BP 477 EP 492 DI 10.1016/0039-6028(92)90909-P PG 16 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JA639 UT WOS:A1992JA63900021 ER PT J AU NAILL, RF BELANGER, S KLINGER, A PETERSEN, E AF NAILL, RF BELANGER, S KLINGER, A PETERSEN, E TI AN ANALYSIS OF THE COST-EFFECTIVENESS OF UNITED-STATES ENERGY POLICIES TO MITIGATE GLOBAL WARMING SO SYSTEM DYNAMICS REVIEW LA English DT Article AB The issue of global warming has sparked debate among scientists and policymakers over the past two years. Many studies have been undertaken in the U.S. and other nations to determine the potential severity of global climate change and appropriate policy responses. The U.S. Department of Energy is now conducting one such study of energy technology and policy options to mitigate greenhouse gas emissions. The study attempts to assess the emissions reduction potential and costs of several policies, using the FOSSIL2 integrated energy model. This article focuses on the preliminary results of a subset of eight policy cases. It discusses the modeling methodology, the formulation of these policies, draft results, and some Policy insights. C1 US DOE,WASHINGTON,DC 20545. RP NAILL, RF (reprint author), AES CORP,1001 N 19TH ST,ARLINGTON,VA 22209, USA. NR 9 TC 31 Z9 31 U1 1 U2 5 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0883-7066 J9 SYST DYNAM REV JI Syst. Dyn. Rev. PD SUM PY 1992 VL 8 IS 2 BP 111 EP 128 DI 10.1002/sdr.4260080202 PG 18 WC Management; Social Sciences, Mathematical Methods SC Business & Economics; Mathematical Methods In Social Sciences GA JB945 UT WOS:A1992JB94500001 ER PT J AU MODELL, M LARSON, J SOBCZYNSKI, SF AF MODELL, M LARSON, J SOBCZYNSKI, SF TI SUPERCRITICAL WATER OXIDATION OF PULP-MILL SLUDGES SO TAPPI JOURNAL LA English DT Article DE CHEMICAL REACTIONS; COST EFFECTIVENESS; COSTS; DESIGN; DIOXINS; EFFLUENT TREATMENT; EFFLUENTS; HALIDES; HALOGEN COMPOUNDS; MILLS; OXIDATION; PLANT DEPARTMENTS; PULP MILLS; REPLACEMENT; SLUDGE; SLUDGE DISPOSAL; SOLID WASTES; TOTAL ORGANIC CARBON; WASTE DISPOSAL; WASTES; WATER AB Supercritical water oxidation (SCWO) is a new process that can oxidize organics very effectively at moderate temperatures (400-650-degrees-C) and high pressure (25.5 MPa). It is an environmentally acceptable alternative for sludge treatment. In bench-scale tests, total organic carbon (TOC) and halide (TOX) reductions of 99-99.9% were obtained; dioxin reductions were 95-99.9%. A conceptual design for commercial systems has been completed, and preliminary economics have been estimated. Cost comparisons confirm that SCWO is less costly than dewatering plus incineration for treating pulp mill sludges. In addition, SCWO can also compete effectively with dewatering plus landfilling where tipping fees exceed US$ 45/m3. C1 US DOE,OFF IND TECHNOL,WASHINGTON,DC 20585. RP MODELL, M (reprint author), MODELL DEV CORP,39 LORING DR,FRAMINGHAM,MA 01701, USA. NR 11 TC 31 Z9 36 U1 0 U2 8 PU TECH ASSN PULP PAPER IND INC PI NORCROSS PA 15 TECHNOLOGY PARK SOUTH, NORCROSS, GA 30092 SN 0734-1415 J9 TAPPI J JI TAPPI J. PD JUN PY 1992 VL 75 IS 6 BP 195 EP 202 PG 8 WC Materials Science, Paper & Wood SC Materials Science GA HX428 UT WOS:A1992HX42800028 ER PT J AU MCLAUGHLIN, JF ROUGHGARDEN, J AF MCLAUGHLIN, JF ROUGHGARDEN, J TI PREDATION ACROSS SPATIAL SCALES IN HETEROGENEOUS ENVIRONMENTS SO THEORETICAL POPULATION BIOLOGY LA English DT Article ID POPULATION-DYNAMICS; WAVE SOLUTIONS; EQUATIONS C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. STANFORD UNIV,DEPT BIOL SCI,STANFORD,CA 94305. NR 32 TC 29 Z9 29 U1 0 U2 7 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0040-5809 J9 THEOR POPUL BIOL JI Theor. Popul. Biol. PD JUN PY 1992 VL 41 IS 3 BP 277 EP 299 DI 10.1016/0040-5809(92)90030-W PG 23 WC Ecology; Evolutionary Biology; Genetics & Heredity SC Environmental Sciences & Ecology; Evolutionary Biology; Genetics & Heredity GA JA038 UT WOS:A1992JA03800002 ER PT J AU MILNE, BT TURNER, MG WIENS, JA JOHNSON, AR AF MILNE, BT TURNER, MG WIENS, JA JOHNSON, AR TI INTERACTIONS BETWEEN THE FRACTAL GEOMETRY OF LANDSCAPES AND ALLOMETRIC HERBIVORY SO THEORETICAL POPULATION BIOLOGY LA English DT Article ID HOME RANGE; DIVERSITY; DYNAMICS; ECOLOGY; SIZE C1 OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. COLORADO STATE UNIV, NAT RESOURCE ECOL LAB, FT COLLINS, CO 80523 USA. COLORADO STATE UNIV, DEPT BIOL, FT COLLINS, CO 80523 USA. RP UNIV NEW MEXICO, DEPT BIOL, ALBUQUERQUE, NM 87131 USA. RI Turner, Monica/B-2099-2010 NR 38 TC 54 Z9 56 U1 0 U2 5 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0040-5809 EI 1096-0325 J9 THEOR POPUL BIOL JI Theor. Popul. Biol. PD JUN PY 1992 VL 41 IS 3 BP 337 EP 353 DI 10.1016/0040-5809(92)90033-P PG 17 WC Ecology; Evolutionary Biology; Genetics & Heredity SC Environmental Sciences & Ecology; Evolutionary Biology; Genetics & Heredity GA JA038 UT WOS:A1992JA03800005 ER PT J AU NORDQVIST, AW TSANG, YW TSANG, CF DVERSTORP, B ANDERSSON, J AF NORDQVIST, AW TSANG, YW TSANG, CF DVERSTORP, B ANDERSSON, J TI A VARIABLE APERTURE FRACTURE NETWORK MODEL FOR FLOW AND TRANSPORT IN FRACTURED ROCKS SO WATER RESOURCES RESEARCH LA English DT Article ID TRACER TRANSPORT; SINGLE FRACTURE; MACROSCOPIC DISPERSION; STOCHASTIC-ANALYSIS; ANOMALOUS FEATURES; FIELD OBSERVATIONS; SOLUTE TRANSPORT; CHANNEL MODEL; CALIBRATION; VALIDATION AB A three-dimensional variable aperture fracture network model for flow and transport in fractured rocks was developed. The model generates both the network of fractures and the variable aperture distribution of individual fractures in the network. Before solving for the flow and transport of the whole network, a library of single-fracture permeabilities and particle transport residence time spectra is first established. The spatially varying aperture field within an individual fracture plane is constructed by geostatistical methods. Then the flow pattern, the fracture transmissivity, and the residence times for transport of particles through each fracture are calculated. The library of transmissivities and frequency distributions of residence times is used for all fractures in the network by a random selection procedure. The solution of flow through the fracture network and the particle-tracking calculation of solute transport for the whole network are derived from one side of the network to the other. The model thus developed can handle flow and transport from the single-fracture scale to the multiple-fracture scale. The single-fracture part of the model is consistent with earlier laboratory tests and field observations. The multiple-fracture aspect of the model was verified in the constant aperture fracture limit with an earlier code. The simulated breakthrough curves obtained from the model display dispersion on two different scales as has been reported from field experiments. C1 SWEDISH NUCL POWER INSPECTORATE,S-10252 STOCKHOLM,SWEDEN. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP NORDQVIST, AW (reprint author), ROYAL INST TECHNOL,DEPT HYDRAUL ENGN,S-10044 STOCKHOLM 70,SWEDEN. NR 31 TC 83 Z9 87 U1 1 U2 15 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 JUN PY 1992 VL 28 IS 6 BP 1703 EP 1713 DI 10.1029/92WR00216 PG 11 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA HX309 UT WOS:A1992HX30900018 ER PT J AU BRANDON, ED AF BRANDON, ED TI CHARACTERIZATION OF FOCUSING LENSES FOR CO2-LASER BEAM-WELDING SO WELDING JOURNAL LA English DT Article RP BRANDON, ED (reprint author), SANDIA NATL LABS,DIV MET PROC,ALBUQUERQUE,NM 87185, USA. NR 3 TC 1 Z9 2 U1 1 U2 1 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUN PY 1992 VL 71 IS 6 BP 55 EP 63 PG 9 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA HW985 UT WOS:A1992HW98500008 ER PT J AU WILSHIRE, HG RENEAU, SL AF WILSHIRE, HG RENEAU, SL TI GEOMORPHIC SURFACES AND UNDERLYING DEPOSITS OF THE MOHAVE MOUNTAINS PIEDMONT, LOWER COLORADO RIVER, ARIZONA SO ZEITSCHRIFT FUR GEOMORPHOLOGIE LA English DT Article ID QUATERNARY CLIMATIC CHANGES; EASTERN MOJAVE DESERT; CIMA VOLCANIC FIELD; CALIFORNIA; BASIN AB The piedmont of the Mohave Mountains, Arizona formed under conditions of relative tectonic inactivity and external drainage, with the regional base level controlled by the Colorado River. Well-developed geomorphic surfaces formed on sedimentary deposits that range from middle Miocene to Pleistocene in age, but principally on late Miocene (?)-Pleistocene fanglomerate (QTs1) of local origin. Geomorphic units younger than QTs1 generally consist of an erosional platform that may or may not be covered by contemporaneous gravel deposits (typically 1 to 2 m thick). Contemporaneous deposits are generally much coarser than Miocene(?)-Pleistocene fanglomerates on which most erosional platforms were cut, and are interpreted in part as lag gravels. The surfaces are interpreted as erosional- or pediment-terrace sequences that formed on alluvium (rather than hard bedrock) in periods of temporary base-level stability during progressive dissection of the older (QTs1) fans. In general, soils on older surfaces are better developed than those on younger surfaces, but substantial variation in the soils makes local and regional correlation uncertain. Cumulative clast-size distributions of terrace deposits and of pavements developed on the surfaces reveal no distinctive differences useful for correlation. Although climate changes may have influenced formation of the terraces, evidence for that was not found in the clast size distributions of terrace substrates. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP WILSHIRE, HG (reprint author), US GEOL SURVEY,345 MIDDLEFIELD RD MS-975,MENLO PK,CA 94025, USA. NR 42 TC 2 Z9 2 U1 0 U2 0 PU GEBRUDER BORNTRAEGER PI STUTTGART PA JOHANNESSTR 3A, D-70176 STUTTGART, GERMANY SN 0372-8854 J9 Z GEOMORPHOL JI Z. Geomorphol. PD JUN PY 1992 VL 36 IS 2 BP 207 EP 226 PG 20 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA JA057 UT WOS:A1992JA05700006 ER PT J AU ALDE, D BINON, FG BOUTEMEUR, M BRICMAN, C DONSKOV, SV GOUANERE, M INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KNAPP, EA KULIK, AV LANDSBERG, GL LEDNEV, AA PEIGNEUX, JP POLOVNIKOV, SA POULET, M PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV STROOT, JP SUGONYAEV, VP AF ALDE, D BINON, FG BOUTEMEUR, M BRICMAN, C DONSKOV, SV GOUANERE, M INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KNAPP, EA KULIK, AV LANDSBERG, GL LEDNEV, AA PEIGNEUX, JP POLOVNIKOV, SA POULET, M PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV STROOT, JP SUGONYAEV, VP TI STUDIES OF THE REACTION PI-P-]ETA'PI-0N AT 38 AND 100 GEV/C SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article AB The production of eta' pi-0 system in pi- p charge-exchange interactions at pi- momenta 38 GeV/c and 100 GeV/c has been studied. The 2-gamma and eta-pi-0-pi-0 decay modes of eta' leading to 4-gamma and 8-gamma final states respectively have been detected. No statistically significant peak is observed in the eta' pi-0 mass spectrum in the range of 1.2 GeV divided-by 2.1 GeV. An upper limit of 6 . 10(-3) has been established for the a2(0)(1320) --> eta' pi-0 branching ratio. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. INST INTERUNIV SCI NUCL,B-1050 BRUSSELS,BELGIUM. LAB ANNECY LE VIEUX PHYS PARTICULES,F-74019 ANNECY LE VIEUX,FRANCE. UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM. CERN,CH-1211 GENEVA 23,SWITZERLAND. RP ALDE, D (reprint author), INST HIGH ENERGY PHYS,PROTVINO 142284,USSR. NR 13 TC 1 Z9 1 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 JUN PY 1992 VL 54 IS 4 BP 549 EP 551 PG 3 WC Physics, Particles & Fields SC Physics GA JC285 UT WOS:A1992JC28500002 ER PT J AU ALDE, D BENCHEIKH, B BINON, FG BOUTEMEUR, M BRICMAN, C CHIKOVANI, EG DONSKOV, SV GOUANERE, M INABA, S INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KNAPP, EA KOBAYASHI, M KULIK, AV LANDSBERG, GL LEDNEV, AA NAKAMURA, T PEIGNEUX, JP POLOVNIKOV, SA POULET, M PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV STROOT, JP SUGONYAEV, VP TABIDZE, MD TAKAMATSU, K TSURU, T AF ALDE, D BENCHEIKH, B BINON, FG BOUTEMEUR, M BRICMAN, C CHIKOVANI, EG DONSKOV, SV GOUANERE, M INABA, S INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KNAPP, EA KOBAYASHI, M KULIK, AV LANDSBERG, GL LEDNEV, AA NAKAMURA, T PEIGNEUX, JP POLOVNIKOV, SA POULET, M PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV STROOT, JP SUGONYAEV, VP TABIDZE, MD TAKAMATSU, K TSURU, T TI STUDY OF THE OMEGA-PI-0 SYSTEM SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID GEV/C-PI; MESONS; ETA AB The mass spectra of the omega-pi-0 system, produced in pi- p charge-exchange reactions at 38 GeV/c and 100 GeV/c, show a new neutral state with a mass of 2200 +/- 20 MeV and a width of 260 +/- 50 MeV. Like rho-3 (1690), this meson, X (2200), is produced through one-pion-exchange. X (2200) J(PC) is likely 1--. It might be a 2 3D1 radial-orbital excitation of rho-0. Its production cross section falls with energy quadratically, in agreement with one-pion-exchange. The cross sections for b1 (1235) and rho-3 (1690) production have also been measured; their energy dependences have been determined. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. INST INTERUNIV SCI NUCL,B-1050 BRUSSELS,BELGIUM. LAB ANNECY LE VIEUX PHYS PARTICULES,F-74019 ANNECY LE VIEUX,FRANCE. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. TBILISI STATE UNIV,INST HIGH ENERGY PHYS,TBILISI,GEORGIA,USSR. UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM. MIYAZAKI UNIV,MIYAZAKI 88921,JAPAN. CERN,CH-1211 GENEVA 23,SWITZERLAND. RP ALDE, D (reprint author), INST HIGH ENERGY PHYS,PROTVINO 142284,USSR. NR 20 TC 18 Z9 18 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 JUN PY 1992 VL 54 IS 4 BP 553 EP 557 PG 5 WC Physics, Particles & Fields SC Physics GA JC285 UT WOS:A1992JC28500003 ER PT J AU ZHANG, J LAMBROPOULOS, P ZEI, D COMPTON, RN STOCKDALE, JAD AF ZHANG, J LAMBROPOULOS, P ZEI, D COMPTON, RN STOCKDALE, JAD TI RESONANTLY ENHANCED 2-PHOTON EXCITATION OF SODIUM ATOMS IN A HEAT PIPE SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article ID MULTIPHOTON IONIZATION; 1P TRANSITIONS; FIELD; GENERATION AB We report the results of a study of two-color laser excitation, omega-1 + omega-2, in dense sodium vapor where omega-1 was tuned in the vicinity of the 3P fine structure doublet and omega-2 was tuned to higher n l states. Resonant excitation by omega-2 of higher ns and nd states from one member of the 3 P doublet when omega-1 is tuned near the other is attributed to collisional excitation transfer. Anomalous dipole forbidden p-p transitions are observed when omega-2 is tuned to high n P states (greater-than-or-equal-to 20) and are believed to be DC electric field induced. Sample spectra for the processes considered are calculated and compared with experiment. C1 RIPON COLL,DEPT CHEM,RIPON,WI 54971. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,CHEM PHYS SECT,OAK RIDGE,TN 37831. UNIV CRETE,DEPT PHYS,IRAKLION,GREECE. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. HELAS INST ELECTR STRUCT & LASER,RES & TECHNOL FDN,GR-71110 IRAKLION,GREECE. RP ZHANG, J (reprint author), UNIV SO CALIF,DEPT PHYS,LOS ANGELES,CA 90089, USA. RI Lambropoulos, Peter/H-2431-2011 NR 17 TC 11 Z9 11 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD JUN PY 1992 VL 23 IS 3 BP 219 EP 225 PG 7 WC Physics, Atomic, Molecular & Chemical SC Physics GA JB933 UT WOS:A1992JB93300005 ER PT J AU GILBERT, TL AF GILBERT, TL TI WHAT CAN WE EXPECT FROM THE ECOLOGICAL SCIENCES - 2 PERSPECTIVES - WHAT IS THE ROLE OF SCIENCE IN THE DIALOG PROPOSED BY KLINK,WILLIAM SO ZYGON LA English DT Article DE ECOLOGY; ENVIRONMENT; ENVIRONMENTAL IMPACTS; MAP OF REALITY; RELIGION; SCIENCE; SCIENTIFIC MODELS; UNCERTAINTY; VISION AB Klink rejects the use of ecological models in environmental decision making because their predictions cannot be tested by rigorous scientific methods. I argue that models that cannot be tested according to the rigorous standards of the physical sciences can still be considered "scientific"; they are useful (and, in practice, used) for assessing the impacts of human actions on the environment and choosing between alternative courses of action. It is, however, important to be aware of the uncertainties and to make corrections as new data and insights become available. The interplay between (1) model-based decisions and action and (2) their consequences and subsequent corrections can be regarded as a dialogue between humans and nature (or God) in the sense proposed by Klink. Klink also claims that future actions should be informed by the larger vision of theology and should not be based on science. I suggest that science has an indispensible role. The larger vision is needed to respond to the fundamental religious question: How should I live-and why? But this question cannot be answered without first addressing the fundamental scientific question: How does the world work? I suggest that responses to the first question can be formulated as visions of a future state of existence that we feel compelled to strive to realize, and that science is necessary to provide "maps of reality" needed to realize visions. I also suggest that Christian traditions can probably provide adequate visions; the crucial need is for improving our "maps of reality." C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP GILBERT, TL (reprint author), CHICAGO CTR RELIG & SCI,1100 E 55TH ST,CHICAGO,IL 60615, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0591-2385 J9 ZYGON JI Zygon PD JUN PY 1992 VL 27 IS 2 BP 211 EP 220 DI 10.1111/j.1467-9744.1992.tb01011.x PG 10 WC Social Issues; Religion SC Social Issues; Religion GA HV835 UT WOS:A1992HV83500006 ER PT J AU KNIBLOE, JR WRIGHT, RN SIKKA, VK BALDWIN, RH HOWELL, CR AF KNIBLOE, JR WRIGHT, RN SIKKA, VK BALDWIN, RH HOWELL, CR TI ELEVATED-TEMPERATURE BEHAVIOR OF FE3AL WITH CHROMIUM ADDITIONS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID DYNAMIC RECRYSTALLIZATION; ALLOYS; FLOW AB A variety of elevated temperature testing has been performed on Fe3Al containing 2% and 5% chromium that was produced by inert gas atomization and consolidated by hot extrusion. Creep rupture tests indicate that the 5% chromium results in a slight reduction of time to rupture over the 2% chromium alloy. However, Larson-Miller plots indicate that this difference may be insignificant. Elevated temperature tensile and compressive tests have been performed, and both 2% and 5% chromium alloys exhibit wavy flow for certain strain rate-temperature regimes, which may be evidence of dynamic strain aging. Although total elongations of greater than 100% can be obtained by tensile testing at 800-degrees-C, strain rate jump tests indicate that these materials do not have strain rate sensitivity values as high as those typically found in superplastic materials. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KNIBLOE, JR (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 20 TC 24 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 382 EP 386 DI 10.1016/0921-5093(92)90224-O PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700005 ER PT J AU HENAGER, CH JACOBSON, RE BRUEMMER, SM AF HENAGER, CH JACOBSON, RE BRUEMMER, SM TI ELEVATED-TEMPERATURE MECHANICAL-PROPERTIES OF BE12NB SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID INDENTATION AB Bend strength, compression strength and fracture toughness of single-phase, vacuum hot pressed Be12Nb have been assessed at temperatures from ambient to 1200-degrees-C. Hot hardness and indentation creep behavior was also determined for both vacuum hot pressed and hot isostatically pressed Be12Nb over this same temperature range. Bend strength and fracture toughness increased with test temperature for the vacuum hot pressed Be12Nb. Bend strength increased to a maximum of 220 MPa at 1000-degrees-C, while K(IC) increased from 2.5 MPa m0.5 at 20-degrees-C to 4.5 MPa m0.5 at 1100-degrees-C. Significant plastic deformation in bending was observed only above 1100-degrees-C. These results are consistent with a tensile ductile-to-brittle-transition (DBTT) of about 1100-degrees-C, with the bend strength at temperatures below 1100-degrees-C limited by the low fracture toughness. Tests in uniaxial compression revealed that yielding occurred in the vacuum hot pressed material at temperatures above 700-degrees-C. High yield strengths (up to 1880 MPa) were measured at intermediate temperatures with a DBTT in compression between 700 and 800-degrees-C. Microhardness data indicated a DBTT of about 850-degrees-C for both the vacuum hot pressed and hot isostatically pressed Be12Nb. Vickers microhardness values for the hot isostatically pressed material were significantly greater at low temperatures, but hot isostatic pressing and vacuum hot pressing heats are comparable at temperatures greater than 800-degrees-C. Indentation creep results indicated activation energies for dislocation creep of 290 and 220 kJ mol-1 with power law creep stress exponents of 4.3 and 6.6 for the hot isostatically pressed and vacuum hot pressed beryllides respectively. This data is discussed using newly acquired information about dislocation slip in this alloy. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP HENAGER, CH (reprint author), WASHINGTON STATE UNIV, PULLMAN, WA 99164 USA. OI Henager, Chuck/0000-0002-8600-6803 NR 21 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 416 EP 421 DI 10.1016/0921-5093(92)90230-X PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700011 ER PT J AU STONER, SL OLIVER, WC MUKHERJEE, AK AF STONER, SL OLIVER, WC MUKHERJEE, AK TI SUPERPLASTICITY IN A NICKEL SILICIDE ALLOY - MICROSTRUCTURAL AND MECHANICAL CORRELATIONS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB The superplastic properties of a nickel silicide based intermetallic alloy have been investigated as a function of strain, strain rate and temperature. The evolution of the microstructure during superplasticity, including grain growth, grain refinement and cavitation, is reviewed. The relationship of the flow stress to strain and to strain rate and the activation energy of the deformation process have been established. Finally, deformation mechanisms for superplasticity in the alloy at intermediate and high strain rates are proposed. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV CALIF DAVIS, DEPT MECH AERONAUT & MAT ENGN, DAVIS, CA 95616 USA. RP STONER, SL (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, L-125, LIVERMORE, CA 94550 USA. NR 8 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 465 EP 469 DI 10.1016/0921-5093(92)90238-V PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700019 ER PT J AU YOO, MH FU, CL AF YOO, MH FU, CL TI CLEAVAGE FRACTURE OF ORDERED INTERMETALLIC ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID BEHAVIOR; AL3SC AB Fundamental aspects of cleavage fracture behavior of ordered intermetallic alloys are analyzed on the basis of first-principles total energy calculations of cleavage strength (and energy) and anisotropic elasticity modeling of crack tip slip (and twinning). Intrinsic brittleness of Al3Sc and NiAl is rationalized from the comparative analyses with Ni3Al and FeAl, respectively. The cleavage habit planes of (110) for NiAl and (100) for FeAl are correctly predicted in terms of the anisotropy of cleavage energies and elastic properties of dislocations. Boron strengthening in Ni3Al and hydrogen embrittlement in FeAl are discussed in view of the calculated results. RP YOO, MH (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. NR 45 TC 52 Z9 55 U1 0 U2 9 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 EI 1873-4936 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 470 EP 478 DI 10.1016/0921-5093(92)90239-W PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700020 ER PT J AU GIESEKE, B SIKKA, VK AF GIESEKE, B SIKKA, VK TI THE EFFECT OF CASTING TEMPERATURE ON THE FATIGUE PROPERTIES OF CAST NICKEL ALUMINIDE ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID GRAIN AB The results of high cycle fatigue tests at 650-degrees-C on several cast Ni3Al alloys are reported and compared with cast IN-713C. These alloys include IC-221M and several variations to the IC-221M composition. The effect of casting temperature is investigated using castings poured at three different temperatures spanning a 56-degrees-C range. The results show that IC-221M cast at the highest temperature has the best fatigue strength, exceeding that for IN-713C. In these alloys, crack initiation occurs at shrinkage microporosity and the effect of casting temperature on porosity is related to the observed differences in fatigue lives. RP GIESEKE, B (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 11 TC 7 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 520 EP 524 DI 10.1016/0921-5093(92)90246-W PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700027 ER PT J AU TORTORELLI, PF DEVAN, JH AF TORTORELLI, PF DEVAN, JH TI BEHAVIOR OF IRON ALUMINIDES IN OXIDIZING AND OXIDIZING SULFIDIZING ENVIRONMENTS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID OXIDATION; CHROMIUM; ALLOYS; FE3AL AB Fe3Al alloys have potential as structural materials and coatings for use in hostile environments because they form protective scales at very low oxygen partial pressures at elevated temperatures. Weight gains and parabolic rate constants were small for exposures to dry air at 800 and 900-degrees-C. Chromium additions to Fe3Al resulted in higher initial rates of oxidation in dry air at 800 and 900-degrees-C and substantially increased overall reaction rates in a very aggressive oxidizing/sulfidizing mixed gas when greater than 2 at.%. There was some evidence that an alpha-alumina layer formed during extended air exposure at 900-degrees-C. The ability to rapidly form an oxide layer appeared to limit damage caused by any loss of scale during thermal cycling. Preoxidation reduced the corrosion of Fe3Al-5%Cr in the oxidizing/sulfidizing gas, but aluminizing this alloy to form an FeAl coating appeared to be the best way to assure long-term protection in sulfidizing environments. RP TORTORELLI, PF (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Tortorelli, Peter/E-2433-2011 NR 15 TC 117 Z9 120 U1 0 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 573 EP 577 DI 10.1016/0921-5093(92)90253-W PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700034 ER PT J AU TAYLOR, TN PAFFETT, MT AF TAYLOR, TN PAFFETT, MT TI OXIDE PROPERTIES OF A GAMMA-TIAL - A SURFACE SCIENCE STUDY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB The surface properties of oxides grown on a gamma-TiAl (2 at.% Nb) have been examined using X-ray photoelectron spectroscopy and secondary ion mass spectroscopy. An oxide formed on the sample during air exposure at room temperature was thermally destabilized in ultrahigh vacuum. The heating largely decomposed the advanced titanium oxidation states to give a dominant +2 valence configuration at 600-degrees-C, while the aluminum oxide was somewhat enhanced for the same treatment. Growth of a post chemisorption oxide for various temperatures and exposure times at or below a pressure of 10(-6) Torr oxygen revealed the progressive development of titanium and aluminum oxide. At a temperature of 600-degrees-C the titanium component was greatly enhanced relative to the aluminum content in the surface region. This separation of titanium from aluminum was clearly visible in SIMS measurements. The development and thermal stability of these oxides is in agreement with the heats of formation and available valence states for the two majority components in the material. RP TAYLOR, TN (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 12 TC 18 Z9 18 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 584 EP 590 DI 10.1016/0921-5093(92)90255-Y PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700036 ER PT J AU SCHNEIBEL, JH GRAHLE, P ROSLER, J AF SCHNEIBEL, JH GRAHLE, P ROSLER, J TI MECHANICAL ALLOYING OF FEAL WITH Y2O3 SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID TENSILE; CREEP; AL AB The intermetallic B2 compound Fe-40at.%Al was mechanically alloyed in argon in a Turbula T2C mixer in order to introduce Y2O3 particles. Process parameters such as average energy per collision, powder quantity, additions of elemental powders and process control agents were explored. The milling process was followed by a variety of techniques including X-ray peak broadening. Creep tests were performed with hot isostatically pressed Fe-40at.%Al containing 2 vol.% Y2O3. At 1200 K the creep strength was improved by up to a factor 4 and a high stress exponent, characteristic of oxide dispersion strengthened materials, was found. C1 MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,W-7000 STUTTGART 1,GERMANY. RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 14 TC 40 Z9 43 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 684 EP 690 DI 10.1016/0921-5093(92)90271-2 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700052 ER PT J AU SRINIVASAN, S CHEN, SR SCHWARZ, RB AF SRINIVASAN, S CHEN, SR SCHWARZ, RB TI SYNTHESIS OF AL/AL3TI 2-PHASE ALLOYS BY MECHANICAL ALLOYING SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID INTERMETALLIC COMPOUND; COMPRESSION BEHAVIOR; AL3TI; FRACTURE AB We have mechanically alloyed mixtures of elemental powders to prepare fine-grained two-phase Al/Al3Ti powders at the compositions Al-20at.%Ti and Al-10at.%Ti. Hexane was used to prevent agglomeration of the powder during mechanical alloying. Carbon from the decomposition of the hexane was incorporated in the powder and reacted with titanium to form a fine dispersion of carbides in the final hot-pressed compact. We consolidated the mechanically alloyed powders by hot pressing. Yield strength and ductility were measured in compression. At 25-degrees-C, the compressive yield strengths were 1.25 and 0.6 GPa for the Al-20at.%Ti and Al-10at.%Ti alloys respectively. The ductility of the Al-10at.%Ti alloy exceeded 20% for 25 < T < 500-degrees-C. RP SRINIVASAN, S (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 27 TC 31 Z9 33 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 691 EP 695 DI 10.1016/0921-5093(92)90272-3 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700053 ER PT J AU RABIN, BH WRIGHT, RN KNIBLOE, JR RAMAN, RV RALE, SV AF RABIN, BH WRIGHT, RN KNIBLOE, JR RAMAN, RV RALE, SV TI REACTION PROCESSING OF IRON ALUMINIDES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB Iron aluminides (Fe3Al and Fe3Al + 2% or 5% Cr) and aluminide matrix composites (Fe3Al + 5% Cr + 10 wt.% Al2O3) were synthesized by heating elemental powder compacts to initiate an exothermic reaction. Densification was accomplished using either hot isostatic pressing or Ceracon consolidation during the exothermic reaction, as well as Ceracon consolidation of pressureless reaction sintered preforms. The microstructures and tensile properties of these materials have been characterized. It is demonstrated that reaction processed materials exhibit significantly higher strength than material fabricated by hot extrusion of prealloyed powder owing to their refined grain size. Relationships between the processing parameters and resultant microstructures and properties have been determined. The results indicate that Ceracon consolidation of preforms that have been pre-reacted at ambient pressure yields superior homogeneity compared to in situ reaction during consolidation. This processing route is preferred when alloying additions of chromium are desired for increased ductility. C1 CERACON INC,SACRAMENTO,CA 95628. RP RABIN, BH (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 7 TC 21 Z9 22 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 706 EP 711 DI 10.1016/0921-5093(92)90275-6 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700056 ER PT J AU SIKKA, VK MAVITY, JT ANDERSON, K AF SIKKA, VK MAVITY, JT ANDERSON, K TI PROCESSING OF NICKEL ALUMINIDES AND THEIR INDUSTRIAL APPLICATIONS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID BORON; NI3AL AB Ductile Ni3Al-based alloys offer unique properties. However, their use has been limited because information is lacking regarding their processing into various product forms. This paper describes the recent progress made toward melting, electroslag remelting and the processing of large-scale ingots of one of the Ni3Al-based alloys. Microstructural data are presented after various homogenization treatments. Both as-cast and homogenized samples were subjected to hot compression testing. The hot compression data for the commercial size ingot showed the same behavior as previously reported on the experimental heats. The status of industrial applications of nickel aluminide alloys is also described. C1 PRECIS ROLLED PROD INC,RENO,NV 89506. RP SIKKA, VK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 13 TC 52 Z9 56 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 712 EP 721 DI 10.1016/0921-5093(92)90276-7 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700057 ER PT J AU CASADO, JA AF CASADO, JA TI PION INTERFEROMETRY AS A PROBE OF TIME-VARYING SOURCES SO MODERN PHYSICS LETTERS A LA English DT Article AB We discuss the way in which Bose-Einstein correlations among identical pions are affected by the presence of an explicit time dependence in the pion source's space-time distribution. A particular functional form for this distribution has been assumed in order to compute both the longitudinal and transverse radii. In addition, the variations of these radii with the two pions center-of-mass rapidity is studied. RP CASADO, JA (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD MAY 30 PY 1992 VL 7 IS 16 BP 1471 EP 1484 DI 10.1142/S0217732392001142 PG 14 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA HY728 UT WOS:A1992HY72800009 ER PT J AU MURPHY, EM ZACHARA, JM SMITH, SC PHILLIPS, JL AF MURPHY, EM ZACHARA, JM SMITH, SC PHILLIPS, JL TI THE SORPTION OF HUMIC ACIDS TO MINERAL SURFACES AND THEIR ROLE IN CONTAMINANT BINDING SO SCIENCE OF THE TOTAL ENVIRONMENT LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOC : ADVANCES IN HUMIC SUBSTANCES RESEARCH CY AUG 06-10, 1990 CL NAGOYA, JAPAN SP INT HUM SUBST SOC DE HUMIC MINERAL INTERACTIONS; HYDROPHOBIC-SORPTION; HYDROPHOBIC ORGANIC COMPOUNDS ID POLYCYCLIC AROMATIC-HYDROCARBONS; ORGANIC-COMPOUNDS; ADSORPTION; SUBSTANCES; WATER; OXIDES; MECHANISM; GOETHITE; MATTER AB Humic substances dissolved in groundwater may adsorb to certain mineral surfaces, rendering hydrophilic surfaces hydrophobic and making them sorbents for hydrophobic organic compounds (HOC). The sorption of humic and fulvic acids (International Humic Substances Society, IHSS, reference samples) on hematite and kaolinite was investigated to determine how natural organic coatings influence HOC sorption. The sorption behavior of the humic substances was consistent with a ligand-exchange mechanism, and the amount of sorption depended on the concentration of hydroxylated surface sites on the mineral and the properties of the humic substance. The sorption of the humic substances to two solids was proportional to their aromatic carbon content and inversely proportional to the O/C ratio. Increasing quantities of sorbed humic substances (f(oc), 0.01-0.5%) increased the sorption of carbazole, dibenzothiophene and anthracene. Peat humic acid, the most aromatic coating, showed the greatest sorption enhancement of HOC when sorbed to hematite. In addition, HOC sorption was greater on organic coatings formed at low ionic strength (I = 0.005) as compared to higher ionic strength (I = 0.1). We suggest that both the mineral surface and the ionic strength of the electrolyte affect the interfacial configuration of the sorbed humic substance, altering the size or accessibility of hydrophobic domains on the humic molecule to HOC. RP MURPHY, EM (reprint author), PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. NR 30 TC 34 Z9 35 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0048-9697 J9 SCI TOTAL ENVIRON JI Sci. Total Environ. PD MAY 30 PY 1992 VL 118 BP 413 EP 423 PG 11 WC Environmental Sciences SC Environmental Sciences & Ecology GA HX715 UT WOS:A1992HX71500041 ER PT J AU ZHANG, BL WANG, CZ HO, KM AF ZHANG, BL WANG, CZ HO, KM TI STRUCTURES OF LARGE FULLERENES - C-60 TO C-94 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID CARBON CLUSTERS; STABILITY AB A systematic study of the structures of large carbon fullerenes ranging from C60 to C94 is performed. We first generate the topological networks for candidate structures using an efficient cage network generation scheme. The resultant networks were relaxed with tight-binding molecular dynamics to obtain the ground-state structures for various low-energy isomers. Unlike the buckminsterfullerene C60, the large carbon fullerenes prefer structures with low symmetry and several isomers can be very close in energy and may coexist in synthesis. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZHANG, BL (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 20 TC 108 Z9 114 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 29 PY 1992 VL 193 IS 4 BP 225 EP 230 DI 10.1016/0009-2614(92)85659-X PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ328 UT WOS:A1992HZ32800004 ER PT J AU BARNABAS, MV TRIFUNAC, AD AF BARNABAS, MV TRIFUNAC, AD TI ION MOLECULE REACTIONS OF TETRAMETHYLETHYLENE RADICAL CATIONS IN ZEOLITES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-SPIN-RESONANCE; SYNTHETIC ZEOLITES AB Radical cations were produced by gamma-irradiation of solutes in zeolites at 77 K. The radical cation of tetramethylethylene (TME) was examined by EPR in a variety of zeolites at different temperatures and loading. The TME monomer radical cation, the TME dimer radical cation and the neutral radical formed by proton transfer in the dimer cation were observed. The radial cation dimer-monomer aggregation is reversible at low temperatures; above almost-equal-to 110 K the neutral radical was observed. The effect of host zeolite interactions on the reactivity of tetramethylethylene radical cations in mazzite (Na-OMEGA-5) and pentasil (MFI-Na-ZSM-5 and silicalite S115) are reported. Gamma-irradiation of TME in Na-ZSM-5 and silicalite S115 gives rise to a dimer radical cation below 50 K when the concentration of TME is > 1 wt%. EPR spectra from 50 to 110 K correspond to the monomer radical cation and the neutral radical was observed above 110 K. EPR spectra observed in Na-OMEGA-5 show the co-existence of all three radical species in varying proportions at different temperatures. The differences in the zeolite interior surface topology (e.g., cage size and type of channel) are invoked to explain the observed effects on the radical cation chemistry. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 18 TC 25 Z9 25 U1 0 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 MAY 29 PY 1992 VL 193 IS 4 BP 298 EP 304 DI 10.1016/0009-2614(92)85671-V PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ328 UT WOS:A1992HZ32800016 ER PT J AU GRIEST, WH RAMSEY, RS HO, CH CALDWELL, WM AF GRIEST, WH RAMSEY, RS HO, CH CALDWELL, WM TI SUPERCRITICAL FLUID EXTRACTION OF CHEMICAL WARFARE AGENT SIMULANTS FROM SOIL SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID CHROMATOGRAPHY AB Chemical warfare agent simulants are efficiently recovered from 2-ppm spikes in 1 g of Rocky Mountain Arsenal Standard Soil using methanol-carbon dioxide (5:95) at 300 atm for 2 min at 60-degrees-C. Recoveries (n = 3) were 79 +/- 23% for dimethylmethylphosphonate, 93 +/- 14% for 2-chloroethylethyl sulfide, 92 +/- 13% for diisopropylfluorophosphate and 95 +/- 17% for diisopropylmethylphosphonate. Recoveries are higher than, but less precise than those achieved from a 5-min ultrasonic micro-scale extraction using methanol. Much less laboratory waste is generated than the current standard organic solvent extraction method (33 g of soil shaken with 100 ml of chloroform). RP GRIEST, WH (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 10 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD MAY 29 PY 1992 VL 600 IS 2 BP 273 EP 277 DI 10.1016/0021-9673(92)85558-B PG 5 WC Chemistry, Analytical SC Chemistry GA HZ267 UT WOS:A1992HZ26700016 PM 1400849 ER PT J AU RIORDAN, M AF RIORDAN, M TI THE DISCOVERY OF QUARKS SO SCIENCE LA English DT Article ID INELASTIC ELECTRON-SCATTERING; LEPTON-NUCLEON SCATTERING; E+E ANNIHILATION; CROSS-SECTIONS; PROTON SCATTERING; NARROW RESONANCE; DEUTERIUM DATA; UNIFIED THEORY; HIGH-ENERGIES; E-P AB Quarks are widely recognized today as being among the elementary particles of which matter is composed. The key evidence for their existence came from a series of inelastic electron-nucleon scattering experiments conducted between 1967 and 1973 at the Stanford Linear Accelerator Center. Other theoretical and experimental advances of the 1970s confirmed this discovery, leading to the present standard model of elementary particle physics. RP STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 82 TC 3 Z9 3 U1 0 U2 4 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD MAY 29 PY 1992 VL 256 IS 5061 BP 1287 EP 1293 DI 10.1126/science.256.5061.1287 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HW135 UT WOS:A1992HW13500024 PM 17736758 ER PT J AU FALKOWSKI, PG KIM, Y KOLBER, Z WILSON, C WIRICK, C CESS, R AF FALKOWSKI, PG KIM, Y KOLBER, Z WILSON, C WIRICK, C CESS, R TI NATURAL VERSUS ANTHROPOGENIC FACTORS AFFECTING LOW-LEVEL CLOUD ALBEDO OVER THE NORTH-ATLANTIC SO SCIENCE LA English DT Article ID RADIATION BUDGET EXPERIMENT; DIMETHYL SULFIDE; OCEAN; SEA; CLIMATE; SULFUR; COLOR AB Cloud albedo plays a key role in regulating Earth's climate. Cloud albedo depends on column-integrated liquid water content and the density of cloud condensation nuclei, which consists primarily of submicrometer-sized aerosol sulfate particles. A comparison of two independent satellite data sets suggests that, although anthropogenic sulfate emissions may enhance cloud albedo immediately adjacent to the east coast of the United States, over the central North Atlantic Ocean the variability in albedo can be largely accounted for by natural marine and atmospheric processes that probably have remained relatively constant since the beginning of the industrial revolution. C1 SUNY STONY BROOK,INST TERR & PLANETARY ATMOSPHERES,STONY BROOK,NY 11794. RP FALKOWSKI, PG (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. RI Wilson, Cara/A-8816-2009; OI Wilson, Cara/0000-0001-9318-2322 NR 20 TC 61 Z9 62 U1 1 U2 5 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 29 PY 1992 VL 256 IS 5061 BP 1311 EP 1313 DI 10.1126/science.256.5061.1311 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HW135 UT WOS:A1992HW13500030 PM 17736762 ER PT J AU FAHR, A LAUFER, AH AF FAHR, A LAUFER, AH TI THE 1,1-ELIMINATION OF HCN AND FORMATION OF TRIPLET VINYLIDENE FROM THE PHOTOLYSIS OF ACRYLONITRILE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; ACETYLENE; H2CC(3B2); RADICALS AB The single-photon photodissociation of acrylonitrile-1-d has been investigated by flash photolysis and kinetic absorption spectroscopy in the vacuum-ultraviolet region. Both electronically excited triplet vinylidene and DCN were observed. The result provides further evidence that a "vinylidene" type structure with an extended lifetime exists. Alternative primary processes were considered, particularly those involving vinyl radical or molecular acetylene formation, but they were not observed. C1 US DOE,OFF BASIC ENERGY SCI,DIV CHEM SCI,WASHINGTON,DC 20585. RP FAHR, A (reprint author), NATL INST STAND & TECHNOL,DIV CHEM KINET,GAITHERSBURG,MD 20899, USA. NR 20 TC 18 Z9 18 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 28 PY 1992 VL 96 IS 11 BP 4217 EP 4219 DI 10.1021/j100190a022 PG 3 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800022 ER PT J AU HESS, AC SAUNDERS, VR AF HESS, AC SAUNDERS, VR TI PERIODIC ABINITIO HARTREE-FOCK CALCULATIONS OF THE LOW-SYMMETRY MINERAL KAOLINITE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ATOM POSITIONS AB Periodic ab initio Hartree-Fock LCAO calculations have been carried out on the P1 symmetry clay mineral kaolinite, Al2Si2O9H4 using STO-3G and modified 6-21G basis sets. The three structural degrees of freedom associated with the inner hydrogen atom of this compound have been optimized using the STO-3G basis. The equilibrium position of the inner hydrogen (described relative to the adjoining O-H bond) is predicted to be approximately parallel to the (ab) plane (forming an angle of +3.1-degrees) with an O-H bond length of 0.99 angstrom and the two Al-O-H angles of 107.7-degrees and 107.4-degrees, respectively. The physical properties of the system were obtained using the 6-21G basis at the geometry deduced from the STO-3G calculations. The total valence density of states has been computed. Projected densities of states have been evaluated for the chemically distinct sets of elements. It is found that the majority of the valence states are composed of oxygen 2s and 2p atomic orbitals with overlap from Si and Al 3s and 3p atomic orbitals. Crystal charge densities and density deformation maps have been computed in the basal plane of the silicate ring system. The calculations have revealed small charge densities in the center of the ditrigonal cavity (10(-4)-10(-5) e/bohr3) and an oblate distortion of the oxygen charge density directed toward the center of the ring system. The formal charges resulting from a Mulliken population analysis of the 6-21G data give the following: Si = +2.5 \e\, O = -1.7 \e\, Al = +2.1 \e\, and H = +0.56 \e\. Electrostatic potential maps have been computed in the chemically accessible regions of the structure near the ditrigonal cavities. These maps indicate that the center of the cavity is at a negative potential relative to nearby silicon positions. Analogous calculations have been carried out perpendicular to the layers of the material. The results of these calculations reveal extensive interlayer hydrogen bonding. C1 SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. RP HESS, AC (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 21 TC 113 Z9 115 U1 0 U2 9 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 MAY 28 PY 1992 VL 96 IS 11 BP 4367 EP 4374 DI 10.1021/j100190a047 PG 8 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800047 ER PT J AU SILVESTER, EJ GRIESER, F MEISEL, D HEALY, TW SULLIVAN, JC AF SILVESTER, EJ GRIESER, F MEISEL, D HEALY, TW SULLIVAN, JC TI OXIDATION-KINETICS OF ULTRASMALL COLLOIDAL CHALCOPYRITE (CUFES2) WITH ONE-ELECTRON OXIDANTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CADMIUM-SULFIDE; PULSE-RADIOLYSIS; CDS; PARTICLES AB The stopped flow technique has been used to study the oxidation of ultrasmall colloidal chalcopyrite (CuFeS2) particles (diameter 50-90 angstrom) by the one-electron oxidants hexacyanoferrate(III) (Fe(CN)6(3-)) and hexachloroiridate(IV) (IrCl6(2-)) in aqueous solution. The stoichiometry of the initial oxidation step corresponds to the reaction CuFeS2(s) + 5H2O --> Cu(OH)2(s) + Fe(OH)3(s) + 2S0(s) + 5H+ + 5e-. Further oxidation of the elemental sulfur results in the formation of S2O3(2-) and SO4(2-) in solution, as determined by ion chromatography. Time-resolved measurement of both the oxidant and chalcopyrite concentrations has provided a detailed understanding of the mechanism involved in the oxidation of colloidal chalcopyrite. C1 UNIV MELBOURNE,SCH CHEM,PARKVILLE,VIC 3052,AUSTRALIA. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 31 TC 6 Z9 6 U1 1 U2 5 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 MAY 28 PY 1992 VL 96 IS 11 BP 4382 EP 4388 DI 10.1021/j100190a049 PG 7 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800049 ER PT J AU FU, SS SOMORJAI, GA AF FU, SS SOMORJAI, GA TI ROLES OF CHEMISORBED OXYGEN AND ZINC-OXIDE ISLANDS ON CU(110) SURFACES FOR METHANOL DECOMPOSITION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SUPPORTED COPPER-CATALYSTS; FORMIC-ACID; ZNO; ADSORPTION; DESORPTION; FORMALDEHYDE; MECHANISM; KINETICS; POLAR AB The interaction of methanol with Cu-Zn-O surfaces is studied on a model system produced by depositing zinc oxide islands on Cu(110) surfaces. Various amounts of oxygen are then adsorbed onto the exposed copper part of the surface to form ZnOx/y ML O/Cu(110) surfaces. The role of O/Cu(110) in methanol decomposition on our model Cu-Zn-O surfaces was discerned by examining the interaction of methanol, adsorbed at 150 K in ultrahigh vacuum, with these ZnOx/y ML O/Cu(110) surfaces using temperature-programmed desorption (TPD), low energy electron diffraction (LEED), and Auger electron spectroscopy (AES). Methanol reduces the zinc oxide and removes oxygen chemisorbed on copper. The decomposition temperatures of formate and methoxy species formed upon methanol decomposition on the components of oxygen covered Cu(110) and ZnOx are unaffected by the presence of the other component. However, the amount of formate species decomposed on the ZnOx component of ZnOx/O/Cu(110) surfaces is controlled by the amount of chemisorbed oxygen on copper. We show that there are cooperative effects between O/Cu and ZnO which increases the total amount of formate formed; for ZnOx/0.2 ML O/Cu(110) surfaces, the concentration of surface formate doubles on the three-component system as compared to the sum of the concentration of formate species on the separate components. This produces a change in the relative surface formate to methoxy ratio from 1:9, for the case of 0.2 ML O/Cu(110), to 1:3, for the case of ZnOx/0.2 ML O/Cu(110) surfaces. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. NR 20 TC 46 Z9 46 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 28 PY 1992 VL 96 IS 11 BP 4542 EP 4549 DI 10.1021/j100190a076 PG 8 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800076 ER PT J AU HUNTLEY, DR AF HUNTLEY, DR TI THE MECHANISM OF THE DESULFURIZATION OF BENZENETHIOL BY NI(110) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MO(110); SPECTRA; DECOMPOSITION; METHANETHIOL; ADSORBATES; THIOLATE; SURFACES; ENERGIES; PT(111); OXYGEN AB The mechanism of desulfurization of benzenethiol on the Ni(110) surface was examined using temperature-programmed reaction, deuterium labeling, XPS, and HREELS. The reaction product distribution is coverage dependent, with molecular hydrogen being the only desorbed product at low coverage. Carbon-sulfur bond scission occurs at 100 K at low coverage, although the aromatic ring remains intact. At high coverage, a phenyl thiolate intermediate is formed at 100 K which gives benzene as the primary reaction product near 200 K. At high coverage, benzene formation accounts for 75% of the adsorbed benzenethiol. The desorption and spectroscopic data are most consistent with a hydrogenolysis mechanism, where both carbon-sulfur bond scission and hydrogen addition occur in the rate-limiting step at high coverage. The maximum coverage of sulfur obtained from benzenethiol is 20% less than from H2S adsorption due to steric crowding of the aromatic rings. The intensity of certain vibrational modes suggests that the aromatic ring is tilted away from the surface in the phenyl thiolate intermediate. RP HUNTLEY, DR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 26 TC 38 Z9 38 U1 1 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 MAY 28 PY 1992 VL 96 IS 11 BP 4550 EP 4558 DI 10.1021/j100190a077 PG 9 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800077 ER PT J AU ONSTOTT, EI AF ONSTOTT, EI TI 2ND LAW ASSESSMENT OF BEHAVIOR DIFFERENCES IN FORMATION OF SEVERAL SULFUR-OXYGEN COMPOUNDS OF LANTHANUM, CERIUM, AND PRASEODYMIUM SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID RECYCLE REAGENT; DIOXIDE; DIOXYMONOSULFATE; CYCLE; OXIDE AB Normalized experimental data for disproportionation and concomitant I2(g) oxidation of SO(3)2-(cr) at 675-775 K in dehydrated Ce2(SO3)2SO4.4H2O(cr), admixed with CeO2(cr) substrate, were used to evaluate chronological changes and differences in Gibbs energy, enthalpy, and entropy of formation for several product compounds. Several sequential reactions not observed previously were quantified. Intracrystal disproportionation of 2Ce2(SO3)2SO4(cr) by reaction with CeO2(cr) at 675-715 K to yield CeO(SO4)(cr) + Ce2O(SO4)SO4(cr) + Ce2O(S2O3)SO4(cr) was demonstrated. The labile S2O3(2-)(cr) reacted at higher T with I2(g) + H2O(g) to yield SO4(2-)(cr) + 2HI(g) + 1/2S2(g). At 605-690 K in the short time of 0.2 min, partially dehydrated La2(SO3)2SO4(cr) disproportionated to yield SO4(2-)(cr) + 1/2SO2(g) + 1/4S2(g) that were absorbed by the La2O2SO4(cr) substrate to yield a second solid product of 1/2La2O(S2O3)SO4(cr) by S2(g) oxidation of SO2(g). At 660-800 K the only solid product of disproportionation and I2(g) oxidation and hydrolysis of dehydrated Pr2(SO3)2SO4.4H2O(cr) was Pr2O(SO4)SO4(cr). Formation of S2O3(2-)(cr) was not observed and was not prominent because of a better fit of SO4(2-) in the solids to match the smallest Pr3+ cation. This behavior is an effect of the lanthanide contraction. The best crystal fit of S2O3(2-) for the pair of La3+ and Ce3+ seemed to be in Ce2O(S2O3)SO4(cr), with O2-(cr) being better accommodated in the available space. RP ONSTOTT, EI (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 11 TC 1 Z9 1 U1 0 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 MAY 28 PY 1992 VL 96 IS 11 BP 4620 EP 4626 DI 10.1021/j100190a088 PG 7 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800088 ER PT J AU BECK, WF SAUER, K AF BECK, WF SAUER, K TI ENERGY-TRANSFER AND EXCITON-STATE RELAXATION PROCESSES IN ALLOPHYCOCYANIN SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BACTERIOCHLOROPHYLL-A-PROTEIN; CYANOBACTERIUM MASTIGOCLADUS-LAMINOSUS; PHOTOSYNTHETIC REACTION CENTER; AMINO-ACID-SEQUENCE; C-PHYCOCYANIN; PROSTHECOCHLORIS-AESTUARII; RHODOPSEUDOMONAS-VIRIDIS; AGMENELLUM-QUADRUPLICATUM; TRANSITION DIPOLE; 3A RESOLUTION AB We have employed picosecond spectroscopic techniques to characterize the photophysics of the phycocyanobilin chromophores in linker-free allophycocyanin isolated from the cyanobacterium Synechococcus PCC 6301 (AN112 mutant). In analogy with the known structure of the related phycobiliprotein C-phycocyanin, allophycocyanin is probably organized as a ringlike homotrimer; the monomeric units are composed of an alpha and a beta-subunit, each of which binds a phycocyanobilin chromophore via a thioether linkage to a cysteine residue at amino acid position 84. We observe bidirectional excitation transfer in the alpha-beta monomer between the alpha-84 and beta-84 chromophores with a 140-ps time constant. Absorption anisotropy measurements show that the transition dipole moments of the alpha-84 and beta-84 chromophores are tilted 13 +/- 9-degrees apart in alpha-beta monomers. In (alpha-beta)3 trimers, however, the alpha-84 and beta-84 chromophores in adjacent alpha-beta monomers are brought close together, forming strong chromophore-chromophore interactions across the intermonomer interface. We interpret the observed photophysics using a model consisting of exciton levels formed by mixing of the monomeric singlet-state levels of the alpha-84 and beta-84 chromophores in the (alpha-beta)3 trimers; a system of three symmetry-equivalent but well separated chromophore dimers is formed, which produces a pair of triply degenerate singlet exciton states. We assign an ultrafast (< 2-ps time constant) anisotropy and photobleaching transient observed only in (alpha-beta)3 trimers to an interexciton level transition; the transient occurs with a polarization change that is consistent with a transition between the orthogonal upper and lower exciton states. The upper exciton state also relaxes directly to the ground state through a decay process with a 45-ps time constant. We attribute the heterogeneous relaxation of the upper exciton state through these two paths to an inhomogeneous broadening due to site heterogeneity, which was previously observed in C-phycocyanin in hole-burning experiments at low temperature (Kohler et al. Chem. Phys. Lett. 1988, 143, 169). Excited-state absorption, originating from the lower exciton state, is assigned to a transition yielding a doubly-excited exciton state (van Amerongen; Struve, J. Phys. Chem. 1991, 95, 9020). Excitation transfer among the degenerate lower exciton states is detected in terms of a 70-ps anisotropy decay observed in the photobleaching and stimulated emission. The interexciton level transition rapidly concentrates excitation in the lower exciton state of allophycocyanin (alpha-beta)3 trimers; this kind of spectral relaxation process may be important in facilitating directional excitation transfer in reaction center/light-harvesting protein assemblies. C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. NR 47 TC 51 Z9 51 U1 1 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 MAY 28 PY 1992 VL 96 IS 11 BP 4658 EP 4666 DI 10.1021/j100190a094 PG 9 WC Chemistry, Physical SC Chemistry GA HX268 UT WOS:A1992HX26800094 ER PT J AU NORBY, RJ GUNDERSON, CA WULLSCHLEGER, SD ONEILL, EG MCCRACKEN, MK AF NORBY, RJ GUNDERSON, CA WULLSCHLEGER, SD ONEILL, EG MCCRACKEN, MK TI PRODUCTIVITY AND COMPENSATORY RESPONSES OF YELLOW-POPLAR TREES IN ELEVATED CO2 SO NATURE LA English DT Article AB INCREASED forest growth in response to globally rising CO2 concentrations could provide an additional sink for the excess carbon added to the atmosphere from fossil fuels 1,2. The response of trees to increased CO2, however, can be expected to be modified by the interactions of other environmental resources and stresses, higher-order ecological interactions and internal feedbacks inherent in the growth of large, perennial organisms 3,4. To test whether short-term stimulation of tree growth by elevated CO2 can be sustained without inputs from other environmental resources, we grew yellow-poplar (Liriodendron tulipifera L.) saplings for most of three growing seasons with continuous exposure to ambient or elevated concentrations of atmospheric CO2. Despite a sustained increase in leaf-level photosynthesis and lower rates of foliar respiration in CO2-enriched trees, whole-plant carbon storage did not increase. The absence of a significant growth response is explained by changes in carbon allocation patterns, specifically a relative decrease in leaf production and an increase in fine root production. Although these compensatory responses reduced the potential increase in carbon storage in increased CO2 concentrations, they also favour the efficient use of resources over the longer term. RP NORBY, RJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Wullschleger, Stan/B-8297-2012; Norby, Richard/C-1773-2012 OI Wullschleger, Stan/0000-0002-9869-0446; Norby, Richard/0000-0002-0238-9828 NR 9 TC 272 Z9 277 U1 1 U2 38 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 28 PY 1992 VL 357 IS 6376 BP 322 EP 324 DI 10.1038/357322a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HW132 UT WOS:A1992HW13200045 ER PT J AU THOENNESSEN, M BEENE Jr BERTRAND, FE BAKTASH, C HALBERT, ML HOREN, DJ HENSLEY, DC SARANTITES, DG SPANG, W STRACENER, DW VARNER, RL AF THOENNESSEN, M BEENE, JR BERTRAND, FE BAKTASH, C HALBERT, ML HOREN, DJ HENSLEY, DC SARANTITES, DG SPANG, W STRACENER, DW VARNER, RL TI LARGE DEFORMATION IN A-SIMILAR-TO-170 NUCLEI AT HIGH-EXCITATION ENERGIES SO PHYSICS LETTERS B LA English DT Article ID GIANT-DIPOLE-RESONANCE; HOT ROTATING NUCLEI; GAMMA-RAYS; SYSTEM; FUSION; MODEL AB The gamma-ray decay of the giant dipole resonance was measured in coincidence with fission fragments following the fusion reaction O-16+Tb-159 forming Ta-175 at 123.4 MeV excitation energy. A large splitting of the giant dipole resonance (GDR) energies in the compound system was observed corresponding to a large deformation of beta=0.55. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH 1, GERMANY. WASHINGTON UNIV, ST LOUIS, MO 63130 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 19 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 28 PY 1992 VL 282 IS 3-4 BP 288 EP 292 DI 10.1016/0370-2693(92)90640-P PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HY684 UT WOS:A1992HY68400006 ER PT J AU WANG, XN GYULASSY, M AF WANG, XN GYULASSY, M TI TRANSVERSE FLOW DUE TO MINIJETS IN P(P)BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; NUCLEUS-NUCLEUS COLLISIONS; INELASTIC CROSS-SECTION; LOW-PT JETS; S = 630; E+E-PHYSICS; PSEUDORAPIDITY DISTRIBUTIONS; MULTIPLICITY DISTRIBUTION; MOMENTUM DISTRIBUTIONS; FRAGMENTATION MODEL AB The multiplicity and flavor dependence of average transverse momentum of charged particles produced in high energy pp and ppBAR collisions is studied in a PQCD inspired model. The experimentally observed transverse flow effect at square-root s=1.8 TeV is naturally explained in the context of the fragmentation of multiple minijets which dominate the hadronic interaction mechanism at high collider energies. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP WANG, XN (reprint author), DUKE UNIV,DEPT PHYS,DURHAM,NC 27706, USA. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 40 TC 27 Z9 27 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 MAY 28 PY 1992 VL 282 IS 3-4 BP 466 EP 470 DI 10.1016/0370-2693(92)90670-Y PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HY684 UT WOS:A1992HY68400036 ER PT J AU WHITLOW, LW RIORDAN, EM DASU, S ROCK, S BODEK, A AF WHITLOW, LW RIORDAN, EM DASU, S ROCK, S BODEK, A TI PRECISE MEASUREMENTS OF THE PROTON AND DEUTERON STRUCTURE FUNCTIONS FROM A GLOBAL ANALYSIS OF THE SLAC DEEP INELASTIC ELECTRON-SCATTERING CROSS-SECTIONS SO PHYSICS LETTERS B LA English DT Article ID HIGH STATISTICS MEASUREMENT; MUON SCATTERING; HIGH Q2; L/SIGMA-T; E-P; HYDROGEN; ENERGIES; NEUTRON; F2 AB We report new values of the proton and deuteron structure functions F2(x, Q2) based on a global analysis of eight SLAC experiments on deep inelastic e-p and e-d scattering. These functions were determined over the entire SLAC kinematic range: 0.06 less-than-or-equal-to x less-than-or-equal-to 0.9 and 0.6 less-than-or-equal-to Q2 less-than-or-equal-to 30.0 (GeV/c)2. The data are compared with high-Q2 measurements of F2(x, Q2) made in deep inelastic mu-p and mu-d scattering experiments at CERN. New results for the ratio F2n/F2p are also reported. C1 AMERICAN UNIV,WASHINGTON,DC 20016. UNIV ROCHESTER,ROCHESTER,NY 14627. RP WHITLOW, LW (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 44 TC 322 Z9 324 U1 1 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 MAY 28 PY 1992 VL 282 IS 3-4 BP 475 EP 482 DI 10.1016/0370-2693(92)90672-Q PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HY684 UT WOS:A1992HY68400038 ER PT J AU FAZLURRAHMAN, AK VERKADE, JG AF FAZLURRAHMAN, AK VERKADE, JG TI REACTIONS OF [PT(DIEN)CL]CL AND [PT(TRPY)CL]CL WITH THIOLS, THIOETHERS, AND DIALKYL DISULFIDES - A PT-195 NMR-STUDY SO INORGANIC CHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; TRANSITION-METAL; CYTOCHROMES-C; COMPLEXES; PLATINUM(II); PROTEINS; SULFUR; COORDINATION; CHROMOPHORE; LIGANDS AB The reactions of monofunctional platinum compounds [Pt(dien)Cl]Cl (dien = 1,5-diamino-3-azapentane) and [Pt(trpy)Cl]Cl (trpy = 2,2',2"-terpyridine) with thiols (RSH), thioethers (RSR), and disulfides (RSSR) have been investigated by H-1, C-13, and Pt-195 NMR spectroscopy. Empirical trends in Pt-195 NMR chemical shifts are noted in terms of the classes sulfur functional groups coordinated to platinum. It appears that neither the steric bulk nor the electronic character of the alkyl group makes a significant contribution to the Pt-195 nuclear shielding. Reactions of dialkyl disulfides with [Pt(dien)Cl]Cl initially lead to a monodentate complex [Pt(dien)(RSSR)]2+ which be isolated as the ClO4- or PF6- salts. In the presence of [Pt(dien)Cl]Cl, the monodentate disulfido complex undergoes further reaction to cleave the S-S bond in the disulfide ligand, via a redox process. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 46 TC 24 Z9 24 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 MAY 27 PY 1992 VL 31 IS 11 BP 2064 EP 2069 DI 10.1021/ic00037a016 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600016 ER PT J AU FUJITA, E MILDER, SJ BRUNSCHWIG, BS AF FUJITA, E MILDER, SJ BRUNSCHWIG, BS TI PHOTOPHYSICAL PROPERTIES OF COVALENTLY ATTACHED RU(BPY)3(2+) AND MCYCLAM(2+) (M = NI, H2) COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID EXCITED-STATE PROPERTIES; TRANSITION-METAL COMPLEXES; TRIS-CHELATE COMPLEXES; CARBON-DIOXIDE; TEMPERATURE-DEPENDENCE; TRIS(2,2'-BIPYRIDYL)RUTHENIUM(II) ION; RU(BPY)2(I-BIQ)2+ LUMINESCENCE; ELECTROCATALYTIC REDUCTION; PHOTOCHEMICAL REDUCTION; RUTHENIUM COMPLEXES AB Absorption and emission spectra, emission quantum yields, and excited-state lifetimes of the metal-to-ligand charge-transfer (MLCT) excited state(s) of Ru(bpy)2(6-Mebpy)2+, Ru(bpy)2(bpy-cyclamH2)4+, and Ru(bpy)2(bpy-cyclamNi)4+ are reported. The absorption and emission spectra of these complexes are similar to those of Ru(bpy)3(2+) in H2O at room temperature except for small shifts in the maxima. The emission lifetime decreases by a factor of about 80 for 6-Mebpy, and the emission quantum yield decreases by a factor of about 300 for the bpy-cyclam pendant complexes as compared to the parent Ru(bpy)3(2+) complex at 25-degrees-C. Decay of the 3MLCT excited state takes place by two independent channels: a temperature-independent pathway to the ground state and a thermally-activated pathway via a ligand-field excited state. Activation free energies, E(a), for the latter pathway were obtained from fits of the temperature-dependent emission lifetime measurements. Smaller E(a) were observed for the 6-substituted complexes (1500-2300 cm-1) relative to Ru(bpy)3(2+) (3000-3910 cm-1) in EtOH and CH3CN, indicating that either the energy difference decreases and/or the reorganization parameter changes between the emissive 3MLCT and the ligand-field state to which it is strongly coupled. The smaller E(a) can be attributed to the increased Ru-N bond distance in the 6-substituted complexes caused by steric hindrance that decreases the ligand-field strength and lowers the energy and/or reorganization parameter of the ligand-field excited state. For the bpy-cyclamNi2+ pendant complex, an energy-transfer pathway may also provide a deactivation channel. RP FUJITA, E (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Brunschwig, Bruce/G-4249-2011; Fujita, Etsuko/D-8814-2013 NR 57 TC 38 Z9 38 U1 2 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 27 PY 1992 VL 31 IS 11 BP 2079 EP 2085 DI 10.1021/ic00037a019 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600019 ER PT J AU SPARKS, LD SCHEIDT, WR SHELNUTT, JA AF SPARKS, LD SCHEIDT, WR SHELNUTT, JA TI EFFECTS OF PI-PI INTERACTIONS ON MOLECULAR-STRUCTURE AND RESONANCE RAMAN-SPECTRA OF CRYSTALLINE COPPER(II) OCTAETHYLPORPHYRIN SO INORGANIC CHEMISTRY LA English DT Article ID N-15 SUBSTITUTED DERIVATIVES; PORPHYRIN FORCE-FIELD; AQUEOUS-SOLUTION; NICKEL OCTAETHYLPORPHYRIN; DIFFERENCE SPECTROSCOPY; AROMATIC ACCEPTORS; HEME PROTEINS; SPIN STATE; METALLOPORPHYRINS; UROPORPHYRIN AB Single-crystal resonance Raman measurements were performed on two crystalline phases of copper(II) octaethylporphyrin (CuOEP): triclinic B and triclinic B forms. These are compared to previously acquired resonance Raman data on the triclinic A and triclinic B phases of nickel(II) octaethylporphyrin (NiOEP). The difference in crystal packing between the triclinic A and B structures allows for more extensive pi-pi-interactions in the B form than in the A form. Differences in the single-crystal Raman spectra of the triclinic A and B forms of both Cu- and NiOEP are attributed to these pi-pi-interactions. Specifically, the Raman core-size marker lines, nu(3), nu(2), and nu(10), and the oxidation-state marker line nu(4), are affected by the different packing interactions in the two crystals, and the same Raman shifting patterns between the triclinic A and B phases are observed for both Cu- and NiOEP. The metal centers exert a slight influence over the packing-induced frequency shifts in the Raman modes. Spectral results on the CuOEP crystals are also compared to solution Raman data on pi-pi-aggregated and monomeric copper(II) uroporphyrin (CuUroP). Similar to the A and B forms of NiOEP, the CuOEP triclinic A and B crystalline phases mimic the monomer and salt-induced aggregate of CuUroP in solution, as evidenced by similar magnitude upshifts in the Raman modes upon aggregation. A comparison of the structure calculated using molecular mechanics and the structure obtained from X-ray diffraction gives some insight into the effect that pi-pi-interactions have on the structure of CuOEP in the triclinic B crystal. C1 UNIV NOTRE DAME,DEPT CHEM & BIOCHEM,NOTRE DAME,IN 46556. SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 29 TC 22 Z9 22 U1 1 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 MAY 27 PY 1992 VL 31 IS 11 BP 2191 EP 2196 DI 10.1021/ic00037a037 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600037 ER PT J AU SCHINDLER, S SZALDA, DJ CREUTZ, C AF SCHINDLER, S SZALDA, DJ CREUTZ, C TI SYNTHESES, STRUCTURES, AND PROPERTIES OF COPPER(II) AND COPPER(I) COMPLEXES OF THE NEW BINUCLEATING LIGAND 1,3-BIS[BIS(2-PYRIDYLMETHYL)AMINO]BENZENE SO INORGANIC CHEMISTRY LA English DT Article ID X-RAY STRUCTURE; CRYSTAL-STRUCTURE; ELECTROCHEMICAL PROPERTIES; MEDIATED HYDROXYLATION; HEMOCYANIN DERIVATIVES; DICOPPER(II) CENTER; MAGNETIC-PROPERTIES; DIOXYGEN CHEMISTRY; REVERSIBLE BINDING; REACTIVITY TYPES AB The synthesis and characterization of the new copper complexes Cu2L'2(H2O)2(ClO4)4.2H2O (VI), Cu2L(H2O)2(ClO4)4.4H2O (VII), Cu2L(CH3CN)(PF6)2 (VIII), and Cu2L(CO)2(PF6)2 (IX) (L = 1,3-bis[bis(2-pyridylmethyl)amino]benzene, L' = 1-[bis(2-pyridylmethyl)amino]-3-[(2-pyridylmethyl)amino]benzene) are described. The crystal structures of the copper complexes were determined. Crystal data: complex VI, formula Cu2Cl4O20N10C48H54, triclinic space group P1BAR, Z = 1, a = 11.871 (4) angstrom, b = 12.313 (7) angstrom, c = 10.441 (14) angstrom, alpha = 108.45 (9)-degrees, beta = 102.98 (8)-degrees, gamma = 91.23 (4)-degrees; complex VII, formula Cu2Cl4O22N6C30H40, orthorhombic space group, Pmn2(1), Z = 2, a = 23.554 (3) angstrom, b = 8.998 (2) angstrom, c = 9.863 (2) angstrom. The copper(II) ions in VII are bridged by a perchlorate ion in the solid state. Complex VIII of formula Cu2P2F12N7C32H31 crystallizes in the triclinic space group P1BAR with Z = 2, a = 11.341 (2) angstrom, b = 17.421 (4) angstrom, c = 9.977 (2) angstrom, alpha = 93.98 (2)-degrees, beta = 106.89 (1)-degrees, and gamma = 91.47 (2)-degrees. The two copper(I) ions in VIII are in different environments because acetonitrile is bound to only one copper site. Complex IX of formula Cu2P2F12O2N6C32H28 crystallizes in the triclinic space group P1BAR with Z = 2, a = 13.465 (2) angstrom, b = 15.763 (2) angstrom, c = 9.9839 (9) angstrom, alpha = 94.07 (1)-degrees, beta = 101.46 (1)-degrees, and gamma = 113.41 (1)-degrees. The dicarbonyl complex IX is formed from the addition of two molecules of carbon monoxide to VIII. The binding constant for this reaction, measured at 22 +/- 2-degrees-C in dimethylformamide by cyclic voltammetry, is 2.1 x 10(8) M-2 per copper(I) dimer. Cyclic voltammetry and differential pulse voltammetry show that the redox potentials for Cu(II)Cu(II) --> Cu(I)Cu(II) --> Cu(I)Cu(I) are strongly solvent dependent. Reaction of the copper(I) complex with oxygen in methanol yields the same copper(II) species as is obtained independently from the reaction of Cu2+ with L. Hydroxylation of the benzene ring of the ligand is not observed. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Schindler, Siegfried/J-5045-2012 OI Schindler, Siegfried/0000-0002-9991-9513 NR 78 TC 46 Z9 46 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 MAY 27 PY 1992 VL 31 IS 11 BP 2255 EP 2264 DI 10.1021/ic00037a047 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600047 ER PT J AU DOORN, SK GORDON, KC DYER, RB WOODRUFF, WH AF DOORN, SK GORDON, KC DYER, RB WOODRUFF, WH TI TIME-RESOLVED INFRARED-SPECTROSCOPY OF RH2(1,3-DIISOCYANOPROPANE)4(BPH4)2 SO INORGANIC CHEMISTRY LA English DT Note ID ISOCYANIDE COMPLEXES; SPECTRA C1 LOS ALAMOS NATL LAB,ISOTOPE & STRUCT CHEM GRP,INC-4,MAIL STOP C345,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,PHOTOCHEM & PHOTOPHYS GRP,LOS ALAMOS,NM 87545. RI Gordon, Keith/B-7149-2008; OI Gordon, Keith/0000-0003-2833-6166 NR 8 TC 14 Z9 14 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 MAY 27 PY 1992 VL 31 IS 11 BP 2284 EP 2285 DI 10.1021/ic00037a054 PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600054 ER PT J AU FAZLURRAHMAN, AK YOUNG, VG VERKADE, JG AF FAZLURRAHMAN, AK YOUNG, VG VERKADE, JG TI UNEXPECTED FORMATION OF A NOVEL DIVANADIUM(IV) MONOPHOSPHINE COMPLEX SO INORGANIC CHEMISTRY LA English DT Note ID PHOSPHINE COMPLEXES; CRYSTAL-STRUCTURE C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 17 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 27 PY 1992 VL 31 IS 11 BP 2285 EP 2287 DI 10.1021/ic00037a055 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600055 ER PT J AU JACOBSON, SC GUIOCHON, G AF JACOBSON, SC GUIOCHON, G TI CONTRIBUTION OF IONICALLY IMMOBILIZED BOVINE SERUM-ALBUMIN TO THE RETENTION OF ENANTIOMERS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 8TH DANUBE SYMP ON CHROMATOGRAPHY CY SEP 02-06, 1991 CL WARSAW, POLAND SP POLISH ACAD SCI, INST PHYS CHEM, MILITARY TECH ACAD, INST CHEM ID LIQUID-CHROMATOGRAPHIC SEPARATION; PROTEIN STATIONARY PHASES; BAND PROFILES; RESOLUTION AB The retention of the enantiomers of mandelic acid and N-benzoylalanine was studied on columns prepared by immobilizing bovine serum albumin (BSA) on an anion exchanger. The amount of BSA fixed on thc column is easy to adjust and measure. The adsorption isotherms were determined. For each enantiomer, the isotherm is well accounted for by a bi-Langmuir equation. One term of the isotherm (which is the same for both enantiomers) corresponds to non-selective interactions and the other term to the chiral selective interactions. The column saturation capacity of this second term is 8% larger for the less strongly retained enantiomer. This saturation capacity corresponds approximately to one enantiomer molecule adsorbed for five BSA molecules immobilized. This result is in agreement with the assumption of the hydrophobic cavity of BSA being the chiral selective site. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 14 TC 22 Z9 22 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 MAY 27 PY 1992 VL 600 IS 1 BP 37 EP 42 DI 10.1016/0021-9673(92)85434-U PG 6 WC Chemistry, Analytical SC Chemistry GA HZ264 UT WOS:A1992HZ26400004 PM 1400844 ER PT J AU BULLOCK, RM RAPPOLI, BJ AF BULLOCK, RM RAPPOLI, BJ TI FORMATION OF A MANGANESE ALKYL COMPLEX AS AN INTERMEDIATE IN THE RING-OPENING HYDROFORMYLATION OF ALPHA-CYCLOPROPYLSTYRENE BY HMN(CO)5 SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID TRANSITION-METAL HYDRIDES; CARBONYL-COMPLEXES; HYDROGENATION; (N-BU)3P=O; MECHANISM; CHEMISTRY; MONOXIDE; LIGAND; BONDS; CO AB The reaction of alpha-cyclopropylstyrene (CPS) with HMn(CO)5 can result in either hydrogenation or hydroformylation. The hydrogenation occurs by a previously established pathway involving sequential hydrogen atom transfers from the metal hydride to the organic substrate, and is the predominant reaction observed with samples of HMn(CO)5 that have been thoroughly dried and purified using P2O5. With samples of HMn(CO)5 that have been not been treated with P2O5, the reaction that occurs with CPS is ring-opening hydroformylation, leading to the isolation of Mn2(CO)9(eta-1-HCOCH2CH2CH=C(Ph)CH3). The detailed procedures for preparation and handling of HMn(CO)5 that are reported in this paper enable the hydroformylation reaction to be reproducibly observed as the predominant reaction. An induction period of a few hours is typically observed in the hydroformylation, but addition of Mn2(CO)9(eta-1-tolualdehyde) eliminates the induction period. The hydroformylation reaction is inhibited by CO (1 atm). The manganese alkyl complex (CO)5MnCH2CH2CH=C(Ph)CH3 is an intermediate in the hydroformylation. The details of the mechanism of formation of this alkyl complex from CPS and HMn(CO)5 are not completely understood, but several mechanistic possibilities are considered. RP BULLOCK, RM (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 38 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 26 PY 1992 VL 429 IS 3 BP 345 EP 368 DI 10.1016/0022-328X(92)83184-J PG 24 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HZ172 UT WOS:A1992HZ17200006 ER PT J AU LAMELAS, FJ FUOSS, PH IMPERATORI, P KISKER, DW STEPHENSON, GB BRENNAN, S AF LAMELAS, FJ FUOSS, PH IMPERATORI, P KISKER, DW STEPHENSON, GB BRENNAN, S TI GALLIUM-ARSENIDE SURFACE RECONSTRUCTIONS DURING ORGANOMETALLIC VAPOR-PHASE EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID X-RAY-SCATTERING; GAAS(100) SURFACES; STOICHIOMETRY; INSITU; GROWTH; DIFFRACTION; GAAS(001) AB In situ surface x-ray scattering studies of the GaAs(001) surface were used to determine whether specific surface reconstructions occur during organometallic vapor-phase epitaxy. Prior to growth, we find that surfaces heated in the presence of As form a c(4 x 4) structure, while those heated in the absence of organometallics or in Ga form two similar fourfold reconstructions. We find no evidence for the presence of any surface reconstruction during the actual layer-by-layer growth process. C1 IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. CNR,ITSE,I-00016 MONTEROTONDO,ITALY. RP LAMELAS, FJ (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Imperatori, Patrizia/K-2260-2012 OI Imperatori, Patrizia/0000-0001-5143-9038 NR 23 TC 52 Z9 52 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 25 PY 1992 VL 60 IS 21 BP 2610 EP 2612 DI 10.1063/1.106924 PG 3 WC Physics, Applied SC Physics GA HV491 UT WOS:A1992HV49100012 ER PT J AU MYCEK, MA WEISS, S BIGOT, JY SCHMITTRINK, S CHEMLA, DS SCHAEFER, W AF MYCEK, MA WEISS, S BIGOT, JY SCHMITTRINK, S CHEMLA, DS SCHAEFER, W TI FEMTOSECOND TIME-RESOLVED FREE-INDUCTION DECAY OF ROOM-TEMPERATURE EXCITONS IN GAAS QUANTUM-WELLS SO APPLIED PHYSICS LETTERS LA English DT Article ID PICOSECOND AB We directly resolve the femtosecond free-induction decay of excitons in GaAs quantum wells at room temperature by upconverting the diffracted signal from a transient four-wave-mixing experiment. At high laser intensities, we find significant deviations from the temporal evolution of the time-integrated and peak amplitude signals, which we attribute to many-body Coulomb effects. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, HOECHSTLEISTUNGSRECHENZENTRUM, W-5170 JULICH 1, GERMANY. LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV MARBURG, DEPT PHYS, W-3550 MARBURG, GERMANY. UNIV MARBURG, CTR MAT SCI, W-3550 MARBURG, GERMANY. RP MYCEK, MA (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI weiss, shimon/B-4164-2009 OI weiss, shimon/0000-0002-0720-5426 NR 9 TC 19 Z9 19 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 25 PY 1992 VL 60 IS 21 BP 2666 EP 2668 DI 10.1063/1.106889 PG 3 WC Physics, Applied SC Physics GA HV491 UT WOS:A1992HV49100031 ER PT J AU BOYNTON, WV TROMBKA, JI FELDMAN, WC ARNOLD, JR ENGLERT, PAJ METZGER, AE REEDY, RC SQUYRES, SW WANKE, H BAILEY, SH BRUCKNER, J CALLAS, JL DRAKE, DM DUKE, P EVANS, LG HAINES, EL MCCLOSKEY, FC MILLS, H SHINOHARA, C STARR, R AF BOYNTON, WV TROMBKA, JI FELDMAN, WC ARNOLD, JR ENGLERT, PAJ METZGER, AE REEDY, RC SQUYRES, SW WANKE, H BAILEY, SH BRUCKNER, J CALLAS, JL DRAKE, DM DUKE, P EVANS, LG HAINES, EL MCCLOSKEY, FC MILLS, H SHINOHARA, C STARR, R TI SCIENCE APPLICATIONS OF THE MARS-OBSERVER GAMMA-RAY SPECTROMETER SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID GERMANIUM DETECTORS; PLANETARY SURFACES; RADIATION-DAMAGE; SPECTROSCOPY; LUNAR; SPECTRA; H2O; CO2 AB The Mars Observer gamma ray spectrometer will return data related to the elemental composition of Mars. The instrument has both a gamma ray spectrometer and several neutron detectors. The gamma ray spectrometer will return a spectrum nominally every 20 s from Mars permitting a map of the elemental abundances to be made. The gamma rays are emitted from nuclei involved in radioactive decay, from nuclei formed by capture of a thermal neutron, and from nuclei put in an excited state by a fast-neutron interaction. The gamma rays come from an average depth of the order of a few tens of centimeters. The spectrum will show sharp emission lines whose intensity determines the concentration of the element and whose energy identifies the element. The neutron detectors, using the fact that the orbital velocity of the Mars Observer spacecraft is similar to the velocity of thermal neutrons, determine both the thermal and epithermal neutron flux. These parameters are particularly sensitive to the concentration of hydrogen in the upper meter of the surface. By combining the results from both techniques it is possible to map the depth dependence of hydrogen in the upper meter as well. These data permit a variety of Martian geoscience problems to be addressed including the crust and mantle composition, weathering processes, volcanism, and the volatile reservoirs and processes. In addition, the instrument is also sensitive to gamma ray and particle fluxes from non-Martian sources and will be able to address problems of astrophysical interest including gamma ray bursts, the extragalactic background, and solar processes. C1 UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. SAN JOSE STATE UNIV,DEPT CHEM,SAN JOSE,CA 95192. JET PROP LAB,PASADENA,CA 91109. CORNELL UNIV,CTR RADIOPHYS & SPACE RES,ITHACA,NY 14853. MAX PLANCK INST CHEM,W-6500 MAINZ,GERMANY. SUNRISE RES INC,EUGENE,OR. NR 50 TC 38 Z9 38 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-PLANET JI J. Geophys. Res.-Planets PD MAY 25 PY 1992 VL 97 IS E5 BP 7681 EP 7698 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KU049 UT WOS:A1992KU04900003 ER PT J AU FERRIS, KF AF FERRIS, KF TI SCF AND CORRELATED LEVEL DETERMINATION OF THE MOLECULAR AND VIBRATIONAL STRUCTURE OF ORTHOSILICIC ACID, SI(OH)4 SO JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM LA English DT Article ID SILANOL WATER INTERACTIONS; ORBITAL CALCULATIONS; AMORPHOUS SILICA; BOND; HYDROXYLS; FRAMEWORK; MODELS; H4SIO4 AB The focus of this investigation was to determine the relevance of electron correlation corrections in predicting the geometry and molecular spectra of model compounds for silicate materials. We have performed a series of ab initio molecular orbital calculations on various isomers of Si (OH)4 at the self-consistent field (SCF) and second-order many-body perturbation theory (MBPT(2)) levels using double-zeta polarized (DZP) quality basis sets. Electron correlation affects both the molecular and vibrational structure of these compounds. The use of a single scaling factor to account for electron correlation and anharmonic effects does not lead to consistent prediction of MBPT(2) properties. RP FERRIS, KF (reprint author), PACIFIC NW LAB, CTR MAT & CHEM SCI, RICHLAND, WA 99352 USA. NR 25 TC 6 Z9 6 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 J MOL STRUC-THEOCHEM JI Theochem-J. Mol. Struct. PD MAY 25 PY 1992 VL 257 IS 3-4 BP 499 EP 506 DI 10.1016/0166-1280(92)85059-T PG 8 WC Chemistry, Physical SC Chemistry GA HZ663 UT WOS:A1992HZ66300018 ER PT J AU LOPEZGARCIA, P ABAD, JP SMITH, C AMILS, R AF LOPEZGARCIA, P ABAD, JP SMITH, C AMILS, R TI GENOMIC ORGANIZATION OF THE HALOPHILIC ARCHAEON HALOFERAX-MEDITERRANEI - PHYSICAL MAP OF THE CHROMOSOME SO NUCLEIC ACIDS RESEARCH LA English DT Article ID HALOBACTERIUM-VOLCANII; GEL-ELECTROPHORESIS; ARCHAEBACTERIUM; SEQUENCE; DNA; SEPARATION; ELEMENTS; HALOBIUM; PROTEIN; SYSTEM AB Pulsed field gel electrophoresis (PFG) has been used to study the genomic organization of the halophilic archaeon Haloferax mediterranei. Analysis of the different genomic elements as well as the restriction patterns obtained with several endonucleases revealed that this microorganism has a circular chromosome of 2.9 Mb and, at least, three extrachromosomal elements of 490, 320 and 130 kb respectively. The complete physical map of the chromosome for the endonucleases PacI and BamHI has been constructed, and several BcII, BgIII and DraI restriction fragments have been aligned on these maps. The localization of heterologous and homologous genes on the physical map, including those for rRNA, lay the ground work for the construction of a genetic map. C1 UNIV AUTONOMA MADRID, CTR BIOL MOLEC, E-28049 MADRID, SPAIN. LAWRENCE BERKELEY LAB, DEPT MOLEC & CELL BIOL, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV CHEM BIODYNAM, BERKELEY, CA 94720 USA. RI Lopez-Garcia, Purificacion/B-6775-2012; OI Lopez-Garcia, Purificacion/0000-0002-0927-0651; Smith, Cassandra/0000-0002-0346-8907 NR 31 TC 27 Z9 27 U1 1 U2 1 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 25 PY 1992 VL 20 IS 10 BP 2459 EP 2464 DI 10.1093/nar/20.10.2459 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HX134 UT WOS:A1992HX13400009 PM 1598204 ER PT J AU AMEMIYA, CT ALEGRIAHARTMAN, MJ ASLANIDIS, C CHEN, C NIKOLIC, J GINGRICH, JC DEJONG, PJ AF AMEMIYA, CT ALEGRIAHARTMAN, MJ ASLANIDIS, C CHEN, C NIKOLIC, J GINGRICH, JC DEJONG, PJ TI A 2-DIMENSIONAL YAC POOLING STRATEGY FOR LIBRARY SCREENING VIA STS AND ALU-PCR METHODS SO NUCLEIC ACIDS RESEARCH LA English DT Article ID POLYMERASE CHAIN-REACTION; RAPID ISOLATION; DNA; SEQUENCES; CLONING; FRAGMENTS AB We have developed a simple two-dimensional YAC pooling strategy to facilitate YAC library screening via STS and Alu-PCR approaches. The method has been implemented using the human total genomic YAC library of Olson and coworkers, and its validity tested by isolation of many chromosomes 19- and 21-specific YACs. The Alu-PCR approach is notable in that it is hybridization-based, such that PCR primer pairs do not need to be repeatedly synthesized and tested for each screening step. C1 LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. RP AMEMIYA, CT (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,CTR HUMAN GENOME,L-452,LIVERMORE,CA 94551, USA. NR 20 TC 23 Z9 23 U1 0 U2 0 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 MAY 25 PY 1992 VL 20 IS 10 BP 2559 EP 2563 DI 10.1093/nar/20.10.2559 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HX134 UT WOS:A1992HX13400023 PM 1598215 ER PT J AU DELEON, JM BATISTIC, I BISHOP, AR CONRADSON, SD TRUGMAN, SA AF DELEON, JM BATISTIC, I BISHOP, AR CONRADSON, SD TRUGMAN, SA TI POLARON ORIGIN FOR ANHARMONICITY OF THE AXIAL OXYGEN IN YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; TRANSITION AB We present exact diagonalization results of an electron-phonon model Hamiltonian for the O(4)-Cu(1)-O(4) cluster in YBa2Cu3O7. For large enough electron-infrared-phonon coupling the motion of holes and ions becomes strongly correlated, i.e., polaronic, leading to a double-well structure for the infrared mode, as encountered in x-ray-absorption fine structure. In contrast, the associated Raman mode shows a single-well behavior even for large electron-Raman-phonon coupling. The appearance of polarons accompanies nonadiabatic behavior yielding optical spectroscopy predictions differing from those obtained from harmonic or anharmonic lattice dynamics models. RP DELEON, JM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 34 TC 96 Z9 96 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 MAY 25 PY 1992 VL 68 IS 21 BP 3236 EP 3239 DI 10.1103/PhysRevLett.68.3236 PG 4 WC Physics, Multidisciplinary SC Physics GA HV466 UT WOS:A1992HV46600031 ER PT J AU MATTSON, JE SOWERS, CH BERGER, A BADER, SD AF MATTSON, JE SOWERS, CH BERGER, A BADER, SD TI MAGNETORESISTIVITY AND OSCILLATORY INTERLAYER MAGNETIC COUPLING OF SPUTTERED FE/NB SUPERLATTICES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTILAYERED STRUCTURES; FE/CR AB Sputtered Fe(20 angstrom)/Nb superlattices were prepared with Nb thicknesses ranging from approximately 2 to 40 angstrom, and oscillatory interlayer magnetic coupling was observed by means of magnetoresistance (MR), magnetometry, and Kerr rotation measurements. As many as five oscillations between ferromagnetic and antiferromagnetic coupling were observed at room temperature with a Nb periodicity of approximately 9 angstrom. The largest negative MR measured, however, was only 0.3%. The low MR values and high resistivity (60-120-mu-OMEGA-cm) suggest that the structural disorder associated with the lattice mismatch (13% in this system) plays an important role in governing the transport phenomenon. C1 FORSCHUNGSZENTRUM JULICH, INST GRENZFLACHENFORSCH & VAKUUMPHYS, W-5170 JULICH 1, GERMANY. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RI Bader, Samuel/A-2995-2013; Berger, Andreas/D-3706-2015 OI Berger, Andreas/0000-0001-5865-6609 NR 21 TC 53 Z9 53 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 25 PY 1992 VL 68 IS 21 BP 3252 EP 3255 DI 10.1103/PhysRevLett.68.3252 PG 4 WC Physics, Multidisciplinary SC Physics GA HV466 UT WOS:A1992HV46600035 ER PT J AU MING, X AF MING, X TI MAGNETIC-RELAXATION IN GENERALIZED CRITICAL STATE MODEL SO PHYSICS LETTERS A LA English DT Article ID HIGH-TC SUPERCONDUCTORS; BA-CU-O; VORTEX-GLASS SUPERCONDUCTIVITY; FLUX-CREEP; II SUPERCONDUCTORS; HARD SUPERCONDUCTORS; ACTIVATION-ENERGIES; TEMPERATURE; DEPENDENCE; CRYSTAL AB Calculations of magnetic relaxation have been carried out, based on generalized critical state and flux creep models. The calculated relaxation rate as a function of the field is in good agreement with experimental data in high-T(c) superconductors. Also discussed are the critical state model, the flux pinning, and the field dependence of the magnetic relaxation. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP MING, X (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 56 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 25 PY 1992 VL 165 IS 4 BP 373 EP 376 PG 4 WC Physics, Multidisciplinary SC Physics GA HY687 UT WOS:A1992HY68700014 ER PT J AU HALL, GE MUCKERMAN, JT PRESES, JM WESTON, RE FLYNN, GW AF HALL, GE MUCKERMAN, JT PRESES, JM WESTON, RE FLYNN, GW TI TIME-RESOLVED FTIR STUDIES OF THE PHOTODISSOCIATION OF PYRUVIC-ACID AT 193 NM SO CHEMICAL PHYSICS LETTERS LA English DT Article ID VIBRATIONAL-ENERGY DISTRIBUTION; GAS-PHASE PHOTOCHEMISTRY; THERMAL-DECOMPOSITION; EMISSION-SPECTROSCOPY; LASER PHOTOLYSIS; ROTATIONAL-STATE; O(1D2) REACTIONS; DIODE-LASER; PHOTOFRAGMENTATION; DYNAMICS AB Infrared emission from carbon dioxide produced in the 193 nm photolysis of pyruvic acid vapor has been investigated using time-resolved Fourier transform infrared spectroscopy as a probe. A broad feature, strongly red-shifted from the antisymmetric stretching fundamental (v3) of CO2, dominates the early spectrum. A statistical model using a linear surprisal is shown to provide good agreement with the observed spectral contour, but only if the energy available to the photofragments corresponds to the direct formation of acetaldehyde along with CO2. C1 COLUMBIA UNIV,DEPT CHEM,NEW YORK,NY 10027. RP HALL, GE (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Muckerman, James/D-8752-2013; Hall, Gregory/D-4883-2013 OI Hall, Gregory/0000-0002-8534-9783 NR 32 TC 15 Z9 15 U1 3 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 22 PY 1992 VL 193 IS 1-3 BP 77 EP 83 DI 10.1016/0009-2614(92)85685-4 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HW683 UT WOS:A1992HW68300012 ER PT J AU CHATTERJEE, K PARKER, DH WURZ, P LYKKE, KR GRUEN, DM STOCK, LM AF CHATTERJEE, K PARKER, DH WURZ, P LYKKE, KR GRUEN, DM STOCK, LM TI FAST ONE-STEP SEPARATION AND PURIFICATION OF BUCKMINSTERFULLERENE, C-60, FROM CARBON SOOT SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID C-60; FORM C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717. RP CHATTERJEE, K (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 41 Z9 41 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAY 22 PY 1992 VL 57 IS 11 BP 3253 EP 3254 DI 10.1021/jo00037a056 PG 2 WC Chemistry, Organic SC Chemistry GA HW180 UT WOS:A1992HW18000056 ER PT J AU OU, CY CIESIELSKI, CA MYERS, G BANDEA, CI LUO, CC KORBER, BTM MULLINS, JI SCHOCHETMAN, G BERKELMAN, RL ECONOMOU, AN WITTE, JJ FURMAN, LJ SATTEN, GA MACINNES, KA CURRAN, JW JAFFE, HW AF OU, CY CIESIELSKI, CA MYERS, G BANDEA, CI LUO, CC KORBER, BTM MULLINS, JI SCHOCHETMAN, G BERKELMAN, RL ECONOMOU, AN WITTE, JJ FURMAN, LJ SATTEN, GA MACINNES, KA CURRAN, JW JAFFE, HW TI MOLECULAR EPIDEMIOLOGY OF HIV TRANSMISSION IN A DENTAL PRACTICE SO SCIENCE LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; HEPATITIS-B; TYPE-1; AIDS; SENSITIVITY; PHYLOGENIES; INFECTION; SEQUENCES; THERAPY; RISK AB Human immunodeficiency virus type 1 (HIV-1) transmission from infected patients to health-care workers has been well documented, but transmission from an infected health-care worker to a patient has not been reported. After identification of an acquired immunodeficiency syndrome (AIDS) patient who had no known risk factors for HIV infection but who had undergone an invasive procedure performed by a dentist with AIDS, six other patients of this dentist were found to be HIV-infected. Molecular biologic studies were conducted to complement the epidemiologic investigation. Portions of the HIV proviral envelope gene from each of the seven patients, the dentist, and 35 HIV-infected persons from the local geographic area were amplified by polymerase chain reaction and sequenced. Three separate comparative genetic analyses-genetic distance measurements, phylogenetic tree analysis, and amino acid signature pattern analysis-showed that the viruses from the dentist and five dental patients were closely related. These data, together with the epidemiologic investigation, indicated that these patients became infected with HIV while receiving care from a dentist with AIDS. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. STANFORD UNIV,MED CTR,SCH MED,DEPT MICROBIOL & IMMUNOL,STANFORD,CA 94305. FLORIDA DEPT HLTH & REHAB SERV,TALLAHASSEE,FL. CTR DIS CONTROL,NATL CTR PREVENT SERV,DIV ORAL HLTH,ATLANTA,GA 30333. RP OU, CY (reprint author), CTR DIS CONTROL,NATL CTR INFECT DIS,DIV HIV AIDS,ATLANTA,GA 30333, USA. OI Korber, Bette/0000-0002-2026-5757 NR 57 TC 340 Z9 353 U1 0 U2 28 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 22 PY 1992 VL 256 IS 5060 BP 1165 EP 1171 DI 10.1126/science.256.5060.1165 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HV192 UT WOS:A1992HV19200025 PM 1589796 ER PT J AU XIANG, XD HOU, JG BRICENO, G VAREKA, WA MOSTOVOY, R ZETTL, A CRESPI, VH COHEN, ML AF XIANG, XD HOU, JG BRICENO, G VAREKA, WA MOSTOVOY, R ZETTL, A CRESPI, VH COHEN, ML TI SYNTHESIS AND ELECTRONIC TRANSPORT OF SINGLE-CRYSTAL K3C60 SO SCIENCE LA English DT Article AB Sizable single crystals of C60 have been synthesized and doped with potassium. Above the superconducting transition temperature T(c), the electrical resistivity rho(T) displays a classic metal-like temperature dependence. The transition to the superconducting state at T(c) = 19.8 K is extremely sharp, with a transition width DELTA-T < 200 mK. In contrast to transport behavior of doped polycrystalline and granular thin films, no anomalous fluctuations are observed near T(c) in single crystal specimens. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Hou, Jianguo/G-5076-2010; Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017; OI Zettl, Alex/0000-0001-6330-136X; Crespi, Vincent/0000-0003-3846-3193 NR 9 TC 122 Z9 127 U1 2 U2 25 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 22 PY 1992 VL 256 IS 5060 BP 1190 EP 1191 DI 10.1126/science.256.5060.1190 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HV192 UT WOS:A1992HV19200031 PM 17795215 ER PT J AU HOLMAN, R HSU, SDH KEPHART, TW KOLB, EW WATKINS, R WIDROW, LM AF HOLMAN, R HSU, SDH KEPHART, TW KOLB, EW WATKINS, R WIDROW, LM TI SOLUTIONS TO THE STRONG-CP PROBLEM IN A WORLD WITH GRAVITY SO PHYSICS LETTERS B LA English DT Article ID COSMOLOGICAL CONSTANT; INVISIBLE AXION; CONSERVATION; VACUUM; ZERO AB We examine various solutions of the strong-CP problem to determine their sensitivity to possible violations of global symmetries by Planck scale physics. While some solutions remain viable even in the face of such effects, violations of the Peccei-Quinn (PQ) symmetry by non-renormalizable operators of dimension less than 10 will generally shift the value of thetaBAR to values inconsistent with the experimental bound thetaBAR less than or similar 10(-9). We show that it is possible to construct axion models where gauge symmetries protect the PQ symmetry to the requisite level. C1 CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. FERMI NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,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 35 TC 176 Z9 176 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 MAY 21 PY 1992 VL 282 IS 1-2 BP 132 EP 136 DI 10.1016/0370-2693(92)90491-L PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX882 UT WOS:A1992HX88200023 ER PT J AU CHARDIN, G RAX, JM AF CHARDIN, G RAX, JM TI CP VIOLATION - A MATTER OF (ANTI)GRAVITY SO PHYSICS LETTERS B LA English DT Article ID KO-KBARO SYSTEM; LONGITUDINAL COHERENCE; FUNDAMENTAL PARAMETERS; ENERGY-DEPENDENCE; BLACK-HOLES; EXCITATION; RADIATION; DETECTOR AB We reexamine the possibility that CP violation observed in the neutral kaon system may be explained by "antigravity" - a different acceleration of matter and antimatter in a gravitational field. We criticize the impossibility arguments which led, thirty years ago, to the rejection of "antigravity". In particular, the reexpression of Good's argument suggests a simple approximate expression for epsilon, the CP violating parameter. Studying the compatibility of "antigravity" with the first law of thermodynamics provides a link with the Unruh and Bekenstein-Hawking effects. Requiring the compatibility with the second law indicates that the fundamental quantity in this problem is entropy or information. Some predictions are presented and two experimental tests are proposed. C1 PRINCETON UNIV,PPPL,PRINCETON,NJ 08544. RP CHARDIN, G (reprint author), CTR ETUD SACLAY,DAPNIA SPP,F-91191 GIF SUR YVETTE,FRANCE. NR 53 TC 25 Z9 25 U1 0 U2 7 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 MAY 21 PY 1992 VL 282 IS 1-2 BP 256 EP 262 DI 10.1016/0370-2693(92)90510-B PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HX882 UT WOS:A1992HX88200042 ER PT J AU COLUMBIA, MR CRABTREE, AM THIEL, PA AF COLUMBIA, MR CRABTREE, AM THIEL, PA TI EVIDENCE FOR A HYDROGEN-BONDED COMPLEX BETWEEN WATER AND FORMIC-ACID COADSORBED ON PT(111) SO SURFACE SCIENCE LA English DT Article ID IRREVERSIBLY ADSORBED ADATOMS; PLATINUM-ELECTRODE; HETEROGENEOUS ELECTROCATALYSIS; AD-ATOMS; SINGLE-CRYSTAL; OXIDATION; SURFACES; HCOOH; ADSORPTION; METHANOL AB We have studied the interaction of water and formic acid coadsorbed on Pt(111) using thermal desorption spectroscopy (TDS) and high resolution electron energy loss spectroscopy (HREELS). TDS experiments where the exposure of one adsorbate is constant and the other is varied indicate that water and formic acid undergo mutual displacement from surface sites; upon completion, this displacement leaves reproducible amounts of both adsorbates in a " mixed" overlayer suggesting the formation of a complex with water: acid stoichiometry between 2:1 and 3:1. TDS experiments in which D2O is substituted for H2O show the existence of hydrogen bonding between formic acid and D2O. Water does not affect the conversion of molecular acid to formate, and formate may be involved in the complex in a manner similar to formic acid. We discuss models for overlayer complexes of water and formic acid based on hydrogen bonding between the two adspecies, C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP COLUMBIA, MR (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 46 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 21 PY 1992 VL 271 IS 1-2 BP 139 EP 148 DI 10.1016/0039-6028(92)90868-7 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HY363 UT WOS:A1992HY36300015 ER PT J AU XIAO, XD XIE, YL SHEN, YR AF XIAO, XD XIE, YL SHEN, YR TI SURFACE-DIFFUSION PROBED BY LINEAR OPTICAL DIFFRACTION SO SURFACE SCIENCE LA English DT Article AB It is demonstrated that linear diffraction off an adsorbate monolayer grating can be used to study surface diffusion of the adsorbates. The signal-to-noise ratio is greatly enhanced with a polarization modulation scheme. The example of CO on Ni(110) shows that the coverage dependence of the surface diffusion coefficient can be significant. RP XIAO, XD (reprint author), LAWRENCE BERKELEY LAB,DEPT PHYS,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 7 TC 56 Z9 56 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 21 PY 1992 VL 271 IS 1-2 BP 295 EP 298 DI 10.1016/0039-6028(92)90885-A PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HY363 UT WOS:A1992HY36300032 ER PT J AU KANG, HC EVANS, JW AF KANG, HC EVANS, JW TI SCALING ANALYSIS OF SURFACE-ROUGHNESS AND BRAGG OSCILLATION DECAY IN MODELS FOR LOW-TEMPERATURE EPITAXIAL-GROWTH SO SURFACE SCIENCE LA English DT Article ID MOLECULAR-BEAM EPITAXY; INTERFACE GROWTH; BALLISTIC DEPOSITION; CONTINUUM EQUATION; DIFFRACTION; TRANSITIONS; SIMULATION; MECHANISM; FILMS AB The structure of epitaxial thin films during growth is often probed experimentally up to only a dozen or so monolayers. Here we consider several models for low-temperature growth where thermal processes are inoperative. We find effective scaling of the interface width, W, of the form W2 approximately [h]2-beta or log [h], even in this experimentally relevant regime of small height [h]. This scaling behavior can be understood through consideration of the appropriate stochastic evolution equation for the coarse-grained film height. We emphasize physical interpretation of the terms in this equation which determine scaling, especially those reflecting lateral coupling due to realistic adsorption site geometries and deposition dynamics. Finally we consider how growth (or scaling) of W is reflected in the behavior of transient quantities such as Bragg intensity oscillations. We show that the envelope of these oscillations tends to decay like e-9.9W2 with increasing W. This provides a simple connection between W and the most commonly observed experimental quantity. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT MATH,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RI Kang, Hway Chuan/A-3401-2012 NR 50 TC 52 Z9 52 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 MAY 21 PY 1992 VL 271 IS 1-2 BP 321 EP 330 DI 10.1016/0039-6028(92)90888-D PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HY363 UT WOS:A1992HY36300035 ER PT J AU LOFFTUS, KD QUINBYHUNT, MS HUNT, AJ LIVOLANT, F MAESTRE, M AF LOFFTUS, KD QUINBYHUNT, MS HUNT, AJ LIVOLANT, F MAESTRE, M TI LIGHT-SCATTERING BY PROROCENTRUM-MICANS - A NEW METHOD AND RESULTS SO APPLIED OPTICS LA English DT Article ID DINOFLAGELLATE CHROMOSOMES; POLARIZED-LIGHT; DIFFERENTIAL SCATTERING; RELATIVE IMPORTANCE; PRIMARY PRODUCERS; MUELLER MATRIX; MARINE; PHYTOPLANKTON; NANNOPLANKTON; ARRANGEMENT AB Striking light-scattering behavior was observed from a marine dinoflagellate, Prorocentrum micans. Measurements of the angular dependence of the 16 Mueller matrix elements were performed on single cells with a polarization-modulation nephelometer by using a new method for cell immobilization. First the dinoflagellate cells were immobilized in a transparent silica gel containing alcohol, and then a second liquid was diffused into the gel to match the index of refraction of the gel network, thereby producing a transparent support medium that scatters less than one tenth the amount of light scattered by a single cell at 90-degrees. Measurements of scattering by a single cell revealed that all 16 matrix elements were significantly nonzero and different from each other. All matrix elements have an extremely rich, reproducible structure that is highly dependent on cell orientation. The matrix elements symmetrically across the diagonal were not equivalent. Striking features of the measurements are the large peak values Of S13, S14, and other off-diagonal block elements. We believe that this is the first report of such scattering signals by single, suspended marine microorganisms. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV BIOL & MED,BERKELEY,CA 94720. NR 49 TC 8 Z9 9 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 MAY 20 PY 1992 VL 31 IS 15 BP 2924 EP 2931 PG 8 WC Optics SC Optics GA HU712 UT WOS:A1992HU71200036 PM 20725226 ER PT J AU GALLANT, YA HOSHINO, M LANGDON, AB ARONS, J MAX, CE AF GALLANT, YA HOSHINO, M LANGDON, AB ARONS, J MAX, CE TI RELATIVISTIC, PERPENDICULAR SHOCKS IN ELECTRON-POSITRON PLASMAS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; ISM, INDIVIDUAL (CRAB NEBULA); PLASMAS; RADIATION MECHANISMS; CYCLOTRON AND SYNCHROTRON; SHOCK WAVES ID PULSAR POLAR CAPS; PARTICLE-ACCELERATION; ASTROPHYSICAL SHOCKS; RADIO-SOURCES; CRAB-NEBULA; HOT SPOTS; MODEL; VARIABILITY; RADIATION; ORIGIN AB We use one-dimensional particle-in-cell plasma simulations to study the mechanical structure and thermalization properties of collisionless relativistic shock waves in electron-positron plasmas. We consider shocks propagating perpendicularly to the magnetic field direction. We show that these shock waves exist, and that they are completely parameterized by sigma, the ratio of the upstream Poynting flux to the upstream kinetic energy flux. The mechanical properties of the shock structure are controlled by magnetic reflection of all the particles, leading to a strong magnetic overshoot in the leading edge of the shock wave. The shock waves radiate a strong, semicoherent precursor wave with extraordinary mode polarization into the upstream medium, and also create an approximately Rayleigh-Jeans spectrum of extraordinary modes in the downstream medium. The spectrum of these downstream waves is broadband, extending to hundreds of harmonics above the cyclotron frequency based on upstream parameters. The downstream plasma is completely thermalized in the plane perpendicular to the magnetic field direction, with electron and positron distribution functions very close to relativistic Maxwellians, despite the complete absence of Coulomb collisions. The temperatures of these Maxwellian distributions are those expected from the Rankine-Hugoniot shock jump conditions, once these are modified to include the portion of the shock energy invested in extraordinary modes. We show how the jump conditions are modified by the presence of wave fluctuations, and use them to provide a macroscopic description of these collisionless shock flows. We briefly discuss the results of a two-dimensional simulation that demonstrates the generality of our results beyond the assumption of the one-dimensional case. We suggest that the thermalization mechanism is the formation of a synchrotron maser by the coherently reflected particles in the shock front. Because the downstream medium is thermalized, we argue that perpendicular shocks in pure electron-positron plasmas are not good candidates as nonthermal particle accelerators. In related work, Hoshino et al. have shown that relativistic perpendicular shocks in electron-positron-ion plasmas can lead to substantial nonthermal particle acceleration. The shocks in pair plasmas investigated here constitute the leading part of the shock structure in such three-component plasmas. We briefly discuss the possible observability of the high-frequency extraordinary mode radiation created by these shocks. In particular, we suggest that recently observed short time-scale variability of the centimeter wave emission in compact extragalactic radio sources might be attributable to the precursor radiation from relativistic shocks in the magnetized coronae of accretion disks around the central black holes in AGNs. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. OI Max, Claire/0000-0003-0682-5436 NR 40 TC 104 Z9 104 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 MAY 20 PY 1992 VL 391 IS 1 BP 73 EP 101 DI 10.1086/171326 PN 1 PG 29 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100006 ER PT J AU KITAMOTO, S TSUNEMI, H ROUSSELDUPRE, D AF KITAMOTO, S TSUNEMI, H ROUSSELDUPRE, D TI X-RAY-SPECTRUM AND TIME-VARIATION OF X1850-087 IN THE GLOBULAR-CLUSTER NGC-6712 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GLOBULAR CLUSTERS, INDIVIDUAL (NGC-6712); STARS, INDIVIDUAL (X1850-087); STARS, NEUTRON; X-RAYS, STARS ID K LINE EMISSION; EXOSAT OBSERVATIONS; ABSORPTION FEATURE; BINARY; DISCOVERY; COMPTONIZATION; BURSTS; PERIOD; PLASMA; GINGA AB We observed the energy spectrum and the time variation of the X-rays from X1850-087 in the globular cluster NGC 6712 with the Large Area Counter on board Ginga. The luminosity of X1850-087, when we observed it, was 1.3 x 10(36) (D/6.8 kpc)2 ergs s-1. The X-ray energy spectrum can be represented by a single power-law type spectrum with a photon index of 2.3, with an interstellar absorption of less than 10(21) H atoms cm-2. A model consisting of disk blackbody and radiation from the neutron star requires an unphysically small inner-disk-radius and a small emission region on the neutron star surface where allowances have been made for the difference between the color temperature and the effective temperature. On the other hand, a model where the main X-ray formation mechanism is Compton scattering indicates that the plasma, which is responsible for Compton scattering, becomes thin and hot in the low accretion rate state. No significant periodic variation was detected, but a significant variation below 1 Hz was found, which is similar to a high-frequency noise observed in the island state of the atoll sources. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV SPACE SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. RP KITAMOTO, S (reprint author), OSAKA UNIV, FAC SCI, DEPT PHYS, 1-1 MACHIKANEYAMA CHO, TOYONAKA, OSAKA 560, JAPAN. NR 37 TC 12 Z9 12 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 20 PY 1992 VL 391 IS 1 BP 220 EP 227 DI 10.1086/171337 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100017 ER PT J AU WOOSLEY, SE BARON, E AF WOOSLEY, SE BARON, E TI THE COLLAPSE OF WHITE-DWARFS TO NEUTRON-STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, THEORY; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS, MASS LOSS; STARS, NEUTRON; STARS, WHITE DWARFS ID GAMMA-RAY BURSTS; II SUPERNOVAE; COSMIC FIREBALLS; ELECTRON-CAPTURE; MASSIVE STARS; ENERGY-LOSS; M. STARS; EVOLUTION; NUCLEOSYNTHESIS; MECHANISM AB The observable consequences of an accreting white dwarf collapsing directly to a neutron star are considered. The outcome depends critically upon the nature of the wind that is driven by neutrino absorption in the surface layers as the dwarf collapses. Unlike previous calculations which either ignored mass loss or employed inadequate zoning to resolve it, we find a characteristic mass-loss rate of about 0.005 M. s-1 and an energy input of 5 x 10(50) ergs s-1. Such a large mass-loss rate almost completely obscures any prompt electromagnetic display and certainly rules out the production by this model of gamma-ray bursts situated at cosmological distances. The occurrence of such collapses within our own Galaxy might, however, be detected and limited by their nucleosynthesis and gamma-ray line emission. To avoid the overproduction of rare neutron-rich isotopes heavier than iron, such-events must be very infrequent, probably happening no more than once every thousand years. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV OKLAHOMA,DEPT PHYS & ASTRON,NORMAN,OK 73019. RP WOOSLEY, SE (reprint author), UNIV CALIF SANTA CRUZ OBSERV,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064, USA. RI Baron, Edward/A-9041-2009 OI Baron, Edward/0000-0001-5393-1608 NR 46 TC 131 Z9 132 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 MAY 20 PY 1992 VL 391 IS 1 BP 228 EP 235 DI 10.1086/171338 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100018 ER PT J AU CHUANG, KW WHITE, RS KLEBESADEL, RW LAROS, JG AF CHUANG, KW WHITE, RS KLEBESADEL, RW LAROS, JG TI THE SPATIAL-DISTRIBUTION OF GAMMA-RAY BURSTS FROM PIONEER-VENUS-ORBITER SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, BURSTS; STARS, STATISTICS ID KONUS EXPERIMENT DATA; CATALOG; ORIGIN AB A sample of 225 observed gamma-ray bursts between 1978 September and 1988 July from the Pioneer Venus Orbiter (PVO) has been recently studied to test the homogeneity of the burst source population in space with the log N(> P(c))-log P(c) and log (dN/dP(c))-log P(c) relations. The N(> P(c)) is the number of bursts yr-1 which have maximum photon count rates in excess of P(c), dN/dP(c) is the number of bursts yr-1 (counts [0.25 s]-1)-1, and P(c) is the peak count rate (counts [0.25 s]-1) above the background. The relations N(> P(c)) approximately P(c)-1.5 and dN/dP(c) approximately P(c)-2.5 are expected if the gamma bursters are uniformly distributed in space. The Kolmogorov-Smirnov statistic gives a probability of 0.93 that the observed integral distribution N(> P(c)) is drawn from the expected uniform distribution P(c)-1.5. A least-squares 1 standard deviation fit to the observed differential distribution gives dN/dP(c) approximately P(c)-2.42 +/- 0.07. Both are consistent with a uniform distribution in space of the parent population of burst sources. The differential fit was possible, for the first time, because of the large number of events in the PVO data set. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP CHUANG, KW (reprint author), UNIV CALIF RIVERSIDE,INST GEOPHYS & PLANETARY PHYS,RIVERSIDE,CA 92521, USA. NR 28 TC 17 Z9 18 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 MAY 20 PY 1992 VL 391 IS 1 BP 242 EP 245 DI 10.1086/171340 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100020 ER PT J AU LIEDAHL, DA KAHN, SM OSTERHELD, AL GOLDSTEIN, WH AF LIEDAHL, DA KAHN, SM OSTERHELD, AL GOLDSTEIN, WH TI X-RAY EMISSION-LINE SPECTRA OF PHOTOIONIZED PLASMAS - DENSITY SENSITIVITY OF THE FE L-SHELL SERIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION, ACCRETION DISKS; ATOMIC PROCESSES; LINE, FORMATION; PLASMAS; X-RAYS, STARS ID HIGHLY IONIZED IRON; NEBULAR MODELS; SOLAR-FLARE; XVII; X-1 AB The circumsource environments of accretion-powered X-ray sources are likely to support relatively dense (n > 10(11) cm-3) photoionized X-ray emission-line regions. T-he Fe L-shell ions provide a versatile class of plasma diagnostics in this regime, their multielectron structures resulting in diverse spectral phenomena. In this paper, we concentrate on the spectral response of Fe L-shell ions to variations in electron density over the range 10(11)-10(16) cm-3. We find that density-sensitive line ratios exist in the wavelength interval 12-17 angstrom for the ions Fe XVII-XXI. The prominent role of radiative recombination in the population kinetics distinguishes the density-sensitive Fe lines in photoionized plasmas from those which operate in coronal equilibrium plasmas. We present the results of detailed atomic modeling of these ions and discuss applications to spectroscopic observations of accretion-driven X-ray sources. C1 UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LIEDAHL, DA (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 35 TC 21 Z9 21 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 20 PY 1992 VL 391 IS 1 BP 306 EP 317 DI 10.1086/171347 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100027 ER PT J AU BARNETT, RN REYNOLDS, PJ LESTER, WA AF BARNETT, RN REYNOLDS, PJ LESTER, WA TI MONTE-CARLO DETERMINATION OF THE OSCILLATOR STRENGTH AND EXCITED-STATE LIFETIME FOR THE LI 2(2)S-]2(2)P TRANSITION SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID RANDOM-WALK; QUANTUM-CHEMISTRY; WAVE-FUNCTIONS; LITHIUM ATOM; MOLECULES AB A recently developed Monte Carlo method is used to compute the 2(2)S --> 2(2)P transition dipole moment of Li. This approach employs a guided Metropolis random walk with quantum Monte Carlo "side" walks to sample the required probability distributions. The transition dipole moment is employed to obtain the oscillator strength and excited-state lifetime. Our most accurately converged calculations yield an oscillator strength of 0.742(7) and excited-state lifetime of 27.41(35) ns. These results are in excellent agreement with precise experimental measurements of 0.742(1) and 27.29(4) ns, respectively. In addition, single-state expectation values are computed for both states. Monte Carlo parameters, such as the time step size and the convergence time, are varied in order to study their effect on computed results. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP BARNETT, RN (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. NR 30 TC 13 Z9 13 U1 2 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 MAY 20 PY 1992 VL 42 IS 4 BP 837 EP 847 DI 10.1002/qua.560420421 PG 11 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA HL977 UT WOS:A1992HL97700018 ER PT J AU STOLORZ, P LAPEDES, A XIA, Y AF STOLORZ, P LAPEDES, A XIA, Y TI PREDICTING PROTEIN SECONDARY STRUCTURE USING NEURAL NET AND STATISTICAL-METHODS SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE PROTEIN SECONDARY STRUCTURE; NEURAL NETWORKS; PATTERN RECOGNITION; BAYESIAN INFERENCE; MUTUAL INFORMATION ID PATTERN-RECOGNITION; NETWORKS RP STOLORZ, P (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B213,LOS ALAMOS,NM 87545, USA. FU NIGMS NIH HHS [GM 40789-03] NR 22 TC 61 Z9 64 U1 0 U2 5 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 20 PY 1992 VL 225 IS 2 BP 363 EP 377 DI 10.1016/0022-2836(92)90927-C PG 15 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HX080 UT WOS:A1992HX08000011 PM 1593625 ER PT J AU DEMING, TJ NOVAK, BM AF DEMING, TJ NOVAK, BM TI LIVING POLYMERIZATIONS AS MECHANISTIC PROBES - STEREOSELECTION IN THE NICKEL-CATALYZED POLYMERIZATION OF CHIRAL ISOCYANIDES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID ELECTROLYTE SURFACTANT COMPLEXES; POLY(IMINOMETHYLENES); POLYISOCYANIDES; POLYMERS; CHANNEL 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 39 TC 27 Z9 27 U1 0 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 MAY 20 PY 1992 VL 114 IS 11 BP 4400 EP 4402 DI 10.1021/ja00037a056 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA HV675 UT WOS:A1992HV67500056 ER PT J AU KAMIOKA, K CORMIER, RA LUTTON, TW CONNOLLY, JS AF KAMIOKA, K CORMIER, RA LUTTON, TW CONNOLLY, JS TI CHARGE-TRANSFER EMISSION IN MESO-LINKED ZINC PORPHYRIN ANTHRAQUINONE MOLECULES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 NATL RENEWABLE ENERGY LAB,DIV BASIC SCI,PHOTOCONVERS BRANCH,GOLDEN,CO 80401. NR 7 TC 29 Z9 29 U1 0 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 MAY 20 PY 1992 VL 114 IS 11 BP 4414 EP 4415 DI 10.1021/ja00037a065 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HV675 UT WOS:A1992HV67500065 ER PT J AU GEORGE, SJ VANELP, J CHEN, J MA, Y CHEN, CT PARK, JB ADAMS, MWW SEARLE, BG DEGROOT, FMF FUGGLE, JC CRAMER, SP AF GEORGE, SJ VANELP, J CHEN, J MA, Y CHEN, CT PARK, JB ADAMS, MWW SEARLE, BG DEGROOT, FMF FUGGLE, JC CRAMER, SP TI L-EDGE X-RAY ABSORPTION-SPECTROSCOPY OF PYROCOCCUS-FURIOSUS RUBREDOXIN SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID MAGNETIC CIRCULAR-DICHROISM; ELECTRONIC-STRUCTURE; NICKEL; FIELD; STATE C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV GEORGIA,DEPT BIOCHEM,ATHENS,GA 30602. UNIV GRONINGEN,CTR MAT SCI,DEPT APPL & SOLID STATE PHYS,9747 AG GRONINGEN,NETHERLANDS. CATHOLIC UNIV NIJMEGEN,MAT RES INST,6525 ED NIJMEGEN,NETHERLANDS. RI de Groot, Frank/A-1918-2009 NR 23 TC 33 Z9 33 U1 1 U2 6 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 MAY 20 PY 1992 VL 114 IS 11 BP 4426 EP 4427 DI 10.1021/ja00037a073 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HV675 UT WOS:A1992HV67500073 ER PT J AU HIME, A AF HIME, A TI PURSUING THE 17 KEV NEUTRINO SO MODERN PHYSICS LETTERS A LA English DT Review AB Evidence both for and against the existence of a 17 keV neutrino presents an unresolved conundrum. The experimental status is reviewed, emphasizing recent attempts to clarify the issue and thoughts on how the situation might be improved. RP HIME, A (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 0 TC 15 Z9 15 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD MAY 20 PY 1992 VL 7 IS 15 BP 1301 EP 1314 DI 10.1142/S0217732392000975 PG 14 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA HX746 UT WOS:A1992HX74600001 ER PT J AU AOYAMA, H AF AOYAMA, H TI BOREL-SUMMABLE PERTURBATION-SERIES FOR THEORIES WITH DEGENERATE MINIMA SO MODERN PHYSICS LETTERS A LA English DT Article AB We shed new light on the large-order behavior of the perturbation theory for the quantum mechanics with degenerate minima. The dominant contribution at large-order of perturbation is identified as a bounce-like solution of an effective theory in Euclidean path-integral formalism. Based on this observation, we define an improved perturbation theory, which utilizes the symmetry of the theory. It is shown to yield a Borel-summable series. RP AOYAMA, H (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD MAY 20 PY 1992 VL 7 IS 15 BP 1337 EP 1344 DI 10.1142/S0217732392001002 PG 8 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA HX746 UT WOS:A1992HX74600004 ER PT J AU EDBERG, TK PARSONS, A SADOULET, B WEISS, S WILKERSON, J SMITH, G AF EDBERG, TK PARSONS, A SADOULET, B WEISS, S WILKERSON, J SMITH, G TI A 20-ATMOSPHERE IMAGING XENON GAS SCINTILLATION DRIFT CHAMBER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT SYMP ON LIQUID NOBLE GAS DETECTORS AND THEIR APPLICATIONS CY AUG 21-23, 1991 CL MANNE SIEGBAHN INST, STOCKHOLM, SWEDEN SP ROYAL SWEDISH ACAD SCI HO MANNE SIEGBAHN INST ID SHIFTER FIBER READOUT AB We describe the high pressure xenon imaging gas scintillation drift chamber with waveshifting fiber readout, a novel detector for hard X-ray (30 keV to at least 300 keV) observations. This technique promises good energy resolution (24% / square-root E(keV) FWHM), excellent imaging (approximately 200-mu-m FWHM). and very high sensitivity due to large effective area and tow backgrounds. We describe a balloon-borne payload for astrophysical observations based on this concept, called SIGHT (Scintillation Imaging Gas-filled Hard X-rav Telescope). Along with the good energy resolution, SIGHT offers imaging of diffuse sources to 1.5 arc min and 3-sigma-sensitivity as good as 3 X 10(-5)-gamma-cm(-2) s(-1) (line) and 4 X 10(-6)-gamma-cm-2 s-1 keV-1 (continuum) at 70 keV for 10(4) s observing time with a full BGO shield. We finally examine the potential for future evolution of the concept. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP EDBERG, TK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,SPACE SCI LAB,301 LECONTE HALL,BERKELEY,CA 94720, USA. RI Parsons, Ann/I-6604-2012 NR 5 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 20 PY 1992 VL 316 IS 1 BP 38 EP 43 DI 10.1016/0168-9002(92)90222-P PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HY675 UT WOS:A1992HY67500007 ER PT J AU RAHM, DC AF RAHM, DC TI RESPONSE OF LIQUID ARGON AND SOME ADDITIVES TO IONIZING-RADIATION AND THEIR USE IN CALORIMETERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT SYMP ON LIQUID NOBLE GAS DETECTORS AND THEIR APPLICATIONS CY AUG 21-23, 1991 CL MANNE SIEGBAHN INST, STOCKHOLM, SWEDEN SP ROYAL SWEDISH ACAD SCI HO MANNE SIEGBAHN INST ID PHOTOSENSITIVE DOPANTS; IONIZATION AB Measurements on drift velocities and collected charge were made in a small test dewar on liquid argon with admixtures of methane, ethane, ethylene and ammonia using alpha and beta particle sources. In addition a test in the Helios uranium-liquid argon calorimeter was made with a 0.35% addition of methane. The results in the Helios calorimeter showed a worsening of the hadronic resolution and the electron/pion ratio. RP RAHM, DC (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 12 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 20 PY 1992 VL 316 IS 1 BP 67 EP 70 DI 10.1016/0168-9002(92)90227-U PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HY675 UT WOS:A1992HY67500012 ER PT J AU BERDAHL, P MAO, XL READE, RP RUBIN, MD RUSSO, RE YIN, E AF BERDAHL, P MAO, XL READE, RP RUBIN, MD RUSSO, RE YIN, E TI ANGULAR MAGNETORESISTANCE PROVIDES TEXTURE INFORMATION ON HIGH-TC CONDUCTORS SO PHYSICA C LA English DT Article ID O SUPERCONDUCTING FILMS; CRITICAL-FIELD; THIN-FILMS; ANISOTROPY; YBA2CU3OX; LAYERS; STATE AB Angular magnetoresistance measurements are performed by rotating a superconductor to an angle-theta in a fixed magnetic field, while monitoring the resistance R. It is argued theoretically that for fields well above the lower critical field, H much greater than H(cl), the bulk resistivity of the conductor is independent of theta if the crystallites of which it is composed are randomly oriented. Non-random orientation (a key aspect of texture) is revealed, therefore, by variations of R with theta. Dips in R indicate that the field is parallel to the copper oxide planes in a significant fraction of the current-carrying crystallites. C-axis, a-axis, and other textured film conductors are used to illustrate the technique. The angular magnetoresistance is found to be an important supplement to conventional texture determinations by microscopy and X-ray diffraction. RP BERDAHL, P (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 28 TC 6 Z9 6 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 MAY 20 PY 1992 VL 195 IS 1-2 BP 93 EP 102 DI 10.1016/0921-4534(92)90079-R PG 10 WC Physics, Applied SC Physics GA HX870 UT WOS:A1992HX87000012 ER PT J AU DICK, JJ AF DICK, JJ TI SUPERCRITICAL SHEAR IN SHOCKED PENTAERYTHRITOL TETRANITRATE SO APPLIED PHYSICS LETTERS LA English DT Article ID WAVE AB Supercritical shear occurs when the shear stress exceeds the strength of the perfect crystal. An estimate of the theoretical strength of the molecular crystal pentaerythritol tetranitrate is compared to experimental observations of the shock response of this explosive. It is concluded that supercritical shear may be occurring at shock stresses of several GPa in underdriven shocks where there is an elastic wave followed by a slower plastic wave. The induced simultaneous slip on sterically crowded cystallographic planes may be the mechanism for shock initiation of detonation in this explosive, at least in the low stress regime. RP DICK, JJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 16 TC 8 Z9 8 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 18 PY 1992 VL 60 IS 20 BP 2494 EP 2495 DI 10.1063/1.106944 PG 2 WC Physics, Applied SC Physics GA HU947 UT WOS:A1992HU94700016 ER PT J AU STRONGIN, DR MOWLEM, JK RUCKMAN, MW STRONGIN, M AF STRONGIN, DR MOWLEM, JK RUCKMAN, MW STRONGIN, M TI LOW-TEMPERATURE SYNTHESIS OF BORON-NITRIDE FROM CONDENSED DIBORANE AND AMMONIA USING SYNCHROTRON RADIATION SO APPLIED PHYSICS LETTERS LA English DT Article ID EXCITATION; MOLECULES AB Synchrotron radiation was used to form boron nitride from a mixture of diborane (B2H6) and ammonia condensed on a silver substrate at 78 K. Photoemission and near-edge x-ray absorption fine structure results show valence band and near-edge features characteristic of the hexagonal phase of boron nitride. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP STRONGIN, DR (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 19 TC 18 Z9 18 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 18 PY 1992 VL 60 IS 20 BP 2561 EP 2563 DI 10.1063/1.106913 PG 3 WC Physics, Applied SC Physics GA HU947 UT WOS:A1992HU94700039 ER PT J AU FOUCHER, M ALBUQUERQUE, IF BONDAR, NF CARRIGAN, R CHEN, D LI, CZ COOPER, PS DENISOV, AS DOBROVOLSKY, AV DUBBS, T ENDLER, AMF ESCOBAR, CO TANG, FK GOLOVTSOV, VL GORITCHEV, PA GOTTSCHALK, H GOUFFON, P GRACHEV, VT SHI, HZ YAN, J KHANZADEEV, AV KUBANTSEV, MA KUROPATKIN, NP LACH, J LUKSYS, M LEBEDENKO, VN DAI, LS MAHON, JRP MCCLIMENT, E MORELOS, A NEWSOM, C LANG, PF MAIA, MCP SAMSONOV, VM ZHENG, SC SMITH, VJ TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA ZHAO, WH ZHONG, YY LI, YS AF FOUCHER, M ALBUQUERQUE, IF BONDAR, NF CARRIGAN, R CHEN, D LI, CZ COOPER, PS DENISOV, AS DOBROVOLSKY, AV DUBBS, T ENDLER, AMF ESCOBAR, CO TANG, FK GOLOVTSOV, VL GORITCHEV, PA GOTTSCHALK, H GOUFFON, P GRACHEV, VT SHI, HZ YAN, J KHANZADEEV, AV KUBANTSEV, MA KUROPATKIN, NP LACH, J LUKSYS, M LEBEDENKO, VN DAI, LS MAHON, JRP MCCLIMENT, E MORELOS, A NEWSOM, C LANG, PF MAIA, MCP SAMSONOV, VM ZHENG, SC SMITH, VJ TERENTYEV, NK TIMM, S TKATCH, II UVAROV, LN VOROBYOV, AA ZHAO, WH ZHONG, YY LI, YS TI MEASUREMENT OF THE ASYMMETRY PARAMETER IN THE HYPERON RADIATIVE DECAY SIGMA+-]P-GAMMA SO PHYSICAL REVIEW LETTERS LA English DT Article ID WEAK DECAYS; BARYONS AB We have measured the asymmetry parameter (alpha(gamma)) in the hyperon radiative decay SIGMA+ --> p-gamma with a sample of 34754 +/- 212 events obtained in a polarized charged hyperon beam experiment at Fermilab. We find alpha(gamma) = -0.720 +/- 0.086 +/- 0.045, where the quoted errors are statistical and systematic, respectively. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. ST PETERSBURG NUCL PHYS INST,GATCHINA,USSR. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,USSR. UNIV IOWA,IOWA CITY,IA 52242. UNIV SAO PAULO,SAO PAULO,BRAZIL. CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO DE JANEIRO,BRAZIL. CONSELHO NACL PESQUISAS,BR-22290 RIO DE JANEIRO,RJ,BRAZIL. SUNY ALBANY,ALBANY,NY 12222. UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. UNIV FED PARAIBA,PARAIBA,BRAZIL. RP FOUCHER, M (reprint author), YALE UNIV,JW GIBBS LAB,NEW HAVEN,CT 06511, USA. RI Albuquerque, Ivone/H-4645-2012; Gouffon, Philippe/I-4549-2012 OI Albuquerque, Ivone/0000-0001-7328-0136; Gouffon, Philippe/0000-0001-7511-4115 NR 17 TC 34 Z9 35 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 MAY 18 PY 1992 VL 68 IS 20 BP 3004 EP 3007 DI 10.1103/PhysRevLett.68.3004 PG 4 WC Physics, Multidisciplinary SC Physics GA HV189 UT WOS:A1992HV18900008 ER PT J AU ROGERS, PAM COMERFORD, PJ AF ROGERS, PAM COMERFORD, PJ TI EROSION OF THE INCISORS OF SILAGE-FED CATTLE SO VETERINARY RECORD LA English DT Letter C1 TEAGASC,OAKPK RES CTR,CARLOW,IRELAND. RP ROGERS, PAM (reprint author), TEAGASC,GRANGE RES CTR,DUNSANY,MEATH,IRELAND. NR 3 TC 0 Z9 0 U1 0 U2 0 PU BRITISH VETERINARY ASSOC PI LONDON PA 7 MANSFIELD ST, LONDON, ENGLAND W1M 0AT SN 0042-4900 J9 VET REC JI Vet. Rec. PD MAY 16 PY 1992 VL 130 IS 20 BP 455 EP 456 PG 2 WC Veterinary Sciences SC Veterinary Sciences GA HV551 UT WOS:A1992HV55100016 PM 1530736 ER PT J AU ALVES, LC WIEDERIN, DR HOUK, RS AF ALVES, LC WIEDERIN, DR HOUK, RS TI REDUCTION OF POLYATOMIC ION INTERFERENCES IN INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY BY CRYOGENIC DESOLVATION SO ANALYTICAL CHEMISTRY LA English DT Article ID ORGANIC-SOLVENT INTRODUCTION; ANALYTICAL ATOMIC SPECTROMETRY; SAMPLE INTRODUCTION; MEMBRANE INTERFACE; ANALYTICAL PERFORMANCE; EMISSION-SPECTROMETRY; ARGON PLASMAS; OXIDE; LOAD; OPTIMIZATION AB Multiple desolvation steps at -80-degrees-C for a continuous-flow ultrasonic nebulizer reduced the load of water and HCl on an argon Inductively coupled plasma (ICP). Consequently, the oxide ratios MO+/M+ for Ca, Mo, and La were 0.02-0.05%. Polyatomic ion interferences from ArO+, ClO+, and ArCl+ were also reduced by several orders of magnitude. Measured isotope ratios for Ni, Cd, and Fe were in good agreement with accepted natural values, and the detection limits were 2-20 ng L-1 for Ni, Fe, V, As, and Cd in the presence of concentrated matrices of HCI, Ca, or Mo that would normally cause polyatomic ion interference. Eight additional seconds were necessary for sample rinse-out, and analyte sensitivity was reduced by a factor of 2 when cryogenic desolvation was used. UO+/U+ ratios were reduced to 0.06% when cryogenic desolvation was used and acetylene was added to the central channel. Sodium matrices up to 100 mg L-1 decreased the La+ count rate but did not affect the oxide ratio LaO+/La+. At 1000 mg L-1 NaCl the LaO+/La+ ratio increased to 0.08%. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 35 TC 72 Z9 72 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 15 PY 1992 VL 64 IS 10 BP 1164 EP 1169 DI 10.1021/ac00034a016 PG 6 WC Chemistry, Analytical SC Chemistry GA HU710 UT WOS:A1992HU71000017 ER PT J AU CIESIELSKI, C MARIANOS, D OU, CY DUMBAUGH, R WITTE, J BERKELMAN, R GOOCH, B MYERS, G LUO, CC SCHOCHETMAN, G HOWELL, J LASCH, A BELL, K ECONOMOU, N SCOTT, B FURMAN, L CURRAN, J JAFFE, H AF CIESIELSKI, C MARIANOS, D OU, CY DUMBAUGH, R WITTE, J BERKELMAN, R GOOCH, B MYERS, G LUO, CC SCHOCHETMAN, G HOWELL, J LASCH, A BELL, K ECONOMOU, N SCOTT, B FURMAN, L CURRAN, J JAFFE, H TI TRANSMISSION OF HUMAN-IMMUNODEFICIENCY-VIRUS IN A DENTAL PRACTICE SO ANNALS OF INTERNAL MEDICINE LA English DT Article DE HUMAN IMMUNODEFICIENCY VIRUS; HEALTH PERSONNEL; INFECTION CONTROL; DENTISTS; ACQUIRED IMMUNODEFICIENCY SYNDROME ID HEPATITIS-B TRANSMISSION; ORAL SURGEON; OUTBREAK; TYPE-1; AIDS; PROFESSIONALS; INFECTION; BLOOD; RISK AB Objective: To determine if patients of a dentist with the acquired immunodeficiency syndrome (AIDS) became infected with human immunodeficiency virus (HIV) during their dental care and, if so, to identify possible mechanisms of transmission. Design: Retrospective epidemiologic follow-up of the dentist, his office practice, and his former patients. Setting: The practice of a dentist with AIDS in Florida. Participants: A dentist with AIDS, his health care providers and employees, and former patients of the dentist, including eight HIV-infected patients. Measurements: Identification of risks for HIV transmission (if present), degree of genetic relatedness of the viruses, and identification of infection control and other office practices. Results: Five of the eight HIV-infected patients had no confirmed exposures to HIV other than the dental practice and were infected with HIV strains that were closely related to those of the dentist. Each of the five had invasive dental procedures, done by the dentist after he was diagnosed with AIDS. Four of these five patients shared visit days (P > 0.2). Breaches in infection control and other dental office practices to explain these transmissions could not be identified. Conclusion: Although the specific incident that resulted in HIV transmission to these patients remains uncertain, the epidemiologic evidence supports direct dentist-to-patient transmission rather than a patient-to-patient route. C1 CTR DIS CONTROL,NATL CTR PREVENT SERV,DIV ORAL HLTH,ATLANTA,GA 30333. FLORIDA DEPT HLTH & REHAB SERV,W PALM BEACH,FL 33401. FLORIDA DEPT HLTH & REHAB SERV,TALLAHASSEE,FL 32301. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP CIESIELSKI, C (reprint author), CTR DIS CONTROL,DIV HIV AIDS,1600 CLIFTON RD NE,ATLANTA,GA 30333, USA. NR 49 TC 170 Z9 173 U1 1 U2 9 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD MAY 15 PY 1992 VL 116 IS 10 BP 798 EP 805 PG 8 WC Medicine, General & Internal SC General & Internal Medicine GA HT802 UT WOS:A1992HT80200003 PM 1567094 ER PT J AU GINOCCHIO, JN LEVIATAN, A AF GINOCCHIO, JN LEVIATAN, A TI NEUTRON PROTON COLLECTIVE MOTION .1. NUCLEAR SHAPES SO ANNALS OF PHYSICS LA English DT Article ID INTERACTING-BOSON MODEL; DIPOLE EXCITATION MODE; CLASSICAL LIMIT; O(6) LIMIT; M1 MODE; STATES; DEFORMATIONS; ENERGY; IBA-2 RP GINOCCHIO, JN (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 39 TC 18 Z9 18 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD MAY 15 PY 1992 VL 216 IS 1 BP 152 EP 197 DI 10.1016/0003-4916(52)90045-6 PG 46 WC Physics, Multidisciplinary SC Physics GA HV116 UT WOS:A1992HV11600006 ER PT J AU SUMPTER, BG NOID, DW AF SUMPTER, BG NOID, DW TI POTENTIAL-ENERGY SURFACES FOR MACROMOLECULES - A NEURAL NETWORK TECHNIQUE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DYNAMICS AB A method for obtaining potential energy surfaces for macromolecules is described. The basis of the method is the use of a neural network to learn the relationship between vibrational spectra and a multidimensional potential energy surface (PES). The results demonstrate that the neural network is capable of mapping the vibrational motion determined from spectra onto a fully coupled PES with relatively high levels of accuracy. C1 UNIV TENNESSEE, DEPT CHEM, KNOXVILLE, TN 37996 USA. RP OAK RIDGE NATL LAB, DIV CHEM, OAK RIDGE, TN 37831 USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 33 TC 36 Z9 36 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 15 PY 1992 VL 192 IS 5-6 BP 455 EP 462 DI 10.1016/0009-2614(92)85498-Y PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HV766 UT WOS:A1992HV76600003 ER PT J AU DAVIS, MJ AF DAVIS, MJ TI SMOOTHED EIGENSTATES FROM MOLECULAR-SPECTRA SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DYNAMICS AB A means to understand smoothed spectral features is presented here. This technique is based on the generation of a hierarchical tree from a molecular spectrum. The tree is then used to choose superpositions of eigenstates which can be associated with smoothed features of the spectrum. These "smoothed eigenstates" allow for the assignment of spectral features. The method can be directly applied to time-independent calculations without any time evolution. It should also be useful for understanding the eigenstates of multidimensional potential surfaces without reference to any particular molecular spectrum. RP DAVIS, MJ (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 25 TC 25 Z9 25 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 MAY 15 PY 1992 VL 192 IS 5-6 BP 479 EP 485 DI 10.1016/0009-2614(92)85502-2 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HV766 UT WOS:A1992HV76600007 ER PT J AU AMATO, A FEYERHERM, R GYGAX, FN SCHENCK, A WEBER, M CASPARY, R HELLMANN, P SCHANK, C GEIBEL, C STEGLICH, F MACLAUGHLIN, DE KNETSCH, EA HEFFNER, RH AF AMATO, A FEYERHERM, R GYGAX, FN SCHENCK, A WEBER, M CASPARY, R HELLMANN, P SCHANK, C GEIBEL, C STEGLICH, F MACLAUGHLIN, DE KNETSCH, EA HEFFNER, RH TI MAGNETIC AND SUPERCONDUCTING PROPERTIES OF THE HEAVY-FERMION SUPERCONDUCTOR UPD2AL3 SO EUROPHYSICS LETTERS LA English DT Article DE HEAVY-FERMION SUPERCONDUCTORS; VALENCE FLUCTUATIONS, KONDO LATTICE AND HEAVY FERMIONS; MUON SPIN ROTATION AND RELAXATION ID CECU2SI2; FIELDS; UPT3 AB Zero- and transverse-field muon-spin rotation (mu+ SR) spectroscopy, as well as critical-field investigations were performed on the newly discovered antiferromagnetic superconductor UPd2Al3. In contrast to the situation in UNi2Al3, no spontaneous frequency could be observed in the zero-field spectroscopy, suggesting a symmetric muon stopping site. The coexistence between magnetism and superconductivity could unambiguously be confirmed by the mu+ SR data. The magnetic-penetration depth lambda(0) has been obtained from the increase of the mu+ SR line width below T(c) and from the slopes of the critical field at T(c). The results are compatible with a value of lambda(0) = (6250 +/- 1250) A and suggest that UPd2Al3 is a BCS-type weak-coupling superconductor. C1 TH DARMSTADT,INST FESTKORPERPHYS,W-6100 DARMSTADT,GERMANY. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. LEIDEN UNIV,KAMERLINGH ONNES LAB,2300 RA LEIDEN,NETHERLANDS. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP AMATO, A (reprint author), ETH ZURICH,INST MITTELENERGIEPHYS,CH-5232 VILLIGEN,SWITZERLAND. RI Feyerherm, Ralf/F-5487-2013; Amato, Alex/H-7674-2013 OI Feyerherm, Ralf/0000-0003-3034-4210; Amato, Alex/0000-0001-9963-7498 NR 15 TC 38 Z9 38 U1 1 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAY 15 PY 1992 VL 19 IS 2 BP 127 EP 133 DI 10.1209/0295-5075/19/2/012 PG 7 WC Physics, Multidisciplinary SC Physics GA HX476 UT WOS:A1992HX47600012 ER PT J AU KOWLURU, A KOWLURU, RA AF KOWLURU, A KOWLURU, RA TI PREFERENTIAL EXCRETION OF GLYCATED ALBUMIN IN C57BL-KS-J MICE - EFFECTS OF DIABETES SO EXPERIENTIA LA English DT Article DE C57BL-KS-J MICE; DB/DB MICE; GLYCATED ALBUMIN; URINARY EXCRETION ID GLOMERULAR BASEMENT-MEMBRANE; MICROALBUMINURIA AB Urinary excretion of glycated albumin was quantitated in genetically hyperglycemic mice (C57BL-Ks-J, db/db mice), a model for non-insulin-dependent diabetes mellitus, and compared with their non-diabetic littermates. The data indicated a preferential excretion of glycated albumin in non-diabetic mice. This phenomenon of 'editing' of glycated albumin is decreased significantly in diabetic mice. Quantitative measurements of overall excretion of glycated albumin suggested that the loss of editing in diabetic mice is due to the dilution of glycated albumin by the unmodified albumin which is excreted in large amounts in diabetic mice. Therefore, the loss of editing observed in this model resembled the one we characterized in insulin-dependent diabetic humans and a streptozotocin-diabetic rat model 3. RP KOWLURU, A (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. NR 23 TC 2 Z9 2 U1 0 U2 0 PU BIRKHAUSER VERLAG AG PI BASEL PA PO BOX 133 KLOSTERBERG 23, CH-4010 BASEL, SWITZERLAND SN 0014-4754 J9 EXPERIENTIA JI Experientia PD MAY 15 PY 1992 VL 48 IS 5 BP 486 EP 488 DI 10.1007/BF01928169 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HX600 UT WOS:A1992HX60000012 PM 1601114 ER PT J AU LUFT, BJ PAWAGI, S JIANG, W FISEENE, S GOREVIC, PD DUNN, J AF LUFT, BJ PAWAGI, S JIANG, W FISEENE, S GOREVIC, PD DUNN, J TI ANALYSIS AND EXPRESSION OF THE BORRELIA-BURGDORFERI P/GAU FLA GENE - IDENTIFICATION OF HETEROGENEITY WITH THE B31 STRAIN SO FEMS MICROBIOLOGY LETTERS LA English DT Article DE BORRELIA-BURGDORFERI; FLAGELLIN, P/GAU ID LYME-DISEASE; ANTIBODIES; FLAGELLUM AB The flagellin gene from the P/Gau strain of Borrelia burgdorferi was cloned and sequenced. The translated P/Gau flagellin protein differed from the flagellin of the B31 strain at 13 of 336 amino acids. This includes seven differences between amino acids 190-234, an immunodominant and specific region for B. burgdorferi. The entire flagellin molecule, as well as peptides of the internal portion of the protein which is more specific for B. burgdorferi, has been expressed in Escherichia coli using a pET7HIS.2 expression system. These peptides may be of great value for the development of sensitive and specific recombinant-based serological assays. C1 BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. RP LUFT, BJ (reprint author), SUNY STONY BROOK, HLTH SCI CTR, DEPT MED, T-15, ROOM 080, STONY BROOK, NY 11794 USA. OI Luft, Benjamin/0000-0001-9008-7004 NR 16 TC 5 Z9 5 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0378-1097 EI 1574-6968 J9 FEMS MICROBIOL LETT JI FEMS Microbiol. Lett. PD MAY 15 PY 1992 VL 93 IS 1 BP 63 EP 67 DI 10.1016/0378-1097(92)90490-F PG 5 WC Microbiology SC Microbiology GA HV847 UT WOS:A1992HV84700011 ER PT J AU SCHEWEMILLER, I BOTTCHER, P AF SCHEWEMILLER, I BOTTCHER, P TI TERNARY TELLURIDES WITH W5SI3 TYPE-STRUCTURE MXK4TE3 (M=CA, SR) SO JOURNAL OF ALLOYS AND COMPOUNDS LA German DT Article ID CRYSTAL-STRUCTURE AB Single crystals of MxK4Te3 (M = Ca, Sr; x = 0.6 +/- 0. 1) have been synthesized from mixtures of MTe, K2Te and tellurium. The black products are semiconducting compounds (E(g) = 1.0 +/- 0.2 eV). Depending on the particular details of the syntheses the single crystals either show superstructure reflections or they do not. The substructure of both compounds is of the W5Si3 type (space group I4/mcm). The cell constants of CaxK4Te3 [SrxK4Te3] are: a = 13.662(1) angstrom [13.672(1) angstrom]; c = 6.273(2) angstrom [6.313(1) angstrom]. The alkaline earth metals M are situated in the centers of tellurium tetrahedra which are interconnected via common edges along c: 1/finity[MxTe4/2]. Very short M-M distances are found (d(M-M) = c/2). Therefore the M atom sites are only partly occupied and some of the M atoms are displaced out of the centers of the tetrahedra. We show that this displacement is responsible for the observed incommensurate superstructure. C1 UNIV DUSSELDORF,W-4000 DUSSELDORF 1,GERMANY. RP SCHEWEMILLER, I (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 11 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD MAY 15 PY 1992 VL 183 BP 98 EP 108 DI 10.1016/0925-8388(92)90734-Q PG 11 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HZ698 UT WOS:A1992HZ69800012 ER PT J AU LAWSON, AC CONANT, JW ROBERTSON, R ROHWER, RK YOUNG, VA TALCOTT, CL AF LAWSON, AC CONANT, JW ROBERTSON, R ROHWER, RK YOUNG, VA TALCOTT, CL TI DEBYE-WALLER FACTORS OF PDD(X) MATERIALS BY NEUTRON POWDER DIFFRACTION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID PDHX; PDDX AB We have completed a neutron powder diffraction study of four PdD(x) materials: palladium metal, alpha-PdD(x) and two samples of beta-PdD0.6. We measured the lattice constants and Debye-Waller factors at several temperatures between 15 and 300 K. This information was analyzed to yield thermal expansion data and atom-specific Debye temperatures for each of the samples. We were unable to locate the deuterium atoms in alpha-PdD(x). RP LAWSON, AC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 10 Z9 10 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD MAY 15 PY 1992 VL 183 BP 174 EP 180 DI 10.1016/0925-8388(92)90742-R PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HZ698 UT WOS:A1992HZ69800020 ER PT J AU FISK, Z MAPLE, MB AF FISK, Z MAPLE, MB TI ON THE EXISTENCE OF HEAVY FERMION YTTERBIUM COMPOUNDS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID MAGNETIC-SUSCEPTIBILITY; INTERMETALLIC COMPOUNDS; PHASE-TRANSITIONS; SUPERCONDUCTIVITY; METALS; CERIUM; STATE; GAP AB Evidence for heavy fermion behavior in ytterbium compounds is examined. C1 LOS ALAMOS NATL LAB,INST PURE & APPL PHYS SCI,LOS ALAMOS,NM 87544. RP FISK, Z (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87544, USA. NR 47 TC 45 Z9 45 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD MAY 15 PY 1992 VL 183 BP 303 EP 311 DI 10.1016/0925-8388(92)90754-W PG 9 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HZ698 UT WOS:A1992HZ69800032 ER PT J AU MILLER, LL SUN, K JOHNSTON, DC SCHIRBER, JE FISK, Z AF MILLER, LL SUN, K JOHNSTON, DC SCHIRBER, JE FISK, Z TI HEAT-CAPACITY (150-300-K) AND ANISOTROPIC MAGNETIC-SUSCEPTIBILITY (5-300-K) OF SINGLE-CRYSTAL LA2CUO4+X SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID PHASE-SEPARATION; SUPERCONDUCTING SUPEROXIDE; ANTIFERROMAGNET LA2CUO4; SPIN DYNAMICS; NORMAL-STATE; TC; YBA2CU3O7; LA2-XBAXCUO4; DEPENDENCE; OXIDES AB Heat capacity measurements from 150 to 300 K were carried out on a single crystal of La2CuO4+x synthesized by subjecting an La2CuO4 crystal to 3 kbar oxygen pressure at 575-degrees-C. The data reveal three small (about 1%) anomalies at temperatures (T) of 206, 222 and 259 K. The first two are tentatively attributed to CuO inclusions in the crystal. The third is observed on warming, but not on cooling, and is attributed to the previously documented first-order transition from the orthorhombically distorted K2NiF4 structure to a low T mixture of nearly stoichiometric La2CuO4 and oxygen-rich superconducting La2CuO4+y (y > x). The size of the anomaly at 259 K is about one-seventh of that observed previously for a single crystal of La2CuO4 at the second-order tetragonal-to-orthorhombic phase transition temperature of about 530 K. Magnetization measurements from 5 to 300 K and from 50 G to 50 kG are also reported for the La2CuO4+x crystal. The normal state magnetic susceptibility chi(T) is quite anisotropic, with chi(T) for H perpendicular to the CuO2 layers (chi(c)) in good agreement with previous data on a different, but similarly prepared, crystal. The anisotropy in chi is nearly independent of T from 40 to 300 K and the magnitude of chi(c)-chi(ab) per CuO2 layer is very similar to that at high T in YBa2Cu3O6.1, La2CuO4, Sr2CuO2Cl2 and La2-xMxCuO4 (M = Sr, Ba). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MILLER, LL (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 53 TC 5 Z9 5 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD MAY 15 PY 1992 VL 183 BP 312 EP 324 DI 10.1016/0925-8388(92)90755-X PG 13 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HZ698 UT WOS:A1992HZ69800033 ER PT J AU GRADY, DE MASHIMO, T AF GRADY, DE MASHIMO, T TI SHOCK AND RELEASE WAVE PROPERTIES OF YTTRIA-DOPED TETRAGONAL AND CUBIC ZIRCONIA SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Velocity interferometry diagnostics are used to monitor transmitted compressive shock and release waves in yttria (Y2O3)-stabilized tetragonal and cubic zirconia. In tetragonal zirconia compressive yielding due to lattice slip or lattice instability is observed at 13-17 GPa and again at 30-31 GPa. This represents an additional fine structure to the dynamic compression of zirconia that has not previously been observed. A correlation with initial sample density is seen for the lower-amplitude yield. A single yield over the range of the data occurs at 5-6 GPa for cubic zirconia. Approximately 4%-6% porosity in the cubic zirconia accounts for initial yield somewhat lower than earlier studies. From unloading wave profile measurements, initial release wave velocities at the Hugoniot state and stress derivatives of these data are determined. Release moduli data increase monotonically over a Hugoniot stress range of 11-45 GPa. A stress derivative of this data of K'(l) = 1.85 is obtained. Stress derivatives determined directly from the initial release slope of individual profiles are significantly higher and suggest deformation or phase transformation kinetics on release. Release waves from Hugoniot states of 11-13 GPa suggest formation of a rarefaction shock and may imply a dynamic stress-induced transformation not indicated by the shock profile. A tensile spall strength of 1.6 GPa was determined for the tetragonal zirconia. This high value may be related to the large fracture toughness of this transformation-toughened ceramic. C1 KUMAMOTO UNIV,HIGH ENERGY RATE LAB,KUMAMOTO 860,JAPAN. RP GRADY, DE (reprint author), SANDIA NATL LABS,DIV EXPTL IMPACT PHYS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 16 Z9 16 U1 1 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 MAY 15 PY 1992 VL 71 IS 10 BP 4868 EP 4874 DI 10.1063/1.350631 PG 7 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100031 ER PT J AU ERSKINE, DJ NELLIS, WJ AF ERSKINE, DJ NELLIS, WJ TI SHOCK-INDUCED MARTENSITIC-TRANSFORMATION OF HIGHLY ORIENTED GRAPHITE TO DIAMOND SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PHASE-TRANSITION; TOTAL-ENERGY; CARBON; COMPRESSION AB Shock-wave profiles of highly ordered pyrolytic graphite shocked normal to the basal plane of the graphite crystal structure have been measured. For graphite with sufficient orientational order a martensitic transformation to a diamond-like phase is observed with a transition onset pressure 19.6 +/- 0.7 GPa, the stability limit of the graphite structure under shock compression. The minimum overpressure required for the transformation is not more than 6 GPa and the two-wave structure of the transition is overdriven to a single wave above 40 GPa. RP ERSKINE, DJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 34 TC 72 Z9 73 U1 1 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1992 VL 71 IS 10 BP 4882 EP 4886 DI 10.1063/1.350633 PG 5 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100033 ER PT J AU MIRKARIMI, PB SHINN, M BARNETT, SA KUMAR, S GRIMSDITCH, M AF MIRKARIMI, PB SHINN, M BARNETT, SA KUMAR, S GRIMSDITCH, M TI ELASTIC PROPERTIES OF TIN/(VXNB1-X)N SUPERLATTICES MEASURED BY BRILLOUIN-SCATTERING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID COMPOSITION-MODULATED ALLOYS; SURFACE ACOUSTIC-WAVES; THIN-FILMS; METALLIC SUPERLATTICES; V SUPERLATTICES; SUPER-LATTICES; CONSTANTS; MODULUS; NICKEL; FOILS AB Brillouin scattering measurements have been carried out on single-crystal lattice-matched TiN/(V0.6Nb0.4)N and mismatched TiN/NbN superlattices. Measured surface wave velocities were found to be independent of superlattice wavelength over the entire range investigated, 1.5-30 nm, and were averages of the measured velocities of pure homogeneous TiN, NbN, and (V0.6Nb0.4)N. These results indicate that there is no anomaly in the C44 elastic constant. X-ray diffraction results from the superlattices indicated that the average lattice spacing did not vary with wavelength. This is consistent with previous observations where elastic anomalies were related to changes in lattice spacing. The absence of a correlation between the C44 elastic constant and previously reported hardness enhancements indicates that the latter are not caused by anomalies in C44; they could, however, be correlated with other elastic moduli. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP MIRKARIMI, PB (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Barnett, Scott/B-7502-2009 NR 34 TC 42 Z9 42 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1992 VL 71 IS 10 BP 4955 EP 4958 DI 10.1063/1.350644 PG 4 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100045 ER PT J AU SEAGER, CH VENTURINI, EL SCHUBERT, WK AF SEAGER, CH VENTURINI, EL SCHUBERT, WK TI SPIN-DEPENDENT TRANSPORT AT SILICON GRAIN-BOUNDARIES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INTERFACE STATES; RECOMBINATION; RESONANCE; CENTERS; WAFERS; FREQUENCY; JUNCTION AB The transport of electronic carriers across grain boundaries in n- and p-type silicon has been measured as a function of magnetic field in the presence of a microwave field. The spin-dependent-transport (SDT) signal is observed to have a distinctively different character depending on whether the samples are illuminated with band-gap light or are in the dark. Despite the approximate symmetry of the dark I-V curves, the dark SDT signals, which are only observed for n-type boundaries, are asymmetric, displaying an increased impedance at the resonance condition for one current direction and a decrease for the other. With band-gap illumination, a symmetric SDT signal is seen for all samples which becomes quite large at high light intensities. The line shapes and g values seen for these resonances are similar to those attributed to Si dangling-bond-like defects. The dark SDT effect may be associated with a spin-flip k-vector change which must take place for conduction-band electrons that are thermionically emitted over the grain-boundary double depletion layer. The light-induced SDT effect is well modeled as a spin-dependent change of the light-generated minority carrier flux that modulates the trapped majority-carrier density at the grain-boundary plane. RP SEAGER, CH (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 30 TC 8 Z9 8 U1 1 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 MAY 15 PY 1992 VL 71 IS 10 BP 5059 EP 5069 DI 10.1063/1.350607 PG 11 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100060 ER PT J AU MCELFRESH, M MILLER, TG SCHAEFER, DM REIFENBERGER, R MUENCHAUSEN, RE HAWLEY, M FOLTYN, SR WU, XD AF MCELFRESH, M MILLER, TG SCHAEFER, DM REIFENBERGER, R MUENCHAUSEN, RE HAWLEY, M FOLTYN, SR WU, XD TI CORRELATION OF SURFACE-TOPOGRAPHY AND FLUX PINNING IN SUPERCONDUCTING YBACUO FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CRITICAL CURRENTS; SINGLE-CRYSTAL; YBA2CU3O7-DELTA; DEPOSITION; LINE AB The surface topography of YBa2Cu3O7 thin films prepared by pulsed laser deposition is studied by atomic force microscopy and scanning tunneling microscopy. The possible contributions from observed structural features to the critical current density J(c) are discussed. It is shown that the contribution of the screw dislocations associated with some structures can be either repulsive or attractive, depending on the dominant pinning mechanism. At low magnetic fields (to about 0.25 kOe) these dislocations can account for the observed critical current density values (J(c) > 10(11) A/m2) while for larger fields the higher-density steplike growth structures can account for significant values of J(c). It is shown that the pinning strength associated with pinning at steps varies inversely with thickness. C1 LOS ALAMOS NATL LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. RP MCELFRESH, M (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. NR 28 TC 37 Z9 37 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 MAY 15 PY 1992 VL 71 IS 10 BP 5099 EP 5102 DI 10.1063/1.350612 PG 4 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100065 ER PT J AU SCHROTH, GP SIINO, JS COONEY, CA THNG, JPH HO, PS BRADBURY, EM AF SCHROTH, GP SIINO, JS COONEY, CA THNG, JPH HO, PS BRADBURY, EM TI INTRINSICALLY BENT DNA FLANKS BOTH SIDES OF AN RNA POLYMERASE-I TRANSCRIPTION START SITE - BOTH REGIONS DISPLAY NOVEL ELECTROPHORETIC MOBILITY SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID CURVED DNA; PHYSARUM-POLYCEPHALUM; ESCHERICHIA-COLI; KINETOPLAST DNA; REPLICATION ORIGIN; REGULATORY REGION; BACILLUS-SUBTILIS; SALT DEPENDENCE; THYMINE TRACTS; GEL MIGRATION AB We have identified two intrinsically bent regions of DNA which flank the transcription start site of the rRNA gene from Physarum polycephalum. DNA fragments from both regions were analyzed by circular permutation polyacrylamide gel electrophoresis assay and computer modeling. Both types of analysis indicate that one fragment contains a relatively simple bend centered about 160 base pairs (bp) upstream of the transcription start site while the other fragment contains multiple bends, the most prominent of which is centered about 150 bp downstream of the start site. According to both gel mobilities and computer modeling we estimate that the net bending in each is about 45-degrees. These fragments were studied in detail by varying parameters of electrophoresis that are known to affect bending. Previous work indicates that anomalous mobility should decrease when temperature or ethidium bromide concentration is increased, whereas anomalous mobility should increase when polyacrylamide gel percentage is increased. The anomalous mobility of both fragments decreases as temperature is raised from 4 to 65-degrees-C, although the bent structure centered at - 160 bp is more temperature labile than the bend at + 150 bp. Strikingly different behavior was observed for the two fragments as the polyacrylamide concentration was varied. As polyacrylamide concentrations are increased from 6 to 10%, the anomalous mobility of the bend centered at - 160 bp increases while that of the bend centered at + 150 bp decreases. The bend centered at + 150 bp is "straightened" at all ethidium concentrations tested. In sharp contrast and unexpectedly, the anomalous migration of the bend centered at - 160 bp increases dramatically in 0.1-mu-g/ml ethidium bromide. Many of the mobility differences we observe suggest that the two regions studied represent structurally distinct forms of bent DNA. The location of these strongly bent regions on either side of a RNA polymerase I transcription start site suggests important roles for such structures in chromatin structure and transcription initiation. C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. CITY HOPE NATL MED CTR,BECKMAN RES INT,DEPT BIOL,DUARTE,CA 91010. UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP SCHROTH, GP (reprint author), OREGON STATE UNIV,DEPT BIOCHEM & BIOPHYS,535 WENIGER HALL,CORVALLIS,OR 97331, USA. RI Ho, Pui/F-6186-2014; OI Ho, Pui/0000-0002-8082-4311; Cooney, Craig/0000-0003-4279-557X FU NIA NIH HHS [R01AG08196]; NIGMS NIH HHS [GM-26901] NR 81 TC 36 Z9 36 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 MAY 15 PY 1992 VL 267 IS 14 BP 9958 EP 9964 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HT965 UT WOS:A1992HT96500078 PM 1577826 ER PT J AU NORTHRUP, FJ WU, M SEARS, TJ AF NORTHRUP, FJ WU, M SEARS, TJ TI MEASUREMENT OF (00V3) LEVELS IN X2-PI NCO BY STIMULATED-EMISSION PUMPING SPECTROSCOPY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FERMI-RESONANCE; SPIN-ORBIT; MICROWAVE SPECTROSCOPY; SUPERSONIC EXPANSION; RENNER-TELLER; FLUORESCENCE; VIBRATION; SPECTRUM; SYSTEM; STATE AB Laser induced fluorescence measurements of NCO formed in the reaction CN + O2 --> NCO + O in a free jet expansion are reported. The rotational temperature achieved in the experiments was typically 10-15 K and absorption from vibrationally excited levels was very much reduced in intensity. Two bands in the A-X system, the v1, v2, v3 = 200-000 and 120-000, of the radical were rotationally resolved for the first time, and wavelength resolved laser excited fluorescence measurements have been used to characterize many ground state vibronic energy levels below 6000 cm-1 in energy. Stimulated emission pumping experiments were carried out on vibronic levels associated with the v3 vibration with 1 less-than-or-equal-to v3 less-than-or-equal-to 3 in the electronic ground state. Harmonic and anharmonic constants were determined, together with the spin-orbit coupling parameters and rotational constants for these levels. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 38 TC 26 Z9 28 U1 3 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 MAY 15 PY 1992 VL 96 IS 10 BP 7218 EP 7228 DI 10.1063/1.462426 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HU557 UT WOS:A1992HU55700002 ER PT J AU SIGGEL, MRF HAYES, MA MACDONALD, MA WEST, JB DEHMER, JL PARR, AC HARDIS, JE IGA, I TIIT, V AF SIGGEL, MRF HAYES, MA MACDONALD, MA WEST, JB DEHMER, JL PARR, AC HARDIS, JE IGA, I TIIT, V TI RESONANCE EFFECTS IN THE 5-SIGMA-1 PHOTOIONIZATION CHANNEL OF CO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID VIBRATIONAL INTENSITY DISTRIBUTIONS; MOLECULAR PHOTO-IONIZATION; ANGULAR-DISTRIBUTION; CROSS-SECTIONS; BRANCHING RATIOS; PHOTOELECTRON-SPECTRUM; SYNCHROTRON RADIATION; CARBON-MONOXIDE; N-2; N2 AB Vibrational branching ratios and photoelectron angular distributions are reported for the 5-sigma-1 photoionization channel of CO in the range 16 eV < hv < 45 eV. Striking non-Franck-Condon effects are observed in both the branching ratios and angular distributions as a result of various autoionizing states and a sigma-shape resonance that lie in this spectral range. The goal of the present measurement was to observe definitive evidence for the sigma-shape resonance via its non-Franck-Condon effects on the vibrational ionization channels. Guided by recent calculations [ Smith, Lynch, and McKoy, J. Chem. Phys. 85, 6455 (1986) ], we examined the broad structure in the vibrational branching ratios and angular distributions in the range 25 eV < hv < 40 eV. There, we found clear evidence for the sigma-shape resonance in the quantities beta(upsilon+ = 0 and 1) and sigma(upsilon+ = 2)/sigma(upsilon+ = 0). Substantial differences between theory and experiment for the sigma(upsilon+ = 1)/sigma(upsilon+ = 0) branching ratio, however, serve to define the limitations of the current single-channel picture for this process. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. UNIV FED SAO CARLOS,DEPT QUIM,BR-13560 SAO CARLOS,SP,BRAZIL. TARTU PHYS INST,202400 TARTU,ESTONIA,USSR. RP SIGGEL, MRF (reprint author), SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. RI Iga, Ione/C-1273-2015 NR 50 TC 19 Z9 19 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1992 VL 96 IS 10 BP 7433 EP 7439 DI 10.1063/1.462393 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HU557 UT WOS:A1992HU55700023 ER PT J AU KUDLA, K KOURES, AG HARDING, LB SCHATZ, GC AF KUDLA, K KOURES, AG HARDING, LB SCHATZ, GC TI A QUASI-CLASSICAL TRAJECTORY STUDY OF OH ROTATIONAL-EXCITATION IN OH+CO COLLISIONS USING ABINITIO POTENTIAL SURFACES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STATES; KINETICS; X2-PI AB We have performed large basis set configuration interaction calculations to characterize the two potential surfaces (2A' and 2A") which correlate to the ground state of OH + CO. Only planar geometries of the four atoms are considered, and the calculations restrict the OH and CO bond distances to their isolated diatomic values. Global representations of these potential surfaces have been developed and used in quasiclassical trajectory studies of rotational excitation in low energy (1-6 kcal/mol) collisions of OH and CO in their respective rovibrational ground states. We find that the collisional excitation cross sections are about equal for the two surfaces, and there is a monotonic increase in each cross section with translational energy. For OH rotational quantum numbers N between 2 and 6 there is approximately a factor of 2-3 decrease in the cross section for each unit increase in N. The energy and N dependence of these cross sections are generally in excellent agreement with recent experiments. We have also explored the sensitivity of these cross sections to the nature of the potential energy surface, and we have used a surface that describes the formation of the intermediate complex HOCO to determine sensitivity of the rotationally inelastic cross sections to complex formation. In agreement with the experiments, we find that the low energy, high N cross sections are appreciably perturbed by complex formation. C1 ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439. ALLIED SIGNAL R&T,DES PLAINES,IL 60017. RP KUDLA, K (reprint author), NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208, USA. NR 24 TC 53 Z9 53 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1992 VL 96 IS 10 BP 7465 EP 7473 DI 10.1063/1.462397 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HU557 UT WOS:A1992HU55700028 ER PT J AU LEE, MT WANG, KH MCKOY, V TONKYN, RG WIEDMANN, RT GRANT, ER WHITE, MG AF LEE, MT WANG, KH MCKOY, V TONKYN, RG WIEDMANN, RT GRANT, ER WHITE, MG TI ION ROTATIONAL DISTRIBUTIONS FOR NEAR-THRESHOLD PHOTOIONIZATION OF H2O SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID ENHANCED MULTIPHOTON IONIZATION; PHOTOELECTRON-SPECTROSCOPY; BRANCHING RATIOS; CROSS-SECTIONS; NO; ENERGY C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. UNIV FED SAO CARLOS,DEPT QUIM,BR-13560 SAO CARLOS,SP,BRAZIL. RP LEE, MT (reprint author), CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,PASADENA,CA 91125, USA. NR 23 TC 47 Z9 47 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 MAY 15 PY 1992 VL 96 IS 10 BP 7848 EP 7851 DI 10.1063/1.462381 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HU557 UT WOS:A1992HU55700065 ER PT J AU DEBSIKDAR, JC SOWEMIMO, OS AF DEBSIKDAR, JC SOWEMIMO, OS TI SOME CHARACTERISTICS OF BARIUM HEXA-ALUMINATE CELSIAN COMPOSITES SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID INDENTATION RP DEBSIKDAR, JC (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 7 TC 2 Z9 2 U1 1 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD MAY 15 PY 1992 VL 11 IS 10 BP 637 EP 638 DI 10.1007/BF00728889 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA HW171 UT WOS:A1992HW17100005 ER PT J AU SLUITER, M TURCHI, PEA PINSKI, FJ STOCKS, GM AF SLUITER, M TURCHI, PEA PINSKI, FJ STOCKS, GM TI A 1ST-PRINCIPLES STUDY OF PHASE-STABILITY IN NI-AL AND NI-TI ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET ID TRANSITION-METAL ALLOYS; SHORT-RANGE ORDER; SCATTERING; TRANSFORMATION; DIAGRAMS; NI3AL AB The thermodynamic stability of the b.c.c.- and f.c.c.-based ordered phases of Ni-Ti and Ni-Al has been studied with a highly accurate first-principles electronic structure method. The occurrence of a martensitic transformation in Ni-Al B2 ordered intermetallic alloys will be discussed and related to the existence of intermediate structures between b.c.c.- and f.c.c.-based phases. It will be shown that closely related ordered structures can exist on f.c.c. and b.c.c. lattices in thc composition range where the transformation occurs. A variety of antiphase boundaries in the B2 and L12 structures will be examined and the pertinent energies will be compared with experimental data. In addition, the rather unusual appearance of the Ni-Ti B2 ordered structure in the phase diagram will be discussed. C1 UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP SLUITER, M (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,L-268,POB 808,LIVERMORE,CA 94550, USA. RI Sluiter, Marcel/E-6086-2010; Stocks, George Malcollm/Q-1251-2016 OI Sluiter, Marcel/0000-0002-6514-4318; Stocks, George Malcollm/0000-0002-9013-260X NR 44 TC 31 Z9 31 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 1 EP 8 DI 10.1016/0921-5093(92)90038-3 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800002 ER PT J AU BRIMHALL, JL CHARLOT, LA BRUEMMER, SM AF BRIMHALL, JL CHARLOT, LA BRUEMMER, SM TI PHASE-STABILITY IN BE-NB AND BE-NB-ZR INTERMETALLICS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET AB Sputter deposition of Be-Nb alloys at low temperatures (30-degrees-C) produces an amorphous phase for compositions of greater than 5 at.% Nb. A metastable crystalline phase which can be considered a highly faulted form of the Be12Nb occurs at higher deposition temperatures or by low temperature annealing of the amorphous phase. Because of structural similarities, this metastable phase is a precursor to the formation of either Be12Nb or Be17Nb2 upon high temperature annealing. There was no evidence of the Be5Nb phase which has been postulated on some phase diagrams. The Be12Nb phase can accommodate considerable zirconium in the structure and the Be13Zr can accommodate niobium in its structure. The Be13Zr becomes the predominant phase when the Zr/Nb composition ratio is greater than unity. High temperature annealing of the ternary results in dual-phase regions of Be12(Nb,Zr)+Be17(NbZr)2 or Be13(Zr,Nb)+Be17 (Zr,Nb)2, but the coexistence of Be12(Nb,Zr)+Be13(Zr,Nb)has not been observed. RP BRIMHALL, JL (reprint author), PACIFIC NW LAB, POB 999, M-S P8-16, RICHLAND, WA 99352 USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 76 EP 80 DI 10.1016/0921-5093(92)90049-7 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800013 ER PT J AU ALEXANDER, DJ SIKKA, VK AF ALEXANDER, DJ SIKKA, VK TI MECHANICAL-PROPERTIES OF ADVANCED NICKEL ALUMINIDES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET AB The mechanical properties of two nickel aluminide alloys have been studied over a range of temperatures. Testing included tensile. impact, and fracture toughness testing. The wrought alloy was studied in cold-worked and cold-worked plus annealed conditions. The cast alloy was studied in the as-cast condition. At room temperature, the annealed wrought alloy showed good tensile properties and fracture toughness. The cold-worked material had much higher strength, but the fracture toughness was reduced. At 650-degrees-C both the cold-worked and the annealed conditions showed reduced toughness. The cast alloy showed acceptable tensile properties and fracture toughness at room temperature, and good tensile properties at 650-degrees-C. However, the fracture toughness was reduced at the higher temperature. Impact testing showed relatively little effect of temperature. Intergranular fracture for the wrought alloy, and interdendritic fracture for the cast material were found to be responsible for the low toughness observed at 650-degrees-C. The availability of oxygen to the freshly exposed metal at the strained crack tip is believed to cause oxygen embrittlement of the grain boundaries, and thus intergranular fracture for the wrought alloy, and interdendritic failure for the cast material. RP ALEXANDER, DJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 7 TC 10 Z9 11 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 114 EP 119 DI 10.1016/0921-5093(92)90055-6 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800019 ER PT J AU SCHNEIBEL, JH HORTON, JA PORTER, WD AF SCHNEIBEL, JH HORTON, JA PORTER, WD TI BEND-DUCTILITY, CREEP STRENGTH AND PHYSICAL-PROPERTIES OF EXTRUDED CHROMIUM-MODIFIED AL3TI SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET ID DEFORMATION; FRACTURE; ALLOY AB Chromium-modified Al3Ti (Al-8Cr-25Ti, at.%) with the cubic L1(2) structure was processed by extrusion, resulting in a fine-grained recrystallized microstructure. The material was essentially single phase, with only a low volume fraction of Al2O3 and titanium-enriched particles. Oxygen and carbon contents were also low. Room temperature bend tests with strain gages attached to the tension side of the specimens were performed. For sufficiently good surface finishes permanent tensile strains up to 0.16% were recorded, in qualitative agreement with Zhang's results (S. Zhang, J. P. Nic and D. E. Mikkola, Scr. Metall., 24 (1990) 57). However, for less perfect finishes, fracture occurred well below the compressive yield stress. In other words, Al-Cr-Ti is highly notch-sensitive and has a low toughness. As in other trialuminides, fracture occurred by cleavage. Compression creep tests at 1200 K, measurements of Young's modulus, the thermal expansion coefficient, the melting point and the specific heat capacity have been performed. RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 17 TC 25 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 126 EP 131 DI 10.1016/0921-5093(92)90057-8 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800021 ER PT J AU NISHIMURA, C LIU, CT AF NISHIMURA, C LIU, CT TI EFFECTS OF TEST ENVIRONMENT AND GRAIN-SIZE ON THE TENSILE PROPERTIES OF L12-ORDERED (CO,FE)3V ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET ID HYDROGEN EMBRITTLEMENT; MECHANICAL-PROPERTIES; CO3TI POLYCRYSTALS; ORDERED ALLOYS; NI3AL; FRACTURE; (FE,CO,NI)3V; DEFORMATION; DUCTILITY; BERYLLIUM AB The influence of test environment, grain size and heat treatment on the tensile properties and fracture behavior of L1(2)-ordered (Co78Fe22)3V and (Co85Fe15)3V alloys was studied at room temperature. The tensile ductility depends strongly test environments; the elongation decreases in the sequence of oxygen, vacuum, air and distilled water. The loss in elongation is accompanied by a change in fracture mode from transgranular to intergranular. When tested in oxygen or vacuum, (Co78Fe22)3V specimens exhibited predominantly transgranular fracture, while (Co85Fe15)V specimens exhibited essentially intergranular fracture. Grain refinement of (Co78Fe22)3V resulted in a ductility improvement in a ductility improvement in air, while such a beneficial effect of grain refinement was not observed in (Co85Fe15)3V. These results suggest that: (1) (Co,Fe)3V alloys exhibit a moisture-induced hydrogen embrittlement and (2) grain boundaries are more intrinsically brittle in (Co85Fe15)3V than in (Co78Fe22)3V. The presence of a brittle hexagonal phase is suggested to bc the reason for the observed grain-boundary brittleness in (Co85Fe15)3V. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 27 TC 6 Z9 6 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 146 EP 152 DI 10.1016/0921-5093(92)90060-E PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800024 ER PT J AU HORTON, JA WANG, ZL FRASER, HL BEANLAND, R AF HORTON, JA WANG, ZL FRASER, HL BEANLAND, R TI ON CHARGE-DENSITY DETERMINATIONS IN INTERMETALLICS BY QUANTITATIVE CONVERGENT BEAM ELECTRON-DIFFRACTION SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET AB Experimental measurements of the charge distribution in intermetallics would be both a useful confirmation of calculated charge density maps and a great aid in explaining the inherent brittleness of many intermetallics, especially the cubic trialuminides. Bonding charge densities were previously measured in GaAs by a convergent beam electron diffraction (CBED) technique in a transmission electron microscope operated at 100 kV. By electronically recording an energy filtered CBED pattern and comparing this measured rocking curve to a calculated one, an accurate electron scattering factor of the crystal can be determined. While the technique utilizes readily available equipment, a number of experimental difficulties remain. C1 OHIO STATE UNIV,DEPT MAT SCI,COLUMBUS,OH 43210. RP HORTON, JA (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011; Beanland, Richard/D-7696-2012 OI Wang, Zhong Lin/0000-0002-5530-0380; Beanland, Richard/0000-0003-1749-4134 NR 9 TC 1 Z9 1 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 237 EP 239 DI 10.1016/0921-5093(92)90072-9 PG 3 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800036 ER PT J AU GUHA, S BAKER, I MUNROE, PR MICHAEL, JR AF GUHA, S BAKER, I MUNROE, PR MICHAEL, JR TI THE EFFECT OF ANNEALING ON NI-AL-FE B2 COMPOUNDS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET ID TEMPERATURE TENSILE DUCTILITY AB Rods of both Ni-30Al-20Fe and Ni-40Al-30Fe were examined by optical microscopy and transmission electron microscopy in both the as-(double) extruded condition and after various heat treatments. Hardness, tensile and compression tests were performed on the alloys. The as-extruded and high temperature (750-degrees-C or higher) microstructures of Ni-30Al-20Fe were similar and consisted of B2 grains with a gamma-Fe phase covering some boundaries; at 500-degrees-C the microstructure consists of alpha-Fe precipitates in a B2 matrix but no grain boundary phase was present. The microstructure of Ni-40Al-30Fe consisted of alpha-Fe precipitates in a B2 matrix at all temperatures, the precipitates coarsened with increasing annealing temperature. For short (200 min) anneals of both alloys yield strength, hardness maxima and ductility minima were found after annealing at 500-degrees-C. These effects were ascribed to the alpha-Fe precipitates. The presence of the gamma-Fe phase on the grain boundaries of Ni-30Al-20Fe may have contributed to the ductility enhancement in the as-extruded condition after high (750-degrees-C or higher) anneals. C1 DARTMOUTH COLL,THAYER SCH ENGN,HANOVER,NH 03755. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RI Munroe, Paul/I-9313-2016 OI Munroe, Paul/0000-0002-5091-2513 NR 16 TC 23 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 258 EP 263 DI 10.1016/0921-5093(92)90076-D PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800040 ER PT J AU MAZIASZ, PJ MCKAMEY, CG AF MAZIASZ, PJ MCKAMEY, CG TI MICROSTRUCTURAL CHARACTERIZATION OF PRECIPITATES FORMED DURING HIGH-TEMPERATURE TESTING AND PROCESSING OF IRON ALUMINIDE ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET AB Iron-aluminide alloys were examined using analytical electron microscopy after creep-rupture testing at 600-650-degrees-C or after thermomechanical processing at 650-1250-degrees-C. Various precipitates were found in several different alloys after testing or heat treatments and most were identified as carbide phases. Small Mo2C grain boundary precipitates and occasional coarse Fe-Al-Mo Laves phase particles were found after creep testing at 650-degrees-C in a ternary Fe3Al+2Mo alloy, but only after 0.3 h at 275 MPa and not after 90 h at 69 MPa. Large and small niobium- and zirconium-rich MC phase particles were found in the matrix and grain boundaries of a ternary Fe3Al + 1Nb alloy (zirconium and carbon are unintentional impurities) creep tested for 1932 h at 650-degrees-C and 69 MPa, whereas no such precipitates were observed when creep-rupture occured after only 0.5 h at 275 MPa. Two different precipitate phases were found in a complex Fe3Al+Cr, Mo,Ti,Nb,V,C alloy after high temperature processing or mechanical testing, a titanium-rich MC phase and a Cr-Mo-Fe phase (Fe2MoC?). Coarse matrix particles of both phases were found after hot rolling at 650-degrees-C. The precipitates partially dissolved and only MC remained after solution annealing (SA) at 1100-1200-degrees-C, but finer grain boundary MC was found after a SA treatment at 1250-degrees-C. The Cr-Mo-Fe phase was not found after the SA treatments, but was found to form around matrix MC particles during creep at 600-degrees-C (207 MPa for 244 h) and during aging for 9 h at 750-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 16 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 322 EP 334 DI 10.1016/0921-5093(92)90086-G PG 13 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800050 ER PT J AU WHANG, SH POPE, DP LIU, CT AF WHANG, SH POPE, DP LIU, CT TI PROCEEDINGS OF THE 2ND INTERNATIONAL ASM CONFERENCE ON HIGH-TEMPERATURE ALUMINIDES AND INTERMETALLICS, SEPTEMBER 16-19, 1991, SAN-DIEGO, CA, USA .1. PREFACE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Editorial Material C1 UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP WHANG, SH (reprint author), POLYTECH INST NEW YORK,DEPT MET & MAT SCI,6 METROTECH CTR,BROOKLYN,NY 11201, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP R5 EP R5 DI 10.1016/0921-5093(92)90036-Z PG 1 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800001 ER PT J AU DASILVA, LB TREBES, JE MROWKA, S BARBEE, TW BRASE, J KOCH, JA LONDON, RA MACGOWAN, BJ MATTHEWS, DL MINYARD, D STONE, G YORKEY, T ANDERSON, E ATTWOOD, DT KERN, D AF DASILVA, LB TREBES, JE MROWKA, S BARBEE, TW BRASE, J KOCH, JA LONDON, RA MACGOWAN, BJ MATTHEWS, DL MINYARD, D STONE, G YORKEY, T ANDERSON, E ATTWOOD, DT KERN, D TI DEMONSTRATION OF X-RAY MICROSCOPY WITH AN X-RAY LASER OPERATING NEAR THE CARBON K EDGE SO OPTICS LETTERS LA English DT Article AB High-brightness and short-pulse-width (approximately 200 ps) x-ray lasers offer biologists the possibility of high-resolution three-dimensional imaging of specimens in an aqueous environment without the blurring effects associated with natural motions. As a first step toward developing the capabilities of this type of x-ray microscopy we have used a tantalum x-ray laser (lambda = 4.483 nm) together with an x-ray zone plate lens to image a test pattern. The observed image shows a detector-limited resolution of approximately 75 nm and paves the way to three-dimensional biological imaging with high spatial resolution (20-30 nm). C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR X-RAY OPT,BERKELEY,CA 94720. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP DASILVA, LB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 20 TC 43 Z9 43 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 MAY 15 PY 1992 VL 17 IS 10 BP 754 EP 756 DI 10.1364/OL.17.000754 PG 3 WC Optics SC Optics GA HT344 UT WOS:A1992HT34400019 PM 19794620 ER PT J AU MELIUS, CF AF MELIUS, CF TI THE THERMOCHEMISTRY AND REACTION PATHWAYS OF ENERGETIC MATERIAL DECOMPOSITION AND COMBUSTION SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID DETONATION AB The chemical processes involved in the decomposition and combustion of energetic materials have been investigated theoretically using quantum chemical methods to determine the thermochemistry and reaction pathways. The Bond-Additivity-Corrected Moller-Plesset fourth-order perturbation theory method (BAC-MP4) has been used to determine heats of formation and free energies of reaction intermediates of decomposition and combustion. ln addition, the BAC-MP4 method has been used to determine reaction pathways involving these intermediates. A theoretical method for calculating solvation energies has been developed to treat the non-idealities of high pressure and the condensed phase. The resulting chemical processes involving decomposition, ignition and combustion are presented for nitramines and nitromethane. Differences in decomposition mechanisms for the condensed phase and gas phase are discussed. ln addition, we discuss the effects that amines can have on the initial stages of condensed-phase nitromethane decomposition. Bond dissociation energies for nitro-triazoles are compared with those of other nitro compounds. RP MELIUS, CF (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 12 TC 10 Z9 11 U1 0 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8428 J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD MAY 15 PY 1992 VL 339 IS 1654 BP 365 EP 376 DI 10.1098/rsta.1992.0042 PG 12 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HV880 UT WOS:A1992HV88000010 ER PT J AU MANDELBAUM, P SEELY, JF FELDMAN, U BROWN, CM KANIA, DR GOLDSTEIN, WH KAUFFMAN, RL LANGER, S BARSHALOM, A AF MANDELBAUM, P SEELY, JF FELDMAN, U BROWN, CM KANIA, DR GOLDSTEIN, WH KAUFFMAN, RL LANGER, S BARSHALOM, A TI DENSITY DIAGNOSTIC OF A URANIUM LASER-PRODUCED PLASMA FROM THE LINE RATIO OF DELTA-N=1 TRANSITIONS IN NI-LIKE URANIUM SO PHYSICAL REVIEW A LA English DT Article ID X-RAY-SPECTRA; RANGE; TANTALUM; ATOMS; MODEL; IONS; TM; AU AB The intensity ratio of the electric quadrupole 3p(6)3d10-3p3/2(5)4f7/2(J = 2) line to the electric dipole 3p(6)3d10-3p1/2(5)4s line is used as a density diagnostic of a highly ionized uranium laser-produced plasma for electron densities of 10(19)-10(23) cm-3. Calculations show that this ratio is insensitive to the plasma temperature in the range of 1000-4000 eV. Self-absorption of the lines is shown to be unimportant in this density range. Experimental line ratios are compared to the predictions of a Ni-like uranium-ion model that includes 138 excited levels. The densities inferred from this analysis applied to a measured line ratio yield densities of (4.0 +/- 0.5) x 10(22) cm-3. This is in good agreement with models of x-ray production in laser-produced plasmas. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP MANDELBAUM, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 20 TC 4 Z9 4 U1 3 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1992 VL 45 IS 10 BP 7480 EP 7483 DI 10.1103/PhysRevA.45.7480 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700063 ER PT J AU MANDELBAUM, P SEELY, JF KANIA, DR KAUFFMAN, RL AF MANDELBAUM, P SEELY, JF KANIA, DR KAUFFMAN, RL TI 3D-4P X-RAY-SPECTRUM EMITTED BY HIGHLY IONIZED URANIUM FROM A LASER-PRODUCED PLASMA IN THE 3.8-LESS-THAN-LAMBDA-LESS-THAN-4.4-ANGSTROM WAVELENGTH RANGE SO PHYSICAL REVIEW A LA English DT Article ID TRANSITION ARRAYS; ATOMIC SPECTRA; ENERGY-LEVELS; DISTRIBUTIONS; VARIANCE AB This work extends a previous analysis of the x-ray spectrum of a laser-produced uranium plasma [P. Mandelbaum et al., Phys. Rev. A 44, 5752 (1991)] to the longer-wavelength range (3.8 < lambda < 4.4 angstrom) which includes the 3d-4p transitions. Detailed analysis of the spectrum has been performed using the HULLAC computer code and the unresolved-transition-array formalism. 3d-4p transitions emitted from ions belonging to the Co-like (U+65) through As-like (U+59) isoelectronic sequences are identified in the spectrum, in good agreement with the previous analysis of the spectrum emitted at shorter wavelengths. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP MANDELBAUM, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 1 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 MAY 15 PY 1992 VL 45 IS 10 BP 7484 EP 7487 DI 10.1103/PhysRevA.45.7484 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700064 ER PT J AU MARSH, GE AF MARSH, GE TI AXIALLY SYMMETRICAL SOLUTIONS TO THE FORCE-FREE MAGNETIC-FIELD EQUATIONS IN SPHERICAL AND CYLINDRICAL COORDINATES SO PHYSICAL REVIEW A LA English DT Article AB The force-free magnetic-field condition del x H = alpha-H is expressed in terms of a flux function-PSI; alpha is then also a function of PSI, and with suitable restrictions the resulting equations can be separated and solved. The case of spherical coordinates yields four sets of solutions that are shown to be dependent and equivalent to a simple generalization of those given by Chandrasekhar [Proc. Natl. Acad. Sci. U.S.A. 42, 1 (1956)]. Similarly, the case of cylindrical coordinates results in a generalization of the solution given by Furth, Levine, and Waniek [Rev. Sci. Instrum. 28, 949 (1957)]. RP MARSH, GE (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 18 TC 8 Z9 8 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 MAY 15 PY 1992 VL 45 IS 10 BP 7520 EP 7525 DI 10.1103/PhysRevA.45.7520 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700069 ER PT J AU FERER, M GEISBRECHT, RA SAMS, WN SMITH, DH AF FERER, M GEISBRECHT, RA SAMS, WN SMITH, DH TI CROSSOVER FROM FRACTAL TO COMPACT GROWTH FROM SIMULATIONS OF 2-PHASE FLOW WITH FINITE VISCOSITY RATIO IN 2-DIMENSIONAL POROUS-MEDIA SO PHYSICAL REVIEW A LA English DT Note ID DIFFUSION-LIMITED AGGREGATION; VISCOUS FINGERS AB We present simulations of Poiseuille flow in standard models of two-dimensional porous media for a variety of viscosity ratios. These simulations show definite crossover from initial diffusion-limited-aggregation-like fractal growth (m is-proportional-to R1.7) to compact growth (m is-proportional-to R2) on a length scale R(c), which increases as approximately the 1/3 power of the viscosity ratio. There appears to be an intermediate regime of denser-than-compact growth. C1 W VIRGINIA UNIV,DEPT PHYS,MORGANTOWN,WV 26506. RP FERER, M (reprint author), MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507, USA. NR 15 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1992 VL 45 IS 10 BP R6973 EP R6976 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700008 ER PT J AU NICOPOULOS, VN TRUGMAN, SA AF NICOPOULOS, VN TRUGMAN, SA TI COMPLEX QUANTUM DYNAMICS IN THE INTEGER QUANTUM HALL REGIME SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELD; SCATTERING; PERCOLATION; RESISTANCE; ELECTRON AB The scattering matrix for potential scattering of planar electrons in a perpendicular magnetic field is required to understand normal and Hall conductivity off of the quantum Hall plateaus, at nonzero temperature and frequency, and fluctuations and nonlinear transport. Little, however, was previously known about it. We have developed a method to calculate amplitudes and phases for impurity scattering in the quantum Hall regime, by classically evolving appropriate Wigner distribution functions and projecting them onto quantum states. To check the reliability of this approximate calculation, we have also developed a numerical method that solves exactly the quantum scattering problem for an infinitely long strip lattice. We consider mainly nonadiabatic scattering, in which the potential variation is rapid or moderate. Quantum scattering is shown to exhibit sharp resonances, even from repulsive potentials. The results of the two approaches are compared and the relation between quantum and complex classical scattering is made apparent. The existence of classical periodic orbits is demonstrated for general potentials, and the relation between classical periodic orbits and quantum resonances and phase shifts is analyzed. The possibility that breakdown in the quantum Hall effect is due to inter-Landau-level tunneling caused by rapidly varying impurity potentials is investigated. The prediction for the critical Hall field improves on previous explanations by about two orders of magnitude and is in reasonable agreement with experimental results. C1 UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. RP NICOPOULOS, VN (reprint author), LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87544, USA. NR 25 TC 5 Z9 5 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1992 VL 45 IS 19 BP 11004 EP 11015 DI 10.1103/PhysRevB.45.11004 PG 12 WC Physics, Condensed Matter SC Physics GA HU799 UT WOS:A1992HU79900018 ER PT J AU SPINDT, CJ YAMADA, M MEISSNER, PL MIYANO, KE KENDELEWICZ, T HERRERAGOMEZ, A SPICER, WE ARKO, AJ AF SPINDT, CJ YAMADA, M MEISSNER, PL MIYANO, KE KENDELEWICZ, T HERRERAGOMEZ, A SPICER, WE ARKO, AJ TI ELECTRONIC-STRUCTURE AND SCHOTTKY-BARRIER FORMATION ON GAAS(100) SURFACES PREPARED BY THERMAL-DESORPTION OF A PROTECTIVE ARSENIC COATING SO PHYSICAL REVIEW B LA English DT Article ID SCANNING TUNNELING MICROSCOPY; AU-GAAS(110) INTERFACE; METAL; TEMPERATURE; GAAS; RECONSTRUCTIONS; TRANSITION; MODEL AB Soft-x-ray photoemission spectroscopy has been used to characterize GaAs(100) surfaces and interfaces grown by molecular-beam epitaxy and prepared by the thermal desorption of a protective As coating. The samples studied were grown and arsenic capped identically to those used in a previous study [Brillson et al., J. Vac. Sci. Technol. B 6, 1263 (1988)]. In this previous work, "unpinned" Schottky-barrier formation was reported, with barrier heights over a wide (0.75-eV) range. This is a striking result, as it was previously believed that all metals will pin GaAs surfaces in a narrow energy range near the middle of the band gap. This large range of barrier heights later led to the suggestion that the (100) surface could become an insulating layer that could screen out the effects of metal-induced gap states. Motivated by this work, we have studied Al and Au Schottky barriers since the deposition of these two metals gave the extreme low and high barriers in the 0.75-eV range. We have also characterized the clean surfaces prepared by desorbing the As caps at different temperatures. The As 3d and Ga 3d core levels showed that the surface stoichiometry could be varied significantly with the desorption temperature. The As 3d line shape was found to be the best indication of the surface stoichiometry after the anneal. The valence-band spectra did not show any strong features which could be used to determine when the sample was completely decapped. The electronic structure of the surface layer was investigated experimentally, and no evidence of an insulating reconstruction was found. In our study of band bending, we found that the low-doped samples used here and in the earlier study showed significant photovoltages resulting in incorrect band-bending measurements. We also found that the Au measurements are made difficult by the presence of core-level shifts due to Au-Ga alloying. After solving the problems with the photovoltages and alloying, we found that the barriers heights for Au and Al differ by only 0.25 eV. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SPINDT, CJ (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. NR 29 TC 36 Z9 36 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1992 VL 45 IS 19 BP 11108 EP 11119 DI 10.1103/PhysRevB.45.11108 PG 12 WC Physics, Condensed Matter SC Physics GA HU799 UT WOS:A1992HU79900028 ER PT J AU OSORIO, R BERNARD, JE FROYEN, S ZUNGER, A AF OSORIO, R BERNARD, JE FROYEN, S ZUNGER, A TI ORDERING THERMODYNAMICS OF SURFACE AND SUBSURFACE LAYERS IN THE GA1-XINXP ALLOY SO PHYSICAL REVIEW B LA English DT Article ID VAPOR-PHASE EPITAXY; MOLECULAR-BEAM EPITAXY; EXCESS ELASTIC ENERGY; FCC CRYSTAL-STRUCTURE; LONG-RANGE ORDER; BAND-GAP ENERGY; SEMICONDUCTOR ALLOYS; BINARY-ALLOYS; 1ST-PRINCIPLES CALCULATION; 001 SUPERLATTICES AB Although bulk III-V alloys exhibit phase separation, vapor-phase epitaxial growth of Ga0.5In0.5P/GaAs (001) at almost-equal-to 900-1000 K. shows spontaneous ordering into the [111]-oriented monolayer (GaP)1 (InP)1 superlattice (the "CuPt" structure). Only two superlattice directions ([111BAR] and [111BAR], which define the CUPt(B) variant) out of four possible are seen. Both [111BAR] and [111BAR] subvariants are observed on flat surfaces or when surface steps are perpendicular to the cation dimers. Ordering was seen also in nonstoichiometric (e.g., Ga.0.7In0.3P) alloys. Previous total-energy calculations at T = 0 show that (i) phase separation is eliminated by the constraint that the alloy and its constituents are coherently matched to a substrate; (ii) the epitaxially stable chalcopyrite order is eliminated by surface reconstruction; (iii) surface reconstruction stabilizes the CuPt(B) variant over the other structures. A relaxed but unreconstructed surface does not lead to any significant preference for ordering. Here we develop thermodynamic (T not-equal 0) calculations based on cluster-variation solutions to a configurational Hamiltonian whose interaction energies are fit to T = 0 total-energy calculations. This shows that (iv) significant CuPt(B) ordering persists to approximately 1500 K not only for the equimolar Ga0.5In0.5P alloy, but also at other compositions, e.g., Ga0.7In0.3P; (v) the cation-terminated surface couples to the fourth layer in such a way as to select the correct three-dimensional CuPt(B) structure; (vi) once formed, the two-dimensional CuPt(B) layers near the surface are remarkably stable towards atomic swaps; (vii) a flat surface leads to a sufficiently small coupling between cation layers so that either of the two CuPt(B) variants can form. We conclude that the main features of the observed ordering can be explained as a thermodynamically stable phase at growth temperatures of either the surface or the first few subsurface layers, depending on how deeply into the alloy atomic mobilities remain sufficiently large. C1 UNIV BRASILIA,DEPT FIS,BR-70910 BRASILIA,DF,BRAZIL. RP OSORIO, R (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 85 TC 52 Z9 52 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 MAY 15 PY 1992 VL 45 IS 19 BP 11173 EP 11191 DI 10.1103/PhysRevB.45.11173 PG 19 WC Physics, Condensed Matter SC Physics GA HU799 UT WOS:A1992HU79900037 ER PT J AU YOU, H MELENDRES, CA NAGY, Z MARONI, VA YUN, W YONCO, RM AF YOU, H MELENDRES, CA NAGY, Z MARONI, VA YUN, W YONCO, RM TI X-RAY-REFLECTIVITY STUDY OF THE COPPER-WATER INTERFACE IN A TRANSMISSION GEOMETRY UNDER INSITU ELECTROCHEMICAL CONTROL SO PHYSICAL REVIEW B LA English DT Article ID SCATTERING; FILMS; SURFACES; SILICON AB Using an electrochemical cell that permits x-ray-scattering studies in a transmission geometry under in situ electrochemical control, we performed an x-ray specular-reflectivity study of the copper-water interface as a function of electrochemical potential. It is found that the reflectivity changes upon cyclic oxidation and reduction, indicating a phase transition between copper and copper oxide at the interface. We also find that the thickness of the pure copper and the roughness of the interfaces exhibit electrochemical irreversibility that is consistent with the potentials for the oxidation waves in the anodic cycle and the reduction waves in the cathodic cycle. A standard Fresnel expression for the x-ray specular reflectivity was applied in the data analysis. A smoothly varying Lorentzian interface profile was used for the individual rough interfaces. An incoherent average was additionally used to include the effect of correlated roughness between a pair of interfaces. The results of our data-fitting procedure are discussed in relation to the electrochemical information obtained in the corresponding cyclic I-V curves. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV ADV PHOTON SOURCE,ARGONNE,IL 60439. RP YOU, H (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 18 TC 39 Z9 39 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1992 VL 45 IS 19 BP 11288 EP 11298 DI 10.1103/PhysRevB.45.11288 PG 11 WC Physics, Condensed Matter SC Physics GA HU799 UT WOS:A1992HU79900050 ER PT J AU LAKS, DB ZUNGER, A AF LAKS, DB ZUNGER, A TI IDENTITY OF THE CONDUCTION-BAND MINIMUM IN [ALAS](1)/[GAAS](1) (001) SUPERLATTICES - INTERMIXING-INDUCED REVERSAL OF STATES SO PHYSICAL REVIEW B LA English DT Note ID GAAS-ALAS SUPERLATTICES; ELECTRONIC-STRUCTURE; SELF-CONSISTENT; ENERGY; CHARACTER; ALLOYS; GAPS AB First-principles pseudopotential calculations on the (001) (AlAs)1/(GaAs)1 superlattice (SL) shows that partial intermixing of the A and Ga atoms relative to the abrupt case lowers its formation energy, making this SL even stabler at low T than the fully randomized Al0.5Ga0.5sAs alloy. Concomitantly, the conduction-band minimum (CBM) reverts from the GaAs L-derived state, to the X(xy)-derived AlAs state. The Previously noted discrepancy between theory (pertinent to abrupt SL's and yielding an L-derived CBM) and experiment (yielding an X(xy)-derived CBM) is therefore attributed to insufficient interfacial abruptness in the samples used to date in experimental studies. RP LAKS, DB (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 26 TC 10 Z9 10 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 MAY 15 PY 1992 VL 45 IS 19 BP 11411 EP 11414 DI 10.1103/PhysRevB.45.11411 PG 4 WC Physics, Condensed Matter SC Physics GA HU799 UT WOS:A1992HU79900080 ER PT J AU WALTER, U THOMSON, RE BURK, B CROMMIE, MF ZETTL, A CLARKE, J AF WALTER, U THOMSON, RE BURK, B CROMMIE, MF ZETTL, A CLARKE, J TI SCANNING TUNNELING MICROSCOPY OF THE BLUE BRONZES (RB,K)0.3MOO3 SO PHYSICAL REVIEW B LA English DT Article ID WAVE PHASE-TRANSITION; CHARGE-DENSITY WAVES; NIOBIUM TRISELENIDE; X-RAY; K0.3MOO3; K0.30MOO3; CONDUCTOR; SURFACE; NEUTRON; STATE AB We have performed scanning tunneling microscopy of the blue bronzes K0.30MoO3 and Rb0.30MoO3 both above and below the charge-density-wave (CDW) transition temperature, T(P) = 180 K. We were able to image the Mo-O octahedra on the crystal surface at 295, 143, and 77 K. Below T(P), we were not able to image any additional superstructure due to the CDW, suggesting a relatively small CDW amplitude at the sample surface. Furthermore, the lattice images that we obtained below T(P) are unaffected by the sliding of the CDW. C1 UNIV CALIF BERKELEY,DEPT PHYS,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 22 TC 16 Z9 16 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1992 VL 45 IS 20 BP 11474 EP 11480 DI 10.1103/PhysRevB.45.11474 PG 7 WC Physics, Condensed Matter SC Physics GA HV747 UT WOS:A1992HV74700003 ER PT J AU DASILVA, AJR FALICOV, LM AF DASILVA, AJR FALICOV, LM TI CALCULATION OF OPTICAL-TRANSITIONS IN NII2 AND COI2 UNDER PRESSURE SO PHYSICAL REVIEW B LA English DT Article ID INTERSECTING-SPHERES MODEL; NICL2 AB A calculation of the electronic spectra of Co2+ in insulating CoI2 and Ni2+ in insulating NiI2 as a function of pressure is presented. The results depend crucially on the variation with pressure of the crystallographic (c/a) and u parameters. Level crossings are expected as a function of increasing pressure, including a possible change in the symmetry of the ground state for NiI2. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP DASILVA, AJR (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 24 TC 2 Z9 2 U1 3 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 MAY 15 PY 1992 VL 45 IS 20 BP 11511 EP 11517 DI 10.1103/PhysRevB.45.11511 PG 7 WC Physics, Condensed Matter SC Physics GA HV747 UT WOS:A1992HV74700007 ER PT J AU BUTLER, WH GONIS, A ZHANG, XG AF BUTLER, WH GONIS, A ZHANG, XG TI MULTIPLE-SCATTERING THEORY FOR SPACE-FILLING CELL POTENTIALS SO PHYSICAL REVIEW B LA English DT Article ID NON-MUFFIN-TIN; ENERGY-BAND EQUATION; KORRINGA; ROSTOKER; KOHN; SYSTEMS; SHAPE AB The multiple-scattering theory (MST) method of Korringa, and of Kohn and Rostoker for determining the electronic structure of solids, originally developed in connection with potentials bounded by nonoverlapping spheres (muffin-tin potentials), is generalized to the case of space-filling potential cells of arbitrary shape. Both variational and nonvariational formalisms are used in effecting this generalization. In contrast to the case of muffin-tin potentials, different forms of MST exhibit different convergence rates for the energy and the wave function. Numerical results are presented that illustrate the differing convergence rates of the variational and nonvariational forms of MST for space-filling potentials. The generalized MST described here should be useful quite generally for constructing global solutions to linear partial differential equations from sets of locally exact solutions. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. UNIV KENTUCKY,CTR COMPUTAT SCI,LEXINGTON,KY 40506. RP BUTLER, WH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 46 TC 52 Z9 53 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 MAY 15 PY 1992 VL 45 IS 20 BP 11527 EP 11541 DI 10.1103/PhysRevB.45.11527 PG 15 WC Physics, Condensed Matter SC Physics GA HV747 UT WOS:A1992HV74700009 ER PT J AU WANG, HY NAJAFABADI, R SROLOVITZ, DJ LESAR, R AF WANG, HY NAJAFABADI, R SROLOVITZ, DJ LESAR, R TI (100) SURFACE SEGREGATION IN CU-NI ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID AUGER-ELECTRON SPECTROSCOPY; COPPER-NICKEL-ALLOYS; EMBEDDED-ATOM-METHOD; FINITE TEMPERATURE STRUCTURE; CRYSTAL-FACE SPECIFICITY; ENERGY ION-SCATTERING; 001 TWIST BOUNDARY; FCC METALS CU; DEPTH PROFILE; CUXNI1-X ALLOY AB Atomistic simulations of segregation to the (100) free surface in Ni-Cu alloys have been performed for a wide range of temperatures and compositions within the solid-solution region of the alloy phase diagram. In addition to the surface-segregation profile, surface structures, free energies, enthalpies, and entropies were determined. These simulations were performed within the framework of the free-energy simulation method, in which an approximate free-energy functional is minimized with respect to atomic coordinates and atomic-site occupation. For all alloy bulk compositions (0. 05 less-than-or-equal-to C less-than-or-equal-to 0.95) and temperatures (400 less-than-or-equal-to T less-than-or-equal-to 1000 K) examined, Cu segregates strongly to the surface and Ni segregates to the planes just below the surface. The width of the segregation profile is limited to approximately three atomic planes. The resultant segregation profiles are shown to be in good agreement with an empirical segregation theory. A simpler method for determining the equilibrium segregation in terms of the properties of unrelaxed pure Ni and pure Cu surface data is proposed and shown to be more accurate than the existing empirical segregation analyses. The surface thermodynamic properties depend sensitively on the magnitude of the surface segregation. The enthalpy, entropy of segregation, and the change in the interlayer spacing adjacent to the surface are shown to vary linearly with the magnitude of the surface segregation. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP WANG, HY (reprint author), UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109, USA. RI LeSar, Richard/G-1609-2012 NR 48 TC 36 Z9 36 U1 1 U2 14 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 MAY 15 PY 1992 VL 45 IS 20 BP 12028 EP 12042 DI 10.1103/PhysRevB.45.12028 PG 15 WC Physics, Condensed Matter SC Physics GA HV747 UT WOS:A1992HV74700065 ER PT J AU YEH, CY LU, ZW FROYEN, S ZUNGER, A AF YEH, CY LU, ZW FROYEN, S ZUNGER, A TI PREDICTIONS AND SYSTEMATIZATIONS OF THE ZINCBLENDE WURTZITE STRUCTURAL ENERGIES IN BINARY OCTET COMPOUNDS SO PHYSICAL REVIEW B LA English DT Note ID INTERMETALLIC COMPOUNDS; STABILITY DIAGRAM AB To systematize the wurtzite (W) versus zinc blende (ZB) structural preferences among the binary octet compounds, we have calculated the corresponding energy difference DELTA-E(W-ZB)LDF(AB) for thirteen AB compounds using the local-density formalism (LDF). We then uncovered a linear scaling between DELTA-E(W-ZB)LDF and an atomistic orbital-radii coordinate R(A,B) that can be simply calculated from the properties of the free A and B atoms. This permits perdictions of W-ZB energy differences for all binary compounds and exposes simple chemical trends, including the stabilization of the ZB form in the sequence B = O --> S --> Se --> Te for A(II)B(VI) and A = Ga --> Al --> In for A(III)B(V)'s. We propose new structural assignments for the low-temperature ground state of CdSe (ZB) and MgTe (NiAs type). RP YEH, CY (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 33 TC 79 Z9 79 U1 0 U2 8 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 MAY 15 PY 1992 VL 45 IS 20 BP 12130 EP 12133 DI 10.1103/PhysRevB.45.12130 PG 4 WC Physics, Condensed Matter SC Physics GA HV747 UT WOS:A1992HV74700085 ER PT J AU ERLER, J JUNGNICKEL, D LAUER, J AF ERLER, J JUNGNICKEL, D LAUER, J TI DEPENDENCE OF YUKAWA COUPLINGS ON THE AXIONIC BACKGROUND MODULI OF Z(N) ORBIFOLDS SO PHYSICAL REVIEW D LA English DT Article ID HETEROTIC STRING THEORY; FIELD-THEORIES; COMPACTIFICATIONS; SYMMETRY AB The metrical and axionic background moduli which determine a general symmetric Z(N) orbifold model are chosen in such a way that the rotational twist leaves the underlying sigma-model action invariant. A thorough analysis of this condition is given. We notice that it plays a key role in the evaluation of the four-point correlation functions of ground states which belong to the lowest twisted sectors. Having fixed the normalization of these functions we factorize them with respect to the twisted intermediate channel. This method yields the moduli-dependent part of the twisted sector Yukawa couplings of an orbifoldized heterotic string model. We then perform various discrete mappings (axionic shifts, duality) on the space of background moduli and recognize that the induced linear transformations of the Yukawa couplings are essentially independent of the choice of a specific background. If compensating unitary redefinitions of the twist fields are applied then orbifold models whose backgrounds are related by one of the above mappings cannot be distinguished. For many twist orders we arrive at an explicit form of the phase factors needed to redefine twist fields in order that a general discrete axionic shift can be undone. The requirement of duality invariance is sufficient to determine the moduli dependence of the Yukawa couplings. Hence one may even bypass the evaluation of instanton actions. C1 MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST,W-8000 MUNICH,GERMANY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP ERLER, J (reprint author), TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. NR 35 TC 15 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1992 VL 45 IS 10 BP 3651 EP 3668 DI 10.1103/PhysRevD.45.3651 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HU659 UT WOS:A1992HU65900042 ER PT J AU TRUGENBERGER, CA AF TRUGENBERGER, CA TI THE ANYON FLUID IN THE BOGOLIUBOV APPROXIMATION SO PHYSICAL REVIEW D LA English DT Article ID INCOMPRESSIBLE QUANTUM FLUID; FRACTIONAL-STATISTICS; HALL STATES; PARTICLES; SPIN; SUPERCONDUCTIVITY; REPRESENTATIONS; SUPERFLUIDITY; HIERARCHY; GAS AB We study the free anyon fluid by extending the usual Bogoliubov approximation to the case of nonlocal "statistical" interactions. We thereby compute the ground-state energy, the spectrum of low-lying excitations, the static structure factor, and the pair distribution function. The ground-state energy depends crucially on the magnetic dimension of the anyons, a scale that is unavoidably present at the quantum level. The linearly dispersing collective mode in the excitation spectrum indicates superfluidity. RP TRUGENBERGER, CA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET T8,LOS ALAMOS,NM 87545, USA. NR 41 TC 10 Z9 10 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 MAY 15 PY 1992 VL 45 IS 10 BP 3807 EP 3817 DI 10.1103/PhysRevD.45.3807 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HU659 UT WOS:A1992HU65900055 ER PT J AU AOKI, S GOCKSCH, A AF AOKI, S GOCKSCH, A TI SPONTANEOUS BREAKING OF FLAVOR SYMMETRY AND PARITY IN LATTICE QCD WITH WILSON FERMIONS SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM CHROMODYNAMICS AB By adding a symmetry-breaking source term of the form Hi-psiBAR-gamma-5-tau-3-psi the Wilson fermion action for two degenerate flavors of quarks, we provide evidence for the existence of a phase at large values of the hopping parameter K in which both parity and flavor symmetries are spontaneously broken and which is separate from the "high-temperature" phase. This is done by means of numerical simulations of lattice QCD employing the hybrid Monte Carlo algorithm. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP AOKI, S (reprint author), UNIV TSUKUBA,INST PHYS,TSUKUBA,IBARAKI 305,JAPAN. NR 19 TC 48 Z9 48 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1992 VL 45 IS 10 BP 3845 EP 3853 DI 10.1103/PhysRevD.45.3845 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HU659 UT WOS:A1992HU65900059 ER PT J AU TAN, GO ENSIGN, SA CIURLI, S SCOTT, MJ HEDMAN, B HOLM, RH LUDDEN, PW KORSUN, ZR STEPHENS, PJ HODGSON, KO AF TAN, GO ENSIGN, SA CIURLI, S SCOTT, MJ HEDMAN, B HOLM, RH LUDDEN, PW KORSUN, ZR STEPHENS, PJ HODGSON, KO TI ON THE STRUCTURE OF THE NICKEL IRON SULFUR CENTER OF THE CARBON-MONOXIDE DEHYDROGENASE FROM RHODOSPIRILLUM-RUBRUM - AN X-RAY ABSORPTION-SPECTROSCOPY STUDY SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE NI CARBON MONOXIDE DEHYDROGENASE; RHODOSPIRILLUM-RUBRUN; EDGE AND EXTENDED X-RAY ABSORPTION FINE STRUCTURE SPECTROSCOPY; NI ACTIVE SITE ID GROWN METHANOSARCINA-THERMOPHILA; CLOSTRIDIUM-THERMOACETICUM; ENZYME COMPLEX; PURIFICATION; ACTIVATION; PROTEIN; BARKERI; CRYSTAL; EXAFS; CO AB The nickel/iron/sulfur center of the carbon monoxide dehydrogenase (carbon monoxide:(acceptor)oxidoreductase; EC 1.2.99.2) enzyme from Rhodospirillum rubrum (Rr-CODH) was studied by x-ray absorption spectroscopy at the Ni K edge. Extended x-ray absorption fine structure data show that the first Ni coordination shell consists of 2 S atoms at 2.23 angstrom and 2-3 N/O atoms at 1.87 angstrom. The edge structure indicates a distorted tetrahedral or five-coordinate Ni environment in both oxidized and reduced Rr-CODH. By comparing second-shell extended x-ray absorption fine structure data of Rr-CODH to that of (Et4N)3[NiFe3S4(SEt)4], a cubane-type cluster, it was clearly established that Ni in the Rr-CODH center is not involved in the core of a NiFe3S4 cubane duster. One model consistent with the results is a mononuclear Ni2+ site, bridged by S-Cys or sulfide to one or both of the Fe4S4 clusters of the enzyme, with the remaining coordination sites occupied by additional S-Cys or N/O-liganding amino acid residues. C1 STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. UNIV WISCONSIN PARKSIDE,DEPT CHEM,KENOSHA,WI 53141. UNIV WISCONSIN,DEPT BIOCHEM,MADISON,WI 53706. HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138. UNIV SO CALIF,DEPT CHEM,LOS ANGELES,CA 90089. RI Scott, Michael/B-7859-2013; Ciurli, Stefano/K-4355-2014 OI Ciurli, Stefano/0000-0001-9557-926X FU NCRR NIH HHS [RR-01209]; NIGMS NIH HHS [GM 28856, GM 41822] NR 38 TC 57 Z9 58 U1 2 U2 7 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 MAY 15 PY 1992 VL 89 IS 10 BP 4427 EP 4431 DI 10.1073/pnas.89.10.4427 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HU977 UT WOS:A1992HU97700043 PM 1584775 ER PT J AU SPIELMANN, HP SASTRY, SS HEARST, JE AF SPIELMANN, HP SASTRY, SS HEARST, JE TI METHODS FOR THE LARGE-SCALE SYNTHESIS OF PSORALEN FURAN-SIDE MONOADDUCTS AND DIADDUCTS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID DNA CROSS-LINK; WAVELENGTH DEPENDENCE; ABC EXCINUCLEASE; ACTION MECHANISM; PHOTOCHEMISTRY; SITE; 8-METHOXYPSORALEN; DECONTAMINATION; REVERSAL AB We report methods for the preparation of multimicromole quantities of extremely pure uniquely photo-adducted psoralen-DNA furan-side monoadducts and diadducts (cross-links). The methods use high-intensity krypton and argon ion lasers in the photoreactions and HPLC methods to purify the required oligonucleotides containing the photo-adducts. With these methods we have synthesized 2-3-mu-mol of 8-mer psoralen furan-side monoadduct and diadduct. These methods allow one to generate large amounts of psoralenated DNA oligonucleotides and facilitate their study by NMR and x-ray crystallography. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. FU NCEH CDC HHS [NIEHS 07075-11]; NIGMS NIH HHS [GM 41911] NR 34 TC 21 Z9 21 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 MAY 15 PY 1992 VL 89 IS 10 BP 4514 EP 4518 DI 10.1073/pnas.89.10.4514 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HU977 UT WOS:A1992HU97700061 PM 1584785 ER PT J AU RINGQUIST, S SMITH, CL AF RINGQUIST, S SMITH, CL TI THE ESCHERICHIA-COLI CHROMOSOME CONTAINS SPECIFIC, UNMETHYLATED DAM AND DCM SITES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE DAM METHYLATION; DCM METHYLATION; PULSED-FIELD GEL ELECTROPHORESIS ID DNA METHYLATION; ADENINE METHYLATION; MISMATCH CORRECTION; K-12; ENDONUCLEASES; CLONING; STATES; GATC; OXYR; MAP AB The Escherichia coli chromosome encodes two methylases, dam and dcm, which recognize the sequences GATC and CC(A/T)GG, respectively. Specific dam and dcm sites on the E. coli chromosome were found to be unmethylated in vivo by using pulsed-field gel electrophoresis experiments scanning megabase regions of DNA. Some sites were totally unmethylated. The dam sites display variable methylation depending on the local sequence, and, in general, their methylation shows complex modulation by growth conditions and growth rate, suggesting multiple protection mechanisms. Sites resistant to complete dam or dcm methylation appear to be distributed throughout the chromosome. These unusual sites may identify regions of the chromosome with interesting biological functions. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 NR 41 TC 43 Z9 43 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 MAY 15 PY 1992 VL 89 IS 10 BP 4539 EP 4543 DI 10.1073/pnas.89.10.4539 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HU977 UT WOS:A1992HU97700066 PM 1584789 ER PT J AU REYMOND, P SHORT, TW BRIGGS, WR POFF, KL AF REYMOND, P SHORT, TW BRIGGS, WR POFF, KL TI LIGHT-INDUCED PHOSPHORYLATION OF A MEMBRANE-PROTEIN PLAYS AN EARLY ROLE IN SIGNAL TRANSDUCTION FOR PHOTOTROPISM IN ARABIDOPSIS-THALIANA SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE BLUE LIGHT; FLUENCE-RESPONSE RELATIONSHIPS; PHOTOTROPIC MUTANTS ID MUTANTS AB Blue light is known to cause rapid phosphorylation of a membrane protein in etiolated seedlings of several plant species, a protein that, at least in etiolated pea seedlings and maize coleoptiles, has been shown to be associated with the plasma membrane. The light-driven phosphorylation has been proposed on the basis of correlative evidence to be an early step in the signal transduction chain for phototropism. In the Arabidopsis thaliana mutant JK224, the sensitivity to blue light for induction of first positive phototropism is known to be 20- to 30-fold lower than in wild type, whereas second positive curvature appears to be normal. While light-induced phosphorylation can be demonstrated in crude membrane preparations from shoots of the mutant, the level of phosphorylation is dramatically lower than in wild type, as is the sensitivity to blue light. Another A. thaliana mutant, JK218, that completely lacks any phototropic responses to up to 2 h of irradiation, shows a normal level of light-induced phosphorylation at saturation. Since its gravitropic sensitivity is normal, it is presumably blocked in some step between photoreception and the confluence of the signal transduction pathways for phototropism and gravitropism. We conclude from mutant JK224 that light-induced phosphorylation plays an early role in the signal transduction chain for phototropism in higher plants. C1 CARNEGIE INST WASHINGTON, DEPT PLANT BIOL, 290 PANAMA ST, STANFORD, CA 94305 USA. USDA, CTR PLANT GENE EXPRESS, ALBANY, CA 94710 USA. MICHIGAN STATE UNIV, US DOE, PLANT RES LAB, E LANSING, MI 48824 USA. OI Reymond, Philippe/0000-0002-3341-6200 FU NIDCD NIH HHS [DCB-88 19137]; NIDCR NIH HHS [DE-FG02-90ER-20021] NR 12 TC 92 Z9 101 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD MAY 15 PY 1992 VL 89 IS 10 BP 4718 EP 4721 DI 10.1073/pnas.89.10.4718 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HU977 UT WOS:A1992HU97700102 PM 11537679 ER PT J AU MCNULTY, I KIRZ, J JACOBSEN, C ANDERSON, EH HOWELLS, MR KERN, DP AF MCNULTY, I KIRZ, J JACOBSEN, C ANDERSON, EH HOWELLS, MR KERN, DP TI HIGH-RESOLUTION IMAGING BY FOURIER-TRANSFORM X-RAY HOLOGRAPHY SO SCIENCE LA English DT Article ID MICROSCOPY AB Fourier transform x-ray holography has been used to image gold test objects with submicrometer structure, resolving features as small as 60 nanometers. The hologram-recording instrument uses coherent 3.4-nanometer radiation from the soft x-ray undulator beamline X1A at the National Synchrotron Light Source. The specimen to be imaged is placed near the first-order focal spot produced by a Fresnel zone plate; the other orders, chiefly the zeroth, illuminate the specimen. The wave scattered by the specimen interferes with the spherical reference wave from the focal spot, forming a hologram with fringes of low spatial frequency. The hologram is recorded in digital form by a charge-coupled device camera, and the specimen image is obtained by numerical reconstruction. C1 SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RI Jacobsen, Chris/E-2827-2015 OI Jacobsen, Chris/0000-0001-8562-0353 NR 29 TC 183 Z9 187 U1 6 U2 41 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 15 PY 1992 VL 256 IS 5059 BP 1009 EP 1012 DI 10.1126/science.256.5059.1009 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HU224 UT WOS:A1992HU22400035 PM 17795006 ER PT J AU HONG, SI LAIRD, C MARGOLIN, H WANG, ZR AF HONG, SI LAIRD, C MARGOLIN, H WANG, ZR TI SURFACE EFFECTS IN FATIGUE OF PLANAR SLIP ALLOYS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID COPPER SINGLE-CRYSTALS; CYCLIC DEFORMATION-BEHAVIOR; STRESS-STRAIN RESPONSE; CRACK INITIATION; CU-16; AMPLITUDE C1 UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. POLYTECH INST NEW YORK,DEPT MET & MAT SCI,BROOKLYN,NY 11201. UNIV TORONTO,DEPT MET & MAT SCI,TORONTO M5S 1A4,ONTARIO,CANADA. RP HONG, SI (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MS K762,LOS ALAMOS,NM 87544, USA. NR 34 TC 6 Z9 6 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD MAY 15 PY 1992 VL 26 IS 10 BP 1517 EP 1522 DI 10.1016/0956-716X(92)90249-E PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HQ890 UT WOS:A1992HQ89000004 ER PT J AU SRINIVASAN, S RUSS, JC SCATTERGOOD, RO AF SRINIVASAN, S RUSS, JC SCATTERGOOD, RO TI COMMENTS ON GRAIN-SIZE MEASUREMENTS USING THE POINT-SAMPLED INTERCEPT TECHNIQUE - REPLY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Letter C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP SRINIVASAN, S (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695, USA. RI Scattergood, Ronald/D-5204-2009 NR 0 TC 0 Z9 0 U1 0 U2 2 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 MAY 15 PY 1992 VL 26 IS 10 BP 1661 EP 1662 DI 10.1016/0956-716X(92)90274-I PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HQ890 UT WOS:A1992HQ89000029 ER PT J AU HANNON, JB PLUMMER, EW WENTZCOVITCH, RM LAM, PK AF HANNON, JB PLUMMER, EW WENTZCOVITCH, RM LAM, PK TI THE (1X3) MISSING-ROW SURFACE-STRUCTURE OF BE(11(2)BAR-0) SO SURFACE SCIENCE LA English DT Article ID LATTICE-RELAXATION; IR(110) SURFACE; METAL-SURFACES; RECONSTRUCTION; SCATTERING; BERYLLIUM AB We report an observation of a clean-surface reconstruction of a simple metal, a (1 x 3) structure on Be(1120BAR). Kinematic analysis of low-energy electron diffraction indicates that the (1 x 3) reconstruction involves the displacement of atomic chains at the surface. The stabilities of the unrelaxed, bulk-terminated surface and two proposed models based on missing rows were calculated using a first-principles pseudopotential method within the local-density approximation. Our results indicate that surface relaxation must be the determining factor in the stability of the reconstruction. Since Be has no occupied d-bands, the mechanism driving the reconstruction must be different from that of transition- and noble-metal missing-row reconstructions. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV HAWAII MANOA, DEPT PHYS & ASTRON, HONOLULU, HI 96822 USA. RP HANNON, JB (reprint author), UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. RI Wentzcovitch, Renata/J-8768-2015 NR 27 TC 8 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 15 PY 1992 VL 269 BP 7 EP 13 DI 10.1016/0039-6028(92)91220-6 PN A PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HW924 UT WOS:A1992HW92400003 ER PT J AU KANG, HC EVANS, JW AF KANG, HC EVANS, JW TI SCALING ANALYSIS OF SURFACE-ROUGHNESS IN SIMPLE-MODELS FOR MOLECULAR-BEAM EPITAXY SO SURFACE SCIENCE LA English DT Article ID THIN-FILM GROWTH; DIFFUSION AB There is currently interest in simple models for molecular-beam epitaxy (MBE) which mimic the effect of thermal mobility by allowing immediate incorporation of deposited atoms at kink sites within a distance l of the deposition site. Scaling of the interface width, W, with mean film height, [h], of the form W approximately [h]beta, is analysed. Studies for a solid-on-solid geometry in d = 1 + 1 dimensions revealed a sudden transition from the T = 0 K (l = 0) behavior of beta = 1/2 to a new universality class for l greater-than-or-equal-to 1 with beta = 3/8. We consider the effect of incorporating realistic adsorption-site geometries and deposition dynamics into these d = 1 + 1 MBE models. We find that beta is always less than 3/8 at T = 0 K (l = 0) due to lateral coupling, and that the effective beta increases smoothly with smaller l at least to 3/8. However, for larger l, the simple scaling of W described above breaks down in the physically relevant range of [h]. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT INTERNAL MED, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. RI Kang, Hway Chuan/A-3401-2012 NR 19 TC 15 Z9 15 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 MAY 15 PY 1992 VL 269 BP 784 EP 789 DI 10.1016/0039-6028(92)91349-G PN B PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HY643 UT WOS:A1992HY64300031 ER PT J AU WANG, BQ GENG, GQ LEVY, AV AF WANG, BQ GENG, GQ LEVY, AV TI EROSION CORROSION OF 1018 STEEL ERODED AT LOW VELOCITIES BY CFBC BED MATERIAL SO WEAR LA English DT Article AB The erosion-corrosion (E-C) behavior of 1018 carbon steel eroded by fluidized bed combustor (FBC) bed material particles at low elevated temperatures and low particle velocities was determined in a nozzle-type laboratory tester. Bed material erodent particles from operating, circulating fluidized bed combustors were used for tests in air at different temperatures from 25 to 550-degrees-C for exposure periods up to 100 h at particle velocities as low as 2.5 m s-1. The lowest velocity test conditions were meant to simulate those experienced by in-bed FBC heat exchanger tubes. Metal wastage rates were determined from thickness loss measurements of the specimens. It was determined that particle velocity influenced the relationship between metal wastage and test temperature. At the lowest particle velocity, 2.5 m s-1, a peak in the metal wastage-temperature curve occurred at 350-degrees-C. However, at a particle velocity of 10 m s-1, increasing the test temperature caused a continual increase in metal wastage at an ever-increasing slope. The particle velocity-temperature effect and the mechanisms of erosion-corrosion that occurred in the low particle velocity tests are explained in terms of the surface morphologies that occurred. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WANG, BQ (reprint author), XIAN INST HIGHWAY,XIAN,PEOPLES R CHINA. NR 9 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD MAY 15 PY 1992 VL 155 IS 1 BP 137 EP 147 DI 10.1016/0043-1648(92)90114-N PG 11 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA HW125 UT WOS:A1992HW12500012 ER PT J AU GENG, GQ WANG, BQ LEVY, AV AF GENG, GQ WANG, BQ LEVY, AV TI EFFECT OF CALCIUM-SULFATE PARTICLES ON CORROSION AND EROSION CORROSION OF CARBON-STEEL SO WEAR LA English DT Article AB In laboratory erosion-corrosion and corrosion experiments it was determined that calcium sulfate which occurs in fluidized bed combustion materials from the reaction of calcined limestone with the sulfur in the coal fuel can either protect the base metal against erosion-corrosion by aiding the formation of mixed calcium-compound-iron-oxide layers on the surface or promote its sulfidation, depending on the calcium sulfate content of the erodent particles and the test temperature, particle velocity, and duration. The reaction between calcium sulfate particles and metal substrates produced iron sulfide under certain test conditions. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP GENG, GQ (reprint author), XIAN INST HIGHWAY,SHAANXI,PEOPLES R CHINA. NR 18 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD MAY 15 PY 1992 VL 155 IS 1 BP 149 EP 161 DI 10.1016/0043-1648(92)90115-O PG 13 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA HW125 UT WOS:A1992HW12500013 ER PT J AU ANDREWS, MA GOULD, GL AF ANDREWS, MA GOULD, GL TI TRANSACETALATION - A CONVENIENT, NONAQUEOUS METHOD FOR EFFECTING THE DEPROTECTION OF ISOPROPYLIDENE AND BENZYLIDENE DERIVATIVES OF SUGARS SO CARBOHYDRATE RESEARCH LA English DT Article ID CYCLIC ACETALS; ALDOSIDES; ALDOSES AB Sugar isopropylidene and benzylidene derivatives can be readily deprotected under nonaqueous conditions by treatment of a dichloromethane solution of the protected sugar with an excess of a sacrificial glycol in the presence of a catalytic amount of p-toluenesulfonic acid. The reaction is conveniently monitored by GLC, and the fully or partially deprotected product precipitates from solution. RP ANDREWS, MA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 9 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0008-6215 J9 CARBOHYD RES JI Carbohydr. Res. PD MAY 14 PY 1992 VL 229 IS 1 BP 141 EP 147 DI 10.1016/S0008-6215(00)90486-5 PG 7 WC Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA HW844 UT WOS:A1992HW84400011 ER PT J AU COOK, R WILEMSKI, G AF COOK, R WILEMSKI, G TI PACKING CONSTRAINTS AND NUMBER DEPENDENCE IN SIMULATIONS OF SHEARED COLLOIDAL SUSPENSIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NONEQUILIBRIUM MOLECULAR-DYNAMICS; PAIR-CORRELATION-FUNCTION; CONCENTRATED SUSPENSIONS; BROWNIAN DYNAMICS; FLOW; PARTICLES; RHEOLOGY; LIQUID; ORIGINS AB The system size dependence of the shear viscosity of a strongly interacting, electrostatically stabilized colloidal suspension was studied using nonequilibrium Brownian dynamics simulations. Systems ranging in size from 59 to 500 particles were examined at a constant volume fraction of 0.4. Continuous shear thinning and a highly ordered string phase were found for a 256-particle system over the entire range of shear rates used. This contrasts sharply with the behavior of a 108-particle system, which undergoes a transition to a disordered, more highly viscous state at lower shear rates. Simulations of a 500-particle system over a restricted range of shear rates also revealed a highly ordered string phase, but gave viscosities clearly higher than those of the 256-particle system. At a shear rate favoring highly ordered particle arrangements, the excess shear viscosity and the type of ordered structure of the suspension varied erratically with increasing system size. This behavior was attributed to geometric restrictions on the types of ordered particle arrangements permitted. These constraints arise because the simulation box dimensions vary slowly in comparison to the relatively rapid discrete increases in the number of particles. Thus, drastic changes in suspension structure are often required in order to accommodate even one additional particle in a box whose dimensions have increased only slightly. C1 PHYS SCI INC,ANDOVER,MA 01810. RP COOK, R (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 32 TC 16 Z9 16 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 MAY 14 PY 1992 VL 96 IS 10 BP 4023 EP 4027 DI 10.1021/j100189a021 PG 5 WC Chemistry, Physical SC Chemistry GA HV240 UT WOS:A1992HV24000021 ER PT J AU SAUERS, I HARMAN, G AF SAUERS, I HARMAN, G TI A MASS-SPECTROMETRIC STUDY OF POSITIVE AND NEGATIVE-ION FORMATION IN AN SF6 CORONA .1. SOURCES OF SULFUR-FLUORIDE IONS SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID SULFUR-HEXAFLUORIDE; ELECTRON; IONIZATION; DISCHARGES; TRANSPORT; MIXTURES; SILICON; DECOMPOSITION; COEFFICIENTS; DETACHMENT AB The mass spectra of positive ions generated in a positive high-voltage point-to-plane corona and negative ions generated in a negative high-voltage point-to-plane corona in high-purity SF6 are reported. In the absence of added impurities the major positively- and negatively-charged ions are SF5+, SF3+, SF2+ SF+, SF6-, SF5- and F-. Evidence for the formation of SF6 corona discharge neutral by-products, SF4 and SF2, is observed from the presence of cluster ions. SF(x)+ (SF4) and SF(x)+ (SF2), x = 2, 3. Based on analyses of predicted ion intensities from cross-section data, SF2+ and SF+ ions are attributed to SF2 in the discharge, while most of the SF3+ observed is attributed to SF4. In the case of negative ions, analyses indicate that F- is formed in the discharge at high-density normalized electric field, E/N, from both dissociative attachment of SF6 and ion conversion processes, while SF6- and SF5- are likely to be formed outside the glow. Other ions observed resulting from the presence of trace contaminants include SOF3+, SOF2+, SOF+, SOF5- and F-(HF)2. In this paper (part I) the various sources of ions produced in 'pure' SF6 Corona are discussed while in part II the effects of water and SF6 neutral corona by-products on ion formation are discussed. RP SAUERS, I (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 46 TC 36 Z9 36 U1 1 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD MAY 14 PY 1992 VL 25 IS 5 BP 761 EP 773 DI 10.1088/0022-3727/25/5/005 PG 13 WC Physics, Applied SC Physics GA HW398 UT WOS:A1992HW39800005 ER PT J AU SAUERS, I HARMAN, G AF SAUERS, I HARMAN, G TI A MASS-SPECTROMETRIC STUDY OF POSITIVE AND NEGATIVE-ION FORMATION IN AN SF6 CORONA .2. INFLUENCE OF WATER AND SF6 NEUTRAL BY-PRODUCTS SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID ELECTRON DETACHMENT; PHASE; DISCHARGES; COLLISIONS; ANIONS; RATES; SOF4 AB The effects of water and SF6 by-products on both positive and negative ion formation in an SF6 Corona have been examined. For a positive corona for 'pure' SF6 at p = 6.5 kPa the primary ions observed are SF5+, SF3+ and SF2+, with water addition (in the range 0-640 ppm) ion conversion and clustering occurs leading to H+(H2O)n, (n = 1-4), SF5+(H2O)n, (n = 0-2), SOF+3(H2O)n, (n = 0-2). For a negative corona for 'pure' SF6, the primary ions observed are SF6-, SF5- and F-, with water addition ion conversion and clustering also occurs leading to F-(HF)n, (n = 0-4), OH-(H2O)n, (n = 0-2), SOF5-(HF)n (n = 0, 1), SF6-(HF)n, (n = 0, 1), SO2F- and SO2F2-, where HF is a neutral by-product of the SF6/H2O corona. Of these ions OH-(H2O)n is considered a possible 'seed' ion for collisional electron detachment in an SF6/H2O corona. It is shown that by-product formation such as the production of SOF4, even when present at trace levels, will lead to significant modifications to the negative ion content. RP SAUERS, I (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 30 TC 26 Z9 27 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD MAY 14 PY 1992 VL 25 IS 5 BP 774 EP 782 DI 10.1088/0022-3727/25/5/006 PG 9 WC Physics, Applied SC Physics GA HW398 UT WOS:A1992HW39800006 ER PT J AU FENIMORE, EE EPSTEIN, RI HO, C KLEBESADEL, RW LAROS, J AF FENIMORE, EE EPSTEIN, RI HO, C KLEBESADEL, RW LAROS, J TI NECESSITY OF EVOLUTION IN COSMOLOGICAL GAMMA-RAY BURSTS SO NATURE LA English DT Article AB RESULTS from the Burst and Transient Source Experiment (BATSE) 1 on the Compton Gamma-Ray Observatory show a relative deficiency of faint gamma-ray bursts without any detectable anisotropy. This gives strong support to suggestions that the bursts originate at cosmological distances 2, such that cosmic expansion reduces the detectability of faint (and therefore distant) sources relative to a uniformly filled euclidean space. But the Pioneer Venus Orbiter (PVO) observations of brighter bursts show no such deficiency, indicating that the bursts that it sees are at redshifts less than about one. The best-fit cosmological model based on PVO data (peak luminosity L0 = 2 x 10(50) erg s-1) with no evolution of the source population predicts, when extrapolated to the fainter sources, a factor of 40 more events than BATSE sees. Even the 3-sigma-limit from PVO (L0 = 9.1 X 10(51) erg s-1) is barely consistent with the BATSE result. Evolution of the cosmological gamma-ray burst sources with epoch therefore seems necessary if the PVO and BATSE data are to be reconciled. The required evolutionary trend is for fewer or fainter bursts at larger redshift. RP FENIMORE, EE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MS D436,LOS ALAMOS,NM 87545, USA. NR 13 TC 36 Z9 36 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 14 PY 1992 VL 357 IS 6374 BP 140 EP 141 DI 10.1038/357140a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HU122 UT WOS:A1992HU12200050 ER PT J AU BRANDAN, ME MCVOY, KW SATCHLER, GR AF BRANDAN, ME MCVOY, KW SATCHLER, GR TI ANALYSIS OF AN UNUSUAL POTENTIAL AMBIGUITY FOR O-16 PLUS O-16 SCATTERING SO PHYSICS LETTERS B LA English DT Article ID NUCLEAR RAINBOW AB Woods-Saxon optical-potential fits to recent measurements of O-16 + O-16 elastic scattering at 350 MeV have been interpreted as providing clear evidence for a nuclear rainbow. Three model-independent potentials have also recently been found to reproduce these data. Two of them were indeed found to be members of a rainbow series, in which a distinctive minimum near 44-degrees is the first or second Airy minimum of a rainbow pattern, but the scattering by the third (shallower) potential was less easy to interpret. We show here that this potential achieves its fit to the data by a different and somewhat unconventional mechanism. This serves as a reminder that ambiguities in interpretation can persist, even with as extensive and accurate a data set as this measurement provides. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP BRANDAN, ME (reprint author), NATL AUTONOMOUS UNIV MEXICO,INST FIS,MEXICO CITY 04510,DF,MEXICO. RI Brandan, Maria-Ester/K-9014-2012 OI Brandan, Maria-Ester/0000-0002-1165-3440 NR 14 TC 21 Z9 21 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 14 PY 1992 VL 281 IS 3-4 BP 185 EP 190 DI 10.1016/0370-2693(92)91126-T PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA781 UT WOS:A1992JA78100003 ER PT J AU GOLDMAN, T PEREZMERCADER, J COOPER, F NIETO, MM AF GOLDMAN, T PEREZMERCADER, J COOPER, F NIETO, MM TI THE DARK MATTER PROBLEM AND QUANTUM-GRAVITY SO PHYSICS LETTERS B LA English DT Article AB We explicitly solve the one-loop renormalization group equations for a particular higher derivative quant im gravity and obtain the induced r-dependence of Newton's constant due to quantum fluctuations of the geometry. We then show how, by considering these effects, it may be possible to (a) reconcile nucleosynthesis bounds on the density parameter of the Universe with the predictions of inflationary cosmology, and (b) reproduce the inferred variation of the density parameter with distance. Our calculation can be interpreted as a computation of the contribution of gravitons to the (local) energy density of the Universe. C1 CSIC, INST FIS FUNDAMENTAL, E-28006 MADRID, SPAIN. RP GOLDMAN, T (reprint author), LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 18 TC 73 Z9 73 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 14 PY 1992 VL 281 IS 3-4 BP 219 EP 224 DI 10.1016/0370-2693(92)91132-S PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA781 UT WOS:A1992JA78100009 ER PT J AU MOLLERACH, S ROULET, E AF MOLLERACH, S ROULET, E TI LOW-TEMPERATURE BARYOGENESIS AND THE AXION SUPERMULTIPLET SO PHYSICS LETTERS B LA English DT Article ID ELECTRIC-DIPOLE MOMENT; BARYON-NUMBER; NEUTRINO MASSES; CP VIOLATION; UNIVERSE; SUPERGRAVITY; SEARCH; SCALE AB We consider the possibility that the baryon asymmetry is generated at low temperatures as a consequence of the decay of one of the supermultiplet axion companions: the axino or the saxino. We analyse models in which these particles are heavy and decay producing gluinos at temperatures T is similar-to 1 GeV. If CP and B violating couplings for the quark superfields are included, the subsequent decay of these out of equilibrium gluinos can act as seeds for baryogenesis. The most attractive features of this scenario are that the required amount of CP violation is small, well consistent with the bounds on the electric dipole moment of the neutron. and the mechanism works even for low reheating temperatures after inflation (T(RH) greater than of similar to 10(4) GeV). RP MOLLERACH, S (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 31 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 14 PY 1992 VL 281 IS 3-4 BP 303 EP 308 DI 10.1016/0370-2693(92)91145-Y PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA781 UT WOS:A1992JA78100022 ER PT J AU MASIERO, A PAKVASA, S ROULET, E TATA, X AF MASIERO, A PAKVASA, S ROULET, E TATA, X TI AN UNMIXED 17-KEV NEUTRINO SO PHYSICS LETTERS B LA English DT Article ID LEFT-RIGHT-SYMMETRY; HEAVY-NEUTRINO; BETA-DECAY; SEARCH; SUPERNOVA; EMISSION; SN1987A; S-35 AB We argue that the observation of the kink in the electron energy spectrum in beta-decay does not necessarily imply mixing amongst the neutrinos. We have constructed a model in which the kink occurs because the neutron can also beta-decay into an isosinglet neutrino (with a Dirac mass of 17 keV) via a new interaction mediated by spin zero, Q = -1/3 leptoquarks with a mass of 100-1000 1000 GeV. Our model can be tested by modest improvements in the measurement of the longitudinal polarisation of electrons in beta-decay and in the branching fraction of the pion decay to electron. Astrophysical and cosmological implications of this new interaction of neutrinos are also discussed. C1 UNIV HAWAII,DEPT PHYS & ASTRON,HONOLULU,HI 96822. NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP MASIERO, A (reprint author), IST NAZL FIS NUCL,I-35131 PADUA,ITALY. NR 53 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 MAY 14 PY 1992 VL 281 IS 3-4 BP 351 EP 356 DI 10.1016/0370-2693(92)91154-2 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA781 UT WOS:A1992JA78100031 ER PT J AU IM, CJC AF IM, CJC TI MINIMALLY GAUGED CHIRAL LAGRANGIAN PREDICTION FOR GAMMA-GAMMA-]PI-0-PI-0 IN A 1/N EXPANSION SO PHYSICS LETTERS B LA English DT Article ID PERTURBATION-THEORY; COLLISIONS AB The general chiral lagrangian prediction for gamma-gamma --> pi-0-pi-0 is perturbatively expanded in powers of 1/N(f), where N(f) is the number of pion fields. The resulting amplitude is chirally invariant and is unitary to all orders in momenta. Although the leading order calculation involves an infinite number of unknown coefficients. the final result depends only on the pi-pi scattering amplitude. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. RP IM, CJC (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 25 TC 15 Z9 15 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 MAY 14 PY 1992 VL 281 IS 3-4 BP 357 EP 363 DI 10.1016/0370-2693(92)91155-3 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA781 UT WOS:A1992JA78100032 ER PT J AU ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG 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 BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM 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 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 CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R 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 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 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 EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P 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 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 HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HECK, BW 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 KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KRAMER, PH KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W 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 LETESSIERSELVON, A LIEB, E LIKO, D LILLETHUN, E LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LLOSA, R 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 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 OBRAZTSOV, V OESTERBERG, K OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A 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, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C 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 VISHNEVSKY, N VITALE, L VLASOV, E VLASSOPOULOS, S 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 ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG 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 BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM 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 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 CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R 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 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 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 EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P 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 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 HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HECK, BW 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 KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KRAMER, PH KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W 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 LETESSIERSELVON, A LIEB, E LIKO, D LILLETHUN, E LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LLOSA, R 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 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 OBRAZTSOV, V OESTERBERG, K OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A 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, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C 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 VISHNEVSKY, N VITALE, L VLASOV, E VLASSOPOULOS, S 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 ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI MEASURING OF THE Z(0)BRANCHING FRACTION TO B QUARK PARIS USING THE BOOSTED SPHERICITY PRODUCT SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E ANNIHILATION; PHYSICS; DECAYS AB From a sample of about 120 000 hadronic Z0 decays, using a technique based on a separation of the different event categories in the boosted sphericity product, the fraction of bbBAR decays has been measured to be 0.219 +/- 0.014 (stat) +/- 0.019 (syst). Using the DELPHI determination of the hadronic Z0 width, this corresponds to a partial width GAMMA(bbBAR) = 378 +/- 42 MeV (in good agreement with the standard model prediction of congruent-to 380 N eV). Combining this measurement with the determinations based on events with high p(t) leptons gives an estimate for the branching ratio of b into leptons at LEP of (11.2 +/- 1.2)%, consistent with previous determinations. C1 AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. CENS,DEPT PHYS PARTICULES ELEMENT,F-91191 GIF SUR YVETTE,FRANCE. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. JOINT INST NUCL RES DUBNA,MOSCOW 101000,USSR. UNIV VALENCIA,CSIC,INST FIS CORPUSCULAR,CTR MIXTO,VALENCIA,SPAIN. UNIV VALENCIA,DEPT FIS ATOM MOLEC & NUCL,VALENCIA,SPAIN. UNIV BERGAN,DEPT PHYS,N-5007 BERGEN,NORWAY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE,GERMANY. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. NATL INST NUCL & HIGH ENERGY PHYS,SECT K,1009 DB AMSTERDAM,NETHERLANDS. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 ST MARTIN DHERES,FRANCE. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV PARIS 06,PHYS CHIM & PHYS MAT LAB,F-75230 PARIS 05,FRANCE. UNIV PARIS 07,F-75230 PARIS 05,FRANCE. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. INST HIGH ENERGY PHYS SERPUKHOV,PROTVINO 142284,USSR. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. GRP DELPHI,CRN,DIV HAUTES ENERGIES,F-67037 STRASBOURG,FRANCE. LEPSI,F-67037 STRASBOURG,FRANCE. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VRIJE UNIV BRUSSELS,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,SERV PHYS PARTICULES ELEMENTAIRES,B-7000 MONS,BELGIUM. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL TOR VERGATA,I-00173 ROME,ITALY. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV HELSINKI,DEPT HIGH ENERGY PHYS,SF-00170 HELSINKI 17,FINLAND. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. NIEL BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV AIX MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. RP ABREU, P (reprint author), LIP,AV ELIAS GARCIA 14 LE,P-1000 LISBON,PORTUGAL. RI Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; 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; 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; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; 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; 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; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Zaitsev, Alexandre/B-8989-2017 OI 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; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Dracos, Marcos/0000-0003-0514-193X; 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; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Zaitsev, Alexandre/0000-0002-4961-8368 NR 28 TC 11 Z9 11 U1 0 U2 6 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 MAY 14 PY 1992 VL 281 IS 3-4 BP 383 EP 393 DI 10.1016/0370-2693(92)91159-7 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA781 UT WOS:A1992JA78100036 ER PT J AU SEVOV, SC CORBETT, JD AF SEVOV, SC CORBETT, JD TI SYNTHESIS, CHARACTERIZATION, AND BONDING OF INDIUM CLUSTERS - NA7IN11.8, A NOVEL NETWORK STRUCTURE CONTAINING CLOSO-IN16 AND NIDO-IN11 CLUSTERS SO INORGANIC CHEMISTRY LA English DT Article ID RAY CRYSTAL-STRUCTURE; INTERMETALLIC PHASES; ALKALI-METALS; RESISTIVITY; ELEMENTS; GALLIUM AB Reactions of the elements in proportions near 37.3 at. % Na at approximately 500, 410, and then 250-degrees-C readily produce the well-crystallized title phase. The tetragonal structure at the indium-rich limit was solved by standard single-crystal X-ray means at room temperature (P4(2)/nmc, Z = 12; a = 16.093 (4) angstrom, c = 23.384 (8) angstrom; R(F)/R(W) = 3.4/3.6%). The network structure consists of interbonded clusters-the first example of closo-In16 icosioctahedra (4m2BAR symmetry) that are 8-exo-bonded, 10-bonded nido icosahedra (fractional occupancy of the eleventh cluster site generates approximately 36% 1,3-arachno units) and four-bonded indium atoms in pairs of triangles (In16:In11(10):In1 = 1:4:12). Extended Huckel calculations that include significant interactions between directional nonbonding pairs on atoms in neighboring In16 and In11 units indicate 2n + 4 skeletal electrons are necessary for each, with no nonbonding pairs on the latter, and a closed shell for 504 electrons per cell vs 507 for the refined stoichiometry. Observed properties are in good agreement; at the indium-rich limit, the phase is a poor metal (rho-295 approximately 540-mu-OMEGA.cm) with a Pauli-like paramagnetism chi(M) = (1.7 - 1.8) X 10(-4) emu/mol after correction for core and orbital diamagnetism. The intercluster interactions appear to be closely correlated with a small region of nonstoichiometry and changes in the c lattice parameter. Some general factors in a diverse indium cluster chemistry are noted. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,DOE,AMES,IA 50011. NR 41 TC 86 Z9 87 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 13 PY 1992 VL 31 IS 10 BP 1895 EP 1901 DI 10.1021/ic00036a032 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HU743 UT WOS:A1992HU74300032 ER PT J AU MA, R BAKAC, A ESPENSON, JH AF MA, R BAKAC, A ESPENSON, JH TI KINETICS OF OXIDATION OF VANADIUM(IV) BY ALKYL HYDROPEROXIDES IN ACIDIC, AQUEOUS-SOLUTION SO INORGANIC CHEMISTRY LA English DT Article ID ELECTRON-SPIN RESONANCE; HYDROGEN-PEROXIDE; MICROSOMAL-MEMBRANES; STIMULATED OXIDATION; NADH OXIDATION; VANADATE; MECHANISM; COMPLEXES; RADICALS; IONS AB The title reactions produce VO2+ and products derived from beta-scission of alkoxy radicals, largely acetone, ethane, and methane (tert-butyl hydroperoxide) or ethane, ethylene, and n-butane (tert-amyl hydroperoxide). Thc minor amounts of methane from the first reaction and the excess amount of ethane from the second suggest a small contribution from the oxidation of VO2+ by .CH3 and .C2H5, respectively. Thc kinetic dependence of the main reaction upon [H+] is consistent with the formation of an intermediate OVOOR+ present at steady-state concentrations. This intermediate produces VO2+ and RO. in a rate-limiting step. The yield of VO2+ is stoichiometric in the t-AmOOH reaction, whereas only about half this amount of VO2+ is produced from t-BuOOH. Although chloride ions affect neither reaction, Br- changes the stoichiometry, products, and kinetics of the t-BuOOH reaction, but not those of the t-AmOOH reaction. These differences are accounted for by the relative reactivities of the intermediate alkoxy medicals, RO., toward beta-scission versus bromide oxidation. Addition of alcohols with alpha-H's (i.e., CH3OH, C2H5OH, (CH3)2CHOH) does not affect VO2+ production from t-AmOOH but does prevent VO2+ formation from t-BuOOH because VO2+ is reduced by the alcohol radical formed in the reaction between t-BuO. and ROH. Several models are suggested, all of which feature beta-scission of t-BuO. and t-AmO.. The data pertaining to products and stoichiometry suggest an interaction or complexation of VO2+ by t-BuOOH (but not t-AmOOH), which is supported by product yields, ion-exchange isolation, and spectroscopic evidence. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 49 TC 16 Z9 16 U1 0 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 MAY 13 PY 1992 VL 31 IS 10 BP 1925 EP 1930 DI 10.1021/ic00036a037 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HU743 UT WOS:A1992HU74300037 ER PT J AU MAYA, L AF MAYA, L TI PREPARATION OF TIN NITRIDE VIA AN AMIDE IMIDE INTERMEDIATE SO INORGANIC CHEMISTRY LA English DT Note ID PYROLYSIS RP MAYA, L (reprint author), OAK RIDGE NATL LAB,DIV CHEM,BLDG 45005,MS-6119,POB 2008,OAK RIDGE,TN 37831, USA. NR 16 TC 24 Z9 24 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 MAY 13 PY 1992 VL 31 IS 10 BP 1958 EP 1960 DI 10.1021/ic00036a044 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HU743 UT WOS:A1992HU74300044 ER PT J AU NELSON, JE CLARK, DL BURNS, CJ SATTELBERGER, AP AF NELSON, JE CLARK, DL BURNS, CJ SATTELBERGER, AP TI SYNTHESIS, CHARACTERIZATION, AND X-RAY STRUCTURE OF ([K(THF)2]2[U(NH-2,6-I-PR2C6H3)5])BULLET-THF SO INORGANIC CHEMISTRY LA English DT Note ID TRIVALENT URANIUM; ION-PAIR; CHEMISTRY; COMPLEX; DERIVATIVES; OXIDATION; CRYSTAL; ANION; ETHER C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM INC-4,INORGAN & STRUCT CHEM GRP,LOS ALAMOS,NM 87545. CALTECH,PASADENA,CA 91125. RI Clark, David/A-9729-2011 NR 29 TC 28 Z9 28 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 MAY 13 PY 1992 VL 31 IS 10 BP 1973 EP 1976 DI 10.1021/ic00036a050 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HU743 UT WOS:A1992HU74300050 ER PT J AU TORTORELLI, LJ FLOWERS, PA HARWARD, BL MAMANTOV, G KLATT, LN AF TORTORELLI, LJ FLOWERS, PA HARWARD, BL MAMANTOV, G KLATT, LN TI SPECTROSCOPIC INVESTIGATIONS OF CATALYTIC IRIDIUM CARBONYL SPECIES IN SODIUM CHLORALUMINATE MELTS SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID FISCHER-TROPSCH SYNTHESIS; MONOXIDE HYDROGENATION; RUTHENIUM COMPLEXES; METAL CLUSTERS; HIGH-PRESSURE; BASICITY; SYSTEM AB In situ spectroscopic studies of the iridium chemistry occurring during the catalytic hydrogenation of carbon monoxide employing IrCl(CO)3 and Ir4(CO)12 in an aluminum chloride-sodium chloride (63:37 mole%) melt were performed. Infrared, UV-visible, Raman, and H-1 NMR data indicate that similar monomeric species are generated during catalysis. Infrared investigation of the introduction of IrCl(CO)3 into molten AlCl3:NaCl (63:37) under CO:H-2 (1:3 mole ratio) and the reaction between IrCl(CO)3 and carbon monoxide in an acidic melt suggest the initial formation of an iridium-carbonyl species followed by the generation of a hydridocarbonyl complex in the initial stage of the catalysis. Infrared data also indicate that the method of introduction for Ir4(CO)12 into the AlCl3:NaCl medium under 1 atm of CO:H-2 (1:3 mole ratio) has a marked effect on the spectra observed. In an acidic melt IrCl(CO)3 reacts with hydrogen to form hydrogen chloride, methane and metallic iridium. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 39 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 12 PY 1992 VL 429 IS 1 BP 119 EP 134 DI 10.1016/0022-328X(92)83322-9 PG 16 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HW599 UT WOS:A1992HW59900009 ER PT J AU CHASON, E MAYER, TM PAYNE, A WU, D AF CHASON, E MAYER, TM PAYNE, A WU, D TI INSITU ENERGY DISPERSIVE-X-RAY REFLECTIVITY MEASUREMENTS OF H ION-BOMBARDMENT ON SIO2/SI AND SI SO APPLIED PHYSICS LETTERS LA English DT Article ID THIN-FILMS; SILICON; DAMAGE AB We have performed in situ, energy-dispersive x-ray reflectivity measurements of damage layer formation and surface roughness of thin films of SiO2 on Si and clean Si during H ion bombardment. The reflectivity was analyzed using an optical multilayer model where the variable parameters are the number of layers, the thickness and density of the layers, and the surface roughness. Room temperature ion bombardment at doses < 5 X 10(17)/cm2 results in a buried layer between the oxide and the substrate; 300 eV bombardment produces a very thin, low-density layer, while 1000 eV bombardment produces a thicker layer with the density of amorphous silicon. A damaged layer is not produced by equivalent bombardment at high temperature. Ion bombardment of clean Si surfaces at 500-degrees-C resulted in roughening of the surface on the nanometer scale which is strongly dependent on the ion energy. C1 HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138. RP CHASON, E (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 22 Z9 22 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 11 PY 1992 VL 60 IS 19 BP 2353 EP 2355 DI 10.1063/1.107023 PG 3 WC Physics, Applied SC Physics GA HT679 UT WOS:A1992HT67900012 ER PT J AU CHO, NH KRISHNAN, KM LEE, CH FARROW, RFC AF CHO, NH KRISHNAN, KM LEE, CH FARROW, RFC TI TWIN FORMATION IN AG SEEDED CO/PT MULTILAYERS GROWN ON GAAS BY MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID ANISOTROPY AB Molecular beam epitaxy was used to grow ultrathin Co-Pt multilayers on GaAs (111) substrates with 200 angstrom thick Ag layer as a buffer. Magnetic properties (B-H loop) of the multilayers, measured by a vibrating sample magnetometer, confirmed that these samples exhibit strong anisotropy perpendicular to the film surface. Reflection high energy electron diffraction and low-energy electron diffraction showed that twin-related Ag grains nucleated on the substrates. The epitaxial relationship of the multilayers with respect to the substrate was investigated by high-resolution transmission electron microscopy. Twin-related grains, 30-40 nm in diameter, are present in the multilayers. These twins are generated either by propagation of existing twin boundaries in the Ag layer into the multilayers or by nucleation of twin-related Pt grains on the Ag buffer surface. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. NR 10 TC 4 Z9 4 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 11 PY 1992 VL 60 IS 19 BP 2371 EP 2373 DI 10.1063/1.107029 PG 3 WC Physics, Applied SC Physics GA HT679 UT WOS:A1992HT67900018 ER PT J AU MOLL, AJ YU, KM WALUKIEWICZ, W HANSEN, WL HALLER, EE AF MOLL, AJ YU, KM WALUKIEWICZ, W HANSEN, WL HALLER, EE TI COIMPLANTATION AND ELECTRICAL-ACTIVITY OF C IN GAAS - STOICHIOMETRY AND DAMAGE EFFECTS SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; CARBON; IMPLANTATION AB We have coimplanted carbon and a series of elements (B, N, Al, P, Ar, Ga, As, and Kr) in GaAs to study the effect of both implant damage and stoichiometry on activation. Electrical activity of C was found to increase due to the additional damage caused by coimplantation of a heavy element regardless of the chemical nature of the coimplant. Maintaining stoichiometry by coimplanting a group III element further increased activation in substrates heavily damaged during implantation. Activation of 65 +/- 3%, corresponding to a sheet free-carrier concentration of 3.5 X 10(14) cm-2, was achieved by coimplanting Ga and annealing at 950-degrees-C for 10 s. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP MOLL, AJ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 20 TC 30 Z9 30 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 MAY 11 PY 1992 VL 60 IS 19 BP 2383 EP 2385 DI 10.1063/1.107004 PG 3 WC Physics, Applied SC Physics GA HT679 UT WOS:A1992HT67900022 ER PT J AU JONG, L PEARCE, EM KWEI, TK HAMILTON, WA SMITH, GS KWEI, GH AF JONG, L PEARCE, EM KWEI, TK HAMILTON, WA SMITH, GS KWEI, GH TI NEUTRON REFLECTIVITY STUDY OF THIN-FILMS OF HYDROGEN-BONDED POLYMER BLENDS - INFLUENCE OF ANNEALING ON COMPOSITION PROFILE SO MACROMOLECULES LA English DT Article AB We have investigated the plane average composition profile of a hydrogen-bonded polymer blend consisting of poly(styrene-co-vinylphenol), MPS-5, and deuterated poly(methyl methacrylate), d-PMMA. The results indicate changes in the composition profile after the thin film has been annealed at 170-degrees-C. After annealing for 3 h, the initially homogeneous blend under goes phase separation into a layer containing 68% (by volume) MPS-5 near the polymer/substrate interface and a layer dominated by d-PMMA at the air/polymer interface, with a broad region of concentration change in between. With further annealing, the d-PMMA-rich layer becomes thicker at the expense of the MPS-5 layer. After annealing for a total a 19.5 h at 170-degrees-C and 7 h at 185-degrees-C, the interface of polymer/air has a composition of 64% d-PMMA by volume while the polymer/substrate interface contains 70% MPS-5. The remixing of separated phases was caused by the degradation of MPS-5 as indicated by the GPC results. C1 POLYTECH INST NEW YORK,POLYMER RES INST,BROOKLYN,NY 11201. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 15 TC 3 Z9 3 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 11 PY 1992 VL 25 IS 10 BP 2619 EP 2623 DI 10.1021/ma00036a010 PG 5 WC Polymer Science SC Polymer Science GA HU782 UT WOS:A1992HU78200010 ER PT J AU GINOCCHIO, JN FRANK, W VONBRENTANO, P AF GINOCCHIO, JN FRANK, W VONBRENTANO, P TI M1-MATRIX ELEMENTS AND F-SPIN SYMMETRY IN NUCLEI SO NUCLEAR PHYSICS A LA English DT Article ID INTERACTING-BOSON MODEL; INELASTIC ELECTRON-SCATTERING; LOW-LYING LEVELS; M1 TRANSITIONS; PROTON; STATES; PHOTOEXCITATION; MULTIPLETS; GD-156 AB In this paper we test the sensitivity of different matrix elements to F-spin admixtures in nuclei. Exact calculations of neutron and proton matrix elements are compared to those in the intrinsic formalism. C1 MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. RP GINOCCHIO, JN (reprint author), LOS ALAMOS NATL LAB,DIV INFECT DIS,T-5,B283,LOS ALAMOS,NM 87545, USA. NR 37 TC 17 Z9 17 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 MAY 11 PY 1992 VL 541 IS 2 BP 211 EP 225 DI 10.1016/0375-9474(92)90094-Z PG 15 WC Physics, Nuclear SC Physics GA JA282 UT WOS:A1992JA28200003 ER PT J AU COLONNA, M COLONNA, N BONASERA, A DITORO, M AF COLONNA, M COLONNA, N BONASERA, A DITORO, M TI EQUILIBRIUM FEATURES AND DYNAMIC INSTABILITIES IN NUCLEAR FRAGMENTATION SO NUCLEAR PHYSICS A LA English DT Article ID COLLISIONS; EMISSION; FLUCTUATIONS; EQUATION AB We study equilibrium and non-equilibrium features of complex fragment production in medium-energy heavy-ion collisions. We consider first statistical sequential emission from equilibrated primary sources formed in the entrance-channel dynamics. The inputs of cascade calculations are derived from a suitable clustering procedure at some carefully fixed equilibration time. Large pre-equilibrium dissipation is revealed. Applications are shown to the reactions Kr-84+Al-27 at 34.4 MeV/u, and La-139+Al-27 and La-139+Cu-63 at 55 MeV/u beam energies. Absolute comparisons with experiments show a quite good overall agreement. Some discrepancies revealed at higher energies, for high multiplicity events and when a larger excitation energy is available, appear as a signature of the onset of a direct multifragmentation mechanism. A microscopic study of the nuclear-matter phase diagram in the participant zone seems to relate this multifragment emission to dynamical instabilities. C1 UNIV CATANIA, DIPARTIMENTO FIS, 57 CORSO ITALIA, I-95129 CATANIA, ITALY. IST NAZL FIS NUCL, LAB NAZL SUD, CATANIA, ITALY. IST NAZL FIS NUCL, I-95129 CATANIA, ITALY. LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. NR 31 TC 54 Z9 54 U1 0 U2 4 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 MAY 11 PY 1992 VL 541 IS 2 BP 295 EP 317 DI 10.1016/0375-9474(92)90098-5 PG 23 WC Physics, Nuclear SC Physics GA JA282 UT WOS:A1992JA28200007 ER PT J AU BURKS, C CINKOSKY, MJ FISCHER, WM GILNA, P HAYDEN, JED KEEN, GM KELLY, M KRISTOFFERSON, D LAWRENCE, J AF BURKS, C CINKOSKY, MJ FISCHER, WM GILNA, P HAYDEN, JED KEEN, GM KELLY, M KRISTOFFERSON, D LAWRENCE, J TI GENBANK SO NUCLEIC ACIDS RESEARCH LA English DT Article ID SEQUENCE AB The GenBank nucleotide sequence database now contains sequence data and associated annotation corresponding to 85,000,000 nucleotides in 67,000 entries from a total of 3,000 organisms. The input stream of data coming into the database is primarily as direct submissions from the scientific community on electronic media, with little or no data being keyboarded from the printed page by the databank staff. The data are maintained in a relational database management system and are made available in flatfile form through on-line access, and through various network and off-line computer-readable media. The data are also distributed in relational form through satellite copies at a number of institutions in the U.S. and elsewhere. In addition, GenBank provides the U.S. distribution center for the BIOSCI electronic bulletin board service. C1 LOS ALAMOS NATL LAB, THEORET BIOL & BIOPHYS GRP, T-10, MS K710, LOS ALAMOS, NM 87545 USA. INTELLIGENET INC, MT VIEW, CA 94040 USA. FU NIGMS NIH HHS [N01-GM-7-2110] NR 18 TC 39 Z9 39 U1 0 U2 0 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 EI 1362-4962 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 11 PY 1992 VL 20 SU S BP 2065 EP 2069 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HY931 UT WOS:A1992HY93100006 PM 1598235 ER PT J AU OLSEN, GJ OVERBEEK, R LARSEN, N MARSH, TL MCCAUGHEY, MJ MACIUKENAS, MA KUAN, WM MACKE, TJ XING, YQ WOESE, CR AF OLSEN, GJ OVERBEEK, R LARSEN, N MARSH, TL MCCAUGHEY, MJ MACIUKENAS, MA KUAN, WM MACKE, TJ XING, YQ WOESE, CR TI THE RIBOSOMAL DATABASE PROJECT SO NUCLEIC ACIDS RESEARCH LA English DT Article ID COMPILATION; SEQUENCES; RNA AB The Ribosomal Database Project (RDP) compiles ribosomal sequences and related data, and redistributes them in aligned and phylogenetically ordered form to its user community. It also offers various software packages for handling, analyzing and displaying sequences. In addition, the RDP offers (or will offer) certain analytic services. At present the project is in an intermediate stage of development. C1 UNIV ILLINOIS, DEPT MICROBIOL, 131 BURRILL HALL, 407 S GOODWIN AVE, URBANA, IL 61801 USA. ARGONNE NATL LAB, DIV MATH & COMP SCI, ARGONNE, IL 60439 USA. SCRIPPS RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. NR 9 TC 209 Z9 210 U1 2 U2 11 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 MAY 11 PY 1992 VL 20 SU S BP 2199 EP 2200 PG 2 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HY931 UT WOS:A1992HY93100017 PM 1598241 ER PT J AU YEN, RWC VERTINO, PM NELKIN, BD YU, JJ ELDEIRY, W CUMARASWAMY, A LENNON, GG TRASK, BJ CELANO, P BAYLIN, SB AF YEN, RWC VERTINO, PM NELKIN, BD YU, JJ ELDEIRY, W CUMARASWAMY, A LENNON, GG TRASK, BJ CELANO, P BAYLIN, SB TI ISOLATION AND CHARACTERIZATION OF THE CDNA-ENCODING HUMAN DNA METHYLTRANSFERASE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID CHROMATIN STRUCTURE; METHYLATION; CELLS; EXPRESSION; MOUSE AB We have cloned a series of overlapping cDNA clones encoding a 5194 bp transcript for human DNA methyltransferase (DNA MTase). This sequence potentially codes for a protein of 1495 amino acids with a predicted molecular weight of 169 kDa. The human DNA MTase cDNA has eighty percent homology at the nucleotide level, and the predicted protein has seventy-four percent identity at the amino acid level, to the DNA MTase cDNA cloned from mouse cells. Like the murine DNA MTase, the amino terminal two-thirds of the human protein contains a cysteine-rich region suggestive of a metal-binding domain. The carboxy terminal one-third of the protein shows considerable similarity to prokaryotic (cytosine-5)-methyltransferases. The arrangement of multiple motifs conserved in the prokaryotic genes is preserved in the human DNA MTase, including the relative position of a prolinecysteine dipeptide thought to be an essential catalytic site in all (cytosine-5)-methyltransferases. A single 5.2 kb transcript was detected in all human tissues tested, with the highest levels of expression observed in RNA from placenta, brain, heart and lung. DNA MTase cDNA clones were used to screen a chromosome 19 genomic cosmid library. The DNA MTase-positive cosmids which are estimated to span a genomic distance of 93 kb have, been localized to 19p13.2-p13.3 by fluorescence in situ hybridization. Isolation of the cDNA for human DNA MTase will allow further study of the regulation of DNA MTase expression, and of the role of this enzyme in establishing DNA methylation patterns in both normal and neoplastic cells. C1 JOHNS HOPKINS MED INST,DEPT MED,BALTIMORE,MD 21205. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,CTR HUMAN GENOME,LIVERMORE,CA 94550. RP YEN, RWC (reprint author), JOHNS HOPKINS MED INST,CTR ONCOL,BALTIMORE,MD 21205, USA. FU NCI NIH HHS [R01 CA43318] NR 26 TC 180 Z9 189 U1 0 U2 4 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 11 PY 1992 VL 20 IS 9 BP 2287 EP 2291 DI 10.1093/nar/20.9.2287 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HV127 UT WOS:A1992HV12700011 PM 1594447 ER PT J AU LECHNER, M FREY, B LAUE, F ANTONBOTELLA, J SMITH, CL ANKENBAUER, W SCHMITZ, GG AF LECHNER, M FREY, B LAUE, F ANTONBOTELLA, J SMITH, CL ANKENBAUER, W SCHMITZ, GG TI SWAI, A UNIQUE RESTRICTION ENDONUCLEASE FROM STAPHYLOCOCCUS-WARNERI, WHICH RECOGNIZES 5'-ATTTAAAT-3' SO NUCLEIC ACIDS RESEARCH LA English DT Article ID SEQUENCE; GENOMES; DNA AB A novel class-11 restriction endonuclease designated Swal was purified from Staphylococcus warneri. This enzyme cleaves adenovirus 2 DNA, SV40 DNA and M13mp7 at one site each, but does not cleave lambda, PhiX174, pBR322 or pBR328 DNA. Swal recognizes the octanucleotide sequence 5'-ATTTAAAT-3', cleaving in the center of the recognition sequence creating blunt ended DNA fragments. Swal was used to digest chromosomal DNA from various microorganisms and human cells. C1 BOEHRINGER MANNHEIM GMBH,BIOCHEM RES CTR,NONNENWALD 2,W-8122 PENZBERG,GERMANY. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. NR 19 TC 3 Z9 3 U1 0 U2 0 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 MAY 11 PY 1992 VL 20 IS 9 BP 2293 EP 2296 DI 10.1093/nar/20.9.2293 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HV127 UT WOS:A1992HV12700012 PM 1594448 ER PT J AU JAHNS, A STOCKER, H GREINER, W SORGE, H AF JAHNS, A STOCKER, H GREINER, W SORGE, H TI ANTIPROTON PRODUCTION AND ANNIHILATION IN NUCLEAR COLLISIONS AT 15A GEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; HIGH-ENERGY; STRING DYNAMICS; MODEL; DISTRIBUTIONS; MATTER; FLOW AB We present a calculation of antiproton yields in Si + Al and Si + Au collisions at 14.5A GeV in the framework of the relativistic quantum molecular dynamics approach (RQMD). Multistep processes lead to the formation of high-mass flux tubes. Their decay dominates the initial antibaryon yield. However, the subsequent annihilation in the surrounding baryon-rich matter suppresses the antiproton yield considerably: Two-thirds of all antibaryons are annihilated even for the light Si + Al system. Comparisons with preliminary data of the E802 experiment support this analysis. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP JAHNS, A (reprint author), UNIV FRANKFURT,INST THEORET PHYS,W-6000 FRANKFURT,GERMANY. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 33 TC 44 Z9 44 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 MAY 11 PY 1992 VL 68 IS 19 BP 2895 EP 2897 DI 10.1103/PhysRevLett.68.2895 PG 3 WC Physics, Multidisciplinary SC Physics GA HT648 UT WOS:A1992HT64800010 ER PT J AU NELLIS, WJ MITCHELL, AC MCCANDLESS, PC ERSKINE, DJ WEIR, ST AF NELLIS, WJ MITCHELL, AC MCCANDLESS, PC ERSKINE, DJ WEIR, ST TI ELECTRONIC-ENERGY GAP OF MOLECULAR-HYDROGEN FROM ELECTRICAL-CONDUCTIVITY MEASUREMENTS AT HIGH SHOCK PRESSURES SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSULATOR-METAL TRANSITION; SOLID HYDROGEN; MEGABAR PRESSURES; ULTRAHIGH PRESSURES; PHASE-TRANSITIONS; DEUTERIUM; EQUATION; STATE; COMPRESSION; OXYGEN AB Electrical conductivities were measured for liquid D2 and H-2 shock compressed to pressures of 10-20 GPa (100-200 kbar), molar volumes near 8 cm3/mol, and calculated temperatures of 2900-4600 K. The semiconducting energy gap derived from the conductivities is 12 eV, in good agreement with recent quasiparticle calculations and with oscillator frequencies measured in diamond-anvil cells. RP NELLIS, WJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. RI Weir, Samuel/H-5046-2012 NR 34 TC 91 Z9 93 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 11 PY 1992 VL 68 IS 19 BP 2937 EP 2940 DI 10.1103/PhysRevLett.68.2937 PG 4 WC Physics, Multidisciplinary SC Physics GA HT648 UT WOS:A1992HT64800021 ER PT J AU OLSEN, OH LOMDAHL, PS AF OLSEN, OH LOMDAHL, PS TI INFLUENCE OF STOCHASTIC NOISE ON SELF-ORGANIZED PATTERNS IN A FLUID-MOSAIC MODEL OF MEMBRANES SO PHYSICS LETTERS A LA English DT Article ID GEOMETRY; PROTEINS AB A model combining the Smoluchowski equation for the average density of proteins with Kelvin's cable equation modeling diffusion and electrical potential in a membrane, respectively, is considered. The resulting set of nonlinear diffusion equations, which exhibit self-organized stationary patterns, are examined by numerical computations when stochastic noise is introduced. The final stationary patterns have the lowest possible spatial frequencies corresponding to the presence of essentially a single hump. The effect of noise is to enhance the pattern selection. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP OLSEN, OH (reprint author), NOVO NORDISK RES INST,DEPT BIOSTRUCT,DK-2880 BAGSVAERD,DENMARK. NR 12 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 11 PY 1992 VL 165 IS 2 BP 133 EP 142 DI 10.1016/0375-9601(92)90088-4 PG 10 WC Physics, Multidisciplinary SC Physics GA HV425 UT WOS:A1992HV42500008 ER PT J AU HOSHINO, M ARONS, J GALLANT, YA LANGDON, AB AF HOSHINO, M ARONS, J GALLANT, YA LANGDON, AB TI RELATIVISTIC MAGNETOSONIC SHOCK-WAVES IN SYNCHROTRON SOURCES - SHOCK STRUCTURE AND NONTHERMAL ACCELERATION OF POSITRONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES; GALAXIES-JETS; ISM-INDIVIDUAL (CRAB NEBULA); PULSARS; RADIATION MECHANISMS-CYCLOTRON AND SYNCHROTRON; SHOCK WAVES ID ECLIPSING MILLISECOND PULSAR; EXTRAGALACTIC RADIO-SOURCES; PARTICLE-ACCELERATION; CRAB-NEBULA; HOT SPOTS; MODEL; BINARY; COLLISIONLESS; REMNANTS; PLASMAS AB We study the theoretical properties of relativistic, transverse, magnetosonic collisionless shock waves in electron-positron-heavy ion plasmas of relevance to astrophysical sources of synchrotron radiation. We use both one-dimensional electromagnetic particle-in-cell simulations and quasi-linear theory to examine the spatial and kinetic structure of these nonlinear flows. All the upstream ions are electromagnetically reflected from the shock front, causing the magnetic field strength in the shock to overshoot its final downstream value in a series of long compressional oscillations with wavelengths comparable to the Larmor radius of ions with the rigidity appropriate to the downstream flow. We describe a new process of shock acceleration of nonthermal positrons, in which the gyrating reflected heavy ions dissipate their energy in the form of collectively emitted, left-handed magnetosonic waves which are resonantly absorbed by the positrons immediately behind the ion reflection region. This absorption gives rise to an ultrarelativistic downstream positron spectrum The positrons with energy between gamma-m(e) + c2 and (gamma + d-gamma)m(e) + c2 have a spectrum N(gamma)d-gamma is-proportional-to gamma(-s) with s approximately 2 when the upstream flow energy of the heavy ions exceeds that of the electrons and positrons. When the Lorentz factor of the upstream flow is gamma-1, the power-law part of the downstream positron spectrum extends from gamma = gamma-1, to gamma = (m(ion)/Zm(e +/-)gamma-1. The highest energy positrons have Larmor radii comparable to the thickness of the shock. The efficiency of conversion of flow energy into these highly accelerated particles is about 10% approximately 20%. We argue that the nonthermal acceleration of positrons found here also applies to the partial acceleration of electrons. We also point out another acceleration mechanism which may be important in oblique shocks. We briefly outline applications of these results to the termination shocks of pulsar winds and to the termination shocks of jets emanating from active galactic nuclei. Our kinetic shock acceleration model can account for the spectral range of the synchrotron radiation observed in the Crab Nebula from the infrared through high-energy gamma rays, as well as for the radio emission seen from the hot spots in extragalactic radio sources. We propose that the "wisps" seen in the optical emission from the Crab Nebula are brightness enhancements formed in the compressonal magnetic overshoots formed as part of the shock, so that the structure of the shock terminating the relativistic wind from the Crab pulsar is spatially resolved in this system. This model implies the wind from the pulsar has its energy flux largely in partially ionized iron ions, although pairs form the dominant species by number, with the bulk flow velocity corresponding to Lorentz factor approximately 10(6), and an energy per iron ion corresponding to approximately 20% of the electric potential energy associated with the open field lines of the pulsar. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. NR 68 TC 263 Z9 263 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 MAY 10 PY 1992 VL 390 IS 2 BP 454 EP 479 DI 10.1086/171296 PN 1 PG 26 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HR232 UT WOS:A1992HR23200016 ER PT J AU WEBER, F GLENDENNING, NK AF WEBER, F GLENDENNING, NK TI APPLICATION OF THE IMPROVED HARTLE METHOD FOR THE CONSTRUCTION OF GENERAL RELATIVISTIC ROTATING NEUTRON-STAR MODELS SO ASTROPHYSICAL JOURNAL LA English DT Article DE METHOD-NUMERICAL; RELATIVITY; STARS-NEUTRON; STARS-ROTATION ID MILLISECOND PULSAR; NUMERICAL-METHOD; EQUATION; MATTER; NUCLEAR; STABILITY; MASS AB Models of general relativistic rotating neutron stars, constructed from Hartle's perturbative "slow" rotation formalism of massive relativistic objects, are compared with their counterparts obtained from the exact solution of Einstein's equations. It is found that both methods, perturbative and exact, lead to compatible results down to rotational Kepler periods P(K) almost-equal-to 0.5 ms, a value which is by far smaller than the smallest yet observed pulsar period. This finding rests on the reinvestigation of Hartle's method, (1) supplementing it by a self-consistency condition inherent in the determination of the Kepler frequency, and (2) analyzing carefully sequences of star models near their end points. A collection of 17 representative neutron matter equations of state served as an input. Because of its simple structure, Hartle's method should prove to be a practical tool for testing models of the nuclear equation of state with data on pulsar periods. The form of an approximate empirical formula for the general relativistic Kepler frequency is obtained, and proportionality to the Newtonian expression arises in about equal parts from the equatorial flattening and the frame dragging. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. NR 39 TC 56 Z9 58 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 MAY 10 PY 1992 VL 390 IS 2 BP 541 EP 549 DI 10.1086/171304 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HR232 UT WOS:A1992HR23200024 ER PT J AU KANE, SR MCTIERNAN, J LORAN, J FENIMORE, EE KLEBESADEL, RW LAROS, JG AF KANE, SR MCTIERNAN, J LORAN, J FENIMORE, EE KLEBESADEL, RW LAROS, JG TI STEREOSCOPIC OBSERVATIONS OF A SOLAR-FLARE HARD X-RAY SOURCE IN THE HIGH CORONA SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN-CORONA; SUN-FLARES; SUN-X-RAYS, GAMMA-RAYS ID BREMSSTRAHLUNG RADIATION; SPATIAL STRUCTURE; PHOTON SOURCES; GAMMA-RAYS; DIRECTIVITY; EMISSION; BURSTS; THICK; POLARIZATION; ELECTRONS AB The hard X-ray burst observed on 1984 February 16 (0900 UT) by the 5 keV-3.2 MeV X-ray spectrometry aboard the ICE/ISEE 3 spacescraft was associated with a flare which occurred approximately 40-degrees behind the west limb of the Sun. The X-ray source directly associated with the flare was partially occulted by the photosphere from the view of the ICE instrument. The occultation height above the solar limb was approximately 1.6 x 10(5) km, a height much larger than that observed in previous stereoscopic measurements. The occultation height for the GOES soft X-ray (0.5-8 angstrom) monitor, which also observed the flare, was approximately 2.1 x 10(5) km. The flare was in full view of the 100 keV-2 MeV gamma-ray burst detector on the PVO spacecraft which was located at that time approximately 16-degrees behind the west limb of the Sun. The X-ray sources observed by the ICE and GOES instruments are identified as the unocculted coronal parts of the primary X-ray source associated with the flare. A comparison of the occulted and unocculted photon spectra shows the following: (1) The sources of the impulsive hard X-ray (greater than or similar to 25 keV) and impulsive soft X-ray (2-5 keV) emissions in this flare extended to coronal altitudes greater than or similar to 2 x 10(5) km above the photosphere. (2) At approximately 100 keV, the ratio of the coronal source brightness to the total source brightness was approximately 10(-3) during the impulsive phase and approximately 10(-2) during the gradual hard X-ray burst. (3). During the impulsive phase, the low energy cutoff of the nonthermal electron spectrum seemed to be less than or similar to 5 keV, indicating that the total energy carried by these electrons was much larger than that normally estimated on the basis of most solar flare models. (4) The sources of the gradual hard X-ray burst and gradual soft X-ray burst were almost completely occulted, indicating that the bright parts of these sources were located at heights < 2 x 10(5) km above the photosphere. (5) During the impulsive phase, the average rate of injection of electrons > 5 keV was approximately 6 x 10(36) electrons s-1, the total number injected being approximately 10(39). The rate of energy injection and the total injected energy were approximately 10(29) ergs s-1 and approximately 10(31) ergs, respectively. (6) The volume of the impulsive hard X-ray source in the corona is estimated to be greater than or similar to 10(30) CM3 with an average density of less than or similar to 10(9) ions cm-3, indicating a large diffuse hard X-ray source in the corona. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KANE, SR (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720, USA. NR 45 TC 40 Z9 40 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 MAY 10 PY 1992 VL 390 IS 2 BP 687 EP 702 DI 10.1086/171320 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HR232 UT WOS:A1992HR23200040 ER PT J AU HARRISON, TM WENJI, C LELOUP, PH RYERSON, FJ TAPPONNIER, P AF HARRISON, TM WENJI, C LELOUP, PH RYERSON, FJ TAPPONNIER, P TI AN EARLY MIOCENE TRANSITION IN DEFORMATION REGIME WITHIN THE RED RIVER FAULT ZONE, YUNNAN, AND ITS SIGNIFICANCE FOR INDO-ASIAN TECTONICS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID CONTINENTAL COLLISION; SOUTHERN TIBET; K-FELDSPAR; HIMALAYA; AGE; MONAZITE; UPLIFT; TEMPERATURE; CONSTRAINTS; EVOLUTION AB Recent work has tended to support the view that lateral extrusion of Indochina along the Red River fault zone was a significant factor in accommodating the convergence of India with Asia. To better understand the nature and timing of this feature, Ar-40/Ar-39 age spectrum analyses were undertaken on minerals from the Ailao Shan/Red River metamorphic belt in southern Yunnan, China. Interpreted using diffusion domain theory, these results yield thermal histories in the temperature range 550-150-degrees-C. Discontinuities in cooling rates observed from these results suggest a transition in deformation style in the shear zone during the early Miocene. At least in the vicinity of our samples, left-lateral, strike-slip ductile deformation appears to have ceased by about 20 Ma. The mylonitic gneisses in the shear zone were subsequently obliquely unroofed, probably due to a component of normal faulting along the eastern edge of the shear zone causing a brief (locally < 1 m.y.) but rapid (> 100-degrees-C/m.y.) cooling episode. This transition may have resulted from a component of northeast-southwest extension attributable to greater clockwise rotation of Indochina relative to South China after approximately 20 Ma than that consistent with pure strike-slip along the fault. K-Ar ages on clay minerals from gouge within the normal faults bounding the Ailao Shan and Diancang Shan yield a range of ages between 20 and 185 Ma but show a significant clustering at 20-25 Ma. These results suggest that early Miocene movement on a precursor to the Range Front normal fault in the Ailao Shan caused oblique unroofing of the shear zone. This early Miocene event corresponds in time with a transition from low to very high denudation rates throughout the Himalaya and southern Tibet. This coincidence may reflect that once left-lateral strike-slip motion on the Red River fault zone slowed or was terminated, accommodation of much of the continued northward convergence of India occurred on the Main Central Thrust resulting in rapid uplift in the Tethyan Himalaya and Gangdese belt. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. INST PHYS GLOBE,TECTON MECAN LITHOSPHERE LAB,F-75252 PARIS 05,FRANCE. RP HARRISON, TM (reprint author), UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,3806 GEOL BLDG,LOS ANGELES,CA 90024, USA. RI Tapponnier, .Paul/B-7033-2011; Leloup, Philippe/A-6053-2012; Harrison, Timothy/E-7443-2012 OI Tapponnier, .Paul/0000-0002-7135-1962; Leloup, Philippe/0000-0001-6090-8772; NR 52 TC 123 Z9 152 U1 2 U2 18 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 MAY 10 PY 1992 VL 97 IS B5 BP 7159 EP 7182 DI 10.1029/92JB00109 PG 24 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HT848 UT WOS:A1992HT84800037 ER PT J AU ODONNELL, JM MCCLOUD, BJ MORRIS, CL MCCLELLAND, JB RUSNAK, B THIESSEN, HA LANGENBRUNNER, JL AF ODONNELL, JM MCCLOUD, BJ MORRIS, CL MCCLELLAND, JB RUSNAK, B THIESSEN, HA LANGENBRUNNER, JL TI TEST OF SUPERCONDUCTING RADIOFREQUENCY CAVITY BOMBARDED BY PROTONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A beam of 2 x 10(10) protons/s was focused onto a small area on the high-field iris of a superconducting cavity operating at the resonance frequency. The input, reflected, and stored power were monitored. The cavity remained in steady state during this test. We conclude that such superconducting cavities will remain viable in the high-proton-flux environments proposed in the design of a superconducting accelerator for pions (PILAC). C1 UNIV MINNESOTA,DEPT PHYS & ASTRON,MINNEAPOLIS,MN 55455. RP ODONNELL, JM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 10 PY 1992 VL 314 IS 3 BP 409 EP 410 DI 10.1016/0168-9002(92)90231-R PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HW685 UT WOS:A1992HW68500002 ER PT J AU ALIMONTI, G BUTLER, J CAVALETTI, WR DANGELO, P DICORATO, M INZANI, P MALVEZZI, S MENASCE, D MORONI, L PEDRINI, D RAGUSA, F SALA, S VITTONE, M AF ALIMONTI, G BUTLER, J CAVALETTI, WR DANGELO, P DICORATO, M INZANI, P MALVEZZI, S MENASCE, D MORONI, L PEDRINI, D RAGUSA, F SALA, S VITTONE, M TI A MOMENTUM TAGGING SYSTEM FOR THE WIDE BAND E+/E- BEAM AT FNAL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A system to measure the particle momentum of the very high intensity wide band electrons and positrons beam FNAL) has been realized. It consists of five large area silicon microstrip detectors, assembled in a symmetric two lever arm configuration, measuring the particle bend angles across the last pair of beam dipoles. Each silicon plane, 300-mu-m thickness, consists of 256 microstrips with 300-mu-m pitch and it is exposed to a rate of about 10(6) particles CM-2 S-1. Nowadays no other kind of detector could operate in such a high intensity beam with such a fine granularity requirement. The system is based on local data pipelining at the TEVATRON radiofrequency (53 MHz) and it is currently used in the heavy quarks photoproduction experiment E687 at FERMILAB, with a 2.2% resolution at 350 GeV. Technical construction details, performances of the system (efficiencies, momentum resolution and rate capabilities) are presented. C1 IST NAZL FIS NUCL,SEZ MILANO,I-20133 MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. RP ALIMONTI, G (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Menasce, Dario Livio/A-2168-2016 OI Menasce, Dario Livio/0000-0002-9918-1686 NR 3 TC 2 Z9 2 U1 1 U2 2 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 MAY 10 PY 1992 VL 314 IS 3 BP 411 EP 416 DI 10.1016/0168-9002(92)90232-S PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HW685 UT WOS:A1992HW68500003 ER PT J AU NICHOLSON, WL HANLEN, RC AF NICHOLSON, WL HANLEN, RC TI COUNT RATE ESTIMATION FOR 1ST-COUNT, TIME-BINNING LOGIC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB When abundance estimation is performed using a first-count, time-binning logic, a random dead-time complicates the estimation. Here, three count rate estimates are considered as estimates of the true count rate, a naive estimate, a dead-time-adjusted estimate and the maximum-likelihood estimate for the count rate. The maximum-likelihood estimate is seen to be a good estimate over a broad range of time-bin length and count rate. Bias is minimal and variance estimation straightforward as long as at least 100 time bins are unoccupied. RP NICHOLSON, WL (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 10 PY 1992 VL 314 IS 3 BP 461 EP 464 DI 10.1016/0168-9002(92)90238-Y PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HW685 UT WOS:A1992HW68500009 ER PT J AU GREENWOOD, RC HELMER, RG LEE, MA PUTNAM, MH OATES, MA STRUTTMANN, DA WATTS, KD AF GREENWOOD, RC HELMER, RG LEE, MA PUTNAM, MH OATES, MA STRUTTMANN, DA WATTS, KD TI TOTAL ABSORPTION GAMMA-RAY SPECTROMETER FOR MEASUREMENT OF BETA-DECAY INTENSITY DISTRIBUTIONS FOR FISSION-PRODUCT RADIONUCLIDES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID GROSS THEORY; NUCLEI; PANDEMONIUM AB A total absorption gamma-ray spectrometer (TAGS), based on a 25.4 cm diameter x 30.5 cm long NaI(Tl) well detector, has been developed at the INEL on-line isotope separator facility. A Si detector in the well of the NaI(Tl) detector allows one to collect beta-particle-gated coincidence spectra as well as singles spectra. With this system, measurements of the total absorption spectra have been made for a number of fission product nuclei. The analysis of the measured spectra is based on response functions for single gamma-rays that are computed with a Monte Carlo code. Routines have been written to use these response functions to simulate the response to a cascade of several gamma-rays and by extension to a whole decay scheme. The bremsstrahlung from a ground-state beta-branch can also be simulated. The quality of the simulation is demonstrated for test spectra of CS-137, Na-24, Co-60, and Ag-110m. As examples of the operation of this system, the measurements and analyses of the beta-decay feeding distributions are described for the decay of Ba-141, Cs-139 and CS-140. RP GREENWOOD, RC (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 55 TC 34 Z9 34 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 10 PY 1992 VL 314 IS 3 BP 514 EP 540 DI 10.1016/0168-9002(92)90243-W PG 27 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HW685 UT WOS:A1992HW68500014 ER PT J AU SHANI, G AF SHANI, G TI DEVELOPMENT OF HE-3 SOLID-STATE DETECTORS EPITHERMAL NEUTRON SPECTROMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SILICON AB A neutron spectrometer was developed for measuring the neutron energy in the range from 1-300 keV. Its fabrication was based on the He-3(n, p)H-3 reaction, with two Si solid state detectors used for measuring the energy of the two charged particles. The sum of the energies of the two particles is the neutron energy E(n) plus the reaction Q-value (764 keV). The FWHM detector resolution is almost-equal-to 3%. The detector efficiency, almost-equal-to 3% for thermal neutrons, is proportional to 1/square-root E (i.e., to the detection reaction cross section). Cooling improves the resolution. To avoid obscuring of the low keV energy range by thermal neutrons, the detector was covered with a 1 mm layer of Cd. Background due to neutron interaction with the Si detector, and with the detector construction materials and gamma rays, was removed by repeating the foreground measurement with no He-3 in the detector. Neutron spectra were measured both with a moderated Cf-252 source and with an epithermal beam at the Brookhaven Medical Research Reactor (BMRR). Results were in good agreement with Monte Carlo calculations using the MCNP code. C1 BEN GURION UNIV NEGEV,DAVIDE & IRENE SALA CHAIR NUCL ENGN,IL-84105 BEER SHEVA,ISRAEL. RP SHANI, G (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 9 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 MAY 10 PY 1992 VL 314 IS 3 BP 553 EP 560 DI 10.1016/0168-9002(92)90247-2 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HW685 UT WOS:A1992HW68500018 ER PT J AU JAHAN, MS COX, C ERMER, DR JONES, DW COOKE, DW AF JAHAN, MS COX, C ERMER, DR JONES, DW COOKE, DW TI THERMALLY STIMULATED OPTICAL SCINTILLATIONS IN PREHEATED PLASTIC SCINTILLATORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter AB PVT-based plastic scintillators, irrespective of their radiation history, are found to exhibit thermally stimulated optical scintillations in the temperature interval 40-80-degrees-C following a preheat to 200-degrees-C or above and cooling to RT. Maximum scintillation activity occurs near 65-degrees-C, which is the glass transition temperature T(g) of the scintillators. Comparing our results with the literature data of similar work it is suggested that pyroelectricity is the mechanism producing these scintillations. They occur due to electrical breakdown of air caused by depolarization of polarized dipoles in the crystalline moiety and detrapping of the trapped charges in the crystal-amorphous interfaces of the material, which were formed by preheating. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP JAHAN, MS (reprint author), MEMPHIS STATE UNIV,DEPT PHYS,MEMPHIS,TN 38152, USA. NR 11 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 MAY 10 PY 1992 VL 314 IS 3 BP 617 EP 619 DI 10.1016/0168-9002(92)90257-5 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HW685 UT WOS:A1992HW68500028 ER PT J AU KWEI, GH OTT, KC PETERSON, EJ AF KWEI, GH OTT, KC PETERSON, EJ TI NEUTRON POWDER DIFFRACTION STUDY OF CU-SITE PREFERENCE OF LI DOPANTS IN YBA2(CU1-XLIX)3O6+DELTA SO PHYSICA C LA English DT Article ID SUBSTITUTION; YBA2CU3O7; SUPERCONDUCTORS; COPPER AB We report structural refinements for three Li-doped samples of the YBa2Cu3O6+delta superconductor, with 1.90% to 6.5% of the Cu replaced by Li, using neutron powder diffraction data. The superconducting transition temperature falls dramatically with doping level, falling to almost-equal-to 60 K at 1.90% Li, to less than 10 K, if at all, at 5.3% and 6.5% Li. In contrast, the structure changes slowly with increasing dopant levels, and remains orthorhombic for all samples. The oxygen stoichiometry decreases slowly from delta almost-equal-to 0.97 for an undoped sample to 0.82 as the Li content is increased to 6.5%, roughly a decrease of one O2- for every two Li1+ introduced, so as to maintain an approximately constant hole concentration. At low doping levels, the Li shows a strong preference for the chain Cu (1) sites; but at higher levels, this preference shifts to the plane Cu (2) sites. This behavior suggests that the solubility of Li in the chain sites is only about 5%, and that increasing the dopant level above this amount then forces the excess Li into the plane sites. The preferential doping of Li, first into the chain sites and then into the plane sites, provides a unique opportunity to study the effect of hole doping into the CuO2 planes, the role played by the Cu (1)-O(1) charge reservoir, and the O(4) ions that couple it to the planes. The observed changes in T(c) with doping are discussed in this context. RP KWEI, GH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 12 Z9 12 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 10 PY 1992 VL 194 IS 3-4 BP 307 EP 320 PG 14 WC Physics, Applied SC Physics GA HV980 UT WOS:A1992HV98000009 ER PT J AU ARENDT, RH GARBAUSKAS, MF MEYER, CA ROTELLA, FJ JORGENSEN, JD HITTERMAN, RL AF ARENDT, RH GARBAUSKAS, MF MEYER, CA ROTELLA, FJ JORGENSEN, JD HITTERMAN, RL TI THERMAL-EXPANSION MEASUREMENTS USING NEUTRON-DIFFRACTION OF (BI, PB)2CA2SR2CU3OX SO PHYSICA C LA English DT Article AB The high temperature superconductor (Bi, Pb)2Ca2Sr2Cu3Ox, Bi-(2223), will likely be used in the form of metal sheathed tapes of the oxide, in which the crystals of the material are aligned relative to the surface of the tape. In order to properly engineer these composite structures, a detailed knowledge of the physical properties of the components is required, one parameter being the anisotropic thermal expansion of the superconducting oxide. The temperature dependence of the lattice parameters was determined using neutron powder diffraction and the results presented in terms of the thermal expansion of the material in these directions. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV INTENSE PULSED NEUTRON SOURSE,ARGONNE,IL 60439. RP ARENDT, RH (reprint author), GE,CORP RES & DEV,SCHENECTADY,NY 12301, USA. NR 16 TC 17 Z9 17 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 10 PY 1992 VL 194 IS 3-4 BP 397 EP 402 DI 10.1016/S0921-4534(05)80020-6 PG 6 WC Physics, Applied SC Physics GA HV980 UT WOS:A1992HV98000020 ER PT J AU SUN, YR THOMPSON, JR CHRISTEN, DK HOLTZBERG, F MARWICK, AD OSSANDON, JG AF SUN, YR THOMPSON, JR CHRISTEN, DK HOLTZBERG, F MARWICK, AD OSSANDON, JG TI THE TEMPERATURE-DEPENDENT AND FIELD-DEPENDENT ACTIVATION-ENERGY OF A PROTON IRRADIATED YBCO SINGLE-CRYSTAL SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; FLUX-CREEP; CURRENT-DENSITY; CRITICAL STATE; YBA2CU3O7-DELTA; MOTION AB We have investigated the separate temperature and field dependences of the activation energy U(T, H, J) for pinning of magnetic flux in a high-J(c), proton irradiated Y1Ba2Cu3O7-delta single crystal. The work achieves two objectives: (1) to clarify arguments concerning the "anomalous" rise of U with increasing temperature and (2) to resolve differences in magnitude of U found when comparing magnetic relaxation and resistivity results. The temperature and field dependences of U for fixed J were first obtained by extrapolating U(J) as observed in magnetic relaxation (flux creep) experiments to lower J. For fixed current density J, peaks in U were observed with respect to both temperature and magnetic field. For H > 2 T, U(H) varied as approximately H-alpha, with alpha depending on temperature and current. The attempt time, treated as a fitting parameter, lies near 10(-3) approximately 10(-2)s in most cases. The magnitude of U agrees well with values reported from resistivity studies on high-J(c) epitaxial films. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP SUN, YR (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 34 TC 16 Z9 16 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 10 PY 1992 VL 194 IS 3-4 BP 403 EP 410 DI 10.1016/S0921-4534(05)80021-8 PG 8 WC Physics, Applied SC Physics GA HV980 UT WOS:A1992HV98000021 ER PT J AU MAYO, MJ HAMMETTER, WF CARIM, AH AF MAYO, MJ HAMMETTER, WF CARIM, AH TI OXYGEN DESORPTION AND STRUCTURE IN CABALACU3OX SO PHYSICA C LA English DT Article ID TETRAGONAL SUPERCONDUCTORS LABACACU3O7-DELTA AB The thermodynamics and kinetics of oxygen desorption in the tetragonal superconductor CaBaLaCu3Ox are examined. Equilibrium oxygen contents are determined by thermogravimetric analysis (TGA) for temperatures from 50 to 900-degrees-C. The results demonstrate that CaBaLaCu3Ox (x less-than-or-equal-to 6.85) loses oxygen more slowly than YBa2Cu3Ox (x less-than-or-equal-to 7) in flowing O2 as the temperature is increased. The resistance to oxygen loss is linked to a higher enthalpy for oxygen desorption in CaBaLaCu3Ox of DELTA-H = 1.74 eV/atom O (compared to DELTA-H almost-equal-to 1.1 eV/atom O in YBa2Cu3Ox), as measured by differential scanning calorimetry (DSC). If the superconductor is sufficiently depleted of oxygen, the half-order reflections observed in transmission electron microscopy (TEM) diffraction patterns disappear. This result confirms that oxygen ordering is responsible for unit cell doubling. Finally, upon reducing CaBaLaCu3Ox completely - to metallic Cu and elemental oxides - a two step reduction reaction occurs. It appears that the oxidation states of Cu and Ba are first reduced; then this reaction is followed by the conversion of Ba(OH)2 to BaO. C1 SANDIA NATL LABS,DIV ELECTR CERAM,ALBUQUERQUE,NM 87185. RP MAYO, MJ (reprint author), PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIV PK,PA 16802, USA. 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 0921-4534 J9 PHYSICA C JI Physica C PD MAY 10 PY 1992 VL 194 IS 3-4 BP 435 EP 447 DI 10.1016/S0921-4534(05)80026-7 PG 13 WC Physics, Applied SC Physics GA HV980 UT WOS:A1992HV98000026 ER PT J AU LIPFERT, FW MORRIS, SC AF LIPFERT, FW MORRIS, SC TI AIR-POLLUTION AND MORTALITY SO SCIENCE LA English DT Letter RP LIPFERT, FW (reprint author), ASSOC UNIV INC,BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 8 PY 1992 VL 256 IS 5058 BP 722 EP 722 DI 10.1126/science.1589747 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HT235 UT WOS:A1992HT23500005 PM 1589747 ER PT J AU DYER, P AF DYER, P TI UV SPECTRUM AND PROPOSED ROLE OF DIETHYLBERYLLIUM IN A LI-7-BE-7 SOLAR NEUTRINO EXPERIMENT SO SCIENCE LA English DT Article ID ORGANOMETALLIC COMPOUNDS; REAL-TIME; PHOTOLYSIS; DEPOSITION AB Although measurement of the solar neutrino flux via the Li-7(nu(e),e-)Be-7 reaction was proposed many years ago, no experiment has been implemented since it has been difficult to identify a sensitive Be-7 detection technique. Here it is proposed that the Be-7 atom be incorporated into a volatile molecule, placed in a buffer-gas-filled cell, and then extracted by photodissociation; after excitation by a tunable laser, bursts of photons would be detected. The absorption spectrum of the molecular candidate diethylberyllium has been measured between 186 and 270 nanometers in a spectrophotometer to determine the required photodissociation laser wavelength and intensity. RP DYER, P (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 16 TC 0 Z9 0 U1 1 U2 3 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 8 PY 1992 VL 256 IS 5058 BP 820 EP 822 DI 10.1126/science.256.5058.820 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HT235 UT WOS:A1992HT23500039 PM 17756445 ER PT J AU CASTEN, RF WOLF, A AF CASTEN, RF WOLF, A TI DISENTANGLING THE PROTON AND NEUTRON CONTRIBUTIONS TO COLLECTIVITY - EFFECTIVE CHARGES AS DERIVATIVES SO PHYSICS LETTERS B LA English DT Article ID INTERACTING-BOSON MODEL; STATES; NUCLEI; DEFORMATION AB A new interpretation of effective charges in valence nuclear models is proposed in which they are seen as proportional to derivatives of the "collectivity" with changes in proton or neutron number. Extraction of effective charges, e(nu) and e(pi), for all even-even nuclei with Z > 40 is accomplished using a set of analytic formulas for B(E2:2(1)+ --> 0(1)+) values. The results directly reflect the respective roles of protons and neutrons in promoting collectivity. C1 UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP CASTEN, RF (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 7 PY 1992 VL 281 IS 1-2 BP 1 EP 5 DI 10.1016/0370-2693(92)90263-4 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HV424 UT WOS:A1992HV42400001 ER PT J AU AHMAD, S BONNER, BE BUCHANAN, JA CHAN, CS CHIOU, CN CLEMENT, JM EISEMAN, SE ETKIN, A FOLEY, KJ HACKENBURG, RW HALLMAN, TJ KRAMER, MA LINDENBAUM, SJ LONGACRE, RS LOVE, WA MADANSKY, L MORRIS, TW MUTCHLER, GS PLATNER, ED SAULYS, AC AF AHMAD, S BONNER, BE BUCHANAN, JA CHAN, CS CHIOU, CN CLEMENT, JM EISEMAN, SE ETKIN, A FOLEY, KJ HACKENBURG, RW HALLMAN, TJ KRAMER, MA LINDENBAUM, SJ LONGACRE, RS LOVE, WA MADANSKY, L MORRIS, TW MUTCHLER, GS PLATNER, ED SAULYS, AC TI TRANSVERSE-MOMENTUM DISTRIBUTIONS OF PI FROM 14.6A GEV/C SILICON ION INTERACTIONS IN COPPER AND GOLD SO PHYSICS LETTERS B LA English DT Article AB A measurement of the transverse momentum spectrum of negatively charged tracks from AGS energy silicon ion collisions is presented. The spectrum has a different shape than that of nucleon-nucleon collisions at approximately the same energy. The transverse mass spectrum is well represented by a sum of two exponentials with different slopes and may be reasonably well accounted for by a model of pion production in interacting nuclear matter that includes resonance production and decay. C1 CUNY CITY COLL,NEW YORK,NY 10031. BROOKHAVEN NATL LAB,UPTON,NY 11973. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP AHMAD, S (reprint author), RICE UNIV,HOUSTON,TX 77251, USA. NR 9 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 7 PY 1992 VL 281 IS 1-2 BP 29 EP 32 DI 10.1016/0370-2693(92)90269-A PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HV424 UT WOS:A1992HV42400007 ER PT J AU FRABETTI, PL BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP BUTLER, JN DAVENPORT, F GAINES, I GARBINCIUS, PH GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H BIANCO, S FABBRI, FL SPALLONE, A ZALLO, A CULBERTSON, R JAROSS, G LINGEL, K SHELDON, PD WILSON, JR WISS, J ALIMONTI, G BELLINI, G DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CASTOLDI, C GOBBI, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD GARDNER, RW KENNEDY, CJ MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD ZANABRIA, ME ARENA, V RATTI, SP VITULO, P LOPEZ, A AF FRABETTI, PL BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP BUTLER, JN DAVENPORT, F GAINES, I GARBINCIUS, PH GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H BIANCO, S FABBRI, FL SPALLONE, A ZALLO, A CULBERTSON, R JAROSS, G LINGEL, K SHELDON, PD WILSON, JR WISS, J ALIMONTI, G BELLINI, G DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CASTOLDI, C GOBBI, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD GARDNER, RW KENNEDY, CJ MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD ZANABRIA, ME ARENA, V RATTI, SP VITULO, P LOPEZ, A TI MEASUREMENT OF THE DECAYS D0-]PI+PI+PI+PI-, D0-]K-K+ AND DS+-]PHI-PI+PI+PI- SO PHYSICS LETTERS B LA English DT Article AB We present measurements of the branching ratios for two Cabibbo suppressed decays of the D0 meson, D0 --> pi+pi+pi-pi- and D0 --> K-K+, and for the decay D(s)+ --> phi-pi+pi+pi-. The physics signals were extracted from a data sample consisting of 60 million triggers, collected by Fermilab Photoproduction Experiment E687 from December 1987 to February 1988. The relative branching ratios are measured lo be: GAMMA(D0 --> 4-pi)/GAMMA(D0 --> K3-pi) = 0.108 +/- 0.024 +/- 0.008, GAMMA(D0 --> KK)/GAMMA(D0 --> K-pi) = 0.138 +/- 0.027 +/- 0.010 and GAMMA(D(s) --> phi-3-pi)/GAMMA(D(s) --> phi-pi) = 0.58 +/- 0.20 +/- 0.10. C1 IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS NUCL,I-27100 PAVIA,ITALY. IST NAZL FIS NUCL,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 14 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 7 PY 1992 VL 281 IS 1-2 BP 167 EP 172 DI 10.1016/0370-2693(92)90292-C PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HV424 UT WOS:A1992HV42400030 ER PT J AU LOY, DA ASSINK, RA AF LOY, DA ASSINK, RA TI SYNTHESIS OF A C-60-P-XYLYLENE COPOLYMER SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CARBON; C-60 C1 SANDIA NATL LABS,DEPT PHYS CHEM & MECH PROPERTIES POLYMERS,ALBUQUERQUE,NM 87185. RP LOY, DA (reprint author), SANDIA NATL LABS,DEPT FUEL SCI,ALBUQUERQUE,NM 87185, USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 16 TC 145 Z9 146 U1 0 U2 6 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 MAY 6 PY 1992 VL 114 IS 10 BP 3977 EP 3978 DI 10.1021/ja00036a055 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HT801 UT WOS:A1992HT80100055 ER PT J AU CHIANG, Y KRESGE, AJ MORIMOTO, H WILLIAMS, PG AF CHIANG, Y KRESGE, AJ MORIMOTO, H WILLIAMS, PG TI KINETIC ISOTOPE EFFECTS ON THE HYDROXIDE ION CATALYZED ENOLIZATION OF ACETONE - RELATIONSHIP BETWEEN DEUTERIUM AND TRITIUM ISOTOPE EFFECTS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 UNIV TORONTO,DEPT CHEM,TORONTO M5S 1A1,ONTARIO,CANADA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,NATL TRITIUM LABELING FACIL,BERKELEY,CA 94720. NR 18 TC 16 Z9 16 U1 0 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 MAY 6 PY 1992 VL 114 IS 10 BP 3981 EP 3982 DI 10.1021/ja00036a058 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HT801 UT WOS:A1992HT80100058 ER PT J AU RASKO, J SOMORJAI, GA HEINEMANN, H AF RASKO, J SOMORJAI, GA HEINEMANN, H TI CATALYTIC LOW-TEMPERATURE OXYDEHYDROGENATION OF METHANE TO HIGHER HYDROCARBONS WITH VERY HIGH SELECTIVITY AT 8-12-PERCENT CONVERSION SO APPLIED CATALYSIS A-GENERAL LA English DT Article DE CALCIUM NICKEL POTASSIUM; LOW-TEMPERATURE OXYDEHYDROGENATION; METHANE DEHYDROGENATION; SELECTIVITY (HIGHER HYDROCARBONS) ID CALCIUM-OXIDE CATALYSTS; DIMERIZATION; ETHYLENE; CARBON AB Oxydehydrogenative coupling of methane to higher hydrocarbons has been obtained with close to 100% selectivity at 600-degrees-C and atmospheric pressure in the presence of steam over a CaNiK oxide catalyst. The reaction resulting in higher hydrocarbons is catalytic. Some carbon dioxide is produced thermally. The reaction is slightly exothermic. An Arrhenius plot shows that methane oxidation to carbon dioxide predominates at temperatures above 600-degrees-C and oxydehydrogenation of methane is dominant at lower temperatures. Artifacts, such as carbonate formation on the catalyst, have been excluded. The importance of exact catalyst composition and activation and the effect of the composition of the feed are demonstrated. A mechanism of catalyst deactivation is proposed. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. NR 17 TC 22 Z9 22 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-860X J9 APPL CATAL A-GEN JI Appl. Catal. A-Gen. PD MAY 5 PY 1992 VL 84 IS 1 BP 57 EP 75 DI 10.1016/0926-860X(92)80339-E PG 19 WC Chemistry, Physical; Environmental Sciences SC Chemistry; Environmental Sciences & Ecology GA HW174 UT WOS:A1992HW17400005 ER PT J AU MILLER, M LIU, XM SNYDER, SW THURNAUER, MC BIGGINS, J AF MILLER, M LIU, XM SNYDER, SW THURNAUER, MC BIGGINS, J TI PHOTOSYNTHETIC ELECTRON-TRANSFER REACTIONS IN THE GREEN SULFUR BACTERIUM CHLOROBIUM-VIBRIOFORME - EVIDENCE FOR THE FUNCTIONAL INVOLVEMENT OF IRON-SULFUR REDOX CENTERS ON THE ACCEPTOR SIDE OF THE REACTION CENTER SO BIOCHEMISTRY LA English DT Article ID LIMICOLA F THIOSULFATOPHILUM; PRIMARY CHARGE SEPARATION; PROSTHECOCHLORIS-AESTUARII; PHOTOSYSTEM-I; CHLOROFLEXUS-AURANTIACUS; PROTEIN; SPECTROSCOPY; MEMBRANE; COMPLEX; PHOTOREDUCTION AB The green sulfur bacterium Chlorobium vibrioforme was cultured in the presence of ethylene to selectively inhibit the synthesis of the chlorosome antenna BChl d. Use of these cells as starting material simplified the isolation of a photoactive antenna-depleted membrane fraction without the use of high concentrations of detergents. The preparation had a BChl a/P840 of 50, and the spectral properties were similar to those of preparations isolated from cells grown with a normal complement of chlorosomes. The membrane preparation was active in NADP+ photoreduction. This indicated that the fraction contained reaction centers with complete electron-transfer sequences which were then characterized further by flash kinetic spectrophotometry and EPR. We confirmed that cytochrome c553 is the endogenous donor to P840+, and at room temperature we observed a recombination reaction between the reduced terminal acceptor and P840+ with a t1/2 = 7 ms. Oxidative degradation of iron-sulfur centers using low concentrations of chaotropic salts introduced a faster recombination reaction of t1/2 = 50-mu-s which was lost at higher concentrations of chaotrope, indicating the participation of another iron-sulfur redox center earlier than the terminal acceptor. Cluster insertion using ferric chloride and sodium sulfide in the presence of 2-mercaptoethanol restored both the 50-mu-s and 7-ms recombination reactions, allowing definitive assignments of these centers as iron-sulfur centers. Following the suggestion of Nitschke et al. [(1990) Biochemistry 29, 3834-3842], we associate these two kinetic phases to back-reactions between P840+ and iron-sulfur centers F(X) and F(A)F(B), respectively. The iron-sulfur cluster degradation and reconstitution protocols also led to inhibition and restoration of NADP+ photoreduction by the membrane preparation, providing unequivocal evidence for the function of the centers F(X) and F(A)F(B) in the physiological electron-transfer sequence on the acceptor side of the Chlorobium reaction center. At 77 K we observed a recombination reaction of t1/2 = 20 ms that we suggest occurs between F(X)- and P840+. Degradation of the iron-sulfur clusters resulted in replacement of the 20-ms phase with a faster reaction of t1/2 = 80-mu-s that was most likely a recombination between the early acceptor A1- and P840+ or decay of P-3(840). Analysis of the iron-sulfur centers in the preparation by EPR at cryogenic temperature supports the optical measurements. EPR signals originating from the terminal acceptor(s) were not observed following treatment of the membrane preparation by chaotropes, and a modified signal was restored following cluster reinsertion. The reinsertion of iron-sulfur clusters in the Chlorobium preparation did not require the addition of any polypeptides, and the inclusion of psaC and psaD gene products that are required for the reconstitution of photosystem 1 did not increase the extent of the Chlorobium reconstitution. Kinetic interactions between the redox centers are discussed with reference to the model of the Chlorobium reaction center proposed by Nitschke et al. [(1990) Biochemistry 29, 3834-3842]. C1 BROWN UNIV,BIOCHEM SECT,PROVIDENCE,RI 02912. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ODENSE UNIV,INST BIOCHEM,DK-5230 ODENSE,DENMARK. RI Snyder, Seth/C-4370-2008 OI Snyder, Seth/0000-0001-6232-1668 NR 45 TC 41 Z9 41 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 5 PY 1992 VL 31 IS 17 BP 4354 EP 4363 DI 10.1021/bi00132a028 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HR856 UT WOS:A1992HR85600028 PM 1314661 ER PT J AU CHEN, JB SU, YZ JACOBSON, RA ANGELICI, RJ AF CHEN, JB SU, YZ JACOBSON, RA ANGELICI, RJ TI HYDRIDE ADDITION TO AND REDUCTION OF CP-ASTERISK-IR(ETA-6-BT)2+ AND CP-ASTERISK-IR(ETA-6-DBT)2+, WHERE BT = BENZO[B]THIOPHENE AND DBT = DIBENZOTHIOPHENE SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID COORDINATED UNSATURATED-HYDROCARBONS; ELECTRON-TRANSFER REACTIONS; RAY CRYSTAL-STRUCTURE; NUCLEOPHILIC-ATTACK; BRIDGED COMPLEXES; METAL-COMPLEXES; CARBONYL; LIGANDS; RHODIUM; HYDRODESULFURIZATION AB The benzo[b]thiophene (BT) complexes Cp star Ir(eta-6-BTs)2+, where BTs is BT (1a), 2-MeBT (1b). 3-MeBT (1c) or 2,3-Me2BT (1d), react with H2Al(OCH2CH2OMe)2- to add two H- to the coordinated arene ring of the BTs to give the cyclohexadiene complexes Cp star Ir(eta-4-BTs.2H), 2a-d. The [GRAPHICS] dibenzothiophene complex Cp star Ir(eta-6-DBT)2+ (3) reacts similarly to give Cp star Ir(eta-4-DBT.2H) (4). Both of these reactions can be reversed by adding Ph3C+. Two-electron reductions of 1c and 3 give the eta-4-arene complexes Cp star Ir(eta-4-3-MeBT) (5) and Cp star Ir(eta-4-DBT) (6). Compounds 2c and 4 have been characterized by X-ray diffraction. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 30 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 5 PY 1992 VL 428 IS 3 BP 415 EP 429 PG 15 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HV251 UT WOS:A1992HV25100009 ER PT J AU KYRALA, GA FULTON, RD WAHLIN, EK JONES, LA SCHAPPERT, GT COBBLE, JA TAYLOR, AJ AF KYRALA, GA FULTON, RD WAHLIN, EK JONES, LA SCHAPPERT, GT COBBLE, JA TAYLOR, AJ TI X-RAY GENERATION BY HIGH IRRADIANCE SUBPICOSECOND LASERS SO APPLIED PHYSICS LETTERS LA English DT Article ID PLASMAS; PULSES; DENSITY; TARGETS; IONS AB We have studied the interaction of 290-fs, 308-nm laser pulses with aluminum targets at irradiances exceeding 5 X 10(18) W/cm2. The x-ray spectrum is dominated by the H- and He-like lines from aluminum, with the brightest lines radiating 0.8% of the incident laser light energy. This fraction is close to that measured at 50 times less irradiance, but occurs at a slightly higher ionization stage. The x rays are emitted from a region of subcritical electron density at 3-6 X 10(21) cm-3. The radiance of the 1.73-keV L(alpha) line is measured to be 4 x 10(12) W/cm2/sr. RP KYRALA, GA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,POB 1663,MS E526,LOS ALAMOS,NM 87545, USA. NR 26 TC 54 Z9 55 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 4 PY 1992 VL 60 IS 18 BP 2195 EP 2197 DI 10.1063/1.107077 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000007 ER PT J AU SPECHT, ED SPARKS, CJ MCHARGUE, CJ AF SPECHT, ED SPARKS, CJ MCHARGUE, CJ TI DETERMINATION OF RESIDUAL-STRESS IN CR-IMPLANTED AL2O3 BY GLANCING ANGLE X-RAY-DIFFRACTION SO APPLIED PHYSICS LETTERS LA English DT Article ID ION-IMPLANTATION; ROCKING CURVE; DISTRIBUTIONS; APPROXIMATION; SAPPHIRE; STRAIN AB We report x-ray diffraction measurements of residual stress in sapphire crystals implanted with Cr+ ions. Stress is determined by measuring both in-plane and out-of-plane lattice constants. Bragg peak positions are measured to determine average stress, while peak widths are measured to determine its variation. Using angles of incidence close to the critical angle for total external reflection of x rays, we compare measurements confined to within approximately 2.5 nm of the surface and measurements over the approximately 80 nm thickness of the implanted region. These x-ray residual stress determinations are consistent with those based on indentation crack length, but were less by a factor of 10 than reports based on cantilever bending. RP SPECHT, ED (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009 OI Specht, Eliot/0000-0002-3191-2163 NR 26 TC 18 Z9 18 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 4 PY 1992 VL 60 IS 18 BP 2216 EP 2218 DI 10.1063/1.107060 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000014 ER PT J AU FANG, Y DANYLUK, S GORETTA, KC CHEN, N RUNDE, M ROTHMAN, SJ ROUTBORT, JL AF FANG, Y DANYLUK, S GORETTA, KC CHEN, N RUNDE, M ROTHMAN, SJ ROUTBORT, JL TI TRACER DIFFUSION OF AG-110 IN BI2SR2CACU2OX SO APPLIED PHYSICS LETTERS LA English DT Article ID CU-O SUPERCONDUCTOR; AG; SYSTEM; TC AB Tracer diffusion of Ag-110 in dense polycrystalline Bi2Sr2CaCu2Ox has been measured at temperatures from 600 to 800-degrees-C at an oxygen pressure of 10(5) Pa, and in oxygen partial pressures from 10(3) to 10(5) Pa at 700-degrees-C. The diffusivity of Ag in Bi2Sr2CaCu2Ox is given by D = (8.9(-4.2)+7.9)exp[-(181.4 +/- 4.8 kJ/mol)/RT] cm2/s, and is not a sensitive function of oxygen partial pressure. C1 UNIV ILLINOIS,DEPT CIVIL ENGN MECH & MET,CHICAGO,IL 60680. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NORWEGIAN INST TECHNOL,NORWEGIAN ELECT POWER INST,N-7034 TRONDHEIM,NORWAY. RP FANG, Y (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 15 TC 12 Z9 12 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 MAY 4 PY 1992 VL 60 IS 18 BP 2291 EP 2293 DI 10.1063/1.107033 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000039 ER PT J AU THOMPSON, JR SUN, YR KERCHNER, HR CHRISTEN, DK SALES, BC CHAKOUMAKOS, BC MARWICK, AD CIVALE, L THOMSON, JO AF THOMPSON, JR SUN, YR KERCHNER, HR CHRISTEN, DK SALES, BC CHAKOUMAKOS, BC MARWICK, AD CIVALE, L THOMSON, JO TI ENHANCED CURRENT DENSITY-JC AND EXTENDED IRREVERSIBILITY IN SINGLE-CRYSTAL BI2SR2CA1CU2O8 VIA LINEAR DEFECTS FROM HEAVY-ION IRRADIATION SO APPLIED PHYSICS LETTERS LA English DT Article AB Large enhancements in the critical current density J(c) were produced in single crystals of the high-temperature superconductor Bi2Sr2Ca1Cu2O8 by irradiation with high energy Sn ions. In addition, the irreversibility line was moved to considerably higher magnetic fields. In contrast with analogous studies on Y1Ba2Cu3O7, there was little, if any, selective pinning when the magnetizing field was applied parallel to the linear, ion-damage-produced tracks. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP THOMPSON, JR (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Christen, David/A-9709-2008; Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 19 TC 160 Z9 161 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 MAY 4 PY 1992 VL 60 IS 18 BP 2306 EP 2308 DI 10.1063/1.107012 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000044 ER PT J AU BRINKER, CJ SMITH, DM DESHPANDE, R DAVIS, PM HIETALA, S FRYE, GC ASHLEY, CS ASSINK, RA AF BRINKER, CJ SMITH, DM DESHPANDE, R DAVIS, PM HIETALA, S FRYE, GC ASHLEY, CS ASSINK, RA TI SOL-GEL PROCESSING OF CONTROLLED PORE OXIDES SO CATALYSIS TODAY LA English DT Article AB In sol-gel processing the pore structure of the dry gel (xerogel) or film is a consequence ot the sequential (or overlapping) gelation, aging, and drying stages. This paper demonstrates how the surface area, pore volume, and pore size are influenced by such physical and chemical factors as the size, structure and composition of the inorganic polymers, the magnitude of the capillary pressure, conditions of aging, and choice of pore fluid. C1 UNIV NEW MEXICO,CTR MICRO ENGINEERED CERAM,ALBUQUERQUE,NM 87131. RP BRINKER, CJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 27 Z9 29 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD MAY 4 PY 1992 VL 14 IS 2 BP 155 EP 163 DI 10.1016/0920-5861(92)80019-J PG 9 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JD460 UT WOS:A1992JD46000004 ER PT J AU GLEMZA, R PARENT, YO WELSH, WA AF GLEMZA, R PARENT, YO WELSH, WA TI AMORPHOUS ALUMINUM PHOSPHATE GELS SO CATALYSIS TODAY LA English DT Article ID CATALYSTS AB Amorphous aluminum phosphate gels have been synthesized which have structures analogous to amorphous silica gels. Crystalline aluminum phosphates are known to have structures isomorphous with most SiO2 Structures and therefore the similarity of amorphous material was anticipated. In the present work, amorphous aluminum phosphate gels have been prepared with a P/Al atomic ratio of approximately 1 with higher pore volume and pore diameter than previously reported, making them more suitable for certain catalyst support and adsorbent applications. Maintenance of a P/Al atomic ratio of approximately 1 was done with the intention of synthesizing a uniform AlPO4 phase rather than a mixture of discrete AlPO4, Al2O3 and P2O5 regions. Surface areas ranging from 250-350 m2/g were routinely obtained in conjunction with pore volumes from 0.4-1.8 cc/g. Surface chemistry was studied by NMR and ESCA techniques. Uses of the amorphous aluminum phosphate gels as ethylene polymerization catalysts and adsorbents are described. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP GLEMZA, R (reprint author), WR GRACE & CO CONN,DAVISON CHEM DIV,7379 ROUTE 32,COLUMBIA,MD 21044, USA. NR 14 TC 13 Z9 13 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD MAY 4 PY 1992 VL 14 IS 2 BP 175 EP 188 DI 10.1016/0920-5861(92)80021-E PG 14 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JD460 UT WOS:A1992JD46000006 ER PT J AU ANTHONY, RG GONZALEZ, E PHILIP, CV DOSCH, RG AF ANTHONY, RG GONZALEZ, E PHILIP, CV DOSCH, RG TI SYNTHESIS AND CATALYTIC ACTIVITY WHEN USING A TYPE-2 TITANATE SO CATALYSIS TODAY LA English DT Article ID POLYOXO CATIONS; ALUMINUM AB The synthesis of Type 2 crystalline sodium aluminum titanate (T2CT) was optimized, and techniques for scale-up from 3 to 100 grams per batch were developed. On scaling to 100 g batches the surface area decreased from 207 to 160-170 m2/g, but all other properties such as X-Ray diffraction patterns, elemental composition, ion exchange capacity, and stability remained the same. Four sources of aluminum, aluminum nitrate, aluminum chloride, aluminum isopropoxide, and aluminum butoxide, were used in the synthesis, and no apparent change in the material occurs. The composition, ion exchange capacity, and effective diffusivity for hexane vapor measured at 22-degrees-C for the T2CT was determined to be Na0.47Al0.02TiO2.265, 4.4 meq/g, and 1.2*10(-11) m2/s, respectively. Calcination at 535-degrees-C resulted in a slight decrease in the d0-spacing from 1.0 to 0.9 nm, and formation of the crystalline phase, Na0.23TiO2. At 600-degrees-C the only crystalline phase remaining was Na0.23TiO2. When acid exchanged T2CT was used as a support for a sulfided NiMo catalysts, the activity for hydrogenation of pyrene was 1.22(g Mo)-1s-1 for particle size of -100 mesh. For two commercial catalysts, Shell 324 and Amocat 1C, the activities were 1.2 and 1.45 (g Mo)-1 s-1 for -200 mesh, respectively. Effective diffusivities of 6.5 * 10(-12) and 3.2 * 10(-11) m2/s for pyrene at 300-degrees-C were obtained for Shell 324 and Amocat 1C commercial catalysts, respectively. C1 SANDIA NATL LABS,DIV 6212,ALBUQUERQUE,NM 87185. RP ANTHONY, RG (reprint author), TEXAS A&M UNIV SYST,DEPT CHEM ENGN,KINET CATALYSIS & REACT ENGN LAB,MS 1322,COLLEGE STN,TX 77843, USA. NR 15 TC 5 Z9 5 U1 2 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD MAY 4 PY 1992 VL 14 IS 2 BP 253 EP 268 DI 10.1016/0920-5861(92)80027-K PG 16 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JD460 UT WOS:A1992JD46000012 ER PT J AU SMITH, DM DESHPANDE, R BRINKER, CJ EARL, WL EWING, B DAVIS, PJ AF SMITH, DM DESHPANDE, R BRINKER, CJ EARL, WL EWING, B DAVIS, PJ TI INSITU PORE STRUCTURE CHARACTERIZATION DURING SOL-GEL SYNTHESIS OF CONTROLLED POROSITY MATERIALS SO CATALYSIS TODAY LA English DT Article ID SPIN-LATTICE RELAXATION; NMR TECHNIQUE; DIFFUSION; SYSTEM; SIZE AB Using NMR relaxation measurements of pore fluid, the pore volume, surface area, and pore size distribution of wet materials may be measured in-situ. In this manner, changes in pore structure may be directly observed during various aging steps (i.e., temporal, thermal, solvent exchange, pH) of sol-gel derived porous solids. By combining these relaxation measurements with Nuclear Magnetic Resonance imaging (NMRI), the spatial variation of pore structure may be observed. In addition to how the surface area, porosity, and pore size distribution vary at different points within the sample, the change of sample physical dimensions during processing can be measured. This enables the study of catalyst-related problems such as "skin" effects and catalyst supports with spatially-varied structure in order to minimize mass transfer limitations. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SMITH, DM (reprint author), UNIV NEW MEXICO,NSF,CTR MICRO ENGINEERED CERAM,ALBUQUERQUE,NM 87131, USA. NR 21 TC 9 Z9 9 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD MAY 4 PY 1992 VL 14 IS 2 BP 293 EP 303 DI 10.1016/0920-5861(92)80030-Q PG 11 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JD460 UT WOS:A1992JD46000015 ER PT J AU MILLER, AJ NAGATANI, RM TIAO, GC NIU, XF REINSEL, GC WUEBBLES, D GRANT, K AF MILLER, AJ NAGATANI, RM TIAO, GC NIU, XF REINSEL, GC WUEBBLES, D GRANT, K TI COMPARISONS OF OBSERVED OZONE AND TEMPERATURE TRENDS IN THE LOWER STRATOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID APPROXIMATION AB One result of the Ozone Assessment [WMO, 1989] is that there is a significant negative ozone trend in the lower stratosphere and upper troposphere from 1970 through 1986. In this paper we examine the relationship of this trend in ozone to that of temperature in the same altitude region utilizing a 62 station set of rawinsonde data, and compare the results to the changes in temperature determined from a radiative equilibrium model calculation. The calculated and observed trends in lower stratospheric temperature indicate substantive agreement in shape and magnitude of the vertical profiles. C1 UNIV CHICAGO, GRAD SCH BUSINESS, CHICAGO, IL 60637 USA. UNIV WISCONSIN, GRAD SCH BUSINESS, MADISON, WI 53706 USA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP MILLER, AJ (reprint author), NATL WEATHER SERV, CTR CLIMATE ANAL, 5200 AUTH RD, WASHINGTON, DC 20233 USA. NR 15 TC 40 Z9 40 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAY 4 PY 1992 VL 19 IS 9 BP 929 EP 932 DI 10.1029/92GL00778 PG 4 WC Geosciences, Multidisciplinary SC Geology GA HT894 UT WOS:A1992HT89400022 ER PT J AU TILLEY, DR WELLER, HR HALE, GM AF TILLEY, DR WELLER, HR HALE, GM TI ENERGY-LEVELS OF LIGHT-NUCLEI A = 4 SO NUCLEAR PHYSICS A LA English DT Review ID PHASE-SHIFT ANALYSIS; CHARGE FORM-FACTOR; P-HE-4 ELASTIC-SCATTERING; P-ALPHA-SCATTERING; MODEL OPERATOR APPROACH; RESONATING-GROUP METHOD; CLOSED-SHELL NUCLEI; DIFFERENTIAL CROSS-SECTIONS; TENSOR ANALYZING POWERS; EQUIVALENT LOCAL POTENTIALS AB A compilation of information on A = 4 nuclei. Information relating to unbound states in H-4, He-4, and Li-4 is presented and discussed. No firm evidence for bound states of 4n, H-4, or Li-4 has been obtained. C1 TRIANGLE UNIV NUCL LAB, DURHAM, NC 27706 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 1616 TC 213 Z9 213 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 4 PY 1992 VL 541 IS 1 BP 1 EP 104 DI 10.1016/0375-9474(92)90635-W PG 104 WC Physics, Nuclear SC Physics GA JA610 UT WOS:A1992JA61000001 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, J GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LIMON, P LISS, TM LOCKYER, N LORETI, M LOW, E LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, J GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LIMON, P LISS, TM LOCKYER, N LORETI, M LOW, E LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI MEASUREMENT OF THE ISOLATED PROMPT PHOTON CROSS-SECTION IN (P)BAR-P COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present a measurement of the cross section for production of isolated prompt photons in ppBAR collisions at square-root s = 1.8 TeV. The cross section, measured as a function of transverse momentum (P(T)), agrees qualitatively with QCD calculations but has a steeper slope at low P(T). C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052 NR 9 TC 47 Z9 47 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 4 PY 1992 VL 68 IS 18 BP 2734 EP 2738 DI 10.1103/PhysRevLett.68.2734 PG 5 WC Physics, Multidisciplinary SC Physics GA HR183 UT WOS:A1992HR18300006 ER PT J AU JIANG, J BEAVIS, D CHU, SY FAI, G FUNG, SY JIANG, YZ KEANE, D LIU, QJ LIU, YM SHAO, Y VIENT, M WANG, S AF JIANG, J BEAVIS, D CHU, SY FAI, G FUNG, SY JIANG, YZ KEANE, D LIU, QJ LIU, YM SHAO, Y VIENT, M WANG, S TI HIGH-ORDER COLLECTIVE-FLOW CORRELATIONS IN HEAVY-ION COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID RELATIVISTIC NUCLEAR COLLISIONS; SHOCK-WAVES; MATTER; ENERGY; DISAPPEARANCE; MOTION; NE AB Using 4-pi-data from the Bevalac streamer chamber, we study azimuthal correlations for fragment pairs and higher-order multiplets. We point out that previous studies of sideward flow have not ruled out the possibility that the effect is dominated by a small number of correlated fragments in each event, as opposed to being a collective motion to which most or all fragments contribute. Based on a simulation, we infer that more than 70% of the forward-going fragments from collisions of Ar on Pb at 0.4A GeV carry a component of the collective motion. C1 UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. HARBIN INST TECHNOL,DEPT PHYS,HARBIN 150006,PEOPLES R CHINA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP JIANG, J (reprint author), KENT STATE UNIV,DEPT PHYS,KENT,OH 44242, USA. NR 32 TC 25 Z9 33 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 MAY 4 PY 1992 VL 68 IS 18 BP 2739 EP 2742 DI 10.1103/PhysRevLett.68.2739 PG 4 WC Physics, Multidisciplinary SC Physics GA HR183 UT WOS:A1992HR18300007 ER PT J AU PANG, Y SCHLAGEL, TJ KAHANA, SH AF PANG, Y SCHLAGEL, TJ KAHANA, SH TI CASCADE FOR RELATIVISTIC NUCLEUS COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUARK-GLUON PLASMA; HADRON-NUCLEUS; ENERGY-FLOW; MODEL; FRAGMENTATION; DISTRIBUTIONS; MULTIPLICITY; MATTER AB A relativistic hadronic cascade is used to simulate collisions of Si on Au at 14.6 GeV/c per nucleon. When proper account is taken of resonances produced in elemental hadron-hadron collisions this cascade quantitatively describes most published E802 data from the BNL Alternating Gradient Synchrotron, including the problematic proton transverse mass distributions. No medium effects seem required to explain the apparent enhancement of strangeness production nor any other features of the data. RP PANG, Y (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 36 TC 155 Z9 158 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 MAY 4 PY 1992 VL 68 IS 18 BP 2743 EP 2746 DI 10.1103/PhysRevLett.68.2743 PG 4 WC Physics, Multidisciplinary SC Physics GA HR183 UT WOS:A1992HR18300008 ER PT J AU JOYCE, SA THOMAS, RC HOUSTON, JE MICHALSKE, TA CROOKS, RM AF JOYCE, SA THOMAS, RC HOUSTON, JE MICHALSKE, TA CROOKS, RM TI MECHANICAL RELAXATION OF ORGANIC MONOLAYER FILMS MEASURED BY FORCE MICROSCOPY SO PHYSICAL REVIEW LETTERS LA English DT Article ID NANOMECHANICAL PROPERTIES; SURFACE FORCES; GOLD AB Using the newly developed interfacial-force microscope, we present results from the first measurements of the mechanical relaxation of a Au supported, self-assembled monolayer film interacting with a microscopic tungsten tip. For a methyl-terminated n-alkanethiol film, we observe negligible adhesive film-tip interaction and complete passivation of tip-substrate bonding. The mechanical behavior of the film itself shows a time-dependent, elastic response. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. RP JOYCE, SA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Joyce, Stephen/Q-7804-2016 OI Joyce, Stephen/0000-0003-1330-7362 NR 17 TC 135 Z9 135 U1 1 U2 18 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 MAY 4 PY 1992 VL 68 IS 18 BP 2790 EP 2793 DI 10.1103/PhysRevLett.68.2790 PG 4 WC Physics, Multidisciplinary SC Physics GA HR183 UT WOS:A1992HR18300020 ER PT J AU WILLS, JM ERIKSSON, O SODERLIND, P BORING, AM AF WILLS, JM ERIKSSON, O SODERLIND, P BORING, AM TI TRENDS OF THE ELASTIC-CONSTANTS OF CUBIC TRANSITION-METALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; CRYSTAL-STRUCTURE; POTENTIALS; ALLOYS AB We show for the first time, using ab initio calculations, that the trend exhibited by the elastic constants in the transition metals can be simply understood. In particular, we show that the trend of the elastic constants of cubic transition metals is determined by the energy difference between the fcc and bcc structures of a given element, which in turn is determined by band filling. Our results suggest indirectly that the reason for the disagreement between calculated "experimental" data for crystal energy differences does not lie in the calculated results. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV UPPSALA,DEPT PHYS,S-75105 UPPSALA,SWEDEN. RP WILLS, JM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 28 TC 84 Z9 84 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 4 PY 1992 VL 68 IS 18 BP 2802 EP 2805 DI 10.1103/PhysRevLett.68.2802 PG 4 WC Physics, Multidisciplinary SC Physics GA HR183 UT WOS:A1992HR18300023 ER PT J AU PHILLIPS, R CHRZAN, DC AF PHILLIPS, R CHRZAN, DC TI KINETIC PHASE-DIAGRAM FOR CRYSTAL-GROWTH - A (1+1)-DIMENSIONAL MODEL - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter RP PHILLIPS, R (reprint author), SANDIA NATL LABS,DIV THEORET,LIVERMORE,CA 94551, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 4 PY 1992 VL 68 IS 18 BP 2855 EP 2855 DI 10.1103/PhysRevLett.68.2855 PG 1 WC Physics, Multidisciplinary SC Physics GA HR183 UT WOS:A1992HR18300037 ER PT J AU WOOTEN, EW MUELLER, KT PINES, A AF WOOTEN, EW MUELLER, KT PINES, A TI NEW ANGLES IN NUCLEAR-MAGNETIC-RESONANCE SAMPLE SPINNING SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID SOLID-STATE NMR; CHEMICAL-SHIFT-ANISOTROPY; HIGH-RESOLUTION NMR; ROTATING SOLIDS; DOUBLE-ROTOR; SPECTROSCOPY; PROTON; AXIS C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Mueller, Karl/A-3637-2010 NR 29 TC 43 Z9 43 U1 0 U2 4 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 MAY PY 1992 VL 25 IS 5 BP 209 EP 215 DI 10.1021/ar00017a001 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA HU248 UT WOS:A1992HU24800001 ER PT J AU ESPENSON, JH AF ESPENSON, JH TI CHEMISTRY OF ORGANOCHROMIUM(III) COMPLEXES SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID CHROMIUM-CARBON BOND; ELECTRON-TRANSFER REACTIONS; RAY CRYSTAL-STRUCTURES; 1-HYDROXY-1-METHYLETHYL RADICALS; AQUEOUS-SOLUTIONS; 2-HYDROXY-2-PROPYL RADICALS; PHOTOCHEMICAL GENERATION; ORGANOCOBALT COMPLEXES; METHYLMERCURY(II) IONS; OLEFIN POLYMERIZATION C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP ESPENSON, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 96 TC 48 Z9 48 U1 1 U2 5 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 MAY PY 1992 VL 25 IS 5 BP 222 EP 227 DI 10.1021/ar00017a003 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA HU248 UT WOS:A1992HU24800003 ER PT J AU LONG, TW AF LONG, TW TI SATELLITE ATTITUDE-CONTROL IN THE EQUIVALENT AXIS FRAME SO ACTA ASTRONAUTICA LA English DT Article AB An equivalent axis coordinate frame is found for the rest-to-rest reorientation maneuver of a satellite. This effectively transforms the nonlinear satellite control problem into a linear control problem. Within this frame, the satellite motion is a plane motion. Therefore, only one kinematic equation and one dynamic equation are needed. This approach is especially advantageous in the optimal control of the satellite attitude where all the iterative computation will use 2 x 2 matrices instead of 7 x 7 matrices, a two order of magnitude decrease in matrix operation. RP LONG, TW (reprint author), LAWRENCE LIVERMORE NATL LAB,L463,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0094-5765 J9 ACTA ASTRONAUT JI Acta Astronaut. PD MAY PY 1992 VL 26 IS 5 BP 299 EP 305 DI 10.1016/0094-5765(92)90075-T PG 7 WC Engineering, Aerospace SC Engineering GA JH491 UT WOS:A1992JH49100001 ER PT J AU ADLER, PH OLSON, GB STEVENS, MF GALLEGOS, GF AF ADLER, PH OLSON, GB STEVENS, MF GALLEGOS, GF TI ON THE CONSTITUTIVE RELATIONS FOR DELTA-]ALPHA AND ALPHA-]DELTA MARTENSITIC-TRANSFORMATION PLASTICITY IN PLUTONIUM ALLOYS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID DEFORMATION AB A constitutive model for transformation plasticity based on isothermal martensitic kinetics is applied to delta --> alpha and alpha --> delta transformation in Pu alloys. The model is in good agreement with available data for the delta --> alpha-transformation plasticity behavior of PuGa alloys in unixial compression as a function of composition, temperature and strain rate. Application to alpha --> delta-transformation in uniaxial tension and crack-tip stress states indicates that general transformation in uniaxial tension is precluded by premature brittle fracture of the alpha-phase, but localized transformation will occur at crack tips as supported by metallographic observations. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, LIVERMORE, CA 94550 USA. NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. RI Olson, Gregory/B-7529-2009 NR 30 TC 13 Z9 13 U1 1 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 MAY PY 1992 VL 40 IS 5 BP 1073 EP 1082 DI 10.1016/0956-7151(92)90085-S PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HP055 UT WOS:A1992HP05500021 ER PT J AU HECKER, SS AF HECKER, SS TI LEVERAGING THE FEDERAL RESEARCH-AND-DEVELOPMENT INVESTMENT FOR TECHNOLOGY PARTNERSHIPS SO ADVANCED MATERIALS & PROCESSES LA English DT Editorial Material RP HECKER, SS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD MAY PY 1992 VL 141 IS 5 BP 15 EP 15 PG 1 WC Materials Science, Multidisciplinary SC Materials Science GA HT821 UT WOS:A1992HT82100003 ER PT J AU WOLINSKY, SM KORBER, B WIKE, CM PARKS, W MUNOZ, H HUTTO, C AF WOLINSKY, SM KORBER, B WIKE, CM PARKS, W MUNOZ, H HUTTO, C TI HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 (HIV-1) SEQUENCE VARIATION BETWEEN MOTHER-INFANT TRANSMISSION PAIRS SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Meeting Abstract C1 NORTHWESTERN UNIV,CHICAGO,IL 60611. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NYU,NEW YORK,NY 10003. UNIV MIAMI,MIAMI,FL 33152. NR 0 TC 0 Z9 0 U1 0 U2 0 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 MAY PY 1992 VL 8 IS 5 BP 931 EP 931 PG 1 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JA513 UT WOS:A1992JA51300298 ER PT J AU LAYNE, SP MERGES, MJ DEMBO, M SPOUGE, JL NARA, PL AF LAYNE, SP MERGES, MJ DEMBO, M SPOUGE, JL NARA, PL TI RELATIONSHIPS BETWEEN ENVELOPE SHEDDING, CELL-DENSITY AND HUMORAL BLOCKING ACTIVITY SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NCI,FREDERICK,MD 21701. NATL LIB MED,BETHESDA,MD 20209. RI Dembo, Micah/C-2755-2013 NR 0 TC 0 Z9 0 U1 0 U2 2 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 MAY PY 1992 VL 8 IS 5 BP 941 EP 941 PG 1 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JA513 UT WOS:A1992JA51300335 ER PT J AU SPOUGE, JL NARA, PL LAYNE, SP AF SPOUGE, JL NARA, PL LAYNE, SP TI VACMAN - A PRACTICAL COMPUTER-PROGRAM FOR ANALYZING VIRAL INFECTIVITY ASSAYS AND VACCINE TRIALS SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Meeting Abstract C1 NATL LIB MED,BETHESDA,MD 20209. NCI,LTCB,FREDERICK,MD 21702. LOS ALAMOS NATL LAB,BIOPHYS GRP,LOS ALAMOS,NM 87544. NR 0 TC 0 Z9 0 U1 0 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 MAY PY 1992 VL 8 IS 5 BP 941 EP 941 PG 1 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JA513 UT WOS:A1992JA51300334 ER PT J AU HOWARTH, RB NORGAARD, RB AF HOWARTH, RB NORGAARD, RB TI ENVIRONMENTAL VALUATION UNDER SUSTAINABLE DEVELOPMENT SO AMERICAN ECONOMIC REVIEW LA English DT Article; Proceedings Paper CT 104TH ANNUAL MEETING OF THE AMERICAN ECONOMIC ASSOC CY JAN 03-05, 1992 CL NEW ORLEANS, LA SP AMER ECON ASSOC C1 UNIV CALIF BERKELEY,ENERGY & RESOURCES PROGRAM,BERKELEY,CA 94720. RP HOWARTH, RB (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. OI Howarth, Richard/0000-0003-3182-7345 NR 11 TC 81 Z9 83 U1 1 U2 15 PU AMER ECONOMIC ASSOC PI NASHVILLE PA 2014 BROADWAY, STE 305, NASHVILLE, TN 37203 SN 0002-8282 J9 AM ECON REV JI Am. Econ. Rev. PD MAY PY 1992 VL 82 IS 2 BP 473 EP 477 PG 5 WC Economics SC Business & Economics GA HW149 UT WOS:A1992HW14900082 ER PT J AU DLUGOSZ, L VENA, J BYERS, T SEVER, L BRACKEN, M MARSHALL, E AF DLUGOSZ, L VENA, J BYERS, T SEVER, L BRACKEN, M MARSHALL, E TI CONGENITAL-DEFECTS AND ELECTRIC BED HEATING IN NEW-YORK-STATE - A REGISTER-BASED CASE-CONTROL STUDY SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Article DE ABNORMALITIES; ELECTROMAGNETICS; NEURAL TUBE DEFECTS; PREGNANCY ID FREQUENCY MAGNETIC-FIELDS; VIDEO DISPLAY TERMINALS; NEURAL-TUBE DEFECTS; ELECTROMAGNETIC-FIELDS; CHILDHOOD-CANCER; BIRTH-DEFECTS; CLEFT-LIP; EXPOSURE; EPIDEMIOLOGY; PREGNANCY AB Exposure to 60-cycle electromagnetic fields has been hypothesized to be a cause of childhood cancer and congenital defects. Because electric bed heaters are a major source of variation in electromagnetic field exposure in the population, the authors conducted a case-control study in 1988-1989 to examine the relations between congenital defects and the use of electric blankets and heated waterbeds. Cases were identified by the New York State Congenital Malformations Registry as babies with cleft palate (n = 121), cleft lip with or without cleft palate (n = 197), born in 1983-1984, and anencephalus and spina bifida (n = 224), born in 1983-1986, all to upstate New York residents. Controls were selected at random from birth registrations individually matched to cases by maternal race, age, home county, month of last menses, and child's sex. Information on periconceptional electric blanket and heated waterbed use as well as known and suspected risk factors for defects was obtained from questionnaires mailed to the mothers. Matched odds ratio estimates and 95% confidence intervals (CIs) for electric blanket use relative to nonuse were 0.8 (95% CI 0.3-2.1) for cleft palate, 0.7 (95% CI 0.3-1.3) for cleft lip, and 0.9 (95% CI 0.5-1.6) for neural tube defects. The respective odds ratios for heated waterbed use were nearly identical to these. Adjustment for potential confounding factors (maternal education, vitamin use, smoking) and stratification by season of conception and bed heat control setting had no meaningful effect on odds ratios. These results suggest that 60-cycle fields do not cause neural tube and oral cleft defects. C1 SUNY BUFFALO, SCH MED, DEPT SOCIAL & PREVENT MED, BUFFALO, NY 14214 USA. CTR DIS CONTROL, CTR CHRON DIS PREVENT & HLTH PROMOT, DIV NUTR, ATLANTA, GA 30333 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NEW YORK STATE DEPT HLTH, BUR ENVIRONM EPIDEMIOL & OCCUPAT HLTH, ALBANY, NY 12201 USA. RP DLUGOSZ, L (reprint author), YALE UNIV, SCH MED, DEPT EPIDEMIOL & PUBL HLTH, 60 COLL ST, NEW HAVEN, CT 06510 USA. NR 60 TC 40 Z9 40 U1 0 U2 2 PU JOHNS HOPKINS UNIV SCHOOL HYGIENE PUB HEALTH PI BALTIMORE PA 111 MARKET PLACE, STE 840, BALTIMORE, MD 21202-6709 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD MAY 1 PY 1992 VL 135 IS 9 BP 1000 EP 1011 PG 12 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA HY092 UT WOS:A1992HY09200006 PM 1595686 ER PT J AU HAALAND, CM AF HAALAND, CM TI MINIMUM ENGINE SIZE FOR OPTIMUM AUTOMOBILE ACCELERATION SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB The theoretical minimum for engine power rating required to accelerate a vehicle of mass M to velocity V in time T is shown to result from acceleration at constant maximum power. Because actual conditions do not allow infinite starting acceleration, the power per unit mass to provide optimum feasible acceleration with minimum engine power rating is given by P(opt)/M = a(max)2 T(c), where a(max) is the maximum starting acceleration and T(c) is the crossover time from maximum acceleration to the curve of acceleration at constant maximum power. Comparison with analysis of performance data for 18 automobiles reveals that 17 achieve near-optimum power usage. RP HAALAND, CM (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 5 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 MAY PY 1992 VL 60 IS 5 BP 415 EP 422 DI 10.1119/1.16893 PG 8 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA HQ728 UT WOS:A1992HQ72800008 ER PT J AU VOLKOW, ND LEVY, A BRODIE, JD WOLF, AP CANCRO, R VANGELDER, P HENN, F AF VOLKOW, ND LEVY, A BRODIE, JD WOLF, AP CANCRO, R VANGELDER, P HENN, F TI LOW CEREBELLAR METABOLISM IN MEDICATED PATIENTS WITH CHRONIC-SCHIZOPHRENIA SO AMERICAN JOURNAL OF PSYCHIATRY LA English DT Article ID PSYCHIATRIC-DISORDERS; COMPUTED-TOMOGRAPHY; RAT-BRAIN; PATHOLOGY; ATROPHY; VENTRICLE; VERMIS AB Because of the frequent association of cerebellar structural defects with schizophrenia, the authors reanalyzed the metabolic brain images of patients with chronic schizophrenia to assess if they had abnormalities in cerebellar metabolism. They used carbon-11-2-deoxyglucose and positron emission tomography to study 18 medicated patients with chronic schizophrenia and 12 normal comparison subjects. Patients with schizophrenia showed significantly lower absolute and relative metabolism in the cerebellum than normal subjects. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NYU,DEPT PSYCHIAT,NEW YORK,NY 10003. 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. NR 22 TC 61 Z9 61 U1 0 U2 0 PU AMER PSYCHIATRIC ASSOCIATION PI WASHINGTON PA 1400 K ST NW, WASHINGTON, DC 20005 SN 0002-953X J9 AM J PSYCHIAT JI Am. J. Psychiat. PD MAY PY 1992 VL 149 IS 5 BP 686 EP 688 PG 3 WC Psychiatry SC Psychiatry GA HR721 UT WOS:A1992HR72100018 PM 1575261 ER PT J AU WRIGHT, T AF WRIGHT, T TI LAGRANGE IDENTITY REVEALS CORRELATION-COEFFICIENT AND STRAIGHT-LINE CONNECTION SO AMERICAN STATISTICIAN LA English DT Article DE LINEAR RELATION; PEARSON CORRELATION COEFFICIENT ID SCHWARZ INEQUALITY AB Using an elementary but important identity, this article presents a simple proof that Pearson's correlation coefficient r is always between - 1 and 1 and that all points (x(i), y(i)) for i = 1, . . . , n fall on a straight line iff r2 = 1. The presentation is suitable for a wide audience with minimal background. RP WRIGHT, T (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831, USA. NR 8 TC 3 Z9 3 U1 1 U2 2 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0003-1305 J9 AM STAT JI Am. Stat. PD MAY PY 1992 VL 46 IS 2 BP 106 EP 107 DI 10.2307/2684174 PG 2 WC Statistics & Probability SC Mathematics GA HR034 UT WOS:A1992HR03400006 ER PT J AU BAUMANN, EW AF BAUMANN, EW TI COLORIMETRIC DETERMINATION OF IRON(II) AND IRON(III) IN GLASS SO ANALYST LA English DT Article DE GLASS ANALYSIS; IRON(II) DETERMINATION; IRON(III) DETERMINATION; IRON IN GLASS; FERROZINE ID NUCLEAR WASTE; ROCK AB A simple method to determine relative amounts of Fe(II) and Fe(III) was developed for the analysis of glass containing nuclear waste. The pulverized glass sample was dissolved in a sulfuric acid-hydrofluoric acid mixture with ammonium metavanadate added to preserve the Fe(II) content. The V(V)-V(IV) couple, which is strongly acid-dependent, caused the Fe(II) to be oxidized to Fe(III) in the highly acidic dissolution and then to be regenerated when the solution was adjusted to pH 5 for formation of the magenta Fe(II)-Ferrozine complex. Boric acid was added to complex the fluoride and permit regeneration of Fe(II), otherwise Fe(III) would be stabilized as a fluoride complex. The Fe(II) content was determined from the absorbance at 562 nm, and total Fe was determined from the absorbance of the same solution after ascorbic acid had been added to reduce Fe(III) to Fe(II). The relative standard deviation was 5%, and the range was 3-97% for Fe(II) in total Fe. The method was validated by analysing a glass frit spiked with ammonium iron(II) sulfate and/or ammonium iron(III) sulfate solutions. The method is applicable to glasses (or minerals) that contain more than about 5% total Fe. RP BAUMANN, EW (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 13 TC 18 Z9 19 U1 2 U2 9 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0003-2654 J9 ANALYST JI Analyst PD MAY PY 1992 VL 117 IS 5 BP 913 EP 916 DI 10.1039/an9921700913 PG 4 WC Chemistry, Analytical SC Chemistry GA HU711 UT WOS:A1992HU71100016 ER PT J AU BOND, AM FELDBERG, SW GREENHILL, HB MAHON, PJ COLTON, R WHYTE, T AF BOND, AM FELDBERG, SW GREENHILL, HB MAHON, PJ COLTON, R WHYTE, T TI INSTRUMENTAL, THEORETICAL, AND EXPERIMENTAL ASPECTS OF DETERMINING THERMODYNAMIC AND KINETIC-PARAMETERS FROM STEADY-STATE AND NON-STEADY-STATE CYCLIC VOLTAMMETRY AT MICROELECTRODES IN HIGH-RESISTANCE SOLVENTS - APPLICATION TO THE FAC/MER-[CR(CO)3(ETA-3-PH2PCH2CH2P(PH)CH2CH2PPH2)](+/0) SQUARE REACTION SCHEME IN DICHLOROMETHANE SO ANALYTICAL CHEMISTRY LA English DT Article ID MICROVOLTAMMETRIC ELECTRODES; SUPPORTING ELECTROLYTE; MICRODISC ELECTRODES; SWEEP VOLTAMMETRY; DIFFUSION; ULTRAMICROELECTRODES; ELECTROCHEMISTRY; DROP AB Instrumental, experimental and theoretical approaches required to quantify the thermodynamic and kinetic aspects of the square reaction scheme relating the fac+/0 and mer+/0 redox couples in the high-resistance solvent dichloromethane, at microelectrodes, under both steady-state and fast scan rate (transient) conditions, are presented. fac+, mer+, fac0, and mer0 represent the facial and meridional isomers of Cr(CO)3(eta-3-Ph2PCH2CH2P(Ph)CH2CH2PPh2) in the oxidized 17 electron (fac+, mer+) and reduced 18 electron (fac0, mer0) configurations, respectively. A computationally efficient simulation method based on the DuFort-Frankel algorithm is readily applied to microelectrodes and enables simulations to be undertaken for both steady-state and transient voltammetry at electrodes of microdisk geometry. The minimal ohmic drop present under steady-state conditions enables a limited set of parameters to be calculated for the square scheme. However, data relevant to species generated as a product of electron transfer have to be determined from the transient voltammetry at fast scans rates. For the latter experiments, a newly designed electrochemical cell was developed along with relevant electronic circuitry to minimize the background current and uncompensated resistance. The cell contains two matched working microelectrodes (one in the test solution and one in the separated electrolyte solution) and a common quasi-reference electrode which passes through both compartments of the cell. It is concluded thal a judicious choice of steady-state and transient techniques, such as those described in this work, are necessary to characterize complex reaction schemes in high-resistance solvents. In the example presented in this paper good agreement between both regions of the microelectrode experiments is obtained, although uncompensated resistance still appears to influence the fast scan rate data and this is Indicated by an apparent faster rate of electron transfer obtained via the use of steady-state voltammetry. C1 DEAKIN UNIV,DEPT CHEM & ANALYT SCI,GEELONG,VIC 3217,AUSTRALIA. UNIV MELBOURNE,SCH CHEM,INORGAN CHEM SECT,PARKVILLE,VIC 3052,AUSTRALIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Mahon, Peter/H-1967-2013 NR 46 TC 26 Z9 26 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 1 PY 1992 VL 64 IS 9 BP 1014 EP 1021 DI 10.1021/ac00033a010 PG 8 WC Chemistry, Analytical SC Chemistry GA HR209 UT WOS:A1992HR20900011 ER PT J AU DAVIES, KTR AF DAVIES, KTR TI DYSON EQUATIONS FOR NUCLEON PION DELTA INTERACTIONS - TOWARD A SELF-CONSISTENT SOLUTION IN NUCLEAR-MATTER SO ANNALS OF PHYSICS LA English DT Article ID HARTREE-FOCK CALCULATIONS; COMPLEX-PLANE METHODS; HIGHLY OSCILLATORY INTEGRALS; LOCAL-DENSITY APPROXIMATION; INTERMEDIATE ENERGY; SKYRMES INTERACTION; SPHERICAL NUCLEI; SCATTERING; PHYSICS; FIELDS RP DAVIES, KTR (reprint author), OAK RIDGE NATL LAB,DIV PHYS,CTR COMPUTAT INTENS PHYS,OAK RIDGE,TN 37831, USA. NR 75 TC 5 Z9 5 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD MAY 1 PY 1992 VL 215 IS 2 BP 386 EP 456 DI 10.1016/0003-4916(92)90117-5 PG 71 WC Physics, Multidisciplinary SC Physics GA HU112 UT WOS:A1992HU11200006 ER PT J AU MOHAGHEGHI, A TUCKER, M GROHMANN, K WYMAN, C AF MOHAGHEGHI, A TUCKER, M GROHMANN, K WYMAN, C TI HIGH SOLIDS SIMULTANEOUS SACCHARIFICATION AND FERMENTATION OF PRETREATED WHEAT STRAW TO ETHANOL SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article DE ETHANOL; FERMENTATION; WHEAT STRAW AB Wheat straw was pretreated with dilute (0.5%) sulfuric acid at 140-degrees-C for 1 h. Pretreated straw solids were washed with deionized water to neutrality and then stored frozen at -20-degrees-C. The approximate composition of the pretreated straw solids was 64% cellulose, 33% lignin, and 2% xylan. The cellulose in the pretreated wheat straw solids was converted to ethanol in batch simultaneous saccharification and fermentation experiments at 37-degrees-C using cellulase enzyme from Trichoderma reesei (Genencor 150 L) with or without supplementation with beta-glucosidase from Aspergillus niger (Novozyme 188) to produce glucose sugar and the yeast Saccharomyces cerevisiae to ferment the glucose into ethanol. The initial cellulose concentrations were adjusted to 7.5, 10, 12.5, 15, 17.5, and 20% (w/w). Since wheat straw particles do not form slurries at these concentrations and cannot be mixed with conventional impeller mixers used in laboratory fermenters, a simple rotary fermenter was designed and fabricated for these experiments. The results of the simultaneous saccharification and fermentation (SSF) experiments indicate that the cellulose in pretreated wheat straw can be efficiently fermented into ethanol for up to a 15% cellulose concentration (24.4% straw concentration). Above this concentration, the cells lose their viability apparently because of ethanol inhibition. The maximum ethanol concentration achieved of 57 g/L with 20.2% straw concentration (12.5% cellulose) yielded the highest sugar productivity of 1.27 g/Kg.h ethanol productivity of 0.62 g/Kg.h along with a combined ethanol and sugar yield of 70%. RP MOHAGHEGHI, A (reprint author), SOLAR ENERGY RES INST,DIV FUELS & CHEM RES & ENGN,BIOTECHNOL RES BRANCH,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 16 TC 80 Z9 84 U1 0 U2 11 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD MAY PY 1992 VL 33 IS 2 BP 67 EP 81 DI 10.1007/BF02950778 PG 15 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA JH360 UT WOS:A1992JH36000001 ER PT J AU THOMPSON, CP LEAF, GK VANROSENDALE, J AF THOMPSON, CP LEAF, GK VANROSENDALE, J TI A DYNAMICALLY ADAPTIVE MULTIGRID ALGORITHM FOR THE INCOMPRESSIBLE NAVIER-STOKES EQUATIONS - VALIDATION AND MODEL PROBLEMS SO APPLIED NUMERICAL MATHEMATICS LA English DT Article ID FLOWS AB We describe an algorithm for the solution of the laminar, incompressible Navier-Stokes equations. The basic algorithm is a multigrid method based on a robust, box-based smoothing step. Its most important feature is the incorporation of automatic, dynamic mesh refinement. Using an approximation to the local truncation error to control the refinement, we use a form of domain decomposition to introduce patches of finer grid wherever they are needed to ensure an accurate solution. This refinement strategy is completely local: regions that satisfy our tolerance are unmodified, except when they must be refined to maintain reasonable mesh ratios. This locality has the important consequence that boundary layers and other regions of sharp transition do not "steal" mesh points from surrounding regions of smooth flow, in contrast to moving mesh strategies where such "stealing" is inevitable. Our algorithm supports generalized simple domains, that is, any domain defined by horizontal and vertical lines. This generality is a natural consequence of our domain decomposition approach. We base our program on a standard staggered-grid formulation of the Navier-Stokes equations for robustness and efficiency. To ensure discrete mass conservation, we have introduced special grid transfer operators at grid interfaces in the multigrid algorithm. While these operators complicate the algorithm somewhat, our approach results in exact mass conservation and rapid convergence. In this paper, we present results for three model problems: the driven cavity, a backward-facing step, and a sudden expansion/contraction. Our approach obtains convergence rates that are independent of grid size and that compare favorably with other multigrid algorithms. We also compare the accuracy of our results with other benchmark results. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23665. RP THOMPSON, CP (reprint author), IBM CORP,BERGEN SCI CTR,THORMOHLENSGATE 55,N-5008 BERGEN,NORWAY. OI Thompson, Christopher/0000-0003-1939-6749 NR 18 TC 3 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 J9 APPL NUMER MATH JI Appl. Numer. Math. PD MAY PY 1992 VL 9 IS 6 BP 511 EP 532 DI 10.1016/0168-9274(92)90005-X PG 22 WC Mathematics, Applied SC Mathematics GA HQ512 UT WOS:A1992HQ51200005 ER PT J AU MIRZADEH, S RICE, DE KNAPP, FF AF MIRZADEH, S RICE, DE KNAPP, FF TI CARRIER-FREE IR-194 FROM AN OS-194/IR-194 GENERATOR - A NEW CANDIDATE FOR RADIOIMMUNOTHERAPY SO APPLIED RADIATION AND ISOTOPES LA English DT Note ID REACTOR PRODUCTION; OSMIUM-191; SYSTEM RP MIRZADEH, S (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,NUCL MED GRP,OAK RIDGE,TN 37831, USA. NR 19 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 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD MAY PY 1992 VL 43 IS 5 BP 689 EP 692 PG 4 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HQ047 UT WOS:A1992HQ04700019 ER PT J AU PATSCHEIDER, J MEBRAHTU, T COCKE, DL WRIGHT, RB NAUGLE, DG AF PATSCHEIDER, J MEBRAHTU, T COCKE, DL WRIGHT, RB NAUGLE, DG TI SURFACE STUDIES OF THE OXIDATION BEHAVIOR OF AL-STABILIZED TI-CU ALLOYS SO APPLIED SURFACE SCIENCE LA English DT Article ID OXIDE OVERLAYERS; FILMS; DIFFUSION; METALS; PASSIVATION; MECHANISM; ATOMS; GOLD; XPS AB The surface reactivity of amorphous (Ti0.5Cu0.5)0.0Al0.1 alloys has been probed using thermal oxidation and plasma oxidation studied with XPS and Auger depth profiling techniques. The aluminum concentration at the surface of the initial air-passivated sample was greatly enhanced relative to the bulk alloy composition while that of copper was reduced substantially. Thermal oxidation at temperatures above 400-degrees-C at 5 or 500 mTorr oxygen pressure increased the surface composition of titanium while reducing that of aluminum and completely eliminating surface copper. In contrast, the surface metal composition produced during plasma oxidation at temperatures between 200 and 500-degrees-C with 30 mTorr oxygen partial pressure approximated more closely that of the bulk alloy. In the plasma oxidation only the highest oxidation state corresponding to CuO is present at temperatures below 400-degrees-C. An observed shift in the 2p binding energy of Ti4+ suggests crystallization of the amorphous TiO2 surface layer at 200-300-degrees-C during thermal oxidation, but this crystallization was found to be hindered by plasma oxidation. The results are discussed in terms of their importance to catalysis and corrosion. C1 LAMAR UNIV,DEPT CHEM,BEAUMONT,TX 77843. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. TEXAS A&M UNIV SYST,DEPT PHYS,COLLEGE STN,TX 77843. NR 34 TC 2 Z9 2 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1992 VL 59 IS 1 BP 69 EP 78 DI 10.1016/0169-4332(92)90170-3 PG 10 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA HW731 UT WOS:A1992HW73100009 ER PT J AU NITSCHMANN, WH PACKER, L AF NITSCHMANN, WH PACKER, L TI NMR-STUDIES ON NA+ TRANSPORT IN SYNECHOCOCCUS PCC-6311 SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID WATER CYANOBACTERIUM SYNECHOCOCCUS-6311; ANACYSTIS-NIDULANS; PLASMA-MEMBRANE; ADAPTATION; SALINITY C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,MEMBRANE BIOENERGET GRP,251 LSA,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. NR 26 TC 24 Z9 25 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD MAY 1 PY 1992 VL 294 IS 2 BP 347 EP 352 DI 10.1016/0003-9861(92)90694-R PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HN472 UT WOS:A1992HN47200003 PM 1314538 ER PT J AU KURKISUONIO, H LIANG, E AF KURKISUONIO, H LIANG, E TI RELATION OF REDSHIFT SURVEYS TO MATTER DISTRIBUTION IN SPHERICALLY SYMMETRICAL DUST UNIVERSES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, DISTANCES AND REDSHIFTS; INTERGALACTIC MEDIUM; LARGE-SCALE STRUCTURE OF UNIVERSE; SURVEYS ID SMALL-SCALE ANISOTROPY; GALAXIES; LIMITS AB Redshift surveys are commonly used to map the distribution of matter in space. We consider the relation of the observed distribution in redshift space to the actual spacetime and its matter distribution in the spherically symmetric (Tolman-Bondi) dust model. Density inhomogeneities may be either curvature radius inhomogeneities or bang time inhomogeneities or some combination of these. In the pure curvature radius case the inhomogeneity appears stronger in the redshift space, whereas in a pure bang time case an observed overdensity corresponds to an actual underdensity of a larger amplitude. C1 RICE UNIV,DEPT SPACE PHYS & ASTRON,HOUSTON,TX 77251. RP KURKISUONIO, H (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Kurki-Suonio, Hannu/B-8502-2016 OI Kurki-Suonio, Hannu/0000-0002-4618-3063 NR 19 TC 7 Z9 7 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 MAY 1 PY 1992 VL 390 IS 1 BP 5 EP 16 DI 10.1086/171254 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HP595 UT WOS:A1992HP59500002 ER PT J AU LINK, B EPSTEIN, RI BAYM, G AF LINK, B EPSTEIN, RI BAYM, G TI POSTGLITCH BEHAVIOR OF THE CRAB PULSAR - EVIDENCE FOR EXTERNAL TORQUE VARIATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DENSE MATTER; HYDRODYNAMICS; PULSARS, INDIVIDUAL, CRAB; STARS, NEUTRON ID INTERNAL TEMPERATURE; NEUTRON STARS; VORTEX CREEP AB We show that the persistent offset in the spin-down rate of the Crab pulsar following the 1975 glitch is difficult to explain by the usually assumed dynamic coupling between the crust and the superfluid interior. One explanation of the observed behavior is an increase in the external torque caused by a rearrangement of the stellar magnetic field. C1 UNIV ILLINOIS,LOOMIS LAB PHYS,URBANA,IL 61801. RP LINK, B (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MS-D436,LOS ALAMOS,NM 87545, USA. NR 12 TC 28 Z9 28 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 MAY 1 PY 1992 VL 390 IS 1 BP L21 EP L22 DI 10.1086/186362 PN 2 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HP596 UT WOS:A1992HP59600006 ER PT J AU HELFAND, DJ ZOONEMATKERMANI, S BECKER, RH WHITE, RL AF HELFAND, DJ ZOONEMATKERMANI, S BECKER, RH WHITE, RL TI COMPACT RADIO-SOURCES NEAR THE GALACTIC PLANE SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE H-II REGIONS; PLANETARY NEBULAE; GENERAL; RADIO CONTINUUM; GALAXIES; SURVEYS ID H-II REGIONS; NEBULAE; CATALOG; GHZ; SKY AB The results of our extension of the 20 cm Galactic plane survey reported by Zoonematkermani and coworkers to Galactic latitudes of +/- 1-degrees.8 over the central region of the Milky Way )(-1O-degrees less-than-or-equal-to 1 less-than-or-equal-to 40-degrees) are reported. We catalog 1457 new discrete radio sources down to flux densities of less than or similar to 5 mJy and are 95% complete at 20 mJy. A detailed comparison of all radio sources from our complete survey in this longitude range with the IRAS Point Source Catalog provides classification for 13% of the objects, including 159 compact H ii regions, and nearly 100 planetary nebulae over 70 of which are newly identified. We comment briefly on the identity of the remaining radio sources and on the importance of our 6 cm survey, currently underway, in defining the radio source population of the Galaxy. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. SUNY STONY BROOK,DEPT EARTH & SPACE SCI,ASTRON PROGRAM,STONY BROOK,NY 11794. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP HELFAND, DJ (reprint author), COLUMBIA UNIV,COLUMBIA ASTROPHYS LAB,NEW YORK,NY 10027, USA. RI White, Richard/A-8143-2012 NR 25 TC 43 Z9 43 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD MAY PY 1992 VL 80 IS 1 BP 211 EP 255 DI 10.1086/191664 PG 45 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HR035 UT WOS:A1992HR03500005 ER PT J AU PENARRUBIA, L KIM, R GIOVANNONI, J KIM, SH FISCHER, RL AF PENARRUBIA, L KIM, R GIOVANNONI, J KIM, SH FISCHER, RL TI PRODUCTION OF THE SWEET PROTEIN MONELLIN IN TRANSGENIC PLANTS SO BIO-TECHNOLOGY LA English DT Article ID AGROBACTERIUM-TUMEFACIENS; THAUMATIN-I; EXPRESSION; GENE; TRANSFORMATION AB Monellin is a protein that elicits a flavor approximately 100,000 times sweeter than sugar on a molar basis. The protein exists naturally as a heterodimer, with its sweet flavor lost upon denaturation. A single-chain monellin gene, encoding both polypeptide chains linked by a hinge sequence, was placed under the control of constitutive and fruit-ripening specific promoters and transferred to lettuce and tomato. Expression of these genes in transgenic tomato and lettuce resulted in the accumulation of monellin protein in fruit and leaf, respectively, to significant levels. Production of monellin in transgenic fruits and vegetables represents an alternative strategy to enhance their flavor and quality. C1 LAWRENCE BERKELEY LAB,DEPT PLANT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 26 TC 29 Z9 42 U1 1 U2 5 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 0733-222X J9 BIO-TECHNOL JI Bio-Technology PD MAY PY 1992 VL 10 IS 5 BP 561 EP 564 DI 10.1038/nbt0592-561 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HV441 UT WOS:A1992HV44100027 ER PT J AU CARTER, CS ROBERTSON, LC CHADERJIAN, MR CELAYA, LJ NORDAHL, TE AF CARTER, CS ROBERTSON, LC CHADERJIAN, MR CELAYA, LJ NORDAHL, TE TI ATTENTIONAL ASYMMETRY IN SCHIZOPHRENIA - CONTROLLED AND AUTOMATIC PROCESSES SO BIOLOGICAL PSYCHIATRY LA English DT Article ID VISUAL-ATTENTION AB Two versions of Posner's covert orienting task were administered to 14 drug-free schizophrenic patients and 12 normal controls. In the schizophrenic subjects, automatic orienting to exogenous cues in the right visual field was impaired. However, this lateralizing general deficit was not present when the schizophrenics were able to direct attention effortfully in the second version of the task using endogenous cues. These findings support the hypothesis that there is a deficit in left hemispheric mechanisms mediating visual spatial attention in schizophrenia. However, when schizophrenics are given the opportunity to use an attentional strategy they are able to partially overcome this lateralized processing deficit. C1 UNIV CALIF DAVIS,SCH MED,DEPT PSYCHIAT,DAVIS,CA 95616. UNIV CALIF DAVIS,SCH MED,DEPT NEUROL,DAVIS,CA 95616. VET ADM MED CTR,MARTINEZ,CA 94553. LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. RI Nordahl, Thomas/J-7643-2013 OI Nordahl, Thomas/0000-0002-8627-0356 FU PHS HHS [M.H. 46990] NR 18 TC 58 Z9 58 U1 2 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0006-3223 J9 BIOL PSYCHIAT JI Biol. Psychiatry PD MAY 1 PY 1992 VL 31 IS 9 BP 909 EP 918 DI 10.1016/0006-3223(92)90117-I PG 10 WC Neurosciences; Psychiatry SC Neurosciences & Neurology; Psychiatry GA JD610 UT WOS:A1992JD61000006 PM 1637931 ER PT J AU ATLAS, RM SAYLER, G BURLAGE, RS BEJ, AK AF ATLAS, RM SAYLER, G BURLAGE, RS BEJ, AK TI MOLECULAR APPROACHES FOR ENVIRONMENTAL MONITORING OF MICROORGANISMS SO BIOTECHNIQUES LA English DT Review ID DNA COLONY HYBRIDIZATION; POLYMERASE CHAIN-REACTION; GENETICALLY ENGINEERED MICROORGANISMS; TOXIGENIC ESCHERICHIA-COLI; RIBOSOMAL-RNA SEQUENCES; GRAM-NEGATIVE BACTERIA; GENE PROBE METHODS; LISTERIA-MONOCYTOGENES; ENZYMATIC AMPLIFICATION; OLIGONUCLEOTIDE PROBES C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. UNIV ALABAMA,BIRMINGHAM,AL 35294. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP ATLAS, RM (reprint author), UNIV LOUISVILLE,DEPT BIOL,LOUISVILLE,KY 40292, USA. NR 119 TC 40 Z9 41 U1 0 U2 0 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD MAY PY 1992 VL 12 IS 5 BP 706 EP & PG 0 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HT696 UT WOS:A1992HT69600021 PM 1515138 ER PT J AU SPINDLER, DD WYMAN, CE GROHMANN, K PHILIPPIDIS, GP AF SPINDLER, DD WYMAN, CE GROHMANN, K PHILIPPIDIS, GP TI EVALUATION OF THE CELLOBIOSE-FERMENTING YEAST BRETTANOMYCES-CUSTERSII IN THE SIMULTANEOUS SACCHARIFICATION AND FERMENTATION OF CELLULOSE SO BIOTECHNOLOGY LETTERS LA English DT Article ID BETA-GLUCOSIDASE; ETHANOL; STRAINS AB Brettanomyces custersii (CBS 5512) was identified as a promising glucose- and cellobiose-fermenting yeast for the simultaneous saccharification and fermentation (SSF) of cellulose for ethanol production. In SSF studies with 75 g/L of cellulose, B. custersii produced 32 g/L of ethanol in just 3 days (75% of theoretical yield). This yield represents an increase of more than 16% over the yields of other fermentative yeasts and the time to achieve it is less than that with other organisms. In addition, the ethanol tolerance of B. custersii seems to be greater than that of other cellobiose-fermenting yeasts considered to date. Overall, the combination of higher yields, rates, and ethanol concentrations obtained with B. custersii improves the economics of ethanol production. C1 NATL RENEWABLE ENERGY LAB,DIV ALTERNAT FUELS,GOLDEN,CO 80401. NR 20 TC 44 Z9 45 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0141-5492 J9 BIOTECHNOL LETT JI Biotechnol. Lett. PD MAY PY 1992 VL 14 IS 5 BP 403 EP 407 DI 10.1007/BF01021255 PG 5 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HX122 UT WOS:A1992HX12200012 ER PT J AU SINHA, DN JOHNSTON, RG GRACE, WK LEMANSKI, CL AF SINHA, DN JOHNSTON, RG GRACE, WK LEMANSKI, CL TI ACOUSTIC RESONANCES IN CHICKEN EGGS SO BIOTECHNOLOGY PROGRESS LA English DT Article AB We report the first acoustical vibration studies on chicken eggs. Measurements of the acoustic resonances offer the potential of simple, noninvasive, and rapid characterization of eggs. The technique appears at least partially sensitive to yolk puncture, shell cracks, and the presence of Salmonella bacteria. There may be practical quality control applications. C1 LOS ALAMOS NATL LAB,BIOCHEM & BIOPHYS GRP,LOS ALAMOS,NM 87545. RP SINHA, DN (reprint author), LOS ALAMOS NATL LAB,PHYS CHEM PROC TECHNOL GRP,MS D429,LOS ALAMOS,NM 87545, USA. OI Sinha, Dipen/0000-0002-3606-7907 NR 9 TC 9 Z9 10 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 8756-7938 J9 BIOTECHNOL PROGR JI Biotechnol. Prog. PD MAY-JUN PY 1992 VL 8 IS 3 BP 240 EP 243 DI 10.1021/bp00015a600 PG 4 WC Biotechnology & Applied Microbiology; Food Science & Technology SC Biotechnology & Applied Microbiology; Food Science & Technology GA HZ243 UT WOS:A1992HZ24300011 ER PT J AU RICHES, MR ZHAO, JP WANG, WC TAO, SY AF RICHES, MR ZHAO, JP WANG, WC TAO, SY TI THE UNITED-STATES-DEPARTMENT-OF-ENERGY AND THE PEOPLES-REPUBLIC-OF-CHINA-ACADEMY-OF-SCIENCES JOINT RESEARCH ON THE GREENHOUSE-EFFECT - 1985-1991 RESEARCH PROGRESS SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The U.S. Department of Energy and the People's Republic of China's Academy of Sciences signed an agreement on 19 August 1987 to carry out a joint research program on the study of global warming due to enhanced greenhouse effect. The joint study is a first step toward providing opportunities for scientists in both countries to share climate information leading to a better understanding of the earth's climate system and to reliable regional climate prediction. The joint program has four tasks-analysis of general circulation models (GCMs), preparation and analysis of proxy and instrumental data, the study of the relationship between large- and regional-scale climates, and measuring and analyzing methane emissions from rice paddy fields in China. Significant progress is being made, and this paper summarizes the research progress since 1985, including two years of scientist-to-scientist collaboration. Overall, there are over 120 publications documenting project research. Highlights of the accomplishments are described and future collaborative work is outlined. C1 CHINESE ACAD SCI,INST ATMOSPHER PHYS,BEIJING,PEOPLES R CHINA. CHINESE ACAD SCI,BUR RESOURCES & ENVIRONM,BEIJING,PEOPLES R CHINA. SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12222. RP RICHES, MR (reprint author), US DOE,OFF HLTH & ENVIRONM RES,DIV ENVIRONM SCI,WASHINGTON,DC 20545, USA. NR 27 TC 7 Z9 7 U1 0 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD MAY PY 1992 VL 73 IS 5 BP 585 EP 594 DI 10.1175/1520-0477(1992)073<0585:TUDOEA>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HU545 UT WOS:A1992HU54500002 ER PT J AU EDWARDS, GS FRIEND, AL ONEILL, EG TOMLINSON, PT AF EDWARDS, GS FRIEND, AL ONEILL, EG TOMLINSON, PT TI SEASONAL PATTERNS OF BIOMASS ACCUMULATION AND CARBON ALLOCATION IN PINUS-TAEDA SEEDLINGS EXPOSED TO OZONE, ACIDIC PRECIPITATION, AND REDUCED SOIL MG SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID AIR-POLLUTION STRESS; NORWAY SPRUCE; GROWTH; PLANTS; PHOTOSYNTHESIS; ROOT; RAIN; POLLUTANTS; SHOOT AB Seasonal patterns of biomass accumulation and carbon allocation were determined for 1-year-old loblolly pine (Pinus taeda L.) seedlings grown in soil having either 15 or 35-mu-g Mg.g-1 and exposed to subambient, ambient, or twice ambient levels of ozone (O3) and simulated rainfall at pH 3.8 or 5.2 in open-top chambers. Seedlings were harvested during the 1988 dormancy period, immediately prior to bud break in 1989, during the first and third foliar growth flushes of 1989, and at the end of the 1989 growing season. At each harvest, biomass of individual seedling components was determined for all seedlings, and C-14 allocation among components was determined on a subset of seedlings. Seedlings exposed to twice ambient O3 exhibited a delay in fine-root production at the beginning of the 1989 growing season and reduced coarse-root biomass at the end of the 1989 growing season. Acidic precipitation and soil Mg treatments did not significantly affect biomass at any harvest date, nor were any treatment interactions observed. Biomass accumulation and carbon allocation were strongly affected by plant phenological stage, with maximum root allocation immediately prior to bud break and maximum shoot allocation at the end of the growing season. Seedlings exposed to twice ambient levels of O3 exhibited increased total respirational losses, decreased foliar retention, and slightly reduced export of initial C-14 label to stem and roots compared with seedlings exposed to subambient O3; however, these trends were not statistically significant. C1 MISSISSIPPI STATE UNIV,DEPT FORESTRY,MISSISSIPPI STATE,MS 39762. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. US FOREST SERV,N CENT FOREST EXPT STN,FORESTRY SCI LAB,RHINELANDER,WI 54501. RP EDWARDS, GS (reprint author), TENNESSEE VALLEY AUTHOR,COOPERAT FOREST STUDIES PROGRAM,TVA FORESTRY BLDG,NORRIS,TN 37828, USA. NR 31 TC 21 Z9 21 U1 1 U2 2 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD MAY PY 1992 VL 22 IS 5 BP 640 EP 646 DI 10.1139/x92-085 PG 7 WC Forestry SC Forestry GA HZ297 UT WOS:A1992HZ29700002 ER PT J AU GLENN, AW ROBERTO, FF WARD, TE AF GLENN, AW ROBERTO, FF WARD, TE TI TRANSFORMATION OF ACIDIPHILIUM BY ELECTROPORATION AND CONJUGATION SO CANADIAN JOURNAL OF MICROBIOLOGY LA English DT Article DE ACIDOPHILIC BACTERIA; ENDOGENOUS PLASMIDS; BROAD-HOST-RANGE PLASMIDS ID GRAM-NEGATIVE BACTERIA; HOST-RANGE PLASMIDS; THIOBACILLUS; CLONING; DNA AB Two techniques, electroporation and conjugation, have been used to introduce the RK2-based broad-host-range plasmids pRK415 and pLAFR3 into strains of the bacterial genus Acidiphilium. Using electroporation, cells were also transformed with a series of chimeric plasmids constructed by cloning cryptic Acidiphilium plasmids into the Escherichia coli vector pBR328. Various parameters affecting electroporation were investigaed. Transformation efficiency varied widely with different recipient strains. Growth at an elevated temperature (37-degrees-C) prior to electroporation increased transformation efficiency 10-fold compared with growth at 32-degrees-C. For three strains tested, optimum transformation efficiency was obtained with field strengths of 10-15 kV/cm. Transformation efficiency increased linearly with increasing DNA concentration up to 10-mu-g/mL. Transformation efficiencies in these experiments ranged up to 10(4) transformants/mu-g DNA. Mobilization of pRK415 and pLAFR3 from E. coli strain S17.1 into several Acidiphilium strains was achieved following incubation for 3 h on nutrient agar medium (pH 7.0). Conjugation frequencies in the range of 10(-5)-10(-9) per recipient cell were obtained. Conjugation frequency was also dependent on recipient strain. RP WARD, TE (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 31 TC 7 Z9 8 U1 1 U2 2 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4166 J9 CAN J MICROBIOL JI Can. J. Microbiol. PD MAY PY 1992 VL 38 IS 5 BP 387 EP 393 PG 7 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology GA JD669 UT WOS:A1992JD66900005 PM 1643582 ER PT J AU DAVIES, KTR WU, JS DAVIES, RW AF DAVIES, KTR WU, JS DAVIES, RW TI EVALUATION OF INTEGRALS USING GENERAL PARTIAL-FRACTION EXPANSIONS SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID DISPERSION-RELATIONS; MODEL AB The function [(x - t1)n1(x - t2)n2...(x - t(N)nN]-1 with N, n(i) greater-than-or-equal-to 1, is explicitly expanded in partial fractions. A general recursion relation is also derived. Of particular interest are the cases N = 2 and N = 3. For N = 2, three partial-fraction expansions are compared and a "Symmetrical" expansion is shown to be the most useful for evaluating various finite-limit and infinite-limit principal-value integrals. Such expressions are prototypes of integrals containing products of Green's functions, which are presently being studied in intermediate-energy nuclear physics . Also, a complex-contour evaluation provides another derivation of the symmetrical partial-fraction expansions. C1 GTE LABS INC,WALTHAM,MA 02254. RP DAVIES, KTR (reprint author), OAK RIDGE NATL LAB,CTR COMP INTENS PHYS,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD MAY PY 1992 VL 70 IS 5 BP 311 EP 318 PG 8 WC Physics, Multidisciplinary SC Physics GA JL858 UT WOS:A1992JL85800008 ER PT J AU BACUS, SS STANCOVSKI, I HUBERMAN, E CHIN, D HURWITZ, E MILLS, GB ULLRICH, A SELA, M YARDEN, Y AF BACUS, SS STANCOVSKI, I HUBERMAN, E CHIN, D HURWITZ, E MILLS, GB ULLRICH, A SELA, M YARDEN, Y TI TUMOR-INHIBITORY MONOCLONAL-ANTIBODIES TO THE HER-2/NEU RECEPTOR INDUCE DIFFERENTIATION OF HUMAN BREAST-CANCER CELLS SO CANCER RESEARCH LA English DT Article ID GROWTH-FACTOR RECEPTOR; NEU ONCOGENE PRODUCT; EGF RECEPTOR; PROTO-ONCOGENE; OVARIAN-CANCER; GENE; ADENOCARCINOMA; EXPRESSION; MICE; AMPLIFICATION AB The HER-2/neu protooncogene (also called erbB-2) encodes a tyrosine kinase receptor for a polypeptide growth-regulatory molecule. Amplification and overexpression of the gene have been frequently observed in human adenocarcinomas and correlated with poor prognosis. To explore the potential of antibody therapy directed at the HER-2/Neu receptor, we have raised a panel of murine monoclonal antibodies to the human protein, and tested their effect on the tumorigenic growth of HER-2/neu-transfected fibroblasts in athymic mice. We previously reported that the i.p. injected antibodies either inhibited or accelerated the tumorigenic growth of HER-2/neu transfectants in athymic mice. Here we report that these opposing effects were induced also by i.v. injected antibodies, they lasted over 7 weeks, and were probably mediated by distinct epitopes on the receptor molecule. To understand the cellular mechanisms underlying antibody-induced tumor inhibition, we tested the effect of the monoclonal antibodies on various cultured human breast cancer cells. Our analysis revealed that the tumor-inhibitory antibodies specifically induced phenotypic cellular differentiation that included growth arrest at late S or early G2 phase of the cell cycle, markedly altered cytoplasm and nuclear morphology, synthesis and secretion of milk components (casein and lipids), and translocation of the HER-2/Neu protein to cytoplasmic and perinuclear sites. The extent of cellular differentiation by various antibodies could be correlated with their tumor-inhibitory potential, whereas a tumor-stimulatory monoclonal antibody or control immunoglobulin were completely inactive with respect to cellular differentiation. Taken together, our in vivo and in vitro studies correlate the tumor inhibitory potential of monoclonal antibodies to HER-2/Neu with their capacity to induce cellular differentiation in vitro. This observation may hold promise for immunotherapy of cancers that express the HER-2/neu oncogene. C1 WEIZMANN INST SCI,DEPT CHEM IMMUNOL,IL-76100 REHOVOT,ISRAEL. ARGONNE NATL LAB,ARGONNE,IL 60439. TORONTO GEN HOSP,TORONTO M5G 1L7,ONTARIO,CANADA. CELL ANAL SYST INC,ELMHURST,IL 60126. INST BIOCHEM,W-8033 MARTINSRIED,GERMANY. RI YARDEN, YOSEF/K-1467-2012 FU NCI NIH HHS [CA50843, CA51712] NR 45 TC 105 Z9 105 U1 0 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAY 1 PY 1992 VL 52 IS 9 BP 2580 EP 2589 PG 10 WC Oncology SC Oncology GA HR290 UT WOS:A1992HR29000033 PM 1373672 ER PT J AU GRDINA, DJ KATAOKA, Y BASIC, I PERRIN, J AF GRDINA, DJ KATAOKA, Y BASIC, I PERRIN, J TI THE RADIOPROTECTOR WR-2721 REDUCES NEUTRON-INDUCED MUTATIONS AT THE HYPOXANTHINE GUANINE PHOSPHORIBOSYL TRANSFERASE LOCUS IN MOUSE SPLENOCYTES WHEN ADMINISTERED PRIOR TO OR FOLLOWING IRRADIATION SO CARCINOGENESIS LA English DT Article ID CO-60 GAMMA-RAY; V79 CELLS; S-2-(3-AMINOPROPYLAMINO)-ETHYLPHOSPHOROTHIOIC ACID; 2-<(AMINOPROPYL)AMINO> ETHANETHIOL; ESCHERICHIA-COLI; PROTECTION; LYMPHOCYTES; TOXICITY; WR1065; TRIAL AB An in vitro T-lymphocyte cloning technique has been applied to study the effects of JANUS fission-spectrum neutron irradiation and the radioprotector S-2-(3-aminopropylamino) ethylphosphorothioic acid (WR-2721) on the subsequent development of somatic mutations at the hypoxanthine-guanine phosphoribosyl transferase (hprt) locus in hybrid B6CF1 male mice. In control studies performed to establish an in vitro cloning technique, the mutant frequencies of splenic T-lymphocytes, as a result of exposure to a 100 cGy dose of neutrons, increased with time from a control level of 9 x 10(-7) to a maximum value of 1.7 x 10(-5) at 56 days following irradiation. Between 56 and 150 days after irradiation, mutant frequencies were observed to plateau and remain stable. All subsequent determinations were performed at 56 days following the experimental treatment of animals. WR-2721 at a dose of 400 mg/kg was effective in protecting against the induction of hprt mutants (i.e. a mutant frequency reduction factor, MFRF) following the largest dose of neutrons used (i.e. 150 cGy), whether it was administered i.p. 30 min before, 5 min after, 3 h after, or three times at 3, 24, and 48 h after, as evidenced by MFRFs of 6.0, 6.6, 4.8 and 5.8 respectively. The antimutagenic effectiveness of WR-2721 administered 30 min prior to irradiation was unaffected, even when the dose was reduced to 200 mg/kg, MFRF = 7.0; 100 mg/kg, MFRF = 3.8; and 50 mg/kg, MFRF = 8.9. These findings confirm our earlier report using the radioprotector N-(2-mercaptoethyl)-1,3-diaminopropane (WR-1065) under in vitro conditions, and demonstrate that these agents can be used as effective antimutagens even when they are administered up to 3 h following radiation exposure. C1 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. UNIV ZAGREB,YU-41001 ZAGREB,YUGOSLAVIA. RP GRDINA, DJ (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439, USA. FU NCI NIH HHS [CA-37435] NR 32 TC 60 Z9 63 U1 0 U2 0 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 MAY PY 1992 VL 13 IS 5 BP 811 EP 814 DI 10.1093/carcin/13.5.811 PG 4 WC Oncology SC Oncology GA HV458 UT WOS:A1992HV45800012 PM 1316813 ER PT J AU CARTA, G MAHAJAN, AJ COHEN, LM BYERS, CH AF CARTA, G MAHAJAN, AJ COHEN, LM BYERS, CH TI CHROMATOGRAPHY OF REVERSIBLY REACTING MIXTURES - MUTAROTATION EFFECTS IN SUGAR SEPARATIONS SO CHEMICAL ENGINEERING SCIENCE LA English DT Article ID ADSORPTIVE REACTORS; LIQUID-CHROMATOGRAPHY; PERFORMANCE AB A mathematical model is developed to describe the chromatographic behavior of a reversibly reacting mixture of two linearly adsorbed components. When the distribution coefficient between the fluid and the solid phases is different for the two components, the elution profiles are broadened to an extent that depends upon the rate of reaction. For low reaction rates, the two components behave independently and two separate peaks are obtained when an equilibrium mixture is injected. At intermediate reaction rates, the elution profiles are stretched between the characteristic elution times of the two components. Finally, at high reaction rates, the two components propagate through the column as an equilibrium mixture and two superimposed symmetrical peaks are obtained. The mathematical development is used in the analysis of experimental results for the chromatographic separation of glucose-fructose mixtures at different temperatures. Each component peak is broadened and distorted by the simultaneous occurrence of mutarotation, which results in the formation of differently sorbed tautomers for each sugar. The model developed allows a determination of equilibrium and rate constants for each tautomer and a successful prediction of the chromatographic behavior. C1 UNIV CAGLIARI,I-09100 CAGLIARI,ITALY. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RP CARTA, G (reprint author), UNIV VIRGINIA,CTR BIOPROC PROD DEV,DEPT CHEM ENGN,CHARLOTTESVILLE,VA 22903, USA. NR 34 TC 7 Z9 7 U1 2 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0009-2509 J9 CHEM ENG SCI JI Chem. Eng. Sci. PD MAY PY 1992 VL 47 IS 7 BP 1645 EP 1657 DI 10.1016/0009-2509(92)85012-Z PG 13 WC Engineering, Chemical SC Engineering GA HR696 UT WOS:A1992HR69600012 ER PT J AU BONANG, CC CAMERON, SM AF BONANG, CC CAMERON, SM TI RESONANCE HYPER-RAMAN AND RAMAN-SCATTERING FROM BENZENE AND FLUOROBENZENE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PHOTON EXCITATION SPECTRUM; AROMATIC AMINO-ACIDS; SELECTION-RULES; SPECTROSCOPY; 2-PHOTON; TRANSITION; ASSIGNMENT; PROFILES; VAPOR; PHASE AB The first resonance (1L(a) state) hyper-Raman spectra of benzene and fluorobenzene are reported. The benzene spectrum implies weak two-photon vibronic coupling between the 1L(a) and ground electronic states and is the first reported example of hyper-Raman C term scattering. The fluorobenzene spectrum is comprised of one-photon vibronically active fundamental modes, indicating strong two-photon dipole allowed electronic character. A corresponding resonance Raman spectrum confirms the primarily vibronic (one-photon) nature of the 1L(a) transition, although some dipole allowed activity is also evident. The results illustrate advantages of resonance hyper-Raman scattering over two-photon absorption techniques. C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. RP BONANG, CC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 24 TC 12 Z9 12 U1 4 U2 9 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 MAY 1 PY 1992 VL 192 IS 2-3 BP 303 EP 308 DI 10.1016/0009-2614(92)85470-U PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HT122 UT WOS:A1992HT12200028 ER PT J AU ISIED, SS OGAWA, MY WISHART, JF AF ISIED, SS OGAWA, MY WISHART, JF TI PEPTIDE-MEDIATED INTRAMOLECULAR ELECTRON-TRANSFER - LONG-RANGE DISTANCE DEPENDENCE SO CHEMICAL REVIEWS LA English DT Review ID PHOTOINDUCED CHARGE SEPARATION; RIGID NONCONJUGATED BRIDGES; HELICAL POLYPEPTIDE-CHAIN; CYTOCHROME-C DERIVATIVES; RADIATIVE RECOMBINATION; SOLVENT DEPENDENCE; TRANSFER KINETICS; TRANSFER RATES; PROTEINS; COMPLEXES C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP ISIED, SS (reprint author), RUTGERS STATE UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08904, USA. RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 85 TC 258 Z9 258 U1 0 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2665 J9 CHEM REV JI Chem. Rev. PD MAY PY 1992 VL 92 IS 3 BP 381 EP 394 DI 10.1021/cr00011a002 PG 14 WC Chemistry, Multidisciplinary SC Chemistry GA HV169 UT WOS:A1992HV16900003 ER PT J AU WASIELEWSKI, MR AF WASIELEWSKI, MR TI PHOTOINDUCED ELECTRON-TRANSFER IN SUPRAMOLECULAR SYSTEMS FOR ARTIFICIAL PHOTOSYNTHESIS SO CHEMICAL REVIEWS LA English DT Review ID PRIMARY CHARGE SEPARATION; DONOR-ACCEPTOR SYSTEMS; ION-PAIR STATE; RHODOPSEUDOMONAS-SPHAEROIDES R-26; POLARITY DEPENDENT PHOTOPHYSICS; CAROTENOPORPHYRIN-QUINONE TRIAD; SUBSTITUTED PORPHYRIN DIMERS; SYMMETRIC CHLOROPHYLL DIMER; BACTERIAL REACTION CENTERS; PHOTOSYSTEM-I PARTICLES RP WASIELEWSKI, MR (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 157 TC 2621 Z9 2633 U1 63 U2 524 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2665 J9 CHEM REV JI Chem. Rev. PD MAY PY 1992 VL 92 IS 3 BP 435 EP 461 DI 10.1021/cr00011a005 PG 27 WC Chemistry, Multidisciplinary SC Chemistry GA HV169 UT WOS:A1992HV16900006 ER PT J AU BURTIS, CA WATSON, JS AF BURTIS, CA WATSON, JS TI DESIGN AND EVALUATION OF AN ANTI-EVAPORATIVE COVER FOR USE WITH LIQUID CONTAINERS SO CLINICAL CHEMISTRY LA English DT Article DE SAMPLE HANDLING; VARIATION, SOURCE OF ID ABBOTT TDX REAGENTS; PREMATURE DEGRADATION; PERFORMANCE; SYSTEM AB We have designed an anti-evaporative cover for use with the sample and reagent cups and other liquid containers that are required in automated analytical systems. This cover, which is simple in design, consists of a baseplate and a cylindrical chimney. By increasing the height and decreasing the inner diameter of the chimney, evaporative losses can be reduced to < 0.1%/h; thus, aliquots of sample and reagents can be allowed to remain in their cups and containers for several hours before an analytical error due to evaporation will be measurable. We have also modified a model that we previously developed and validated to estimate evaporative losses from open sample cups, to allow us to predict evaporative losses from cups and containers fitted with the new type of cover. This model confirms that the magnitude of the evaporative loss is inversely proportional to the resistance provided by the headspace above the sample in the cup and by the space defined by the chimney of the cover. With chimney heights ranging from 12 to 36 mm and their inner diameters from 1 to 4 mm, > 70% of the resistance to evaporation is provided by the cover. C1 OAK RIDGE NATL LAB,DIV HLTH,OAK RIDGE,TN 37831. RP BURTIS, CA (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 26 TC 2 Z9 2 U1 0 U2 0 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 MAY PY 1992 VL 38 IS 5 BP 768 EP 775 PG 8 WC Medical Laboratory Technology SC Medical Laboratory Technology GA HU749 UT WOS:A1992HU74900031 PM 1582034 ER PT J AU KANG, J BUTLER, PB BAER, MR AF KANG, J BUTLER, PB BAER, MR TI A THERMOMECHANICAL ANALYSIS OF HOT-SPOT FORMATION IN CONDENSED-PHASE, ENERGETIC MATERIALS SO COMBUSTION AND FLAME LA English DT Article ID ALUMINUM AB This article discusses the mechanics of shock-induced hot spot formation in porous, energetic materials. A hollow sphere configuration is used to simulate the dynamic and thermodynamic response of a single void centered in a field of condensed-phase energetic material. In addition to treating pore dynamics, the hot spot model includes energy balances for the pore gas and surrounding material. Important thermal processes such as viscoplastic heating, finite rate chemical effects, and heat exchange between the pore gas and surrounding material are also evaluated. The governing conservation equations together with the initial and interface conditions are solved numerically for a series of test cases for a nitramine material. The results show that viscoplastic heating is an effective mechanism for shock initiation of Porous, energetic materials, In addition, it is demonstrated that the initial porosity of the material, the initial pore size and the material viscosity have strong influences on hot spot formation. C1 SANDIA NATL LABS,DEPT FLUID & THERMAL SCI,ALBUQUERQUE,NM 87185. RP KANG, J (reprint author), UNIV IOWA,DEPT MECH ENGN,IOWA CITY,IA 52242, USA. NR 36 TC 52 Z9 59 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAY PY 1992 VL 89 IS 2 BP 117 EP 139 DI 10.1016/0010-2180(92)90023-I PG 23 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA HT854 UT WOS:A1992HT85400001 ER PT J AU MASRI, AR DIBBLE, RW BARLOW, RS AF MASRI, AR DIBBLE, RW BARLOW, RS TI THE STRUCTURE OF TURBULENT NONPREMIXED FLAMES OF METHANOL OVER A RANGE OF MIXING RATES SO COMBUSTION AND FLAME LA English DT Article ID AIR; EXTINCTION AB The blowoff and electrical connectedness characteristics of pilot-stabilized turbulent nonpremixed flames of methanol fuel are presented. Using the joint Raman-Rayleigh-LIF technique, simultaneous space- and time-resolved measurements of temperature and the mass fractions of CH3OH, CO, CO2, H2, H2O, O2, and N2 are also shown for a number of measurement locations. Flames with slow mixing rates as well as ones close to blowoff are investigated. The results are presented in the form of scatter plots as well as probability density functions conditioned with respect to mixture fraction for a number of mixture fraction ranges selected within the reactive zone for methanol. The local extinction characteristics in the flames are also studied by adopting a temperature threshold below which fluid samples are assumed to be extinguished. It is found that the flame becomes electrically disconnected completely while it remains visibly and aurally stable for a range of velocities just below blowoff. Measurements in regions of the flames where the mixing rates are relatively low show little difference between the turbulent flame data and the laminar flame compositions only on the lean side of stoichiometric. For rich mixtures, however, the peak-measured mass fractions of CO and H2 are about 70% higher than those for laminar flamelets while the mass fractions of CO2 and H2O are lower than those of highly stretched laminar flamelets. Localized extinction remains uniformly low until the flame jet velocity is about 80% of the blowoff velocity. With higher flame jet velocities, localized extinction increases sharply until global blowoff is reached. The flame's approach to global blowoff is mainly bimodal for lean and stoichiometric mixtures but less bimodal for rich ones. This bimodality, however, is less distinct than in methane flames. C1 UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720. SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. RP MASRI, AR (reprint author), UNIV SYDNEY,DEPT MECH ENGN,SYDNEY,NSW 2006,AUSTRALIA. NR 35 TC 37 Z9 37 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAY PY 1992 VL 89 IS 2 BP 167 EP 185 DI 10.1016/0010-2180(92)90026-L PG 19 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA HT854 UT WOS:A1992HT85400004 ER PT J AU WAGNER, RG AF WAGNER, RG TI A MONTE-CARLO PROGRAM FOR GENERATING QED RADIATIVE DECAY W-EVENT AND Z-EVENT SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID COLLISIONS; BOSON; MASS; W+/ AB The program WZRAD which generates Monte Carlo weak gauge boson events including QED radiative decay is described. The program uses the single-photon approximation when generating three-body decays of W or Z to lepton, antilepton, and photon. The validity of this approximation is discussed, the formulae used to generate kinematic variables for the boson and its decay products are given, the common blocks and subroutines of the program are described, the procedure for obtaining and running the program is given, and examples of program output are provided. RP WAGNER, RG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 17 TC 10 Z9 10 U1 0 U2 0 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 MAY PY 1992 VL 70 IS 1 BP 15 EP 31 DI 10.1016/0010-4655(92)90087-F PG 17 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA HT370 UT WOS:A1992HT37000002 ER PT J AU LOPEZ, JA RANDRUP, J AF LOPEZ, JA RANDRUP, J TI SOS - SEQUENTIAL OR SIMULTANEOUS NUCLEAR MULTIFRAGMENTATION SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article DE NUCLEAR COLLISIONS; STATISTICALLY GENERATED MULTIFRAGMENT EVENTS; SEQUENTIAL AND PROMPT NUCLEAR DECAYS AB A computer code that simulates the phenomenon of nuclear fragmentation occurring in nuclear collisions at intermediate energies is presented. To underline the observable distinctions between different breakup mechanisms, the code produces multifragment events using a sequential binary decay and a simultaneous breakup resulting in two sets of momenta distributions with the same mass distribution and total energy. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP LOPEZ, JA (reprint author), UNIV TEXAS,DEPT PHYS,EL PASO,TX 79968, USA. NR 4 TC 6 Z9 6 U1 0 U2 0 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 MAY PY 1992 VL 70 IS 1 BP 92 EP 96 DI 10.1016/0010-4655(92)90094-F PG 5 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA HT370 UT WOS:A1992HT37000009 ER PT J AU DUNIGAN, TH AF DUNIGAN, TH TI HYPERCUBE CLOCK SYNCHRONIZATION SO CONCURRENCY-PRACTICE AND EXPERIENCE LA English DT Article AB Algorithms for synchronizing the times and frequencies of the clocks of Intel and Ncube hypercube multiprocessors are presented. Bounds for the error in estimating clock offsets and frequencies are formulated in terms of the clock read error and message transmission time. Clock and communication performance of the Ncube and Intel hypercubes are analysed, and performance of the synchronization algorithms is presented. C1 OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. NR 14 TC 5 Z9 5 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 MAY PY 1992 VL 4 IS 3 BP 257 EP 268 DI 10.1002/cpe.4330040305 PG 12 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA HV204 UT WOS:A1992HV20400004 ER PT J AU FORD, NB COBB, V AF FORD, NB COBB, V TI TIMING OF COURTSHIP IN 2 COLUBRID SNAKES OF THE SOUTHERN UNITED-STATES SO COPEIA LA English DT Note ID THAMNOPHIS-SIRTALIS-PARIETALIS; SIDED GARTER SNAKE; REPRODUCTIVE-CYCLE; MATING-BEHAVIOR; TROPIDOCLONION; TEMPERATURE; LINEATUM C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 28 TC 2 Z9 2 U1 0 U2 0 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS BUSINESS OFFICE PI CARBONDALE PA SOUTHERN ILLINOIS UNIV, DEPT ZOOLOGY, CARBONDALE, IL 62901-6501 SN 0045-8511 J9 COPEIA JI Copeia PD MAY 1 PY 1992 IS 2 BP 573 EP 577 PG 5 WC Zoology SC Zoology GA HT728 UT WOS:A1992HT72800036 ER PT J AU ALLAN, ML CHERRY, BW AF ALLAN, ML CHERRY, BW TI FACTORS CONTROLLING THE AMOUNT OF CORROSION FOR CRACKING IN REINFORCED-CONCRETE SO CORROSION LA English DT Article DE CORROSION-INDUCED CRACKING; FAILURE PRESSURE; TOUGHNESS; FLAW SIZE; REINFORCED CONCRETE AB Some of the factors that control the pressure due to the formation of corrosion products to cause failure of reinforced concrete were determined experimentally. The failure pressure is controlled predominantly by the toughness of the cover concrete and the bar/concrete interface and the size of air voids and microcracks. Failure pressure is not directly controlled by mix proportions. C1 MONASH UNIV,CLAYTON,VIC 3168,AUSTRALIA. RP ALLAN, ML (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. RI Berndt, Marita/D-1901-2014 OI Berndt, Marita/0000-0002-6622-0597 NR 5 TC 6 Z9 6 U1 0 U2 2 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD MAY PY 1992 VL 48 IS 5 BP 426 EP 430 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JF854 UT WOS:A1992JF85400011 ER PT J AU SALVADORI, MC AGER, JW BROWN, IG AF SALVADORI, MC AGER, JW BROWN, IG TI DIAMOND GROWTH ON SILICON-NITRIDE BY MICROWAVE PLASMA CHEMICAL VAPOR-DEPOSITION SO DIAMOND AND RELATED MATERIALS LA English DT Article ID ION IMPLANTATION FACILITY; RESISTANCE; DAMAGE; FILMS C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RI Salvadori, Maria Cecilia/A-9379-2013; OI Ager, Joel/0000-0001-9334-9751 NR 21 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD MAY 1 PY 1992 VL 1 IS 7 BP 818 EP 823 DI 10.1016/0925-9635(92)90107-Y PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA JE679 UT WOS:A1992JE67900011 ER PT J AU RUSSELL, M AF RUSSELL, M TI LESSONS FROM NAPAP SO ECOLOGICAL APPLICATIONS LA English DT Article DE ACID RAIN; LESSONS LEARNED; NAPAP; NATIONAL ACID PRECIPITATION ASSESSMENT PROGRAM; POLICY ANALYSIS; POLITICAL CONSENSUS; SCIENCE-PUBLIC POLICY INTERFACE AB NAPAP was an institutional innovation of great benefit in bringing the United States to a decision on acid precipitation control. The nation's return from the $600 000 000 investment in NAPAP will be greater still if the lessons learned in the course of its existence are put to proper use in the future. This essay concentrates on the lessons learned about the interface between science and public policy as experienced in NAPAP. C1 UNIV TENNESSEE,DEPT ECON & ENERGY,CTR ENVIRONM & RESOURCES,KNOXVILLE,TN 37996. RP RUSSELL, M (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 2 TC 13 Z9 13 U1 0 U2 1 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD MAY PY 1992 VL 2 IS 2 BP 107 EP 110 DI 10.2307/1941765 PG 4 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA HR338 UT WOS:A1992HR33800002 PM 27759203 ER PT J AU MEIER, A RAINER, L GREENBERG, S AF MEIER, A RAINER, L GREENBERG, S TI MISCELLANEOUS ELECTRICAL ENERGY USE IN HOMES SO ENERGY LA English DT Article AB About 18% of all U.S. residential electricity, or 1600 kWh/yr per household, is used for miscellaneous appliances. Such appliances include waterbeds, dehumidifiers, television sets, well pumps, and clocks. The saturations, stocks, and electricity use for 35 appliances within the miscellaneous category have been estimated. Nationally, few miscellaneous appliances consume more than 2% of total electricity use, compared to 20% for refrigerators and 12% for electric water heating. However, in any given home, one of several miscellaneous appliances could be among the largest consumers of electricity. Failure to recognize the contribution of miscellaneous appliances to overall electricity demand can lead to erroneous forecasts because their demand is incorrectly attributed to space heating, air conditioning, refrigeration, and other standard end uses. In addition, there will be smaller savings from conservation programs aimed at standard end uses. Several trends suggest that the energy use of miscellaneous appliances will grow. In some new homes, miscellaneous appliances account for more than 40% of total electricity use. RP MEIER, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BLDG 90,BERKELEY,CA 94720, USA. NR 23 TC 12 Z9 12 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD MAY PY 1992 VL 17 IS 5 BP 509 EP 518 DI 10.1016/0360-5442(92)90087-G PG 10 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA HH935 UT WOS:A1992HH93500007 ER PT J AU CAMBEL, AB MOCK, JE AF CAMBEL, AB MOCK, JE TI ITERATED FUNCTION SYSTEMS FOR GEOTHERMAL-ENERGY EXPLORATION SO ENERGY LA English DT Note ID PORE AB A simple method for enhancing geothermal resource exploration is proposed. This utilizes iterated function systems (IFS). Both the hardware and software packages are readily available. C1 US DOE,DIV GEOTHERMAL,WASHINGTON,DC 20585. RP CAMBEL, AB (reprint author), GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052, USA. NR 10 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 0360-5442 J9 ENERGY JI Energy PD MAY PY 1992 VL 17 IS 5 BP 519 EP 522 DI 10.1016/0360-5442(92)90088-H PG 4 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA HH935 UT WOS:A1992HH93500008 ER PT J AU STEINBERG, M AF STEINBERG, M TI HISTORY OF CO2 GREENHOUSE GAS MITIGATION TECHNOLOGIES SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL CONF ON CARBON DIOXIDE REMOVAL ( ICCDR ) CY MAR 04-06, 1992 CL AMSTERDAM, NETHERLANDS SP MINIST HOUSING, PHYS PLANNING & ENVIRONM NETHERLANDS, COMMISS EUROPEAN COMMUNITIES, US DOE, INT ENERGY AGCY, ROYAL NETHERLANDS ACAD ARTS & SCI, DUTCH ELECT GENERATING BOARD SEP, SHELL NEDERLAND, STATOIL NETHERLANDS, UNIV UTRECHT DE CARBON DIOXIDE; GREENHOUSE; MITIGATION AB Much effort has been expended in the last several decades on the science of radiative gases in the atmosphere and particularly CO2 as a greenhouse gas. Only in the last few years has interest grown in the technology of CO2 mitigation. A discussion is given on the early development of CO2 mitigation concepts which has led to a surge in this activity worldwide and especially in Japan. The history of CO2 greenhouse gas mitigation is short and is actually being made at this First International Conference on the subject. RP STEINBERG, M (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 14 Z9 15 U1 0 U2 0 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 MAY-AUG PY 1992 VL 33 IS 5-8 BP 311 EP 315 DI 10.1016/0196-8904(92)90025-R PG 5 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA JA736 UT WOS:A1992JA73600006 ER PT J AU SUMMERS, JS AF SUMMERS, JS TI REDUCTION OF CARBON-DIOXIDE EMISSIONS THROUGH EFFICIENCY IMPROVEMENTS IN IGCC ELECTRICAL-POWER GENERATION SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL CONF ON CARBON DIOXIDE REMOVAL ( ICCDR ) CY MAR 04-06, 1992 CL AMSTERDAM, NETHERLANDS SP MINIST HOUSING, PHYS PLANNING & ENVIRONM NETHERLANDS, COMMISS EUROPEAN COMMUNITIES, US DOE, INT ENERGY AGCY, ROYAL NETHERLANDS ACAD ARTS & SCI, DUTCH ELECT GENERATING BOARD SEP, SHELL NEDERLAND, STATOIL NETHERLANDS, UNIV UTRECHT DE GASIFICATION; REPOWERING; CO2 EMISSIONS; IGCCS; COAL UTILIZATION; CLEAN COAL TECHNOLOGY PROGRAM AB The United States of America, Department of Energy (DOE) is cost sharing with industry a program in excess of $6 billion (US) for the demonstration of coal technologies to advance efficiency and improve environmental performance for the generation of power. Currently, the program consists of over forty (40) projects, demonstrating technologies developed in the USA, Japan, and Europe. These technologies could retrofit or repower existing facilities or be applied in the construction of "greenfield" plants. Using a pulverized coal fired power facility with a scrubber as a reference, the retrofit technologies being demonstrated provide high SO2/NOx removal potential, but offer little efficiency improvement over commercially proven technologies. On the same comparison bases, the integrated coal gasification technologies being demonstrated have the capability of improving the coal to bus bar efficiency as much as to twenty-five percent (25%), resulting in a corresponding reduction in' carbon dioxide emissions. RP SUMMERS, JS (reprint author), US DOE,OFF CLEAN COAL TECHNOL,WASHINGTON,DC 20585, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD MAY-AUG PY 1992 VL 33 IS 5-8 BP 713 EP 719 DI 10.1016/0196-8904(92)90076-9 PG 7 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA JA736 UT WOS:A1992JA73600057 ER PT J AU MORRIS, SC LEE, J GOLDSTEIN, G STEINBERG, M AF MORRIS, SC LEE, J GOLDSTEIN, G STEINBERG, M TI COMPARISON OF PRECOMBUSTION AND POSTCOMBUSTION CARBON REMOVAL SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL CONF ON CARBON DIOXIDE REMOVAL ( ICCDR ) CY MAR 04-06, 1992 CL AMSTERDAM, NETHERLANDS SP MINIST HOUSING, PHYS PLANNING & ENVIRONM NETHERLANDS, COMMISS EUROPEAN COMMUNITIES, US DOE, INT ENERGY AGCY, ROYAL NETHERLANDS ACAD ARTS & SCI, DUTCH ELECT GENERATING BOARD SEP, SHELL NEDERLAND, STATOIL NETHERLANDS, UNIV UTRECHT DE CARBON DIOXIDE; ENERGY SYSTEMS; COAL; GLOBAL CLIMATE AB Conventional approaches to reduce CO2 emissions, including fuel switching among fossil fuels, renewables, nuclear, end-use conservation, and increased efficiency, nearly all lead to reduction in coal use. Carbon removal technologies alone have the potential to allow continued use of coal. All approaches must compete economically, technically, and environmentally for market share within the context of the total energy system. MARKAL, a dynamic energy systems model, was used to simulate this competition through 2025 for the U.S. energy system. Three carbon removal technologies were evaluated: CO2 scrubbing from coal-fired power plant flue gas, CO2 separation during coal gasification, and carbon separation in the Hydrocarb process. CO2 was sequestered in depleted gas wells and the deep ocean, and solid carbon in depleted coal mines. All three technologies evaluated offer a more cost-effective path to CO2 emission reduction than the reference case. Moreover, the ability of pre-combustion methods of carbon removal can be combined with producing motor fuels as well as electric power fuels, a combination that provided greater opportunity for carbon removal. RP MORRIS, SC (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 1 Z9 1 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD MAY-AUG PY 1992 VL 33 IS 5-8 BP 747 EP 754 DI 10.1016/0196-8904(92)90080-G PG 8 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA JA736 UT WOS:A1992JA73600061 ER PT J AU HEDGES, SW YEH, JT AF HEDGES, SW YEH, JT TI KINETICS OF SULFUR-DIOXIDE UPTAKE ON SUPPORTED CERIUM OXIDE SORBENTS SO ENVIRONMENTAL PROGRESS LA English DT Article AB A thermogravimetric technique has been used to evaluate the apparent rate of SO2 absorption by ceria supported on alumina. A kinetic model for the sulfation of the CeO2/Al2O3 sorbent has been developed that is first order with respect to the partial pressure of SO2 and first order with respect to the fractional unreacted cerium oxide on the sorbent. The reaction was also found to be zero order with respect to the oxygen and water vapor content of the gas over a range of concentrations that might reasonably be encountered in actual flue gas streams. CeO2/Al2O3 sorbent is being studied at the Pittsburgh Energy Technology Center as a potential new sorbent for simultaneous removal of 90+% of both SO2 and NO(x) from coal combustion flue gas in a dry, regenerable process. RP HEDGES, SW (reprint author), US DOE,PITTSBURGH ENERGY RES CTR,POB 10940,PITTSBURGH,PA 15213, USA. NR 0 TC 15 Z9 16 U1 0 U2 4 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0278-4491 J9 ENVIRON PROG JI Environ. Prog. PD MAY PY 1992 VL 11 IS 2 BP 98 EP 103 DI 10.1002/ep.670110215 PG 6 WC Engineering, Environmental; Engineering, Chemical; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HW484 UT WOS:A1992HW48400005 ER PT J AU NORTON, GA AF NORTON, GA TI A REVIEW OF TRACE-ELEMENT EMISSIONS FROM THE COMBUSTION OF REFUSE-DERIVED FUEL WITH COAL SO ENVIRONMENTAL PROGRESS LA English DT Article AB The effects of cocombusting refuse-derived fuel (RDF) with coal on stack emissions of trace elements in the ash stream were reviewed. The large number of variables and uncertainties involved precluded drawing definitive conclusions regarding many of the trace elements. However, it is evident that cocombustion resulted in increased emissions of Cd, Cu, Hg, Pb, and Zn. Emissions of As and Ni tended to decrease when RDF was fired with coal. Modeling studies indicated that ambient levels of trace elements during cocombustion should be within acceptable limits. However, periodic monitoring of Cd, Hg, and Pb may be warranted in some instances. RP NORTON, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 0 TC 8 Z9 8 U1 1 U2 1 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0278-4491 J9 ENVIRON PROG JI Environ. Prog. PD MAY PY 1992 VL 11 IS 2 BP 140 EP 144 DI 10.1002/ep.670110221 PG 5 WC Engineering, Environmental; Engineering, Chemical; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HW484 UT WOS:A1992HW48400011 ER PT J AU KOCHER, DC HOFFMAN, FO AF KOCHER, DC HOFFMAN, FO TI REGULATING ENVIRONMENTAL CARCINOGENS - REPLY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Letter C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP KOCHER, DC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAY PY 1992 VL 26 IS 5 BP 845 EP 846 DI 10.1021/es00029a611 PG 2 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HR623 UT WOS:A1992HR62300004 ER PT J AU PARKER, DR BERTSCH, PM AF PARKER, DR BERTSCH, PM TI IDENTIFICATION AND QUANTIFICATION OF THE AL13 TRIDECAMERIC POLYCATION USING FERRON SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; HYDROXY-ALUMINUM SOLUTIONS; 3 SPECTROPHOTOMETRIC METHODS; POLYNUCLEAR ALUMINUM; SURFACE-IONIZATION; A1(III) HYDROLYSIS; WATER-TREATMENT; AL-27 NMR; SPECIATION; MONONUCLEAR AB Historically, Al-27-NMR spectroscopy has been required for definitive identification of the AlO4Al12(OH)24(H2O)12(7+) polycation ("Al13"), but recent studies suggest that it might be equatable to the polynuclear Al fraction that exhibits a moderate reaction rate with the spectrophotometric ferron reagent (Alb). Our objectives were to further test this correspondence and to critically evaluate the ferron-Al13 reaction kinetics. Partially neutralized solutions were prepared with [Al]T = l0(-4)-10(-2) mol L-1, hydrolysis ratios of 0.8-2.4, and base injection rates of 0.2-20 mL h-1. These solutions were quantitatively analyzed using ferron and Al-27 NMR, and the results confirmed that the Alb fraction measured with ferron corresponds to Al13 in freshly prepared solutions. The apparent pseudo-first-order rate coefficient for the ferron-Al(b) reaction (k(b)) is dependent on the total ferron concentration in the reaction mixture. Examination of fitted k(b) values from this work and from some previous studies revealed that they are, if properly evaluated, indeed consistent and predictable, permitting near-certain identification of Al13. The ferron method thus offers a simple and inexpensive alternative to Al-27-NMR analyses and allows quantification of Al13 at concentrations 10-100-fold lower than presently analyzable by NMR, a concentration range pertinent to natural waters. C1 UNIV GEORGIA,DIV BIOGEOCHEM,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP PARKER, DR (reprint author), UNIV CALIF RIVERSIDE,DEPT SOIL & ENVIRONM SCI,RIVERSIDE,CA 92521, USA. NR 60 TC 142 Z9 160 U1 1 U2 36 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 MAY PY 1992 VL 26 IS 5 BP 908 EP 914 DI 10.1021/es00029a006 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HR623 UT WOS:A1992HR62300016 ER PT J AU PARKER, DR BERTSCH, PM AF PARKER, DR BERTSCH, PM TI FORMATION OF THE AL13 TRIDECAMERIC POLYCATION UNDER DIVERSE SYNTHESIS CONDITIONS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; HYDROXY-ALUMINUM SOLUTIONS; EARLY LIFE STAGES; RAINBOW-TROUT; GILL MICROENVIRONMENT; POSSIBLE MECHANISMS; RHIZOBIUM-TRIFOLII; SALMO-GAIRDNERI; WATER-TREATMENT; BROOK TROUT AB Recent studies using Al-27-NMR spectroscopy indicate that the polynuclear hydroxo-Al fraction that exhibits a moderate reaction rate with the ferron reagent can be equated to the Al13 tridecamer, and we utilized this correspondence to examine the formation of Al13 over a broad range of synthesis conditions, including some pertinent to natural waters. Ferron and NMR analyses revealed that solutions ([Al]T = 2 x 10(-5)-5 x 10(-3) mol L-1) partially neutralized with aqueous NaHCO3 contained from 26 to 87% of Al(T) as the tridecamer. Solutions neutralized with solid CaCO3 or MgO, or with NH3 vapor, also contained substantial quantities (14-46% of Al(T)) of Al13. Bi-carbonate-neutralized solutions were also prepared by injecting base into an acidic Al solution (forward method), by injecting the Al solution into the base (reverse method), and by simultaneous injection of the two solutions. The latter two methods resulted in less Al13 formation than the forward method, and our results thus suggest that Al13 can, but does not always, form in a variety of settings characterized by inhomogeneous conditions at the interface between solutions of differing pH and alkalinity/acidity. Scrutiny of these and previously published results revealed that the "yield" of the tridecamer diminishes with decreasing Al(T), but that it can still be a significant component of solutions with Al(T) concentrations as low as 10(-5) mol L-1. C1 UNIV GEORGIA,DIV BIOGEOCHEM,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP PARKER, DR (reprint author), UNIV CALIF RIVERSIDE,DEPT SOIL & ENVIRONM SCI,RIVERSIDE,CA 92521, USA. NR 58 TC 105 Z9 117 U1 2 U2 14 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 MAY PY 1992 VL 26 IS 5 BP 914 EP 921 DI 10.1021/es00029a007 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HR623 UT WOS:A1992HR62300017 ER PT J AU SHANNON, JD VOLDNER, EC AF SHANNON, JD VOLDNER, EC TI DEPOSITION OF S AND NOX NITROGEN TO THE GREAT-LAKES ESTIMATED WITH A REGIONAL DEPOSITION MODEL SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ATMOSPHERIC TRANSPORT; EL-NINO; CLIMATE; ECOSYSTEM; TOXAPHENE; SEASON AB Atmospheric loading of anthropogenic S and NO(x) N to the Great Lakes is estimated with a regional deposition model. Dry deposition calculations include the effects of the wet surface and the predominant seasonal atmospheric boundary-layer structure over the lakes, i.e., strong stability in spring and summer and strong instability in autumn and winter. Modeling results are generally consistent with objective analyses of observed deposition. Best agreement is shown for the lower lakes; the model appears to underestimate deposition to Lake Superior, particularly for S. The analyses themselves contain large uncertainties, especially for Lake Superior, because all monitoring is over land and dry deposition monitoring is also both sparse and indirect. Examination of S and N mass budgets for Lake Superior indicates that the atmospheric pathway plays an important role in total loading and that the atmospheric pathway is more important for N than for S. An examination of modeled and observed S deposition trends during the 1980s illustrates the difficulty in separating possible emission-related trends in deposition from meteorologically induced variability and uncertainties in modeling or analysis when the emission changes are relatively small. C1 ENVIRONM CANADA,ATOMOSPHER ENVIRONM SERV,TORONTO M3H 5T4,ONTARIO,CANADA. RP SHANNON, JD (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 25 TC 5 Z9 5 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAY PY 1992 VL 26 IS 5 BP 970 EP 978 DI 10.1021/es00029a016 PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HR623 UT WOS:A1992HR62300026 ER PT J AU GILBERT, ES AF GILBERT, ES TI LEUKEMIA AMONG NUCLEAR WORKERS WITH PROTRACTED EXPOSURE TO LOW-DOSE IONIZING-RADIATION SO EPIDEMIOLOGY LA English DT Letter RP GILBERT, ES (reprint author), PACIFIC NW LAB, MS P7-82, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 4 Z9 4 U1 1 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1044-3983 J9 EPIDEMIOLOGY JI Epidemiology PD MAY PY 1992 VL 3 IS 3 BP 275 EP 276 DI 10.1097/00001648-199205000-00021 PG 2 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA HT912 UT WOS:A1992HT91200022 PM 1591331 ER PT J AU MILLER, DJ GRAY, KE KAMPWIRTH, RT MURDUCK, JM AF MILLER, DJ GRAY, KE KAMPWIRTH, RT MURDUCK, JM TI STUDIES OF GROWTH INSTABILITIES AND ROUGHENING IN SPUTTERED NBN FILMS USING A MULTILAYER DECORATION TECHNIQUE SO EUROPHYSICS LETTERS LA English DT Article ID ELECTRON-MICROSCOPY; INTERFACE GROWTH AB A number of recent theories predict scaling laws for the roughening of growing thin films. We present a powerful new experimental technique for studying the internal morphology of films exhibiting roughening, together with preliminary results first demonstrating some fundamental aspects of these models. Sputtered films of NbN are decorated periodically by AlN layers and examined by cross-section transmission electron microscopy to reveal scaling-law growth and parabolic-capped columns whose diameter and layer roughness (interface width) increase with time (i.e. film thickness). RP MILLER, DJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 14 TC 20 Z9 20 U1 0 U2 2 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAY 1 PY 1992 VL 19 IS 1 BP 27 EP 32 DI 10.1209/0295-5075/19/1/005 PG 6 WC Physics, Multidisciplinary SC Physics GA HV135 UT WOS:A1992HV13500005 ER PT J AU PENALBA, M ARNAU, A ECHENIQUE, PM FLORES, F RITCHIE, RH AF PENALBA, M ARNAU, A ECHENIQUE, PM FLORES, F RITCHIE, RH TI STOPPING POWER FOR PROTONS IN ALUMINUM SO EUROPHYSICS LETTERS LA English DT Article ID CHANGING CROSS-SECTIONS; CHARGE STATES; ELECTRON-GAS; SOLID MEDIA; SLOW IONS; PROJECTILE; TARGET AB The electronic stopping power of aluminum metal for protons has been calculated with explicit account taken of the different charge states of the photon inside the medium. The fraction of negative ions (H-) neutral atoms (H-0) and bare protons (H+) in the beam as a function of ion speed are derived from the capture and loss cross-sections. The total stopping power is then obtained by weighting the calculated partial stopping powers with the appropriate charge state fractions. The energy loss per unit path length due to electronic exchange processes is also evaluated. Our calculations show that the relative contribution to the stopping power from capture and loss processes is of the order of 15% for the case of protons moving in aluminum. Good agreement with experimental data is found. C1 UNIV AUTONOMA MADRID, DEPT FIS MAT CONDENSADA, E-28049 MADRID, SPAIN. OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, OAK RIDGE, TN 37831 USA. RP PENALBA, M (reprint author), UNIV BASQUE COUNTRY, FAC QUIM, DEPT FIS MAT, APARTADO 1072, E-20080 SAN SEBASTIAN, SPAIN. RI Flores, fernando/K-2362-2014; arnau, andres/H-7901-2012; OI arnau, andres/0000-0001-5281-3212; Penalba, Miriam/0000-0002-0978-7765 NR 35 TC 44 Z9 44 U1 0 U2 3 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAY 1 PY 1992 VL 19 IS 1 BP 45 EP 50 DI 10.1209/0295-5075/19/1/008 PG 6 WC Physics, Multidisciplinary SC Physics GA HV135 UT WOS:A1992HV13500008 ER PT J AU BRECHER, G REDFEARN, WJ NEBEN, S AF BRECHER, G REDFEARN, WJ NEBEN, S TI DISAPPEARANCE AND REAPPEARANCE OF STEM-CELL CLONES SO EXPERIMENTAL HEMATOLOGY LA English DT Editorial Material ID RENEWAL C1 UNIV CALIF BERKELEY,PROGRAM BIOSTAT,BERKELEY,CA 94720. GENET INST,CAMBRIDGE,MA. RP BRECHER, G (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. NR 19 TC 6 Z9 6 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD MAY PY 1992 VL 20 IS 4 BP 383 EP 385 PG 3 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA HT028 UT WOS:A1992HT02800001 PM 1568453 ER PT J AU EBBE, S DALAL, K FORTE, T TABLIN, F AF EBBE, S DALAL, K FORTE, T TABLIN, F TI MICROCYTIC THROMBOCYTOSIS, SMALL MEGAKARYOCYTES, PLATELET LIPIDS AND HYPERREACTIVITY TO COLLAGEN, LYMPHOCYTOPENIA, EOSINOPHILIA, AND LOW BLOOD-VOLUME IN GENETICALLY HYPERLIPIDEMIC RABBITS SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE PLATELET MASS; MEGAKARYOCYTE SIZE AND PLOIDY; PLASMA LIPIDS; LYMPHOCYTOPENIA; EOSINOPHILIA; BLOOD VOLUME ID DENSITY LIPOPROTEIN RECEPTOR; OMEGA-3 FATTY-ACIDS; FAMILIAL HYPERCHOLESTEROLEMIA; FISH-OIL; BLEEDING-TIME; WHHL-RABBIT; ATHEROSCLEROSIS; PLASMA; CELLS; HYPERLIPOPROTEINEMIA AB Three- to 15-month-old rabbits with Watanabe heritable hyperlipidemia (WHHL) were tested to determine if hematological abnormalities would accompany the known hyperlipidemia and deficiency of receptors for low-density lipoprotein; the findings were compared to those of New Zealand white (NZW) rabbits of the same ages. WHHL plasma cholesterol and triglyceride levels were always greater-than-or-equal-to 6 x those of NZW, and both were lower in older than in younger WHHL rabbits. From age 7 to 18 months, WHHL platelet counts were higher than those of age-matched NZW; the average for all WHHL was 1.45 x that for NZW (p = 0.001). Average WHHL mean platelet volume (MPV) was 0.94 x that for NZW (p = 0.025), with a tendency for greater microcytosis to occur at more advanced ages; electron microscopy supported the small size of WHHL platelets. WHHL platelet mass per microliter of blood (platelet count x MPV) was 1.39 x that of NZW (p = 0.001), with differences occurring after the age of 6 months. The average WHHL blood volume was 18.3% less than in NZW (33.5 vs 41.0 ml/kg body weight) (p = 0.00005), so platelet count and mass per kilogram of body weight were similar in the two strains. The predominant ploidy of mature megakaryocytes from each strain was 32N; megakaryocytes were smaller in WHHL than NZW due to a smaller size of 32N cells (p = 0.002). Total leukocyte counts were the same in WHHL and NZW rabbits, but eosinophils were 32% higher (p = 0.037) and lymphocytes 34% lower (p = 0.008) in WHHL. Hematocrits and reticulocytes did not differ. Platelet-free cholesterol was 1.2 x, esterified cholesterol 11.3 x, phospholipids 0.9 x, triglyceride 2.4 x, and free cholesterol/phospholipid molar ratio 1.29 x corresponding values in NZW platelets. WHHL platelets released more serotonin in response to a small dose (5-mu-g/ml) of collagen than did NZW platelets. These findings suggest that: 1) megakaryocytopoiesis and leukopoiesis are affected by lipid metabolism and/or LDL receptors, and 2) platelet production may be regulated more by the total mass of platelets than by their concentration in the blood. C1 UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. UNIV CALIF DAVIS,DAVIS,CA 95616. RP EBBE, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BLDG 74,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NCRR NIH HHS [RR05918, RR05457]; NHLBI NIH HHS [HL18574] NR 65 TC 12 Z9 12 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD MAY PY 1992 VL 20 IS 4 BP 486 EP 493 PG 8 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA HT028 UT WOS:A1992HT02800020 PM 1568466 ER PT J AU DEPABLO, JJ BONNIN, M PRAUSNITZ, JM AF DEPABLO, JJ BONNIN, M PRAUSNITZ, JM TI VAPOR-LIQUID-EQUILIBRIA FOR POLYATOMIC FLUIDS FROM SITE SITE COMPUTER-SIMULATIONS - PURE HYDROCARBONS AND BINARY-MIXTURES CONTAINING METHANE SO FLUID PHASE EQUILIBRIA LA English DT Article ID MONTE-CARLO SIMULATION; PHASE-EQUILIBRIA; GIBBS ENSEMBLE AB Densities and enthalpies of vaporization for several alkanes have been calculated by dividing the molecules into sites (or groups) and then using Monte Carlo simulation with site-site Lennard-Jones potential energy functions. The properties of uniphase systems have been determined from simulations in the isobaric-isothermal ensemble. The properties of saturated (two-phase) systems have been computed by simulations in thc Gibbs ensemble. The intermolecular potential energy functions used in these simulations arc similar to those presented by Jorgensen, Madura and Swenson (1984, J. Am. Chem. Soc., 106: 6638). However, to cover an appreciable range of external conditions, the characteristic energy-epsilon used here is a linear function of site density. Site-site potential functions provide the microscopic analog of group contribution methods for estimation of thermodynamic properties. Good agreement with experiment is achieved for several pure hydrocarbons and for a few binary mixtures containing methane. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,201 GILMAN HALL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 13 TC 51 Z9 52 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD MAY 1 PY 1992 VL 73 IS 3 BP 187 EP 210 DI 10.1016/0378-3812(92)80010-7 PG 24 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA HX323 UT WOS:A1992HX32300001 ER PT J AU GOLDSTON, RJ AF GOLDSTON, RJ TI BURNING PLASMA-EXPERIMENT PHYSICS DESIGN DESCRIPTION SO FUSION TECHNOLOGY LA English DT Article RP GOLDSTON, RJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,RES COUNCIL,POB 451,PRINCETON,NJ 08543, USA. NR 2 TC 5 Z9 5 U1 0 U2 2 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 MAY PY 1992 VL 21 IS 3 BP 1050 EP 1055 PN 1 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000002 ER PT J AU NEILSON, GH AF NEILSON, GH TI DEVICE DESCRIPTION AND GENERAL PHYSICS REQUIREMENTS SO FUSION TECHNOLOGY LA English DT Article RP NEILSON, GH (reprint author), OAK RIDGE NATL LAB,MARTIN MARIETTA SYST INC,BURNING PLASMA EXPT PROJECT PHYS GRP,OAK RIDGE,TN 37831, USA. NR 6 TC 3 Z9 3 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 MAY PY 1992 VL 21 IS 3 BP 1056 EP 1075 PN 1 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000003 ER PT J AU GOLDSTON, RJ WALTZ, RE BATEMAN, G STOTLER, DP SINGER, CE KINSEY, J AF GOLDSTON, RJ WALTZ, RE BATEMAN, G STOTLER, DP SINGER, CE KINSEY, J TI CONFINEMENT SO FUSION TECHNOLOGY LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; TOKAMAK IGNITION PROJECTIONS; DIMENSIONAL TRANSPORT CODE; ENERGY CONFINEMENT; SIMULATIONS; PERFORMANCE; REACTOR; BALDUR; MODELS; FIELD C1 GEN ATOM INC,SAN DIEGO,CA 92186. UNIV ILLINOIS,DEPT NUCL ENGN,URBANA,IL 61801. RP GOLDSTON, RJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,RES COUNCIL,POB 451,PRINCETON,NJ 08543, USA. RI Stotler, Daren/J-9494-2015 OI Stotler, Daren/0000-0001-5521-8718 NR 69 TC 5 Z9 5 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 MAY PY 1992 VL 21 IS 3 BP 1076 EP 1112 PN 1 PG 37 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000004 ER PT J AU JARDIN, SC BELL, MG JOHNSON, JL KAYE, SM KESSEL, C LAHAYE, R MANICKAM, J PILLSBURY, R POMPHREY, N REIMAN, A SAYER, RO STRICKLER, DJ AF JARDIN, SC BELL, MG JOHNSON, JL KAYE, SM KESSEL, C LAHAYE, R MANICKAM, J PILLSBURY, R POMPHREY, N REIMAN, A SAYER, RO STRICKLER, DJ TI MAGNETOHYDRODYNAMIC EQUILIBRIUM AND STABILITY SO FUSION TECHNOLOGY LA English DT Article ID TOKAMAK; CONFINEMENT; TRANSPORT; RIPPLE C1 PRINCETON UNIV,DEPT ASTROPHYS SCI,PRINCETON,NJ 08544. OAK RIDGE NATL LAB,MARTIN MARIETTA SYST INC,OAK RIDGE,TN 37831. GEN ATON INC,SAN DIEGO,CA 92186. MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP JARDIN, SC (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Jardin, Stephen/E-9392-2010; pomphrey, neil/G-4405-2010 NR 47 TC 7 Z9 7 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1123 EP 1213 PN 1 PG 91 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000006 ER PT J AU BATCHELOR, DB CARTER, MD GOULDING, RH HOFFMAN, DJ HOSEA, JC JAEGER, EF KAYE, SM MAU, TK PHILLIPS, CK RYAN, PM SCHARER, JE SWAIN, DW TOLLIVER, JS WILSON, JR YUGO, JJ AF BATCHELOR, DB CARTER, MD GOULDING, RH HOFFMAN, DJ HOSEA, JC JAEGER, EF KAYE, SM MAU, TK PHILLIPS, CK RYAN, PM SCHARER, JE SWAIN, DW TOLLIVER, JS WILSON, JR YUGO, JJ TI ICRF HEATING SO FUSION TECHNOLOGY LA English DT Article ID ION-CYCLOTRON RANGE; FARADAY SCREEN; ANTENNAS; PLASMA; FREQUENCIES; SHEATHS C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024. UNIV WISCONSIN,DEPT ELECT & COMP ENGN,MADISON,WI 53706. RP BATCHELOR, DB (reprint author), OAK RIDGE NATL LAB,MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE,TN 37831, USA. NR 30 TC 3 Z9 3 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 MAY PY 1992 VL 21 IS 3 BP 1214 EP 1242 PN 1 PG 29 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000007 ER PT J AU PORKOLAB, M BONOLI, PT ENGLADE, RC KRITZ, A PRATER, R SMITH, GR AF PORKOLAB, M BONOLI, PT ENGLADE, RC KRITZ, A PRATER, R SMITH, GR TI ELECTRON-CYCLOTRON HEATING SO FUSION TECHNOLOGY LA English DT Article ID TOKAMAK C1 CUNY HUNTER COLL,NEW YORK,NY 10021. LEHIGH UNIV,DEPT PHYS,BETHLEHEM,PA 18015. GEN ATOM INC,SAN DIEGO,CA 92186. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT MAGNET FUS ENERGY,LIVERMORE,CA 94550. RP PORKOLAB, M (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1243 EP 1249 PN 1 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000008 ER PT J AU HOULBERG, WA AF HOULBERG, WA TI FUELING SO FUSION TECHNOLOGY LA English DT Article RP HOULBERG, WA (reprint author), OAK RIDGE NATL LAB,MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE,TN 37831, USA. NR 7 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 MAY PY 1992 VL 21 IS 3 BP 1250 EP 1255 PN 1 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000009 ER PT J AU HILL, DN BRAAMS, B HAINES, J MILOVICH, J ROGNLIEN, T STOTLER, DP ULRICKSON, M AF HILL, DN BRAAMS, B HAINES, J MILOVICH, J ROGNLIEN, T STOTLER, DP ULRICKSON, M TI BOUNDARY PHYSICS SO FUSION TECHNOLOGY LA English DT Article ID SCRAPE-OFF LAYER; HEATED DIVERTOR DISCHARGES; NULL POLOIDAL DIVERTOR; DIII-D; DOUBLET-III; PDX TOKAMAK; PLASMA; ASDEX; MODES; CONFINEMENT C1 NYU,COURANT INST MATH SCI,NEW YORK,NY 10010. MCDONNELL DOUGLAS CORP,ST LOUIS,MO 63166. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP HILL, DN (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Braams, Bastiaan/E-7687-2011; Stotler, Daren/J-9494-2015 OI Braams, Bastiaan/0000-0003-4086-9969; Stotler, Daren/0000-0001-5521-8718 NR 66 TC 5 Z9 5 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 MAY PY 1992 VL 21 IS 3 BP 1256 EP 1278 PN 1 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000010 ER PT J AU ULRICKSON, M BROOKS, JN DYLLA, HF GOLDSTON, RJ HAINES, JR HILL, DN LANGLEY, RA NEILSON, GH WILSON, KL AF ULRICKSON, M BROOKS, JN DYLLA, HF GOLDSTON, RJ HAINES, JR HILL, DN LANGLEY, RA NEILSON, GH WILSON, KL TI IMPURITY CONTROL AND MATERIALS PHYSICS SO FUSION TECHNOLOGY LA English DT Article ID FUSION TEST REACTOR; CARBON; GRAPHITE; DEPOSITION; DEUTERIUM; LIMITER; TRITIUM; PLASMA; TILES C1 SANDIA NATL LABS,LIVERMORE,CA 94550. ARGONNE NATL LAB,FUS PROGRAM,ARGONNE,IL 60439. COLLIDING ELECTRON BEAM ACCELERATOR FACIL,NEWPORT NEWS,VA 23606. MCDONNELL DOUGLAS CORP,ST LOUIS,MO 63166. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OAK RIDGE NATL LAB,MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE,TN 37831. RP ULRICKSON, M (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 47 TC 3 Z9 3 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 MAY PY 1992 VL 21 IS 3 BP 1279 EP 1291 PN 1 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000011 ER PT J AU MEDLEY, SS PEEBLES, WA YOUNG, KM AF MEDLEY, SS PEEBLES, WA YOUNG, KM TI DIAGNOSTICS SO FUSION TECHNOLOGY LA English DT Article C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RP MEDLEY, SS (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 0 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 MAY PY 1992 VL 21 IS 3 BP 1292 EP 1300 PN 1 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000012 ER PT J AU BELL, MG WOLFE, SM AF BELL, MG WOLFE, SM TI OPERATIONS PLAN SO FUSION TECHNOLOGY LA English DT Article C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP BELL, MG (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 0 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 MAY PY 1992 VL 21 IS 3 BP 1301 EP 1306 PN 1 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HQ880 UT WOS:A1992HQ88000013 ER PT J AU HAWRYLUK, RJ MUELLER, D HOSEA, J BARNES, CW BEER, M BELL, MG BELL, R BIGLARI, H BITTER, M BOIVIN, R BRETZ, NL BUDNY, R BUSH, CE CHEN, L CHENG, CZ COWLEY, S DARROW, DS EFTHIMION, PC FONCK, RJ FREDRICKSON, E FURTH, HP GREENE, G GREK, B GRISHAM, LR HAMMETT, G HEIDBRINK, W HILL, KW HOFFMAN, D HULSE, RA HSUAN, H JANOS, A JASSBY, DL JOBES, FC JOHNSON, DW JOHNSON, LC KAMPERSCHROER, J KESNER, J PHILLIPS, CK KILPATRICK, SJ KUGEL, H LAMARCHE, PH LEBLANC, B MANOS, DM MANSFIELD, DK MARMAR, ES MAZZUCATO, E MCCARTHY, MP MACHUZAK, J MAUEL, M MCCUNE, DC MCGUIRE, KM MEDLEY, SS MIKKELSEN, DR MONTICELLO, D NAGAYAMA, Y NAVRATIL, GA NAZIKIAN, R OWENS, DK PARK, H PARK, W PAUL, S PERKINS, F PITCHER, S RASMUSSEN, D REDI, MH REWOLDT, G ROBERTS, D ROQUEMORE, AL SABBAGH, S SCHILLING, G SCHIVELL, J SCHMIDT, GL SCOTT, SD SNIPES, J STEVENS, J STRATTON, BC STRACHAN, JD STODIEK, W SYNAKOWSKI, E TANG, W TAYLOR, G TERRY, J TIMBERLAKE, JR TOWNER, HH ULRICKSON, M VONGOELER, S WIELAND, R WILSON, JR WONG, KL WOSKOV, P YAMADA, M YOUNG, KM ZARNSTORFF, MC ZWEBEN, SJ AF HAWRYLUK, RJ MUELLER, D HOSEA, J BARNES, CW BEER, M BELL, MG BELL, R BIGLARI, H BITTER, M BOIVIN, R BRETZ, NL BUDNY, R BUSH, CE CHEN, L CHENG, CZ COWLEY, S DARROW, DS EFTHIMION, PC FONCK, RJ FREDRICKSON, E FURTH, HP GREENE, G GREK, B GRISHAM, LR HAMMETT, G HEIDBRINK, W HILL, KW HOFFMAN, D HULSE, RA HSUAN, H JANOS, A JASSBY, DL JOBES, FC JOHNSON, DW JOHNSON, LC KAMPERSCHROER, J KESNER, J PHILLIPS, CK KILPATRICK, SJ KUGEL, H LAMARCHE, PH LEBLANC, B MANOS, DM MANSFIELD, DK MARMAR, ES MAZZUCATO, E MCCARTHY, MP MACHUZAK, J MAUEL, M MCCUNE, DC MCGUIRE, KM MEDLEY, SS MIKKELSEN, DR MONTICELLO, D NAGAYAMA, Y NAVRATIL, GA NAZIKIAN, R OWENS, DK PARK, H PARK, W PAUL, S PERKINS, F PITCHER, S RASMUSSEN, D REDI, MH REWOLDT, G ROBERTS, D ROQUEMORE, AL SABBAGH, S SCHILLING, G SCHIVELL, J SCHMIDT, GL SCOTT, SD SNIPES, J STEVENS, J STRATTON, BC STRACHAN, JD STODIEK, W SYNAKOWSKI, E TANG, W TAYLOR, G TERRY, J TIMBERLAKE, JR TOWNER, HH ULRICKSON, M VONGOELER, S WIELAND, R WILSON, JR WONG, KL WOSKOV, P YAMADA, M YOUNG, KM ZARNSTORFF, MC ZWEBEN, SJ TI STATUS AND PLANS FOR TFTR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID ENERGETIC TRAPPED-PARTICLES; FUSION TEST REACTOR; MAGNETOHYDRODYNAMIC MODES; POLOIDAL ROTATION; HIGH-BETA; TOKAMAK; PLASMAS; STABILITY AB Recent research on TFTR has emphasized optimization of performance in deuterium plasmas, transport studies and studies of energetic ion and fusion product physics in preparation for the D-T experiments that will commence in July of 1993. TFTR has achieved full hardware design parameters, and the best TFTR discharges in deuterium are projected to Q(DT) of 0.3 to 0.5. The physics phenomena that will be studied during the D-T phase will include: tritium particle confinement and fueling, ICRF heating with tritium, species scaling with tritium, collective alpha-particle instabilities, alpha heating of the plasma and helium ash buildup. It is important for the fusion program that these physics issues be addressed to identify regimes of benign alpha behavior, and to develop techniques to actively stabilize or control instabilities driven by collective alpha effects. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV CALIF IRVINE,IRVINE,CA 92717. MIT,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV WISCONSIN,MADISON,WI 53706. UNIV TOKYO,TOKYO 113,JAPAN. COLUMBIA UNIV,NEW YORK,NY 10027. CANADIAN FUS FUELS TECHNOL PROJECT,TORONTO,ONTARIO,CANADA. RP HAWRYLUK, RJ (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Sabbagh, Steven/C-7142-2011; Hammett, Gregory/D-1365-2011; Cheng, Chio/K-1005-2014; Yamada, Masaaki/D-7824-2015 OI Hammett, Gregory/0000-0003-1495-6647; Yamada, Masaaki/0000-0003-4996-1649 NR 47 TC 23 Z9 23 U1 1 U2 4 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 MAY PY 1992 VL 21 IS 3 BP 1324 EP 1331 PN 2A PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000004 ER PT J AU KILKENNY, JD BALDIS, HA BATHA, SH CABLE, MD CAMPBELL, EM COOK, RC DARROW, CB DITTRICH, T ELLIS, RJ GLENDINNING, SG HAAN, SW HAMMEL, BA HATCHETT, SP KANIA, DR KAUFFMAN, RL KORNBLUM, HN LANDEN, OL LANE, SM LERCHE, RA LINDL, JD LEVENDAHL, K MONTGOMERY, DS MOODY, J MURPHY, T MUNRO, DH PHILLION, DW REMINGTON, BA RESS, DB SUTER, LJ TIETBOHL, GL THIESSEN, AR TURNER, RE WALLACE, RJ WIEDWALD, JD ZE, F AF KILKENNY, JD BALDIS, HA BATHA, SH CABLE, MD CAMPBELL, EM COOK, RC DARROW, CB DITTRICH, T ELLIS, RJ GLENDINNING, SG HAAN, SW HAMMEL, BA HATCHETT, SP KANIA, DR KAUFFMAN, RL KORNBLUM, HN LANDEN, OL LANE, SM LERCHE, RA LINDL, JD LEVENDAHL, K MONTGOMERY, DS MOODY, J MURPHY, T MUNRO, DH PHILLION, DW REMINGTON, BA RESS, DB SUTER, LJ TIETBOHL, GL THIESSEN, AR TURNER, RE WALLACE, RJ WIEDWALD, JD ZE, F TI RECENT NOVA EXPERIMENTAL RESULTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID SPECTRA AB The Inertial Confinement Fusion (ICF) Program and the Lawrence Livermore National Laboratory has made substantial progress in understanding the details of the radiation drive and the dynamics of capsules imploded by the Nova laser. A detailed understanding, validated by Nova experiments of the crucial physics for implosions is necessary before a new facility is started. A National Academy of Science Review Committee on ICF1 has recently endorsed a 12 point technical contract for the Nova program. Recent experiments have achieved a substantial number of these goals. A decrease in the level of plasma instabilities has been demonstrated by the use of phase plates. Neutron measurements have been used to demonstrate high densities in well understood implosions. A detailed understanding of the Rayleigh-Taylor instability at the ablation front of x-ray driven planar foil targets with large hydrodynamic growth factors has been proven. X-ray spectroscopy has been used to demonstrate a high fuel density and an improvement in the compression ratio of targets when a shaped pulse is used to keep a pusher on a low rho-r trajectory. RP KILKENNY, JD (reprint author), LAWRENCE LIVERMORE NATL LAB,INERTIAL CONFINEMENT FUS PROGRAM,POB 5508,L-473,LIVERMORE,CA 94550, USA. RI Murphy, Thomas/F-3101-2014 OI Murphy, Thomas/0000-0002-6137-9873 NR 13 TC 0 Z9 0 U1 0 U2 4 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 MAY PY 1992 VL 21 IS 3 BP 1340 EP 1343 PN 2A PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000006 ER PT J AU CAMPBELL, EM HOGAN, WJ LOWDERMILK, WH AF CAMPBELL, EM HOGAN, WJ LOWDERMILK, WH TI NOVA UPGRADE MISSION AND DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID LASER-BEAM AB The expeditious demonstration of ignition and gain in a laboratory Inertial Confinement Fusion (ICF) target has been identified by the National Academy of Sciences1 (NAS) and the Fusion Policy Advisory Committee2 (FPAC) as "the highest priority of the ICF Program." Assuming that the near-term NAS-recommended preparatory milestones are met, they also concluded that the proposed Nova Upgrade would be the most expeditious way of achieving that goal. The Nova Upgrade would consist of an advanced, cost effective Nd:glass laser that would deliver 1-2 MJ of 0.35-mu-m light to a target chamber for indirect drive target experiments in which as much as 20 MJ of thermonuclear yield could result. After achieving ignition and gain, further experiments on the facility will allow development of optimized targets for Inertial Fusion Energy (IFE) reactors, simulation of some aspects of ion beam targets, and development of reactor first wall concepts. The targets developed on Nova Upgrade will potentially be suitable for use in an early, low-power engineering test facility (ETF) as the next step in IFE development. RP CAMPBELL, EM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1344 EP 1349 PN 2A PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000007 ER PT J AU COOK, DL AF COOK, DL TI RESULTS FROM PBFA II SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB Recent results from light ion fusion experiments on the Particle Beam Fusion Accelerator (PBFA II) are reported. Intense proton beams have been used to drive two different types of targets. In the thermal source targets, the proton beam heated a low-density foam. The specific power deposition of the proton beam in the foam exceeded 100 TW/gm. In the spherical hydrodynamic targets, the proton beam heated a thin-walled deuterium gas-filled target directly, producing a radial convergence of the deuterium of about 6. In order to increase the specific power deposition in the target, we are developing focused lithium beams. A preformed lithium ion source has been produced using a two-step laser evaporation and ionization approach. This preformed source provides the basis for experiments being planned to reduce the divergence of the lithium beam, a critical step in demonstrating the feasibility of light ion fusion. RP COOK, DL (reprint author), SANDIA NATL LABS,FUS RES DEPT 1260,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 8 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 MAY PY 1992 VL 21 IS 3 BP 1358 EP 1363 PN 2A PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000009 ER PT J AU DOGGETT, JN AF DOGGETT, JN TI STATUS AND PLANS FOR UNITED-STATES ITER STUDIES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE RP DOGGETT, JN (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-641,LIVERMORE,CA 94551, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1367 EP 1369 PN 2A PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000010 ER PT J AU LOUSTEAU, DC HERNDON, JN DAVIS, FC SCHROCK, SL AF LOUSTEAU, DC HERNDON, JN DAVIS, FC SCHROCK, SL TI REMOTE MAINTENANCE CHALLENGES FOR THE INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB During the Conceptual Design Activity (CDA) for the International Thermonuclear Experimental Reactor (ITER), a tokamak reactor design was established that emphasized performance of the individual systems in a minimum overall reactor and building size. The resulting high component density arrangement dictates careful attention to assembly and maintenance (A&M) considerations in the development of the configuration. The A&M task is complicated further because remote maintenance techniques will be required in many areas of ITER after the start of deuterium-tritium operations. During the CDA, the ITER design team addressed many aspects of an overall A&M system. This paper discusses the ITER A&M philosophy that evolved, describes the ITER configuration as it relates to maintenance, and describes the procedures and equipment required for specific maintenance operations. Remote replacement of the in-vessel divertors and blanket/shield modules is discussed in detail. In addition, research and development needs for key enabling technology are addressed. RP LOUSTEAU, DC (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 3 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 MAY PY 1992 VL 21 IS 3 BP 1389 EP 1396 PN 2A PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000014 ER PT J AU HOGAN, JT UCKAN, NA AF HOGAN, JT UCKAN, NA TI MHD STABILITY CONSIDERATIONS FOR THE HIGH ASPECT RATIO DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB Global MHD stability calculations using the PEST code have been carried out as part of the US ITER team's High Aspect Ratio Design (HARD) study. Approximately 15,000 cases have been evaluated both for global and local (ballooning) modes. In addition to aspect ratio variations [2.78 < A < 5], a range of shapes (1.4 < kappa < 2.0, 0. < delta < 0.6) has been examined and the safety factor has been varied: q(0) was varied from 1.05 to 1.85 and q(PSI) from 3.1 to 4.55. For global aspect ratio scaling, these results show no significant increase or decrease in the maximum Troyon parameter, within the level of variation imposed by profile differences: the scaling of the maximum Troyon parameter (g) is found to be independent of A, if optimal values are considered at each aspect ratio. Specific results for the HARD configuration (A = 4.0, kappa = 2.0, delta = 0.4 and q = 3.1, 4) show that the g(required) can be obtained with values of 1i(3) = 0.65 - 0.85 in both the ignition and steady state phases. RP HOGAN, JT (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830, USA. NR 4 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 MAY PY 1992 VL 21 IS 3 BP 1397 EP 1405 PN 2A PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000015 ER PT J AU HOGAN, JT WESLEY, J AF HOGAN, JT WESLEY, J TI SCALING OF DIVERTOR TEMPERATURE AND HEAT LOADS FOR TPX-CLASS DEVICES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB A database of results from the B2 edge transport code has been constructed in order to extract scaling relations for divertor parameters. The device size scale is chosen to be relevant to the US post-TFTR tokamak design considerations, with a nominal plasma radius taken to be equal to that of the DIII-D tokamak for an aspect ratio 2.5 variant, and with correspondingly smaller radii for the A = 4.0 and 5.0 cases considered. Approximately 1500 database entries have been made, using a range of edge boundary conditions (n(e,edge) = 1 to 4.5 10(13) cm-3, T(e'edge) = 50 to 350 eV) and scrape-off layer geometries. Divertor channel length has been varied from approximately 20 cm to approximately 85 cm for A = 2.5, 4 and 5 The results are compared with scaling relations derived from the NET/ITER Team's Harrison-Kukushkin-Hotston global model, and the NET Team's results for a similar B2 database for the ITER Conceptual Design Activity (CDA) parameters. C1 GEN ATOM,SAN DIEGO,CA 92138. RP HOGAN, JT (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,POB 2078,OAK RIDGE,TN 37830, USA. NR 6 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 MAY PY 1992 VL 21 IS 3 BP 1406 EP 1415 PN 2A PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000016 ER PT J AU BARR, WL BULMER, RH PERKINS, LJ COHEN, SA WERLEY, KA AF BARR, WL BULMER, RH PERKINS, LJ COHEN, SA WERLEY, KA TI A COMPARISON OF RESULTS FROM AN EDGE-PLASMA MODEL WITH THOSE FROM A 2-DIMENSIONAL FLUID CODE SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB We have just completed a comparison of predictions for the scrape-off layer (SOL) plasma, from a physics model [1] with the more accurate ones from a two-dimensional fluid code, the B2 code [2]. The results presented here show rather good agreement on values of plasma temperature in the SOL and of divertor heat load, for a rather wide range of Tokamak sizes and parameters. We are therefore confident that this model will provide a suitable divertor module for both the new ITER systems code, SUPERCODE [3], and other applications requiring fast but accurate modelling of edge plasma parameters, at least within the range of the present benchmarks. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. LOS ALAMOS NATL LAB,DIV CONTROLLED THERMONUCL RES,LOS ALAMOS,NM 87545. RP BARR, WL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5511,L-644,LIVERMORE,CA 94550, USA. NR 8 TC 3 Z9 3 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 MAY PY 1992 VL 21 IS 3 BP 1416 EP 1420 PN 2A PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000017 ER PT J AU HOULBERG, WA UCKAN, NA AF HOULBERG, WA UCKAN, NA TI TRANSPORT ANALYSIS OF ITER STARTUP, BURN, AND SHUTDOWN SCENARIOS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID TOKAMAKS; PLASMA; CODE AB Two reference operational scenarios for the ITER CDA design are examined with the time-dependent 1 1/2-D WHIST transport code: the A1 ignition case and the B1 long-pulse case. Plasma profiles are evaluated self-consistently from the source profiles and radial-dependent transport properties. Among the time-dependent issues addressed are the time scales for startup and shutdown as determined by current profile relaxation rates (skin times), fueling and particle pumping rates, and auxiliary heating and current drive sources. Operational constraints are monitored throughout the simulations: beta(t), l(i), n(e)BAR, n(e)(a), etc. RP HOULBERG, WA (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 16 TC 2 Z9 2 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 MAY PY 1992 VL 21 IS 3 BP 1421 EP 1426 PN 2A PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000018 ER PT J AU POST, DE UCKAN, NA AF POST, DE UCKAN, NA TI CRITERIA AND DESIGN TRADE-OFF ISSUES FOR ITER SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB While the determination of the optimum parameters for a tokamak involves the complex trade-off of a large number of engineering and physics constraints, the overall dimensions are actually determined by a relatively simple set of criteria. These criteria are based on the tokamak radial build and elementary physics and engineering requirements, including guidelines for nT-tau(E), the aspect ratio, A = R/a, the edge safety factor, q(psi)95%, the plasma elongation, the size of the neutron shield, and the peak field at the toroidal field coil. Two of these parameters, the aspect ratio and plasma elongation, can be chosen so as to optimize the design parameters and minimize the size and cost of the tokamak. The ITER design point of R approximately 6 m and a approximately 2 m follows from these constraints and the parameter choices for aspect ratio and elongation. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP POST, DE (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Post, Douglass/L-3773-2014 OI Post, Douglass/0000-0001-9271-0023 NR 9 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 MAY PY 1992 VL 21 IS 3 BP 1427 EP 1433 PN 2A PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000019 ER PT J AU POST, DE COHEN, SA HOGAN, J NEVINS, WM RUTHERFORD, PH SIGMAR, D STOTLER, D UCKAN, NA WESLEY, JC AF POST, DE COHEN, SA HOGAN, J NEVINS, WM RUTHERFORD, PH SIGMAR, D STOTLER, D UCKAN, NA WESLEY, JC TI ASSESSMENT OF THE ADEQUACY OF THE ITER ENGINEERING DESIGN ACTIVITY PHYSICS RESEARCH-AND-DEVELOPMENT PROGRAM SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB We have assessed the capability of the international fusion program to provide the physics data needed to support a decision to proceed with the construction of ITER in 1996-1997. We conclude that the international fusion program has the capability to provide the data, but that additional emphasis is needed in two areas, power and particle control and disruptions, for the required data to be available by 1996. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. GEN ATOM INC,SAN DIEGO,CA 92121. MIT,CAMBRIDGE,MA 02139. RP POST, DE (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Post, Douglass/L-3773-2014; Stotler, Daren/J-9494-2015 OI Post, Douglass/0000-0001-9271-0023; Stotler, Daren/0000-0001-5521-8718 NR 2 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1434 EP 1443 PN 2A PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000020 ER PT J AU UCKAN, NA AF UCKAN, NA TI ITER PHYSICS RESEARCH-AND-DEVELOPMENT ASSESSMENT FOR CONFINEMENT AND PLASMA PERFORMANCE PROJECTIONS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB The ranges of confinement-relevant (dimensional and dimensionless) plasma parameters for major tokamaks (JET, JT-6OU, TFTR, DIII-D, ...) that are expected to contribute to the ITER Physics R & D in the 1990s have been analyzed to characterize confinement and plasma performance in ITER-like designs. We find that the largest tokamaks (JET, JT-6OU) should be able to demonstrate H-mode operation (with ELMs, as in ITER) with n-tau(E)T(i) values within an order of magnitude of those required in ITER and have relevant dimensionless plasma parameters (rho/a, nu*, etc.) within a factor 2 of those in ITER. Extrapolations from dimensionally similar discharges in DIII-D and JET show high-Q/ignition operation in ITER-like plasmas at plasma currents (approximately 16 MA) well below the nominal (22-MA) design value. Another critical issue for achieving ignition-level plasma performance is the anomalous alpha particle effects, mainly the "toroidal Alfven eigenmode" (TAE mode). The D-T experiments in TFTR and JET (and simulations using fast beam ions) should realize alpha particle (fast-ion) parameters roughly similar, in relation to TAE mode thresholds, to those projected for ITER. We judge that present-day tokamaks will provide a sufficient database (by the mid-1990s) on H-mode confinement (with ELMs) and possible anomalous alpha particle effects at relevant dimensionless parameters that are expected to be adequate for ITER purposes. RP UCKAN, NA (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1444 EP 1448 PN 2A PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000021 ER PT J AU CRANDALL, DH AF CRANDALL, DH TI CONCLUSIONS AND DIRECTIONS FROM THE OFE INERTIAL FUSION-REACTOR STUDIES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB Two industry-led teams have each completed new Inertial Fusion Energy (IFE) reactor studies under contract from the Office of Fusion Energy (OFE). Each team studied both a heavy-ion-indirect-driven and a KrF-laser-direct-driven reactor for electrical energy production. The reactor concepts, that will be described in other papers at this conference, are attractive and contain innovative approaches that would require development programs to implement. The "believability" of the reactor concepts could be an important issue in determining the level and nature of an IFE development program pursued by OFE. The performance of radiation-compressed fusion targets (gain curves), the required features of the drivers, the systems for delivery of targets and driver energy to the reactor chamber, and the systems for conversion of thermonuclear energy to electricity are all complex and subject to issues of technical credibility and feasibility. This paper will discuss the studies and the directions suggested by them. No strong conclusions will be drawn; the assessment of these studies and the meaning of such assessment for energy development is just beginning here. RP CRANDALL, DH (reprint author), US DOE,ENERGY RES,OFF FUS ENERGY,DIV APPL PLASMA PHYS,WASHINGTON,DC 20585, USA. NR 24 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 MAY PY 1992 VL 21 IS 3 BP 1451 EP 1459 PN 2A PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000022 ER PT J AU MOIR, RW AF MOIR, RW TI HYLIFE-II INERTIAL FUSION ENERGY POWER-PLANT DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB The HYLIFE-II inertial fusion power plant design study uses a liquid fall, in the form of jets, to protect the first structural wall from neutron damage, x rays, and blast to provide a 30-y lifetime. HYLIFE-I used liquid lithium. HYLIFE-II avoids the fire hazard of lithium by using a molten salt composed of fluorine, lithium, and beryllium (Li2BeF4) called Flibe. Access for heavy-ion beams is provided. Calculations for assumed heavy-ion beam performance show a nominal gain of 70 at 5 MJ producing 350 MJ, about 5.2 times less yield than the 1.8 GJ from a driver energy of 4.5 MJ with gain of 400 for HYLIFE-I. The nominal 1 GWe of power can be maintained by increasing the repetition rate by a factor of about 5.2, from 1.5 to 8 Hz. A higher repetition rate requires faster re-establishment of the jets after a shot, which can be accomplished in part by decreasing the jet fall height and increasing the jet flow velocity. In addition, although not adequately considered for HYLIFE-I, there is liquid splash that must be forcibly cleared because gravity is too slow, at higher repetition rates than 1 Hz. Splash removal is accomplished in the central region by oscillating jet flows. The cost of electricity is estimated to be 0.09 $/kW.h in constant 1988 dollars, about twice that of future coal and light water reactor nuclear power. The driver beam cost is about one-half the total cost, that is, a zero cost driver would give a calculated cost of electricity of 0.045 $/kWh. RP MOIR, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-644,LIVERMORE,CA 94550, USA. NR 25 TC 15 Z9 15 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 MAY PY 1992 VL 21 IS 3 BP 1475 EP 1486 PN 2A PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000026 ER PT J AU HOUSE, PA AF HOUSE, PA TI HYLIFE-II REACTOR CHAMBER MECHANICAL DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB Mechanical design features of the reactor chamber for the HYLIFE-II inertial confinement fusion power plant are presented. A combination of oscillating and steady, molten salt streams are used for shielding and blast protection. The system is designed for an 8 Hz repetition rate. Beam path clearing, between shots, is accomplished with the oscillating flow. The mechanism for generating the oscillating streams is described. A design configuration of the vessel wall allows adequate cooling and provides extra shielding to reduce thermal stresses to tolerable levels. The bottom portion of the reactor chamber is designed to minimize splash back of the high velocity (20 m/s) salt streams and also recover up to half of the dynamic head. RP HOUSE, PA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-644,LIVERMORE,CA 94550, USA. NR 2 TC 18 Z9 18 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 MAY PY 1992 VL 21 IS 3 BP 1487 EP 1491 PN 2A PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000027 ER PT J AU MOIR, RW HAMMER, JH HARTMAN, CW LEBER, RL LOGAN, BG PETZOLDT, RW TABAK, M TOBIN, MT BIERI, RL HOFFMAN, MA AF MOIR, RW HAMMER, JH HARTMAN, CW LEBER, RL LOGAN, BG PETZOLDT, RW TABAK, M TOBIN, MT BIERI, RL HOFFMAN, MA TI INERTIAL FUSION ENERGY POWER-PLANT DESIGN USING THE COMPACT TORUS ACCELERATOR - HYLIFE-CT SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID CONFINEMENT FUSION AB The Compact Torus Accelerator (CTA), under development at Lawrence Livermore National Laboratory, offers the promise of a low-cost, high-efficiency, high-energy, high-power-density driver for ICF and MICF (Magnetically Insulated ICF) type fusion systems. A CTA with 100 MJ driver capacitor bank energy is predicted to deliver approximately 30 MJ CT kinetic energy to a 1 cm2 target in several nanoseconds for a power density of approximately 10(16) watts/cm2. The estimated cost of delivered energy is approximately 3$/Joule, or $100M for 30 MJ. This driver appears to be cost-effective and, in this regard, is virtually alone among IFE drivers. We discuss indirect-drive ICF with a DT fusion energy gain Q = 70 for a total yield of 2 GJ. The CT can be guided to the target inside a several-meter-long disposable cone made of frozen Li2BeF4, the same material as the coolant. We have designed a power plant including CT injection, target emplacement, containment, energy recovery, and tritium breeding. The cost of electricity is predicted to be 4.8 [/kWh, which is competitive with future coal and nuclear costs. C1 WJ SCHAFER ASSOC INC,PLEASANTON,CA 94566. UNIV CALIF DAVIS,DEPT MECH ENGN,DAVIS,CA 95616. RP MOIR, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-644,LIVERMORE,CA 94550, USA. NR 16 TC 4 Z9 4 U1 2 U2 3 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 MAY PY 1992 VL 21 IS 3 BP 1492 EP 1500 PN 2A PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000028 ER PT J AU ROVANG, DC AF ROVANG, DC TI ADVANCES IN THE ENGINEERING OF HIGH-FIELD APPLIED-B ION DIODES FOR INERTIAL CONFINEMENT FUSION SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB Pulsed high field magnet coils are an integral part of the applied-B ion diode used in the light ion Inertial Confinement Fusion program at Sandia National Laboratories. Several factors have contributed in recent years to the need for higher magnetic fields of these applied-B ion diodes. These increased magnetic field requirements have precipitated the development of better engineering tools and techniques for use in the design of applied-B ion diodes. This paper describes the status of the applied-B ion diode engineering at Sandia. The design process and considerations are discussed. A systematic approach for maximizing the field achievable from a particular coil system consisting of the capacitor bank, the feeds, and the coil is presented. A coupled electromechanical finite element analysis is also described. RP ROVANG, DC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 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 MAY PY 1992 VL 21 IS 3 BP 1571 EP 1577 PN 2A PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000040 ER PT J AU NADLER, JH MILEY, GH GU, Y HOCHBERG, T AF NADLER, JH MILEY, GH GU, Y HOCHBERG, T TI CHARACTERIZATION OF AN INERTIAL-ELECTROSTATIC CONFINEMENT GLOW-DISCHARGE (IECGD) NEUTRON GENERATOR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB There is considerable demand in the scientific community for a neutron generator with an output of 10(5)-10(6) n/s that can be turned on or off, emits fusion neutrons, is self-calibrating, and can offer portable operation [1,2]. This paper will describe how an IEC-based neutron generator could satisfy these demands. Experimental data and modeling is presented for operation to the 10(5) n/s range. Direct extrapolation of the results indicate that with modest extension of operating parameters operation can be achieved in the 10(6)-10(7) n/s range; with more aggressive modifications operation in the 10(8-10) n/s range can be possible. C1 UNIV ILLINOIS,FUS STUDIES LAB,URBANA,IL 61801. RP NADLER, JH (reprint author), US DOE,IDAHO FIELD OFF,785 DOE PL,M-S 1220,IDAHO FALLS,ID 83401, USA. NR 11 TC 16 Z9 16 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 MAY PY 1992 VL 21 IS 3 BP 1639 EP 1643 PN 2A PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000052 ER PT J AU STEVENSON, T SILBER, K LAGIN, L NEWMAN, R VONHALLE, A WILLIAMS, MD AF STEVENSON, T SILBER, K LAGIN, L NEWMAN, R VONHALLE, A WILLIAMS, MD TI THE TFTR NEUTRAL BEAM PERFORMANCE DATABASE SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB The Tokamak Fusion Test Reactor (TFTR) Neutral Beam Injection System has been in operation since 1984, providing neutral beam heating to TFTR experiments. A database development effort has resulted in a comprehensive system capable of a variety of applications. The NB database stores information extracted from programs which provide operator feedback in the NB software event cycle. A powerful and flexible interactive plotting program is available to display results. A shot logger provides the global ability to set a flag in the performance database to describe the basic quality of the shot. RP STEVENSON, T (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1644 EP 1647 PN 2A PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000053 ER PT J AU BARNES, GW PERSING, R SCHMIDT, G GOUGE, M BAYLOR, L COLE, M COMBS, S FEHLING, D FISHER, PW FOUST, C MILORA, S QUALLS, L AF BARNES, GW PERSING, R SCHMIDT, G GOUGE, M BAYLOR, L COLE, M COMBS, S FEHLING, D FISHER, PW FOUST, C MILORA, S QUALLS, L TI THE TFTR TRITIUM PELLET INJECTION FACILITY MECHANICAL DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB The Tritium Pellet Injector (TPI) is a cryogenic pellet injector which will be used on TFTR prior to and during the D-T phase of operations. The injector will replace the current Deuterium Pellet Injector (DPI) at Bay T with an injection capability for pellets of deuterium and/or tritium or mixtures of both. The gun will be a 4 barrel configuration (replacing the existing 8 barrel system) with one of the barrels capable of high speed. Pellet acceleration will be accomplished pneumatically using high pressure helium and hydrogen gas. The injector has one cylindrical pellet per barrel per shot with each barrel independent of the others. Velocity of the pellets when they are injected into the plasma for the single stage gun will be 1.5 km/sec which is variable from .5 to 1.5 km/sec. For the Two-Stage gun velocities will be 3.0 km/sec. The TPI program is a collaborative effort between Oak Ridge National Laboratories and Princeton Plasma Physics Lab. The TPI program provides a cryogenic tritium pellet injection capability by the Spring of 1993. The project is divided into 2 Phases. Phase 1 which supports deuterium operation and Phase 2 which supports tritium operation. Phase 1 is scheduled for implementation during the Spring of 92 with deuterium operation from April through September of 1992. A very important part of Phase 1 is to verify that the systems required for Phase 2 that are operational will be tested as part of the deuterium effort. Phase 2 is scheduled for implementation and will make the TPI tritium capable by the end of April 1993. ORNAL responsibilities include assembly and design of the injector line, development of the injector control system and modification of the gas manifolds. PPPL'S tasks is the system engineering and interface of supporting systems for the operation of the injector during deuterium and also during the tritium phase of operations. This paper will address the mechanical design of the TPI injection facility provided by PPPL with the TFTR machine. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BARNES, GW (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1662 EP 1664 PN 2A PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000057 ER PT J AU GOUGE, MJ BAYLOR, LR COLE, MJ COMBS, SK DYER, GR FEHLING, DT FISHER, PW FOUST, CR LANGLEY, RA MILORA, SL QUALLS, AL WILGEN, JB SCHMIDT, GL BARNES, GW PERSING, RG AF GOUGE, MJ BAYLOR, LR COLE, MJ COMBS, SK DYER, GR FEHLING, DT FISHER, PW FOUST, CR LANGLEY, RA MILORA, SL QUALLS, AL WILGEN, JB SCHMIDT, GL BARNES, GW PERSING, RG TI TRITIUM PELLET INJECTOR FOR TFTR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID PLASMA FUELING APPLICATIONS; LIGHT GAS GUN; HIGH SPEEDS; ACCELERATION AB The tritium pellet injector (TPI) for the Tokamak Fusion Test Reactor (TFTR) will provide a tritium pellet fueling capability with pellet speeds in the 1- to 3- km/s range for the TFTR deuterium-tritium (D-T) phase. The existing TFTR deuterium pellet injector (DPI) has been modified at Oak Ridge National Laboratory (ORNL) to provide a four-shot, tritium-compatible, pipe-gun configuration with three upgraded single-stage pneumatic guns and a two-stage light gas gun driver. The TPI was designed to provide pellets ranging from 3.3 to 4.5 mm in diameter in arbitrarily programmable firing sequences at speeds up to approximately 1.5 km/s for the three single-stage drivers and 2.5 to 3 km/s for the two-stage driver. Injector operation is controlled by a programmable logic controller. The new pipe-gun injector assembly was installed in the modified DPI guard vacuum box, and modifications were made to the internals of the DPI vacuum injection line, including a new pellet diagnostics package. Assembly of these modified parts with existing DPI components was then completed, and the TPI was tested at ORNL with deuterium pellets. Results of the limited testing program at ORNL are described. The TPI is being installed on TFTR to support the D-D run period in 1992. In 1993, the tritium pellet injector will be retrofitted with a D-T fuel manifold and secondary tritium containment systems and integrated into TFTR tritium processing systems to provide full tritium pellet capability. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP GOUGE, MJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 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 MAY PY 1992 VL 21 IS 3 BP 1665 EP 1671 PN 2A PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000058 ER PT J AU WRIGHT, KE OLDAKER, ME PINTER, GR AF WRIGHT, KE OLDAKER, ME PINTER, GR TI PRE-OPERATIONAL TEST-RESULTS OF THE TFTR NEUTRAL BEAM D-T GAS DELIVERY SYSTEM SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID 120-KV AB A new gas delivery system is being designed to inject either tritium or deuterium gas with uniform throughput for up to 6 seconds into the TFTR Neutral Beam Long Pulse Ion Sources. Several experiments have been conducted to verify design concepts and qualify components. Piezoelectric valves were characterized for hydrogen and deuterium gas and the data used to predict operation with tritium. The uniformity of the gas throughput was studied as a function of test fluid, flowrate and initial plenum pressure. Various passive techniques to mitigate unacceptable thermal effects were tested. The uniformity of the throughput with an active pressure feedback controller was tested under various operational scenarios. The functionality of a prototypical NB D-T Gas Delivery System has been analyzed. This paper presents the results of these pre-operational tests. RP WRIGHT, KE (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, 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 MAY PY 1992 VL 21 IS 3 BP 1672 EP 1677 PN 2A PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000059 ER PT J AU NAJMABADI, F CONN, RW BATHKE, CG BAXI, CB BROMBERG, L BROOKS, J CHENG, ET DAVIS, F EHST, DA ELGUEBALY, LA EMMERT, GA DOLAN, TJ HASAN, MZ HASSANEIN, A HERRING, JS HOLMES, JA HUA, T HULL, A JARDIN, SC KESSEL, C KHATER, HY KRAKOWSKI, RA LEUER, JA LOUSTEAU, DC MATTIS, R MAU, TK MCQUILLAN, BW PICOLOGLOU, B PUHN, FA SANTARIUS, JF SAWAN, M SCHULTZ, J SCHULTZ, KR SHARAFAT, S SNEAD, L STEINER, D STRICKLER, DJ SVIATOSLAVSKY, IN SZE, DK VALENTI, M WERLEY, KA WONG, CPC AF NAJMABADI, F CONN, RW BATHKE, CG BAXI, CB BROMBERG, L BROOKS, J CHENG, ET DAVIS, F EHST, DA ELGUEBALY, LA EMMERT, GA DOLAN, TJ HASAN, MZ HASSANEIN, A HERRING, JS HOLMES, JA HUA, T HULL, A JARDIN, SC KESSEL, C KHATER, HY KRAKOWSKI, RA LEUER, JA LOUSTEAU, DC MATTIS, R MAU, TK MCQUILLAN, BW PICOLOGLOU, B PUHN, FA SANTARIUS, JF SAWAN, M SCHULTZ, J SCHULTZ, KR SHARAFAT, S SNEAD, L STEINER, D STRICKLER, DJ SVIATOSLAVSKY, IN SZE, DK VALENTI, M WERLEY, KA WONG, CPC TI THE ARIES-II AND ARIES-IV 2ND-STABILITY TOKAMAK REACTORS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE ID BALLOONING MODES; STABILITY AB The ARIES research program is a multi-institutional effort to develop several visions of tokamak reactors with enhanced economic, safety, and environmental features. Four ARIES visions are currently planned for the ARIES program. The ARIES-I design is a DT-burning reactor based on "modest" extrapolations from the present tokamak physics database and relies on either existing technology or technology for which trends are already in place, often in programs outside fusion. The ARIES-III study focuses on the potential of tokamaks to operate with D He-3 fuel system as an alternative to deuterium and tritium. Two major cost items in the ARIES-I reactor are those associated with the magnet system and the current-drive system and recirculating power. Theoretical studies of the second MHD stability regime has been on-going in order to increase the toroidal beta (reduce the magnet cost) as compared to the first-stability regime. Recent analyses indicate that because second MHD stable plasmas have a high poloidal beta, the bootstrap current is high and can exceed the equilibrium plasma current. Therefore, the ARIES-II/-IV activity, therefore, has focused on second-stability equilibria in which approximately 100% of plasma current is produced by the bootstrap current. These equilibria have only moderate toroidal beta (approximately 4% to 6%) but the current-drive power (and cost) is small. Parametric system studies have confirmed that by operating in the second-stability regime with the constraint of approximately 100% bootstrap current, the COE of ARIES-II and ARIES-IV designs are approximately 25% lower than that of ARIES-I. The ARIES-II and ARIES-IV designs have the same fusion plasma but different fusion-power-core designs. The ARIES-II reactor uses liquid lithium as the coolant and tritium breeder and vanadium alloy as the structural material in order to study the potential of low-activation metallic blankets. The ARIES-IV reactor uses helium as the coolant, a solid tritium-breeding material, and silicon carbide composite as the structural material in order to achieve the safety and environmental characteristic of fusion. In this paper we describe the trade-off leading to the optimum regime of operation for the ARIES-II and ARIES-IV second-stability reactors and review the engineering design of the fusion power cores. C1 TSI RES,SOLANA BEACH,CA. ARGONNE NATL LAB,ARGONNE,IL 60439. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. GEN ATOM,SAN DIEGO,CA. IDAHO NATL ENGN LAB,IDAHO FALLS,ID. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RENSSELAER POLYTECH INST,TROY,NY 12181. UNIV WISCONSIN,MADISON,WI 53706. MIT,CAMBRIDGE,MA 02139. RP NAJMABADI, F (reprint author), UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024, USA. RI Jardin, Stephen/E-9392-2010 NR 29 TC 21 Z9 21 U1 2 U2 2 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 MAY PY 1992 VL 21 IS 3 BP 1721 EP 1728 PN 2A PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000067 ER PT J AU PENG, YKM GALAMBOS, JD SHIPE, PC AF PENG, YKM GALAMBOS, JD SHIPE, PC TI SMALL TOKAMAKS FOR FUSION TECHNOLOGY TESTING SO FUSION TECHNOLOGY LA English DT Article ID TORUS AB Small steady-state tokamaks for testing divertors and fusion nuclear technologies are considered. Based on present physics and technology data and extrapolation to reduced R0/a, H-D-fueled tokamaks with R0 approximately 0.6-0.75 m, R0/a approximately 1.8-2.5, and B(t0) approximately 1.4-2.2 T can be driven with P(tot) approximately 4.5 MW to maintain I(p) approximately 0.5 MA and produce the ITER-level plasma edge and divertor conditions. Given an adequate steady-state divertor solution and Q approximately 1 operation based on fusion through the suprathermal component, D-T-fueled tokamaks with R0 approximately 0.8 m, R0/a approximately 2, and B(t0) approximately 4 T can be driven with P(tot) approximately 15 MW to maintain I(p) approximately 4.6 MA and produce a peak neutron wall load W(L) approximately 1 MW/m2. Such devices appear possible if the plasma properties at the lower R0/a remain tokamak-like and, for the D-T case, an unshielded center core is feasible. The use of a single conductor as the inboard leg of the toroidal field coils for this purpose is discussed. The physics issues and the design features are identified for such tokamaks with a testing duty factor goal of 10-20%. RP PENG, YKM (reprint author), OAK RIDGE NATL LAB, MARTIN MARIETTA ENERGY SYST INC, POB 2009, OAK RIDGE, TN 37831 USA. NR 45 TC 25 Z9 25 U1 0 U2 1 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1729 EP 1738 PN 2A PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000068 ER PT J AU HANEY, SW BARR, WL CROTINGER, JA PERKINS, LJ SOLOMON, CJ CHANIOTAKIS, EA FREIDBERG, JP WEI, J GALAMBOS, JD MANDREKAS, J AF HANEY, SW BARR, WL CROTINGER, JA PERKINS, LJ SOLOMON, CJ CHANIOTAKIS, EA FREIDBERG, JP WEI, J GALAMBOS, JD MANDREKAS, J TI A SUPERCODE FOR SYSTEMS-ANALYSIS OF TOKAMAK EXPERIMENTS AND REACTORS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB A new code, named SUPERCODE, has been developed to fill the gap between currently available zero dimensional systems codes and highly sophisticated, multidimensional plasma performance codes. The former are comprehensive in content, fast to execute, but rather simple in terms of the accuracy of their physics and engineering models. The latter contain state-of-the-art plasma physics modeling but are limited in engineering content and are time consuming to run. The SUPERCODE upgrades the reliability and accuracy of systems codes by calculating the self consistent 1 1/2-D plasma evolution in a realistic engineering environment. By a combination of variational techniques and careful formulation there is only a modest increase in CPU time over 0-D runs, thereby making the SUPERCODE suitable for use as a systems studies tool. In addition, we have expended considerable effort to make the code user- and programmer-friendly, as well as operationally flexible, with the hope of encouraging wide usage throughout the fusion community. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,CTR FUS ENGN DESIGN,OAK RIDGE,TN 37831. GEORGIA INST TECHNOL,ATLANTA,GA 30332. RP HANEY, SW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5511,L-644,LIVERMORE,CA 94550, USA. NR 17 TC 32 Z9 32 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 MAY PY 1992 VL 21 IS 3 BP 1749 EP 1758 PN 2A PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000071 ER PT J AU GALAMBOS, J BAKER, C PENG, YKM COHN, D CHANIOTAKIS, M BROMBERG, L DEAN, SO AF GALAMBOS, J BAKER, C PENG, YKM COHN, D CHANIOTAKIS, M BROMBERG, L DEAN, SO TI SYSTEM STUDIES OF COPPERCONDUCTING-COIL AND SUPERCONDUCTING-COIL PILOT PLANTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY CY JUN 07-12, 1992 CL BOSTON, MA SP AMER NUCL SOC, FUS ENERGY DIV, AMER NUCL SOC, MAT SCI & TECHNOL DIV, US DOE AB The TETRA systems code is used to examine devices with both normal copper and superconducting coils as vehicles for steady-state production of fusion power in a Pilot Plant. If the constraints of plasma ignition and net electrical power production are dropped, such devices are much smaller and less expensive than ITER-like devices. For wall loads near 0.5 MW/m2 with nominal ITER physics guidelines, devices with copper coils have major radii R near 2 m and direct costs near 1 x 10(9) $, while devices with superconducting coils have R = 4.1 m and costs of 2.4 x 10(9) $. However, the copper-coil devices have the burden of hundreds of megawatts of resistive power losses. All cases tend towards high aspect ratio (A > 4), high fields, and low current. The situation improves for the superconducting-coil cases if higher beta limits are permissible, whereas the copper-coil cases see less benefit from higher beta limits. C1 FUS POWER ASSOCIATES,GAITHERSBURG,MD 20879. MIT,CAMBRIDGE,MA 02139. RP GALAMBOS, J (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 5 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 MAY PY 1992 VL 21 IS 3 BP 1759 EP 1764 PN 2A PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000072 ER PT J AU LOGAN, BG AF LOGAN, BG TI LOW-COST, HIGH-YIELD IFE REACTORS - REVISITING VELIKHOV VAPORIZING BLANKETS SO FUSION TECHNOLOGY LA English DT Article AB The performance (efficiency and cost) of IFE reactors using MHD conversion is explored for target blanket shells of various materials vaporized and ionized by high fusion yields (5 to 500 GJ). A magnetized, prestressed reactor chamber concept is modeled together with previously developed models for the Compact Fusion Advanced Rankine II (CFARII) MHD Balance-of-Plant (BoP). Using conservative 1-D neutronics models, high fusion yields (20 to 80 GJ) are found necessary to heat Flibe, lithium, and lead-lithium blankets to MHD plasma temperatures, at initial solid thicknesses sufficient to capture most of the fusion yield. Advanced drivers/targets would need to be developed to achieve a "Bang per Buck" figure-of-merit greater-than-or-similar-to 20 to 40 joules yield per driver $ for this scheme to be competitive with these blanket materials. Alternatively, more realistic neutronics models and better materials such as lithium hydride may lower the minimum required yields substantially. The very low CFARII BoP costs (contributing only 3 mills/kWehr to CoE) allows this type of reactor, given sufficient advances that non-driver costs dominate, to ultimately produce electricity at a much lower cost than any current nuclear plant. RP LOGAN, BG (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5511,L-640,LIVERMORE,CA 94551, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1784 EP 1793 PN 2B PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200003 ER PT J AU MCGRATH, RT RUSSO, AJ CAMPBELL, RB WATSON, RD AF MCGRATH, RT RUSSO, AJ CAMPBELL, RB WATSON, RD TI PLASMA FACING COMPONENT DEVELOPMENT - BOUNDARY-LAYER PHYSICS AND COMPONENT ENGINEERING SO FUSION TECHNOLOGY LA English DT Article ID EROSION AB Tokamaks currently in operation deposit on the order of 1-30 MW/m2 onto plasma facing surfaces during normal operation and hundreds of MW/m2 for shorter periods of time (0.1-3 ms) during disruptions. Disruption deposited energies on future high-power tokamaks may be well in excess of 20 MJ/m2 Design of plasma facing components (PFCs) for such severe environments requires considerable advancements in materials development, armor tile bonding to actively cooled substrates, heat transfer, and many other areas of engineering concern. Considerable improvements in PFC performance, reliability and lifetime can also be accomplished through improved understanding and control of the edge plasma boundary layer. This paper covers both engineering and edge plasma physics issues that must be addressed in the development of reliable PFCs for ITER. Several specific examples are addressed since a complete treatment of all critical development issues would be lengthy. Topics covered include impurity generation and transport in the boundary layer plasma, materials response to intense pulsed disruption heat loads, runaway electron generation during disruptions, high heat flux performance and PFC fabrication issues. These topics are illustrative examples of the variety of complex issues that must be addressed in the development and design of PFCs. RP MCGRATH, RT (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 38 TC 3 Z9 3 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 MAY PY 1992 VL 21 IS 3 BP 1805 EP 1816 PN 2B PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200005 ER PT J AU ULRICKSON, M BARNES, G FAN, HM LABIK, G LOESSER, D LONTAI, L OWENS, DK AF ULRICKSON, M BARNES, G FAN, HM LABIK, G LOESSER, D LONTAI, L OWENS, DK TI EXPERIENCE WITH CARBON-FIBER COMPOSITE LIMITER TILES ON TFTR SO FUSION TECHNOLOGY LA English DT Article AB Carbon fiber composite (CFC) materials have been used as the plasma facing surface on limiters in TFTR since 1989. We changed from all POCO graphite tiles on the inner bumper limiter (BL) to about 1/3 CFC tiles in the high heat flux area because of tile failures with heating powers up to 20 MW. The RF limiters (RFL), which were designed to protect the radio-frequency antennas from plasma heat flux, were designed with CFC material. This paper discusses the design issues related to the CFC materials, our experience with material property variations in large production runs, and our operational experience with CFC limiters. The replacement BL tiles were made from a 3D CFC material. The RFL tiles were made from a 2D CFC. The use of 2D CFC material was molded to near net shape. The tiles were required to withstand up to 10(5) cycles of 50 MW of heating power for a duration of 2 s. Determination of the minimum material properties was one of the major design issues. The fabrication of the BL tiles required production of about 35 large billets of 3D CFC material. The fabrication of the RFL tiles required production of about 160 tile blanks. We found substantial variation in the material properties of the finished parts. The distribution of the material property data is discussed. In the case of the RFL tiles some parts did not meet the required properties because of the non-standard nature of the fabrication. After nearly two years of operation on the CFC tiles, none of the CFC tiles have failed. The only damage observed on the CFC tiles is a slight darkening of the tile when it is heated to the sublimation point by the disruption heat loads. Recommendations of the best design and fabrication strategies for CFC plasma facing components are made. RP ULRICKSON, M (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 13 TC 0 Z9 0 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1817 EP 1822 PN 2B PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200006 ER PT J AU YUGO, JJ WILLIAMSON, DE AF YUGO, JJ WILLIAMSON, DE TI A COMPARISON OF 2 3-DIMENSIONAL SHELL-ELEMENT TRANSIENT ELECTROMAGNETICS CODES SO FUSION TECHNOLOGY LA English DT Article AB Electromagnetic forces due to eddy currents strongly influence the design of components for the next generation of fusion devices. An effort has been made to benchmark two computer programs used to generate transient electromagnetic loads: SPARK and EddyCuFF. Two simple transient field problems were analyzed, both of which had been previously analyzed by the SPARK code with results recorded in the literature. A third problem that uses an ITER inboard blanket benchmark model was analyzed as well. This problem was driven with a self-consistent, distributed multifilament plasma model generated by an axisymmetric physics code. The benchmark problems showed good agreement between the two shell-element codes. Variations in calculated eddy currents of 1-3% have been found for similar, finely meshed models. A difference of 8% was found in induced current and 20% in force for a coarse mesh and complex, multifilament field driver. Because comparisons were made to results obtained from literature, model preparation and code execution times were not evaluated. C1 MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE,TN 37831. RP YUGO, JJ (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1909 EP 1913 PN 2B PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200022 ER PT J AU YEAW, CT WONG, RL AF YEAW, CT WONG, RL TI NUMERICAL-SIMULATION OF THE STABILITY IN LONG CABLE-IN-CONDUIT CONDUCTORS FOR FUSION MAGNETS SO FUSION TECHNOLOGY LA English DT Article AB The stability phenomenon is investigated numerically for a quench initiating in a cable-inconduit conductor (CICC) at a significant distance from the ends. The thermo-hydraulic computer program, CICC, was used. The geometry chosen for this study is a toroidal field (TF) coil for the conceptual design activity (CDA) of the International Thermonuclear Experimental Reactor (ITER). Previous studies of short conductors have shown that convective helium flows, induced by the initiating heat pulse, control the stability of the conductor. The present study of a long conductor exhibits reduced energy margins and the absence of a transition region between the well-cooled and ill-cooled stability regions because the initiating heat pulse has difficulty sustaining a convective flow. The effect of heat-pulse duration and heated length were considered. For short, high-energy heat pulses, high convective and conductive heat-transfer coefficients can only be maintained for 10 ms. If the heat-pulse energy is spread over 100 ms, the steady-state heat-transfer coefficient is sufficient to stabilize the conductor. Pulse durations between 10 and 100 ms cause a decrease in energy margin. On the other hand, the conductor length heated was found to have only a small effect on stability. C1 UNIV CALIFORNIA LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP YEAW, CT (reprint author), UNIV WISCONSIN,1500 JOHNSON DR,MADISON,WI 53706, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1914 EP 1917 PN 2B PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200023 ER PT J AU DOLAN, TJ LONGHURST, GR GARCIAOTERO, E AF DOLAN, TJ LONGHURST, GR GARCIAOTERO, E TI A VACUUM DISENGAGER FOR TRITIUM REMOVAL FROM HYLIFE-II REACTOR FLIBE SO FUSION TECHNOLOGY LA English DT Article AB We have designed a vacuum disengager system to remove tritium from the Flibe (Li2BeF4) molten salt coolant of the HYLIFE-II fusion reactor. There is a two-stage vacuum disengager in each of three intermediate heat exchanger (IHX) loops. Each stage consists of a vacuum chamber 4 m in diameter and 7 m tall. As 0.2 mm diameter molten salt droplets fall vertically downward into the vacuum, most of the tritium diffuses out of the droplets and is pumped away. A fraction PHI almost-equal-to 10(-5) of the 8.6 MCi/day tritium source (from breeding in the Flibe and from unburned fuel) remains in the Flibe as it leaves the vacuum disengagers, and about 21 % of that permeates into the intermediate coolant loop, so about 20 Ci/day leak into the steam system. With Flibe primary coolant and a vacuum disengager, it appears that an intermediate coolant loop is not needed to prevent tritium from leaking into the steam system. An experiment is needed to demonstrate Flibe vacuum disengager operation. C1 UNIV MISSOURI,DEPT NUCL ENGN,COLUMBIA,MO 65211. RP DOLAN, TJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 14 TC 7 Z9 7 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1949 EP 1954 PN 2B PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200029 ER PT J AU CHRZANOWSKI, JH LAMARCHE, P LADD, P AF CHRZANOWSKI, JH LAMARCHE, P LADD, P TI TRITIUM GAS INJECTION SYSTEM FOR TFTR D-T OPERATIONS SO FUSION TECHNOLOGY LA English DT Article AB PPPL is presently preparing TFTR for D-T operation beginning the summer of 1993. Included in this preparation is the design and installation of a Tritium Gas Delivery and Injection System which will supply tritium to the TFTR vacuum vessel. The Gas Delivery System will be required to deliver the tritium gas from the Tritium Vault which is located in the TFTR basement to various components located on the TFTR device located in the Test Cell. These components include three Tritium Gas Injection Assemblies (TGIA); twelve Tritium Neutral Beam Injectors (TNB); and the Tritium Pellet Injector (TPI). The Tritium Gas Delivery System which will be described in this paper will include a double walled supply manifold plus the TGIA's. RP CHRZANOWSKI, JH (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08544, USA. NR 3 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 MAY PY 1992 VL 21 IS 3 BP 1955 EP 1958 PN 2B PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200030 ER PT J AU BARNES, J DUERRE, K ANDERSON, J BARTLIT, J PARKINSON, W SHERMAN, R HAYASHI, T NARUSE, Y AF BARNES, J DUERRE, K ANDERSON, J BARTLIT, J PARKINSON, W SHERMAN, R HAYASHI, T NARUSE, Y TI KNOWLEDGE COLLECTION AND OPERATOR TRAINING USING AN ARTIFICIAL-INTELLIGENCE SYSTEM SO FUSION TECHNOLOGY LA English DT Article AB A computer-based Expert Adviser has been developed to catalog technical expertise and dispense this knowledge to operators of a complex system of distillation columns at the Los Alamos National Laboratory (LANL). The Expert Adviser is also used to train personnel in operation of the LANL Tritium Systems Test Assembly (TSTA) Isotope Separations System (ISS). The methodology is applicable to a wide range of operations where documentation and transfer of knowledge is desirable. C1 JAPAN ATOM ENERGY RES INST,TOKYO,JAPAN. RP BARNES, J (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 5 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 MAY PY 1992 VL 21 IS 3 BP 1968 EP 1973 PN 2B PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200033 ER PT J AU NASISE, JE ANDERSON, JL NARUSE, Y AF NASISE, JE ANDERSON, JL NARUSE, Y TI MOLECULAR-SIEVE REGENERATION SYSTEM FOR ASSAYING HTO FROM DETRITATION SYSTEMS SO FUSION TECHNOLOGY LA English DT Article AB A Molecular Sieve Regeneration System (MSRS) is being added to the existing Tritium Waste Treatment system (TWT) within the Tritium Systems Test Assembly (TSTA) at the Los Alamos National Laboratory. This system is an upgrade to the TWT to provide accurate measurements of the liquid waste generated from this system. Within the TWT, hydrogen isotopes are removed from the effluent gas stream by the catalytic conversion to water and the subsequent removal of water by molecular sieve trapping prior to the release to the environment. Within the TWT and similar systems, molecular sieve regeneration is required to rejuvenate the beds. The major difference of the MSRS and other regeneration systems is the capability of direct tritium assay of long-term storage waste containers. This is accomplished with loop-flow regeneration, water collection, and tritiated water assay by scintillation and calorimetric techniques. This paper describes the MSRS in detail and how it is interfaced with the Tritium Waste Treatment system. C1 JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. RP NASISE, JE (reprint author), LOS ALAMOS NATL LAB,MAIL STOP C348,LOS ALAMOS,NM 87545, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1974 EP 1978 PN 2B PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200034 ER PT J AU HAYASHI, T KONISHI, S NAKAMURA, H INOUE, M HIRATA, K OKUNO, K NARUSE, Y BARNES, JW HARBIN, W WILHELM, R KING, M BARTLIT, JR ANDERSON, JL AF HAYASHI, T KONISHI, S NAKAMURA, H INOUE, M HIRATA, K OKUNO, K NARUSE, Y BARNES, JW HARBIN, W WILHELM, R KING, M BARTLIT, JR ANDERSON, JL TI RECENT TRITIUM EXPERIMENTS OF THE JAERI FUEL CLEANUP SYSTEM (JFCU) AT THE TRITIUM SYSTEMS TEST ASSEMBLY (TSTA) SO FUSION TECHNOLOGY LA English DT Article AB The JAERI (Japan Atomic Energy Research Institute) Fuel Cleanup system (JFCU), which accepts simulated fusion reactor exhausts and produces pure hydrogen isotopes and tritium-free waste, was tested at the Tritium Systems Test Assembly (TSTA) with gram levels of tritium in 1991 under the US/Japan collaboration program on Fusion Technology. In 1991, the JFCU system integrity and safe operation with gram level tritium were demonstrated. Component performances with tritium were also measured and further subjects for R&D were uncovered. The resident tritium inventory of the JFCU was evaluated at about six grams during TSTA loop operation with a DT (1:1) mixture. After these tests, all tritium used in the experiments was recovered as hydrogen isotopes gases. C1 LOS ALAMOS NATL LAB,TRITIUM SYST TEST ASSEMBLY,LOS ALAMOS,NM 87545. RP HAYASHI, T (reprint author), JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1979 EP 1983 PN 2B PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200035 ER PT J AU BARNES, J HARBIN, W ANDERSON, J BARTLIT, J HAYASHI, T NAKAMURA, H INOUE, M HIRATA, K OKUNO, K NARUSE, Y AF BARNES, J HARBIN, W ANDERSON, J BARTLIT, J HAYASHI, T NAKAMURA, H INOUE, M HIRATA, K OKUNO, K NARUSE, Y TI EXPERIENCE WITH MAINTENANCE OF A TRITIUM CONTAMINATED TEST COMPONENT AT TSTA SO FUSION TECHNOLOGY LA English DT Article AB The United States Department of Energy and the Japan Atomic Energy Research Institute (JAERI) have installed a full-scale fuel cleanup system (JFCU) at the Los Alamos Tritium Systems Test Assembly (TSTA) for testing. A component in the JFCU, the Ceramic Electrolysis Cell (CEC), was observed to have an internal leak after approximately one year of intermittent tests. This paper describes the experience of removal, decontamination and disassembly of this full-scale component. C1 JAPAN ATOM ENERGY RES INST,TOKYO,JAPAN. RP BARNES, J (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 0 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 MAY PY 1992 VL 21 IS 3 BP 1984 EP 1986 PN 2B PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200036 ER PT J AU HOLLAND, DF CADWALLADER, LC PIET, SJ AF HOLLAND, DF CADWALLADER, LC PIET, SJ TI IMPROVING THE VALUE OF RISK ASSESSMENTS FOR FUSION SO FUSION TECHNOLOGY LA English DT Article ID SAFETY ANALYSIS; SYSTEM; TOKAMAK AB This paper reviews the effectiveness of risk assessments performed for fusion reactor designs. Risk assessment methods have been used to improve safety and reliability and to assess the adequacy of designs. Based on our experience in performing and applying risk analysis, we have developed seven criteria for evaluation of usefulness. These criteria address the purpose, failure data base, assumptions, complexity, completeness, results, and presentation. We reviewed 19 fusion studies and rated them against these criteria. The results of the review are presented together with some examples of benefits received from risk studies. Finally, we present recommendations for improving the effectiveness of risk studies. RP HOLLAND, DF (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. RI Cadwallader, Lee/F-6933-2014 NR 25 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 1989 EP 1993 PN 2B PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200037 ER PT J AU CHENG, ET SZE, DK SOMMERS, JA FARMER, OT AF CHENG, ET SZE, DK SOMMERS, JA FARMER, OT TI MATERIALS RECYCLING CONSIDERATIONS FOR D-T FUSION-REACTORS SO FUSION TECHNOLOGY LA English DT Article ID RADIOACTIVE-WASTE AB Materials recycling aspects including contact gamma dose rates and cooling times were investigated for the first wall, blanket, and shield components of future fusion power reactors. Candidate structural mate-rials studied include ferritic steel, vanadium alloy, and SiC ceramic material. Required cooling times to reach hands-on recycling and impurity levels at given cooling times were estimated for the blanket components made of the various candidate structural materials. The relationship between the specific activity limits of radioactive materials for shallow-land burial (U.S. 10CFR61 Class C) waste disposal and the corresponding contact dose rates was examined. Scenarios for waste material management of fusion reactor components were suggested considering the materials recycling and shallow-land waste disposal options. Achievable impurity levels in vanadium ingot and titanium crystal bar were reviewed, and compared to desired levels for hands-on recycling. Methods to improve the purity levels were discussed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. TELEDYNE WAH CHANG CORP,ALBANY,OR 97321. RP CHENG, ET (reprint author), TSI RES INC,225 STEVENS AVE 110,SOLANA BEACH,CA 92075, USA. NR 21 TC 12 Z9 13 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 MAY PY 1992 VL 21 IS 3 BP 2001 EP 2008 PN 2B PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200039 ER PT J AU GORANSON, PL AF GORANSON, PL TI HYDROGEN HYDROCARBON EXPLOSIONS IN THE ITER VACUUM VESSEL SO FUSION TECHNOLOGY LA English DT Article AB The consequences of H-2/hydrocarbon detonations in the vacuum vessel (torus) of the International Thermonuclear Experimental Reactor (ITER) have been studied. The most likely scenario for such a detonation involves a water leak into the torus and a vent of the torus to atmosphere, permitting the formation of an explosive fuel-air mixture. The generation of fuel gases and possible sources of air or oxygen are reviewed, and the severity and effects of specific fuel-air mixture explosions are evaluated. Detonation or deflagration of an explosive mixture could result in pressures exceeding the maximum allowable torus pressure. Further studies to examine the design details and develop an event-tree study of events following a gas detonation are recommended. RP GORANSON, PL (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 4 TC 0 Z9 0 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 2041 EP 2045 PN 2B PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200045 ER PT J AU WALTON, GR COMMANDER, JC AF WALTON, GR COMMANDER, JC TI PRELIMINARY DECONTAMINATION AND DECOMMISSIONING PLAN FOR THE TOKAMAK FUSION TEST REACTOR SO FUSION TECHNOLOGY LA English DT Article AB The Tokamak Fusion Test Reactor (TFTR) Preliminary Decontamination and Decommissioning (D&D) Plan1 was developed to provide a framework for estimating the costs and schedule for implementing a final D&D Plan. This work will be used in evaluating the future use of the TFTR Test Cell. D&D planning and estimates were generated for two cases of plasma operations for TFTR. The first scenario is for continued operation in deuterium-deuterium (D-D) plasmas and subsequent decommissioning. This scenario would require D&D to a TFTR which is slightly activated and contaminated but still with a capability for "hands-on" D&D work. The second scenario calls for deuterium-tritium (D-T) plasma operations. In this scenario TFTR becomes highly activated and contaminated with tritium. This operational scenario will result in a TFTR which will require D&D involving remote handling. The end result in either scenario would provide a Test Cell which is available for future use. This paper will discuss the D&D objectives, management, safety and technical plans, and critical assumptions made in order to develop cost and schedule estimates. RP WALTON, GR (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 9 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 MAY PY 1992 VL 21 IS 3 BP 2062 EP 2066 PN 2B PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200049 ER PT J AU SZE, DK MATTAS, RF HULL, AB PICOLOGLOU, B SMITH, DL AF SZE, DK MATTAS, RF HULL, AB PICOLOGLOU, B SMITH, DL TI MHD CONSIDERATIONS FOR A SELF-COOLED LIQUID LITHIUM BLANKET SO FUSION TECHNOLOGY LA English DT Article AB The magnetohydrodynamic (MHD) effects can present a feasibility issue for a self-cooled liquid metal blanket of magnetically confined fusion reactors, expecially inboard regime of a tokamak. This pressure drop can be significantly reduced by using insulated wall structure. A self-healing insulating coating has been identified, which will reduce the pressure drop by more than a factor of 10. The future research direction to further quantify the performance of this coating is also outlined. RP SZE, DK (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 16 TC 13 Z9 13 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 MAY PY 1992 VL 21 IS 3 BP 2099 EP 2106 PN 2B PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200054 ER PT J AU SMITH, JR AF SMITH, JR TI NEUTRON MULTIPLICATION IN BERYLLIUM SO FUSION TECHNOLOGY LA English DT Article ID LEAKAGE MULTIPLICATION; SPHERES AB The multiplication of 14-MeV neutrons in bulk beryllium has been measured using the manganese bath technique. Values of the multiplication have been obtained for beryllium samples of four thicknesses. Detailed calculations of the multiplication and all the systematic effects were made, utilizing a highly detailed three-dimensional model with the Monte Carlo program MCNP. The Young and Stewart and the ENDF/B-VI evaluations for beryllium were utilized in the analysis. Both data sets produce multiplication values that are in excellent agreement with the manganese bath measurements for both raw and corrected values of the multiplication. We conclude that there is no real discrepancy between experimental and calculated values for the multiplication of neutrons in bulk beryllium. RP SMITH, JR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 21 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 2117 EP 2122 PN 2B PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200057 ER PT J AU BARLEON, L BUHLER, L MACK, KJ STIEGLITZ, R PICOLOGLOU, BF HUA, TQ REED, CB AF BARLEON, L BUHLER, L MACK, KJ STIEGLITZ, R PICOLOGLOU, BF HUA, TQ REED, CB TI LIQUID-METAL FLOW THROUGH A RIGHT ANGLE BEND IN A STRONG MAGNETIC-FIELD SO FUSION TECHNOLOGY LA English DT Article AB In designing a self-cooled liquid metal blanket based on the poloidal-toroidal flow concept, the magnitude of the MHD pressure drop and the character of the velocity distribution in the first wall coolant channels, that result from 3-dimensional MHD effects associated with the required right angle bends in the coolant flow, represent important design issues. To address these issues and to verify the relevant models used in the design, a joint MHD-experiment was conducted by Argonne National Laboratory (ANL) and Kernforschungszentrum Karlsruhe (KfK). The test article was designed and built at ANL, and the experiments were performed at KfK's MEKKA facility using a 3.6 Tesla superconducting solenoid magnet and a eutectic sodium potassium alloy working fluid. In the experiments, detailed voltage and pressure distributions on the duct walls and voltage distributions within the liquid metal were measured under a variety of Hartmann numbers and interaction parameters. Representative results from these measurements are presented and compared to analytical predictions valid for very high interaction parameters (inertialess flow). Results indicate that deviation between analysis and experiment is confined to the immediate vicinity of the right angle sharp corner and that, for fusion blanket conditions, the 3-dimensional pressure drop in the radial-toroidal bend of an electrically separated single channel is small compared with the pressure drop of the radial flow. C1 ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP BARLEON, L (reprint author), KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST APPL THERMO & FLUID DYNAM,P BOX 3460,W-7500 KARLSRUHE 1,GERMANY. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAY PY 1992 VL 21 IS 3 BP 2197 EP 2203 PN 2B PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX672 UT WOS:A1992HX67200069 ER PT J AU UCKAN, NA AF UCKAN, NA TI 10TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY - MEETING HIGHLIGHTS SO FUSION TECHNOLOGY LA English DT Editorial Material RP UCKAN, NA (reprint author), OAK RIDGE NATL LAB,TECH PROGRAM CHAIR,OAK RIDGE,TN 37831, USA. NR 0 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 MAY PY 1992 VL 21 IS 3 BP R11 EP R11 PN 2A PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HX670 UT WOS:A1992HX67000001 ER PT J AU WELLS, KB AF WELLS, KB TI MEDICARES PPS IMPLEMENTATION AND INCREASE IN RECORDING OF PSYCHOTIC DEPRESSIVE DISORDER - SOME THOUGHTS ON THE REASONS SO GENERAL HOSPITAL PSYCHIATRY LA English DT Editorial Material ID PROSPECTIVE PAYMENT; PSYCHIATRY C1 LOS ALAMOS NATL LAB,DEPT PSYCHIAT,LOS ALAMOS,NM 87544. NR 5 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0163-8343 J9 GEN HOSP PSYCHIAT JI Gen. Hosp. Psych. PD MAY PY 1992 VL 14 IS 3 BP 153 EP 155 DI 10.1016/0163-8343(92)90076-M PG 3 WC Psychiatry SC Psychiatry GA HW351 UT WOS:A1992HW35100001 PM 1601290 ER PT J AU MURRAY, RW TENBRINK, MRB GERLACH, DC RUSS, GP JONES, DL AF MURRAY, RW TENBRINK, MRB GERLACH, DC RUSS, GP JONES, DL TI INTEROCEANIC VARIATION IN THE RARE-EARTH, MAJOR, AND TRACE-ELEMENT DEPOSITIONAL CHEMISTRY OF CHERT - PERSPECTIVES GAINED FROM THE DSDP AND ODP RECORD SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID FERROMANGANESE NODULES; PELAGIC SEDIMENTS; SEA-WATER; PACIFIC; GEOCHEMISTRY; SEAWATER; OCEAN; DIAGENESIS; CALIFORNIA; MECHANISM AB Rare earth element (REE), major, and trace element abundances and relative fractionations in forty nodular cherts sampled by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) indicate that the REE composition of chert records the interplay between terrigenous sources and scavenging from the local seawater. Major and (non-REE) trace element ratios indicate that the aluminosilicate fraction within the chert is similar to NASC (North American Shale Composite), with average Pacific chert including approximately 7% NASC-like particles, Indian chert approximately 11% NASC, Atlantic chert approximately 17% NASC, and southern high latitude (SHL) chert 53% NASC. Using La as a proxy for SIGMA-REE, approximations of La(ex) (the amount of La in excess of that supplied by the detrital aluminosilicate fraction) indicate that Pacific chert contains the greatest La(ex) (85% of La(total) and SHL chert the least (38% of La(total). As shown by interelement associations, this La(ex) is most likely an adsorbed component onto aluminosilicate and phosphatic phases. Accordingly, chert from the large Pacific Ocean, where deposition occurs relatively removed from significant terrigenous input, records a depositional REE signal dominated by adsorption of dissolved REEs from seawater. Pacific chert Ce/Ce* much less than 1 and La(n)/Yb(n) approximately 0.8-1, resulting from adsorption of local Ce-depleted seawater and preferential adsorption of LREEs from seawater (e.g., La(n)/Yb(n) approximately 0.4), which increases the La(n)/Yb(n) ratio recorded in chert. Chert from the Atlantic basin, a moderately sized ocean basin lined by passive margins and with more terrigenous input than the Pacific, records a mix of adsorptive and terrigenous REE signals, with moderately negative Ce anomalies and La(n)/Yb(n) ratios intermediate to those of the Pacific and those of terrigenous input. Chert from the SHL region is dominated by the large terrigenous input on the Antarctic passive margin, with inherited Ce/Ce* approximately 1 and inherited La(n)/Yb(n) values of approximately 1.2-1.4. Ce/Ce* does not vary with age, either throughout the entire data base or within a particular basin. Overall, Ce/Ce* does not correlate with P2O5 concentrations, even though phosphatic phases may be an important REE carrier. This and previous studies of the large-scale controlling parameters of sedimentary REEs across ocean basins collectively indicate that REE indices of depositional regime (e.g., Ce/Ce*, La(n)/Yb(n), La(ex) are reproducible in a variety of sediment and rock lithologies, ages, and ocean basins, and present a coherent tool for paleoceanographic and tectonic basin reconstructions. C1 UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550. NR 40 TC 85 Z9 114 U1 0 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAY PY 1992 VL 56 IS 5 BP 1897 EP 1913 DI 10.1016/0016-7037(92)90319-E PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HU413 UT WOS:A1992HU41300010 ER PT J AU MOORE, GK AF MOORE, GK TI HYDROGRAPH ANALYSIS IN A FRACTURED ROCK TERRANE SO GROUND WATER LA English DT Article ID MACROPOROSITY AB A typical watershed near Oak Ridge, Tennessee is underlaid by a stormflow zone, which approximately corresponds with the root zone of vegetation, and by a ground-water zone. Analysis of the streamflow hydrograph and water-level hydrographs during the nongrowing season shows that discharge from the stormflow zone constitutes nearly all streamflow after the end of overland runoff but that discharge from the ground-water zone is dominant after about 8-10 d (days) of recession. Simple equations that express the relationship between streamflow recession and storage depletion can be used to calculate average values of specific yield, transmissivity, and hydraulic conductivity in both the stormflow and ground-water zones. The calculated values are reasonable and are nearly the same as those obtained by other methods. C1 UNIV TENNESSEE,DEPT CIVIL ENGN,KNOXVILLE,TN 37996. RP MOORE, GK (reprint author), OAK RIDGE NATL LAB,DIV CELL BIOPHYS,POB 2008,OAK RIDGE,TN 37831, USA. NR 15 TC 33 Z9 33 U1 0 U2 9 PU GROUND WATER PUBLISHING CO PI WESTERVILLE PA 601 DEMPSEY RD, WESTERVILLE, OH 43081 SN 0017-467X J9 GROUND WATER JI Ground Water PD MAY-JUN PY 1992 VL 30 IS 3 BP 390 EP 395 DI 10.1111/j.1745-6584.1992.tb02007.x PG 6 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA HT013 UT WOS:A1992HT01300009 ER EF