FN Thomson Reuters Web of Science™ VR 1.0 PT J AU FINN, PA SZE, DK AF FINN, PA SZE, DK TI HELIUM PROCESSING FOR DEUTERIUM HELIUM BURNS IN ITERS PHYSICS PHASE SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB The requirements for vacuum pumping and fuel processing for deuterium/helium (D/He-3) burns in the physics operating phase for the International Thermonuclear Experimental Reactor (ITER) were assessed. These burns are expected to have low fusion power (100 MW), short burn times (less-than-or-equal-to 30 s), limited operation (2000 shots), and a fractional burn approximately 0.3%. For the physics phase, the fuel processing system will include several units to separate deuterium and helium (activated charcoal bed, SAES getter and a Pd/Ag diffuser), as well as an isotopic separation system to separate He-3 and He-4. The needed vacuum system's cryosorption surface area may be as large as 10 m2 if the burn time is approximately 200 s, the fractional burn is < 0.3%, or the fusion power is > 100 MW. RP FINN, PA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,FUS POWER PROGRAM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 15 EP 18 DI 10.1016/0920-3796(91)90100-5 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500002 ER PT J AU KONISHI, S INOUE, M HAYASHI, T OHIRA, S WATANABE, T OKUNO, K NARUSE, Y BARNES, JW BARTLIT, JR ANDERSON, JL AF KONISHI, S INOUE, M HAYASHI, T OHIRA, S WATANABE, T OKUNO, K NARUSE, Y BARNES, JW BARTLIT, JR ANDERSON, JL TI EARLY EXPERIMENTS OF JAERI FUEL CLEANUP SYSTEM AT THE TRITIUM SYSTEMS TEST ASSEMBLY SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL ID PALLADIUM AB The Tritium Process Laboratory (TPL) at the Japan Atomic Energy Research Institute (JAERI) has developed a Fuel Cleanup System (FCU) which accepts simulated fusion reactor exhaust and produces pure hydrogen isotopes and tritium-free waste. Under the collaboration program of USDOE and JAERI, an integrated process, the "JAERI Fuel Cleanup System" (JFCU) was designed and fabricated for testing at the Tritium Systems Test Assembly (TSTA) as a major subsystem of the simulated fusion fuel cycle. The JFCU has the capability to continuously process a mixture of hydrogen isotopes and impurities of 15 mol/h. The major components are: a palladium diffuser for hydrogen isotopes purification, a catalytic reactor for oxidation of tritium in impurities, cold traps for separation of tritiated water to produce exhaust containing a very low level of tritium, a ceramic electrolysis cell for decomposition of tritiated water, and zirconium-cobalt beds for hydrogen isotopes storage. In early 1990, the JFCU was installed in the TSTA and preliminary testing without tritium was initiated. Components such as the palladium diffuser, cold traps, catalytic reactor, scroll pump and electrolysis cell were tested independently as well as in the integrated process tests. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KONISHI, S (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 8 TC 3 Z9 3 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 33 EP 37 DI 10.1016/0920-3796(91)90103-W PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500005 ER PT J AU WILLMS, RS KONISHI, S AF WILLMS, RS KONISHI, S TI FUEL CLEANUP SYSTEMS FOR FUSION FUEL PROCESSING SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL ID PERMSELECTIVE WALL; EQUILIBRIUM SHIFT; REACTOR; WATER AB The fuel cleanup unit (FCU) of a fusion fuel processing system receives gas from the torus evacuation system which is composed of hydrogen isotopes (deuterium and tritium) contaminated with a few to possibly around 20% of impurities (methane, helium, protium, water, nitrogen, carbon oxides, ammonia, etc.). Because the usual processing step subsequent to the FCU, the cryogenic isotope separation system (ISS), operates at about 25 K, the FCU must remove all impurities which freeze at this temperature to prevent ISS plugging. This includes all impurities other than helium and protium. This first function of the FCU is termed purification. The collected impurities contain a substantial quantity of tritium largely in the form of methane (and higher hydrocarbons), water and ammonia. This tritium must be recovered from the impurities before the remaining non-radioactive components may be discarded. This second function is referred to as tritium recovery. To accomplish these two functions a number of techniques have been proposed and investigated. This paper presents these techniques and identifies the merits and range of utility of each method. C1 JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. RP WILLMS, RS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MAIL STOP C-348,LOS ALAMOS,NM 87545, USA. NR 32 TC 11 Z9 11 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 53 EP 60 DI 10.1016/0920-3796(91)90107-2 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500009 ER PT J AU SMID, I CARDELLA, A CROESSMANN, CD WATSON, RD REHEIS, N KNERINGER, G AF SMID, I CARDELLA, A CROESSMANN, CD WATSON, RD REHEIS, N KNERINGER, G TI RESPONSE TO HIGH HEAT FLUXES AND METALLURGICAL EXAMINATION OF A BRAZED CARBON-FIBER-COMPOSITE REFRACTORY-METAL DIVERTOR MOCK-UP SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB As a feasibility-study an actively cooled divertor mock-up has been subjected to high heat flux loading in electron beam simulation. The divertor design concept is based on a carbon-fiber-composite material (Aerolor 05) brazed onto a TZM/Mo41 Re heat sink. The plasma facing carbon armor is divided in seven tiles to allow variable loading parameters - and repeated destructive tests. The mock-up has survived high heat flux loading up to about 12 MW/m2 surface heat flux in steady-state conditions. One armor tile showed no change in the thermal response even after 500 s at approximately 14 MW/m2. To estimate the general thermal response of the mock-up design, numerical methods were applied. The predicted behavior was confirmed by the experimental results. The loading experiments were followed by a detailed metallurgical investigation of the loaded sample regions and the braze joints. The typical damages after high heat flux testing and cycling were failure (i.e. detachment) in the Zr brazed carbon/TZM joint, and failure in the CuPd bonded TZM/TZM joint due to an excess of the melting temperature of the brazes. The microstructural changes in the braze regions and the recrystallization behavior of the refractory alloys are discussed. Only in one case the loaded surface of the carbon armor shows considerable erosion, caused by a partial detachment along a braze joint and thus loss of the good thermal contact during the last applied loading shots. The thermal analyses and high heat flux performance of the Aerolor-05 armored mock-up are compared to the thermal response of a previously tested mock-up of corresponding geometry with armor tiles of isotropic graphite. C1 NET TEAM,W-8046 GARCHING,GERMANY. MET WERK PLANSEE GMBH,A-6600 REUTTE,AUSTRIA. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SMID, I (reprint author), OSTERREICH FORSCHUNGSZENTRUM,A-2444 SEIBERSDORF,AUSTRIA. NR 9 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 125 EP 133 DI 10.1016/0920-3796(91)90118-A PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500020 ER PT J AU VANDERLAAN, JG AKIBA, M HASSANEIN, A SEKI, M TANCHUK, V AF VANDERLAAN, JG AKIBA, M HASSANEIN, A SEKI, M TANCHUK, V TI PREDICTION FOR DISRUPTION EROSION OF ITER PLASMA FACING COMPONENTS - A COMPARISON OF EXPERIMENTAL AND NUMERICAL RESULTS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL ID PROTECTION AB An evaluation is given for the prediction for disruption erosion in the International Thermonuclear Engineering Reactor (ITER). At first, a description is given of the relation between plasma operating parameters and system dimensions to the predictions of loading parameters of Plasma Facing Components (PFC) in off-normal events. Numerical results from ITER parties on the prediction of disruption erosion are compared for a few typical cases and discussed. Apart from some differences in the codes, the observed discrepancies can be ascribed to different input data of material properties and boundary conditions. Some physical models for vapour shielding and their effects on numerical results are mentioned. Experimental results from ITER parties, obtained with electron and laser beams, are also compared. Erosion rates for the candidate ITER PFC materials are shown to depend very strongly on the energy deposition parameters, which are based on plasma physics considerations, and on the assumed material loss mechanisms. Lifetimes estimates for divertor plate and first wall armour are given for carbon, tungsten and beryllium, based on the erosion in the thermal quench phase. C1 JAPAN ATOM ENERGY RES INST,NAKA,IBARAKI 31101,JAPAN. ARGONNE NATL LAB,ARGONNE,IL 60439. DV EFREMOV ELECTROPHYS APPARATUS INST,LENINGRAD 189631,USSR. RP VANDERLAAN, JG (reprint author), MAX PLANCK INST PLASMA PHYS,NET TEAM,BOLTZMANNSTR 2,W-8046 GARCHING,GERMANY. NR 35 TC 27 Z9 27 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 135 EP 144 DI 10.1016/0920-3796(91)90119-B PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500021 ER PT J AU OYAMA, Y KONNO, C IKEDA, Y MAEKAWA, H MAEKAWA, F KOSAKO, K NAKAMURA, T KUMAR, A YOUSSEF, MZ ABDOU, MA BENNETT, EF AF OYAMA, Y KONNO, C IKEDA, Y MAEKAWA, H MAEKAWA, F KOSAKO, K NAKAMURA, T KUMAR, A YOUSSEF, MZ ABDOU, MA BENNETT, EF TI PHASE III EXPERIMENTAL RESULTS OF JAERI/USDOE COLLABORATIVE PROGRAM ON FUSION NEUTRONICS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL ID BLANKET AB A pseudo-line D-T neutron source has been developed with new experimental techniques. This line source was applied in sophisticated neutronics experiments for an annular blanket arrangement simulating the tokamak geometry, as a new series in the JAERI/USDOE collaborative experimental program on fusion neutronics. The source characteristics of the present line source and the measurements for an annular assembly are described. The discussion on the experimental results focuses on the tritium production rate measured in an annular blanket and comparisons were made with the previous point source experiment, and also between the annular blankets with and without an armor reflector of graphite. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. ARGONNE NATL LAB,ARGONNE,IL 60439. RP OYAMA, Y (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 7 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 203 EP 208 DI 10.1016/0920-3796(91)90128-D PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500030 ER PT J AU YOSHIKAWA, K SHIMOHIRO, D YAMAMOTO, Y TOKU, H INUI, Y ISHIKAWA, M UMOTO, J MIKI, N FUKUYAMA, A MITARAI, O OKAMOTO, M SEKIMOTO, H FUJII, Y KIM, H WATANABE, K ISHII, T TAKAGI, T SUZUKI, T MUTOH, I MIYAZAKI, K SAITOH, M LOGAN, BG BARR, WL HOFFMAN, MA CAMPBELL, RB AF YOSHIKAWA, K SHIMOHIRO, D YAMAMOTO, Y TOKU, H INUI, Y ISHIKAWA, M UMOTO, J MIKI, N FUKUYAMA, A MITARAI, O OKAMOTO, M SEKIMOTO, H FUJII, Y KIM, H WATANABE, K ISHII, T TAKAGI, T SUZUKI, T MUTOH, I MIYAZAKI, K SAITOH, M LOGAN, BG BARR, WL HOFFMAN, MA CAMPBELL, RB TI A D-T TOKAMAK FUSION-REACTOR WITH ADVANCED BLANKET USING COMPACT FUSION ADVANCED RANKINE (CFAR) CYCLE SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB Recent progress of a D-T tokamak fusion reactor with advanced blanket concept using CFAR (Compact Fusion Advanced Rankine) cycle is presented. High enthalpy extraction in excess of 50% was found achievable by a nonequilibrium disk-type MHD generator for gas stagnation temperatures of 3000 K superheated by synchrotron radiation, leading to a 40% overall plant efficiency with recuperative heat cycle and advanced thermoelectric converters. The stored magnetic energy of a 10 T MHD three-pairs Helmholtz-type magnet was estimated to be about 600 MJ per MHD generator. A mixture of mercury and lithium liquid flow was examined and found applicable to reduce the mercury inventory. The tritium permeation loss inherent in the relatively high temperature CFAR cycle, neutronics relating to tritium breeding and streaming through the waveguide and the MHD generator duct are discussed. Results of a 2000 h high temperature (600-700-degrees-C) mercury corrosion test of Type 304 stainless steel, a TZM alloy and four kinds of ceramic rods in refluxing mercury with 0.004 mol fraction of potassium admixture have shown no noticeable corrosion except for Type 304 stainless steel. C1 KYOTO UNIV,DEPT ELECT ENGN,SAKYO,KYOTO 603,JAPAN. OKAYAMA UNIV,DEPT ELECT & ELECTR ENGN,OKAYAMA 700,JAPAN. KUMAMOTO INST TECHNOL,DEPT ELECT ENGN,KUMAMOTO 860,JAPAN. TOKYO INST TECHNOL,NUCL ENGN RES LAB,TOKYO 152,JAPAN. TOHOKU UNIV,INST FLUID SCI,SENDAI,MIYAGI 980,JAPAN. NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN. OSAKA UNIV,SUITA,OSAKA 565,JAPAN. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DAVIS,CA 95616. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP YOSHIKAWA, K (reprint author), KYOTO UNIV,INST ATOM ENERGY,UJI,KYOTO 611,JAPAN. OI Takagi, Toshiyuki/0000-0003-1283-4320 NR 15 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 239 EP 248 DI 10.1016/0920-3796(91)90134-C PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500036 ER PT J AU KONNO, C IKEDA, Y KOSAKO, K OYAMA, Y MAEKAWA, H NAKAMURA, T BENNETT, EF AF KONNO, C IKEDA, Y KOSAKO, K OYAMA, Y MAEKAWA, H NAKAMURA, T BENNETT, EF TI MEASUREMENT AND ANALYSIS OF LOW-ENERGY NEUTRON-SPECTRUM IN A LARGE CYLINDRICAL IRON ASSEMBLY BOMBARDED BY D-T NEUTRONS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB The experimental measurement of low energy neutron spectra in a large iron assembly is essential to examine nuclear data and neutron transport codes for nuclear heating estimations in the superconducting magnet of a fusion reactor as well as shielding design. In-situ neutron spectra between a few keV and 1 MeV in a 0.95 m thick cylindrical iron assembly, bombarded with D-T neutrons, have been measured, using a proton recoil gas proportional counter (PRC). A newly developed data acquisition system for PRC was adopted, where high voltage varies continuously in ramped shape during acquisition. Experimental analyses were performed by the DOT3.5 and MCNP codes with cross section sets based on the JENDL-3 nuclear data library. From the comparison between the measured and calculated neutron spectra, the following facts were obtained. The calculation by DOT3.5 overestimated the experiment by a factor of about 2 for the flux below 500 keV in the front parts of the iron assembly and underestimated by more than a factor of 2 for the flux above 500 keV in the rear parts. The calculation by MCNP gave a general agreement with the measurement, but the discrepancy above 100 keV increased as the detector position moved deeper into the assembly. The calculation above 500 keV underestimated the measured spectrum by more than 30% at the 0.81 m depth. C1 ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP KONNO, C (reprint author), JAPAN ATOM ENERGY RES INST,DEPT REACTOR ENGN,TOKAI,IBARAKI 31911,JAPAN. NR 18 TC 15 Z9 15 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 297 EP 303 DI 10.1016/0920-3796(91)90142-D PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500044 ER PT J AU SZE, DK SVIATOSLAVSKY, I SAWAN, M GIERSZEWSKI, P HOLLIES, R SHARAFAT, S HERRING, S AF SZE, DK SVIATOSLAVSKY, I SAWAN, M GIERSZEWSKI, P HOLLIES, R SHARAFAT, S HERRING, S TI ORGANIC COOLANT FOR ARIES-III SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB ARIES-III is a D-He-3 reactor design study. It is found that the organic coolant is well suited for the D-He-3 reactor. This paper discusses the unique features of the D-He-3 reactor, and the reason that the organic coolant is compatible with those features. The problems associated with the organic coolant are also discussed. C1 UNIV WISCONSIN,MADISON,WI 53706. CANADIAN FUS FUELS TECHNOL PROJECT,TORONTO,ONTARIO,CANADA. IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RP SZE, DK (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,BLDG 205,ARGONNE,IL 60439, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 18 BP 435 EP 441 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB285 UT WOS:A1991HB28500062 ER PT J AU TAM, SW AMBROSE, V AF TAM, SW AMBROSE, V TI TRITIUM PERCOLATION THROUGH POROUS CERAMIC BREEDERS - A RANDOM-LATTICE APPROACH SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT 2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL ID LITHIUM-BASE CERAMICS; COMPREHENSIVE MODEL; TRANSPORT; BEHAVIOR AB Among the major processes leading to tritium transport through Li ceramic breeders the percolation of gaseous tritium species through the connected porosity remains the least amenable to a satisfactory treatment. The combination of diffusion and reaction through the convoluted transport pathways prescribed by the system of pores poses a formidable The key issue is to make the fundamental connection between the tortuousity of the medium with the transport processes in terms of only basic parameters (e.g., molecular diffusion coefficient and porosity distribution) that are amenable to fundamental understanding and experimental determinations. This fundamental challenge is mct within the following approaches. On the microscale the short range transport is modeled via a convection-diffusion-reaction approach. On a macro scale the long range transport is described within a matrix formalism. The convoluted microstructure of the pore system as prescribed from experimental measurements is synthesized into the present approach via monte carlo simulation techniques. In this way the approach requires as inputs only physical-chemical parameters that are amenable to clear basic understanding and experimental determination. In this sense it provides predictive capability. Using this approach the concept of residence time has been analyzed in a critical manner. Implication for tritium release experiments was discussed. RP TAM, SW (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 15 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 17 BP 43 EP 48 DI 10.1016/0920-3796(91)90034-N PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB348 UT WOS:A1991HB34800008 ER PT J AU BOTTER, F TISTCHENKO, S BRIEC, M KOPASZ, JP AF BOTTER, F TISTCHENKO, S BRIEC, M KOPASZ, JP TI PROGRESS IN THE KNOWLEDGE OF THE MECHANISM OF TRITIUM RELEASE FROM LITHIUM CERAMICS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT 2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB Tritium extraction experiments have been performed in various experimental conditions, most of the time out-of-pile, with a sweep gas containing 1000 vpm H-2 and at fixed temperatures. They were performed on pure or doped lithium aluminates or orthosilicates. The fine material texture, the type of defects created by dopant insertion. and Li+ mobility were known by various techniques. Analysis of the tritium release has shown the presence of several types of sites for tritium and has allowed the study of the mechanisms' respective role as a function of experimental conditions, such as sample texture. In the particular case of large diameter single crystals, a combined contribution of diffusion and internal sites seems to explain the results obtained; in the case of sintered materials, the limiting step could be a desorption from discrete activation energies sites. C1 CEN,F-38041 GRENOBLE,FRANCE. ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. RP BOTTER, F (reprint author), CENS,DTA,SERC,F-91191 GIF SUR YVETTE,FRANCE. NR 15 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 17 BP 49 EP 54 DI 10.1016/0920-3796(91)90035-O PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB348 UT WOS:A1991HB34800009 ER PT J AU HERRING, JS HOLLAND, DF PIET, SJ AF HERRING, JS HOLLAND, DF PIET, SJ TI TRENDS IN FUSION-REACTOR SAFETY RESEARCH SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT 2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP NUCL RES CTR KARLSRUHE, COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL AB Fusion has the potential to be an attractive energy source. From the safety and environmental perspective, fusion must avoid concerns about catastrophic accidents and unsolvable waste disposal. In addition. fusion must achieve an acceptable level of risk from operational accidents that result in public exposure and economic loss. Finally, fusion reactors must control routine radioactive effluent, particularly tritium. Major progress in achieving this potential rests on development of low-activation materials or alternative fuels. The safety and performance of various material choices and fuels for commercial fusion reactors can be investigated relatively inexpensively through reactor design studies. These studies bring together experts in a wide range of backgrounds and force the group to either agree on a reactor design or identify areas for further study. Fusion reactors will be complex with distributed radioactive inventories. The next generation of experiments will be critical in demonstrating that acceptable levels of safe operation can be achieved. These machines will use materials which are available today and for which a large database exists (e.g. for 316 stainless steel). Researchers have developed a good understanding of the risks associated with operation of these devices. Specifically. consequences from coolant system failures, loss of vacuum events, tritium releases, and liquid-metal reactions have been studied. Recent studies go beyond next-step designs and investigate commercial reactor concerns including tritium release and liquid metal reactions. RP HERRING, JS (reprint author), IDAHO NATL ENGN LAB,FUS SAFETY PROGRAM,IDAHO FALLS,ID, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 17 BP 295 EP 299 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB348 UT WOS:A1991HB34800046 ER PT J AU VIEIDER, G CARDELLA, A AKIBA, M MATERA, R WATSON, R AF VIEIDER, G CARDELLA, A AKIBA, M MATERA, R WATSON, R TI ITER PLASMA FACING COMPONENTS, DESIGN AND DEVELOPMENT SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE AB The paper summarizes the collaborative effort of the ITER Conceptual Design Activity (CDA) on Plasma Facing Components (PFC) which focused on the following main tasks: (a) the definition of basic design concepts for the First Wall (FW) and Divertor Plates (DP), (b) the analysis of the performance and likely lifetime of these PFC designs including the identification of major critical issues, (c) the start of R&D work giving already first results, and the definition of the required further R&D program to support the contemplated ITER Engineering Design Activity (EDA). From the ITER CDA effort on PFC it is mainly concluded that: (a) the expected PFC operating conditions lead to design solutions at the limit of present technology in particular for the divertor, which may constrain the overall machine performance, (b) the development of convincing PFC designs requires an intensified R&D effort both on PFC technology and plasma physics. C1 JRC,INST ADV MAT,ISPRA,ITALY. JAPAN ATOM ENERGY RES INST,PLASMA HEATING LAB,NARA,JAPAN. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP VIEIDER, G (reprint author), MAX PLANCK INST PLASMA PHYS,NET TEAM,W-8046 GARCHING,GERMANY. NR 24 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 23 EP 34 DI 10.1016/0920-3796(91)90180-X PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300004 ER PT J AU RAEDER, J PIET, SJ IIDA, H KOLBASOV, B AF RAEDER, J PIET, SJ IIDA, H KOLBASOV, B TI SAFETY ANALYSIS AND RADIOACTIVITY CONFINEMENT FOR ITER SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE AB The paper summarizes the main results of an collaborative effort by the ITER safety group (within the Systems Project Unit). The work was done in support of ITER design and evolved in collaboration with the other ITER groups. A safety approach has been defined and radioactivity dose limits have been quantified both in terms of target numbers for the design and of estimated limits expected to be requested by the regulatory bodies. Doses due to normal operation effluents of tritium and activation products have been estimated. Accidents of significance have been identified. Emphasis of accident analysis was put on events related to plasma (vacuum) chamber and cooling system. A confinement concept has been specified and assessed in terms of effective release fractions for accidental situations involving mobilization of both tritium and activation products. The masses of decommissioning and operational radioactive waste have been estimated and broadly characterized by the potential disposal options. Overall, the safety work resulted in safety features implemented in the design, recommendations pending for the EDA, and identification of potential problems to be resolved by EDA safety work as well as by safety related R&D. C1 JAPAN ATOM ENERGY RES INST,NAKA,IBARAKI 31101,JAPAN. EG&G IDAHO INC,INEL,IDAHO FALLS,ID 83415. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,USSR. RP RAEDER, J (reprint author), MAX PLANCK INST PLASMA PHYS,NET TEAM,W-8046 GARCHING,GERMANY. NR 5 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 35 EP 43 DI 10.1016/0920-3796(91)90181-O PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300005 ER PT J AU SHATALOV, GE ABDOU, MA ANTIPENKOV, A DAENNER, W GOHAR, Y KURODA, T SIMBOLOTTI, G SMITH, DL YOSHIDA, N AF SHATALOV, GE ABDOU, MA ANTIPENKOV, A DAENNER, W GOHAR, Y KURODA, T SIMBOLOTTI, G SMITH, DL YOSHIDA, N TI BREEDER AND TEST BLANKETS IN ITER SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE AB An overview of ITER efforts is presented in this paper in the area of blanket development and ITER test program preparation. The design of ceramic and eutectic options of the driver blanket were developed aimed on a reliable operation and adequate tritium production. With an estimated net tritium breeding ratio of 0.8-0.95 ITER is able to achieve testing fluence goal of 1 MWa/m2 during 8 years of technology phase operation. The test program was developed to ensure realistic extrapolation to DEMO on the basis of ITER experience. Submodules for the blanket, high heat flux components and material testing are to be inserted in especially designed test ports. Tests are provided for DEMO-relevant blanket design concepts. C1 JAPAN ATOM ENERGY RES INST,NAKA,IBARAKI 31101,JAPAN. ENEA,CTR RIC ENERGIA FRASCATI,I-00044 FRASCATI,ITALY. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. MOSCOW POWER ENGN RES & DEV INST,MOSCOW 101000,USSR. MAX PLANCK INST PLASMA PHYS,NET TEAM,W-8046 GARCHING,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. RP SHATALOV, GE (reprint author), IV KURCHATOV ATOM ENERGY INST,PLOSHCHAD AKAD KURCHATOVA 46,MOSCOW 123060,USSR. NR 3 TC 7 Z9 7 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 85 EP 93 DI 10.1016/0920-3796(91)90185-S PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300009 ER PT J AU MALANG, S LEROY, P CASINI, GP MATTAS, RF STREBKOV, Y AF MALANG, S LEROY, P CASINI, GP MATTAS, RF STREBKOV, Y TI CRUCIAL ISSUES ON LIQUID-METAL BLANKET DESIGN SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE ID HEAT-TRANSFER; FUSION-REACTORS; MAGNETOHYDRODYNAMIC FLOW; FLUID-FLOW; LITHIUM; SAFETY AB Typical design concepts of liquid metal breeder blankets for power reactors are explained and characterized. The major problems of these concepts are described for both water-cooled blankets and self-cooled blankets. Three crucial issues of liquid metal breeder blankets are investigated. They are in the fields of magnetohydrodynamics, tritium control and safety. The influence of the magnetic field on liquid metal flow is of special interest for self-cooled blankets. The main problems in this field and the status of the related R&D-work are described. Tritium permeation losses to the cooling water is a crucial issue for water-cooled blankets. Methodes for its reduction are discussed. An inherent problems of all liquid breeder blankets is the potential release of activated products in the case of chemical reactions between the breeder material and water or reactive gases. The most important issues in this field are described. C1 JOINT RES CTR,CEC,I-21020 ISPRA,ITALY. CENS,CEA,F-91191 GIF SUR YVETTE,FRANCE. ARGONNE NATL LAB,ARGONNE,IL 60439. MOSCOW POWER RES & DEV INST,MOSCOW 101000,USSR. RP MALANG, S (reprint author), KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,POSTFACH 3640,W-7500 KARLSRUHE 1,GERMANY. NR 54 TC 38 Z9 43 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 95 EP 109 DI 10.1016/0920-3796(91)90186-T PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300010 ER PT J AU AKIBA, M BOLT, H WATSON, R KNERINGER, G LINKE, J AF AKIBA, M BOLT, H WATSON, R KNERINGER, G LINKE, J TI THE DEVELOPMENT OF DIVERTOR AND 1ST WALL ARMOR PARTS AT JAERI, SANDIA-NL AND KFA-JULICH SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE AB The development of new armour materials, and fabrication and testings of the divertor and first wall mock-ups have worldwidely been carried out during the Conceptual Design Activities (CDA) of ITER. This paper is a review of the activities on the divertor and first wall armour components which has been performed by JAERI, Sandia National Laboratory, and KFA Julich. The design requirements have instantly been reflected in material development. For instance, carbon fiber composites (CFC's) have already been developed to have a thermal conductivity as high as copper at room temperature. Further modification of CFC's has been made. Based on the extensive progress in armour materials, the fabrication and testings of mockups have been started. Divertor mock-ups which are able to endure a stationary heat flux of 8 to 15 MW/m2 have already been developed. Some new high heat flux test facilities have been constructed and are able to simulate a heat load of plasma disruption. Extensive understanding on disruption erosion of the armour materials has been obtained by experiments with these facilities. Some mock-up tests and disruption simulating tests have been performed under international collaboration. C1 UNIV TOKYO,NUCL ENGN RES LAB,TOKAI,IBARAKI 31911,JAPAN. MET WERK PLANSEE GMBH,A-6600 REUTTE,AUSTRIA. FORSCHUNGSZENTRUM JULICH GMBH,INST REAKTORWERKSTOFFE,W-5170 JULICH,GERMANY. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP AKIBA, M (reprint author), JAPAN ATOM ENERGY RES INST,801-1 NAKA MACHI,NAKA,IBARAKI 31101,JAPAN. NR 21 TC 9 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 111 EP 125 DI 10.1016/0920-3796(91)90187-U PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300011 ER PT J AU JOHNSON, CE KONDO, T ROUX, N TANAKA, S VOLLATH, D AF JOHNSON, CE KONDO, T ROUX, N TANAKA, S VOLLATH, D TI FABRICATION, PROPERTIES, AND TRITIUM RECOVERY FROM SOLID BREEDER MATERIALS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE ID GAMMA-LITHIUM ALUMINATE; FUSION-REACTOR BLANKET; RELEASE EXPERIMENTS; IRRADIATION DAMAGE; MATERIALS TTTEX; OXIDE; LI2O; BEHAVIOR; ORTHOSILICATE; DIFFUSION AB The breeding blanket is a key component of the fusion reactor because it directly involves tritium breeding and energy extraction, both of which are critical to development of fusion power. The lithium ceramics continue to show promise as candidate breeder materials. This promise was recognized by the International Thermonuclear Experimental Reactor (ITER) design team in its selection of ceramics as the first option for the ITER breeder material. Blanket design studies have indicated properties in the candidate materials data base that need further investigation. Current studies are focusing on tritium release behavior at high burn-up, changes in thermophysical properties with burn-up, compatibility between the ceramic breeder and beryllium multiplier, and phase changes with burn-up. Laboratory and in-reactor tests, some as part of an international collaboration for development of ceramic breeder materials, are underway. C1 UNIV TOKYO,TOKYO 113,JAPAN. KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. RP JOHNSON, CE (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 136 TC 12 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 127 EP 139 DI 10.1016/0920-3796(91)90188-V PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300012 ER PT J AU PENZHORN, RD ANDERSON, J HAANGE, R HIRCQ, B MEIKLE, A NARUSE, Y AF PENZHORN, RD ANDERSON, J HAANGE, R HIRCQ, B MEIKLE, A NARUSE, Y TI TECHNOLOGY AND COMPONENT DEVELOPMENT FOR A CLOSED TRITIUM CYCLE SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE ID STORAGE; ZRCO AB A brief survey on recent advances in the field of tritium technology concerning the most important systems of the fuel cycle of a fusion reactor, i.e. the plasma exhaust pumping system, the exhaust gas clean up system, the isotope separation system, the tritium storage facility and the tritium extraction from a blanket is provided. Experimental results, single component developments, and technical tests including those with relevant amounts of tritium that constitute the basis of proposed integral process concepts are described. C1 ATOM ENERGY COMMISS,CTR ETUD BRUYERES CHATEL,F-91680 BRUYERES CHATEL,FRANCE. CANADIAN FUS FUELS TECHNOL PROJECT,MISSISSAUGA L5J 1K3,ONTARIO,CANADA. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. JET,JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. JAPAN ATOM ENERGY RES INST,TRITIUM ENGN LAB,TOKAI,IBARAKI 31911,JAPAN. RP PENZHORN, RD (reprint author), KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST RADIOCHEM,TRITIUM LAB KARLSRUHE,POSTFACH 3640,W-7500 KARLSRUHE 1,GERMANY. NR 49 TC 10 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 141 EP 157 DI 10.1016/0920-3796(91)90189-W PG 17 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300013 ER PT J AU WONG, KY HIRCQ, B JALBERT, RA SHMAYDA, WT AF WONG, KY HIRCQ, B JALBERT, RA SHMAYDA, WT TI TRITIUM DECONTAMINATION OF MACHINE COMPONENTS AND WALLS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE ID TYPE-316 STAINLESS-STEEL; SURFACE; CONTAMINATION; SORPTION; CARBON AB Tritium decontamination techniques for machine components and their application at tritium handling facilities are reviewed. These include commonly used methods such as vacuuming, purging, thermal desorption and isotopic exchange as well as less common methods such as chemical/electrochemical etching, plasma discharge cleaning, and destructive methods. Problems associated with tritium contamination of walls and use of protective coatings are reviewed. Tritium decontamination considerations at fusion facilities are discussed. C1 CEA,CTR BRUYERES CHATEL,DETN,F-91680 BRUYERES CHATEL,FRANCE. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. ONTARIO HYDRO,TORONTO M8Z 5S4,ONTARIO,CANADA. RP WONG, KY (reprint author), CANADIAN FUS FUELS TECHNOL PROJECT,2700 LAKESHORE RD W,MISSISSAUGA L5J 1K3,ONTARIO,CANADA. NR 39 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 159 EP 172 DI 10.1016/0920-3796(91)90190-2 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300014 ER PT J AU DAENNER, W ELGUEBALY, L SAWAN, M GOHAR, Y MAKI, K RADO, V SCHCHIPAKIN, O ZIMIN, S AF DAENNER, W ELGUEBALY, L SAWAN, M GOHAR, Y MAKI, K RADO, V SCHCHIPAKIN, O ZIMIN, S TI NEUTRON SHIELDING AND ITS IMPACT ON THE ITER MACHINE-DESIGN SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE AB This paper describes the efforts made in the frame of the ITER project to analyze the shielding of the superconducting magnets. First, the radiation limits to be achieved are specified as well as the neutron source in terms of wall loading on the first wall of the machine. Then the general shield concept is explained, including the most essential details of the various shield components. A brief section is devoted to the calculational tools, the data base, and the safety factors to be applied to the results obtained. The neutronics models of four different configurations are summarized as they were used to study the most critical parts of the machine. This section is followed by a presentation of the most important results from one-, two- and three-dimensional calculations. They are given for both the reference design and an improved one in which the critical regions are reinforced with respect to their shielding capability. It is concluded that the ITER shield layout just marginally meets the stated limits provided that some tungsten in included in the critical regions. A slight revision of the overall machine dimensions with the aim to achieve a less complex shield and a higher margin with respect to the limits is, however, seen the better solution. C1 ENEA FUS,ASSOC EURATOM,CTR RIC ENERGIA FRASCATI,I-00044 FRASCATI,ITALY. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,USSR. UNIV WISCONSIN,INST FUS TECHNOL,MADISON,WI 53706. ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. JAPAN ATOM ENERGY RES INST,NAKA FUS RES ESTAB,FUS EXPTL REACTOR TEAM,NAKA,IBARAKI,JAPAN. RP DAENNER, W (reprint author), MAX PLANCK INST PLASMA PHYS,NET TEAM,BOLTZMANNSTR 2,W-8046 GARCHING,GERMANY. NR 23 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 183 EP 193 DI 10.1016/0920-3796(91)90192-S PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300016 ER PT J AU HONDA, T LOUSTEAU, D MAISONNIER, D SADAKOV, S SHIBANUMA, K AF HONDA, T LOUSTEAU, D MAISONNIER, D SADAKOV, S SHIBANUMA, K TI PHILOSOPHY AND CONCEPTS FOR ITER MAINTENANCE SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE AB The Assembly and Maintenance (A&M) System is the complete set of personnel, equipment, and procedures required to successfully assembly and maintain the International Thermonuclear Experimental Reactor (ITER) components into a reactor capable of operation in the prescribed manner. It is composed of the complete collection of general and special purpose tools and their operating procedures, required for the assembly and maintenance of the ITER device. Included are the reactor specific auxiliary equipment (such as vacuum pumps and heating systems) directly coupled to the reactor and required for its operation. Also included are special facilities, including tools and fixtures, required for preassembly, inspection, disassembly, repair, or testing of components prior to delivery and final assembly. The A&M system operated within an envelope bounded by the plant confinement/containment system. It must have access to all reactor external and internal surface as required to perform its functions. Access to in-vessel components shall be primarily through the four designated maintenance ports located on the machine equatorial plane. Other ports, such as the the top vertical port, can be used for maintenance; however, their use shall be limited to less frequent or unplanned operations such as the change-out of internal shielding or blankets. C1 DV EFREMOV ELECTROPHYS APPARATUS RES INST,LENINGRAD 189631,USSR. OAK RIDGE NATL LAB,CTR FUS ENGN DESIGN,OAK RIDGE,TN 37831. MAX PLANCK INST PLASMA PHYS,NET TEAM,W-8046 GARCHING,GERMANY. RP HONDA, T (reprint author), JAPAN ATOM ENERGY RES INST,NAKA FUS RES ESTAB,NAKA,IBARAKI 31102,JAPAN. NR 4 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 205 EP 215 DI 10.1016/0920-3796(91)90194-U PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300018 ER PT J AU DIETZ, KJ CHAPPUIS, P HORIIKE, H JACKSON, GL ULRICKSON, M AF DIETZ, KJ CHAPPUIS, P HORIIKE, H JACKSON, GL ULRICKSON, M TI EXPERIENCE WITH HIGH HEAT-FLUX COMPONENTS IN LARGE TOKAMAKS SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON FUSION NUCLEAR TECHNOLOGY ( ISFNT-2 ) CY JUN 02-07, 1991 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, INTERATOM, KRAFTANLAGAN AG, NOELL, DR TRIPPE INGENIEURGESELL, NUCL RES CTR KARLSRUHE ID LIMITER; JT-60; PLASMAS; JET AB The large present-day tokamaks i.e. JET, TFTR, JT-60, DIII-D, and Tore Supra are machines capable of sustaining plasma currents of several million amperes. Pulse durations range from a few seconds up to a minute. These large machines have been in operation for several years and there exists wide experience with materials for plasma facing components. Bare and coated metals, bare and coated graphites and beryllium were used for walls, limiters and divertors. High heat flux components are mainly radiation cooled, but stationary cooling for long pulse duration is also employed. This paper summarizes the experience gained in the large machines with respect to material selection, component design, problem areas, and plasma performance. C1 CEN CADARACHE,F-13108 ST PAUL DURANCE,FRANCE. JAPAN ATOM ENERGY RES INST,NAKA FUS RES ESTAB,NAKA,IBARAKI 31101,JAPAN. GEN ATOM,SAN DIEGO,CA 92186. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP DIETZ, KJ (reprint author), JET,JOINT UNDERTAKING,ABINGDON OX14 3EA,ENGLAND. NR 49 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 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD DEC PY 1991 VL 16 BP 229 EP 251 DI 10.1016/0920-3796(91)90196-W PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HB283 UT WOS:A1991HB28300020 ER PT J AU YAMANISHI, T ENOEDA, M OKUNO, K HAYASHI, T AMANO, J NARUSE, Y SHERMAN, RH AF YAMANISHI, T ENOEDA, M OKUNO, K HAYASHI, T AMANO, J NARUSE, Y SHERMAN, RH TI EXPERIMENTAL-STUDY FOR SEPARATION CHARACTERISTICS OF CRYOGENIC DISTILLATION-COLUMNS WITH AN H-D-T SYSTEM SO FUSION TECHNOLOGY LA English DT Article DE CRYOGENIC DISTILLATION; TRITIUM ID SMALL INNER DIAMETER; ISOTOPE-SEPARATION AB Cryogenic distillation experiments have been performed with an H-D-T system (1.5 g of tritium) by using two columns with different inner diameters (1 and 2 cm) and different size packings (a 3-mm Dixon ring for the larger column and a 1.5-mm Dixon ring for the smaller column). The height equivalent to a theoretical plate (HETP) values measured during total reflux operation ranged from 4 to 6 cm for both columns and showed no apparent dependence on vapor velocities. The HETP values under total recycle operation, which varied from 3 to 6 cm, gradually decreased with increasing reflux ratios. The feed flow rates also had influenced the HETP. Consequently, the HETP values were correlated by the flow rates of the feed and vapor streams of the column and by the reflux ratio. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP YAMANISHI, T (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. NR 8 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 DEC PY 1991 VL 20 IS 4 BP 419 EP 424 PN 1 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR273 UT WOS:A1991GR27300005 ER PT J AU STORMS, E AF STORMS, E TI REVIEW OF EXPERIMENTAL-OBSERVATIONS ABOUT THE COLD FUSION EFFECT SO FUSION TECHNOLOGY LA English DT Review DE COLD FUSION; REVIEW; EXPERIMENTAL ID HEAVY-WATER ELECTROLYSIS; DEUTERIUM-DEUTERIUM FUSION; TEMPERATURE NUCLEAR-FUSION; A-AND-M; NEUTRON EMISSION; PALLADIUM-DEUTERIUM; BARRIER PENETRATION; TRITIUM PRODUCTION; CHARGED-PARTICLES; CONDENSED MATTER AB The experimental literature describing the cold fusion phenomenon is reviewed. The number and variety of careful experimental measurements of heat, tritium, neutron, and helium production strongly support the occurrence of nuclear reactions in a metal lattice near room temperature as proposed by Pons and Fleischmann and independently by Jones. RP STORMS, E (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, DIV NUCL MAT TECHNOL, MS C348, LOS ALAMOS, NM 87545 USA. NR 510 TC 58 Z9 59 U1 2 U2 17 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 DEC PY 1991 VL 20 IS 4 BP 433 EP 477 PN 1 PG 45 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR273 UT WOS:A1991GR27300007 ER PT J AU COLLINS, C KUO, WL SEGRAVES, R FUSCOE, J PINKEL, D GRAY, JW AF COLLINS, C KUO, WL SEGRAVES, R FUSCOE, J PINKEL, D GRAY, JW TI CONSTRUCTION AND CHARACTERIZATION OF PLASMID LIBRARIES ENRICHED IN SEQUENCES FROM SINGLE HUMAN-CHROMOSOMES SO GENOMICS LA English DT Article ID INSITU HYBRIDIZATION; DNA LIBRARIES; ABERRATIONS; CLONING C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. FU NCI NIH HHS [CA-45919]; NICHD NIH HHS [HD-17665] NR 26 TC 228 Z9 233 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD DEC PY 1991 VL 11 IS 4 BP 997 EP 1006 DI 10.1016/0888-7543(91)90025-A PG 10 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA GR016 UT WOS:A1991GR01600025 PM 1783406 ER PT J AU CARRIGAN, CR KING, GCP BARR, GE BIXLER, NE AF CARRIGAN, CR KING, GCP BARR, GE BIXLER, NE TI POTENTIAL FOR WATER-TABLE EXCURSIONS INDUCED BY SEISMIC EVENTS AT YUCCA MOUNTAIN, NEVADA SO GEOLOGY LA English DT Article ID HYDRAULIC CONDUCTIVITY AB The possibility that 100-200 m changes in water-table elevation can be mechanically induced by earthquakes is a consideration in site studies of a potential high-level nuclear waste repository at Yucca Mountain, Nevada. However, numerical simulations of tectonohydrologic coupling involving earthquakes typical of the Basin and Range province produce 2-3 m excursions of a water table that is 500 m below the land surface. Even displacements corresponding to extraordinary seismic events drive water-table excursions of less than 20 m. Flow resulting from earthquake-induced pore-pressure fields below the water table tends to be mainly horizontal; vertical flows that cause changes of the level of the water table are secondary. Strongly anisotropic permeability, intended to enhance vertical flow within fault zones, only doubles water-table rise in the models considered. These simulations of water-table rise compare well with observations following large earthquakes in the Basin and Range. Our models suggest that exceptional hydrologic and/or tectonic conditions would be required to produce substantially larger water-table rises. C1 INST PHYS GLOBE STRASBOURG, F-67084 STRASBOURG, FRANCE. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP CARRIGAN, CR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB, DEPT EARTH SCI L-206, LIVERMORE, CA 94550 USA. NR 21 TC 26 Z9 26 U1 0 U2 3 PU GEOLOGICAL SOC AMER, INC PI BOULDER PA PO BOX 9140, BOULDER, CO 80301-9140 USA SN 0091-7613 J9 GEOLOGY JI Geology PD DEC PY 1991 VL 19 IS 12 BP 1157 EP 1160 DI 10.1130/0091-7613(1991)019<1157:PFWTEI>2.3.CO;2 PG 4 WC Geology SC Geology GA GU006 UT WOS:A1991GU00600003 ER PT J AU BERRYMAN, JG MILTON, GW AF BERRYMAN, JG MILTON, GW TI EXACT RESULTS FOR GENERALIZED GASSMANN EQUATIONS IN COMPOSITE POROUS-MEDIA WITH 2 CONSTITUENTS SO GEOPHYSICS LA English DT Article ID LONG-WAVELENGTH PROPAGATION; THERMAL-EXPANSION; ELASTIC MEDIA; FLUID; INCLUSIONS; WAVES AB Wave propagation in fluid-filled porous media is governed by Biot's equations of poroelasticity. Gassmann's relation gives an exact formula for the poroelastic parameters when the porous medium contains only one type of solid constituent. The present paper generalizes Gassmann's relation and derives exact formulas for two elastic parameters needed to describe wave propagation in a conglomerate of two porous phases. The parameters were first introduced by Brown and Korringa when they derived a generalized form of Gassmann's equation for conglomerates. These elastic parameters are the bulk modulus K(s) associated with changes in the overall volume of the conglomerate and the bulk modulus K(phi) associated with the pore volume when the fluid pressure (p(f)) and confining pressure (p) are increased, keeping the differential pressure (P(d) = p - p(f) fixed. These moduli are properties of the composite solid frame (drained of fluid) and are shown here to be completely determined in terms of the bulk moduli associated with the two solid constituents, the bulk moduli of the drained conglomerate and the drained phases, and the porosities in each phase. The pore structure of each phase is assumed uniform and smaller than the grain size in the conglomerate. The relations found are completely independent of the pore microstructure and provide a means of analyzing experimental data. The key idea leading to the exact results is this: Whenever two scalar fields (in our problem p(f) and p(d) can be independently varied in a linear composite containing only two constituents, there exists a special value gamma of the increment ratio for these two fields corresponding to an overall expansion or contraction of the medium with no change of relative shape. This fact guarantees that a set of consistency relations exists along the constituent moduli and the effective moduli, which then determines all but one of the effective constants. Thus, K(s) and K(phi) are determined in terms of the drained frame modulus K and the constituents' moduli. Because the composite is linear, the coefficients found for the special value of the increment ratio are also the exact coefficients for an arbitrary ratio. Since modulus K is commonly measured while the other two are not, these exact relations provide a significant advance in our ability to predict the response of porous materials to pressure changes. It is also shown that additional results (such as rigorous bounds on the parameters) may be easily obtained by exploiting an analogy between the equations of thermoelasticity and those of poroelasticity. The method used to derive these results may also be used to find exact expressions for three component composite porous materials when thermoelastic constants of the components and the composite are known. C1 NYU, COURANT INST MATH SCI, NEW YORK, NY 10012 USA. RP UNIV CALIF LAWRENCE LIVERMORE NATL LAB, GEOPHYS IMAGING & ANAL GRP, POB 808 L-202, LIVERMORE, CA 94550 USA. RI Berryman, James/A-9712-2008 NR 32 TC 92 Z9 97 U1 0 U2 0 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 USA SN 0016-8033 EI 1942-2156 J9 GEOPHYSICS JI Geophysics PD DEC PY 1991 VL 56 IS 12 BP 1950 EP 1960 DI 10.1190/1.1443006 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GU847 UT WOS:A1991GU84700003 ER PT J AU WENTZ, CA BASLER, F AF WENTZ, CA BASLER, F TI THE DECHLORINATION OF USED OIL PRODUCTS SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB More than 1.3 billion gallons of used lubricants are generated in the United States annually, but only about 67 million gallons reach recyclers to be re-refined into clean lubricants. The rest is burned as a fuel or disposed of. Annually, almost 500 million gallons of used lubricating oil are injected directly into the environment through landfills or disposed of by other methods. Because there is always a need to produce cleaner, higher quality oils from used oil recycling processes, the main objective of this study was to produce a low-chloride product from various used oil sources. The effect of processing conditions on the removal of chlorides from organic and inorganic components in the oil was also studied. This study has shown that, by the innovative use of chemical and thermal treatment, a high-quality fuel oil can be obtained from a wide variety of used oil sources. Satisfactory dechlorination and ash removal from waste oil is optimized when each step influences a following step, leading to improved chloride removal. The chemical treatment destabilizes the chlorine compounds in the waste oil. Dechlorination is achieved only to the degree to which chlorides present in the waste oil are precipitated or converted to low-boiling-point compounds that can be distilled in a vapor phase. The chlorinated organic impurities are reduced to hydrogen chloride and other chlorides. Residual chloride content in the oil is derived from organic and other dissolved compounds that remain stable throughout treatment. Treatment at temperatures in the range of 250-degrees-C destabilizes chloride compounds so that they split off hydrogen chloride at an increasing rate up to approximately 350-degrees-C. If the hydrogen chloride is not removed from the oil mixture, the reaction is partially reversible and dechlorination is only partially effective. This new process offers greater flexibility for a broad range of feedstocks and optimal separation and removal of the chlorinated light ends. The highly efficient removal of ash residues in the used oil should make this process attractive, where minimal waste production is an important regulatory and economic consideration. As more stringent air-quality regulations are imposed on industrial fuel oil burning, the need for low-ash, high-quality fuel oils from this process should offer economic advantages in the marketing of recycled used oil. RP WENTZ, CA (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 2 Z9 2 U1 2 U2 5 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0882-5696 J9 HAZARD WASTE HAZARD JI Hazard. Waste Hazard. Mater. PD WIN PY 1991 VL 8 IS 1 BP 55 EP 68 DI 10.1089/hwm.1991.8.55 PG 14 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FG395 UT WOS:A1991FG39500005 ER PT J AU JANSSEN, I STEBBINGS, JH ESSLING, MA DIMINO, KM RODGERS, DL AF JANSSEN, I STEBBINGS, JH ESSLING, MA DIMINO, KM RODGERS, DL TI PREDICTION OF RN-222 FROM TOPOGRAPHY IN PENNSYLVANIA SO HEALTH PHYSICS LA English DT Article ID RADON; HOMES AB The relationships of Rn levels in basements and first floors of homes to topographic location in a northeastern ridge and valley section of Pennsylvania were investigated. Topographic variables relating to elevation and slope were quantified and related to house Rn levels using both conventional and classification and regression tree (CART) analyses. The original interest was in using topographic correlates to estimate missing values in epidemiologic studies. In this area, Rn levels are usefully predicted by relative and absolute elevations and nearness to hills and ridges. Three- to fourfold differences in geometric mean Rn levels can be obtained for categories representing significant portions of the population of houses. The relationship of first-floor to basement Rn levels was found to be curvilinear and modestly affected by topography. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. OAKTON COMMUNITY COLL, DES PLAINES, IL 60016 USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD DEC PY 1991 VL 61 IS 6 BP 775 EP 783 DI 10.1097/00004032-199112000-00008 PG 9 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA GT922 UT WOS:A1991GT92200008 PM 1955323 ER PT J AU DIETZ, ML HORWITZ, EP NELSON, DM WAHLGREN, M AF DIETZ, ML HORWITZ, EP NELSON, DM WAHLGREN, M TI AN IMPROVED METHOD FOR DETERMINING SR-89 AND SR-90 IN URINE SO HEALTH PHYSICS LA English DT Note ID EXTRACTION; STRONTIUM AB A method has been developed for the rapid isolation and quantitation of Sr-89 and Sr-90 in urine samples. The radiostrontium is concentrated from the bulk urine sample by coprecipitation with calcium phosphate. The precipitate is then wet ashed with nitric acid, and a solution of the resulting residue in 2 M HNO3-0.5 M Al(NO3)3 is passed through an extraction chromatographic column containing a supported crown ether that preferentially retains strontium. Sorbed strontium may then be eluted from the column with either dilute HNO3 or water and counted via liquid scintillation. A new counting scheme that permits quantitation of both Sr-89 and Sr-90 on the same day the separation is performed is described. C1 ARGONNE NATL LAB, DEPT ENVIRONM SAFETY & HLTH, 9700 S CASS AVE, ARGONNE, IL 60439 USA. ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 20 TC 46 Z9 47 U1 0 U2 9 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD DEC PY 1991 VL 61 IS 6 BP 871 EP 877 DI 10.1097/00004032-199112000-00020 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA GT922 UT WOS:A1991GT92200020 PM 1955331 ER PT J AU TOOHEY, RE AF TOOHEY, RE TI ALIS ARE NOT MPBBS - REPLY SO HEALTH PHYSICS LA English DT Letter RP TOOHEY, RE (reprint author), ARGONNE NATL LAB, DIV ENVIRONM SAFETY & HLTH, ARGONNE, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD DEC PY 1991 VL 61 IS 6 BP 915 EP 915 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA GT922 UT WOS:A1991GT92200029 ER PT J AU CHIARIZIA, R HORWITZ, EP AF CHIARIZIA, R HORWITZ, EP TI NEW FORMULATIONS FOR IRON-OXIDES DISSOLUTION SO HYDROMETALLURGY LA English DT Article ID COORDINATION CHEMISTRY; ACIDIC SOLUTIONS; METAL-OXIDES; KINETICS; GOETHITE AB The dissolution of Fe-59-labelled synthetic goethite, alpha-FeOOH, has been studied in solutions of mineral (HCl, HNO3, H2SO4) and organic acids, belonging to the families of carboxylic and diphosphonic acids, alone, or in the presence of reducing agents. The data have been interpreted with a first-order rate law, although the shrinking core dissolution rate law has been shown to apply generally. The effect of several reducing agents on the rate of dissolution of alpha-FeOOH by inorganic and organic acids has been measured. Very high accelerations of the dissolution process were exhibited by ascorbic acid, sodium dithionite and sodium formaldehydesulfoxylate. In particular, the mixture of 1-hydroxyethane-1,1-diphosphonic acid and sodium formaldehydesulfoxylate proved to be extremely effective for alpha-FeOOH dissolution even at room temperature. RP CHIARIZIA, R (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 36 TC 39 Z9 40 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-386X J9 HYDROMETALLURGY JI Hydrometallurgy PD DEC PY 1991 VL 27 IS 3 BP 339 EP 360 DI 10.1016/0304-386X(91)90058-T PG 22 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA GX535 UT WOS:A1991GX53500006 ER PT J AU CARLSTEN, BE YOUNG, LM JONES, ME THODE, LE LUMPKIN, AH FELDMAN, DW FELDMAN, RB BLIND, B BROWMAN, MJ OSHEA, PG AF CARLSTEN, BE YOUNG, LM JONES, ME THODE, LE LUMPKIN, AH FELDMAN, DW FELDMAN, RB BLIND, B BROWMAN, MJ OSHEA, PG TI DESIGN AND ANALYSIS OF EXPERIMENTAL PERFORMANCE OF THE LOS-ALAMOS HIBAF FACILITY ACCELERATOR USING THE INEX COMPUTER-MODEL SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ELECTRON; SIMULATIONS AB In this paper we review the accelerator design of the high brightness accelerator FEL (HIBAF) at Los Alamos National Laboratory and analyze its actual performance. HIBAF is the first high-brightness high-current (several hundred amperes) accelerator built using a photoelectric injector. We discuss the design philosophy and the integrated numerical experiment (INEX) design tool, and describe the accelerator components. Currently, the machine has only been operated at intermediate energies near 15 MeV. We use the INEX computer code package to examine the accelerator performance by comparing the measurements with simulations at that energy. The accelerator should be able to reach the design goal of 300 A current with the normalized 90% transverse emittance of less than 50-pi-mm mrad for a 5 nC bunch after reaching the final energy of 40 MeV. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV ACCELERATOR TECHNOL,THEORY & SIMILAT GRP,LOS ALAMOS,NM 87544. RP CARLSTEN, BE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV ACCELERATOR TECHNOL,FREE ELECTRON LASER PROGRAM,LOS ALAMOS,NM 87544, USA. NR 24 TC 16 Z9 16 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2580 EP 2597 DI 10.1109/3.104137 PG 18 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700013 ER PT J AU DOWELL, DH LAUCKS, ML LOWREY, AR ADAMSKI, JL PISTORESI, DJ SHOFFSTALL, DR BENTZ, MP BURNS, RH GUHA, J SUN, KC TOMITA, W LUMPKIN, AH BENDER, SC BYRD, D TOKAR, RL AF DOWELL, DH LAUCKS, ML LOWREY, AR ADAMSKI, JL PISTORESI, DJ SHOFFSTALL, DR BENTZ, MP BURNS, RH GUHA, J SUN, KC TOMITA, W LUMPKIN, AH BENDER, SC BYRD, D TOKAR, RL TI TESTS OF A GRAZING-INCIDENCE RING RESONATOR FREE-ELECTRON LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID SIMULATIONS AB The Boeing free-electron laser (FEL) optical cavity has been changed from a simple concentric cavity using two spherical mirrors to a larger grazing-incidence ring resonator. The new resonator consists of two mirror telescopes located at each end of the wiggler with a round-trip path length of approximately 133 m. Each telescope is a grazing-incidence hyperboloid followed by a normal-incidence paraboloid. Initial tests showed that poorly positioned ring focus and unreliable pointing alignment resulted in reduced and structured FEL output. (First lasing operation occurred on March 23 and 24, 1990.) Later efforts concentrated on improving the resonator alignment techniques and lowering the single-pass losses. FEL performance and reliability have significantly improved due to better ring alignment. The alignment procedure and recent lasing results are described. The effect the electron beam has on lasing is also discussed. Measurements are presented showing how FEL temporal output and wavelength are sensitive to electron beam energy variations. C1 ROCKWELL INT CORP,DIV ROCKETDYNE,CANOGA PK,CA 91305. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP DOWELL, DH (reprint author), BOEING CO,DIV AEROSP & ELECTR,FREE ELECTRON LASER FACIL,SEATTLE,WA 98124, USA. NR 16 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2613 EP 2625 DI 10.1109/3.104140 PG 13 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700016 ER PT J AU FELDMAN, DW BENDER, SC CARLSTEN, BE EARLY, J FELDMAN, RB JOHNSON, WJD LUMPKIN, AH OSHEA, PG STEIN, WE SHEFFIELD, RL YOUNG, LM AF FELDMAN, DW BENDER, SC CARLSTEN, BE EARLY, J FELDMAN, RB JOHNSON, WJD LUMPKIN, AH OSHEA, PG STEIN, WE SHEFFIELD, RL YOUNG, LM TI EXPERIMENTAL RESULTS FROM THE LOS-ALAMOS FEL PHOTOINJECTOR SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID FREE-ELECTRON LASER; HIBAF FACILITY AB We report here on some initial measurements of e-beam properties from the new photoinjector installed as the front end on the Los Alamos free-electron laser (FEL). The FEL is being rebuilt with the photoinjector, added acceleration to 40 MeV, new diagnostics, and a beam line designed to minimize emittance growth. We have measured the spatial and temporal properties of the beam at energies of about 15 MeV as a function of several parameters and the results have been compared to simulations. The operational characteristics of the important elements of the system and the theoretical comparisons will be described in this and companion papers. RP FELDMAN, DW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV ACCELERATOR TECHNOL,FREE ELECTRON LASER PROGRAM,LOS ALAMOS,NM 87544, USA. NR 17 TC 30 Z9 30 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2636 EP 2643 DI 10.1109/3.104143 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700019 ER PT J AU EARLY, J BARTON, J WENZEL, R REMELIUS, D BUSCH, G AF EARLY, J BARTON, J WENZEL, R REMELIUS, D BUSCH, G TI THE LOS-ALAMOS FEL PHOTOINJECTOR DRIVE LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article AB The drive laser system of the photoelectric injector for the Los Alamos free-electron laser (FEL) is described. This system consists of a 1.053-mu-m mode-locked Nd: YLF oscillator, a grating-rhomb pulse compressor, a fast electrooptic shutter to reduce pulse repetition frequency, a pulsed Nd: YLF amplifier chain, and a KTP frequency doubler. The bright electron beams required for high performance FEL's demand stringent specifications on drive laser output levels, beam quality, and stability. The design specifications, laser architecture, and operating performance following the most recent round of upgrades are presented. RP EARLY, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87544, USA. NR 10 TC 5 Z9 6 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2644 EP 2649 DI 10.1109/3.104144 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700020 ER PT J AU ELLIOTT, CJ AF ELLIOTT, CJ TI GENERALIZED ELECTRON-BEAM MATCHING IN THE FREE-ELECTRON LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article AB Three matching schemes are presented for Gaussian profile electron beams in free-electron lasers (FEL's). The new schemes are distinct generalizations of well-known betatron matching and include ribbon profiles. The corresponding effective energy distributions and their Fourier transforms are obtained in analytical form. An analytical kernel produces the key Fredholm integral equation that solves the initial value problem. RP ELLIOTT, CJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2667 EP 2672 DI 10.1109/3.104147 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700023 ER PT J AU PING, Z CHENG, J SCHAUS, CF SUN, SZ KOPCHIK, D HAINS, C HSIN, W CHEN, CH MYERS, DR VAWTER, GA OLBRIGHT, GR BRYAN, RP AF PING, Z CHENG, J SCHAUS, CF SUN, SZ KOPCHIK, D HAINS, C HSIN, W CHEN, CH MYERS, DR VAWTER, GA OLBRIGHT, GR BRYAN, RP TI LOW SERIES RESISTANCE CONTINUOUSLY GRADED MIRROR MULTIPLE QUANTUM-WELL VERTICAL-CAVITY SURFACE-EMITTING LASERS GROWN BY MOCVD SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. NR 3 TC 1 Z9 1 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD DEC PY 1991 VL 38 IS 12 BP 2697 EP 2698 DI 10.1109/16.158713 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GP300 UT WOS:A1991GP30000036 ER PT J AU OLBRIGHT, GR BRYAN, RP FU, WS APTE, R BLOOM, DM AF OLBRIGHT, GR BRYAN, RP FU, WS APTE, R BLOOM, DM TI HETERODYNE MEASUREMENT OF LINEWIDTH, TUNABILITY, AND FREQUENCY-SYNTHESIS OF VERTICAL-CAVITY SURFACE-EMITTING LASER DIODE-ARRAYS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. STANFORD UNIV,GINZTON LAB,STANFORD,CA 94305. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD DEC PY 1991 VL 38 IS 12 BP 2698 EP 2699 DI 10.1109/16.158714 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GP300 UT WOS:A1991GP30000038 ER PT J AU MARTENS, JS HIETALA, VM ZIPPERIAN, TE GINLEY, DS TIGGES, CP PHILLIPS, JM AF MARTENS, JS HIETALA, VM ZIPPERIAN, TE GINLEY, DS TIGGES, CP PHILLIPS, JM TI S-PARAMETER MEASUREMENTS AND MICROWAVE APPLICATIONS OF SUPERCONDUCTING FLUX FLOW TRANSISTORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article; Proceedings Paper CT INTERNATIONAL MICROWAVE SYMP CY JUN 10-14, 1991 CL BOSTON, MA SP IEEE, MICROWAVE THEORY & TECH SOC ID TC MATERIALS; THIN-FILMS; DEVICES AB We have performed microwave two-port S-parameter measurements and modeling on superconducting flux flow transistors. These transistors, based on the magnetic control of flux flow in an array of high temperature superconducting weak links, can exhibit significant available power gain at microwave frequencies (over 20 dB at 7-10 GHz in some devices). The input impedance is largely inductive while the output impedance is both resistive and inductive. The characteristics are such that these devices are useful in numerous applications including matched amplifiers, phase shifters and active impedance convertors. C1 SANDIA NATL LABS,DIV ADV MAT,ALBUQUERQUE,NM 87185. AT&T BELL LABS,THIN FILM RES GRP,MURRAY HILL,NJ 07974. RP MARTENS, JS (reprint author), SANDIA NATL LABS,DEPT 1140,CPD SEMICOND DEVICE RES GRP,ALBUQUERQUE,NM 87185, USA. NR 18 TC 24 Z9 24 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD DEC PY 1991 VL 39 IS 12 BP 2018 EP 2025 DI 10.1109/22.106541 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA GW458 UT WOS:A1991GW45800015 ER PT J AU FLEETWOOD, DM REBER, RA WINOKUR, PS AF FLEETWOOD, DM REBER, RA WINOKUR, PS TI EFFECT OF BIAS ON THERMALLY STIMULATED CURRENT (TSC) IN IRRADIATED MOS DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID SPACE ENVIRONMENTS; TRAPPED HOLES; X-RAY; RADIATION; CMOS; INTERFACE; DEFECTS; CHARGE; GATE; CAPACITORS AB We have investigated the electric-field dependence of thermally stimulated current (TSC) in irradiated MOS capacitors for TSC fields ranging from -3 MV/cm to +2 MV/cm. TSC measurements at negative bias following positive-bias irradiation provide useful estimates of the net oxide-trap charge, DELTA-Q(ot), if the TSC bias is large enough to overcome trapped-hole space-charge effects. Very little TSC is observed for positive-bias TSC following positive-bias irradiation. Under "proper" TSC bias conditions, TSC and C-V estimates of DELTA-Q(ot) agree well for thick, soft oxides, but differ significantly for thin, hard oxides. Differences between TSC and C-V estimates of DELTA-Q(ot) for thin, hard oxides are attributed to electron injection into the oxide and capture at trap sites associated with the radiation-induced trapped holes. We also show that TSC measurements can provide insight into the location of hole traps in MOS oxides that cannot be obtained from standard C-V tests. RP FLEETWOOD, DM (reprint author), SANDIA NATL LABS,DIV 2147,ALBUQUERQUE,NM 87185, USA. NR 43 TC 55 Z9 55 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1066 EP 1077 DI 10.1109/23.124076 PN 1 PG 12 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300003 ER PT J AU SANFORD, TWL BEUTLER, DE HALBLEIB, JA KNOTT, DP AF SANFORD, TWL BEUTLER, DE HALBLEIB, JA KNOTT, DP TI EXPERIMENTAL-VERIFICATION OF BREMSSTRAHLUNG PRODUCTION AND DOSIMETRY PREDICTIONS FOR 15.5 MEV ELECTRONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID 0.75 MEV ELECTRONS AB The radiation produced by a 15.5-MeV monoenergetic electron beam incident on optimized and non-optimized bremsstrahlung targets is characterized using the ITS Monte Carlo code and measurements with equilibrated and non-equilibrated TLD dosimetry. Comparisons between calculations and measurements verify the calculations and demonstrate that the code can be used to predict both bremsstrahlung production and TLD response for radiation fields that are characteristic of those produced by pulsed simulators of gamma rays. At optimum bremsstrahlung production, the predicted total forward radiation fluence detected in equilibrated TLD dosimetry agrees with that measured within the +/- 6% uncertainty of the measurement. The absolute comparisons made here provide independent confirmation of the validity of the TLD calibration for photon fields characteristic of gamma-ray simulators. The empirical Martin equation, which is often used to calculate radiation dose from optimized bremsstrahlung targets, is examined, and its range of validity is established from the data presented. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 24 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1160 EP 1170 DI 10.1109/23.124089 PN 1 PG 11 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300016 ER PT J AU BEUTLER, DE LORENCE, LJ BROWN, DB AF BEUTLER, DE LORENCE, LJ BROWN, DB TI DOSIMETRY IN LINAC ELECTRON-BEAM ENVIRONMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB The relationship between dose in TLDs to dose in packaged microelectronic devices as a function electron beam energy is calculated using the CEPXS/ONELD radiation transport code. The effects of adjacent materials, including TLDs, upon the energy deposition in the device are also discussed. Our calculations indicate that dosimetry errors for linac electron beam environments (electron energies > 12 MeV) can be made less than 5% if appropriate materials and geometries are used. The CEPXS/ONELD code provides a very powerful tool for dosimetry analysis in electron-beam environments. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BEUTLER, DE (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1171 EP 1179 DI 10.1109/23.124090 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300017 ER PT J AU KELLY, JG GRIFFIN, PJ LUERA, TF AF KELLY, JG GRIFFIN, PJ LUERA, TF TI USE OF SILICON BIPOLAR-TRANSISTORS AS SENSORS FOR NEUTRON ENERGY-SPECTRA DETERMINATIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB Recent reevaluation of the neutron displacement damage function for silicon qualifies it as a sensor for spectra determinations. This development is especially useful in the critical energy region from 0.2 to 2.0 MeV where, in the absence of fission foils, there is a shortage of response functions needed to define spectra satisfactorily. This paper describes how silicon bipolar devices can be used to improve neutron spectra determinations and therefore to better predict the displacement damage induced in devices. RP KELLY, JG (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 15 TC 6 Z9 6 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1180 EP 1186 DI 10.1109/23.124091 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300018 ER PT J AU SHANEYFELT, MR FLEETWOOD, DM SCHWANK, JR HUGHES, KL AF SHANEYFELT, MR FLEETWOOD, DM SCHWANK, JR HUGHES, KL TI CHARGE YIELD FOR CO-60 AND 10-KEV X-RAY IRRADIATIONS OF MOS DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID OXIDE-SEMICONDUCTOR DEVICES; INTERFACE-STATE GENERATION; CO-60 IRRADIATIONS; ENERGY-DEPENDENCE; TRAPPED CHARGE; RADIATION; TRANSISTORS; BUILDUP; FIELD; ENVIRONMENTS AB The radiation response of MOS devices exposed to Co-60 and low-energy (approximately 10 keV) x-ray irradiation is evaluated as a function of electric field during exposure. Improved charge yield estimates are obtained for Co-60 irradiations at fields below 1 MV/cm by matching voltage shifts due to oxide-trap and interface-trap charge to an E-0.55 electric field dependence. Combining these improved charge yield estimates and calculated dose enhancement factors, the relative response of x-ray to Co-60 irradiations is accurately predicted for oxide electric fields from 0.03 MV/cm to 5.0 MV/cm. The ability to predict the relative response of x-ray to Co-60 irradiations should speed acceptance of x-ray testers as a hardness assurance tool. RP SHANEYFELT, MR (reprint author), SANDIA NATL LABS,DIV 2147,ALBUQUERQUE,NM 87185, USA. NR 26 TC 104 Z9 111 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1187 EP 1194 DI 10.1109/23.124092 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300019 ER PT J AU SANFORD, TWL HALBLEIB, JA BEUTLER, DE MCATEE, WH MOCK, RC KNOTT, DP AF SANFORD, TWL HALBLEIB, JA BEUTLER, DE MCATEE, WH MOCK, RC KNOTT, DP TI PRODUCTION AND MEASUREMENT OF FLASH X-RAY DOSE-RATES IN EXCESS OF 1013RAD (CAF2)/S SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID PLANAR-ANODE DIODE; RADIATION AB The radiation field from an intense reusable source of flash x-rays that delivers a measured peak dose and dose rate of 370 +/- 60 krad (CaF2) and (3.5 +/- 0.7) X 10(13) rad (CaF2)/s over a useful area of 80 cm2 is characterized. CaF2:Mn TLDs (thermoluminescent dosimeters), which are used to measure the dose field, are shown to be dose-rate independent within +/- 15% up to this level. Energy deposition in the CaF2 TLD chip was analyzed according to the origin of the electrons responsible for that deposition with a new computational tool. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 22 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1195 EP 1202 DI 10.1109/23.124093 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300020 ER PT J AU GRIFFIN, PJ KELLY, JG LUERA, TF BARRY, AL LAZO, MS AF GRIFFIN, PJ KELLY, JG LUERA, TF BARRY, AL LAZO, MS TI NEUTRON DAMAGE EQUIVALENCE IN GAAS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID DISPLACEMENT DAMAGE; RADIATION-DAMAGE; GALLIUM-ARSENIDE; IRRADIATION; SPECTRUM AB A 1-MeV neutron damage equivalence methodology and damage function have been developed for GaAs based on a recoil-energy dependent damage efficiency and the displacement kerma. This method, developed using lifetime degradation in GaAs LEDs in a variety of neutron spectra, is also shown to be applicable to carrier removal. A validated methodology, such as this, is required to ensure and evaluate simulation fidelity in the neutron testing of GaAs semiconductors. C1 COMMUN RES CTR,OTTAWA K2H 852,ONTARIO,CANADA. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP GRIFFIN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87115, USA. NR 29 TC 22 Z9 22 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1216 EP 1224 DI 10.1109/23.124096 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300023 ER PT J AU MEISENHEIMER, TL FLEETWOOD, DM SHANEYFELT, MR RIEWE, LC AF MEISENHEIMER, TL FLEETWOOD, DM SHANEYFELT, MR RIEWE, LC TI 1/F NOISE IN N-CHANNEL AND P-CHANNEL MOS DEVICES THROUGH IRRADIATION AND ANNEALING SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID OXIDE-SEMICONDUCTOR TRANSISTORS; FIELD-EFFECT TRANSISTORS; INTERFACE STATES; TRAPPED CHARGE; RADIATION; DEFECTS AB We have investigated the 1/f noise of n- and p-channel MOS transistors through irradiation and biased anneals. While the increase in noise during irradiation is similar for both types of devices, the noise differs significantly in response to biased anneals. In particular, the noise decreases with decreasing DELTA-V(ot) during positive-bias anneals in nMOS transistors but increases during positive-bias anneals for pMOS transistors. Conversely, negative bias anneals increase the noise in nMOS devices but decrease the noise in pMOS devices. These results are explained in terms of majority carrier trapping and de-trapping at oxide defects near the Si/SiO2 interface. Under normal operating bias conditions (positive bias for nMOS and negative bias for pMOS), the 1/f noise of both n- and p-channel transistors decreases through post-irradiation annealing. RP MEISENHEIMER, TL (reprint author), SANDIA NATL LABS,DIV 2147,ALBUQUERQUE,NM 87185, USA. NR 25 TC 58 Z9 58 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1297 EP 1303 DI 10.1109/23.124108 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300035 ER PT J AU AXNESS, CL RIEWE, L REBER, RA LIANG, AY ANG, SS BROWN, WD AF AXNESS, CL RIEWE, L REBER, RA LIANG, AY ANG, SS BROWN, WD TI RADIATION CHARACTERISTICS OF SIPOS AND POLYSILICON RESISTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID POLYCRYSTALLINE AB The radiation characteristics of polysilicon and SIPOS resistors are compared. SIPOS is being considered as a replacement material for polysilicon in feedback resistors in rad-hard ICs. Both materials show little change in resistivity to gamma radiation and are much more neutron-radiation resistant than bulk silicon. C1 UNIV ARKANSAS,DEPT ELECT ENGN,FAYETTEVILLE,AR 72701. RP AXNESS, CL (reprint author), SANDIA NATL LABS,DIV 2147,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1365 EP 1369 DI 10.1109/23.124118 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300045 ER PT J AU WUNSCH, TF HASH, GL HEWLETT, FW TREECE, RK AF WUNSCH, TF HASH, GL HEWLETT, FW TREECE, RK TI TRANSIENT RADIATION HARDNESS OF THE CMOSV 1.25 MICRON TECHNOLOGY SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID MICROPROCESSOR AB Several devices fabricated in the AT&T/Sandia CMOSV 1.25-mu-m technology have been characterized for transient radiation hardness. Dose rate upset levels exceeding 10(9) rad(Si)/s were obtained on 16-bit microprocessor, 64K SRAM and 256K SRAM ICs. Experimental data on neutron irradiated parts is given. Secondary photocurrents are shown to exist in logic structures which do not have adequate p-well contact placement. Layout guidelines are developed which allow the IC designer to eliminate secondary photocurrents in a given design. RP WUNSCH, TF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1392 EP 1397 DI 10.1109/23.124122 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300049 ER PT J AU MURRAY, JR AF MURRAY, JR TI A 1K SHADOW RAM FOR CIRCUMVENTION APPLICATIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID RADIATION AB Circumvention applications require a memory that retains data through radiation (total dose and transient) and loss of power. Various memory technologies have been reviewed and none, as yet, can meet these requirements. However, if complementary metal oxide silicon (CMOS) and silicon nitride oxide silicon (SNOS) memories are combined in a shadow RAM (random access memory) configuration, the requirements can be fulfilled. RP MURRAY, JR (reprint author), SANDIA NATL LABS,DIV 2173,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 7 TC 1 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1403 EP 1409 DI 10.1109/23.124124 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300051 ER PT J AU KASCHMITTER, JL SHAEFFER, DL COLELLA, NJ MCKNETT, CL COAKLEY, PG AF KASCHMITTER, JL SHAEFFER, DL COLELLA, NJ MCKNETT, CL COAKLEY, PG TI OPERATION OF COMMERCIAL R3000 PROCESSORS IN THE LOW EARTH ORBIT (LEO) SPACE ENVIRONMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB Spacecraft processors must operate with minimal degradation of performance in the Low Earth Orbit (LEO) radiation environment, which includes the effects of total accumulated ionizing dose and Single Event Phenomena (SEP) caused by protons and cosmic rays. Commercially available microprocessors can offer a number of advantages relative to radiation-hardened devices, including lower cost, reduced development and procurement time, extensive software support, higher density and performance. However, commercially available systems are not normally designed to tolerate effects induced by the LEO environment. Lawrence Livermore National Laboratory (LLNL) and others have extensively tested the MIPS R3000 Reduced Instruction Set Computer (RISC) microprocessor family for operation in LEO environments. We have characterized total dose and SEP effects for altitudes and inclinations of interest to systems operating in LEO, and we postulate techniques for detection and alleviation of SEP effects based on experimental results. C1 JAYCOR INC,SANTA MONICA,CA. RP KASCHMITTER, JL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 10 Z9 12 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1415 EP 1420 DI 10.1109/23.124126 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300053 ER PT J AU SHAEFFER, DL KIMBROUGH, JR DENTON, SM KASCHMITTER, JL WILBURN, JW DAVIS, RW COLELLA, NJ HOLTKAMP, DB AF SHAEFFER, DL KIMBROUGH, JR DENTON, SM KASCHMITTER, JL WILBURN, JW DAVIS, RW COLELLA, NJ HOLTKAMP, DB TI HIGH-ENERGY PROTON SEU TEST-RESULTS FOR THE COMMERCIALLY AVAILABLE MIPS R3000-MICROPROCESSOR AND R3010 FLOATING POINT UNIT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID UPSET AB Proton single event upset (SEU) cross sections and proton total dose hardness of commercially available MIPS R3000 microprocessors (CPU) and R3010 floating point units (FPU) were obtained by exposing these parts to 256 MeV protons from the linear accelerator (LINAC) at the Los Alamos Meson Physics Facility (LAMPF). Parts from several manufacturers were tested. The CPUs and FPUs were tested dynamically during radiation exposure with specially designed assembly language codes which exercised a subset of the available instructions. Cross sections derived from the SEU data were used to calculate expected upset rates for a 500-km, 60-degree inclination, orbit during quiet solar conditions and during the August 4, 1972, King solar flare event [12, 13] modeled by Adams et al. [14]. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP SHAEFFER, DL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 13 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1421 EP 1428 DI 10.1109/23.124127 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300054 ER PT J AU SEXTON, FW CORBETT, WT TREECE, RK HASS, KJ HUGHES, KL AXNESS, CL HASH, GL SHANEYFELT, MR WUNSCH, TF AF SEXTON, FW CORBETT, WT TREECE, RK HASS, KJ HUGHES, KL AXNESS, CL HASH, GL SHANEYFELT, MR WUNSCH, TF TI SEU SIMULATION AND TESTING OF RESISTOR-HARDENED D-LATCHES IN THE SA3300-MICROPROCESSOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID CMOS; MICROPROCESSOR; DESIGN AB The SEU tolerance of the SA3300 microprocessor with feedback resistors is presented and compared to the SA3300 without feedback resistors and to the commercial version (NS32016). Upset threshold at room temperature increased from 23 MeV-cm2/mg with no feedback resistors to 60 MeV-cm2/mg and 180 MeV-cm2/mg with feedback resistors of 50 k-OMEGA and 160 k-OMEGA, respectively. The performance goal of 10 MHz over the full temperature range of -55-degrees-C to +125-degrees-C is exceeded for feedback resistors of 160 k-OMEGA and less. Error rate calculations for this design predict that the error rate is less than once every 100 years when 50 k-OMEGA feedback resistors are used in the D-latch design. Analysis of the SEU response using a lumped-parameter circuit simulator imply a charge collection depth of 4.5-mu-m. This is much deeper than we would expect for prompt collection in the epi and funnel regions and has been explained in terms of diffusion current in the heavily doped substrate. RP SEXTON, FW (reprint author), SANDIA NATL LABS,DIV 2147,ALBUQUERQUE,NM 87185, USA. NR 21 TC 24 Z9 24 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1521 EP 1528 DI 10.1109/23.124141 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300068 ER PT J AU FLEETWOOD, DM WINOKUR, PS MEISENHEIMER, TL AF FLEETWOOD, DM WINOKUR, PS MEISENHEIMER, TL TI HARDNESS ASSURANCE FOR LOW-DOSE SPACE APPLICATIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID TRAPPED HOLES; MOS DEVICES; POSTIRRADIATION RESPONSE; INTEGRATED-CIRCUITS; RADIATION HARDNESS; X-RAY; CMOS; ENVIRONMENTS; IRRADIATION; TRANSISTORS AB We present a method to conservatively estimate MOS hardness in space that shares the same technical basis as MIL-STD 883C, Test Method 1019.4, but permits greater latitude in part selection for low-dose space systems. Cobalt-60 irradiation at 50-300 rad(Si)/s followed by 25-degrees-C anneal is shown to provide an effective test of oxide-charge related failures at low dose rates that is considerably less conservative than Method 1019.4 For MOS devices with gate oxides thinner than 100 nm, we show that an elevated temperature "rebound test" generally is not required for systems with total dose requirements less than 5 krad(Si). For thicker gate oxides and/or higher-dose system requirements, rebound testing per Method 1019.4 generally is required to ensure that devices do not fail in space due to interface-trap effects. RP FLEETWOOD, DM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 36 TC 54 Z9 55 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1552 EP 1559 DI 10.1109/23.124145 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300072 ER PT J AU SCOFIELD, JH FLEETWOOD, DM AF SCOFIELD, JH FLEETWOOD, DM TI PHYSICAL BASIS FOR NONDESTRUCTIVE TESTS OF MOS RADIATION HARDNESS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID 1/F NOISE; TRANSISTORS; INTERFACE; CHARGE; DEFECTS; DEVICES; MOSFETS AB We have found that the 1/f noise and channel resistance of unirradiated nMOS transistors from a single lot with various gate-oxide splits closely correlate with the oxide-trap and interface trap charge, respectively, following irradiation. The 1/f noise is explained by a trapping model, while the variations in channel resistance are explained by scattering from interface-trap precursor defects. It appears that both noise and channel mobility measurements may be useful in defining nondestructive hardness assurance test methods for devices fabricated from a single technology. It may be difficult to use either for making cross-technology comparisons. Finally, during the course of this study it was found that process techniques that improve the radiation hardness of MOS devices at room temperature can greatly reduce the 1/f noise of MOS devices at cryogenic temperatures.* C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SCOFIELD, JH (reprint author), OBERLIN COLL,DEPT PHYS,OBERLIN,OH 44074, USA. NR 27 TC 43 Z9 45 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1567 EP 1577 DI 10.1109/23.124147 PN 1 PG 11 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300074 ER PT J AU SHANEYFELT, MR HUGHES, KL SCHWANK, JR SEXTON, FW FLEETWOOD, DM WINOKUR, PS ENLOW, EW AF SHANEYFELT, MR HUGHES, KL SCHWANK, JR SEXTON, FW FLEETWOOD, DM WINOKUR, PS ENLOW, EW TI WAFER-LEVEL RADIATION TESTING FOR HARDNESS ASSURANCE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID INTEGRATED-CIRCUITS; TRANSISTORS; MECHANISMS; DEPENDENCE AB To implement the Qualified Manufacturers List (QML) approach to hardness assurance in a practical and cost-effective manner, one must identify technology parameters that affect radiation hardness and bring them under statistical process control. To aid this effort, we have developed a wafer-level test system to map test-structure and IC response across a wafer. This system permits current-voltage and charge-pumping measurements on transistors, and high-frequency capacitance-voltage measurements on capacitors. For frequencies up to 50 MHz, the system provides a complete menu of functional and parametric IC tests. Wafer maps and histograms of test-structure and IC response are presented for a 1.2-mu-m radiation-hardened CMOS technology to illustrate the capabilities of the wafer-level test system. Statistical and "deterministic" approaches to correlate test structure and IC response are discussed for this technology. C1 MISSION RES CORP,ALBUQUERQUE,NM 87106. RP SHANEYFELT, MR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 24 Z9 24 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1598 EP 1605 DI 10.1109/23.124151 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300078 ER PT J AU BEUTLER, DE HALBLEIB, JA SANFORD, TWL FEHL, DL KNOTT, DP AF BEUTLER, DE HALBLEIB, JA SANFORD, TWL FEHL, DL KNOTT, DP TI DOSIMETRY CONSIDERATIONS FOR THE HIGH-ENERGY PHOTON ELECTRON ENVIRONMENT OF HERMES .3. IMPLICATIONS FOR EXPERIMENTS AND MODELING SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID 0.75 MEV ELECTRONS; SECONDARY ELECTRONS; DOSE ENHANCEMENT; PREDICTIONS; FIELD; BEAMS AB Measurements of energy deposition as a function of equilibrator thickness and position in the HERMES III radiation field are compared to ITS code predictions. These measurements demonstrate the combined photon/electron nature of the radiation field and the importance of the electron field in both measurements and calculations. C1 TECH SUPPORT CORP,ALBUQUERQUE,NM 87185. RP BEUTLER, DE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 29 TC 7 Z9 7 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1736 EP 1745 DI 10.1109/23.124170 PN 2 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ174 UT WOS:A1991GZ17400003 ER PT J AU GUNTHER, W SULLIVAN, K AF GUNTHER, W SULLIVAN, K TI DETECTING AND MITIGATING ROD DRIVE CONTROL-SYSTEM DEGRADATION IN WESTINGHOUSE PWRS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB A study of the effects of aging on the Westinghouse Control Rod Drive (CRD) System was performed as part of the U.S. NRC's Nuclear Plant Aging Research (NPAR) Program [1], [2]. For the study, the CRD system boundary includes the power and logic cabinets associated with the manual control rod movement, and the control rod mechanism itself. The aging-related degradation of the interconnecting cables and connectors and the rod-position-indicating system also were considered. This paper presents the results of that study pertaining to the electrical and instrumentation portions of the CRD system, including ways to detect and mitigate system degradation. RP GUNTHER, W (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,UPTON,NY 11973, USA. NR 3 TC 2 Z9 9 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1760 EP 1765 DI 10.1109/23.124173 PN 2 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ174 UT WOS:A1991GZ17400006 ER PT J AU GROSSMAN, MW SHEPP, TA AF GROSSMAN, MW SHEPP, TA TI PLASMA ISOTOPE-SEPARATION METHODS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID VACUUM-ARC CENTRIFUGE; MASS SEPARATION; ENRICHMENT AB Isotope separation has many important industrial, medical, and research applications. Large-scale processes have typically utilized complex cascade systems; for example, the gas centrifuge. Alternatively, high single-stage enrichment processes (as in the case of the calutron) are very energy intensive. Plasma-based methods being developed for the past 15 to 20 years have attempted to overcome these two drawbacks. In this review, six major types of isotope separation methods which involve plasma phenomena are discussed. These methods are: plasma centrifuge, AVLIS (atomic vapor laser isotope separation), ion wave, ICR (ion-cyclotron resonance), calutron, and gas discharge. The emphasis of this review is to describe the plasma phenomena in these major categories. An attempt was made to include enough references so that more detailed study or evaluation of a particular method could readily be pursued. A brief discussion of isotope separation using mass balance concepts is also carried out. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,ATOM VAPOR LASER ISOTOPE SEPARAT PROGRAM,LIVERMORE,CA 94550. RP GROSSMAN, MW (reprint author), GTE ELECT PROD,DANVERS,MA 01923, USA. NR 67 TC 34 Z9 34 U1 0 U2 14 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1991 VL 19 IS 6 BP 1114 EP 1122 DI 10.1109/27.125034 PG 9 WC Physics, Fluids & Plasmas SC Physics GA HD295 UT WOS:A1991HD29500010 ER PT J AU GITOMER, SJ JONES, RD AF GITOMER, SJ JONES, RD TI LASER-PRODUCED PLASMAS IN MEDICINE SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID PULSED DYE-LASER; PICOSECOND OPTICAL-BREAKDOWN; NEODYMIUM-YAG LASER; URINARY CALCULI; BILIARY CALCULI; ATHEROSCLEROTIC PLAQUE; CLINICAL-EXPERIENCE; SELECTIVE ABLATION; URETERAL CALCULI; STRESS WAVES AB The laser has found numerous applications in medicine, beginning with uses in ophthalmology in the 1960's. Today, lasers are used in tissue cutting, blood coagulation, photodynamic cancer therapy, arterial plaque removal, dental drilling, etc. In this paper, we examine those areas of laser medicine in which plasmas (ionized gases) are produced. In fact, the presence of a plasma is essential for the application at hand to succeed. We consider examples of the plasmas produced in ophthalmology (e.g., lens membrane destruction following cataract surgery), in urology and gastroenterology (e.g., kidney and gall stone ablation and fragmentation), and in cardiology and vascular surgery (e.g., laser ablation and removal of fibro-fatty and calcified arterial plaque). Experimental data are presented, along with some results from computer simulations of the phenomena. Comments on future directions in these areas are included. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. NR 64 TC 24 Z9 25 U1 2 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1991 VL 19 IS 6 BP 1209 EP 1219 DI 10.1109/27.125042 PG 11 WC Physics, Fluids & Plasmas SC Physics GA HD295 UT WOS:A1991HD29500018 ER PT J AU ERICKSON, RM FORMAN, PR AF ERICKSON, RM FORMAN, PR TI IMPROVING THE SIGNAL TO NOISE OF FIR POLARIMETRY ON CONSTRAINED-ACCESS PLASMA-EXPERIMENTS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB Experimental results are presented that demonstrate the pronounced effects produced on the polarization state of an FIR (far infrared) laser beam when a portion of the beam intersects a metallic tubulation at a glancing angle. The effects produced by this interaction are sufficient to totally obscure the desired measurement of Faraday rotation. A model is developed which qualitatively predicts the observations. A method of suppressing this effect, which is viable for the heterodyne method of measuring Faraday rotation, is presented. RP ERICKSON, RM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 5 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1991 VL 19 IS 6 BP 1248 EP 1253 DI 10.1109/27.125047 PG 6 WC Physics, Fluids & Plasmas SC Physics GA HD295 UT WOS:A1991HD29500023 ER PT J AU PHAM, H PHAM, M AF PHAM, H PHAM, M TI OPTIMAL DESIGNS OF (K,N-K+1)-OUT-OF-NORMAL-F-SYSTEMS - (SUBJECT TO 2 FAILURE MODES) SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE K-OUT-OF-NORMAL-SYSTEM; MEAN SYSTEM-PROFIT; MULTIPLE FAILURE MODES; RELIABILITY-COST OPTIMIZATION; OPTIMAL DESIGN ID OUT-OF-N; SYSTEMS AB We treat the problem of achieving optimal system size (n) for {k,n - k + 1}-out-of-n systems, assuming that failure may take either of two forms. We assume that components are i.i.d. and that the two kinds of system failures can have different costs. We determine the optimal k or n that maximize mean system-profit. We study the effect of system parameters on the optimal k or n, and show that there does not exist a pair (k,n) maximizing the mean system-profit. RP PHAM, H (reprint author), EG&G IDAHO INC,NATL ENGN LAB,SYST SAFETY & RISK EVALUAT GRP,IDAHO FALLS,ID 83415, USA. NR 8 TC 15 Z9 15 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD DEC PY 1991 VL 40 IS 5 BP 559 EP 562 DI 10.1109/24.106777 PG 4 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA GX888 UT WOS:A1991GX88800014 ER PT J AU MINNICK, MF HEINZEN, RA RESCHKE, DK FRAZIER, ME MALLAVIA, LP AF MINNICK, MF HEINZEN, RA RESCHKE, DK FRAZIER, ME MALLAVIA, LP TI A PLASMID-ENCODED SURFACE PROTEIN FOUND IN CHRONIC-DISEASE ISOLATES OF COXIELLA-BURNETII SO INFECTION AND IMMUNITY LA English DT Note ID SHIGELLA-FLEXNERI; ESCHERICHIA-COLI; VIRULENCE; SEQUENCES; LIPOPOLYSACCHARIDE; DETERMINANTS; ENDOCARDITIS; TRANSPORT; CLEAVAGE; CLONING AB The cbbE' gene codes for the E' protein of Coxiella burnetii and was detected in genomic DNA from all known human isolates of the biotzere strain but not in DNA from the other five strains of C. burnetii. The biotzere strain is strictly associated with chronic disease in humans. Extrinsic iodination of biotzere strain cells radiolabeled a 55-kDa protein which comigrated on sodium dodecyl sulfate-polyacrylamide gel electrophoresis with the E' protein synthesized in vitro from recombinants containing the cbbE' gene. The I-125-labeled 55-kDa protein was immunoprecipitated with polyclonal anti-E' antiserum, confirming its identity as E'. Predicted secondary structure of the E' polypeptide shows six regions of beta-sheet structure and an alpha-helix near the C terminus with adequate lengths to span a membrane. The predicted hydropathy profile of E' is similar to profiles of known outer membrane proteins and corroborates the biochemical data, indicating that the protein is located in the outer membrane of C. burnetii. C1 WASHINGTON STATE UNIV, DEPT MICROBIOL, PULLMAN, WA 99164 USA. PACIFIC NW LAB, DEPT BIOL, RICHLAND, WA 99352 USA. FU NIAID NIH HHS [AI20190] NR 36 TC 17 Z9 17 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD DEC PY 1991 VL 59 IS 12 BP 4735 EP 4739 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA GR214 UT WOS:A1991GR21400071 PM 1937836 ER PT J AU YANG, SM JACOBSON, RA AF YANG, SM JACOBSON, RA TI SYNTHESIS, CRYSTAL-STRUCTURE AND MOLECULAR MODELING OF AQUO MAGNESIUM TETRA(METHOXYPHENYL)PORPHYRIN SO INORGANICA CHIMICA ACTA LA English DT Article ID PHOTOSYNTHETIC BACTERIA; CHLOROPHYLL; GREEN AB 5,10,15,20-Tetrakis(4-methoxyphenyl)porphyrin magnesium(II) monohydrate, (H2O)MgT(OME)PP, has been synthesized. An X-ray structure determination was carried out for (H2O)MgT(OME)PP.HCCl3. The crystals are monoclinic, space group I2, with cell parameters a = 15.966(5), b = 9.192(1), c = 14.882(4) angstrom and beta = 100.38(2)-degrees. The structure was solved by direct method and refined to R = 0.068 and R(w) = 0.070 for 1297 observed reflections measured by diffractometer. The unit cell contains two molecules requiring that the molecule possess two-fold crystallographic symmetry. Intermolecular hydrogen bonding results in the formation of two-dimensional infinite polymers; such an occurrence in this structure provides the further support for a model of chlorophyll aggregation in photosynthetic organisms. In addition, molecular mechanics calculations on this compound gave a result in good agreement with the crystal structure determination and showed that the hydrated complex has a lower energy than its non-hydrated counterpart. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 16 TC 19 Z9 19 U1 1 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD DEC 1 PY 1991 VL 190 IS 1 BP 129 EP 134 DI 10.1016/S0020-1693(00)80241-8 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HC654 UT WOS:A1991HC65400019 ER PT J AU WIENKE, BR AF WIENKE, BR TI BUBBLE NUMBER SATURATION CURVE AND ASYMPTOTICS OF HYPOBARIC AND HYPERBARIC EXPOSURES SO INTERNATIONAL JOURNAL OF BIO-MEDICAL COMPUTING LA English DT Article DE BUBBLE MODELS; ASYMPTOTICS; SATURATION CURVES; DECOMPRESSION THEORY ID GAS CAVITATION NUCLEI; MODEL; GELATIN AB Within bubble number limits of the varying permeability and reduced gradient bubble models, it is shown that a linear form of the saturation curve for hyperbaric exposures and a nearly constant decompression ratio for hypobaric exposures are simultaneously recovered from the phase volume constraint. Both limits are maintained within a single bubble number saturation curve. A bubble term, varying exponentially with inverse pressure, provides closure. Two constants describe the saturation curve, both linked to seed numbers. Limits of other decompression models are also discussed and contrasted for completeness. It is suggested that the bubble number saturation curve thus provides a consistent link between hypobaric and hyperbaric data, a link not established by earlier decompression models. RP WIENKE, BR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,MS-F664,LOS ALAMOS,NM 87545, USA. NR 23 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0020-7101 J9 INT J BIOMED COMPUT JI Int. J. Bio-Med. Comput. PD DEC PY 1991 VL 29 IS 3-4 BP 215 EP 225 DI 10.1016/0020-7101(91)90039-H PG 11 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Biomedical; Medical Informatics SC Computer Science; Engineering; Medical Informatics GA GX873 UT WOS:A1991GX87300005 PM 1778637 ER PT J AU COLTRIN, ME KEE, RJ RUPLEY, FM AF COLTRIN, ME KEE, RJ RUPLEY, FM TI SURFACE CHEMKIN - A GENERAL FORMALISM AND SOFTWARE FOR ANALYZING HETEROGENEOUS CHEMICAL-KINETICS AT A GAS-SURFACE INTERFACE SO INTERNATIONAL JOURNAL OF CHEMICAL KINETICS LA English DT Article ID VAPOR-DEPOSITION REACTOR; RATE-LIMITING FACTORS; MATHEMATICAL-MODEL; FLUID-MECHANICS; DIAMOND; HYDROGEN; MIXTURE; GROWTH; MOVPE; GAAS AB This article describes a general kinetic formalism for treating the details of heterogeneous reactions at a gas-solid interface. We develop a nomenclature for treating reactions between the gas phase and surface species residing on any number of surface site types and bulk-phase species residing in bulk-phase mixtures or in pure bulk phases. The rate of progress of surface reactions follows the law of mass-action. We discuss the relationship between macroscopic conservation laws for mass and energy and the microscopic surface reaction rates as they might appear in boundary conditions for a chemically reacting f low. The formalism developed has been implemented in a general package of Fortran computer codes for the evaluation of complex surface-reaction kinetics called Surface Chemkin. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP COLTRIN, ME (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Schaff, William/B-5839-2009 NR 34 TC 97 Z9 98 U1 1 U2 19 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0538-8066 J9 INT J CHEM KINET JI Int. J. Chem. Kinet. PD DEC PY 1991 VL 23 IS 12 BP 1111 EP 1128 DI 10.1002/kin.550231205 PG 18 WC Chemistry, Physical SC Chemistry GA GQ180 UT WOS:A1991GQ18000004 ER PT J AU HE, Y LIU, XP LIN, MC MELIUS, CF AF HE, Y LIU, XP LIN, MC MELIUS, CF TI THE THERMAL-REACTION OF HNCO AT MODERATE TEMPERATURES SO INTERNATIONAL JOURNAL OF CHEMICAL KINETICS LA English DT Article ID KINETICS; CO AB The thermal reaction of HNCO has been studied in a static cell at temperatures between 873 and 1220 K and a constant pressure of 800 torr under highly diluted conditions, The reaction was measurable above 1000 K by FTIR spectrometry. The products detected include CO, CO2, HCN, NH3, and the unreacted HNCO. In this moderate temperature regime, the rates of product formation and HNCO decay cannot be accounted for by a previously established high-temperature mechanism, assuming HNCO --> NH + CO (1) as the initiation process. Instead, a new bimolecular reaction, 2HNCO --> CO2 + HNCNH (2), has been invoked to interpret the disappearance of HNCO as well as the formation of various products, most importantly CO2. The concentration profiles of all measured species can be quantitatively modeled, throughout the temperature range analyzed, by varying k2 Using a modified mechanism. The kinetically modeled values of k2 can be effectively represented by k2 = 10(10.84 +/- 0.70) exp(-21,240 +/- 1,960/T) cm3/mol s. This result agrees closely with that computed with the conventional transition-state theory using the TST parameters predicted by the BAC-MP4 method: k2(BAC-MP4) = 10(11.13) exp(-21,600/T) cm3/mol s. The bimolecular reaction takes place via a stable 4-membered ring intermediate which is isoelectronic with diketene; viz.(~)[GRAPHICS] C1 EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322. SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. NR 18 TC 18 Z9 20 U1 2 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0538-8066 J9 INT J CHEM KINET JI Int. J. Chem. Kinet. PD DEC PY 1991 VL 23 IS 12 BP 1129 EP 1149 DI 10.1002/kin.550231206 PG 21 WC Chemistry, Physical SC Chemistry GA GQ180 UT WOS:A1991GQ18000005 ER PT J AU Aoki, S Shrock, R Berg, B Bernard, C Ogilvie, M Petcher, D Bhanot, G Rossi, P Bitar, K Edwards, R Heller, UM Kennedy, A Sanielevici, S Brower, R Potvin, J Rebbi, C Brown, FR Christ, N Mawhinney, R Detar, C Draper, T Liu, KF Gottlieb, S Hamber, H Kilcup, G Shigemitsu, J Kogut, J Kronfeld, A Lee, IH Negele, J Ohta, S Sexton, JC Shuryak, E Sinclair, DK Soni, A Wilcox, W AF Aoki, Sinya Shrock, Robert Berg, Bernd Bernard, Claude Ogilvie, Michael Petcher, Don Bhanot, Gyan Rossi, Pietro Bitar, Khalil Edwards, Robert Heller, Urs M. Kennedy, Anthony Sanielevici, Sergio Brower, Richard Potvin, Jean Rebbi, Claudio Brown, Frank R. Christ, Norman Mawhinney, Robert Detar, Carleton Draper, Terrence Liu, Keh-Fei Gottlieb, Steve Hamber, Herbert Kilcup, Greg Shigemitsu, Junko Kogut, John Kronfeld, Andreas Lee, I-Hsiu Negele, John Ohta, Shigemi Sexton, James C. Shuryak, Edward Sinclair, D. K. Soni, Amarjit Wilcox, Walter TI PHYSICS GOALS OF THE QCD TERAFLOP PROJECT SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C LA English DT Article ID LATTICE GAUGE-THEORY; DECONFINING PHASE-TRANSITION; SPIN-DEPENDENT POTENTIALS; SCALAR-FERMION MODEL; MONTE-CARLO SIMULATIONS; HIGGS-BOSON MASS; TEMPERATURE QUANTUM CHROMODYNAMICS; ACCELERATED STOCHASTIC ALGORITHMS; SU(3) TOPOLOGICAL SUSCEPTIBILITY; RELATIVE CHARGE-DISTRIBUTIONS C1 [Aoki, Sinya; Shrock, Robert] SUNY Stony Brook, Inst Theoret Phys, Stony Brook, NY 11794 USA. [Berg, Bernd] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. [Berg, Bernd; Bitar, Khalil; Edwards, Robert; Heller, Urs M.; Kennedy, Anthony; Sanielevici, Sergio] Florida State Univ, Supercomp Computat Res Inst, Tallahassee, FL 32306 USA. [Bernard, Claude; Ogilvie, Michael; Petcher, Don] Washington Univ, Dept Phys, St Louis, MO 63130 USA. [Bhanot, Gyan; Rossi, Pietro] Thinking Machines Corp, Cambridge, MA 02139 USA. [Brower, Richard; Potvin, Jean; Rebbi, Claudio] Boston Univ, Dept Phys, Boston, MA 02215 USA. [Brown, Frank R.; Christ, Norman; Mawhinney, Robert] Columbia Univ, Dept Phys, New York, NY 10027 USA. [Detar, Carleton] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA. [Draper, Terrence; Liu, Keh-Fei] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA. [Gottlieb, Steve] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA. [Hamber, Herbert] Univ Calif Irvine, Dept Phys, Irvine, CA 92717 USA. [Kilcup, Greg; Shigemitsu, Junko] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. [Kogut, John] Univ Illinois, Dept Phys, Urbana, IL 61801 USA. [Kronfeld, Andreas] Fermi Natl Accelerator Lab, Theoret Phys Grp, Batavia, IL 60510 USA. [Lee, I-Hsiu] Rockefeller Univ, Dept Phys, New York, NY 10021 USA. [Negele, John] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA. [Ohta, Shigemi] Riken Phys & Chem Res Inst, Wako, Saitama 35101, Japan. [Sexton, James C.] Trinity Coll, Sch Math, Dublin 2, Ireland. [Shuryak, Edward] SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA. [Sinclair, D. K.] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. [Soni, Amarjit] Brookhaven Natl Lab, Upton, NY 11973 USA. [Wilcox, Walter] Baylor Univ, Dept Phys, Waco, TX 76798 USA. RP Aoki, S (reprint author), SUNY Stony Brook, Inst Theoret Phys, Stony Brook, NY 11794 USA. OI Kronfeld, Andreas/0000-0003-2716-1149 NR 464 TC 17 Z9 17 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0129-1831 EI 1793-6586 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C PD DEC PY 1991 VL 2 IS 4 BP 829 EP 947 DI 10.1142/S0129183191001049 PG 119 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA V33NL UT WOS:000209025400001 ER PT J AU SUSSWEIN, SY HENDERSON, TC ZACHARY, JL HANSEN, C HINKER, P MARSDEN, GC AF SUSSWEIN, SY HENDERSON, TC ZACHARY, JL HANSEN, C HINKER, P MARSDEN, GC TI PARALLEL PATH CONSISTENCY SO INTERNATIONAL JOURNAL OF PARALLEL PROGRAMMING LA English DT Article DE PATH CONSISTENCY; PARALLEL IMPLEMENTATION ID CONSTRAINT SATISFACTION PROBLEMS; COMPLEXITY; RELAXATION; NETWORKS AB Filtering algorithms are well accepted as a means of speeding up the solution of the consistent labeling problem (CLP). Despite the fact that path consistency does a better job of filtering than arc consistency, AC is still the preferred technique because it has a much lower time complexity. We are implementing parallel path consistency algorithms on multiprocessors and comparing their performance to the best sequential and parallel arc consistency algorithms.(1,2) (See also work by Keretho et al.(3) and Kasif(4). Preliminary work has shown linear performance increases for parallelized path consistency and also shown that in many cases performance is significantly better than the theoretical worst case. These two results lead us to believe that parallel path consistency may be a superior filtering technique. Finally, we have implemented path consistency as an outer product computation and have obtained good results (e.g., linear speedup on a 64K-node Connection Machine 2). C1 UNIV UTAH,DEPT COMP SCI,SALT LAKE CITY,UT 84112. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. NR 25 TC 3 Z9 3 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0885-7458 J9 INT J PARALLEL PROG JI Int. J. Parallel Program. PD DEC PY 1991 VL 20 IS 6 BP 453 EP 473 DI 10.1007/BF01547895 PG 21 WC Computer Science, Theory & Methods SC Computer Science GA JX473 UT WOS:A1991JX47300002 ER PT J AU ALMLOF, J SHEPARD, R HARRISON, R AF ALMLOF, J SHEPARD, R HARRISON, R TI ARGONNE INTEGRAL EVALUATION WORKSHOP - INTRODUCTION SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Editorial Material C1 UNIV MINNESOTA,MINNESOTA SUPERCOMP INST,MINNEAPOLIS,MN 55155. ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439. RP ALMLOF, J (reprint author), UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55155, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 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 DEC PY 1991 VL 40 IS 6 BP 721 EP 722 DI 10.1002/qua.560400602 PG 2 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA GP192 UT WOS:A1991GP19200001 ER PT J AU PITZER, RM WINTER, NW AF PITZER, RM WINTER, NW TI SPIN-ORBIT (CORE) AND CORE POTENTIAL INTEGRALS SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODOLOGY OF THE EVALUATION OF INTEGRALS IN LCAO CALCULATIONS CY AUG 23-25, 1990 CL ARGONNE NATL LAB, ARGONNE, IL SP ARGONNE NATL LAB HO ARGONNE NATL LAB ID RELATIVISTIC EFFECTIVE POTENTIALS; MOLECULAR CALCULATIONS; ELECTRONIC-STRUCTURE; ABINITIO; OPERATORS; PSEUDOPOTENTIALS AB Molecular integral formulas and corresponding computational algorithms are developed for the relativistic spin-orbit and core potential operators that are obtained from atomic relativistic calculations by means of the effective core potential procedure. Much use is made of earlier work on core potential integrals by McMurchie and Davidson. The resulting computer code has been made part of the ARGOS (Argonne, Ohio State) program from the COLUMBUS suite of programs, which computes the needed integrals over symmetry-adapted combinations of generally contacted Gaussian atomic orbitals. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PITZER, RM (reprint author), OHIO STATE UNIV,DEPT CHEM,120 W 18TH AVE,COLUMBUS,OH 43210, USA. NR 24 TC 57 Z9 57 U1 0 U2 1 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 DEC PY 1991 VL 40 IS 6 BP 773 EP 780 DI 10.1002/qua.560400606 PG 8 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA GP192 UT WOS:A1991GP19200005 ER PT J AU CURTISS, LA BINNING, RC AF CURTISS, LA BINNING, RC TI A CONTRACTED BROMINE BASIS SET FOR USE IN CALCULATION OF MOLECULAR-ENERGIES SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODOLOGY OF THE EVALUATION OF INTEGRALS IN LCAO CALCULATIONS CY AUG 23-25, 1990 CL ARGONNE NATL LAB, ARGONNE, IL SP ARGONNE NATL LAB HO ARGONNE NATL LAB ID GAUSSIAN BASIS FUNCTIONS; MAIN-GROUP ELEMENTS; ATOMIC BASIS SETS; FIRST-ROW ATOMS; ORGANOMETALLIC COMPOUNDS; ORBITAL METHODS; 3RD-ROW; POLARIZATION; GEHN; ASHN AB A contracted [9s6p2d] basis set derived from Dunning's (14s11p5d) primitive Gaussian set for bromine has been used in ab initio molecular orbital calculations of the dissociation energies of HBr, CH3Br, and Br2, the ionization potentials of Br and HBr, and the electron affinity of Br. The calculated energies are within 0.1 eV of the experimental values. This is similar to the accuracy obtained in a previous study, also using a contracted [9s6p2d] basis set, of the dissociation and ionization energies of the GeH(n), AsH(n), and SeH(n) hydrides. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. IIT,DEPT CHEM,CHICAGO,IL 60616. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 32 TC 12 Z9 12 U1 1 U2 1 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 DEC PY 1991 VL 40 IS 6 BP 781 EP 787 DI 10.1002/qua.560400607 PG 7 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA GP192 UT WOS:A1991GP19200006 ER PT J AU HARRISON, RJ AF HARRISON, RJ TI PORTABLE TOOLS AND APPLICATIONS FOR PARALLEL COMPUTERS SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODOLOGY OF THE EVALUATION OF INTEGRALS IN LCAO CALCULATIONS CY AUG 23-25, 1990 CL ARGONNE NATL LAB, ARGONNE, IL SP ARGONNE NATL LAB HO ARGONNE NATL LAB ID CI METHOD; IMPLEMENTATION; TRANSFORMATION; ARCHITECTURES AB A distributed-memory model is adopted for the development of parallel ab initio codes with an emphasis on portability as well as efficiency. A highly portable message-passing toolkit (inspired by the Argonne ACRF PARMACS) is described. Examples and results of its use are presented. RP HARRISON, RJ (reprint author), ARGONNE NATL LAB, DIV CHEM, THEORET CHEM GRP, ARGONNE, IL 60439 USA. NR 37 TC 58 Z9 58 U1 0 U2 0 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 DEC PY 1991 VL 40 IS 6 BP 847 EP 863 DI 10.1002/qua.560400612 PG 17 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA GP192 UT WOS:A1991GP19200011 ER PT J AU SHEPARD, R AF SHEPARD, R TI THE COLUMBUS STANDARD INTEGRAL FILE STRUCTURE - A PROPOSED INTERCHANGE FORMAT SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODOLOGY OF THE EVALUATION OF INTEGRALS IN LCAO CALCULATIONS CY AUG 23-25, 1990 CL ARGONNE NATL LAB, ARGONNE, IL SP ARGONNE NATL LAB HO ARGONNE NATL LAB AB The integral file structure used in the COLUMBUS Program System is described. This file structure is proposed for use as an interchange format for the exchange of information between various electronic structure codes. Access to the integral and density matrix arrays stored in the file structure is simplified by a supporting subroutine library. This library is portable across various computers and is readily available to programmers from the COLUMBUS distribution files. This library provides for the efficient processing of individual records, including the use of asynchronous I/O and the vectorized processing of packed orbital labels. The individual arrays are identified in a self-defining and extensible manner, allowing for the addition of new integral types as demanded by the application. The format of the individual records is also self-defining, allowing for the use of various packing and data compression methods within each record without burdening the calling program with unnecessary complications. RP SHEPARD, R (reprint author), ARGONNE NATL LAB, DIV CHEM, THEORET CHEM GRP, ARGONNE, IL 60439 USA. NR 5 TC 4 Z9 4 U1 0 U2 0 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 DEC PY 1991 VL 40 IS 6 BP 865 EP 887 DI 10.1002/qua.560400613 PG 23 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA GP192 UT WOS:A1991GP19200012 ER PT J AU PEAK, MJ WANG, L HILL, CK PEAK, JG AF PEAK, MJ WANG, L HILL, CK PEAK, JG TI COMPARISON OF REPAIR OF DNA DOUBLE-STRAND BREAKS CAUSED BY NEUTRON OR GAMMA-RADIATION IN CULTURED HUMAN-CELLS SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID INDUCED SINGLE-STRAND; CHINESE-HAMSTER-CELLS; MAMMALIAN-CELLS; FILTER ELUTION; ALPHA-PARTICLES; X-RAYS; V79 CELLS; DAMAGE; IRRADIATION; FIBROBLASTS AB The dose-response for the induction of initial double-strand breaks (dsb) in DNA of human epithelioid cells by JANUS 0.85 MeV fission-spectrum neutrons was parabolic as assayed by a calibrated neutral filter elution technique. The relative biological effectiveness (RBE) of these neutrons relative to Co-60 gamma-rays was unity. The kinetics of repair after a 60 Gy gamma-ray exposure were biphasic. About 65% of these dsb were rapidly repaired (T1/2 of approximately 2 min), and the remainder were almost completely removed after 150 min at a slower rate (T1/2 = 30 min). After the same dose of JANUS neutrons, the rapid repair component was markedly reduced (possibly not a significant repair component), and the bulk of the dsb were sealed more slowly (T1/2 = 90 min). After 150 min, 25% remained unsealed. Even after a lower neutron dose (20 Gy), a proportion of the dsb were refractory to repair. Thus, unrepaired (or irreparable) dsb induced by high energy neutrons might explain the high RBE of neutrons for cell killing. C1 UNIV SO CALIF,SCH MED,DEPT RADIAT BIOL,CANC RES LAB,LOS ANGELES,CA 90015. RP PEAK, MJ (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 35 TC 44 Z9 47 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD DEC PY 1991 VL 60 IS 6 BP 891 EP 898 DI 10.1080/09553009114552691 PG 8 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA GQ182 UT WOS:A1991GQ18200004 PM 1682401 ER PT J AU GOTTLIEB, SA KRASNITZ, A HELLER, UM KENNEDY, AD LIU, W KOGUT, JB RENKEN, RL SINCLAIR, DK WANG, KC SUGAR, RL TOUSSAINT, D AF GOTTLIEB, SA KRASNITZ, A HELLER, UM KENNEDY, AD LIU, W KOGUT, JB RENKEN, RL SINCLAIR, DK WANG, KC SUGAR, RL TOUSSAINT, D TI HADRON THERMODYNAMICS ON THE CONNECTION MACHINE SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article ID PHASE-TRANSITION; QUANTUM CHROMODYNAMICS; QUARK PLASMA; QCD; SPECTRUM; TEMPERATURE AB Quantum chromodynamics (QCD) predicts that at very high temperature there is a phase transition or cross-over from the low-temperature state of ordinary matter to a high-temperature state consisting of a plasma of quarks and gluons. The nature of this transition and the properties of the high-temperature phase are important for an understanding of cosmology, heavy ion collisions, and the structure of QCD itself. The study of high-temperature QCD is one of the major goals of lattice gauge theory. Such studies involve large-scale computer simulations. We briefly review the status of this subject and present preliminary results from a large-scale study in progress on the Pittsburgh Super-computer Center's Connection Machine (CM-2). C1 UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. INDIANA UNIV,BLOOMINGTON,IN 47401. FLORIDA STATE UNIV,SCRI,TALLAHASSEE,FL 32306. THINKING MACHINES CORP,CAMBRIDGE,MA. UNIV ILLINOIS,URBANA,IL 61801. ARGONNE NATL LAB,DIV HEP,COMP PHYS GRP,ARGONNE,IL 60439. UNIV ARIZONA,TUCSON,AZ 85721. NR 23 TC 2 Z9 2 U1 1 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD WIN PY 1991 VL 5 IS 4 BP 50 EP 60 DI 10.1177/109434209100500405 PG 11 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA HA054 UT WOS:A1991HA05400005 ER PT J AU WITTEN, A AF WITTEN, A TI THE APPLICATION OF A MAXIMUM-LIKELIHOOD ESTIMATOR TO TUNNEL DETECTION SO INVERSE PROBLEMS LA English DT Letter AB The concept of the maximum likelihood estimator is integrated with the imaging formalism of diffraction tomography. The result is a signal processing algorithm which yields an image of the log likelihood function for the existence and position of a predetermined target. The approach is applied to cross-borehole radar data in order to detect and locate a tunnel. RP WITTEN, A (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 12 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0266-5611 J9 INVERSE PROBL JI Inverse Probl. PD DEC PY 1991 VL 7 IS 6 BP L49 EP L55 DI 10.1088/0266-5611/7/6/003 PG 7 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA GW921 UT WOS:A1991GW92100003 ER PT J AU SCHRIESHEIM, A AF SCHRIESHEIM, A TI TOWARD A GOLDEN-AGE FOR TECHNOLOGY-TRANSFER SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Article RP SCHRIESHEIM, A (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD WIN PY 1991 VL 7 IS 2 BP 52 EP 58 PG 7 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA ER714 UT WOS:A1991ER71400050 ER PT J AU CHASE, LL DAVIS, LE KRUPKE, WF PAYNE, SA AF CHASE, LL DAVIS, LE KRUPKE, WF PAYNE, SA TI MATERIALS FOR DIODE PUMPED SOLID-STATE LASERS SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON LASER M2P CY JUL 09-11, 1991 CL GRENOBLE, FRANCE SP UNIV JOSEPH FOURIER, CNRS, DEF RES ESTAB TORONTO, CEA, LETI, MAIRIE GRENOBLE, COHERENT SCI, HAMAMATSU, JOBIN YVON, MELLES GRIOT, OPTILAS AB The advantages of semiconductor diode lasers and laser arrays as pump sources for solid state lasers are reviewed. The properties desired for solid state laser media for various diode pumping applications are discussed, and the characteristics of several promising media are summarized. RP CHASE, LL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,L-490,LIVERMORE,CA 94550, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD DEC PY 1991 VL 1 IS C7 BP 17 EP 22 DI 10.1051/jp4:1991704 PG 6 WC Physics, Multidisciplinary SC Physics GA JJ314 UT WOS:A1991JJ31400005 ER PT J AU WINGE, RK CRAIN, JS HOUK, RS AF WINGE, RK CRAIN, JS HOUK, RS TI HIGH-SPEED PHOTOGRAPHIC STUDY OF PLASMA FLUCTUATIONS AND INTACT AEROSOL-PARTICLES OR DROPLETS IN INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY SO JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY LA English DT Article DE HIGH-SPEED PHOTOGRAPHY; PLASMA FLUCTUATION; AEROSOL PARTICLES AND DROPLETS; INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY ID ATOMIC EMISSION-SPECTROMETRY; NOISE-POWER SPECTRA; LAMINAR-FLOW TORCH; DYNAMICS AB Cine-films of the inductively coupled plasma were taken at 3000 frames s-1 while the plasma was sampled for mass spectometry. The axial channel expanded and contracted Periodically at frequencies of 260-300 Hz, depending on the operating conditions. The frequency of the observed fluctuations decreased as the separation between the torch and sampling cone increased. With a concentric nebulizer, emission from vapour clouds surrounding the aerosol droplets or particles was observed flowing along the axial channel and into the sampling orifice. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES LAB,AMES,IA 50011. RP HOUK, RS (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES LAB,AMES,IA 50011, USA. NR 24 TC 47 Z9 47 U1 1 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0267-9477 J9 J ANAL ATOM SPECTROM JI J. Anal. At. Spectrom. PD DEC PY 1991 VL 6 IS 8 BP 601 EP & DI 10.1039/ja9910600601 PG 0 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA GT653 UT WOS:A1991GT65300003 ER PT J AU WANG, YY PARKS, DM LLOYD, WR REUTER, WG EPSTEIN, J AF WANG, YY PARKS, DM LLOYD, WR REUTER, WG EPSTEIN, J TI ELASTIC-PLASTIC DEFORMATION IN SURFACE-CRACKED PLATES - EXPERIMENT AND NUMERICAL-ANALYSIS SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME LA English DT Article ID J-DOMINANCE; TIP FIELDS; BEHAVIOR AB Detailed three-dimensional nonlinear finite element (FE) analyses and experimental moire studies are performed on a plate containing a moderately deep part-through surface crack to establish limits of HRR-dominance. The plate is subjected to predominantly far-field tensile loading. The material under investigation is ASTM A710 steel, which was constitutively modeled by large deformation J2 flow theory of plasticity. The FE mesh was carefully constructed to resolve both crack front fields (such as J-integral and CTOD) and global fields (such as surface displacements, strains). By comparing the J-integral and CTOD results with an earlier HRR-dominance study using (small strain) deformation theory of plasticity, we found little effect of the different formulations on the crack front fields. The global deformation fields from the numerical simulation are in good agreement with our experimental results. The eventual loss of HRR-dominance is intimately related to the interaction of the global plastic flow fields with those of the crack front. C1 MIT,DEPT MECH ENGN,CAMBRIDGE,MA 02139. IDAHO NATL ENGN LAB,FRACTURE & DYNAM BEHAV GRP,IDAHO FALLS,ID 83415. NR 35 TC 3 Z9 3 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0021-8936 J9 J APPL MECH-T ASME JI J. Appl. Mech.-Trans. ASME PD DEC PY 1991 VL 58 IS 4 BP 895 EP 903 DI 10.1115/1.2897703 PG 9 WC Mechanics SC Mechanics GA HP719 UT WOS:A1991HP71900005 ER PT J AU WURZ, P LYKKE, KR PELLIN, MJ GRUEN, DM AF WURZ, P LYKKE, KR PELLIN, MJ GRUEN, DM TI VELOCITY DISTRIBUTIONS AND PHOTODISSOCIATION OF NEUTRAL C60 AND C70 CLUSTERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LARGE CARBON CLUSTERS; METAL-CLUSTERS; C-60; BUCKMINSTERFULLERENE; IONS; POLYMERS; SYSTEMS; SPECTRA; PHASE AB Purified samples of C60 and C70 are synthesized according to recently published procedures. Desorption with 308 nm laser light from solid C60 and C70 samples is used as a neutral cluster source to study the ionization and concurrent fragmentation in the gas phase by interaction with intense laser radiation. According to a well-known classification scheme, the ionization/fragmentation behavior of C60 and C70 clusters is clearly identified as of class A type. Also, the laser desorption process itself has been investigated by measuring the velocity distributions of laser desorbed neutral C60 and C70 clusters. Good agreement of the experimental data with a Maxwell-Boltzmann distribution is found. We conclude that at the applied laser fluences, C60 and C70 clusters are desorbed by evaporation induced by the incident radiation, providing no fragmentation in the desorption process. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP WURZ, P (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 30 TC 39 Z9 39 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 DEC 1 PY 1991 VL 70 IS 11 BP 6647 EP 6652 DI 10.1063/1.349836 PG 6 WC Physics, Applied SC Physics GA GU049 UT WOS:A1991GU04900002 ER PT J AU KADISH, A MAIER, WB AF KADISH, A MAIER, WB TI ELECTROMAGNETIC-RADIATION FROM ABRUPT CURRENT CHANGES IN ELECTRICAL DISCHARGES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LUMPED-CIRCUIT MODEL; DIELECTRIC SURFACES AB We treat electromagnetic radiation from narrow electrical discharges, with particular emphasis on the asymptotic behavior at high frequencies f. We show that discontinuities in the discharge current and its derivatives dominate the high-frequency part of the radiated spectrum. Specifically, when a current discontinuity is present, the envelope of the radiated fields falls off with large f as f -1 for almost all observation angles. If the current is continuous but has discontinuities in its first derivatives, then the envelope of the radiated field falls off as f -(1 + 1/n) at large f for a range of observation angles. If the discharge current and its first derivatives are continuous, then the radiated fields fall off at least as fast as f -2 at large f. The characteristic high-frequency dependence associated with abrupt current change persists for some large range of f, even when current variation is not precisely abrupt. We illustrate the general results with radiation from AWA discharge models (previously referred to as arc welder's ansatz models) featuring a constant electric field associated with dissipative discharge processes. RP KADISH, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 9 Z9 9 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 DEC 1 PY 1991 VL 70 IS 11 BP 6700 EP 6711 DI 10.1063/1.349844 PG 12 WC Physics, Applied SC Physics GA GU049 UT WOS:A1991GU04900010 ER PT J AU TOGANO, K KUMAKURA, H KASE, J LI, Q OSTENSON, JE FINNEMORE, DK AF TOGANO, K KUMAKURA, H KASE, J LI, Q OSTENSON, JE FINNEMORE, DK TI STRAIN TOLERANCE OF DOCTOR-BLADE-PROCESSED BI2SR2CA1CU2O8-DELTA TAPES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DEPENDENCE; FIELD AB The strain tolerance of doctor blade tapes of the high-temperature superconductor Bi2Sr2Ca1Cu2O8-delta have been studied to determine the suitability of these materials for magnet conductors. Critical currents that are on the order of 150 000 A/cm2 in zero magnetic field fall by about 30% with 0.1% bending strain and by a factor of 6 with 0.2% bending strain. At 20 T, critical currents fall with strain by approximately the same factor as at 4.2 K, but the critical currents fall with field somewhat faster. These bending strain results have a character quite different from Nb3Sn bronze process material in that there is essentially no prestress from the Cu jacket and there seems to be only a very small reversible range where the sample is within the elastic limit. C1 ASAHI GLASS CO LTD,HAZAWA,YOKOHAMA 221,JAPAN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP TOGANO, K (reprint author), NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN. NR 9 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1991 VL 70 IS 11 BP 6966 EP 6969 DI 10.1063/1.349824 PG 4 WC Physics, Applied SC Physics GA GU049 UT WOS:A1991GU04900046 ER PT J AU DYE, RC FOLTYN, SR WU, XD PETERSON, EJ MUENCHAUSEN, RE NOGAR, NS AF DYE, RC FOLTYN, SR WU, XD PETERSON, EJ MUENCHAUSEN, RE NOGAR, NS TI PROPERTIES OF YBA2CU3O7-DELTA FILMS UPON LOW FLUENCE LASER IRRADIATION SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTORS; BA-CU-O; THIN-FILMS; DEPOSITION AB The electrical responses and crystallinity of YBa2Cu3O7-delta films were measured as a function of excimer laser exposure (308 nm) and laser fluences ranging from 20 to 150 mJ/cm2. T(c) and J(c) were measured with an inductive technique and with standard dc transport measurements. The crystallinity of the films, as determined by Rutherford backscattering spectrometry, scanning electron microscopy, and x-ray diffraction, was altered by the formation of a degraded surface layer, even at fluences well below the melting threshold. The critical current of a film can be modified with a high degree of accuracy and can be correlated with a boundary layer in the film. This allows for the critical current to be decreased over three orders of magnitude with a resolution of 255 A/cm2 per laser shot. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. RP DYE, RC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 21 TC 1 Z9 1 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1991 VL 70 IS 11 BP 7161 EP 7163 DI 10.1063/1.349778 PG 3 WC Physics, Applied SC Physics GA GU049 UT WOS:A1991GU04900079 ER PT J AU CARLSON, BC AF CARLSON, BC TI B-SPLINES, HYPERGEOMETRIC-FUNCTIONS, AND DIRICHLET AVERAGES SO JOURNAL OF APPROXIMATION THEORY LA English DT Article ID MULTIVARIATE C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. RP CARLSON, BC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 17 TC 7 Z9 7 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9045 J9 J APPROX THEORY JI J. Approx. Theory PD DEC PY 1991 VL 67 IS 3 BP 311 EP 325 DI 10.1016/0021-9045(91)90006-V PG 15 WC Mathematics SC Mathematics GA GR614 UT WOS:A1991GR61400006 ER PT J AU CONTRERAS, A DRUMMOND, M BALI, A BLANCO, G GARCIA, E BUSH, G KENNEDY, C MERRICK, M AF CONTRERAS, A DRUMMOND, M BALI, A BLANCO, G GARCIA, E BUSH, G KENNEDY, C MERRICK, M TI THE PRODUCT OF THE NITROGEN-FIXATION REGULATORY GENE NFRX OF AZOTOBACTER-VINELANDII IS FUNCTIONALLY AND STRUCTURALLY HOMOLOGOUS TO THE URIDYLYLTRANSFERASE ENCODED BY GLND IN ENTERIC BACTERIA SO JOURNAL OF BACTERIOLOGY LA English DT Article ID MUTANTS LACKING URIDYLYLTRANSFERASE; GLUTAMINE-SYNTHETASE; KLEBSIELLA-PNEUMONIAE; ESCHERICHIA-COLI; CLONING VECTORS; GLNALG OPERON; HOST-RANGE; SEQUENCE; PURIFICATION; AEROGENES AB We sequenced the nitrogen fixation regulatory gene nfrX from Azotobacter vinelandii, mutations in which cause a Nif- phenotype, and found that it encodes a 105-kDa protein (NfrX), the N terminus of which is highly homologous to that of the uridvlyltransferase-uridylyl-removing enzyme encoded by glnD in Escherichia coli. In vivo complementation experiments demonstrate that the glnD and nfrX products are functionally interchangeable. A. vinelandii nfrX thus appears to encode a uridylyltransferase-uridylyl-removing enzyme, and in this paper we report the first sequence of such a protein. The Nif- phenotype of nfrX mutants can be suppressed by a second mutation in a recently identified nifL-like gene immediately upstream of nifA in A. vinelandii. NifL mediates nif regulation in response to the N status in A. vinelandii, presumably by inhibiting NifA activator function as occurs in Klebsiella pneumoniae; thus, one role of NfrX is to modify, either directly or indirectly, the activity of the nifL product. C1 UNIV SUSSEX,AFRC,NITROGEN FIXAT LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MERRICK, M (reprint author), UNIV SUSSEX,AFRC,NITROGEN FIXAT LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. RI Contreras, Asuncion/K-2159-2012; Blanco, Gonzalo/D-8735-2014 OI Blanco, Gonzalo/0000-0003-3827-3111 NR 52 TC 39 Z9 40 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD DEC PY 1991 VL 173 IS 24 BP 7741 EP 7749 PG 9 WC Microbiology SC Microbiology GA GV187 UT WOS:A1991GV18700001 PM 1683868 ER PT J AU LU, S MAESTRE, MF AF LU, S MAESTRE, MF TI OBSERVATION OF DNA-MOLECULES UNDERGOING CAPILLARY ELECTROPHORESIS SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID GEL-ELECTROPHORESIS; ZONE ELECTROPHORESIS; SEPARATION AB This paper presents a method to observe the motions and configurations of large DNA molecules undergoing capillary electrophoresis (CE). A simple device to perform CE horizontally under microscopic observation is designed and images of single DNA molecules inside the capillary are obtained using an epi-fluorescence microscope. DNA molecules moved towards the negative electrode when an electric field was applied. The mobilities of three types of DNA (T4 and lambda-bacteriophage DNA and PBR322 plasmid DNA) were measured at different electric field strength. The mobility vs. electric field strength curves of these three large DNAs showed that the mobility remained constant at high electric field strength (200-600 Volt/cm) and increased significantly at low electric field strength (less-than-or-equal-to 50 Volt/cm.). The apparent mobilities of the large DNA molecules were independent of molecular weight. At electric field strengths greater-than-or-equal-to 400 Volt/cm., big aggregates (snowballs) of DNA molecules formed and moved upstream towards the positive electrode. When the field was turned off, the aggregates dissociated into a cloud of single DNA molecules, and diffused into the solution. RP LU, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,3307,70A,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 25 TC 0 Z9 0 U1 2 U2 3 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD DEC PY 1991 VL 9 IS 3 BP 525 EP 536 PG 12 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GX190 UT WOS:A1991GX19000010 ER PT J AU KATONA, T GUCZI, L SOMORJAI, GA AF KATONA, T GUCZI, L SOMORJAI, GA TI REDUCTION OF NITRIC-OXIDE BY AMMONIA AT ATMOSPHERIC PRESSURES OVER PLATINUM POLYCRYSTALLINE FOILS AS MODEL CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID NOBLE-METAL CATALYSTS; STEADY-STATE KINETICS; DEACTIVATED CATALYSTS; SUPPORTED PLATINUM; SURFACE REACTIONS; SO2 DEACTIVATION; PT(111) SURFACE; NO REDUCTION; NH3; OSCILLATIONS C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. JOZSEF ATTILA UNIV,DEPT ORGAN CHEM,H-6720 SZEGED,HUNGARY. HUNGARIAN ACAD SCI,INST ISOTOPES,H-1525 BUDAPEST,HUNGARY. RP KATONA, T (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT & CHEM SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 23 TC 14 Z9 14 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD DEC PY 1991 VL 132 IS 2 BP 440 EP 450 DI 10.1016/0021-9517(91)90161-V PG 11 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA GR259 UT WOS:A1991GR25900014 ER PT J AU YOKOMIZO, GH KRISHNA, KR BELL, AT AF YOKOMIZO, GH KRISHNA, KR BELL, AT TI EVALUATION OF THE INTRINSIC RATE PARAMETERS OF THE FISCHER-TROPSCH SYNTHESIS - COMMENT SO JOURNAL OF CATALYSIS LA English DT Letter C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP YOKOMIZO, GH (reprint author), UNIV CALIF BERKELEY,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 4 TC 1 Z9 1 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 0021-9517 J9 J CATAL JI J. Catal. PD DEC PY 1991 VL 132 IS 2 BP 571 EP 572 DI 10.1016/0021-9517(91)90174-3 PG 2 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA GR259 UT WOS:A1991GR25900027 ER PT J AU STREULI, CH BAILEY, N BISSELL, MJ AF STREULI, CH BAILEY, N BISSELL, MJ TI CONTROL OF MAMMARY EPITHELIAL DIFFERENTIATION - BASEMENT-MEMBRANE INDUCES TISSUE-SPECIFIC GENE-EXPRESSION IN THE ABSENCE OF CELL CELL-INTERACTION AND MORPHOLOGICAL POLARITY SO JOURNAL OF CELL BIOLOGY LA English DT Article ID ADHESION MOLECULE UVOMORULIN; EXTRACELLULAR-MATRIX; TERMINAL DIFFERENTIATION; E-CADHERIN; SUBSTRATUM ADHESION; MONOCLONAL-ANTIBODY; GROWTH-FACTOR; LINE PC12; INTEGRIN; LAMININ AB Functional differentiation in mammary epithelia requires specific hormones and local environmental signals. The latter are provided both by extracellular matrix and by communication with adjacent cells, their action being intricately connected in what appears to be a cascade of events leading to milk production. To distinguish between the influence of basement membrane and that of cell-cell contact in this process, we developed a novel suspension culture assay in which mammary epithelial cells were embedded inside physiological substrata. Single cells, separated from each other, were able to assimilate information from a laminin-rich basement membrane substratum and were induced to express beta-casein. In contrast, a stromal environment of collagen I was not sufficient to induce milk synthesis unless accompanied by cell-cell contact. The expression of milk proteins did not depend on morphological polarity since E-cadherin and alpha-6 integrin were distributed evenly around the surface of single cells. In medium containing 5-mu-M Ca2+, cell-cell interactions were impaired in small clusters and E-cadherin was not detected at the cell surface, yet many cells were still able to produce beta-casein. Within the basement membrane substratum, signal transfer appeared to be mediated through integrins since a function-blocking anti-integrin antibody severely diminished the ability of suspension-cultured cells to synthesize beta-casein. These results provide evidence for a central role of basement membrane in the induction of tissue-specific gene expression. RP STREULI, CH (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. NR 63 TC 494 Z9 499 U1 2 U2 15 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9525 J9 J CELL BIOL JI J. Cell Biol. PD DEC PY 1991 VL 115 IS 5 BP 1383 EP 1395 DI 10.1083/jcb.115.5.1383 PG 13 WC Cell Biology SC Cell Biology GA GT488 UT WOS:A1991GT48800018 PM 1955479 ER PT J AU RUSCIC, B APPELMAN, EH BERKOWITZ, J AF RUSCIC, B APPELMAN, EH BERKOWITZ, J TI PHOTOIONIZATION MASS-SPECTROMETRIC STUDY OF CH3OF SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PYROLYSIS AB The vacuum ultraviolet photoionization mass spectrum of CH3OF displays a prominent parent ion peak, whose adiabatic onset is 11.340 +/- 0.008 eV, although much lower energy fragmentation processes (CH2O+ + HF, 8.0 eV; CH2OH+ + F, 9.3 eV) are possible. These lower energy processes have very low intensity. Two higher energy processes, to CH3+ + OF and CH2O+ +H +F, are observed. Their thresholds are used to determine DELTA-H(f0)0 (CH3OF) greater-than-or-equal-to - 23.0 +/- 0.7 kcal/mol, or D0 (CH3O-F) less-than-or-equal-to 47.4 +/- 1.2 kcal/mol. CH2OF+ is a significant fragment, whose appearance energy leads to DELTA-H(f0)0 (CH2OF+) almost-equal-to 215.1 +/- 0.8 kcal/mol. RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 15 TC 22 Z9 22 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 7957 EP 7961 DI 10.1063/1.461325 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500017 ER PT J AU CURTISS, LA POPLE, JA AF CURTISS, LA POPLE, JA TI THEORETICAL-STUDY OF METHYL HYPOFLUORITE (CH3OF) AND RELATED-COMPOUNDS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HOF AB The Gaussian-2 (G2) theoretical procedure, based on ab initio molecular orbital theory, is used to calculate the energies of CH3 OF, CH3 OF+, and related compounds. In this study we have found methyl hypofluorite to have a trans C(s) structure and to be stable with respect to loss of fluorine by 45.9 kcal/mol. The energies of fragmentation processes of methyl hypofluorite calculated from G2 theory are in agreement with those measured by Ruscic, Appelman, and Berkowitz [J. Chem. Phys. 95, 7957 (1991)] and support their interpretation of the photoionization data. The theoretical enthalpy of formation DELTA-H(f0)0 (CH3OF) of - 21.0 kcal/mol is in agreement with the experimental value (greater-than-or-equal-to 23.0 +/- 0.7 kcal/mol) derived from the photoionization data. The ordering of the O-F bond strengths in the series of molecules OF, HOF, and CH3 OF is OF > HOF > CH3 OF and the C-O bond strength is 6-8 kcal/mol weaker in methyl hypofluorite than in methanol. C1 CARNEGIE MELLON UNIV,DEPT CHEM,PITTSBURGH,PA 15213. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 10 TC 20 Z9 20 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 7962 EP 7964 DI 10.1063/1.461326 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500018 ER PT J AU NORWOOD, K ALI, A NG, CY AF NORWOOD, K ALI, A NG, CY TI A PHOTOELECTRON-PHOTOION COINCIDENCE STUDY OF H2O, D2O, AND (H2O)2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EXCITED-STATES; IONIZATION; MOLECULES; SPECTRUM; IONS; SPECTROSCOPY; LIFETIMES; DIMER; N2O AB Photoelectron-photoion coincidence (PEPICO) data for OH+ (OD+), H+ (D+), and H2O+ (D2O+) from H2O (D2O) have been obtained in the region of 625-700 angstrom. The PEPICO measurements allow the construction of breakdown diagrams for the unimolecular dissociation of energy-selected H2O+ and D2O+ in the B2B2 state. The breakdown diagrams for H2O+ (B2B2) and D2O+ (B2B2) in the internal energy range of 129-166 kcal/mol are essentially identical. The branching ratios observed for H+ (D+) are higher than those reported previously. About 3%-5% of stable H2O+ (D2O+) is observed in the time scale of almost-equal-to 10-mu-s. These stable H2O+ (D2O+) ions are attributed to ultrafast B2B2 --> A2A1 nonradiative relaxation followed by the radiative stabilization from H2O+ (A2A1) [D2O+ (A2A1)] to H2O+ (X2B1) [D2O+ (X2B1)]. This observation also supports that the formation of H+ (D+) via the H2O+ (A2A1) [D2O+ (A2A1)] state is a viable process. The relative state-selected cross sections for the reaction H2O+ (X2B1,A2A1; nu-1, nu-2) + H2O --> H3O+ + H at center-of-mass collision energies less-than-or-equal-to 1.9 eV have been examined using an effusive beam arrangement. Experiment evidence supports that vibrational and electronic excitations suppress the cross section of the latter reaction. We have also performed PEPICO measurements of the processes, (H2O)2 + h-nu --> (H2O)2+ + e- and H3O+ + OH + e-, in the region of 1020-1110 angstrom. The sums of the PEPICO intensities for H3O+ and (H2O)2+ at corresponding photoionization wavelengths yield the photoelectron spectrum for (H2O)2. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NASA,GODDARD SPACE FLIGHT CTR,ASTROCHEM BRANCH,GREENBELT,MD 20771. RP NORWOOD, K (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 28 TC 28 Z9 28 U1 0 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 8029 EP 8037 DI 10.1063/1.461334 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500026 ER PT J AU SUITS, AG HOU, HT DAVIS, HF LEE, YT MESTDAGH, JM AF SUITS, AG HOU, HT DAVIS, HF LEE, YT MESTDAGH, JM TI REACTION GEOMETRY FROM ORBITAL ALIGNMENT DEPENDENCE OF ION-PAIR PRODUCTION IN CROSSED-BEAM BA(1P1)-BR2 REACTIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ELASTIC-SCATTERING MEASUREMENTS; ELECTRONIC-ENERGY TRANSFER; INTERMOLECULAR POTENTIALS; SEMICLASSICAL CALCULATIONS; RAINBOW SCATTERING; EXCITED SODIUM; COLLISIONS; ATOMS; POLARIZATION; STATE AB Strong orbital alignment dependence was observed for Ba+ produced in crossed-beam reaction of Ba(1P1) with Br2. The peak of this dependence varied strongly with scattering angle for alignment of the p orbital in the scattering plane, with the maximum flux seen for perpendicular alignment with respect to the relative velocity vector. The measured Ba+ was always favored by alignment of the orbital in the scattering plane, regardless of laboratory scattering angle. The experimental results suggest that this charge-transfer process is dominated by large impact-parameter collisions which achieve collinear nuclear geometry and SIGMA-orbital alignment at the crossing point. Orbital locking is probably not important owing to the large internuclear distance of the crossing region. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. CENS,SERV PHOTONS ATOMES & MOLECULES,F-91191 GIF SUR YVETTE,FRANCE. RP SUITS, AG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 55 TC 30 Z9 30 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 8178 EP 8187 DI 10.1063/1.461297 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500041 ER PT J AU BRAUNSTEIN, M HAY, PJ MARTIN, RL PACK, RT AF BRAUNSTEIN, M HAY, PJ MARTIN, RL PACK, RT TI THE LOWEST EXCITED 1A2 AND 1B1 STATES OF OZONE - 2 CONICAL INTERSECTIONS AND THEIR IMPACT ON PHOTODISSOCIATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POTENTIAL-ENERGY SURFACES; PHOTO-DISSOCIATION; ABSORPTION-SPECTRA; SPECTROSCOPY; MOLECULES; DYNAMICS; O-3; ION AB We report results of ab initio configuration-interaction calculations on the lowest excited 1A2 and 1B1 states of ozone near their C2-upsilon minima and also at several nearby C(s) geometries, where these two states become the lowest 1A" states. We find that in C2-upsilon symmetry these two states have a seam intersection very near the 1B1 minimum which becomes a conical intersection for small distortions to C(s) geometries. The influence of this intersection on the Wulf and Chappuis bands of ozone is discussed and a new interpretation of these bands is presented. We also demonstrate the existence of a second conical intersection involving these same two states for D3h symmetries, where they become degenerate components of a 1E" state. RP UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, T-12, MS B268, LOS ALAMOS, NM 87545 USA. NR 26 TC 60 Z9 61 U1 2 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 8239 EP 8247 DI 10.1063/1.461302 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500046 ER PT J AU SHAFFER, JS CHAKRABORTY, AK TIRRELL, M DAVIS, HT MARTINS, JL AF SHAFFER, JS CHAKRABORTY, AK TIRRELL, M DAVIS, HT MARTINS, JL TI THE NATURE OF THE INTERACTIONS OF POLY(METHYL METHACRYLATE) OLIGOMERS WITH AN ALUMINUM SURFACE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; METAL-POLYMER INTERFACES; HYDROGEN CHEMISORPTION; BINDING-ENERGIES; XPS SPECTRA; POLYIMIDE; DENSITY; MODEL; APPROXIMATIONS; PHOTOEMISSION AB Polymer-metal interfaces are of increasing technological importance in a variety of applications. These interfaces are characterized by specific interactions between functional groups of the organic polymer and the metallic substrate. In order to study the structure of these interfaces at the molecular level, the energetics of the segment-surface interactions must be well characterized. We have used density functional theory to investigate the interactions of poly(methyl methacrylate) (PMMA) oligomers with aluminum surfaces. The aluminum surface is represented by the simple jellium model. The energetics of the interactions between the organic molecules and the aluminum surface are calculated as a function of the orientation with respect to the surface of the organic molecule and various internal degrees of freedom. The computed energy hypersurfaces exhibit a rich structure characterized by several energy minima and barriers. Implications of such an energy hypersurface for the architecture of long chain molecules at the interface are discussed. The energy hypersurfaces also show that the rotational conformational statistics of PMMA interacting with an aluminum surface should be quite different from that of bulk PMMA. The reported energy hypersurfaces have been used to construct an empirical force-field for future molecular simulations of long chains subject to the proper potentials. C1 UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV MINNESOTA, DEPT CHEM ENGN & MAT SCI, MINNEAPOLIS, MN 55455 USA. RI Martins, Jose Luis/F-3888-2011 OI Martins, Jose Luis/0000-0002-9061-967X NR 49 TC 23 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 8616 EP 8630 DI 10.1063/1.461240 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500088 ER PT J AU KRESS, JD AF KRESS, JD TI ACCURATE 3-DIMENSIONAL QUANTUM CUMULATIVE REACTION PROBABILITIES FOR NE+H2+-]NEH++H SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID SCATTERING RP KRESS, JD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, T-12, MS B268, LOS ALAMOS, NM 87545 USA. NR 13 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1991 VL 95 IS 11 BP 8673 EP 8674 DI 10.1063/1.461252 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GR665 UT WOS:A1991GR66500100 ER PT J AU ZINKLE, SJ HALTOM, CP JENKINS, LC DUBOSE, CKH AF ZINKLE, SJ HALTOM, CP JENKINS, LC DUBOSE, CKH TI TECHNIQUE FOR PREPARING CROSS-SECTION TRANSMISSION ELECTRON-MICROSCOPE SPECIMENS FROM ION-IRRADIATED CERAMICS SO JOURNAL OF ELECTRON MICROSCOPY TECHNIQUE LA English DT Article DE CROSS-SECTION SPECIMEN; CERAMIC; ION IMPLANTATION; MECHANICAL VISE; MICROSTRUCTURE ID FOILS; TEM AB The general techniques necessary to produce a high-quality cross-sectioned ceramic specimen for transmission electron microscope observation are outlined. A particularly important point is that the width of the glued region between faces of the ceramic specimen must be < 0.2-mu-m to prevent loss of the near-surface region during ion milling. A recently developed vise for gluing ceramic cross-section specimens is described, and some examples of the effect of glue thickness on specimen quality are shown. C1 OAK RIDGE NATL LAB,DIV PLANT & EQUIPMENT,OAK RIDGE,TN 37831. RP ZINKLE, SJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 16 TC 15 Z9 15 U1 1 U2 4 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0741-0581 J9 J ELECTRON MICR TECH PD DEC PY 1991 VL 19 IS 4 BP 452 EP 460 DI 10.1002/jemt.1060190407 PG 9 WC Biology; Microscopy SC Life Sciences & Biomedicine - Other Topics; Microscopy GA GP816 UT WOS:A1991GP81600006 PM 1797990 ER PT J AU NGUYEN, TD GRONSKY, R KORTRIGHT, JB AF NGUYEN, TD GRONSKY, R KORTRIGHT, JB TI CROSS-SECTIONAL TRANSMISSION ELECTRON-MICROSCOPY OF X-RAY MULTILAYER THIN-FILM STRUCTURES SO JOURNAL OF ELECTRON MICROSCOPY TECHNIQUE LA English DT Article DE CROSS-SECTIONAL SPECIMENS; ARTIFACTS; HRTEM; FRESNEL FRINGES; MULTILAYER STRUCTURES ID TEM; SPECIMENS; OPTICS AB A simple method for preparing cross-sectional transmission electron microscopy specimens and discussions of possible artifacts from specimen preparation and observation of x-ray multilayer thin film structures are presented. The specimen preparation method employs mechanical grinding and polishing to approximately 20-mu-m, followed by ion milling, without dimpling. Artifacts such as preferential ion milling and crystallization under the electron beam, as well as effects of Fresnel fringes at interfaces, are important factors in interpretation of the images. Care in identifying them is required to avoid erroneous results in studies of morphology and microstructures within the layers and at their interfaces. Example high-resolution TEM results of cross-sectional W/C, Ru/C, and Mo/Si multilayers are presented. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP NGUYEN, TD (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR XRAY OPT,MS 2-400,BERKELEY,CA 94720, USA. NR 33 TC 7 Z9 7 U1 2 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0741-0581 J9 J ELECTRON MICR TECH PD DEC PY 1991 VL 19 IS 4 BP 473 EP 485 DI 10.1002/jemt.1060190410 PG 13 WC Biology; Microscopy SC Life Sciences & Biomedicine - Other Topics; Microscopy GA GP816 UT WOS:A1991GP81600009 PM 1797992 ER PT J AU WANLASS, MW COUTTS, TJ WARD, JS EMERY, KA HORNER, GS AF WANLASS, MW COUTTS, TJ WARD, JS EMERY, KA HORNER, GS TI HIGH-EFFICIENCY, THIN-FILM INP CONCENTRATOR SOLAR-CELLS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE INP; HETEROEPITAXY; SOLAR CELLS AB High-efficiency, thin-film InP solar cells grown heteroepitaxially on GaAs and Si single-crystal bulk substrates are being developed as a means of eliminating the problems associated with using single-crystal InP substrates (e.g., high cost, fragility, high mass density and low thermal conductivity). A novel device structure employing a compositionally graded GaxIn1-xAs layer (approximately 8-mu-m thick) between the bulk substrate and the InP cell layers is used to reduce the dislocation density and improve the minority carrier properties in the InP. The structures are grown in a continuous sequence of steps using computer-controlled atmospheric-pressure metalorganic vapor-phase epitaxy (AP-MOVPE). Dislocation densities as low as 3 x 10(7) cm-2 and minority carrier lifetimes as high as 3.3 ns are achieved in the InP layers with this method using both GaAs or Si substrates. Structures prepared in this fashion are also completely free of microcracks. These results represent a substantial improvement in InP layer quality when compared to heteroepitaxial InP prepared using conventional techniques such as thermally cycled growth and post-growth annealing. The present work is concerned with the fabrication and characterization of thin-film InP solar cells designed for operation at high solar concentration (approximately 100 suns) which have been prepared from similar device structures grown on GaAs substrates. The cell performance is characterized as a function of the air mass zero (AMO) solar concentration ratio (1-100 suns) and operating temperature (25-degrees-80-degrees-C). From these data, the temperature coefficients of the cell performance parameters are derived as a function of the concentration ratio. Under concentration, the cells exhibit a dramatic increase in efficiency and an improved temperature coefficient of efficiency. At 25-degrees-C, a peak conversion efficiency of 18.9% (71.8 suns, AMO spectrum) is reported. At 80-degrees-C, the peak AMO efficiency is 15.7% at 75.6 suns. These are the highest efficiencies yet reported for InP heteroepitaxial cells. Approaches for further improving the cell performance are discussed. RP WANLASS, MW (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. NR 15 TC 3 Z9 3 U1 0 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD DEC PY 1991 VL 20 IS 12 BP 1019 EP 1024 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA GU899 UT WOS:A1991GU89900011 ER PT J AU OBOT, NT JENDRZEJCZYK, JA WAMBSGANSS, MW AF OBOT, NT JENDRZEJCZYK, JA WAMBSGANSS, MW TI DIRECT DETERMINATION OF THE ONSET OF TRANSITION TO TURBULENCE IN FLOW PASSAGES SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID PIPE AB Easily applied methods are proposed, based on tests with air and water, for direct determination of the onset of transition in flow passages using static and dynamic wall pressure data. With increasing Reynolds number from laminar flow, the characteristic feature of transition is the change from steady to oscillating pressure readings. It is established that the power spectral density (psd) representations exhibit a distinctive change in profile at transition. Further, it is shown that the root-mean-square (rms) values of the wall pressure fluctuations rise sharply at transition. The critical Reynolds numbers recorded via the change from steady to unsteady pressure readings are almost the same as those deduced from the psd and rms pressure data or from the familiar friction factor-Reynolds number plots. C1 CLARKSON UNIV,DEPT CHEM ENGN,FLUID MECH HEAT & MASS TRANSFER,POTSDAM,NY 13699. ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. NR 11 TC 6 Z9 6 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD DEC PY 1991 VL 113 IS 4 BP 602 EP 607 DI 10.1115/1.2926522 PG 6 WC Engineering, Mechanical SC Engineering GA HP712 UT WOS:A1991HP71200013 ER PT J AU TORCZYNSKI, JR AF TORCZYNSKI, JR TI PARTIAL ACOUSTIC FILTERING APPLIED TO THE EQUATIONS OF COMPRESSIBLE FLOW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Note ID MOTION AB Gas contained in a rectangular laser cell of large length and small width is subjected to large, transient, spatially nonuniform, volumetric heating when pumped. The heating time scale is much longer than the time required for an acoustic wave to traverse the width but can be comparable to the time required for an acoustic wave to traverse the length. Approximate equations describing the motion are derived by applying partial acoustic filtering to the equations of motion: pressure waves traversing the width are removed while pressure waves transversing the length are retained. For a simplified one-dimensional example, a significant density variation is found across the width of the laser cell; moreover, this density variation is in good agreement with a numerical solution of the unapproximated gas dynamic equations although the latter requires two orders of magnitude more computational time. C1 SANDIA NATL LABS,DEPT FLUID & THERMAL SCI,TECH STAFF,ALBUQUERQUE,NM 87185. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD DEC PY 1991 VL 113 IS 4 BP 709 EP 712 DI 10.1115/1.2926541 PG 4 WC Engineering, Mechanical SC Engineering GA HP712 UT WOS:A1991HP71200030 ER PT J AU ONSAGER, TG THOMSEN, MF ELPHIC, RC GOSLING, JT AF ONSAGER, TG THOMSEN, MF ELPHIC, RC GOSLING, JT TI MODEL OF ELECTRON AND ION DISTRIBUTIONS IN THE PLASMA SHEET BOUNDARY-LAYER SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID KINETIC ALFVEN WAVES; EARTHS BOW SHOCK; SUBSTORM RECOVERY; ELECTROMAGNETIC INSTABILITIES; ISEE OBSERVATIONS; GEOMAGNETIC TAIL; MAGNETOTAIL; DYNAMICS; PARTICLE; FIELD AB Electron and ion velocity space distributions in the plasma sheet boundary layer have distinct features and exhibit a characteristic evolution with depth in the boundary layer. Near the lobeward edge of the layer, enhanced earthward and tailward directed electron flux is observed. Somewhat deeper in the boundary layer, earthward and tailward directed ion beams are observed. The electron and ion beams have low-speed cutoffs, and the earthward directed beams are consistently observed at lower speeds than the simultaneously observed tailward directed beams. The ion distributions evolve from magnetic-field-aligned beams, to "kidney bean" shaped distributions, to isotropic shells with increasing equatorward penetration into the boundary layer. A two-dimensional model based on quasi-steady reconnection occurring in the distant magnetotail is able to reproduce all of these observed features in the electron and ion distribution functions. The essential features of the model are the finite time-of-flight effect (velocity filter effect), conservation of energy, and conservation of magnetic moment as the particles stream from the low magnetic field region near the central plasma sheet to the higher field region in the boundary layer. The model can be used to estimate the central plasma sheet density, temperature, and bulk flow speed as functions of position earthward of a reconnection site from observed plasma sheet boundary layer distributions. These plasma distributions obtained from the model may be useful in determining the stability of the boundary layer plasma to various electrostatic and electromagnetic modes. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP ONSAGER, TG (reprint author), UNIV NEW HAMPSHIRE,INST EARTH OCEANS & SPACE,DURHAM,NH 03824, USA. NR 41 TC 103 Z9 106 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 JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 20999 EP 21011 DI 10.1029/91JA01983 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800003 ER PT J AU MCKEAN, ME WINGLEE, RM AF MCKEAN, ME WINGLEE, RM TI A MODEL FOR THE FREQUENCY FINE-STRUCTURE OF AURORAL KILOMETRIC RADIATION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MASER SYNCHROTRON INSTABILITY; INHOMOGENEOUS-MEDIUM; GENERATION; SOLAR; ELECTRONS; ISEE-1; BURSTS; GROWTH AB One of the more interesting and as yet unexplained features of auroral kilometric radiation (AKR) is the frequency fine structure observed in wideband spectrograms. This fine structure consists of emission features that drift in frequency with time, and of banded emission structure. Both positive and negative drifts are observed. While the electron cyclotron maser instability is widely believed to be the source of AKR, no proposed explanation for the frequency fine structure seen in AKR has been confirmed. In this paper, we propose a model for AKR frequency fine structure in which the fine structure is a natural consequence of the emission of electron cyclotron maser radiation in a nonuniform magnetic field. This model is examined by using one-dimensional, electromagnetic, particle-in-cell simulations. We find that maser radiation is emitted as individual wave packets that combine to form the drifting emission features that make up the fine structure. Rising frequency drifts are associated with wave packets emitted independently of one another. Wave packets that interact with one another produce features with falling frequency drift. Combinations of these wave packets can produce features that rise and fall. Both X mode radiation and O mode radiation produce fine structure with narrowband, drifting emissions. The emission features produced have a large spread in both positive and negative frequency drift rates. We find that the average positive drift rate of rapidly drifting features is approximately proportional to the maser growth rate. On the other hand, the average negative drift rate of rapidly drifting features remains approximately constant. For slowly drifting features, specifically, features with drifts that may be close to observed drift rates, both the positive and negative drift rates are approximately proportional to the magnetic field gradient. C1 UNIV COLORADO, DEPT ASTROPHYS PLANETARY & ATMOSPHER SCI, BOULDER, CO 80309 USA. RP MCKEAN, ME (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, MS D438, LOS ALAMOS, NM 87545 USA. NR 29 TC 10 Z9 10 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9380 EI 2169-9402 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21055 EP 21070 DI 10.1029/91JA01954 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800007 ER PT J AU CHENG, CZ AF CHENG, CZ TI A KINETIC-MAGNETOHYDRODYNAMIC MODEL FOR LOW-FREQUENCY PHENOMENA SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID GYROKINETIC EQUATIONS; DRIFT INSTABILITIES; PLASMA; WAVES; MAGNETOSPHERE; EXCITATION; PULSATIONS AB A hybrid kinetic-magnetohydrodynamic (MHD) model is presented for describing low-frequency phenomena in high-beta (beta approximately O(1)) anisotropic plasmas that consist of two components: a low-energy core component and an energetic component with low density. The kinetic-MHD model treats the low-energy core component by magnetohydrodynamic description, the energetic component by a kinetic approach such as the gyrokinetic equation, and the coupling between the dynamics of these two components through plasma pressure in the momentum equation. The kinetic-MHD model optimizes both the physics contents and the theoretical efforts in studying low-frequency MHD waves and transport phenomena in general magnetic field geometries and can be easily modified to include the core plasma kinetic effects if necessary. It is applicable to any magnetized collisionless plasma system where the parallel electric field effects are negligibly small. In the linearized limit, two coupled eigenmode equations for describing the coupling between the transverse Alfven type and the compressional Alfven type waves are derived. The eigenmode equations are identical to those derived from the full gyrokinetic equation in the low-frequency limit and were previously analyzed both analytically and numerically to obtain the eigenmode structure of the drift mirror instability (Cheng and Lin, 1987) which explains successfully the multisatellite observation of the antisymmetric field-aligned structure of the compressional magnetic field of Pc 5 waves (Takahashi et al., 1987) in the magnetospheric ring current plasma. Finally, a quadratic form is derived to demonstrate the stability of the low-frequency transverse and compressional Alfven type instabilities in terms of the pressure anisotropy parameter tau and the magnetic field curvature-pressure gradient parameter alpha-p as defined in equations (31) and (69), respectively. A procedure for determining the stability of a marginally stable MHD wave due to wave-particle resonances is also presented. RP CHENG, CZ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 37 TC 49 Z9 49 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 JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21159 EP 21171 DI 10.1029/91JA01981 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800017 ER PT J AU ONSAGER, TG WINSKE, D THOMSEN, MF AF ONSAGER, TG WINSKE, D THOMSEN, MF TI ION INJECTION SIMULATIONS OF QUASI-PARALLEL SHOCK RE-FORMATION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID EARTHS BOW SHOCK; SPECULARLY REFLECTED IONS; UPSTREAM SOLAR-WIND; LOW-FREQUENCY WAVES; COLLISIONLESS SHOCKS; PERPENDICULAR SHOCKS; ISEE-2 OBSERVATIONS; BEAM INSTABILITIES; LARGE-AMPLITUDE; FORESHOCK AB The process of quasi-parallel shock re-formation is investigated using one-dimensional hybrid simulations. These simulations are used to study the coupling of a beam of ions reflected at the shock to the incoming solar wind. We have constructed a simple simulation configuration that allows us to control the properties of the background plasma and of the reflected ions. The simulations initially do not contain a shock, but rather include a background plasma, corresponding to the solar wind, into which we inject a counterstreaming ion beam, corresponding to shock-reflected ions. We investigate the length and time scales for the coupling of the reflected ions to the background plasma as functions of theta-Bn, beam density, and beam temperature. This coupling can lead to the formation of shocklike structures upstream from the injection location which we associate with quasi-parallel shock re-formation. In addition, we have perturbed the upstream plasma in a controlled manner to study the effect of upstream waves on the coupling process. We find that the coupling length and time scales vary systematically with the upstream magnetic field direction, theta-Bn. The coupling occurs at roughly the time and location where the injected ions become deflected transverse to the shock normal direction. Also, as seen in previous quasi-parallel shock simulations, the reflected (injected) ions become trapped downstream of the newly forming shock by the growing perturbations. In this way, shock-reflected ions may contribute directly to the downstream ion temperature. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP ONSAGER, TG (reprint author), UNIV NEW HAMPSHIRE,INST STUDY EARTH OCEANS & SPACE,DURHAM,NH 03824, USA. NR 38 TC 24 Z9 25 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21183 EP 21194 DI 10.1029/91JA01986 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800019 ER PT J AU LEE, MA GARY, SP AF LEE, MA GARY, SP TI QUASI-LINEAR EVOLUTION OF ULF WAVES EXCITED BY COMETARY ION PICKUP SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID STRONG HYDROMAGNETIC TURBULENCE; SOLAR-WIND; GIACOBINI-ZINNER; ELECTROMAGNETIC INSTABILITIES; VELOCITY DISTRIBUTIONS; COMPUTER-SIMULATIONS; WATER GROUP; UP IONS; NEWBORN; HALLEY AB An analytical model is presented which describes the quasi-linear evolution of both ultralow-frequency (ULF) magnetic fluctuations and cometary ion flux in the solar wind due to continuous ion pickup. The derived solution yields both the initial exponential growth of the total wave intensity and the time-asymptotic growth proportional to time obtained in numerical simulations using a one-dimensional hybrid code with a constant rate of cometary ion injection (Gary et al., 1988, 1989). For pickup rates appropriate to cometary environments, the derived fluctuation intensity and pickup ion flux are in general accord with ULF wave observations and water group ion pitch angle distributions upstream of the bow waves at both comet Giacobini-Zinner and comet Halley. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP LEE, MA (reprint author), UNIV NEW HAMPSHIRE,CTR SPACE SCI,INST STUDY EARTH OCEANS & SPACE,SCI & ENGN RES BLDG,DURHAM,NH 03824, USA. NR 30 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21319 EP 21327 DI 10.1029/91JA01864 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800031 ER PT J AU FLESCH, GD NG, CY AF FLESCH, GD NG, CY TI ABSOLUTE STATE-SELECTED TOTAL CROSS-SECTIONS FOR THE O+(4S) + CO-2 REACTIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ATMOSPHERIC MODIFICATION EXPERIMENT; TO-STATE; + H; O+; O2+; DYNAMICS; ARECIBO; IONS; CO2 AB Absolute state-selected total cross sections for O2+, CO2+, CO+, and C+ resulting from the reaction O+(4S) + CO2 have been measured in the center-of-mass collision energy (E(c.m.)) range of 0.2-150 eV. The cross section for O2+ drops off rapidly with increasing E(c.m.) and becomes essentially zero at E(c.m.) > 3 eV. The charge transfer CO2+ is overwhelmingly the major product ion at E(c.m.) > 0.5 eV. The onsets measured for CO+ and C+ are consistent with the thermochemical thresholds for the formation of CO+ + 2O and C+ + 3O, respectively. C1 US DOE,AMES LAB,AMES,IA. RP FLESCH, GD (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,GILMAN HALL,AMES,IA 50011, USA. NR 29 TC 8 Z9 8 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21403 EP 21405 DI 10.1029/91JA02514 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800039 ER PT J AU FLESCH, GD NG, CY AF FLESCH, GD NG, CY TI ABSOLUTE STATE-SELECTED TOTAL CROSS-SECTIONS FOR THE O+(2D,2P) + N-2 REACTIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID TO-STATE; METASTABLE O+(D-2); RATE COEFFICIENT; CHARGE-EXCHANGE; THERMAL-ENERGY; ION REACTIONS; N2; DEPENDENCE; NITROGEN; OXYGEN AB Absolute state-selected total cross sections for the reactions O+(2D) (or O+(2P)) + N2 --> N2+ + O, NO+ + N, and N+ + NO (or N + O) have been measured in the center-of-mass (c.m.) collision energy (E(c.m.)) range of 1.3-25 eV. Charge transfer is overwhelmingly the major product channel. The ratios of the charge transfer cross section due to O+(2P) to that associated with O+(2D) at the corresponding E(c.m.) are found to be in the range of 0.71-0.88. The cross sections for N+ resulting from the O+(2D,2P) + N2 reactions are significantly greater than those formed by the O+(4S) + N2 reaction. The E(c.m.) dependences observed for the N+ cross section indicate that the formation of N+ + NO from the collision of O+(2P) + N2 is a viable process, whereas N+ formed in the O+(2D) + N2 reaction is mainly associated with the N+ + N + O channel. C1 US DOE,AMES LAB,AMES,IA. RP FLESCH, GD (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 29 TC 7 Z9 7 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21407 EP 21410 DI 10.1029/91JA02375 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800040 ER PT J AU SIEGRIST, RL AF SIEGRIST, RL TI VOLATILE ORGANIC-COMPOUNDS IN CONTAMINATED SOILS - THE NATURE AND VALIDITY OF THE MEASUREMENT PROCESS SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article AB A wide variety of volatile organic compounds (VOCs) such as toluene and trichloroethene routinely appear as principal pollutants in contaminated sites. As part of the site assessment and environmental restoration process, quantitative determination of soil VOCs is required. While accurate and precise measurements are desired, the validity of the current process in which a discrete sample is collected and a 1 to 5 g subsample is analyzed for a suite of organic compounds of widely different properties is questionable. Research has demonstrated that the soil VOC measurement process is complex and current, commonly employed practices can lead to substantial measurement errors. For example, -100 to +25% bias can occur in measurements of some soil VOCs. Knowledge of VOC behavior in soils and the measurements process continues to expand and advances are being made in sampling and analysis techniques. Further research is needed to enable development of a valid soil VOC measurement process. RP SIEGRIST, RL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD DEC PY 1991 VL 29 IS 1 BP 3 EP 15 DI 10.1016/0304-3894(91)87071-9 PG 13 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA GW542 UT WOS:A1991GW54200002 ER PT J AU GATTEN, RE CONGDON, JD MAZZOTTI, FJ FISCHER, RU AF GATTEN, RE CONGDON, JD MAZZOTTI, FJ FISCHER, RU TI GLYCOLYSIS AND SWIMMING PERFORMANCE IN JUVENILE AMERICAN ALLIGATORS SO JOURNAL OF HERPETOLOGY LA English DT Article ID SALT-WATER CROCODILE; CROCODYLUS-POROSUS; ANAEROBIC METABOLISM; TEMPERATURE; AMPHIBIANS; REPTILES; BEHAVIOR; MASS AB Swimming speed of juvenile American alligators increased between 15 and 20 C but not between 20 and 30 C. Speed declined with time during the 4 min trials. Post-exercise lactate concentration increased with temperature and with duration of swimming. The rate of lactate formation during exercise increased with temperature and was higher in the first min of excerise than in the subsequent 3 min. Once the effects of temperature, body mass, and body length were removed, there was no relationship between the intensity of glycolysis and the distance covered in 1 min of swimming. In contrast, the alligators that swam the greatest distance in 4 min had the lowest lactate concentration. Thus, the relationship between the intensity of glycolysis and distance traveled varies with the duration of exertion in these animals during induced swimming. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. UNIV FLORIDA,BROWARD CTY EXTENS OFF,DEPT WILDLIFE & RANGE SCI,DAVIE,FL 33314. RP GATTEN, RE (reprint author), UNIV N CAROLINA,DEPT BIOL,GREENSBORO,NC 27412, USA. NR 25 TC 12 Z9 12 U1 1 U2 3 PU SOC STUDY AMPHIBIANS REPTILES PI OXFORD PA MIAMI UNIV, DEPT ZOOLOGY, OXFORD, OH 45056 SN 0022-1511 J9 J HERPETOL JI J. Herpetol. PD DEC PY 1991 VL 25 IS 4 BP 406 EP 411 DI 10.2307/1564761 PG 6 WC Zoology SC Zoology GA GX005 UT WOS:A1991GX00500003 ER PT J AU BRANDT, LA AF BRANDT, LA TI LONG-TERM CHANGES IN A POPULATION OF ALLIGATOR-MISSISSIPPIENSIS IN SOUTH-CAROLINA SO JOURNAL OF HERPETOLOGY LA English DT Article ID NORTH-CENTRAL FLORIDA; ECOLOGY; SEX AB The status of the American alligator in a man-made reservoir in South Carolina was determined through the use of mark-recapture and mark-resighting techniques. Results were compared to studies conducted during the 1970s to determine changes in population size, population structure, and number of nests. Over the last 14 years the number of alligators in Par Pond has more than doubled (from an estimated 110 to 266), and the size structure of the population has shifted from one with a high proportion of large adults to one with a high proportion of juveniles (less-than-or-equal-to 1.8 m). The sex ratio of animals captured from 1986-1989 (2.6 male : 1 female) was similar to that found in the 1970s (3.2:1; Murphy, 1977). The number of nests and the number of successful nests was variable among years, ranging from no nests in 1986 to 8 nests in 1988 for an average of 4.0 nests per year, an increase from the 2.3 observed during the 1970s. Overall, the alligator population in Par Pond appears to be quite healthy, showing an overall average annual exponential rate of increase (r.p.a) of 6% and a juvenile r.p.a of 10%. It is expected that the population will continue to increase in size, but that the average annual exponential rate of increase will decrease as the carrying capacity of Par Pond is reached. C1 FLORIDA INT UNIV,DEPT BIOL SCI,MIAMI,FL 33199. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 35 TC 17 Z9 18 U1 3 U2 13 PU SOC STUDY AMPHIBIANS REPTILES PI OXFORD PA MIAMI UNIV, DEPT ZOOLOGY, OXFORD, OH 45056 SN 0022-1511 J9 J HERPETOL JI J. Herpetol. PD DEC PY 1991 VL 25 IS 4 BP 419 EP 424 DI 10.2307/1564763 PG 6 WC Zoology SC Zoology GA GX005 UT WOS:A1991GX00500005 ER PT J AU COBURN, MD BUNTAIN, GA HARRIS, BW HISKEY, MA LEE, KY OTT, DG AF COBURN, MD BUNTAIN, GA HARRIS, BW HISKEY, MA LEE, KY OTT, DG TI AN IMPROVED SYNTHESIS OF 3,6-DIAMINO-1,2,4,5-TETRAZINE .2. FROM TRIAMINOGUANIDINE AND 2,4-PENTANEDIONE SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Note AB A new synthesis for the title compound that gives an 80% overall yield was developed. Treatment of triaminoguanidine monohydrochloride (1) with 2,4-pentanedione (2) gave 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2-dihydro-1,2,4,5-tetrazine (3) in 80-85% yield. Oxidation of 3 with nitric oxide or nitrogen dioxide to 3,6-bis(3,5-dimethyylpyrazol-1-yl)-1,2,4,5-tetrazine (4) followed by ammonolysis of 4 gave 3,6-diamino-1,2,4,5-tetrazine (5) in guantitatively yields. RP COBURN, MD (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 4 TC 97 Z9 106 U1 1 U2 18 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD DEC PY 1991 VL 28 IS 8 BP 2049 EP 2050 PG 2 WC Chemistry, Organic SC Chemistry GA JR417 UT WOS:A1991JR41700044 ER PT J AU CONOVER, MJ BRODSKY, MB MATTSON, JE SOWERS, CH BADER, SD AF CONOVER, MJ BRODSKY, MB MATTSON, JE SOWERS, CH BADER, SD TI MAGNETOTHERMOPOWER OF FE/CR SUPERLATTICES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Letter ID GIANT MAGNETORESISTANCE; MULTILAYERED STRUCTURES; FE AB We report magnetothermopower S(H) measurements at room temperature for sputtered [Fe(32 angstrom)/Cr(x)]30 superlattices with x almost-equal-to 5-50 angstrom. The thermopower in zero field S(H = 0) appears to extrapolate to the known values for Fe and Cr in the x = 0 and large-x limits, respectively, and drops below these values at intermediate x. S follows the same trend with H and x as the magnetoresistance (MR), which shows oscillatory behavior as a function of x, and large field effects for antiferromagnetic Fe interlayer couplings. Both S(H) and the MR saturate when the applied field aligns the magnetization of the Fe-layers parallel to each other, but the thermopower is enhanced by application of a magnetic field, while the resistivity decreases, in accord with expectation. C1 NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60208. RP CONOVER, MJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 27 TC 36 Z9 36 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD DEC PY 1991 VL 102 IS 1-2 BP L5 EP L8 DI 10.1016/0304-8853(91)90255-9 PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA GX039 UT WOS:A1991GX03900002 ER PT J AU ZHU, YM ZHANG, H WANG, H SUENAGA, M AF ZHU, YM ZHANG, H WANG, H SUENAGA, M TI GRAIN-BOUNDARY IN TEXTURED YBA2CU3O7-DELTA SUPERCONDUCTOR SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID BICRYSTALS; ORIENTATIONS; CRYSTALS; GROWTH; AUGER; MGO; JC AB The misorientations of over 200 pairs of adjacent grains separated by grain boundaries in textured YBa2Cu3O7-delta were measured using a transmission electron microscopy technique. The results indicate that there exist discrete preferred rotation angles and rotation axes. The existence of low-energy boundaries is inferred. The results are analyzed based on the Constrained Coincidence Site Lattice (CCSL) and O2-lattice theories and imply the applicability of such theories for the case of large-angle grain boundaries in a complex crystal structure such as YBa2Cu3O7-delta. The results of analysis also show that some boundaries are likely to be reduced in oxygen near the boundary to satisfy the constraint of the coincidence site lattice. C1 SUNY STONY BROOK,DEPT MAT SCI,STONY BROOK,NY 11794. RP ZHU, YM (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 33 TC 51 Z9 51 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1991 VL 6 IS 12 BP 2507 EP 2518 DI 10.1557/JMR.1991.2507 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA GU339 UT WOS:A1991GU33900003 ER PT J AU LUCAS, BN OLIVER, WC WILLIAMS, RK BRYNESTAD, J OHERN, ME AF LUCAS, BN OLIVER, WC WILLIAMS, RK BRYNESTAD, J OHERN, ME TI THE HARDNESS AND YOUNGS MODULUS OF BULK YBA2CU3O7-X (1-2-3) AND YBA2CU4O8 (1-2-4) AS DETERMINED BY ULTRA LOW LOAD INDENTATION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CRITICAL CURRENTS; GRAIN-BOUNDARIES; SUPERCONDUCTORS; BA2YCU3O7-X AB Using a highly-spatially-resolved mechanical properties microprobe, the Young's modulus and hardness of bulk YBa2Cu3O7-x (1:2:3) and YBa2Cu4O8 (1:2:4) have been determined. The Young's modulus of a superconductor is an important parameter in determining critical grain sizes above which microcracking will occur due to anisotropic thermal stresses that arise during processing. This phenomenon of microcracking has been determined to cause a decrease in the attainable critical current densities in bulk superconductors. The mechanical properties data for these two materials show that the Young's modulus of 1:2:3 is approximately 35% greater than the modulus of 1:2:4. This along with available anisotropic thermal expansion data for 1:2:3 and 1:2:4 suggests that the critical grain size for 1:2:4 is about 7 times greater than the critical grain size for microcracking in 1:2:3. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. NANO INSTRUMENTS INC,KNOXVILLE,TX. RP LUCAS, BN (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 20 TC 9 Z9 9 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1991 VL 6 IS 12 BP 2519 EP 2522 DI 10.1557/JMR.1991.2519 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA GU339 UT WOS:A1991GU33900004 ER PT J AU RAMAN, SV SUN, YY MATSUISHI, K QUAN, X AF RAMAN, SV SUN, YY MATSUISHI, K QUAN, X TI DIFFUSIONAL TRANSFORMATION AND STRUCTURAL RELAXATION IN Y1BA2CU3-XNIXO7-Z COMPOUNDS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID OXYGEN; SUPERCONDUCTIVITY AB In this paper the mechanism of phase transition and structural relaxation are elucidated by means of model experiments in the differential scanning calorimeter. Materials for this study were varied in structure and oxygen content by the introduction of Ni for Cu, through co-precipitation of oxolate gels, calcination, and sintering in ambient atmosphere. Both relaxation and phase transition are revealed by scrutinizing the heating rate dependence of heat capacity, and they seem to occur contemporaneously. Two higher order transitions are observed and are characterized by activation energies of 186 kJ/mole and 550 kJ/mole at the low and high temperatures, respectively. Perhaps the first transition is of a displacive type and occurs in anticipation of a reconstructive structural change from a fourfold chain to a sixfold sheet-like configuration. It is delineated by a change in relaxation kinetics from a localized type to a cooperative type with activation energies of 36 and 10 kJ/mole, respectively. The cooperative relaxation occurs at higher temperatures and is kinetically continuous across the reconstructive transition region. The structure characteristic exponent has a value of 0.70 for both localized and cooperative relaxation and resembles the two-dimensional relaxation often observed in depolymerized glasses. With kinetic impediment the transition region seems to approach a lambda-like behavior. In the subtransitional region, impediments in relaxation are useful in delineating oxygen stoichiometric differences between samples. The above discussion is supported by the structural and chemical characteristics that were gathered by x-ray powder diffraction, Raman spectroscopy, scanning electron microscopy and microprobe, and low temperature resistance measurements on Y123 samples containing 5 and 10 at. % Ni, respectively. C1 UNIV HOUSTON,DEPT PHYS,TEXAS CTR SUPERLOND,HOUSTON,TX 77204. RP RAMAN, SV (reprint author), WESTINGHOUSE IDAHO NUCL CO INC,IDAHO NATL ENGN LAB,BOX 4000,IDAHO FALLS,ID 83403, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1991 VL 6 IS 12 BP 2523 EP 2534 DI 10.1557/JMR.1991.2523 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA GU339 UT WOS:A1991GU33900005 ER PT J AU HOAGLAND, RG DAW, MS HIRTH, JP AF HOAGLAND, RG DAW, MS HIRTH, JP TI SOME ASPECTS OF FORCES AND FIELDS IN ATOMIC MODELS OF CRACK TIPS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB This paper examines the stresses and displacement gradients in atomistic models of cracks based on an EAM potential devised for aluminum. Methods for computing these quantities are described. Results are presented for two models differing in terms of the orientations of the crack relative to the crystal, a [100] (010) orientation that behaves in a brittle fashion and a [111] (110) orientation that emits partial dislocations prior to extending. Both models display lattice trapping. The stresses in the brittle crack model are compared with the linear elastic prediction and found to be in remarkably good agreement to within distances of about one lattice parameter of the crack tip and at the free surface where contributions from sources other than strain energy (e.g., surface tension) influence the results. Similar results are observed for the ductile model until dislocation emission occurs. The largest stresses that develop just prior to crack extension or dislocation emission are used to estimate the ratio of theoretical tensile strength to shear strength in this material. Eshelby's conservation integrals, F and M, are also computed. F is found to be essentially contour independent and in agreement with the linear elastic prediction in both models until dislocation emission occurs, at which point a large screening contribution arises from the emitted partials. The contour size dependence of M reveals some interesting features of the crack tip including a slight wobble of the crack tip inside its potential well with changing applied K and the existence of forces acting to move the crack faces apart as blunting occurs. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP HOAGLAND, RG (reprint author), WASHINGTON STATE UNIV,PULLMAN,WA 99164, USA. RI Hoagland, Richard/G-9821-2012 NR 11 TC 55 Z9 56 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1991 VL 6 IS 12 BP 2565 EP 2577 DI 10.1557/JMR.1991.2565 PG 13 WC Materials Science, Multidisciplinary SC Materials Science GA GU339 UT WOS:A1991GU33900008 ER PT J AU KOESTER, DA MORE, KL DAVIS, RF AF KOESTER, DA MORE, KL DAVIS, RF TI DEFORMATION AND MICROSTRUCTURAL CHANGES IN SIC WHISKER-REINFORCED SI3N4 COMPOSITES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID PRESSED SILICON-NITRIDE; HIGH-TEMPERATURE MICROSTRUCTURE; INTERGRANULAR PHASE; COMPRESSIVE CREEP; ALLOYS AB Constant stress compressive creep studies have been conducted on hot-pressed Si3N4 containing 30 vol.% SiC whiskers and an initial vitreous phase composed of Al2O3, Y2O3, and SiO2. The conditions of temperature and stress were 1470-1670 K and 50-350 MPa, respectively; the atmosphere was purified N2 at 1 atm. Significant changes in the stress exponent and activation energy indicate a change in the controlling creep mechanism at almost-equal-to 225 MPa and 1570 K. Prolonged annealing in the unstressed condition reduced creep rates but had little effect on the stress exponent values. Transmission and scanning electron microscopy revealed that the break in the stress exponent curves was caused by the removal of the amorphous material at the grain boundary and resulting contacts between Si3N4 grains. The break in the activation energy curves is believed to be similarly related. Analysis of all the data indicates that the composite creeps via grain boundary sliding accommodated by viscous flow at low stresses and temperatures and by diffusion at high stresses and temperatures. The contributions of these two mechanisms varied measurably as a function of stress and temperature. No cavitation was observed. The presence of the SiC whiskers had no observable effect on deformation. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP KOESTER, DA (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,BOX 7907,RALEIGH,NC 27695, USA. RI Davis, Robert/A-9376-2011; More, Karren/A-8097-2016 OI Davis, Robert/0000-0002-4437-0885; More, Karren/0000-0001-5223-9097 NR 43 TC 7 Z9 7 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1991 VL 6 IS 12 BP 2735 EP 2746 DI 10.1557/JMR.1991.2735 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA GU339 UT WOS:A1991GU33900028 ER PT J AU GIBSON, ED VERHOEVEN, JD AF GIBSON, ED VERHOEVEN, JD TI ELECTROLYTIC CAPACITORS PRODUCED FROM DEFORMATION-PROCESSED 2-PHASE ALLOYS SO JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS LA English DT Article AB Arc cast Cu-Ta and powder processed Al-Ta and Al-Nb composite alloys have been examined as potential materials for making electrolytic capacitors. These two phase alloys can be severly cold-worked, deformation-processed, to produce Ta surface areas considerably larger than those possible with the powder processing used in current Ta capacitors. The three alloys were deformation-processed into sheet and rod form and then processed through anodization, electrolyte formation and cathode fabrication steps to make prototype capacitors. The capacitors were tested for capacitance, effective series resistance and leakage. The figure of merit, CVg-1, (capacitance x voltage per gram) values obtained closely approached those of currently manufactured capacitors but d.c. leakage values were unacceptably high using a solid electrolyte. To realize the full potential of this new method for fabricating Al-Ta capacitors further research is required to improve the deformation of the Ta powders and to find methods of anodization and solid-state electrolyte formation capable of maintaining oxide film integrity. RP GIBSON, ED (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0957-4522 J9 J MATER SCI-MATER EL JI J. Mater. Sci.-Mater. Electron. PD DEC PY 1991 VL 2 IS 4 BP 236 EP 243 DI 10.1007/BF00702929 PG 8 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA GX646 UT WOS:A1991GX64600011 ER PT J AU HALPERN, MB OBERS, NA AF HALPERN, MB OBERS, NA TI GENERALIZED GRAPHS AND UNITARY IRRATIONAL CENTRAL CHARGE IN THE SUPERCONFORMAL MASTER EQUATION SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID INFINITE-DIMENSIONAL ALGEBRAS; CONFORMAL FIELD-THEORIES; VIRASORO CONSTRUCTIONS; LIE-ALGEBRAS; 2 DIMENSIONS; AFFINE-G; MODELS; FERMIONS; REPRESENTATIONS; BOSONIZATION AB For each magic basis of Lie g, it is known that the Virasoro master equation on affine g contains a generalized graph theory of conformal level-families. In this paper, it is found that the superconformal master equation on affine g x SO(dim g) similarly contains a generalized graph theory of superconformal level-families for each magic basis of g. The superconformal level-families satisfy linear equations on the generalized graphs, and the first exact unitary irrational solutions of the superconformal master equation are obtained on the sine-area graphs of g = SU (n), including the simplest unitary irrational central charges c = 6nx/(nx + 8 sin2(rs-pi/n)) yet observed in the program. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP HALPERN, MB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Obers, Niels/D-1377-2014 OI Obers, Niels/0000-0003-4947-8526 NR 51 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 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD DEC PY 1991 VL 32 IS 12 BP 3231 EP 3240 DI 10.1063/1.529483 PG 10 WC Physics, Mathematical SC Physics GA GT036 UT WOS:A1991GT03600001 ER PT J AU REUTER, RC ALLEN, JJ AF REUTER, RC ALLEN, JJ TI PREDICTION OF MECHANICAL STATES IN WOUND CAPACITORS SO JOURNAL OF MECHANICAL DESIGN LA English DT Article AB The problem of determining the mechanical states inside wound capacitor rolls is addressed through the application of two dimensional, linear elasticity. Allowances are made for heterogeneous wound construction of the capacitor, orthotropic material behavior of the capacitor constituents, and arbitrary winding tension. A key element in the formulation is the derivation of material properties for a wound, orthotropic layer which is equivalent in behavior to a stack of dissimilar plies such as are actually wound on the capacitor simultaneously during one turn of the mandrel. The dissimilar plies are necessary by virtue of the conductor and dielectric materials which must be present in a capacitor. The derivation of predictive equations is based on winding the equivalent layer on an appropriate mandrel, followed by a recovery of the individual ply responses. The capability to explicitly calculate the winding tensions which would be necessary to produce a required wound tension dependence upon capacitor radius is also developed. Numerical results for typical capacitor design and construction are presented, and justification for the application of optimization theory in capacitor development is demonstrated. RP REUTER, RC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1050-0472 J9 J MECH DESIGN JI J. Mech. Des. PD DEC PY 1991 VL 113 IS 4 BP 387 EP 392 DI 10.1115/1.2912794 PG 6 WC Engineering, Mechanical SC Engineering GA HP765 UT WOS:A1991HP76500004 ER PT J AU ALLEN, JJ REUTER, RC AF ALLEN, JJ REUTER, RC TI OPTIMIZATION OF MECHANICAL STATES IN WOUND CAPACITORS SO JOURNAL OF MECHANICAL DESIGN LA English DT Article AB The winding process is encountered frequently in manufacturing, such as winding of polymer films and paper, laminated pressure vessel construction, and the manufacture of wound capacitors. The winding of capacitors will typically involve hundreds of plies of conductor and dielectric wound over a core. Due to the large number of layers, the calculation of the mechanical states within a wound capacitor is a significant computational task. Techniques for calculation of the mechanical states within a wound capacitor are derived and discussed in reference [1]. The focus of this paper is the formulation and application of optimization techniques for the design of wound capacitors. The design criteria to be achieved is a specified uniform wound tension in a capacitor. The paper will formulate an optimization statement of the wound capacitor design problem, develop a technique for reducing the numerical calculation required to repeatedly analyze the capacitor which is required by the optimization algorithm, and apply the technique to an example. The following effects will be investigated using the example. (1) The ability of low order winding tension profiles, such as constant, linear, or bilinear profiles, to meet the optimization objective. (2) The usefulness and practicality of high order winding tension profiles, which require a significant number of design variables to meet the optimization objective. (3) Differential weighting of the aluminum and mylar layer wound tensions in the objective function will be investigated as a technique for achieving the optimization/design goal. RP ALLEN, JJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1050-0472 J9 J MECH DESIGN JI J. Mech. Des. PD DEC PY 1991 VL 113 IS 4 BP 393 EP 401 DI 10.1115/1.2912795 PG 9 WC Engineering, Mechanical SC Engineering GA HP765 UT WOS:A1991HP76500005 ER PT J AU DAVIS, EA SINGH, A COX, SFJ KREITZMAN, SR ESTLE, TL HITTI, B LICHTI, RL LAMP, D DUVARNEY, R COOKE, DW PACIOTTI, M WRIGHT, AC AF DAVIS, EA SINGH, A COX, SFJ KREITZMAN, SR ESTLE, TL HITTI, B LICHTI, RL LAMP, D DUVARNEY, R COOKE, DW PACIOTTI, M WRIGHT, AC TI STUDIES OF MUON IMPLANTATION IN AMORPHOUS AND CRYSTALLINE SILICON SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY AB A study has been made of muons implanted into a-Si, a-Si:H, a-Si:D and, for comparison, polycrystalline Si. Resonance spectra were observed and measurements of the repolarisation of the promptly formed analogue of hydrogen, namely muonium, and of the fraction of muonium which reaches a diamagnetic state, were made. It is inferred that trapping sites exist, one of which is interstitial and the other bond-centred. A larger observed diamagnetic fraction in the amorphous samples is associated with muonium ionization by electron loss to tail states or to trapping at dangling bonds. C1 EMORY UNIV,DEPT PHYS,ATLANTA,GA 30322. RUTHERFORD APPLETON LAB,ISIS PULSED MUON FACIL,DIDCOT OX11 0QX,OXON,ENGLAND. TRIUMF,VANCOUVER V6T 2A6,BC,CANADA. UNIV CALIF LOS ALAMOS SCI LAB,LAMPF,LOS ALAMOS,NM 87545. RICE UNIV,DEPT PHYS,HOUSTON,TX 77257. UNIV READING,JJ THOMPSON PHYS LAB,READING RG6 2AF,BERKS,ENGLAND. TEXAS TECH UNIV,DEPT PHYS,LUBBOCK,TX 79409. RP DAVIS, EA (reprint author), UNIV LEICESTER,DEPT PHYS & ASTRON,LEICESTER LE1 7RH,ENGLAND. NR 5 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 17 EP 20 DI 10.1016/S0022-3093(05)80046-8 PN 1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700004 ER PT J AU MAHAN, AH CHEN, Y WILLIAMSON, DL MOONEY, GD AF MAHAN, AH CHEN, Y WILLIAMSON, DL MOONEY, GD TI THE STRUCTURE OF A-SI-H BY SMALL-ANGLE X-RAY-SCATTERING SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY ID HYDROGENATED AMORPHOUS-SILICON; MICROSTRUCTURE; MICROVOIDS; ALLOYS AB We use small angle x-ray scattering (SAXS) and density measurements by flotation to examine the microstructure of a-Si:H deposited by various techniques. The systems studied include rf glow discharge (GD) films deposited at different substrate temperatures and a-Si:H deposited using other techniques such as very high frequency GD (VHF GD), sputtering (SP) and hot wire assisted chemical vapor deposition (HW). We review the methodology used to analyze the SAXS data and present extensive data where the SAXS samples were tilted with respect to the x-ray beam axis to examine more closely the microvoid shapes. The present results suggest that the microvoid shapes may be deposition system dependent. C1 COLORADO SCH MINES,GOLDEN,CO 80401. RP MAHAN, AH (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. NR 21 TC 30 Z9 31 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 65 EP 70 DI 10.1016/S0022-3093(05)80058-4 PN 1 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700016 ER PT J AU WINER, K AF WINER, K TI DEFECT POOL MODEL OF DEFECT FORMATION IN A-SI-H SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY AB The bulk chemical processes responsible for defect formation in hydrogenated amorphous silicon (a-Si:H) are examined. Thermodynamic analyses of the corresponding chemical reactions account quantitatively for the observed defect density dependence on temperature and Fermi energy, and for the behavior of the defect density in a-Si:H under voltage bias, illumination with band-gap light, and during hydrogen depletion. RP WINER, K (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808 L-419,LIVERMORE,CA 94550, USA. NR 10 TC 9 Z9 9 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 157 EP 162 DI 10.1016/S0022-3093(05)80080-8 PN 1 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700038 ER PT J AU VANECEK, M NELSON, BP MAHAN, AH CRANDALL, RS AF VANECEK, M NELSON, BP MAHAN, AH CRANDALL, RS TI ON EQUILIBRATION PROCESSES IN GD AMORPHOUS-SILICON, PREPARED AT HIGH SUBSTRATE TEMPERATURES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY ID ALPHA-SI-H; GLOW-DISCHARGE; DEFECTS AB Amorphous silicon with a low deep defect density and a sharp Urbach slope E(o) has been grown in the whole 200-550-degrees-C range. Under "optimal growth conditions", even at substrate temperatures around 500-degrees-C, E(o) can be as low as E(0) = kT(eq), where T(eq) is an equilibration temperature (almost-equal-to 200-degrees-C). Higher growth temperatures (T > 340-degrees-C) are suggested for improvement of light stability of amorphous silicon. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP VANECEK, M (reprint author), CZECHOSLOVAK ACAD SCI,INST PHYS,CUKROVARNICKA 10,CS-16200 PRAGUE 6,CZECHOSLOVAKIA. RI Vanecek, Milan/H-1995-2014 NR 17 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 191 EP 194 DI 10.1016/S0022-3093(05)80088-2 PN 1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700046 ER PT J AU KANICKI, J WARREN, WL SEAGER, CH CROWDER, MS LENAHAN, PM AF KANICKI, J WARREN, WL SEAGER, CH CROWDER, MS LENAHAN, PM TI MICROSCOPIC ORIGIN OF THE LIGHT-INDUCED DEFECTS IN HYDROGENATED NITROGEN-RICH AMORPHOUS-SILICON NITRIDE FILMS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY ID PARAMAGNETIC DEFECTS; CORRELATION-ENERGY AB The electron photo-excitation from the K- state and its subsequent trapping by K+ state is probably at the origin of the silicon dangling bonds (K0) formation during broad-band UV illumination of the N-rich amorphous silicon nitride films. Because the photo-excited electron will move towards the metal electrode the positive charge is expected to accumulate near the nitride-silicon interface with illumination time. Our data also suggest that the N-H group may be at the origin of the nitrogen dangling bonds creation in N-rich films. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. IBM CORP,DIV STORAGE SYST PROD,SAN JOSE,CA 95193. PENN STATE UNIV,UNIV PK,PA 16802. RP KANICKI, J (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598, USA. RI Kanicki, Jerzy/E-2753-2016 OI Kanicki, Jerzy/0000-0002-3649-8360 NR 17 TC 41 Z9 42 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 291 EP 294 DI 10.1016/S0022-3093(05)80113-9 PN 1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700071 ER PT J AU CRANDALL, RS SALAMON, SJ XU, YQ AF CRANDALL, RS SALAMON, SJ XU, YQ TI DENSITY OF STATES SPECTROSCOPY IN P-TYPE A-SI-H AND A-SIC-H SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY AB Using a closed torm expression for differential junction capacitance applicable when the density of states (DOS) varies exponentially with energy, we analyze p/n junction capacitance measurements that probe the DOS in boron doped hydrogenated amorphous silicon and silicon carbide alloy. In both materials the p-layer DOS increases exponentially with energy above the Fermi level. RP CRANDALL, RS (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 9 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 311 EP 314 DI 10.1016/S0022-3093(05)80118-8 PN 1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700076 ER PT J AU WYRSCH, N FINGER, F MCMAHON, TJ VANECEK, M AF WYRSCH, N FINGER, F MCMAHON, TJ VANECEK, M TI HOW TO REACH MORE PRECISE INTERPRETATION OF SUBGAP ABSORPTION-SPECTRA IN TERMS OF DEEP DEFECT DENSITY IN A-SI-H SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY ID GAP STATES; SILICON; CPM AB Values for the deep defect density determined from PDS, CPM or ESR may vary significantly on the same sample depending on the method of data analysis used. Experimental conditions under which they yield comparable results are discussed. Procedures for determination of deep defect density from optical spectra are reviewed and compared on samples in light-saturated states. The measurement of the absorption coefficient at E = 1.2 eV, with a new range for the calibration factor, is suggested as an easy and generally usable procedure for the determination of deep defect density. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. CZECHOSLOVAK ACAD SCI,INST PHYS,CS-16200 PRAGUE 6,CZECHOSLOVAKIA. RP WYRSCH, N (reprint author), UNIV NEUCHATEL,IMT,RUE BREGUET 2,CH-2000 NEUCHATEL,SWITZERLAND. RI Vanecek, Milan/H-1995-2014; Wyrsch, Nicoals/N-5005-2014 NR 19 TC 117 Z9 117 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 347 EP 350 DI 10.1016/S0022-3093(05)80127-9 PN 1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX227 UT WOS:A1991GX22700085 ER PT J AU MAHAN, AH NELSON, BP SALAMON, S CRANDALL, RS AF MAHAN, AH NELSON, BP SALAMON, S CRANDALL, RS TI DEPOSITION OF DEVICE QUALITY, LOW H CONTENT A-SI-H BY THE HOT-WIRE TECHNIQUE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY ID HYDROGENATED AMORPHOUS-SILICON; FILMS AB We report measurements of the Urbach edge and density of gap states on a series of hydrogenated amorphous silicon (a-Si:H) films deposited by hot-wire-assisted chemical vapor deposition (HW). We compare the properties of these films to those of a series of a-Si:H films deposited by the traditional radio frequency (rf) glow discharge (GD) technique, where we varied the substrate temperature to change the bonded H content (C(H)). We show for the first time that, as C(H) is decreased below the value traditionally associated with device quality GD a-Si:H (approximately 10 at.%), the electronic properties of the GD films deteriorate in the traditional manner while those for the HW samples remain device quality. Properties of these low C(H) HW samples will be presented and compared to those of GD films containing comparable C(H). Because several indications exist that the structure of the HW films is different than that of the GD films, Raman and Small Angle X-Ray Scattering (SAXS) measurements are presented to illustrate structural differences. RP MAHAN, AH (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. NR 14 TC 42 Z9 42 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 657 EP 660 DI 10.1016/S0022-3093(05)80206-6 PN 2 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX228 UT WOS:A1991GX22800005 ER PT J AU FAUCHET, PM CAMPBELL, IH AF FAUCHET, PM CAMPBELL, IH TI CRYSTALLIZATION OF A-SI-H WITH CW AND PULSED LASERS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY AB Results of crystallization of a-Si:H with a cw argon-ion laser (h-omega = 2.41 eV) and a pulsed Nd: YAG laser (h-omega = 1.17 eV, 100-ps pulses, 10(3) to 10(4) pulses) are presented. The properties of the films suggest that the mechanisms are different and in particular that pulsed crystallization is a nonthermal process. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP FAUCHET, PM (reprint author), UNIV ROCHESTER,LASER ENERGET LAB,250 E RIVER RD,ROCHESTER,NY 14623, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 729 EP 732 DI 10.1016/S0022-3093(05)80224-8 PN 2 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX228 UT WOS:A1991GX22800023 ER PT J AU PEREZMENDEZ, V CHO, G DREWERY, J JING, T KAPLAN, SN QURESHI, S WILDERMUTH, D FUJIEDA, I STREET, RA AF PEREZMENDEZ, V CHO, G DREWERY, J JING, T KAPLAN, SN QURESHI, S WILDERMUTH, D FUJIEDA, I STREET, RA TI AMORPHOUS-SILICON BASED RADIATION DETECTORS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON AMORPHOUS SEMICONDUCTORS - SCIENCE AND TECHNOLOGY ( ICAS-14 ) CY AUG 19-23, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY AB We describe the characteristics of thin(1-mu-m) and thick (> 30-mu-m) hydrogenated amorphous silicon p-i-n diodes which are optimized for detecting and recording the spatial distribution of charged particles, x-rays and gamma-rays. For x-ray, gamma-ray, and charged particle detection we can use thin p-i-n photosensitive diode arrays coupled to evaporated layers of suitable scintillators. For direct detection of charged particles with high resistance to radiation damage, we use the thick p-i-n diode arrays. C1 XEROX CORP,PALO ALTO RES CTR,PALO ALTO,CA 94304. RP PEREZMENDEZ, V (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Cho, Gyuseong/C-1527-2011 NR 13 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 137 BP 1291 EP 1296 DI 10.1016/S0022-3093(05)80360-6 PN 2 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX228 UT WOS:A1991GX22800159 ER PT J AU WARREN, WL LENAHAN, PM BRINKER, CJ AF WARREN, WL LENAHAN, PM BRINKER, CJ TI EXPERIMENTAL-EVIDENCE FOR 2 FUNDAMENTALLY DIFFERENT E' PRECURSORS IN AMORPHOUS-SILICON DIOXIDE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID ELECTRON-SPIN-RESONANCE; INDUCED PARAMAGNETIC DEFECTS; SI-29 HYPERFINE-STRUCTURE; SOL-GEL TRANSITION; OXYGEN HOLE CENTER; VITREOUS-SILICA; HIGH-PURITY; RADIATION-SENSITIVITY; IONIZING-RADIATION; CRYSTALLINE SIO2 AB E' centers (trivalent silicons) in two silicate systems, thermally grown SiO2 films on silicon and high surface area bulk sol-gel silicates, have been investigated. In the thermally grown silicon dioxide films, earlier work is extended by demonstrating that the hole trapping process is reversible; no complex structural rearrangement occurs at the hole trapping site (E' centers) after subsequent electron capture. This provides further evidence that these thermal oxide E' centers are oxygen vacancies as originally proposed by Feigl, Fowler and Yip. Also investigated is the radiation-induced generation of paramagnetic centers in high surface area sol-gel silicates containing various concentrations of the Raman active 608 cm-1 D2 band attributed to strained cyclic trisiloxanes (three-membered rings). The results suggest a correlation between the concentration of the strained three-membered rings and the concentration of radiation-induced E' and paramagnetic oxygen centers, thus providing the first substantive evidence of the relationship between a specific strained siloxane structure and radiation damage in amorphous silicon dioxide. These results suggest the existence for (1) two different fundamental E' precursors and (2) a relationship between atomic level stress and the radiation damage process in amorphous silicon dioxide. C1 PENN STATE UNIV,UNIV PK,PA 16802. SANDIA NATL LABS,DIV INORGAN MAT CHEM,ALBUQUERQUE,NM 87185. RP WARREN, WL (reprint author), SANDIA NATL LABS,DIV CERAM,ALBUQUERQUE,NM 87185, USA. NR 74 TC 35 Z9 35 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1991 VL 136 IS 1-2 BP 151 EP 162 DI 10.1016/0022-3093(91)90130-X PG 12 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX004 UT WOS:A1991GX00400018 ER PT J AU BRUEMMER, SM MERZ, MD CHARLOT, LA AF BRUEMMER, SM MERZ, MD CHARLOT, LA TI A METHOD FOR EVALUATING RADIATION-INDUCED GRAIN-BOUNDARY SEGREGATION USING ION-IRRADIATED MICROCRYSTALLINE STAINLESS ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID PHOSPHORUS SEGREGATION; DEPOSITION AB A new method to evaluate radiation-induced segregation (RIS) at internal interfaces is described. In this method bulk damage is produced in microcrystalline stainless alloys by ion irradiation, and grain boundary composition changes are measured using analytical electron microscopy. Material composition is controlled and modified by high-rate sputter-deposition synthesis of stainless alloys from composite targets. Nickel-rich 304 and 316 stainless steels doped with phosphorus and silicon were deposited and a microcrystalline grain size established by subsequent heat treatment. Irradiation damage was produced, and irradiation parameters varied, using nickel-ion bombardment from a tandem accelerator. Microstructural and microchemical changes during irradiation were documented by transmission electron microscopy (TEM) examination of near surface regions and by high-resolution composition measurements across grain boundary regions with a scanning TEM. The combination of high-rate sputtering to deposit microcrystalline alloys of controlled composition and heavy-ion irradiation enabled parametric studies of RIS to be performed in a timely and inexpensive manner. RP BRUEMMER, SM (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 22 TC 20 Z9 20 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1991 VL 186 IS 1 BP 13 EP 19 DI 10.1016/0022-3115(91)90346-9 PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA GU906 UT WOS:A1991GU90600003 ER PT J AU CANNON, NS GELLES, DS AF CANNON, NS GELLES, DS TI CHARPY IMPACT TEST-RESULTS FROM LOW ACTIVATION ALLOYS IRRADIATED TO 10 DPA AT 365-DEGREES-C SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB The effect of irradiation on Charpy impact properties has been determined for six low activation ferritic alloys irradiated in FFTF/MOTA to 3 x 10(22) n/cm2 (E > 0.1 MeV) or 10 dpa at 365-degrees-C. Compositions Fe-2Cr-1.5V, Fe-12Cr-6Mn-1V and Fe-12Cr-6Mn-1W develop unacceptably large shifts in ductile to brittle transition temperature (DBTT) due to irradiation, Fe-9Cr-1V develops a small shift and Fe-9Cr-1W and Fe-7.5Cr-2W develop negligible shifts. There is little effect on upper shelf energy (USE) in all cases. Fractographic examinations revealed a change in fracture mode from transgranular cleavage to intergranular failure at prior austenitic boundaries due to irradiation for four of the six alloys. The cause is ascribed to Mn additions in the alloys. Alloy development of low activation ferritic alloys should concentrate on the Fe-7.5 to 9Cr range. C1 PACIFIC NW LAB, DEPT MAT SCI, RICHLAND, WA 99352 USA. RP CANNON, NS (reprint author), WESTINGHOUSE HANFORD CO, MAT ENGN, RICHLAND, WA 99352 USA. NR 10 TC 8 Z9 8 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1991 VL 186 IS 1 BP 68 EP 76 DI 10.1016/0022-3115(91)90354-A PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA GU906 UT WOS:A1991GU90600011 ER PT J AU GELLES, DS OHNUKI, S LOOMIS, BA TAKAHASHI, H GARNER, FA AF GELLES, DS OHNUKI, S LOOMIS, BA TAKAHASHI, H GARNER, FA TI A MICROSTRUCTURAL EXPLANATION FOR IRRADIATION EMBRITTLEMENT OF V-15CR-5TI SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB In order to explain severe degradation of mechanical properties, specimens of V-15Cr-5Ti have been examined by transmission electron microscopy following irradiation at 600-degrees-C to 14 dpa in FFTF. Specimens irradiated at 420 and 520-degrees-C were also examined to confirm density change measurements that indicated swelling levels as high as 2.5%. Following irradiation at 600-degrees-C, a complex microstructure was found that included a perfect dislocation network of line segments and loops, faulted loops, a high density of black spot damage and a high density of rod-shaped precipitates. Heat-to-heat variations did not appear to significantly alter these microstructural features; instead the density of large blocky precipitates, believed to be TiO2, was found to have increased with increasing oxygen content. Only two of the specimens irradiated at 600-degrees-C contained voids, whereas none of the specimens irradiated at 420 or 520-degrees-C contained voids. Therefore, swelling as measured by density change is probably due to phase instability in these specimen conditions, and the hardening and irradiation embrittlement that has been observed can be explained by the microstructural development. Phase stability appears to be an important criterion in the design of vanadium alloys for fusion applications. C1 ARGONNE NATL LAB, FUS POWER PROGRAM, ARGONNE, IL 60439 USA. HOKKAIDO UNIV, FAC ENGN, MET RES INST, SAPPORO, HOKKAIDO 060, JAPAN. RP GELLES, DS (reprint author), PACIFIC NW LAB, DEPT MAT SCI, POB 999, RICHLAND, WA 99352 USA. NR 14 TC 6 Z9 6 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1991 VL 186 IS 1 BP 77 EP 82 DI 10.1016/0022-3115(91)90355-B PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA GU906 UT WOS:A1991GU90600012 ER PT J AU SHELDON, RI MULFORD, RNR AF SHELDON, RI MULFORD, RNR TI CORRECTION TO THE URANIUM EQUATION OF STATE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter ID LIQUID RP SHELDON, RI (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 4 TC 6 Z9 6 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1991 VL 185 IS 3 BP 297 EP 298 DI 10.1016/0022-3115(91)90517-B PG 2 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA GT698 UT WOS:A1991GT69800008 ER PT J AU BRASHEAR, JP BIGLARBIGI, K BECKER, AB RAY, RM AF BRASHEAR, JP BIGLARBIGI, K BECKER, AB RAY, RM TI EFFECT OF WELL ABANDONMENTS ON EOR POTENTIAL SO JOURNAL OF PETROLEUM TECHNOLOGY LA English DT Article AB EOR holds significant potential for producing additional oil from known reservoirs in the U.S. However, the economical application of the tertiary processes required to produce this oil relies on the use of existing wells as points of reservoir access. Abandonment of these wells could substantially reduce the future recovery potential of the huge known remaining oil resource. This paper summarizes the effect of well abandonments on recovery potential by various EOR methods for more than 1,400 major fields that account for 67% of total known original oil in place (OOIP) in the U.S. The study concludes that replacing existing wells (after their abandonment) would significantly increase costs and reduce U.S. EOR reserves. C1 US DOE,BARTLESVILLE PROJECT OFF,WASHINGTON,DC 20545. RP BRASHEAR, JP (reprint author), ICF RESOURCES INC,FAIRFAX,VA, USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU SOC PETROLEUM ENG PI RICHARDSON PA 222 PALISADES CREEK DR, RICHARDSON, TX 75080 SN 0149-2136 J9 J PETROL TECHNOL JI J. Pet. Technol. PD DEC PY 1991 VL 43 IS 12 BP 1496 EP 1501 PG 6 WC Energy & Fuels; Engineering, Chemical; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA GV016 UT WOS:A1991GV01600016 ER PT J AU GROSS, EM WOLK, CP JUTTNER, F AF GROSS, EM WOLK, CP JUTTNER, F TI FISCHERELLIN, A NEW ALLELOCHEMICAL FROM THE FRESH-WATER CYANOBACTERIUM FISCHERELLA-MUSCICOLA SO JOURNAL OF PHYCOLOGY LA English DT Article DE ALGAECIDE; ALLELOCHEMICAL; ALLELOPATHY; CYANOBACTERIA; FISCHERELLA-MUSCICOLA; PHOTOSYSTEM-II INHIBITOR; SECONDARY METABOLITE ID BLUE-GREEN-ALGA; CYANOPHYTE HAPALOSIPHON-FONTINALIS; NATURAL ALGICIDE; HAPALINDOLES; ALKALOIDS AB The benthic cyanobacterium Fischerella muscicola (Thur.) Gom. UTEX 1829 produces a secondary metabolite, fischerellin, that strongly inhibits other cyanobacteria and to a lesser extent members of the Chlorophyceae. Eubacteria are not affected. The major active compound is lipophilic and exhibits a molecular ion at m/z 408. It is heat- and acid-stable but decomposes in 1 M sodium hydroxide (80-degrees-C, 1 h). Fischerellin inhibits the photosynthetic but not the respiratory electron transport of cyanobacteria and chlorophytes. Its site of action is located in PS II. Two other species of Fischerella also produce fischerellin, indicating that the synthesis of such allelochemicals might be characteristic of the genus. C1 MICHIGAN STATE UNIV,US DOE,CTR MICROBIAL ECOL,E LANSING,MI 48824. MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. RP GROSS, EM (reprint author), MAX PLANCK INST LIMNOL,OKOPHYSIOL ABT,W-2320 PLON,GERMANY. OI Gross, Elisabeth Maria/0000-0002-9392-8582 NR 33 TC 82 Z9 87 U1 2 U2 9 PU PHYCOLOGICAL SOC AMER INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044 SN 0022-3646 J9 J PHYCOL JI J. Phycol. PD DEC PY 1991 VL 27 IS 6 BP 686 EP 692 DI 10.1111/j.0022-3646.1991.00686.x PG 7 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA GY881 UT WOS:A1991GY88100005 ER PT J AU NILSEN, J AF NILSEN, J TI AN NE-LIKE FE LASER RESONANTLY PHOTOPUMPED BY NEXLY-ALPHA RADIATION SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID X-RAY-LASER; POPULATION-INVERSION; IMPLOSION-DRIVEN; BEAM-FOIL; PHOTOEXCITATION; PLASMAS; GAIN; IONS; LINE; IX AB We propose using the Ne X Ly-alpha emission line generated by a neon Z-pinch to photo-pump neon-like iron (Z = 26) resonantly and produce lasing on several 3p --> 3s transitions ranging from 200 to 400 angstrom. By modeling the Ne Z-pinch output obtained on SATURN experiments as an X-ray source, the time-dependent properties of the Fe lasant are studied. The effect on the gain of varying parameters such as the ion density of the Fe lasant and the output of the Z-pinch is investigated. Our model yields a maximum gain of 4 and 13 cm-1 on the dominant laser lines at 254 and 387 angstrom, respectively. However when the impact of radiation transfer on the gain of the various laser lines is considered in a one-dimensional cylindrical geometry, more realistic gains of 2-4 cm-1 are calculated on these lines. RP NILSEN, J (reprint author), LAWRENCE LIVERMORE NATL LAB,L-59,LIVERMORE,CA 94550, USA. NR 38 TC 8 Z9 8 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD DEC PY 1991 VL 46 IS 6 BP 547 EP 556 DI 10.1016/0022-4073(91)90033-M PG 10 WC Optics; Spectroscopy SC Optics; Spectroscopy GA GU762 UT WOS:A1991GU76200008 ER PT J AU ULLRICH, RL PRESTON, RJ AF ULLRICH, RL PRESTON, RJ TI RADIATION-INDUCED MAMMARY-CANCER SO JOURNAL OF RADIATION RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RADIATION CARCINOGENESIS IN THE WHOLE-BODY SYSTEM CY DEC 05-06, 1990 CL TOKYO, JAPAN SP JAPAN RADIAT RES SOC, FDN PROMOT CANC RES ID BALB/C MICE; INDUCTION; GENE C1 UNIV TEXAS,MED BRANCH,DEPT RADIAT THERAPY,GALVESTON,TX 77550. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 8 TC 4 Z9 4 U1 0 U2 1 PU JAPAN RADIATION RESEARCH SOC PI CHIBA PA C/O NAT INST RADIOLOGICAL SCI 9-1 ANAGAWA-4-CHOME INAGE-KU, CHIBA 263, JAPAN SN 0449-3060 J9 J RADIAT RES JI J. Radiat. Res. PD DEC PY 1991 VL 32 SU 2 BP 104 EP 109 DI 10.1269/jrr.32.SUPPLEMENT2_104 PG 6 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA JD399 UT WOS:A1991JD39900011 PM 1823347 ER PT J AU SEED, TM AF SEED, TM TI HEMATOPOIETIC-CELL CRISIS - AN EARLY STAGE OF EVOLVING MYELOID-LEUKEMIA FOLLOWING RADIATION EXPOSURE SO JOURNAL OF RADIATION RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RADIATION CARCINOGENESIS IN THE WHOLE-BODY SYSTEM CY DEC 05-06, 1990 CL TOKYO, JAPAN SP JAPAN RADIAT RES SOC, FDN PROMOT CANC RES DE CANINE LEUKEMIA MODEL; HEMATOPOIETIC PROGENITORS; CFU-GM; HEMATOPOIETIC CRISIS; MYELOID LEUKEMIA; PRELEUKEMIA; CHRONIC IRRADIATION ID MYELOPROLIFERATIVE DISEASE; GAMMA-IRRADIATION; APLASTIC-ANEMIA; RADIOSENSITIVITY; ULTRASTRUCTURE; PROGENITORS; PROGRESSION; RESPONSES; DOGS AB Under select radiological conditions, chronic radiation exposure elicits a high incidence of myeloproliferative disease, principally myeloid leukemia (ML), in beagles. Previously we demonstrated that for full ML expression, a four-stage preclinical sequence is required, namely (I) suppression, (II) recovery, (III) accommodation, and (IV) preleukemic transition. Within this pathological sequence, a critical early event has been identified as the acquisition of radioresistence by hematopoietic progenitors that serves to mediate a newfound regenerative hematopoietic capacity. As such, this event "sets the stage" for preleukemic progression by initiating progression from preclinical phase I to II. Due to the nature of target cell suppression, the induction of crisis, and the outgrowth of progenitors with altered phenotypes, this preleukemic event resembles the "immortalization" step of the in vitro transformation sequence following induction with either physical and chemical carcinogens. The radiological, temporal, and biological dictages governing this event have been extensively evaluated and will be discussed in light of their role in thc induction and progression of chronic radiation leukemia C1 ARGONNE NATL LAB,BIOL & MED RES DIV,RADIAT HEMATOL GRP,ARGONNE,IL 60439. NR 35 TC 3 Z9 4 U1 2 U2 3 PU JAPAN RADIATION RESEARCH SOC PI CHIBA PA C/O NAT INST RADIOLOGICAL SCI 9-1 ANAGAWA-4-CHOME INAGE-KU, CHIBA 263, JAPAN SN 0449-3060 J9 J RADIAT RES JI J. Radiat. Res. PD DEC PY 1991 VL 32 SU 2 BP 118 EP 131 DI 10.1269/jrr.32.SUPPLEMENT2_118 PG 14 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA JD399 UT WOS:A1991JD39900013 PM 1823349 ER PT J AU FRY, RJM AF FRY, RJM TI RADIATION CARCINOGENESIS IN THE WHOLE-BODY SYSTEM SO JOURNAL OF RADIATION RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RADIATION CARCINOGENESIS IN THE WHOLE-BODY SYSTEM CY DEC 05-06, 1990 CL TOKYO, JAPAN SP JAPAN RADIAT RES SOC, FDN PROMOT CANC RES C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JAPAN RADIATION RESEARCH SOC PI CHIBA PA C/O NAT INST RADIOLOGICAL SCI 9-1 ANAGAWA-4-CHOME INAGE-KU, CHIBA 263, JAPAN SN 0449-3060 J9 J RADIAT RES JI J. Radiat. Res. PD DEC PY 1991 VL 32 SU 2 BP 288 EP 296 PG 9 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA JD399 UT WOS:A1991JD39900028 ER PT J AU YOKORO, K FRY, RJM KONDO, S TANOOKA, H SADO, T AF YOKORO, K FRY, RJM KONDO, S TANOOKA, H SADO, T TI RADIATION CARCINOGENESIS IN THE WHOLE-BODY SYSTEM - DECEMBER 5-6, 1990 TOKYO - PREFACE SO JOURNAL OF RADIATION RESEARCH LA English DT Editorial Material C1 HIROSHIMA UNIV,NUCL MED & BIOL RES INST,HIROSHIMA 730,JAPAN. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. KINKI UNIV,ATOM ENERGY RES INST,HIGASHIOSAKA,OSAKA 577,JAPAN. NATL CANC CTR,CHUO KU,TOKYO 104,JAPAN. NATL INST RADIOL SCI,DIV PHYSIOL & PATHOL,CHIBA 260,JAPAN. NR 0 TC 0 Z9 0 U1 0 U2 1 PU JAPAN RADIATION RESEARCH SOC PI CHIBA PA C/O NAT INST RADIOLOGICAL SCI 9-1 ANAGAWA-4-CHOME INAGE-KU, CHIBA 263, JAPAN SN 0449-3060 J9 J RADIAT RES JI J. Radiat. Res. PD DEC PY 1991 VL 32 SU 2 BP U1 EP U1 PG 1 WC Biology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Radiology, Nuclear Medicine & Medical Imaging GA JD399 UT WOS:A1991JD39900001 ER PT J AU RARD, JA MILLER, DG AF RARD, JA MILLER, DG TI CORRECTED VALUES OF OSMOTIC AND ACTIVITY-COEFFICIENTS OF AQUEOUS NATCO4 AND HTCO4 AT 25-DEGREES-C SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE OSMOTIC COEFFICIENTS; ACTIVITY COEFFICIENTS; AQUEOUS SOLUTIONS; SODIUM PERTECHNETATE; PERTECHNETIC ACID AB Published isopiestic molalities for aqueous NaTcO4 and HTcO4 solutions at 25-degrees-C have been reexamined. Our calculations indicate that published smoothed values of the osmotic coefficients phi and mean molal activity coefficients gamma +/- of NaTcO4 are substantially in error, by up to 100% for phi and 300% for gamma +/-. Published smoothed values of phi and gamma +/- for HTcO4 solutions are in somewhat better agreement with the input data, but the reported phi are sometimes higher and sometimes lower than experimental values, by up to 6%. Consequently, we have reanalyzed isopiestic data for these two systems, and find that errors arose in representing the data mathematically. We report parameters for an extended form of the specific ion interaction equations and for Pitzer's equations, and corrected values of phi and gamma +/- are tabulated for aqueous NaTcO4 and HTcO4. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT MAT SCI,LIVERMORE,CA 94550. RP RARD, JA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550, USA. NR 13 TC 4 Z9 4 U1 1 U2 5 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD DEC PY 1991 VL 20 IS 12 BP 1139 EP 1147 DI 10.1007/BF01075131 PG 9 WC Chemistry, Physical SC Chemistry GA GW071 UT WOS:A1991GW07100001 ER PT J AU RAI, D FELMY, AR MOORE, DA AF RAI, D FELMY, AR MOORE, DA TI THERMODYNAMIC MODEL FOR AQUEOUS CD-2+-CO32- IONIC INTERACTIONS IN HIGH-IONIC-STRENGTH CARBONATE SOLUTIONS, AND THE SOLUBILITY PRODUCT OF CRYSTALLINE CDCO3 SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE SOLUBILITY; EQUILIBRIUM CONSTANTS; ACTIVITY COEFFICIENT; CDCO3(C); CADMIUM; CARBONATO COMPLEXES; ION INTERACTION ID ELECTROLYTES; 25-DEGREES-C; CALCITE; CADMIUM; SYSTEM AB The aqueous solubility of CdCO3(c) was studied in 0.01M NaClO4, in solutions equilibrated with N2-CO2(g) mixtures that contained 0.0003, 0.001, or 0.138 atmospheres of CO2(g). The pH ranged from about 4.5 to 9, and the studies were conducted from both the oversaturation and the undersaturation directions, with the equilibration periods ranging from 6 to 57 d. To determine the carbonato complexes of Cd(II), the solubility of CdCO3(c) was also studied in 0.0016 to 1.00M Na2CO3 solutions at fixed hydroxide ion concentration, and in solutions with fixed aqueous C concentrations (0.1 and 0.01M C) over a range of OH- from 1 x 10(-5) to 1.0M. The equilibrium Cd concentrations were reached in less than about 6 d. Pitzer's ion-interaction model was used to interpret these solubility data, as well as CdCO3(c) solubility data reported in the literature, which extended to 5.0M K2CO3 with an ionic strength of approximately 18.6 m. Our thermodynamic model required the introduction of two aqueous Cd2+-CO3(2-) complexes, CdCO3(aq) and Cd(CO3)2(2-), as well as ion-interaction parameters for Cd(CO3)2(2-) with the bulk cations Na+ and K+. This model gave excellent agreement with all available experimental data extending to 5.0M K2CO3. The logarithms of the thermodynamic equilibrium constants for the reactions: CdCO3(c) reversible Cd2+ + CO3(2-) Cd2+ + CO3(2-) reversible CdCO3(aq) Cd2+ + 2CO3(2-) reversible Cd(CO3)2(2-) were found to be -12.2(4) +/- 0.1, 4.7(1) +/- 0.1, and 6.4(9) +/- 0.1, respectively. The beta-0 ion-interaction parameters for Cd(CO3)2(2-)-Na+ and Cd(CO3)2(2-)-K+ were found to be -0.14 and -0.06, respectively. RP RAI, D (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 18 TC 19 Z9 19 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD DEC PY 1991 VL 20 IS 12 BP 1169 EP 1187 DI 10.1007/BF01075134 PG 19 WC Chemistry, Physical SC Chemistry GA GW071 UT WOS:A1991GW07100004 ER PT J AU RICHARDS, PM SZABO, A AF RICHARDS, PM SZABO, A TI REVERSIBLE TRAPPING ON A CUBIC LATTICE - COMPARISON OF THEORY AND SIMULATIONS SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article; Proceedings Paper CT CONF ON MODELS OF NON-CLASSICAL REACTION RATES CY MAR 25-27, 1991 CL NIH, BETHESDA, MD HO NIH DE REVERSIBLE REACTIONS; SATURABLE TRAPS; BIMOLECULAR; DIFFUSION; SUPERPOSITION APPROXIMATION; CUBIC LATTICE ID DIFFUSION; TRAPS AB Simulations of the kinetics of the reversible diffusion-influenced reaction A + B reversible AB on a cubic lattice, with initial conditions [A] = [B], [AB] = 0, are compared with the predictions of two approximate theoretical formalisms. The first involves a simple rate equation with rate coefficients that are proportional to the time-dependent rate coefficient for an irreversible reaction. The second, which is based on a superposition approximation, contains a rate coefficient that explicitly depends on the bulk concentrations. Both reduce to the Smoluchowski approach in the irreversible limit. The results obtained using the modified rate equation formalism are exact at short times, but tend to approach equilibrium too rapidly. The predictions of the computationally more demanding superposition formalism agree remarkably well with the simulations for all times for the range of parameters examined. C1 NIDDKD,CHEM PHYS LAB,BETHESDA,MD 20892. RP RICHARDS, PM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Szabo, Attila/H-3867-2012 NR 19 TC 24 Z9 24 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD DEC PY 1991 VL 65 IS 5-6 BP 1085 EP 1093 DI 10.1007/BF01049599 PG 9 WC Physics, Mathematical SC Physics GA GY071 UT WOS:A1991GY07100017 ER PT J AU GARRITY, PJ AF GARRITY, PJ TI THE DEPRECIATION OF NUCLEAR-WEAPONS IN INTERNATIONAL-POLITICS - POSSIBILITIES, LIMITS, UNCERTAINTIES SO JOURNAL OF STRATEGIC STUDIES LA English DT Article ID STRATEGY RP GARRITY, PJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NATL SECUR STUDIES,LOS ALAMOS,NM 87544, USA. NR 165 TC 4 Z9 4 U1 0 U2 0 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD DEC PY 1991 VL 14 IS 4 BP 463 EP 514 DI 10.1080/01402399108437465 PG 52 WC International Relations; Political Science SC International Relations; Government & Law GA HG591 UT WOS:A1991HG59100005 ER PT J AU KRESIN, VZ WOLF, SA DEUTSCHER, G AF KRESIN, VZ WOLF, SA DEUTSCHER, G TI CHARGE-EXCHANGE AND THE PLATEAU EFFECT IN YBA2CU3O7-Y SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE PLATEAU EFFECT; YBA2CU3O7-Y; THEORY AB The superconducting properties of YBa2Cu3O7-y (YBCO) depend strongly on the oxygen content, whereas the transition temperature T, remains relatively constant for oxygen content between 6.8 and 7.0 (the "Plateau" effect) this effect has attracted considerable attention [see, e.g., D. de Fontaine et al., Nature (London) 343, 544 (1990); H. Paulsen et al., Nature (London) 349, 594 (1991); J. Jorgensen, Phys. Today 44, No. 6, 34 (1991)]. In this letter we introduce a microscopic theory of this phenomenon. RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 0 TC 3 Z9 3 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD DEC PY 1991 VL 4 IS 6 BP 409 EP 410 DI 10.1007/BF00635856 PG 2 WC Physics, Applied; Physics, Condensed Matter SC Physics GA GY673 UT WOS:A1991GY67300002 ER PT J AU SHELDON, BW BESMANN, TM AF SHELDON, BW BESMANN, TM TI REACTION AND DIFFUSION KINETICS DURING THE INITIAL-STAGES OF ISOTHERMAL CHEMICAL VAPOR INFILTRATION SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE COMPOSITES; INFILTRATION; KINETICS; DIFFUSION; CHEMICAL VAPOR DEPOSITION ID GAS-SOLID REACTIONS; CERAMIC COMPOSITES; FABRICATION; MODEL AB Individual bundles of ceramic fibers were infiltrated with SiC to study the reaction and diffusion kinetics during isothermal chemical vapor infiltration (CVI). More uniform infiltration was observed in samples where baffles were placed in the reactor and when HCl was added to the inlet gases. The evolution of the microstructure was modeled using an analytical expression for impinging cylindrical fibers. The transport of reactants was treated using classical descriptions of molecular and Knudsen diffusion in a porous body and also by considering the existence of a percolation threshold. All of these models predict that infiltration should be more uniform than the results that were obtained experimentally. It is possible that this discrepancy occurs because mass transport is more complex than the descriptions that were used. However, a more likely explanation is that the deposition kinetics are significantly more complex than the simple first-order reaction that was used for these models. RP SHELDON, BW (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 26 TC 33 Z9 33 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD DEC PY 1991 VL 74 IS 12 BP 3046 EP 3053 DI 10.1111/j.1151-2916.1991.tb04300.x PG 8 WC Materials Science, Ceramics SC Materials Science GA GW441 UT WOS:A1991GW44100012 ER PT J AU BLEIER, A WESTMORELAND, CG AF BLEIER, A WESTMORELAND, CG TI EFFECTS OF PH AND PARTICLE-SIZE ON THE PROCESSING OF AND THE DEVELOPMENT OF MICROSTRUCTURE IN ALUMINA-ZIRCONIA COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE COLLOIDS; PROCESSING; ALUMINA; ZIRCONIA; SEDIMENTATION ID POLYVINYL-CHLORIDE LATEX; LUDOX HS SILICA; HETEROCOAGULATION; HYDROXIDE AB The aqueous processing of binary suspensions that contain 0.50-mu-m alumina and either 0.20- or 0.71-mu-m zirconia was studied from pH 3 to 11, emphasizing colloidally stable systems. Differences in particle size and density can induce differential sedimentation and lead to a nonuniform oxide distribution in pellets prepared by pressure filtration. Uniformity improves when the zeta potentials of the unlike particles are of the same sign but differ greatly in magnitude, i.e., in the pH range 5 to 6, where the oxides experience a weak, mutual association. However, when they are more similar electrostatically, they do not mutually associate and uniformity suffers. This nonuniformity occurs with the adjustment of pH to << 5 (pos ive particles) and the adsorption of soluble species that strongly alter the zeta potential, e.g., after the preexposure of zirconia to aluminum chloride (positive particles) and the addition of polyacrylic acid (negative particles). In these cases, either high viscosity or rapid consolidation are required to ensure a uniform distribution. The disparity in the particle number fraction, derived from the size differences, and the thermodynamic interparticle energies control the prefired microstructure and are central to the prediction of the proper processing conditions. RP BLEIER, A (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. NR 66 TC 54 Z9 55 U1 1 U2 6 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0002-7820 EI 1551-2916 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD DEC PY 1991 VL 74 IS 12 BP 3100 EP 3111 DI 10.1111/j.1151-2916.1991.tb04307.x PG 12 WC Materials Science, Ceramics SC Materials Science GA GW441 UT WOS:A1991GW44100019 ER PT J AU CURRIN, C MITCHELL, T MORRIS, M YLVISAKER, D AF CURRIN, C MITCHELL, T MORRIS, M YLVISAKER, D TI BAYESIAN PREDICTION OF DETERMINISTIC FUNCTIONS, WITH APPLICATIONS TO THE DESIGN AND ANALYSIS OF COMPUTER EXPERIMENTS SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Article DE COMPUTER MODELS; CORRELATION FUNCTION; CROSS-VALIDATION; ENTROPY; EXPERIMENTAL DESIGN; INTERPOLATION; KRIGING; OPTIMAL DESIGN; SPLINE FITTING; STOCHASTIC PROCESSES ID LIKELIHOOD ESTIMATION; STOCHASTIC PROCESSES; LINEAR-MODEL; REGRESSION; COVARIANCE AB This article is concerned with prediction of a function y(t) over a (multidimensional) domain T, given the function values at a set of "sites" {t(1), t(2),...,t(n)} in T, and with the design, that is, with the selection of those sites. The motivating application is the design and analysis of computer experiments, where t determines the input to a computer model of a physical or behavioral system, and y(t) is a response that is part of the output or is calculated from it. Following a Bayesian formulation, prior uncertainty about the function y is expressed by means of a random function Y, which is taken here to be a Gaussian stochastic process. The mean of the posterior process can be used as the prediction function y triple-over-dot (t), and the variance can be used as a measure of uncertainty. This kind of approach has been used previously in Bayesian interpolation and is strongly related to the kriging methods used in geostatistics. Here emphasis is placed on product linear and product cubic correlation functions, which yield prediction functions that are, respectively, linear or cubic splines in every dimension. A posterior entropy criterion is adopted for design; this minimizes the expected uncertainty about the posterior process, as measured by the entropy. A computational algorithm for finding entropy-optimal designs on multidimensional grids is described. Several examples are presented, including a two-dimensional experiment on a computer model of a thermal energy storage device and a six-dimensional experiment on an integrated circuit simulator. Predictions are made using several different families of correlation functions, with parameters chosen to maximize the likelihood. For comparison, predictions are also made via least squares fitting of various polynomial and spline models. The Bayesian design/prediction methods, which do not require any modeling of y, produce comparatively good predictions. For some correlation functions, however, the 95% posterior probability intervals do not give adequate coverage of the true values of y at selected test sites. These methods are fairly simple and offer considerable potential for virtually automatic implementation, although further development is needed before they can be applied routinely in practice. C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,MATH SCI SECT,OAK RIDGE,TN 37831. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. BRYN MAWR COLL,BRYN MAWR,PA 19010. RP CURRIN, C (reprint author), OHIO STATE UNIV,DEPT PSYCHOL,COLUMBUS,OH 43210, USA. NR 49 TC 335 Z9 338 U1 5 U2 28 PU AMER STATIST ASSN PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD DEC PY 1991 VL 86 IS 416 BP 953 EP 963 DI 10.2307/2290511 PG 11 WC Statistics & Probability SC Mathematics GA GU050 UT WOS:A1991GU05000017 ER PT J AU JORDAN, KG TOBIAS, CW AF JORDAN, KG TOBIAS, CW TI A SIMULATION OF THE INFLUENCE OF CORROSIVE AGENTS IN ELECTRODEPOSITION ON MICROPROFILES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID BOUNDARY ELEMENT AB Using a numerical simulation, the effect of: corrosive agents consumed at the transport-limited rate on developing metal deposit profiles is characterized as a function of the relative rates of corrosion and electrodeposition; the relative importance of ohmic and kinetic resistances in determining the current distribution; and the geometry of the system. Corrosive agents are shown to blunt sharp features even for current efficiencies as high as 99%. Significant leveling is demonstrated if the current distribution is dominated by charge transfer kinetics and the rate of corrosion is on the order of the rate of electrodeposition. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD DEC PY 1991 VL 138 IS 12 BP 3581 EP 3588 DI 10.1149/1.2085462 PG 8 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA GT518 UT WOS:A1991GT51800017 ER PT J AU WATSON, SW WALTERS, RP AF WATSON, SW WALTERS, RP TI THE EFFECT OF CHROMIUM PARTICLES ON NICKEL ELECTRODEPOSITION SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB In order to obtain an understanding of the mechanism of chromium particle occlusion in electrodeposited stainless-steel-type coatings, the U.S. Bureau of Mines has studied the effect of chromium particles on nickel electrodeposition. The chromium particles catalyzed nickel electrodeposition on a vitreous carbon surface. Chromium particle additions, when added to Watt's-type electrolytes, of 0.33M, 0.67M, and 1.00M NiSO4, shifted the nickel reduction wave to more positive potentials on a vitreous carbon surface. From rotating cylinder electrode studies it was concluded that nickel deposition with or without chromium particles is a kinetically limited rather than mass-transfer-limited process. Electrochemical impedance spectroscopy experiments with and without chromium particles verified the rate-determining step proposed by Epelboin, with the Ni+(ads) limiting the nickel electrodeposition. The chromium particles appear to enhance the formation of this Ni+(ads) intermediate. RP WATSON, SW (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 14 TC 32 Z9 33 U1 0 U2 4 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD DEC PY 1991 VL 138 IS 12 BP 3633 EP 3637 DI 10.1149/1.2085471 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA GT518 UT WOS:A1991GT51800026 ER PT J AU CLEAR, R BERMAN, S AF CLEAR, R BERMAN, S TI THE EFFECT OF INSTRUCTIONS ON VISUAL AND TASK-PERFORMANCE SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article RP CLEAR, R (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD WIN PY 1991 VL 20 IS 1 BP 108 EP 116 PG 9 WC Optics SC Optics GA FN922 UT WOS:A1991FN92200014 ER PT J AU AHLUWALIA, RK IM, KH AF AHLUWALIA, RK IM, KH TI ASPECTS OF MASS-TRANSFER AND DISSOLUTION KINETICS OF HOT CORROSION INDUCED BY SODIUM-SULFATE SO JOURNAL OF THE INSTITUTE OF ENERGY LA English DT Article AB A mass-transfer model is developed which considers the diffusive and chemical aspects of sodium sulphate formation and deposition on cooled blades of coal-fired gas turbines. The roles of gas-phase condensation of sodium sulphate and multi-component diffusion across a chemically frozen thin boundary layer are elaborated. A rational procedure is presented for correlating material wastage with laboratory weight-gain data obtained by exposing alloy specimens pre-coated with a thin film of sodium sulphate to SO2-SO3 in an oxygen environment. The sodium sulphate mass-transfer model is used in conjunction with this correlation, to project blade corrosion and life as a function of gas-turbine inlet temperature, blade cooling and the concentrations of sodium and sulphur contaminants. RP AHLUWALIA, RK (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU INST ENERGY PI LONDON PA 18 DEVONSHIRE ST PORTLAND PLACE, LONDON, ENGLAND W1N 2AU SN 0144-2600 J9 J I ENERGY JI J. Inst. Energy PD DEC PY 1991 VL 64 IS 461 BP 186 EP 195 PG 10 WC Energy & Fuels SC Energy & Fuels GA HA224 UT WOS:A1991HA22400001 ER PT J AU BARKER, CE EIMERL, D VELSKO, SP AF BARKER, CE EIMERL, D VELSKO, SP TI TEMPERATURE-INSENSITIVE PHASE MATCHING FOR 2ND-HARMONIC GENERATION IN DEUTERATED L-ARGININE PHOSPHATE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID HARMONIC-GENERATION; NONLINEAR CRYSTAL; DEPENDENCE; LIIO3; 2ND AB We present measurements of the thermal behavior of the second-harmonic generation (SHG) phase-matching loci of deuterated l-arginine phosphate (dLAP) at a fundamental wavelength of 1.064-mu-m. These results clearly indicate the existence of temperature-insensitive phase-matching directions that possess large nonlinear couplings. To the best of our knowledge, this property of temperature-insensitive SHG phase-matching directions is unique to dLAP. Such behavior can greatly decrease thermal contributions to phase mismatch in high-average-power harmonic conversion. RP BARKER, CE (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,MS L-490 POB 808,LIVERMORE,CA 94550, USA. NR 29 TC 7 Z9 7 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD DEC PY 1991 VL 8 IS 12 BP 2481 EP 2492 DI 10.1364/JOSAB.8.002481 PG 12 WC Optics SC Optics GA GX214 UT WOS:A1991GX21400013 ER PT J AU RITCHIE, B AF RITCHIE, B TI SEMICLASSICAL THEORY OF STRONG-FIELD HARMONIC-GENERATION SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID MULTIPHOTON IONIZATION; RADIATION; DYNAMICS AB The Schrodinger equation is integrated in space and time for calculation of the photoionization dynamics and harmonic generation in a generic one-dimensional model in a strong monochromatic field. These results are compared with classical results for the ionization and with semiclassical results for the harmonic generation, and generally good agreement is obtained. The semiclassical method introduced here for calculation of the harmonic generation consists of approximating the Heisenberg dipole moment operator by a classical trajectory and then averaging over an ensemble of such trajectories by means of the initial wave function. This average represents a semiclassical approximation to the temporally oscillating, field-induced dipole moment, which is used to calculate the photoemission spectrum. RP RITCHIE, B (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD DEC PY 1991 VL 8 IS 12 BP 2493 EP 2496 DI 10.1364/JOSAB.8.002493 PG 4 WC Optics SC Optics GA GX214 UT WOS:A1991GX21400014 ER PT J AU MORII, Y NAGASAWA, A MATSUO, Y FUNAHASHI, S CHILD, HR NICKLOW, RM AF MORII, Y NAGASAWA, A MATSUO, Y FUNAHASHI, S CHILD, HR NICKLOW, RM TI LATTICE INSTABILITY IN BETA-1-AGZN SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article DE LATTICE INSTABILITY; AGZN; PRECURSOR PHENOMENA; MARTENSITIC PHASE; NEUTRON SCATTERING; PHONON DISPERSION; FORCE CONSTANT ANALYSIS ID MARTENSITIC PHASE-TRANSFORMATION; ELASTIC BEHAVIOR; X-RAY; ALLOYS; TRANSITION; AUCUZN2; AGZN AB Phase transition of beta(1)-AgZn alloy was studied by means of neutron inelastic and diffuse scattering techniques. Acoustic phonon dispersion relation along the main crystal axes of the alloy was obtained. No [zeta-zeta-zeta]LA phonon anomalies related to the zeta-phase was observed, although previous sound experiment followed by elastic constant analysis predicts that possibility. The observed anomalies in phonon energy of both [zeta-zeta-0]TA1 and [zeta-zeta-2-zeta]TA modes associated with the diffuse scattering peaks indicate that a strong lattice instability is involved in the phonon modes. It is pointed out that the lattice instability plays important roles in the structure transition from beta(1)-phase to zeta-phase or to the martensitic phase in the AgZn alloy. C1 NARA WOMENS UNIV,FAC SCI,DEPT PHYS,NARA 630,JAPAN. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MORII, Y (reprint author), JAPAN ATOM ENERGY RES INST,DEPT PHYS,TOKAI,IBARAKI 31911,JAPAN. NR 20 TC 3 Z9 3 U1 0 U2 1 PU PHYSICAL SOCIETY JAPAN PI TOKYO PA KIKAI-SHINKO BUILDING, 3-5-8 SHIBA-KOEN, MINATO-KU, TOKYO 105, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD DEC PY 1991 VL 60 IS 12 BP 4160 EP 4166 DI 10.1143/JPSJ.60.4160 PG 7 WC Physics, Multidisciplinary SC Physics GA GX192 UT WOS:A1991GX19200030 ER PT J AU RENO, JL JONES, ED AF RENO, JL JONES, ED TI PHOTOLUMINESCENCE SPECTROSCOPY OF CDZNTE/CDTE SINGLE STRAINED QUANTUM-WELLS SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article DE CDZNTE/CDTE; QUANTUM WELLS; PHOTOLUMINESCENCE; MBE ID BEAM EPITAXIAL-GROWTH; LAYER SUPERLATTICES; BAND DISCONTINUITY; CDTE-ZNTE; HETEROJUNCTIONS; SEMICONDUCTORS AB We have grown strained Cd1-xZnxTe/CdTe single strained quantum wells by molecular beam epitaxy. The Zn concentration was varied from 10 to 60% and the well widths were systematically increased until the critical thickness was exceeded. Low-temperature (liquid helium) photoluminescence spectroscopy was used to characterize the films. The energy of the quantum well luminescence is consistent with a simple square well model when strain is included. The critical layer thickness for the CdTe quantum wells was found to be in agreement with the model of Matthews and Blakeslee. RP RENO, JL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 23 TC 0 Z9 0 U1 0 U2 0 PU PHYSICAL SOCIETY JAPAN PI TOKYO PA KIKAI-SHINKO BUILDING, 3-5-8 SHIBA-KOEN, MINATO-KU, TOKYO 105, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD DEC PY 1991 VL 60 IS 12 BP 4213 EP 4217 DI 10.1143/JPSJ.60.4213 PG 5 WC Physics, Multidisciplinary SC Physics GA GX192 UT WOS:A1991GX19200036 ER PT J AU WISNER, TW ENGLAND, JM PAN, DY STOKER, AW HALPERN, MS AF WISNER, TW ENGLAND, JM PAN, DY STOKER, AW HALPERN, MS TI TUMOR-IMMUNITY GENERATED IN THE COURSE OF REGRESSION OF V-SRC-INDUCED SARCOMAS SO JOURNAL OF VIROLOGY LA English DT Note ID MURINE FIBRO-SARCOMA; REJECTION ANTIGEN; VIRUS; CHICKENS; DNA; GROWTH AB Previous studies have indicated that the regression versus progression of v-src-DNA-induced sarcomas is dependent on chicken line. As a first step in analyzing the role of tumor immunity as a determinant of this line dependence, experiments were undertaken to ascertain whether an antisarcoma immune response is generated in the course of sarcoma growth in TK chickens, a regressor line. To assay for this response, test TK chickens in which v-src-induced wing web sarcomas had regressed, as well as control TK chickens that had not been exposed to v-src, were challenged in protocols known to yield v-src-dependent sarcoma formation and monitored for challenge sarcoma growth. Compared with the control chickens, the test chickens showed a significant resistance to the sarcomagenic challenge. These results raise the possibility that the antisarcoma response that is inducible in regressor lines, as demonstrated here in terms of a protective effect against a subsequent sarcomagenic challenge, may also underlie the regression of v-src-induced primary sarcomas. C1 WISTAR INST,3601 SPRUCE ST,PHILADELPHIA,PA 19104. MED COLL PENN,DEPT PATHOL & LAB MED,PHILADELPHIA,PA 19129. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. RI stoker, andrew/C-1573-2008 FU NCI NIH HHS [CA-10815, CA-31514] NR 12 TC 15 Z9 15 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD DEC PY 1991 VL 65 IS 12 BP 7020 EP 7024 PG 5 WC Virology SC Virology GA GP878 UT WOS:A1991GP87800078 PM 1658394 ER PT J AU SOREY, ML SUEMNICHT, GA STURCHIO, NC NORDQUIST, GA AF SOREY, ML SUEMNICHT, GA STURCHIO, NC NORDQUIST, GA TI NEW EVIDENCE ON THE HYDROTHERMAL SYSTEM IN LONG VALLEY CALDERA, CALIFORNIA, FROM WELLS, FLUID SAMPLING, ELECTRICAL GEOPHYSICS, AND AGE-DETERMINATIONS OF HOT-SPRING DEPOSITS SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Article ID MONO-COUNTY; NATIONAL-PARK; MAGMA; ISOTOPES; BENEATH; BORON AB Data collected since 1985 from test drilling, fluid sampling, and geologic and geophysical investigations provide a clearer definition of the hydrothermal system in Long Valley caldera than was previously available. This information confirms the existence of high-temperature ( > 200-degrees-C) reservoirs within the volcanic fill in parts of the west moat. These reservoirs contain fluids which are chemically similar to thermal fluids encountered in the central and eastern parts of the caldera. The roots of the present-day hydrothermal system (the source reservoir, principal zones of upflow, and the magmatic heat source) most likely occur within metamorphic basement rocks beneath the western part of the caldera. Geothermometer-temperature estimates for the source reservoir range from 214 to 248-degrees-C. Zones of upflow of hot water could exist beneath the plateau of moat rhyolite located west of the resurgent dome or beneath Mammoth Mountain. Lateral flow of thermal water away from such upflow zones through reservoirs in the Bishop Tuff and early rhyolite accounts for temperature reversals encountered in most existing wells. Dating of hot-spring deposits from active and inactive thermal areas confirms previous interpretations of the evolution of hydrothermal activity that suggest two periods of extensive hot-spring discharge, one peaking about 300 ka and another extending from about 40 ka to the present. The onset of hydrothermal activity around 40 ka coincides with the initiation of rhyolitic volcanism along the Mono-Inyo Craters volcanic chain that extends beneath the caldera's west moat. C1 UNOCAL GEOTHERMAL DIV,SANTA ROSA,CA 95406. ARGONNE NATL LAB,ARGONNE,IL 60439. RP SOREY, ML (reprint author), US GEOL SURVEY,MENLO PK,CA 94025, USA. NR 89 TC 49 Z9 49 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD DEC PY 1991 VL 48 IS 3-4 BP 229 EP 263 DI 10.1016/0377-0273(91)90045-2 PG 35 WC Geosciences, Multidisciplinary SC Geology GA HB371 UT WOS:A1991HB37100001 ER PT J AU GOFF, F WOLLENBERG, HA BROOKINS, DC KISTLER, RW AF GOFF, F WOLLENBERG, HA BROOKINS, DC KISTLER, RW TI A SR-ISOTOPIC COMPARISON BETWEEN THERMAL WATERS, ROCKS, AND HYDROTHERMAL CALCITES, LONG VALLEY CALDERA, CALIFORNIA SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Article ID CENTRAL SIERRA-NEVADA; NEW-MEXICO; GEOTHERMAL SYSTEM; JEMEZ MOUNTAINS; MONO-COUNTY; HOT SPRINGS; GEOCHEMISTRY AB The Sr-87/Sr-86 values of thermal waters and hydrothermal calcites of the Long Valley caldera geothermal system are more radiogenic than those of young intracaldera volcanic rocks. Five thermal waters display Sr-87/Sr-86 of 0.7081-0.7078 but show systematically lighter values from west to east in the direction of lateral flow. We believe the decrease in ratio from west to east signifies increased interaction of deeply circulating thermal water with relatively fresh volcanic rocks filling the caldera depression. All types of pre-, syn-, and post-caldera volcanic rocks in the west and central caldera have (Sr-87/Sr-86). between about 0.7060 and 0.7072 and values for Sierra Nevada granodiorites adjacent to the caldera are similar. Sierran pre-intrusive metavolcanic and metasedimentary rocks can have considerably higher Sr-isotope ratios (0.7061-0.7246 and 0.7090-0.7250, respectively). Hydrothermally altered volcanic rocks inside the caldera have Sr-87/Sr-86)m slightly heavier than their fresh volcanic equivalents and hydrothermal calcites (0.7068-0.7105) occupy a mid-range of values between the volcanic/plutonic rocks and the Sierran metamorphic rocks. These data indicate that the Long Valley geothermal reservoir is first equilibrated in a basement complex that contains at least some metasedimentary rocks. Reequilibration of Sr-isotope ratios to lower values occurs in thermal waters as convecting geothermal fluids flow through the isotopically lighter volcanic rocks of the caldera fill. C1 US GEOL SURVEY,ISOTOPE GEOL BRANCH,MENLO PK,CA 94025. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV GEOCHEM,BERKELEY,CA 94720. UNIV NEW MEXICO,DEPT GEOL,ALBUQUERQUE,NM 87131. RP GOFF, F (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545, USA. NR 50 TC 35 Z9 35 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD DEC PY 1991 VL 48 IS 3-4 BP 265 EP 281 DI 10.1016/0377-0273(91)90046-3 PG 17 WC Geosciences, Multidisciplinary SC Geology GA HB371 UT WOS:A1991HB37100002 ER PT J AU FLEXSER, S AF FLEXSER, S TI HYDROTHERMAL ALTERATION AND PAST AND PRESENT THERMAL REGIMES IN THE WESTERN MOAT OF LONG VALLEY CALDERA SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Article ID OHAKI-BROADLANDS; ILLITE SMECTITE; CALIFORNIA; GEOCHEMISTRY; MINERALOGY; ZEALAND; SYSTEM; AREA; CLAY; USA AB Hydrothermal alteration in caldera-fill Early Rhyolite and Moat Rhyolite was investigated in six western moat drillcores in Long Valley caldera, with an emphasis on clay mineralogy. In two of the cores examined, a complete sequence was observed in argillic alteration of tuffaceous rocks, progressing from smectite (often with kaolinite) to mixed-layer illite-smectite (I/S) to illite with increasing depth. Portions of this sequence were observed in the other four drillcores. Lower-permeability rhyolitic lavas typically showed much sparser clay alteration than tuffs. In cores where alteration progressed through smectite to I/S or illite, the distribution of the clay minerals, and of compositional and structural variation in the I/S phases, allowed estimation of pre-existing alteration temperatures and thermal gradients. I/S (and illite) occurred at the shallowest depths and highest elevations in the Shady Rest (SR) core, and comparable alteration occurred at progressively deeper levels in PLV-1 and INYO-4. Presently observed temperatures are well below preexisting temperatures at comparable depths in these three holes, with the exception of the deeper portion Of SR. Paleo-temperatures in the zone of I/S alteration in the SR hole (approximately 200-250 m depth) were greater-than-or-equal-to 65-degrees-C higher than at present, with a thermal gradient at least twice the steep gradient existing there now. In PLV-1, temperatures near the base of the hole have declined even further than in SR, despite the steep gradient currently observed. In INYO-4, hydrothermal circulation, somewhat what cooler than that in SR and PLV-1, occurred at one time in the deeper portion of the hole, and the steep thermal gradient currently observed at shallower levels in INYO-4 may be the truncated remnant of a gradient that once continued to greater depth. In MLGRAP-1, hydrothermal circulation occurred previously near the base of the hole, but at temperatures probably not far above present ones. No evidence of high-temperature alteration was observed in cores from MLGRAP-2 or PLV-2. RP FLEXSER, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720, USA. NR 35 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD DEC PY 1991 VL 48 IS 3-4 BP 303 EP 318 DI 10.1016/0377-0273(91)90048-5 PG 16 WC Geosciences, Multidisciplinary SC Geology GA HB371 UT WOS:A1991HB37100004 ER PT J AU SMITH, BM SUEMNICHT, GA AF SMITH, BM SUEMNICHT, GA TI OXYGEN ISOTOPE EVIDENCE FOR PAST AND PRESENT HYDROTHERMAL REGIMES OF LONG VALLEY CALDERA, CALIFORNIA SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Article ID INYO VOLCANIC CHAIN; BISHOP-TUFF; SYSTEM AB Whole-rock oxygen isotope compositions of cores and cuttings from Long Valley exploration wells show that the Bishop Tuff has been an important reservoir for both fossil and active geothermal systems within the caldera. The deep Clay Pit-1 and Mammoth-1 wells on the resurgent dome penetrate mildly to strongly altered Bishop Tuff with delta-O-18(WR) values as low as -2.6 parts per thousand (vs V-SMOW). The IDFU 44-16 well intercepts a thinner Bishop Tuff section with delta-O-18(WR) values of +0.4 to +2.3 parts per thousand in the western caldera moat, where milder and more sporadic O-18 depletions occur in Tertiary volcanic rocks of the western caldera floor (delta-O-18(WR) = +2.2 to +6.4 parts per thousand). Bishop Tuff samples from deeper parts of the 715 M RDO-8 (Shady Rest) well in the SW moat are also strongly depleted in O-18 (delta-O-18(WR) = -1.5 to +0.6 parts per thousand). Four shallow thermal gradient wells (469-715 m TD drilled in the western moat did not penetrate Bishop Tuff, but Early Rhyolites from two of these holes are depleted in O-18 (delta-O-18(WR) = -1.2 to + 6.0 parts per thousand in PLV-1 +4.6 to +5.3 parts per thousand in MLGRAP-1), compared to lithologic equivalents from the other two holes (delta-O-18(WR) = +6.3 to +8.0 parts per thousand in PLV-2 and MLGRAP-2). Whole-rock oxygen isotope profiles for the resurgent dome wells are unlike profiles calculated assuming alkali feldspar-H2O fractionation behavior and total O-isotopic equilibration with -14.3 parts per thousand fluids at measured temperatures. The sense of this divergence implies an earlier hydrothermal episode within the central caldera driven by one or more shallow intrusions. Geochemical similarities between an intrusive granophyre at the bottom of the Clay Pit-1 well and a nearby Moat Rhyolite dome with a K/Ar cooling age of approximately 0.5 Ma suggest that vigorous hydrothermal activity beneath the central resurgent gent dome may have occurred as much as approximately 0.5 m.y. ago. Calculated and measured O-isotope profiles are similar for deep wells that penetrate the western moat of the caldera, where steep temperature gradients and low delta-O-18(WR) values in Early Rhyolites from PLV-1 are attributed to an active hydrothermal aquifer that has descended slightly from earlier, shallower elevations. Similarly, severe O-18 depletions in Bishop Tuff samples from the IDFU 44-16 and RDO-8 wells reflect active convection beneath the western moat, whereas milder O-18 depletions in Early Rhyolites from MLGRAP-1 were apparently caused by hydrothermal alteration at lower temperatures. The 0-isotope profiles imply that surface discharge within and around the resurgent dome results from shallow, eastward-directed outflow from a zone of higher enthalpy hydrothermal upflow beneath the western caldera moat. Intrusive magmatic heat source(s) are inferred to exist beneath the western moat, perhaps beneath Mammoth Mountain. C1 UNOCAL GEOTHERMAL DIV,SANTA ROSA,CA 95406. RP SMITH, BM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,CTR ISOTOPE GEOCHEM,1 CYCLOTRON RD,BERKELEY,CA 94720, 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 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD DEC PY 1991 VL 48 IS 3-4 BP 319 EP 339 DI 10.1016/0377-0273(91)90049-6 PG 21 WC Geosciences, Multidisciplinary SC Geology GA HB371 UT WOS:A1991HB37100005 ER PT J AU KRASNANSKY, R YAMAMURA, S THOMAS, JK DELLAGUARDIA, R AF KRASNANSKY, R YAMAMURA, S THOMAS, JK DELLAGUARDIA, R TI PHOTOPRODUCTION OF GOLD COLLOIDS AND FILMS SO LANGMUIR LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; LASER; CARBON AB The photochemical and the photothermal induced decomposition events of dimethylgold(III) hexafluoroacetylacetonate (DMG-HF) have been monitored in real time on the microsecond time scale in solution and in condensed films. Photochemical decomposition of DMG-HF occurs via the triplet excited state of DMG-HF while photothermal decomposition proceeds via "seed" zones, zones which are initially produced and act as thermal conversion sites. Both photolytic and photothermal decomposition of DMG-HF produce intermediates that yield colloid gold and gold films. C1 UNIV NOTRE DAME,DEPT CHEM & BIOCHEM,NOTRE DAME,IN 46556. BROOKHAVEN NATL LAB,IBM,NSLS,IBM V6,UPTON,NY 11973. NR 22 TC 12 Z9 12 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD DEC PY 1991 VL 7 IS 12 BP 2881 EP 2886 DI 10.1021/la00060a003 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA GW868 UT WOS:A1991GW86800005 ER PT J AU HANSEN, RS AF HANSEN, RS TI STABILITY OF INTERCONNECTED BUBBLE NETWORKS SO LANGMUIR LA English DT Article AB Two connected bubbles stabilized by films of the same tension in the same external environment can only be in equilibrium if they have the same radius. But where sigma is the surface tension, A is the external area of a bubble, and E = 2(d-sigma/d ln A) is the Gibbs elasticity, the equilibrium is only stable if E - sigma > 0. The fluctuation caused by an infinitesimal transfer of material from one bubble to the other will grow or decrease exponentially in time depending on whether E - sigma is negative or positive, and models for calculating this rate are given. Literature data on the surface tensions of aqueous solutions of the alcohols CH3(CH2)n-1OH, 6 less-than-or-equal-to n less-than-or-equal-to 10 are used to model bubble stability in two modes. First, it is supposed that the bubble film is 1-mu-m thick with its aqueous phase uniform in alcohol concentration within the film; conditions for "windows of stability" are derived, within which bubbles can be expanded or contracted. Second, the film is assumed to consist of an "oil" layer 6-mu-m thick with a 1-mu-m thick aqueous layer on either side of it; at equilibrium the alcohol concentration in the "oil" is assumed K times that in the aqueous phase. All transport is assumed diffusion-limited. With the film initially at rest, the area is subjected to periodic cycling, and both steady periodic and transient responses of the surface tension are calculated. This model is intended to simulate qualitatively the behavior of the collection of alveoli in human respiration. For suitable parameter choices certain aspects of the latter behavior are rather well simulated; specifically there is a substantial amplitude to the surface tension variation and its phase shift is such that the surface tension is greater during the area expansion, less during contraction, than if it is exactly in phase with the area cycling. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP HANSEN, RS (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD DEC PY 1991 VL 7 IS 12 BP 3070 EP 3075 DI 10.1021/la00060a028 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA GW868 UT WOS:A1991GW86800030 ER PT J AU SOMORJAI, GA AF SOMORJAI, GA TI THE FLEXIBLE SURFACE - CORRELATION BETWEEN REACTIVITY AND RESTRUCTURING ABILITY SO LANGMUIR LA English DT Article ID CRYSTAL-SURFACES; CHEMISORPTION; CO; ADSORPTION; MECHANISM; ETHYLENE; PLATINUM; PT(111); GOLD AB Studies of the surface structure of metals on the atomic scale indicate the restructuring the clean surfaces with respect to their bulk atomic structure. Inward relaxation and reconstruction are more pronounced at steps, at open surfaces, and at low coordination sites. Chemisorption causes adsorbate-induced restructuring which drastically changes the surface structure. Such restructuring events occur on the time scale of chemisorption, on the time scale of catalytic reactions, and on a longer time scale that leads to redispersion and sintering. Thermodynamic considerations indicate more facile adsorption-induced restructuring for more open surfaces where atoms have fewer nearest neighbors (flexible surfaces) while close packed surfaces are less likely to restructure (rigid surfaces). The dynamical restructuring of surfaces on the atomic scale during chemisorption and catalytic reactions explains several puzzles of surface chemistry and heterogeneous catalysis. In surface chemistry, these include (1) the transition from physisorption to chemisorption, (2) why rough surfaces are more active in chemical bond breaking and in catalysis, (3) epitaxy, and (4) unusual coverage-dependent changes of bonding. In heterogeneous catalysis the dynamic model of surfaces may also shed light on why certain reactions are structure insensitive and on the unique activity of bimetallic and oxide-metal interface systems. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP SOMORJAI, GA (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 33 TC 59 Z9 59 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD DEC PY 1991 VL 7 IS 12 BP 3176 EP 3182 DI 10.1021/la00060a043 PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA GW868 UT WOS:A1991GW86800045 ER PT J AU GREENE, RM GEIDER, RJ FALKOWSKI, PG AF GREENE, RM GEIDER, RJ FALKOWSKI, PG TI EFFECT OF IRON LIMITATION ON PHOTOSYNTHESIS IN A MARINE DIATOM SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Article; Proceedings Paper CT SYMP ON WHAT CONTROLS PHYTOPLANKTON PRODUCTION IN NUTRIENT-RICH AREAS OF THE OPEN SEA CY FEB 22-24, 1991 CL SAN MARCOS, CA SP AMER SOC LIMNOL & OCEANOG ID ISOCHRYSIS-GALBANA HAPTOPHYCEAE; STEADY-STATE PHOTOSYNTHESIS; SUB-TROPICAL GYRE; PHYTOPLANKTON GROWTH; NITROGEN LIMITATION; ENERGY-CONVERSION; PHOTOSYSTEM-II; PHAEODACTYLUM-TRICORNUTUM; SKELETONEMA-COSTATUM; MICROALGAL GROWTH AB The response of the marine diatom Phaeodactylum tricornutum to Fe deficiency was evaluated in the context of fundamental physiological models of growth and photosynthesis. Fe deficiency induced chlorosis, which decreased Chl a:C ratios and Chl a-specific light-saturated photosynthesis (P(m)B). In contrast to P(m)B, alpha(B) was slightly increased under Fe deficiency, and photosynthesis in Fe-deficient cells became light-saturated at lower irradiances than in Fe-replete cells grown at the same irradiance. Fe deficiency increased the in vivo absorption cross section normalized to Chl a (a*), but decreased the maximum quantum yield of photosynthesis (phi(m)). Thus, the product a*-phi(m), which equals the Chl a-specific initial slope of the photosynthesis-irradiance curve (alpha(B)), was less sensitive to Fe limitation than was a* or phi(m) alone. Using a pump-and-probe fluorometer, we found that Fe deficiency reduced the maximum fluorescence yield (DELTA-phi(sat)), which is consistent with the reduction in phi(m), but increased the absorption cross section of photosystem 2(sigma(PS2)). Immunoassays of proteins separated electrophoretically indicated that the reduction in maximum fluorescence yields was accompanied by a reduction in the relative abundance of D1, the photosystem 2 reaction center protein. Light-harvesting chlorophyll proteins (LHCP) and the large and small subunits of ribulose bisphosphate carboxylase were not affected by Fe deficiency. Changes in the abundance of D1 relative to LHCP suggest an increase in the fraction of nonfunctional reaction centers under Fe-limited conditions. Fe-deficient cells, growing at < 20% of their maximum growth rate, had reduced cellular C, N, and P contents, but maintained C:N:P ratios at the Redfield proportions. These results imply that C:N:P ratios do not provide an unequivocal index of relative growth rate. C1 UNIV DELAWARE,COLL MARINE STUDIES,LEWES,DE 19958. RP GREENE, RM (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. RI Greene, Richard/G-9685-2013 NR 54 TC 194 Z9 205 U1 1 U2 15 PU AMER SOC LIMNOLOGY OCEANOGRAPH PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 SN 0024-3590 J9 LIMNOL OCEANOGR JI Limnol. Oceanogr. PD DEC PY 1991 VL 36 IS 8 BP 1772 EP 1782 PG 11 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA HR981 UT WOS:A1991HR98100020 ER PT J AU PENG, TH BROECKER, WS AF PENG, TH BROECKER, WS TI FACTORS LIMITING THE REDUCTION OF ATMOSPHERIC CO2 BY IRON FERTILIZATION SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Article; Proceedings Paper CT SYMP ON WHAT CONTROLS PHYTOPLANKTON PRODUCTION IN NUTRIENT-RICH AREAS OF THE OPEN SEA CY FEB 22-24, 1991 CL SAN MARCOS, CA SP AMER SOC LIMNOL & OCEANOG AB A limit on the reduction in atmospheric CO2 partial pressure (pCO2) in the next century resulting from purposeful Fe fertilization of the Antarctic Ocean is estimated with an advection-diffusion model calibrated with transient tracer distributions. To evaluate the possible increase in atmospheric CO2 with and without fertilization, we adopt a "business-as-usual" scenario of anthropogenic CO2 emission. Such increase is computed from the atmospheric pCO2 in the ocean-atmosphere total C system as it responds to this emission scenario. Assuming completely successful Fe fertilization, we calculate an 8% atmospheric CO2 reduction for a case with a 3 cm2 s-1 vertical diffusivity and 17.4 Sv upwelling flux, as derived from distribution of bomb-C-14 in the ocean. Hence, if atmospheric pCO2 reaches 800-mu-atm in the next century, the maximum possible reduction is approximately 64-mu-atm. Doubling of upwelling flux to 34.8 Sv results in a reduction of 96-mu-atm. If we assume the surface area of the Antarctic Ocean is 16% of the total ocean area instead of 10% as used in the standard case, the reduction is approximately 71-mu-atm. These results are independent of the respiration function adopted. As we hold the surface water PO4 content at a near-zero value, it makes no difference at what depth the organic material is oxidized (or whether it falls to the bottom and accumulates). Changes in the ps exchange rate over the Antarctic Ocean also do not have a significant effect on the magnitude of atmospheric CO2 drawdown. Doubling the gas exchange rate in the Antarctic region after fertilization results in a reduction of 68-mu-atm. Doubling of vertical diffusivity to 6 cm2 s-1 in Antarctic deep water yields a reduction of 75-mu-atm. The key parameters are the rate of upwelling in the Antarctic and the fate of this upwelled water. The length of the productive season influences the extent of pCO2 reduction. For 8 months of productive fertilization our model yields a reduction of 60-mu-atm, for 4 months a reduction of 50-mu-atm, and for 2 months a reduction of 40-mu-atm. The maximum O2 consumption in our standard case is estimated to be 133-mu-mol kg-1 at a depth of 600 m. However, O2 consumption depends on the reoxidation function in the subsurface water. If the organic flux reoxidizes completely in the upper 2,000 m, the maximum consumption of O2 at 500 m could reach 500-mu-mol kg-1. Hence, depending on the reoxidation function, an anoxic Antarctic thermocline could result from Fe fertilization. Both calculations regarding the seasonality of production and those regarding oxygen reduction are highly sensitive to parameters over which we have little control. They are included only to emphasize their potential importance. C1 COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964. RP PENG, TH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 23 TC 27 Z9 27 U1 0 U2 8 PU AMER SOC LIMNOLOGY OCEANOGRAPH PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 SN 0024-3590 J9 LIMNOL OCEANOGR JI Limnol. Oceanogr. PD DEC PY 1991 VL 36 IS 8 BP 1919 EP 1927 PG 9 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA HR981 UT WOS:A1991HR98100031 ER PT J AU KATES, M ADAMS, GA BLANK, ML SNYDER, F AF KATES, M ADAMS, GA BLANK, ML SNYDER, F TI CHEMICAL SYNTHESIS AND PHYSIOLOGICAL-ACTIVITY OF SULFONIUM ANALOGS OF PLATELET-ACTIVATING-FACTOR SO LIPIDS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON PLATELET-ACTIVATING FACTOR AND STRUCTURALLY RELATED ALKYLI ETHER LIPIDS CY MAY, 1989 CL TOKYO, JAPAN SP PHARM SOC JAPAN, FDN ADV INT SCI, JAPAN SOC ALLERGOL, JAPANESE INFLAMMAT SOC, JAPANESE BIOCHEM SOC, JAPANESE PHARM SOC, JAPANESE CONF BIOCHEM LIPIDS ID ALKYL-PHOSPHOLIPID ANALOGS; FLUORESCENCE POLARIZATION; CYTO-TOXICITY; PHOSPHATIDYLCHOLINE; PHOSPHATIDYLSULFOCHOLINE; LIPOSOMES; CELLS AB Phosphatidylsulfocholine (PSC), the sulfonium analogue of phosphatidylcholine (PC), occurs naturally in some diatoms. The replacement of the -N+(CH3)3 group by a -S+(CH3)2 results in an increase in the polar head group size in PSC relative to that of PC, consistent with the observed increase in permeability of PSC bilayers towards urea. It was of interest to see whether replacement of the -N+(CH3)3 group in platelet activating factor (PAF) by an -S+(CH3)2 group leads to any change in platelet aggregation or other physiological activity. Synthesis of the sulfonium analogue of PAF was carried out by suitable modifications of known procedures. The PAF-sulfonium analogue was found to have almost the same platelet aggregating activity as PAF itself, in the concentration range 1-20-mu-M, but a much lower activity in the range 0.01-1-mu-M. The analogue had little or no effect on the platelet aggregation activity of PAF when added in the concentration range 0.01-1-mu-M and had about half the hypotensive activity of PAF towards hypertensive CDF male rats. The sulfonium analogue, however, was much more cytotoxic to HL-60 cells than PAF itself, in the concentration range 0-15-mu-M; replacement of the acetate group by a benzyl group increased the cytotoxicity to the level of that of the methoxy analogue of PAF. Thus, replacement of the -N+(CH3)3 group by a -S+(CH3)2 group in the polar head group region of PAF results in a relatively small change in its platelet aggregation activity and a decrease in its hypotensive activity, but greatly increases its antitumor activity. C1 UNIV OTTAWA,OTTAWA CIVIC HOSP,INST HEART,OTTAWA K1Y 4E9,ONTARIO,CANADA. OAK RIDGE ASSOCIATED UNIV,DIV MED & HLTH SCI,OAK RIDGE,TN 37831. RP KATES, M (reprint author), UNIV OTTAWA,DEPT BIOCHEM,OTTAWA K1N 9B4,ONTARIO,CANADA. NR 21 TC 3 Z9 3 U1 1 U2 3 PU AMER OIL CHEMISTS SOC PI CHAMPAIGN PA 1608 BROADMOOR DRIVE, CHAMPAIGN, IL 61821-0489 SN 0024-4201 J9 LIPIDS JI Lipids PD DEC PY 1991 VL 26 IS 12 BP 1095 EP 1101 DI 10.1007/BF02536509 PG 7 WC Biochemistry & Molecular Biology; Nutrition & Dietetics SC Biochemistry & Molecular Biology; Nutrition & Dietetics GA GZ483 UT WOS:A1991GZ48300027 PM 1819693 ER PT J AU KELTNER, JR CARLSON, JW ROOS, MS WONG, STS WONG, TL BUDINGER, TF AF KELTNER, JR CARLSON, JW ROOS, MS WONG, STS WONG, TL BUDINGER, TF TI ELECTROMAGNETIC-FIELDS OF SURFACE COIL INVIVO NMR AT HIGH-FREQUENCIES SO MAGNETIC RESONANCE IN MEDICINE LA English DT Article ID PENETRATION; SAMPLES C1 UNIV CALIF SAN FRANCISCO,RADIOL IMAGING LAB,S SAN FRANCISCO,CA 94080. RP KELTNER, JR (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL 25840, HL 07367] NR 12 TC 89 Z9 90 U1 1 U2 6 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0740-3194 J9 MAGNET RESON MED JI Magn.Reson.Med. PD DEC PY 1991 VL 22 IS 2 BP 467 EP 480 DI 10.1002/mrm.1910220254 PG 14 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA GV211 UT WOS:A1991GV21100042 PM 1812380 ER PT J AU WIKFORS, GH NEEMAN, A JACKSON, PJ AF WIKFORS, GH NEEMAN, A JACKSON, PJ TI CADMIUM-BINDING POLYPEPTIDES IN MICROALGAL STRAINS WITH LABORATORY-INDUCED CADMIUM TOLERANCE SO MARINE ECOLOGY PROGRESS SERIES LA English DT Article ID EUGLENA-GRACILIS; NAVICULA-INCERTA; DATURA-INNOXIA; ZINC; GROWTH; COPPER; RESISTANT; COMPLEXES; TOXICITY; METALS AB Strains of 5 algal species that have been induced to develop tolerance to previously toxic cadmium (Cd) concentrations were investigated for production of the Cd-binding polypeptides, poly(gamma-glutamylcysteinyl)glycines, (gamma-EC)(n)G. Liquid chromatography using Sephadex G-50, ICP analysis of Cd in chromatographic fractions, and amino acid analysis provided clear evidence of (gamma-EC)(n)G production in the 2 most tolerant species, Phaeodactylum tricornutum and Dunaliella tertiolecta. Production of Cd-binding peptide in P. tricornutum was positively correlated with cellular Cd content, on a dry-weight basis. In contrast, Cd-tolerant strains of Isochrysis galbana, Pavlova lutheri, and Tetraselmis maculata did not produce detectable (gamma-EC)(n)G. Although Cd-tolerant I. galbana differed from the control strain in some aspects of polypeptide content, as seen by the production of thiol-rich compounds, the specific mechanism for enhanced Cd tolerance in the 3 species that do not produce (gamma-EC)(n)G remains unknown. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV LIFE SCI, GENOM & STRUCT BIOL GRP, LOS ALAMOS, NM 87545 USA. RP WIKFORS, GH (reprint author), NOAA, NATL MARINE FISHERIES SERV, NE FISHERIES SCI CTR, MILFORD, CT 06460 USA. NR 36 TC 24 Z9 25 U1 1 U2 3 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0171-8630 J9 MAR ECOL PROG SER JI Mar. Ecol.-Prog. Ser. PD DEC PY 1991 VL 79 IS 1-2 BP 163 EP 170 DI 10.3354/meps079163 PG 8 WC Ecology; Marine & Freshwater Biology; Oceanography SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography GA HF034 UT WOS:A1991HF03400014 ER PT J AU BLOOM, I FROMMELT, JM HASH, MC LANAGAN, MT WU, CT GORETTA, KC AF BLOOM, I FROMMELT, JM HASH, MC LANAGAN, MT WU, CT GORETTA, KC TI SOLID-STATE SYNTHESIS OF BI2SR2CACU2OX SUPERCONDUCTOR SO MATERIALS RESEARCH BULLETIN LA English DT Article DE OXIDE; BISMUTH; COPPER ID YBA2CU3O7-X; COMPOUND AB The high-temperature superconducting material Bi2Sr2CaCu2O(x) (2212) was synthesized by reaction of oxides and carbonates. Several stoichiometries and a range of temperatures and oxygen partial pressures were investigated for the production of pure 2212. The reaction sequence to form Bi2Sr2CaCu2O(x) was found to consist of initial formation of Bi compounds, their subsequent reaction to form the Bi2Sr2CuO(x) phase and Ca-Cu oxides, and a slow reaction to form the Bi2Sr2CaCu2O(x) phase. The best powder was made from a Bi:Sr:Ca:Cu composition equal to 2.0:1.7:1.0:2.0. The optimum heat treatment was found to consist of initial heating to about 725-degrees-C in flowing oxygen at a reduced total pressure of 5 x 10(2) Pa, followed by brief heating in air to about 885-degrees-C, and, finally heating in air at 842-degrees-C for 2 to 3 days. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. RP BLOOM, I (reprint author), ARGONNE NATL LAB,ELECTROCHEM TECHNOL PROGRAM,ARGONNE,IL 60439, USA. NR 26 TC 26 Z9 26 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0025-5408 J9 MATER RES BULL JI Mater. Res. Bull. PD DEC PY 1991 VL 26 IS 12 BP 1269 EP 1276 DI 10.1016/0025-5408(91)90141-8 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA GT545 UT WOS:A1991GT54500004 ER PT J AU SIMMONS, GA AF SIMMONS, GA TI MHD ACCELERATOR SO MECHANICAL ENGINEERING LA English DT Letter RP SIMMONS, GA (reprint author), IDAHO NATL ENGN LAB,MHD COMPONENT DEV & INTEGRAT FACIL,BUTTE,MT, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0025-6501 J9 MECH ENG JI Mech. Eng. PD DEC PY 1991 VL 113 IS 12 BP 6 EP & PG 0 WC Engineering, Mechanical SC Engineering GA GU934 UT WOS:A1991GU93400006 ER PT J AU RAWERS, JC MCCUNE, RA DUNNING, JS AF RAWERS, JC MCCUNE, RA DUNNING, JS TI ULTRASOUND TREATMENT OF CENTRIFUGALLY ATOMIZED 316 STAINLESS-STEEL POWDERS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article AB The Bureau of Mines is studying the surface characteristics of rapidly solidified powders and the potential for surface modification of fine powders prior to consolidation. The surface modification and work hardening of fine powders were accomplished by applying high-energy ultrasound to centrifugally atomized austenitic 316 stainless steel powders suspended in liquid media. Cavitation implosion changed the surface morphology, hammering the surface and occasionally fretting off microchips of work-hardened metal. Ultrasound-cavitation work-hardened metal powder surfaces producing a strained, duplex austenite face-centered cubic (fcc)-martensite body-centered tetragonal (bct) phase structure. The amount of work hardening depended upon the quantity of ultrasound energy used, considering both power level and experimental time. Work hardening was relatively independent of the liquid media used. RP RAWERS, JC (reprint author), US DEPT INTERIOR,BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD DEC PY 1991 VL 22 IS 12 BP 3025 EP 3033 DI 10.1007/BF02650263 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA GU035 UT WOS:A1991GU03500020 ER PT J AU KURZ, W TRIVEDI, R AF KURZ, W TRIVEDI, R TI EUTECTIC GROWTH UNDER RAPID SOLIDIFICATION CONDITIONS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID STABILITY; MODEL AB The model for rapid solidification of eutectics developed recently by the authors is extended: (1) the effect of the localization of the diffusion field which leads to a complex series solution is described by an approximation which makes the prediction of eutectic microstructures a simple matter and (2) the loss of local equilibrium at the solid-liquid interface is taken into account through a growth rate-dependent effective liquidus slope and solute distribution coefficient, leading to a depression of the eutectic temperature and a substantial increase in the solute content of the eutectic phases at growth rates larger than some centimeters per second. The importance of high growth rate effect is demonstrated for a linearized phase diagram. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT MAT SCI & ENGN,AMES,IA 50011. RP KURZ, W (reprint author), SWISS FED INST TECHNOL,DEPT MAT ENGN,CH-1015 LAUSANNE,SWITZERLAND. NR 14 TC 82 Z9 85 U1 3 U2 15 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD DEC PY 1991 VL 22 IS 12 BP 3051 EP 3057 DI 10.1007/BF02650266 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA GU035 UT WOS:A1991GU03500023 ER PT J AU BLANDER, M UNGER, L PELTON, A ERICKSSON, G AF BLANDER, M UNGER, L PELTON, A ERICKSSON, G TI A POSSIBLE ORIGIN OF EL6 CHONDRITES FROM A HIGH TEMPERATURE-HIGH PRESSURE SOLAR GAS SO METEORITICS LA English DT Meeting Abstract ID THERMODYNAMIC ANALYSIS C1 ARGONNE NATL LAB,ARGONNE,IL 60439. PURDUE UNIV N CENT,WESTVILLE,IN 46391. ECOLE POLYTECH,MONTREAL H3C 3A7,QUEBEC,CANADA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 320 EP 320 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900029 ER PT J AU BOURCIER, WL ZOLENSKY, ME AF BOURCIER, WL ZOLENSKY, ME TI AQUEOUS ALTERATION ON THE PARENT BODIES OF CARBONACEOUS CHONDRITES - COMPUTER-SIMULATIONS OF LATE-STAGE OXIDATION SO METEORITICS LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NASA,LYNDON B JOHNSON SPACE CTR,PLANETARY SCI BRANCH,HOUSTON,TX 77058. NR 3 TC 3 Z9 3 U1 0 U2 1 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 321 EP 322 PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900034 ER PT J AU HARTMANN, DH HOFFMAN, RD HOWARD, WM MEYER, BS AF HARTMANN, DH HOFFMAN, RD HOWARD, WM MEYER, BS TI NUCLEOSYNTHESIS IN NEUTRON-RICH SUPERNOVA EJECTA SO METEORITICS LA English DT Meeting Abstract C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. UNIV CALIF SANTA CRUZ,UCO LICK OBSERV,SANTA CRUZ,CA 95064. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 5 TC 1 Z9 1 U1 1 U2 1 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 342 EP 342 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900086 ER PT J AU HOWARD, WM CLAYTON, DD MEYER, BS AF HOWARD, WM CLAYTON, DD MEYER, BS TI XE-H AND BA-H FROM WEAK NEUTRON BURST SO METEORITICS LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CLEMSON UNIV,DEPT PHYS,CLEMSON,SC 29634. NR 3 TC 0 Z9 0 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 347 EP 347 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900099 ER PT J AU NIEMEYER, S ESSER, BK AF NIEMEYER, S ESSER, BK TI RE-OS CHRONOLOGY OF IAB, IIE, AND IIIAB IRON-METEORITES SO METEORITICS LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Esser, Bradley/G-4283-2010 OI Esser, Bradley/0000-0002-3219-4298 NR 3 TC 2 Z9 2 U1 0 U2 1 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 378 EP 379 PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900177 ER PT J AU NISHIIZUMI, K CAFFEE, MW FINKEL, RC ARNOLD, JR AF NISHIIZUMI, K CAFFEE, MW FINKEL, RC ARNOLD, JR TI BE-110 AND MN-53 IN NON-ANTARCTIC IRON-METEORITES SO METEORITICS LA English DT Meeting Abstract C1 UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI fink, David/A-9518-2012 NR 4 TC 14 Z9 14 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 379 EP 380 PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900180 ER PT J AU REDDY, RC AF REDDY, RC TI COSMOGENIC-NUCLIDE PRODUCTION IN VERY LARGE METEORITES SO METEORITICS LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV SPACE SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 6 TC 0 Z9 0 U1 0 U2 1 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 387 EP 388 PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900201 ER PT J AU SISTERSON, JM JULL, AJT DONAHUE, DJ KOEHLER, AM REEDY, RC ENGLERT, PAJ AF SISTERSON, JM JULL, AJT DONAHUE, DJ KOEHLER, AM REEDY, RC ENGLERT, PAJ TI CROSS-SECTIONS FOR PRODUCTION OF C-14 FROM OXYGEN AND SILICON - IMPLICATIONS FOR COSMOGENIC PRODUCTION-RATES SO METEORITICS LA English DT Meeting Abstract C1 SAN JOSE STATE UNIV,DEPT CHEM,SAN JOSE,CA 92521. HARVARD UNIV,HARVARD CYCLOTRON LAB,CAMBRIDGE,MA 02138. UNIV ARIZONA,NSF ACCELERATOR FAC RADIOISOTOPE ANAL,TUCSON,AZ 85721. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 7 TC 7 Z9 7 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 395 EP 396 PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900220 ER PT J AU WACKER, JF AF WACKER, JF TI COSMOGENIC AL-26 ACTIVITIES IN ANTARCTIC AND NON-ANTARCTIC METEORITES SO METEORITICS LA English DT Meeting Abstract ID POPULATIONS C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD DEC PY 1991 VL 26 IS 4 BP 404 EP 404 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HF779 UT WOS:A1991HF77900242 ER PT J AU WANG, ZL BENTLEY, J AF WANG, ZL BENTLEY, J TI ENERGY-FILTERED HREM IMAGES OF VALENCE-LOSS ELECTRONS SO MICROSCOPY MICROANALYSIS MICROSTRUCTURES LA English DT Article ID INELASTICALLY SCATTERED ELECTRONS; DIFFRACTION; MICROSCOPY AB A theory is proposed to include the effects of valence excitations in electron image simulations for high-resolution electron microscopy (HREM) based on the single inelastic scattering model. Under the small thickness approximation, this general theory reduces to the simplified theory of perfectly delocalized inelastic scattering model, in which the image can be considered to be an incoherent sum of those incident electrons of different energies weighted by the intensity distribution in the electron energy-loss spectrum from the area where the pattern was taken. The main effect of valence-loss is to introduce a focus shift due to chromatic aberration, resulting in contrast variation (or reversal) of the image. The generalization of this theory for simulations of interface images with considering surface and interface plasmon excitations is given. Calculations for GaAs surface profile images are demonstrated to show the effect of inelastic localization. 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 29 TC 3 Z9 3 U1 0 U2 0 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 1154-2799 J9 MICROSC MICROANAL M JI Microsc. Microanal. Microstruct. PD DEC PY 1991 VL 2 IS 6 BP 569 EP 588 PG 20 WC Microscopy; Spectroscopy SC Microscopy; Spectroscopy GA HT724 UT WOS:A1991HT72400002 ER PT J AU PAWLOWSKI, K KLOSSE, U DEBRUIJN, FJ AF PAWLOWSKI, K KLOSSE, U DEBRUIJN, FJ TI CHARACTERIZATION OF A NOVEL AZORHIZOBIUM-CAULINODANS ORS571 2-COMPONENT REGULATORY SYSTEM, NTRY/NTRX, INVOLVED IN NITROGEN-FIXATION AND METABOLISM SO MOLECULAR & GENERAL GENETICS LA English DT Article DE AZORHIZOBIUM-CAULINODANS ORS571; NIFA REGULATION; NITROGEN REGULATION; 2-COMPONENT REGULATORY SYSTEM; NITROGEN FIXATION AND METABOLISM ID TRANSPOSON TN5 MUTAGENESIS; NADPH-GLUTAMATE SYNTHASE; RHIZOBIUM-MELILOTI; ESCHERICHIA-COLI; SESBANIA-ROSTRATA; NUCLEOTIDE-SEQUENCE; GENE-EXPRESSION; SIGNAL TRANSDUCTION; R-MELILOTI; NTRC GENE AB Azorhizobium caulinodans ORS571 nifA regulation is partially mediated by the nitrogen regulatory gene ntrC. However, the residual nifA expression in ntrC mutant strains is still modulated by the cellular nitrogen and oxygen status. A second ntrC-homologous region, linked to ntrC, was identified and characterized by site-directed insertion mutagenesis and DNA sequencing. Tn5 insertions in this region cause pleiotropic defects in nitrogen metabolism and affect free-living as well as symbiotic nitrogen fixation. DNA sequencing and complementation studies revealed the existence of a bicistronic operon (ntrYX). NtrY is likely to represent the transmembrane 'sensor' protein element in a two-component regulatory system. NtrX shares a high degree of homology with NtrC proteins of other organisms and probably constitutes the regulator protein element. The regulation of the ntrYX and ntrC loci and the effects of ntrYX, ntrY and ntrX mutations on nifA expression were examined using beta-galactosidase gene fusions. NtrY/NtrX were found to modulate nifA expression and ntrYX transcription was shown to be partially under the control of NtrC. C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. MAX PLANCK INST ZUCHTUNGSFORSCH,W-5000 COLOGNE 30,GERMANY. MICHIGAN STATE UNIV,DEPT MICROBIOL,E LANSING,MI 48824. OI Pawlowski, Katharina/0000-0003-2693-885X NR 71 TC 80 Z9 88 U1 1 U2 7 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0026-8925 J9 MOL GEN GENET JI Mol. Gen. Genet. PD DEC PY 1991 VL 231 IS 1 BP 124 EP 138 DI 10.1007/BF00293830 PG 15 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA GX581 UT WOS:A1991GX58100017 PM 1661370 ER PT J AU SIPLEY, J DUNN, J GOLDMAN, E AF SIPLEY, J DUNN, J GOLDMAN, E TI BACTERIOPHAGE T7 MORPHOGENESIS AND GENE 10 FRAMESHIFTING IN ESCHERICHIA-COLI SHOWING DIFFERENT DEGREES OF RIBOSOMAL FIDELITY SO MOLECULAR & GENERAL GENETICS LA English DT Article DE FRAMESHIFTING; PHAGES T7, T3, AND T4; RIBOSOMAL FIDELITY; TRANSLATIONAL ACCURACY; STREPTOMYCIN ID POLYMERASE-III HOLOENZYME; HYPER-ACCURATE RIBOSOMES; RELEASE FACTOR-II; GAMMA-SUBUNIT; READING FRAME; TRANSFER-RNA; SUPPRESSION; MUTANTS; DNA; TRANSLATION AB Bacteriophage T7 infection has been studied in Escherichia coli strains showing both increased and decreased ribosome fidelity and in the presence of streptomycin, which stimulates translational misreading, in an effort to determine effects on the apparent programmed translational frameshift that occurs during synthesis of the gene 10 capsid protein. Quantitation of the protein bands from SDS-PAGE failed to detect any significant effects on the amounts of the shifted 10B protein relative to the in-frame 10A protein under all fidelity conditions tested. However, any changes in fidelity conditions led to inhibition of phage morphogenesis in single-step growth experiments, which could not be accounted for by reduced amounts of phage protein synthesis, nor, at least in the case of decreased accuracy, by reduced amounts of phage DNA synthesis. Reduction in phage DNA synthesis did appear to account for a substantial proportion of the reduction in phage yield seen under conditions of increased accuracy. Similar effects of varying ribosomal fidelity on growth were also seen with phage T3, and to a lesser extent with phage T4. The absence of change in the high-frequency T7 gene 10 frameshift differs from earlier reports that ribosomal fidelity affects low-frequency frameshift errors. C1 UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT MICROBIOL & MOLEC GENET,185 S ORANGE AVE,NEWARK,NJ 07103. UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,GRAD SCH BIOMED SCI,NEWARK,NJ 07103. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NCI NIH HHS [CA00890]; NIGMS NIH HHS [GM27711] NR 50 TC 6 Z9 7 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0026-8925 J9 MOL GEN GENET JI Mol. Gen. Genet. PD DEC PY 1991 VL 230 IS 3 BP 376 EP 384 DI 10.1007/BF00280294 PG 9 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA GV590 UT WOS:A1991GV59000006 PM 1766436 ER PT J AU CUDDEFORD, P AMENDT, P AF CUDDEFORD, P AMENDT, P TI EXTENDED STELLAR HYDRODYNAMICS FOR GALACTIC DISKS .2. SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article ID AXISYMMETRIC GALAXY MODELS; SURFACE MASS DENSITY; ON SPIRAL GALAXIES; SCALE-FREE MODELS; 3-DIMENSIONAL DISTRIBUTION; ELLIPTICAL GALAXIES; DISKS; KINEMATICS; ORBITS; LIGHT AB A higher-moment 3D model for axisymmetric three-integral disc galaxies is re-examined examined and modified slightly in order to take proper account of the possibly non-ellipsoidal character of the velocity distribution. General recurrence relations are found, relating certain successive even moments of arbitrary order, which are seen as generalizations of the original closure assumptions. Therefore the closure assumptions can be taken at any moment order, since the model equations generated by the generalized closure relations are valid at all levels of the infinite hierarchy of moment equations. By virtue of the formal equivalence between the infinite set of moments and the distribution function, this strongly suggests that the distribution function which underlies the model is a solution of the collisionless Boltzmann equation within the approximations of the model. The physical significance of the model is seen as attributing all of the vertical non-isothermality to the third isolating integral, and none to the deviations of the vertical and vertical-radial kurtoses from their Maxwellian values. It is argued that such a model is also appropriate for comparison with observations. The simple 'model-free' analytic expression derived in the previous paper (valid for all kinds of potential) for the orientation of the velocity ellipsoid at points near the plane is shown to yield the correct orientation exactly for any system in which the potential is Stackel separable in general spheroidal coordinates. A possible functional form for the distribution function corresponding to the model is also discussed. C1 OSSERV ASTRON TRIESTE,I-34131 TRIESTE,ITALY. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CUDDEFORD, P (reprint author), SISSA,STR COSTIERA 11,I-34014 TRIESTE,ITALY. NR 67 TC 18 Z9 19 U1 1 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD DEC 1 PY 1991 VL 253 IS 3 BP 427 EP 444 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GT569 UT WOS:A1991GT56900006 ER PT J AU ROBERTO, J AF ROBERTO, J TI THE STATE OF THE SOCIETY SO MRS BULLETIN LA English DT Editorial Material RP ROBERTO, J (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD DEC PY 1991 VL 16 IS 12 BP 4 EP 4 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA GV589 UT WOS:A1991GV58900001 ER PT J AU SHI, DG AF SHI, DG TI PROPERTIES AND DEFECTS OF TYPE-II SUPERCONDUCTORS SO MRS BULLETIN LA English DT Article ID CU-O SYSTEM; YBA2CU3O7-DELTA SINGLE-CRYSTALS; HIGH-TC SUPERCONDUCTORS; METAL-OXIDE GLASSES; OXYGEN-DEFICIENT; FLUX CREEP; PHASE; BA1-XKXBIO3-Y; LA2CUO4+DELTA; PEROVSKITE RP SHI, DG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 83 TC 3 Z9 3 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD DEC PY 1991 VL 16 IS 12 BP 37 EP 41 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA GV589 UT WOS:A1991GV58900008 ER PT J AU MCFEE, AF AF MCFEE, AF TI CHROMOSOMAL EFFECTS OF THEOPHYLLINE MEASURED IN MOUSE MARROW-CELLS INVIVO SO MUTATION RESEARCH LA English DT Article DE THEOPHYLLINE; GENOTOXICITY ID HUMAN LYMPHOCYTES; MAMMALIAN-CELLS; SISTER; METHYLXANTHINES; THEOBROMINE; CAFFEINE; RATS AB Doses of 62.5, 125 and 250 mg/kg of theophylline were administered to male B6C3F1 mice by intraperitoneal injection. Chromosome abberations were scored in first-division metaphases of marrow cells 18 and 36 h post-treatment and sister-chromatid exchanges were quantified in second-division metaphases at 24 h. A modest but statistically significant increase in the number of SCEs occurred, but chromosome aberrations were not significantly different from controls following treatment with any level of the drug at either time period. RP MCFEE, AF (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,POB 117,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [Y01-ES-20100] NR 20 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD DEC PY 1991 VL 264 IS 4 BP 219 EP 224 DI 10.1016/0165-7992(91)90082-F PG 6 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA GW944 UT WOS:A1991GW94400012 PM 1723503 ER PT J AU ZWEBEN, SJ BOIVIN, RL CHANG, CS HAMMETT, GW MYNICK, HE AF ZWEBEN, SJ BOIVIN, RL CHANG, CS HAMMETT, GW MYNICK, HE TI RADIAL DIFFUSION-COEFFICIENT FOR COUNTER-PASSING MEV IONS IN THE TFTR TOKAMAK SO NUCLEAR FUSION LA English DT Article ID ALPHA-PARTICLE CONFINEMENT; TRANSPORT; PERTURBATIONS; PLASMAS AB The radial diffusion coefficient for confined counter-passing MeV ions is evaluated in a new way, using measurements of escaping D-D fusion products. A class of passing ions near the plasma centre is measured whose orbits could eventually diffuse across their passing/trapped boundary, resulting in unconfined trapped orbits which can be detected at the plasma wall. The analysis indicates that the passing MeV ion diffusion coefficient D is smaller than almost-equal-to 0.1 m2/s, which is small compared to the thermal diffusivities of almost-equal-to 1 m2/s for these plasmas. The same experiment and analysis should be applicable to alpha particles in D-T plasmas. RP ZWEBEN, SJ (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Hammett, Gregory/D-1365-2011 OI Hammett, Gregory/0000-0003-1495-6647 NR 33 TC 44 Z9 44 U1 1 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 DEC PY 1991 VL 31 IS 12 BP 2219 EP 2245 DI 10.1088/0029-5515/31/12/001 PG 27 WC Physics, Fluids & Plasmas SC Physics GA HC234 UT WOS:A1991HC23400001 ER PT J AU PAINTER, SL LYON, JF AF PAINTER, SL LYON, JF TI TRANSPORT ANALYSIS OF STELLARATOR REACTORS SO NUCLEAR FUSION LA English DT Article ID COMPACT TORSATRON REACTORS; ADVANCED TOROIDAL FACILITY; CONCEPTUAL DESIGN; ASPECT-RATIO; ENERGY CONFINEMENT; RECENT PROGRESS; PERFORMANCE; REGIME; FIELD; MODEL AB The performance of deuterium-tritium stellarator reactors is studied with a new, fast, one-dimensional (1-D) transport survey code that is based on the spectral collocation method. Two operating modes with different signs of the assumed radial electric field are identified. The operating mode with a positive electric field is characterized by high temperatures and moderate densities, whereas the other mode has lower temperatures and higher densities. Both modes can be applied in possible reactors that can tolerate a large alpha particle energy loss. The sensitivity to device parameters and profile assumptions is examined. Scaling expressions useful for parametric studies are obtained for different quantities of interest, and the 1-D code results are compared with results derived from an empirical scaling relation. Deuterium-helium-3 operation is also feasible but is more demanding. The implications for stellarator reactor design optimization are discussed. C1 UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830. RI Painter, Scott/C-2586-2016 OI Painter, Scott/0000-0002-0901-6987 NR 54 TC 9 Z9 9 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1991 VL 31 IS 12 BP 2271 EP 2290 DI 10.1088/0029-5515/31/12/003 PG 20 WC Physics, Fluids & Plasmas SC Physics GA HC234 UT WOS:A1991HC23400003 ER PT J AU LEUTERER, F SOLDNER, FX MCCORMICK, K STEUER, KH BARTIROMO, R PERICOLIRIDOLFINI, V TUCCILLO, AA BERNABEI, S AF LEUTERER, F SOLDNER, FX MCCORMICK, K STEUER, KH BARTIROMO, R PERICOLIRIDOLFINI, V TUCCILLO, AA BERNABEI, S TI EFFICIENCY OF LOWER HYBRID CURRENT DRIVE AT 2.45 GHZ IN ASDEX SO NUCLEAR FUSION LA English DT Article ID TOKAMAK; PLASMAS; WAVES AB The experimental lower hybrid current drive efficiency at zero electric field is found to agree with theory if the spectrum of the lower hybrid waves is fully accessible to the central region of the plasma. For broad or very low parallel wave number spectra, N(parallel-to), for which the plane wave accessibility condition is not fully satisfied, the observed efficiency is higher than predicted. At non-zero electric field, the measurements agree with theories for an electric field dependent efficiency. The model can also be applied to experiments in which a symmetric spectrum of waves is launched, or to cases where the current is driven opposite to the DC electric field if runaway electrons can be neglected. A shift of the deposition zone by superposition of a low N(parallel-to) current drive spectrum and a high N(parallel-to) symmetric spectrum does not change the current drive efficiency. C1 CTR RIC ENERGIA FRASCATI, ASSOC EURATOM, ENEA, ROME, ITALY. PRINCETON UNIV, PLASMA PHYS LAB, PRINCETON, NJ 08544 USA. RP MAX PLANCK INST PLASMA PHYS, EURATOM IPP ASSOC, W-8046 GARCHING, GERMANY. NR 36 TC 39 Z9 41 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0029-5515 EI 1741-4326 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1991 VL 31 IS 12 BP 2315 EP 2331 DI 10.1088/0029-5515/31/12/006 PG 17 WC Physics, Fluids & Plasmas SC Physics GA HC234 UT WOS:A1991HC23400006 ER PT J AU REWOLDT, G AF REWOLDT, G TI COMPARISON OF HIGH-N INSTABILITIES INCLUDING ALPHA-PARTICLE EFFECTS IN BPX AND TFTR SO NUCLEAR FUSION LA English DT Article ID BALLOONING MODES; TOKAMAKS; POPULATIONS; TRANSPORT AB Three distinct types of high toroidal mode number instabilities are obtained from a comprehensive kinetic calculation, using as input transport code results from the analysis of a recent design for the Burning Plasma Experiment (BPX). These instabilities are: the collisionless trapped electron-ion temperature gradient mode, the magnetohydrodynamic ballooning mode, and a high toroidal mode number version of the 'toroidicity induced Alfven eigenmode' or 'gap' mode. The dependence of the instability linear eigenfrequencies on minor radius, beta and toroidal mode number is investigated, together with the effects of hot alpha particles. Relative quasi-linear fluxes of particles and energy for each species are also obtained. In addition, the beta dependence of the magnetohydrodynamic ballooning mode is investigated for a case using as input the results of a transport code calculation for the Tokamak Fusion Test Reactor (TFTR) in an extrapolation to a deuterium-tritium mixture. The effects of alpha particles and the relative quasi-linear fluxes are also investigated for this case. RP REWOLDT, G (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 23 TC 8 Z9 8 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1991 VL 31 IS 12 BP 2333 EP 2348 DI 10.1088/0029-5515/31/12/007 PG 16 WC Physics, Fluids & Plasmas SC Physics GA HC234 UT WOS:A1991HC23400007 ER PT J AU TSUI, HYW RITZ, CP MILLER, G INGRAHAM, JC MUNSON, CP SCHOENBERG, KF WEBER, PG AF TSUI, HYW RITZ, CP MILLER, G INGRAHAM, JC MUNSON, CP SCHOENBERG, KF WEBER, PG TI FLUCTUATIONS AND TRANSPORT IN A REVERSED FIELD PINCH EDGE PLASMA SO NUCLEAR FUSION LA English DT Article ID ANOMALOUS TRANSPORT; LOOP VOLTAGE; TURBULENCE; TOKAMAKS; CONFINEMENT; LIMITERS AB Edge fluctuations are characterized and their associated transport is determined from Langmuir probe measurements in the ZT-40M reversed field pinch. It is found that the fluctuations have high normalized amplitudes (e\phi(f)\/T(e) = 1.1, \T(e)\/T(e) = 0.5 and \n\/n = 0.4). There are significant contributions from magnetic perturbations acting on the equilibrium gradients. Compared to the global estimates, the fluctuation driven particle flux is large, whereas the corresponding electron energy flux is not. In the limiter shadow, the equilibrium density and electron temperature scale lengths are shorter and the fluctuation levels are higher. The fluctuation driven particle flux in the limiter shadow is 60% less than that in the plasma edge, most of the reduction is in the low frequency spectral region, which is where global MHD magnetic fluctuations are strongest. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP TSUI, HYW (reprint author), UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712, USA. NR 31 TC 27 Z9 27 U1 0 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 DEC PY 1991 VL 31 IS 12 BP 2371 EP 2382 DI 10.1088/0029-5515/31/12/009 PG 12 WC Physics, Fluids & Plasmas SC Physics GA HC234 UT WOS:A1991HC23400009 ER PT J AU DREWERY, JS CHO, G FUJIEDA, I JING, T KAPLAN, SN PEREZMENDEZ, V WILDERMUTH, D STREET, RA AF DREWERY, JS CHO, G FUJIEDA, I JING, T KAPLAN, SN PEREZMENDEZ, V WILDERMUTH, D STREET, RA TI AMORPHOUS-SILICON PIXEL ARRAYS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2ND LONDON CONF ON POSITION-SENSITVE DETECTORS CY SEP 04-07, 1990 CL IMPERIAL COLL, LONDON, ENGLAND SP INST PHYS, HIGH ENERGY PARTICLE PHYS GRP, INST PHYS, NUCL PHYS DIV, ICFA INSTRUMENTAT PANEL, ENRAF NONIUS UK HO IMPERIAL COLL AB Amorphous silicon pin diodes can detect minimum ionizing particles either by direct electron-hole pair generation or when used as photodiodes in conjunction with a scintillator material. We summarize recent results on such detectors and describe progress towards fabrication of pixel arrays. C1 XEROX CORP,PALO ALTO RES CTR,PALO ALTO,CA 94304. RP DREWERY, JS (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720, USA. RI Cho, Gyuseong/C-1527-2011 NR 14 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1991 VL 310 IS 1-2 BP 165 EP 170 DI 10.1016/0168-9002(91)91018-Q PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT530 UT WOS:A1991GT53000027 ER PT J AU BENCIVELLI, W BERTOLUCCI, E BOTTIGLI, U DELGUERRA, A MESSINEO, A NELSON, WR RANDACCIO, P ROSSO, V RUSSO, P STEFANINI, A AF BENCIVELLI, W BERTOLUCCI, E BOTTIGLI, U DELGUERRA, A MESSINEO, A NELSON, WR RANDACCIO, P ROSSO, V RUSSO, P STEFANINI, A TI EVALUATION OF ELEMENTAL AND COMPOUND SEMICONDUCTORS FOR X-RAY DIGITAL RADIOGRAPHY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2ND LONDON CONF ON POSITION-SENSITVE DETECTORS CY SEP 04-07, 1990 CL IMPERIAL COLL, LONDON, ENGLAND SP INST PHYS, HIGH ENERGY PARTICLE PHYS GRP, INST PHYS, NUCL PHYS DIV, ICFA INSTRUMENTAT PANEL, ENRAF NONIUS UK HO IMPERIAL COLL ID RADIATION DETECTORS; CADMIUM TELLURIDE; STRUCTURAL DEFECTS; GAMMA AB We present a comparative study of the performance of elemental and compound solid state crystals of possible use in X-ray digital radiography. The general purpose EGS4 code was used to simulate photon-electron transport in the energy range 20 to 60 keV. The efficiency and the energy resolution, as a function of X-ray energy, are calculated and correlated to the different physical characteristics of the crystals considered. C1 IST NAZL FIS NUCL,PISA,ITALY. UNIV PISA,DIPARTMENTO FIS,I-56100 PISA,ITALY. UNIV CAGLIARI,IST FIS,I-09100 CAGLIARI,ITALY. NAPLES UNIV,DIPARTIMENTO SCI FISICHE,I-80138 NAPLES,ITALY. SLAC,STANFORD,CA 94309. RP BENCIVELLI, W (reprint author), UNIV PISA,IST PATOL SPECIALE MED & METODOL CLIN,I-56100 PISA,ITALY. RI bencivelli, walter/H-1898-2012; OI Bottigli, Ubaldo/0000-0002-0666-3433; Russo, Paolo/0000-0001-9409-0008 NR 18 TC 31 Z9 31 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1991 VL 310 IS 1-2 BP 210 EP 214 DI 10.1016/0168-9002(91)91028-T PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT530 UT WOS:A1991GT53000037 ER PT J AU HYLEN, J MATTHEWS, J WEINSTEIN, A HUBBARD, B OSHAUGHNESSY, K PITZL, D SEIDEN, A MILLER, W THOMPSON, T GAMBLE, M BAKER, C DRANSFIELD, G ZIOCK, H REID, R WOLOSHUN, K BRADLEY, J AF HYLEN, J MATTHEWS, J WEINSTEIN, A HUBBARD, B OSHAUGHNESSY, K PITZL, D SEIDEN, A MILLER, W THOMPSON, T GAMBLE, M BAKER, C DRANSFIELD, G ZIOCK, H REID, R WOLOSHUN, K BRADLEY, J TI SILICON TRACKER FOR THE SUPERCONDUCTING SUPERCOLLIDER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2ND LONDON CONF ON POSITION-SENSITVE DETECTORS CY SEP 04-07, 1990 CL IMPERIAL COLL, LONDON, ENGLAND SP INST PHYS, HIGH ENERGY PARTICLE PHYS GRP, INST PHYS, NUCL PHYS DIV, ICFA INSTRUMENTAT PANEL, ENRAF NONIUS UK HO IMPERIAL COLL AB This is a status report on the design of a large silicon tracking detector for the superconducting supercollider (SSC). We present our design, the principles on which it is based and initial work on the mechanical support structure for the detectors. C1 CALTECH,PASADENA,CA 91125. UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP HYLEN, J (reprint author), JOHNS HOPKINS UNIV,BALTIMORE,MD 21218, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1991 VL 310 IS 1-2 BP 497 EP 503 DI 10.1016/0168-9002(91)91088-D PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT530 UT WOS:A1991GT53000097 ER PT J AU BACKENSTOSS, G BREUER, H DOBBELING, H FURIC, M GRAM, PA HOFFART, A INGRAM, CHQ KLEIN, A KOTLINSKI, B KYLE, GS MICHAELIAN, K MUKHOPADYAY, S PETKOVIC, T REDWINE, RP ROWNTREE, D SCHUMACHER, RA SENNHAUSER, U SIMICEVIC, N SMIT, FD VANDERSTEENHOVEN, G TIEGER, DR ULLRICH, H WANG, MH WEYER, HJ WILDI, M WILSON, KE AF BACKENSTOSS, G BREUER, H DOBBELING, H FURIC, M GRAM, PA HOFFART, A INGRAM, CHQ KLEIN, A KOTLINSKI, B KYLE, GS MICHAELIAN, K MUKHOPADYAY, S PETKOVIC, T REDWINE, RP ROWNTREE, D SCHUMACHER, RA SENNHAUSER, U SIMICEVIC, N SMIT, FD VANDERSTEENHOVEN, G TIEGER, DR ULLRICH, H WANG, MH WEYER, HJ WILDI, M WILSON, KE TI LADS - LARGE ACCEPTANCE DETECTOR SYSTEM FOR PION NUCLEUS REACTIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2ND LONDON CONF ON POSITION-SENSITVE DETECTORS CY SEP 04-07, 1990 CL IMPERIAL COLL, LONDON, ENGLAND SP INST PHYS, HIGH ENERGY PARTICLE PHYS GRP, INST PHYS, NUCL PHYS DIV, ICFA INSTRUMENTAT PANEL, ENRAF NONIUS UK HO IMPERIAL COLL ID ABSORPTION AB A large acceptance detector system (LADS) has been designed and built at the Paul Scherrer Institute to study multi-particle final states after pion-nucleus absorption. It consists of a 28-sector cylinder of plastic scintillator of 1.6 m active length and 1.5 m diameter, and two cylindrical wire chambers; two 14-sector endcaps of plastic scintillator close each end. C1 CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE,GERMANY. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV MARYLAND,COLLEGE PK,MD 20742. MIT,BATES LINEAR ACCELERATOR CTR,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. NATL ACCELERATOR CTR,FAURE 7131,SOUTH AFRICA. NEW MEXICO STATE UNIV,DEPT PHYS,LAS CRUCES,NM 88003. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. UNIV ZAGREB,FAC PHYS,YU-41001 ZAGREB,YUGOSLAVIA. UNIV ZAGREB,FAC ELECT ENGN,YU-41001 ZAGREB,YUGOSLAVIA. RP BACKENSTOSS, G (reprint author), UNIV BASEL,INST PHYS,CH-4051 BASEL,SWITZERLAND. RI Schumacher, Reinhard/K-6455-2013 OI Schumacher, Reinhard/0000-0002-3860-1827 NR 2 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1991 VL 310 IS 1-2 BP 518 EP 522 DI 10.1016/0168-9002(91)91092-A PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT530 UT WOS:A1991GT53000101 ER PT J AU GALUSKA, AA AF GALUSKA, AA TI ION-INDUCED NI FERRITE ADHESION ENHANCEMENT SI-28(+) VERSUS AR-40(+) ION MIXING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; FILMS; IMPLANTATION; OXIDE; BOMBARDMENT; SURFACES; CORE; IRON; ESCA AB The adhesion between 30 nm Ni films and ferrite substrates was examined as a function of the interfacial chemistry and mixing induced by low temperature Ar-40+ and Si-28+ ion mixing. The temperature of the Ni/ferrite specimens was kept between 50 and 100-degrees-C while the specimens were implanted with either 65 keV Ar-40+ or 50 keV Si-28+. The doses of both types of implants were varied between 1 and 10 x 10(16) atom/cm2. The interfacial mixing, interfacial chemistry and the Ni adhesion produced by the ion mixing processes was evaluated using XPS depth profiling, high resolution XPS and scratch testing, respectively. Both types of implants were observed to induce substantial interfacial grading, although this grading was greater for the Ar-40+ than the Si-28+ ion mixing. XPS analyses suggested that Ni-O-M (where M is either Fe, Mn, or Zn) interfacial complexes were present in the as-deposited specimens, and that they were responsible for the relatively good adhesion (8 N) of the as-deposited films. These intrinsic interfacial complexes were destroyed by both the Ar-40+ and the Si-28+ ion mixing. In the case of Ar-40+ ion mixing, no new interfacial complexes were produced. This resulted in the reduction of Ni/ferrite adhesion (to a critical force of 2 N). In the case of Si-28+ ion mixing, new interfacial chemistry (Ni-Si, Fe-Si, and Si-O) was produced, suggesting the formation of adhesive interfacial complexes (such as Ni-Si-Fe-O and Ni-Si-O-Fe). This new interfacial chemistry resulted in significant adhesion enhancements (up to 26 N). RP GALUSKA, AA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Dom, Rekha/B-7113-2012 NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1991 VL 62 IS 2 BP 191 EP 200 DI 10.1016/0168-583X(91)95898-N PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GY415 UT WOS:A1991GY41500002 ER PT J AU CARLSON, GA FEHL, DL LORENCE, LJ AF CARLSON, GA FEHL, DL LORENCE, LJ TI A DIFFERENTIAL ABSORPTION SPECTROMETER FOR DETERMINING FLASH X-RAY-SPECTRA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID PREDICTIONS; DETECTORS; CODE AB Three models of a differential absorption spectrometer have been developed for determining the photon spectra of bremsstrahlung sources whose endpoints vary from approximately 150 to 2000 keV. Spectral data are unfolded from dose-depth measurements using an iterative technique, with spectral response functions generated by a radiation transport code (CEPXS/ONETRAN). Unfolded spectra from quasi-monoenergetic photon sources from 17 to 1250 keV, and from a well-characterized continuous bremsstrahlung source at endpoint energies from 150 to 900 keV, were in good agreement with the known or calculated spectra. The use of the DAS to estimate the spectra from flash X-ray sources is demonstrated. The effects of systematic and random errors on unfolded spectra are evaluated. RP CARLSON, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1991 VL 62 IS 2 BP 264 EP 274 DI 10.1016/0168-583X(91)95910-6 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GY415 UT WOS:A1991GY41500014 ER PT J AU ADAMS, JP MCCREERY, GE KIM, JH AF ADAMS, JP MCCREERY, GE KIM, JH TI MONITORING PRESSURIZED WATER-REACTOR TRANSIENTS USING REACTOR COOLANT PUMPS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB An alternate pump trip criterion is described that meets the intent of the U.S. Nuclear Regulatory Commission pump trip requirement [i.e., to minimize primary system mass loss during a small-break loss-of-coolant accident (SBLOCA)] while providing the operators with a valuable tool to differentiate between various generic types of off-nominal transient conditions (heatup, cooldown, and loss-of-coolant accident) and to determine the efficacy of the recovery from these transients. The technique also provides a reliable measure of primary system mass inventory during heatup and cooldown transients and in the early phases of an SBLOCA. This method was developed by examining pump response to a variety of transients conducted in the Loss-of-Flow Test (LOFT) Facility. To explain the data, a mathematical model was developed based on one-dimensional pump theory. The response of the LOFT pumps was extended to full-scale commercial pressurized water reactor (PWR) pump response by examining general centrifugal pump behavior and by calculating PWR response to an SBLOCA. The results of the study indicate that the PWR pump behavior can be expected to be similar to that measured in LOFT and that the pump model can be used to gain valuable information on the status of a PWR during off-nominal transient conditions. C1 ELECT POWER RES INST,PALO ALTO,CA 94304. RP ADAMS, JP (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 35 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD DEC PY 1991 VL 109 IS 4 BP 325 EP 340 PG 16 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR789 UT WOS:A1991GR78900001 ER PT J AU DANON, Y SLOVACEK, RE BLOCK, RC LOUGHEED, RW HOFF, RW MOORE, MS AF DANON, Y SLOVACEK, RE BLOCK, RC LOUGHEED, RW HOFF, RW MOORE, MS TI FISSION CROSS-SECTION MEASUREMENTS OF CM-247, ES-254, AND CF-250 FROM 0.1 EV TO 80 KEV SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB The fission cross sections of Cm-247, Es-254, and Cf-250 are measured with the Rensselaer intense neutron spectrometer from 0.1 eV to 80 keV. The cross sections are normalized to the U-235 ENDF/B-V broadened cross section. Fission areas and resonance widths are determined for low-energy resonances in Cm-247. The Es-254 and Cf-250 fission cross sections are the only reported measurements for these isotopes. The Es-254 isotope is the heaviest odd-odd isotope ever measured over this energy range. The thermal fission cross sections for Cm-247, Es-254, and Cf-250 are determined by extrapolation of the low-energy region of the cross section and are in good agreement with other reported measurements. Resonance integrals are reported for the energy range of 0.1 eV to 80 keV, and the areas for Cm-247 and Cf-250 resonances are also reported. The previously reported Cm-246 fission cross section was corrected for fission in Cm-247. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87451. RP DANON, Y (reprint author), RENSSELAER POLYTECH INST,DEPT NUCL ENGN & ENGN PHYS,GAERTTNER LINAC LAB,TROY,NY 12180, USA. RI Danon, Yaron/B-5159-2009 NR 21 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 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD DEC PY 1991 VL 109 IS 4 BP 341 EP 349 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR789 UT WOS:A1991GR78900002 ER PT J AU HAYASHI, M NISHIGORI, T ALSMILLER, RG LILLIE, RA AF HAYASHI, M NISHIGORI, T ALSMILLER, RG LILLIE, RA TI CALCULATED ENERGY AND ANGULAR-DEPENDENCE OF PARTICLE FLUXES AT THE EXIT OF THE ADVANCED NEUTRON SOURCE RADIAL AND TANGENTIAL BEAM TUBES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Calculational studies are conducted of neutron and gamma-ray transport in the beam tubes of a proposed high-flux reactor for the Advanced Neutron Source. To avoid excessively long computing times, the calculations were carried out by coupling two, two-dimensional discrete ordinates calculations. The calculational methodology used is briefly described. Calculated results are presented of the thermal neutron, nonthermal neutron, and gamma-ray fluxes in a radial and a tangential beam tube. Both scalar and angular fluxes in and at the exit of the beam tubes are given. When compared with the radial beam tube, the tangential beam tube shows a lower flux of high-energy neutrons and a much lower flux of gamma rays. The spectral characteristics of the particle fluxes at the exits of the beam tubes are similar to those at the entrances. C1 OSAKA UNIV,DEPT NUCL ENGN,SUITA,OSAKA 565,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP HAYASHI, M (reprint author), KYOTO UNIV,INST RES REACTOR,KUMATORI CHO,OSAKA 59004,JAPAN. NR 14 TC 2 Z9 2 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD DEC PY 1991 VL 109 IS 4 BP 391 EP 400 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR789 UT WOS:A1991GR78900007 ER PT J AU TORCZYNSKI, JR AF TORCZYNSKI, JR TI HEATING-INDUCED DAMPING OF DENSITY PERTURBATIONS IN NUCLEAR-REACTOR-PUMPED LASERS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID MIXTURES; MOTION AB A previously reported analytical model describing gas motion in nuclear-reactor-pumped lasers is extended to incorporate spatially nonuniform initial gas density fields. This model is solved analytically, and the solution is used to study the damping of density perturbations in the gas induced by fission-fragment heating. An approximate scaling relation is found that describes the reduction in the root-mean-square density perturbation in terms of the heating-induced pressure rise normalized by the initial pressure. This damping process is shown to be relatively independent of the spatial frequency of the initial density perturbation field. RP TORCZYNSKI, JR (reprint author), SANDIA NATL LABS,DEPT FLUID THERMAL & STRUCT SCI,ALBUQUERQUE,NM 87185, USA. NR 29 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD DEC PY 1991 VL 109 IS 4 BP 401 EP 410 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR789 UT WOS:A1991GR78900008 ER PT J AU VO, TV HEASLER, PG DOCTOR, SR SIMONEN, FA GORE, BF AF VO, TV HEASLER, PG DOCTOR, SR SIMONEN, FA GORE, BF TI ESTIMATES OF RUPTURE PROBABILITIES FOR NUCLEAR-POWER-PLANT COMPONENTS - EXPERT JUDGMENT ELICITATION SO NUCLEAR TECHNOLOGY LA English DT Article DE ELICITATION; COMPONENT; PROBABILITY ID IN-SERVICE INSPECTION AB As part of the nondestructive evaluation reliability program sponsored by the U.S. Nuclear Regulatory Commission (NRC), Pacific Northwest Laboratory (PNL) developed a risk-based method for establishing inspection priorities for systems and components at nuclear power plants. In this method, the results of probabilistic risk assessment (PRA) are used to estimate the safety consequences of component failures. The method also requires estimates of the probabilities of structural failures. Since sufficient operating experience data and detailed fracture mechanics analyses are not available, an expert judgment elicitation is conducted to estimate component rupture probabilities. (An expert judgment process is generally adapted from the NRC severe accident risk program.) The plant selected for the detailed evaluation is the Surry nuclear power station Unit 1 (Surry-1). Systems selected for analysis are the reactor pressure vessel, the reactor coolant, the low-pressure injection including the accumulators, and the auxiliary feedwater. Additional technical information is gathered regarding the elicited issues. The data appear to be reasonable, and they generally agree with and reflect Surry-1 plant operating experience. Typical areas of concern correspond to such factors as high stresses (e.g., places where mixing of fluids with large temperature differences occurs) and places where erosion or corrosion effects are active. These results will be used by PNL in an ongoing pilot study based on the PRA results and other relevant information in determining the inspection priorities for systems and components at the Surry power plant. RP VO, TV (reprint author), PACIFIC NW LAB, CTR REACTOR TECHNOL, RICHLAND, WA 99352 USA. NR 5 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 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD DEC PY 1991 VL 96 IS 3 BP 259 EP 271 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GR210 UT WOS:A1991GR21000003 ER PT J AU JANKOWSKI, AF MAKOWIECKI, DM AF JANKOWSKI, AF MAKOWIECKI, DM TI W/B4C MULTILAYER X-RAY MIRRORS SO OPTICAL ENGINEERING LA English DT Article DE X-RAYS; MIRRORS; REFLECTIVITY; OPTICAL FABRICATION ID W/C; RESOLUTION AB One of the most important considerations in the design and manufacture of multilayer mirrors is material compatibility. Ideally, the materials selected should not chemically react or interdiffuse, thereby avoiding the formation of second phases, thus enhancing the smoothness of the layer interfaces and the reflectivity of the optic. The transparency of the spacing layers can therefore be augmented by materials of low absorption. Initial findings with B4C layers indicate deposits that show smoother layering than those containing carbon, with the advantages of greater stability, lower absorption, and therefore greater reflectivity. The manufacture, microstructure, and reflectivity of W/B4C multilayers are discussed. RP JANKOWSKI, AF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,DIV MAT,LIVERMORE,CA 94550, USA. NR 21 TC 10 Z9 11 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD DEC PY 1991 VL 30 IS 12 BP 2003 EP 2009 DI 10.1117/12.56018 PG 7 WC Optics SC Optics GA GV104 UT WOS:A1991GV10400025 ER PT J AU BENICEWICZ, PK ROBERTS, JP TAYLOR, AJ AF BENICEWICZ, PK ROBERTS, JP TAYLOR, AJ TI THE ABSORPTION CHARACTERISTICS AND RECOVERY DYNAMICS OF THE TRICARBOCYANINE DYE DTP SO OPTICS COMMUNICATIONS LA English DT Article ID PULSES; 800-NM AB The absorption recovery characteristics of the tricarbocyanine dye DTP dissolved in propylene carbonate and ethylene glycol are described. DTP has a peak absorption cross section of 1 x 10(-15) cm2 at 824 nm. The induced absorption recovers to 50% of its initial value in 31 +/- 10 ps. C1 UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131. RP BENICEWICZ, PK (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LASER & OPT SCI GRP,CLS-5,MS E543,LOS ALAMOS,NM 87545, USA. NR 11 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD DEC 1 PY 1991 VL 86 IS 5 BP 393 EP 396 DI 10.1016/0030-4018(91)90501-4 PG 4 WC Optics SC Optics GA GV883 UT WOS:A1991GV88300006 ER PT J AU COURTRIGHT, EL PRATER, JT HOLCOMB, GR STPIERRE, GR RAPP, RA AF COURTRIGHT, EL PRATER, JT HOLCOMB, GR STPIERRE, GR RAPP, RA TI OXIDATION OF HAFNIUM CARBIDE AND HAFNIUM CARBIDE WITH ADDITIONS OF TANTALUM AND PRASEODYMIUM SO OXIDATION OF METALS LA English DT Article DE HAFNIUM CARBIDE; CARBON-CARBON COMPOSITES; OXIDATION RESISTANCE; HIGH TEMPERATURE AB The oxidation behavior of HfC, HfC-25 wt.% TaC, and HfC-7 wt.% PrC2 has been studied between 1200-2200-degrees-C. Parabolic growth of the oxide layer has been observed for both HfC and HfC-TaC over the entire temperature range. A break in the temperature dependence of the oxidation kinetics occurs around 1600-degrees-C. At lower temperatures, the kinetics are limited by gaseous diffusion via pores in the oxide. Above 1800-degrees-C, gaseous diffusion through pores becomes less important as scale-growth kinetics are dominated by bulk (ambipolar) diffusion of oxygen and electrons through the oxide. C1 OHIO STATE UNIV, COLUMBUS, OH 43210 USA. RP COURTRIGHT, EL (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Holcomb, Gordon/G-9070-2013 OI Holcomb, Gordon/0000-0003-3542-5319 NR 9 TC 33 Z9 41 U1 3 U2 25 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0030-770X J9 OXID MET JI Oxid. Met. PD DEC PY 1991 VL 36 IS 5-6 BP 423 EP 437 DI 10.1007/BF01151590 PG 15 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA GT558 UT WOS:A1991GT55800005 ER PT J AU SUN, XH GUSTAFSON, JL AF SUN, XH GUSTAFSON, JL TI TOWARD A BETTER PARALLEL PERFORMANCE METRIC SO PARALLEL COMPUTING LA English DT Article DE PARALLEL PROCESSING; PERFORMANCE MEASUREMENT; PARALLEL SPEEDUP; SCALED SPEEDUP; SIZEUP ID LAW AB The traditional definition of 'speedup' as the ratio of sequential execution time to parallel execution time has been widely accepted. One drawback to this metric is that it tends to reward slower processors and inefficient compilation with higher speedup. It seems unfair that the goals of high speed and high speedup are at odds with each other. In this paper, the 'fairness' of parallel performance metrics is studied. Theoretical and experimental results show that the most commonly used performance metric, parallel speedup, is 'unfair', in that it favors slow processors and poorly coded programs. Two new performance metrics are introduced. The first one, sizeup, provides a 'fair' performance measurement. The second one is a generalization of speedup - the generalized speedup, which recognizes that speedup is the ratio of speeds, not times. The relation between sizeup, speedup, and generalized speedup are studied. The various metrics have been tested using a real application that runs on an nCUBE 2 multicomputer. The experimental results closely match the analytical results. RP SUN, XH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 22 TC 52 Z9 58 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD DEC PY 1991 VL 17 IS 10-11 BP 1093 EP 1109 DI 10.1016/S0167-8191(05)80028-6 PG 17 WC Computer Science, Theory & Methods SC Computer Science GA GV340 UT WOS:A1991GV34000003 ER PT J AU LEVINE, D CALLAHAN, D DONGARRA, J AF LEVINE, D CALLAHAN, D DONGARRA, J TI A COMPARATIVE-STUDY OF AUTOMATIC VECTORIZING COMPILERS SO PARALLEL COMPUTING LA English DT Article DE FORTRAN LOOPS; AUTOMATIC VECTORIZING COMPILERS; SPEEDUP; RESULT ANALYSIS; COMPILER PERFORMANCE MODEL AB We compare the capabilities of several commercially available, vectorizing Fortran compilers using a test suite of Fortran loops. We present the results of compiling and executing these loops on a variety of supercomputers, mini-supercomputers, and mainframes. C1 TERA COMP,SEATTLE,WA 98103. UNIV TENNESSEE,DEPT COMP SCI,KNOXVILLE,TN 37996. RP LEVINE, D (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. RI Dongarra, Jack/E-3987-2014 NR 15 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD DEC PY 1991 VL 17 IS 10-11 BP 1223 EP 1244 DI 10.1016/S0167-8191(05)80035-3 PG 22 WC Computer Science, Theory & Methods SC Computer Science GA GV340 UT WOS:A1991GV34000010 ER PT J AU DONGARRA, J FURTNEY, M REINHARDT, S RUSSELL, J AF DONGARRA, J FURTNEY, M REINHARDT, S RUSSELL, J TI PARALLEL LOOPS - A TEST SUITE FOR PARALLELIZING COMPILERS - DESCRIPTION AND EXAMPLE RESULTS SO PARALLEL COMPUTING LA English DT Article DE MULTIPROCESSOR SYSTEMS; PARALLELIZING COMPILERS; PARALLEL TEST SUITE; RESULTS; CRAY; CONVEX AB Several multiprocessor systems are now commercially available, and advances in compiler technology provide automatic conversion of programs to run on such systems. However, no accepted measure of this parallel compiler ability exists. This paper presents a test suite of subroutines and loops, called Parallel Loops, designed to (1) measure the ability of parallelizing compilers to convert code to run in parallel and (2) determine how effectively parallel hardware and software work together to achieve high performance across a range of problem sizes. In addition, we present the results of compiling this suite using two commercially available parallelizing Fortran compilers, Cray and Convex. C1 CRAY RES INC,EAGAN,MN 55121. OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. RP DONGARRA, J (reprint author), UNIV TENNESSEE,DEPT COMP SCI,KNOXVILLE,TN 37996, USA. RI Dongarra, Jack/E-3987-2014 NR 5 TC 13 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD DEC PY 1991 VL 17 IS 10-11 BP 1247 EP 1255 DI 10.1016/S0167-8191(05)80036-5 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA GV340 UT WOS:A1991GV34000011 ER PT J AU DUNIGAN, TH AF DUNIGAN, TH TI PERFORMANCE OF THE INTEL IPSC/860 AND NCUBE 6400 HYPERCUBES SO PARALLEL COMPUTING LA English DT Article DE HYPERCUBES; INTEL IPSC/860; NCUBE 6400; PERFORMANCE RESULTS; COMPUTATION BENCHMARKS; COMMUNICATION BENCHMARKS AB The performance of the Intel iPSC/860 hypercube and the Ncube 6400 hypercube are compared with earlier hypercubes from Intel and Ncube. Computation and communication performance for a number of low-level benchmarks are presented for the Intel iPSC/1, iPSC/2, and iPSC/860 and for the Ncube 3200 and 6400. File I/O performance of the iPSC/860 and Ncube 6400 are compared. RP DUNIGAN, TH (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,MATH SCI SECT,OAK RIDGE,TN 37831, USA. NR 15 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD DEC PY 1991 VL 17 IS 10-11 BP 1285 EP 1302 DI 10.1016/S0167-8191(05)80039-0 PG 18 WC Computer Science, Theory & Methods SC Computer Science GA GV340 UT WOS:A1991GV34000014 ER PT J AU PERKINS, M AF PERKINS, M TI ALCOHOLIC EMPLOYEES LAST CHANCE SO PERSONNEL JOURNAL LA English DT Letter RP PERKINS, M (reprint author), OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACC COMMUNICATIONS INC PI COSTA MESA PA 245 FISCHER AVE, COSTA MESA, CA 92626 SN 0031-5745 J9 PERS J JI Pers. J. PD DEC PY 1991 VL 70 IS 12 BP 82 EP 82 PG 1 WC Psychology, Applied SC Psychology GA GU140 UT WOS:A1991GU14000011 ER PT J AU WANG, LM BIRTCHER, RC AF WANG, LM BIRTCHER, RC TI AMORPHIZATION, MORPHOLOGICAL INSTABILITY AND CRYSTALLIZATION OF KRYPTON ION IRRADIATED GERMANIUM SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID RADIATION-DAMAGE; AMORPHOUS ALLOY; IMPLANTATION; GE AB Krypton ion irradiation of crystalline Ge and subsequent thermal annealing were both carried out with in situ transmission electron microscopy observations. The temperature dependence of the amorphization dose, effect of foil thickness, morphological changes during continuous irradiation of the amorphous state as well as the effect of implanted gas have been determined. The dose of 1.5 MeV Kr required for amorphization increases with increasing temperature. At a fixed temperature, the amorphization dose is higher for thicker regions of the specimen. Continuous irradiation of amorphous Ge at room temperature results in a high density of small cavities which grow with increasing dose. Cavities do not coalesce during growth but develop into irregular-shaped holes that eventually transform the amorphous Ge into a sponge-like material. Formation of the spongy structure is independent of Kr implantation. The crystallization temperature and the morphology of recrystallized Ge depend on the Kr+ dose. Voids are expelled from recrystallized Ge, while the sponge-like structure is retained after crystallization. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WANG, LM (reprint author), UNIV NEW MEXICO,DEPT GEOL,ALBUQUERQUE,NM 87131, USA. NR 28 TC 67 Z9 67 U1 2 U2 11 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD DEC PY 1991 VL 64 IS 6 BP 1209 EP 1223 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA GU162 UT WOS:A1991GU16200002 ER PT J AU SHINDO, D YOO, MH HANADA, S HIRAGA, K AF SHINDO, D YOO, MH HANADA, S HIRAGA, K TI DIRECT OBSERVATION OF THE SHEAR APB INTERFACE IN FE3AL BY HREM SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID IRON-ALUMINUM ALLOYS; DISLOCATIONS; RESOLUTION AB Atomic arrangements at a nearest neighbour anti-phase boundary (APB), on the (110BAR) plane, connected by 1/2[111] superpartials in Fe3Al were directly observed in an edge-on view using high resolution electron microscopy (HREM). In HREM images, Al atom positions projected along the [110] direction were revealed as white dots. A single step on the APB interface, which is related to a jog on the partial dislocation line, was identified directly from the geometrical patterns of the white dots. Detailed comparisons of the experimental data with simulated images indicated that the apparent relaxation of atomic rows at the APB is very localized to its interface even at the step. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP SHINDO, D (reprint author), TOHOKU UNIV,INST MAT RES,KATAHIRA 2-1-1,SENDAI,MIYAGI 980,JAPAN. RI Shindo, Daisuke/I-3865-2012 NR 19 TC 9 Z9 9 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD DEC PY 1991 VL 64 IS 6 BP 1281 EP 1290 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA GU162 UT WOS:A1991GU16200007 ER PT J AU MUENCHAUSEN, RE COOKE, DW FOLTYN, SR WU, XD NOGAR, NS AF MUENCHAUSEN, RE COOKE, DW FOLTYN, SR WU, XD NOGAR, NS TI LARGE-AREA, LOW MICROWAVE SURFACE-RESISTANCE THIN-FILMS OF YBA2CU3O7-X USING PULSED LASER DEPOSITION SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON CHEMICAL DESIGNING AND PROCESSING OF HIGH-T(C) SUPERCONDUCTORS ( CHEM-HTSC ) CY JUL 27-29, 1991 CL KARUIZAWA, JAPAN SP MINIST EDUC SCI & CULTURE JAPAN, KATO SCI FDN ID TC SUPERCONDUCTING FILMS; SRTIO3 AB One- and two-inch diameter wafers of (100) LaAlO3, NdGaO3 and buffered sapphire have been coated on both sides with thin films of YBa2Cu3O7-x by the pulsed laser deposition technique. Deposition parameters have been optimized to produce uniform, 90 K films which have surface resistance values between 0.2-0.3 m-OMEGA at 4 K and 22 GHz. RP MUENCHAUSEN, RE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. NR 19 TC 12 Z9 12 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC PY 1991 VL 190 IS 1-2 BP 46 EP 49 DI 10.1016/S0921-4534(05)80193-5 PG 4 WC Physics, Applied SC Physics GA HC270 UT WOS:A1991HC27000013 ER PT J AU SCHLESINGER, Z ROTTER, LD COLLINS, RT HOLTZBERG, F FEILD, C WELP, U CRABTREE, GW LIU, JZ FANG, Y VANDERVOORT, KG AF SCHLESINGER, Z ROTTER, LD COLLINS, RT HOLTZBERG, F FEILD, C WELP, U CRABTREE, GW LIU, JZ FANG, Y VANDERVOORT, KG TI INFRARED PROPERTIES OF HIGH-TC SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID NORMAL-STATE; ENERGY-GAP; CU-O; REFLECTIVITY; CONDUCTIVITY; YBA2CU3O7; CRYSTALS; ABSORPTIVITY AB Over the past several years a coherent phenomenology of the high T(c) cuprate superconductors has begun to emerge. Infrared measurements have contributed several important ingredients to this picture including: 1) the inference of a scattering rate that is linear in frequency for omega > T, and of order omega, -- 2) a characteristic energy scale in the superconducting state of 500 cm-1 (60 meV), which can be interpreted as a superconducting pair excitation threshold or energy gap, and -- 3) evidence for very unusual temperature dependence in the vicinity of T(c). An attempt to describe these aspects of the data is presented here. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SCHLESINGER, Z (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. RI Collins, Reuben/O-2545-2014 OI Collins, Reuben/0000-0001-7910-3819 NR 35 TC 34 Z9 34 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 DEC 1 PY 1991 VL 185 BP 57 EP 64 DI 10.1016/0921-4534(91)91950-9 PN 1 PG 8 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700015 ER PT J AU SHIRANE, G AF SHIRANE, G TI MAGNETIC CORRELATIONS IN HIGH-TC OXIDES SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID NEUTRON-SCATTERING; SPIN FLUCTUATIONS; NORMAL STATE; EXCITATIONS; YBA2CU3O6+X; MODEL AB A review is given of recent neutron scattering measurements on YBa2Cu3O6+x and La2-x Sr(Ba)xCuO4 single crystals. The magnetic correlations in these high T(c) oxide systems are now well characterized over almost the entire concentration ranges. Particularly interesting properties are the appearance of a pseudo gap in superconducting 123 compositions and the omega/T dependence of the cross section in lightly doped La2CuO4. RP SHIRANE, G (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 24 TC 29 Z9 29 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 DEC 1 PY 1991 VL 185 BP 80 EP 85 DI 10.1016/0921-4534(91)91954-3 PN 1 PG 6 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700019 ER PT J AU JORGENSEN, JD HINKS, DG RADAELLI, PG PEI, SY LIGHTFOOT, P DABROWSKI, B SEGRE, CU HUNTER, BA AF JORGENSEN, JD HINKS, DG RADAELLI, PG PEI, SY LIGHTFOOT, P DABROWSKI, B SEGRE, CU HUNTER, BA TI DEFECTS, DEFECT ORDERING, STRUCTURAL COHERENCE AND SUPERCONDUCTIVITY IN THE 123-COPPER OXIDES SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID ELECTRON-DIFFRACTION; OXYGEN; YBA2CU3O7-DELTA; TEMPERATURE; PHASE; MICROSCOPY; 60-K; TC AB We discuss the influence of oxygen defects and defect ordering on superconductivity in 123 compounds. Because of the complexity of the high-temperature phase diagram, the synthesis history can significantly influence the properties. Room-temperature annealing experiments show that defect ordering on a short length scale can have a remarkable affect on superconductivity. We propose that structural coherence in the CuO2 planes, which is present only if there is orthorhombic symmetry on at least a short length scale, is a requirement for superconductivity in these compounds. C1 ARGONNE NATL LAB,TECHNOL CTR SUPERCOND,ARGONNE,IL 60439. IIT,DEPT PHYS,CHICAGO,IL 60616. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP JORGENSEN, JD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011; Segre, Carlo/B-1548-2009; OI Radaelli, Paolo/0000-0002-6717-035X; Segre, Carlo/0000-0001-7664-1574; Lightfoot, Philip/0000-0001-7048-3982 NR 38 TC 61 Z9 61 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 184 EP 189 DI 10.1016/0921-4534(91)91970-F PN 1 PG 6 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700035 ER PT J AU VINOKUR, VV BLATTER, G FEIGELMAN, MV GESHKENBEIN, VB LARKIN, AI AF VINOKUR, VV BLATTER, G FEIGELMAN, MV GESHKENBEIN, VB LARKIN, AI TI FLUX DYNAMICS IN HIGH-TC SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID HIGH-TEMPERATURE SUPERCONDUCTORS; SINGLE-CRYSTALS; CREEP; YBA2CU3O7-X; DENSITY; MOTION; STATE; FIELD; DECAY AB The theory of collective creep describing flux motion in a vortex glass state, and the theory of pinning of a vortex liquid by weak disorder are discussed. The exact solution for flux creep in a single-vortex pinning regime, and the theory of quantum collective creep are presented. RP VINOKUR, VV (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Feigelman, Mikhail/M-4113-2013 NR 43 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 276 EP 281 DI 10.1016/0921-4534(91)91985-D PN 1 PG 6 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700050 ER PT J AU CRABTREE, GW KWOK, WK WELP, U DOWNEY, J FLESHLER, S VANDERVOORT, KG LIU, JZ AF CRABTREE, GW KWOK, WK WELP, U DOWNEY, J FLESHLER, S VANDERVOORT, KG LIU, JZ TI ANISOTROPIC TWIN BOUNDARY PINNING IN YBA2CU3OX SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID SINGLE-CRYSTAL YBA2CU3O7-DELTA; UPPER CRITICAL-FIELD; SUPERCONDUCTORS AB The reduction in flux motion resistivity due to pinning at twin boundaries in single crystal YBa2Cu3Ox is demonstrated. Pinning takes place only for magnetic fields aligned within a critical angle of the twin boundary plane. The critical angle varies with field direction and with field strength for H II c. The onset temperature of twin boundary pinning is established by its strong anisotropy, and shown to correspond with a feature in the temperature dependent resistivity for H II c. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP CRABTREE, GW (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 13 TC 31 Z9 31 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 282 EP 287 DI 10.1016/0921-4534(91)91986-E PN 1 PG 6 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700051 ER PT J AU WILLIAMS, JM WANG, HH CARLSON, KD KINI, AM GEISER, U SCHULTZ, AJ KWOK, WK WELP, U CRABTREE, GW FLESHLER, S WHANGBO, MH SCHIRBER, JE AF WILLIAMS, JM WANG, HH CARLSON, KD KINI, AM GEISER, U SCHULTZ, AJ KWOK, WK WELP, U CRABTREE, GW FLESHLER, S WHANGBO, MH SCHIRBER, JE TI NEW HIGH-TC BENCHMARKS FOR ORGANIC AND FULLERENE SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID K-(BEDT-TTF)2CUBR AB Superconductivity in the highest-T(c) radical-cation [kappa-(ET)2Cu[N(CN)2]X, X = Br (T(c) = 11.6 K), X = Cl (T(c) = 12.8 K, 0.3 kbar)] and radical-anion [KxC60 (T(c) = 18.0 K), RbxC60 (T(c) = 28.6 K)] organic superconductors is discussed. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SANDIA NATL LABS,DEPT CHEM,ALBUQUERQUE,NM 87185. RP WILLIAMS, JM (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 21 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 355 EP 359 DI 10.1016/0921-4534(91)91999-K PN 1 PG 5 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700064 ER PT J AU POEPPELMEIER, KR THIEL, JP VAUGHEY, JT ANDERSON, MT GROENKE, DA STERN, CL DABROWSKI, B HINKS, DG MITCHELL, AW AF POEPPELMEIER, KR THIEL, JP VAUGHEY, JT ANDERSON, MT GROENKE, DA STERN, CL DABROWSKI, B HINKS, DG MITCHELL, AW TI NEW FAMILY OF PLANAR CUPRATE SUPERCONDUCTORS - EFFECT OF NONMAGNETIC CHAINS AND PLANES SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE AB The synthesis of layered cuprates with nonmagnetic and fixed oxidation state cations separating Cu-O planes has, until now, led to nonsuperconducting materials. Recently we were able to introduce superconductivity in Y-Sr-Cu-Ga-O system by appropriate doping and annealing. C1 NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCOND,EVANSTON,IL 60208. NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. ARGONNE NATL LAB,ARGONNE,IL 60439. NO ILLINOIS UNIV,DE KALB,IL 60115. RP POEPPELMEIER, KR (reprint author), NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208, USA. OI Vaughey, John/0000-0002-2556-6129 NR 4 TC 10 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 525 EP 526 DI 10.1016/0921-4534(91)92065-J PN 1 PG 2 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700130 ER PT J AU BORDET, P HODEAU, JL MAREZIO, M MCWHAN, DB MELVILLE, RJ PALMER, S AF BORDET, P HODEAU, JL MAREZIO, M MCWHAN, DB MELVILLE, RJ PALMER, S TI STRUCTURAL STUDY OF (ND1.85,CE0.15)CUO4 SUPERCONDUCTING SINGLE-CRYSTAL BY X-RAY SYNCHROTRON RADIATION DIFFRACTION SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID NEUTRON AB We carried out a diffraction profile shape study of a nearly perfect superconducting single crystal of the (Nd1.85Ce0.15)CuO4 compound in order to detect cooperative deformations associated to the superconducting transition, and check the existence of a superstructure,. No change in reciprocal space was detected around Tc. No superstructure reflexions or diffuse scattering could be observed up to a sensibility of 10(-5). The presence of a minority phase with a slightly larger c parameter was observed. It is attributed to inhomogeneities of Ce content inside the crystal. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV WARWICK,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. NSLS,BNL,LONG ISL,NY 11973. RP BORDET, P (reprint author), CNRS,CRISTALLOG LAB,BP 166X,F-38042 GRENOBLE,FRANCE. NR 3 TC 3 Z9 3 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 DEC 1 PY 1991 VL 185 BP 543 EP 544 DI 10.1016/0921-4534(91)92074-L PN 1 PG 2 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700139 ER PT J AU MOROSIN, B KWEI, GH SCHIRBER, JE VOIGT, JA VENTURINI, EL GOLDSTONE, JA AF MOROSIN, B KWEI, GH SCHIRBER, JE VOIGT, JA VENTURINI, EL GOLDSTONE, JA TI SUPERCONDUCTING SUPEROXYGENATED LA2-XSRXCUO4+DELTA - SEARCH FOR PHASE-SEPARATION SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE ID NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; LA2CUO4.032 AB High pressure (2.3 kbar) high temperature (575-degrees-C) oxygen annealed ceramic La2-xSrxCuO4+delta, with x = 0.1 and 0.16, have been studied by high-resolution neutron powder diffraction to determine their low temperature structural properties in comparison to similarly oxygenated La2CuO4+delta. Unlike La2CuO4+delta, these Sr-containing superconductors show no low temperature phase separation. Further, for x = 0.16, the interstitial oxygen appears to be located at (1/4, 1/4, z) with z = 0.163(5) and to have a value of delta-consistent with La1.84Sr0.16CuO4.019. Such a site is significantly displaced away from the interstitial location, (1/4, 1/4, z) with z congruent-to 0.25 observed in La2CuO4+delta. For x = 0.1, no interstitial oxygen is found and delta = 0.0. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP MOROSIN, B (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, 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 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 565 EP 566 DI 10.1016/0921-4534(91)92085-P PN 1 PG 2 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700150 ER PT J AU MOROSIN, B VENTURINI, EL GINLEY, DS AF MOROSIN, B VENTURINI, EL GINLEY, DS TI ANNEALING AND STRUCTURE STUDIES ON TI-2223 AND TI-1223 CRYSTALS SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PERFECTURE AB Single crystals with nominal stoichiometry Tl2Ca2Ba2Cu3O10 (Tl-2223) and TlCa2Ba2Cu3O9 (Tl-1223) have been annealed in flowing oxygen or nitrogen and the complete crystal structure determined by least-squares refinement of Mo K-alpha x-ray diffraction data. Small atomic displacements are found after the anneals that are consistent with a model in which small amounts of Tl1+ present in the Tl-0 layer are subsequently reversibly oxidized/reduced during mild oxygen/nitrogen anneals to Tl3+. Despite substantial changes in oxygen content in the Tl-0 layers with annealing, Meissner data show very modest shifts in the superconducting transition temperature, suggesting little change in the carrier concentration in the Cu-O2 planes. RP MOROSIN, B (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 657 EP 658 DI 10.1016/0921-4534(91)92131-T PN 1 PG 2 WC Physics, Applied SC Physics GA GW827 UT WOS:A1991GW82700196 ER PT J AU HOWELL, RH STERNE, FA SOLAL, F FLUSS, MJ HAGHIGHI, H KAISER, JH RAYNER, SL WEST, RN LIU, JZ SHELTON, P KOJIMA, H KITAZAWA, K AF HOWELL, RH STERNE, FA SOLAL, F FLUSS, MJ HAGHIGHI, H KAISER, JH RAYNER, SL WEST, RN LIU, JZ SHELTON, P KOJIMA, H KITAZAWA, K TI FERMI-SURFACE MEASUREMENTS IN YBA2CU3O7-X AND LA1.874SR.126CUO4 SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB We report new, ultra high precision measurements of the electron-positron momentum spectra of YBa2Cu3O7-x and La1.874Sr.126CuO4. The YBCO experiments were performed on twin free, single crystals and show discontinuities with the symmetry of the Fermi surface of the CuO chain bands. Conduction band and underlying features in LSCO share the same symmetry and can only be separated with the aid of LDA calculations. C1 UNIV TEXAS,ARLINGTON,TX 76019. UNIV CALIF DAVIS,DAVIS,CA 95616. YAMANASHI UNIV,KOFU,YAMANASHI 400,JAPAN. UNIV TOKYO,TOKYO 113,JAPAN. RP HOWELL, RH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. OI rayner, simon/0000-0001-8703-9140 NR 7 TC 1 Z9 1 U1 1 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 DEC 1 PY 1991 VL 185 BP 735 EP 736 DI 10.1016/0921-4534(91)91591-Q PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000002 ER PT J AU JIA, YX LIU, JZ LAN, MD KLAVINS, P SHELTON, RN RADOUSKY, HB AF JIA, YX LIU, JZ LAN, MD KLAVINS, P SHELTON, RN RADOUSKY, HB TI SUPERCONDUCTING AND NORMAL STATE PROPERTIES OF Y1-XPRXBA2CU3O7-DELTA SINGLE-CRYSTALS SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB Superconducting and normal state properties of Y1-xPrxBa2Cu3O7-delta single crystals have been investigated by means of electronic transport and magnetic measurements a function of temperature and magnetic field. The results are compared with corresponding results from polycrystalline samples. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP JIA, YX (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 769 EP 770 DI 10.1016/0921-4534(91)91608-7 PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000019 ER PT J AU QIU, CH AHRENKIEL, SP WADA, N CISZEK, TF AF QIU, CH AHRENKIEL, SP WADA, N CISZEK, TF TI X-RAY-DIFFRACTION AND HIGH-PRESSURE RAMAN-SCATTERING STUDY OF IODINE-INTERCALATED BI2SR2CACU2O8+X SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB Single-crystal, stage-1 IBi2Sr2CaCu2O8+x was synthesized. X-ray diffraction patterns indicate that upon intercalation, the c-axis correlation length decreases substantially, but the in-plane host layer structure appears to remain unchanged. The compounds exhibit resonance Raman scattering. Raman peaks observed are claimed to correspond to an I2 stretching mode. It is suggested that the intercalated layers consist of I2 molecules with two possible orientations. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP QIU, CH (reprint author), COLORADO SCH MINES,DEPT PHYS,GOLDEN,CO 80401, USA. NR 7 TC 14 Z9 14 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 DEC 1 PY 1991 VL 185 BP 825 EP 826 DI 10.1016/0921-4534(91)91636-I PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000047 ER PT J AU EGAMI, T TOBY, BH BILLINGE, SJL ROSENFELD, HD JORGENSEN, JD HINKS, DG DABROWSKI, B SUBRAMANIAN, MA CRAWFORD, MK FARNETH, WE MCCARRON, EM AF EGAMI, T TOBY, BH BILLINGE, SJL ROSENFELD, HD JORGENSEN, JD HINKS, DG DABROWSKI, B SUBRAMANIAN, MA CRAWFORD, MK FARNETH, WE MCCARRON, EM TI LOCAL STRUCTURAL ANOMALY NEAR TC OBSERVED BY PULSED NEUTRON-SCATTERING SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB Pulsed neutron scattering studies carried out with the atomic pair distribution method show that the actual atomic structure of superconducting oxides has significant local deviation from the crystallographic average structure, and the deviation shows an anomalous change through the superconducting transition. This anomaly is likely to provide information regarding the coupling mechanism. C1 DUPONT CO,CENT RES & DEV,WILMINGTON,DE 19898. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP EGAMI, T (reprint author), UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104, USA. RI Toby, Brian/F-3176-2013 OI Toby, Brian/0000-0001-8793-8285 NR 3 TC 30 Z9 30 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 DEC 1 PY 1991 VL 185 BP 867 EP 868 DI 10.1016/0921-4534(91)91657-P PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000068 ER PT J AU MAREZIO, M TAKAGI, H BATLOGG, B BORDET, P COX, DE UCHIDA, S AF MAREZIO, M TAKAGI, H BATLOGG, B BORDET, P COX, DE UCHIDA, S TI MICROSTRUCTURAL ASPECTS OF THE LTO-]LTT TRANSITION IN LA1.875BA0.125CUO4 SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB We investigated the LTO --> LTT transition occurring in La1.875Ba0.125CuO4 by synchrotron x-ray diffraction using two powder samples prepared by different techniques. The profile analysis of some hk0 and 001 reflections showed that the transition is very sensitive to the microstructure and that the strain release plays an important role in driving the LTO --> LTT transition. C1 UNIV JOSEPH FOURIER,CNRS,CRISTALLOG LAB,F-38042 GRENOBLE,FRANCE. BROOKHAVEN NATL LAB,UPTON,NY 11794. UNIV TOKYO,TOKYO 113,JAPAN. RP MAREZIO, M (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Takagi, Hidenori/B-2935-2010 NR 3 TC 4 Z9 4 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 DEC 1 PY 1991 VL 185 BP 873 EP 874 DI 10.1016/0921-4534(91)91660-V PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000071 ER PT J AU YOU, HD WELP, U FANG, Y AF YOU, HD WELP, U FANG, Y TI INPLANE LATTICE EXPANSION ANOMALIES OF UNTWINNED SINGLE-CRYSTALS OF YBA2CU3O7-DELTA SUPERCONDUCTOR SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB The Anisotropic lattice expansion of untwinned single crystals of YBa2Cu3O7-delta was measured by a high resolution x-ray diffraction technique. Several slope discontinuities including ones near T(c) were observed. In comparison to the recent internal friction studies, it was found that every lattice expansion anomaly seen in a and b axes has a corresponding internal friction peak. In particular, the internal friction anomalies near T(c) is consistent with the Akhieser effect, indicating that the slope discontinuity and the internal friction anomaly have the same microscopic origin, i.e., lattice fluctuations. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439. RP YOU, HD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 9 TC 4 Z9 4 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 DEC 1 PY 1991 VL 185 BP 875 EP 876 DI 10.1016/0921-4534(91)91661-M PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000072 ER PT J AU PHAM, T LEE, MW DREW, HD WELP, U FANG, Y AF PHAM, T LEE, MW DREW, HD WELP, U FANG, Y TI ANISOTROPIC IR ABSORPTIVITY OF SINGLE DOMAIN YBA2CU3O7 SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID UNTWINNED YBA2CU3O7-DELTA; CRYSTAL AB Far infrared measurements on detwinned single crystals at 2 K give an anisotropic absorptivity for the a and b polarizations. A congruent-to 0.5% for the a axis from congruent-to 100cm-1 up to the optical edge at 400cm-1. The a axis conductivity shows low frequency absorption bands of electronic strength. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT & MAT,DIV SCI,ARGONNE,IL 60439. RP PHAM, T (reprint author), UNIV MARYLAND,DEPT PHYS,CTR SUPERCONDUCTIV RES,COLLEGE PK,MD 20742, USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 947 EP 948 DI 10.1016/0921-4534(91)91697-3 PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000108 ER PT J AU PHILLIPS, NE FISHER, RA WRIGHT, DA AMATO, A CASPARY, R RADOUSKY, HB PENG, JL ZHANG, L SHELTON, RN AF PHILLIPS, NE FISHER, RA WRIGHT, DA AMATO, A CASPARY, R RADOUSKY, HB PENG, JL ZHANG, L SHELTON, RN TI MAGNETIC-ORDERING, HYPERFINE AND LINEAR CONTRIBUTIONS TO THE LOW-TEMPERATURE SPECIFIC-HEAT OF (Y1-XPRX)BA2CU3O7 SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB Specific-heat measurements on (Y1-xPrx)Ba2Cu3O7, x = 0, 0.1, 0.2, 0.3, 0.6, 0.8 and 1; 0.3 less-than-or-equal-to T less-than-or-equal-to 100K; and in magnetic fields to 7T are reported. The combination of low-temperature and in-field data allows the separation of hyperfine and magnetic ordering contributions from the low-temperature linear term, gamma-T. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP PHILLIPS, NE (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Amato, Alex/H-7674-2013 OI Amato, Alex/0000-0001-9963-7498 NR 3 TC 3 Z9 3 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 DEC 1 PY 1991 VL 185 BP 1069 EP 1070 DI 10.1016/0921-4534(91)91758-V PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000169 ER PT J AU HAMMEL, PC AHRENS, ET REYES, AP HEFFNER, RH CANFIELD, PC CHEONG, SW FISK, Z SCHIRBER, JE AF HAMMEL, PC AHRENS, ET REYES, AP HEFFNER, RH CANFIELD, PC CHEONG, SW FISK, Z SCHIRBER, JE TI LA-139 NMR AND NQR STUDY OF THE TEMPERATURE-DEPENDENT STRUCTURE OF LA2CUO4-DELTA SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID PHASE-SEPARATION; LA2CUO4+DELTA AB NMR and NQR reveal substantial structural changes in the metallic phase of La2CuO4+delta which occur below 220 K. The oxygen octahedra in the metallic phase are not tilted at phase separation; upon cooling to 40 K considerable tilt has developed. The low temperature structure is highly disordered. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HAMMEL, PC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014; Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 4 TC 16 Z9 16 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 DEC 1 PY 1991 VL 185 BP 1095 EP 1096 DI 10.1016/0921-4534(91)91771-U PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000182 ER PT J AU TAKIGAWA, M SMITH, JL HULTS, WL AF TAKIGAWA, M SMITH, JL HULTS, WL TI TEMPERATURE-DEPENDENT ANISOTROPY OF CU(2) NUCLEAR-RELAXATION RATE IN YBA2CU3O7 BELOW TC SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB We have measured the anisotropy of the planar Cu nuclear spin-lattice relaxation rate in YBa2Cu3O7 in a small magnetic field (0.44 T). The anisotropy is almost temperature independent in the normal state but decreases rapidly below T(c), shows a minimum near 70 to 80 K and increases again at lower temperatures. Since the ratio of the relaxation rates at the Cu and Oxygen sites is independent of temperature below T(c), indicating that antiferromagnetic spin correlations still remain in the superconducting state and that the superconducting gap is nearly q-independent, the T-dependence of the anisotropy is difficult to understand within the framework of the models of isotropic antiferromagnetic spin fluctuations that have been proposed to analyze the normal state NMR results. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP TAKIGAWA, M (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. NR 6 TC 8 Z9 8 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 DEC 1 PY 1991 VL 185 BP 1105 EP 1106 DI 10.1016/0921-4534(91)91776-Z PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000187 ER PT J AU TOMENO, I WILLIS, JO MACHI, T KOSUGE, M MIYAKATE, T TAI, K KOSHIZUKA, N TANAKA, S AF TOMENO, I WILLIS, JO MACHI, T KOSUGE, M MIYAKATE, T TAI, K KOSHIZUKA, N TANAKA, S TI MAGNETIC-SUSCEPTIBILITY OF THE (Y,CA)(BA,LA)2CU4O8 SYSTEM SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE AB The normal-state susceptibility-chi for (Y,Ca)(Ba,La)2Cu4O8 (Y124) was determined up to 300 K. For undoped and La-substituted Y124, chi decreases gradually with decreasing temperature, while chi for Ca-substituted Y124 is nearly temperature independent. These results correspond to the temperature dependence of chi for YBa2Cu3Ox with various oxygen contents. For the La substituted Y124, we measured chi for magnetic fields H parallel and perpendicular to the c axis. The temperature-independent difference chi-c - chi-ab may mainly originate from the anisotropic orbital contribution. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. RP TOMENO, I (reprint author), INT SUPERCONDUCT TECHNOL CTR,SUPERCONDUCT RES LAB,1-10-13 SHINONOME,KOTO KU,TOKYO 135,JAPAN. 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 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1165 EP 1166 DI 10.1016/0921-4534(91)91806-F PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000217 ER PT J AU MAHAJAN, AV JOHNSTON, DC TORGESON, DR BORSA, F AF MAHAJAN, AV JOHNSTON, DC TORGESON, DR BORSA, F TI MAGNETIC AND ELECTRONIC-PROPERTIES OF LAXSR1-XVO3 SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID SUPERCONDUCTIVITY AB The composition induced metal (x < 0.7) to antiferromagnetic insulator transition in LaxSr1-xVO3 is reminiscent of the phase diagrams of the high T(c) cuprates such as La2-xSrxCuO4. Herein, we present an analysis of our susceptibility and V-51 NMR data in LaxSr1-xVO3 for the metallic compositions. The data are indicative of a strongly exchange enhanced narrow d-band metal. No evidence was found for antiferromagnetic spin fluctuations, in strong contrast to the metallic cuprates, which show clear evidence for these fluctuations for compositions in the vicinity of the metal-insulator transition. No evidence for superconductivity in our materials was found. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP MAHAJAN, AV (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 3 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1195 EP 1196 DI 10.1016/0921-4534(91)91821-K PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000232 ER PT J AU DAWSON, WK BOEKEMA, C LICHTI, RL COOKE, DW AF DAWSON, WK BOEKEMA, C LICHTI, RL COOKE, DW TI MAGNETIC FRUSTRATION, MUON PROBING, AND HYDROGEN-BONDING IN RBA2CU3OY SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID SPIN-RELAXATION; (Y1-XPRX)BA2CU3O7 AB Recent muon-spin-relaxation (mu-SR) studies on (PrxY1-x)Ba2Cu3Oy and HzYBa2Cu3O7 have confirmed the muon-probe site location near the BaO planes. Similar behavior for H+ in Hydrogen-doped YBa2Cu3O7 is seen as has been observed for the mu+, namely bonding with oxygen. Thus, the knowledge of the muon-probe site in R123y improves the interpretations of the mu-SR magnetic studies in (PrxY1-x)1237 and the mu-SR vortex studies in R1237. Magnetic frustration appears to be the key to resolve the physical origin of the CuO-based superconductivity. C1 TEXAS TECH UNIV,LUBBOCK,TX 79409. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP DAWSON, WK (reprint author), SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192, USA. NR 12 TC 3 Z9 3 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 DEC 1 PY 1991 VL 185 BP 1221 EP 1222 DI 10.1016/0921-4534(91)91834-Q PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000245 ER PT J AU GORDON, JE PRIGGE, S COLLOCOTT, SJ DRIVER, R AF GORDON, JE PRIGGE, S COLLOCOTT, SJ DRIVER, R TI SPECIFIC-HEAT OF (BIPB)2SR2CA2CU3O10-Y FROM 78-K TO 300-K SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID TC AB The specific heat anomaly of a polycrystalline sample of BPSCCO (2223 phase) was found to have a peak height-delta-C(T(c))/T(c) almost-equal-to 24 mJ/mole K2 at T(c) almost-equal-to 107 K. The anomaly provides evidence for a fluctuation contribution above T(c), whereas below T(c) it is not possible to separate fluctuation and strong-coupling effects. A second, considerably smaller, anomaly appears at T almost-equal-to 101 K when the sample is cooled rapidly from 140 K to 78 K. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. CSIRO,DIV APPL PHYS,LINDFIELD,NSW 2070,AUSTRALIA. RP GORDON, JE (reprint author), AMHERST COLL,DEPT PHYS,AMHERST,MA 01002, USA. NR 5 TC 16 Z9 16 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 DEC 1 PY 1991 VL 185 BP 1351 EP 1352 DI 10.1016/0921-4534(91)91899-F PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000310 ER PT J AU WRIGHT, DA EMERSON, JP WOODFIELD, BF FISHER, RA PHILLIPS, NE CRAWFORD, MK MCCARRON, EM AF WRIGHT, DA EMERSON, JP WOODFIELD, BF FISHER, RA PHILLIPS, NE CRAWFORD, MK MCCARRON, EM TI SPECIFIC-HEAT ANOMALIES IN LA2-XMXCUO4(M = BA, SR, X = 0.09, 0.12, 0.15) NEAR 70 AND 100K SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID LA2-XBAXCUO4; PHASE AB Specific heat measurements show, for LMCO [M = B(Ba), S(Sr); x = 0.09, 0.12, 0.15], hysteresis and anomalous behavior in the 85-125K region and, for LBCO(0.12) and LSCO(0.09), similar magnetic field-dependent anomalies near 70K. Neutron and x-ray studies by others have shown the existence of an orthorhombic-tetragonal transition for LBCO near 70K but gave no indication of structural transitions in the other cases. The occurrence of transitions, and their x-dependence, in these materials is of interest for the possibility of its connection with the x-dependence of superconducting properties including the isotope effect. C1 DUPONT CO,WILMINGTON,DE 19880. RP WRIGHT, DA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 8 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1387 EP 1388 DI 10.1016/0921-4534(91)91917-S PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000328 ER PT J AU EMIN, D AF EMIN, D TI LARGE BIPOLARONS AND SUPERCONDUCTIVITY SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB With a strong electron-lattice interaction, charge carriers pair as bipolarons. In analogy with large (multisite) polarons, large bipolarons move itinerantly. Such mobile-charge bosons can condense into a superconducting state. Distinctive properties characterize large bipolarons. RP EMIN, D (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 7 Z9 7 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 DEC 1 PY 1991 VL 185 BP 1593 EP 1594 DI 10.1016/0921-4534(91)90923-M PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800089 ER PT J AU FEDRO, AJ SCHUTTLER, HB AF FEDRO, AJ SCHUTTLER, HB TI CU-O CHARGE FLUCTUATIONS AND ELECTRON-PHONON COUPLING IN THE EFFECTIVE SINGLE-BAND HUBBARD THEORY FOR CUPRATE SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID PARAMETERS; OXIDES AB We present results for the effective electronic and breathing mode electron-phonon coupling parameters in an effective single band model for the cuprate materials which explicitly incorporates the lowest energy Cu-O charge excitations of the more complicated multi-band models. We point out the possibility that the cuprates may be close to a phonon-driven charge instability. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV GEORGIA,CTR SIMULAT PHYS,ATHENS,GA 30602. RP FEDRO, AJ (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 11 TC 4 Z9 4 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 DEC 1 PY 1991 VL 185 BP 1673 EP 1674 DI 10.1016/0921-4534(91)90963-Y PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800129 ER PT J AU SOUKOULIS, CM AF SOUKOULIS, CM TI MONTE-CARLO AND SPIN-WAVE STUDIES OF ANTIFERROMAGNETIC ORDERING IN ANISOTROPIC HEISENBERG SYSTEMS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB The Anisotropic Heisenberg antiferromagnet (AF), which is defined as a three-dimensional simple cubic lattice with in-plane AF interaction J parallel-to and interplane J perpendicular-to = gamma-J parallel-to, is studied using low-T spin wave theory and Monte Carlo (MC) simulations. The dependence of the ground state properties and the Neel temperature T(N) on the anisotropy gamma(0 less-than-or-equal-to gamma less-than-or-equal-to 1) are obtained. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP SOUKOULIS, CM (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1693 EP 1694 DI 10.1016/0921-4534(91)90973-3 PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800139 ER PT J AU WELP, U FLESHLER, S KWOK, WK KLEMM, RA VINOKUR, VM DOWNEY, J CRABTREE, GW AF WELP, U FLESHLER, S KWOK, WK KLEMM, RA VINOKUR, VM DOWNEY, J CRABTREE, GW TI SCALING BEHAVIOR OF THE FLUCTUATIONS IN MAGNETIZATION AND CONDUCTIVITY OF UNTWINNED YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID UPPER CRITICAL-FIELD; SUPERCONDUCTORS; TEMPERATURE AB We present measurements of the magnetization and conductivity of a untwinned YBa2Cu3O7-delta crystal near the superconducting transition. Both quantities display the scaling properties predicted on the basis of Ginzburg-Landau theory. The set of T(c)(H) which optimizes the scaling is the same for the magnetization and conductivity data and agrees well with earlier determinations. C1 PURDUE UNIV,W LAFAYETTE,IN 47907. RUSSIAN ACAD SCI,INST SOLID STATE PHYS,CHERNOGOLOVKA 142432,RUSSIA. RP WELP, U (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 12 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1785 EP 1786 DI 10.1016/0921-4534(91)91018-Y PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800184 ER PT J AU REISSNER, M STEINER, W KRITSCHA, W SAUERZOPF, FM WEBER, HW CRABTREE, GW AF REISSNER, M STEINER, W KRITSCHA, W SAUERZOPF, FM WEBER, HW CRABTREE, GW TI ACTIVATION-ENERGIES IN A BI2SR2CACU2OX SINGLE-CRYSTAL SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB The analysis of the time dependent magnetization measured in a field of 1T for a Bi2212 single crystal leads to a distribution of activation energies with distinctly larger half width for B parallel-to (a, b) than for B parallel-to c. Within a model of thermally activated flux creep, different values for the relaxation time are obtained depending on the field direction. C1 UNIV VIENNA,ATOMINST,A-1020 VIENNA,AUSTRIA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP REISSNER, M (reprint author), VIENNA TECH UNIV,INST ANGEW & TECH PHYS,A-1040 VIENNA,AUSTRIA. NR 3 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 DEC 1 PY 1991 VL 185 BP 1819 EP 1820 DI 10.1016/0921-4534(91)91035-3 PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800201 ER PT J AU HAO, ZD CLEM, JR CHO, JH JOHNSTON, DC AF HAO, ZD CLEM, JR CHO, JH JOHNSTON, DC TI A SCALING PROPERTY IN THE REVERSIBLE MAGNETIZATION OF ANISOTROPIC HIGH-KAPPA TYPE-II SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB We find that the reversible magnetization M of an anisotropic high-kappa type-II superconductor can be written to good approximation as -4-pi-M = (H(c)2/H(c2)) PHI (h) for the applied field H >> H(c1), where h = H/H(c2) is the reduced field and PHI is a function of h. For the high-temperature superconductors, this property gives the relation M parallel-to c(H) = gamma-M parallel-to ab(gamma-H), where M parallel-to i is the magnetization for H parallel to the i direction and gamma = H(c2 parallel-to ab)/H(c2 parallel-to c) is the anisotropy ratio. It provides a simple way to estimate gamma from the reversible magnetization measurement, and we find gamma congruent-to 18 as a lower bound for a Bi2Sr2CaCu2O8 single crystal. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP HAO, ZD (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 5 TC 9 Z9 9 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 DEC 1 PY 1991 VL 185 BP 1871 EP 1872 DI 10.1016/0921-4534(91)91061-8 PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800227 ER PT J AU CLEM, JR COFFEY, MW AF CLEM, JR COFFEY, MW TI RADIOFREQUENCY SURFACE IMPEDANCE OF TYPE-II SUPERCONDUCTORS - DEPENDENCE UPON THE MAGNITUDE AND ANGLE OF AN APPLIED STATIC MAGNETIC-FIELD SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB The application of a static magnetic field introduces vortices into a type-II superconductor. The dynamic response of these vortices strongly affects the surface impedance (surface resistance and surface reactance) of the superconductor. Using a self-consistent approach for including the influence of the vortices upon the complex-valued radio-frequency penetration depth, we calculate in this paper how the surface impedance depends upon the static magnetic field's magnitude and angle relative to the surface and to the rf magnetic field. The surface resistance is maximized when the induced rf currents are perpendicular to the static field. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 2 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1915 EP 1916 DI 10.1016/0921-4534(91)91083-G PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800249 ER PT J AU ZEGENHAGEN, J HABERMEIER, HU SIEGRIST, T PATEL, JR FONTES, E BERMAN, LE AF ZEGENHAGEN, J HABERMEIER, HU SIEGRIST, T PATEL, JR FONTES, E BERMAN, LE TI YBA2CU3O7 ON SRTIO3 (100) AND SI(111) INVESTIGATED WITH X-RAY STANDING WAVES SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID THIN-FILMS AB In the present study we applied the x-ray standing wave technique, using Synchrotron Radiation, for investigating ultra-thin (approximately 100 angstrom), c-oriented, epitaxial films of YBa2Cu3O7. The results obtained for MBE grown films on SrTiO3 (100) demonstrate good epitaxial quality and a well defined interface structure. The results obtained for laser deposited films on Si(111) are dominated by the unfavorable lattice mismatch between substrate and epilayer. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP ZEGENHAGEN, J (reprint author), MAX PLANCK INST FESTKORPERFORSCH,HEISENBERGSTR 1,W-7000 STUTTGART 80,GERMANY. NR 5 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2077 EP 2078 DI 10.1016/0921-4534(91)91163-X PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800329 ER PT J AU LING, XS SHI, D BUDNICK, JI AF LING, XS SHI, D BUDNICK, JI TI SELF-ORGANIZED CRITICAL STATE IN HIGH-TC SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID FLUX CREEP AB Flux creep data of a single crystal BSCCO are shown to demonstrate a qualitative agreement with the model of self-organized critical (SOC) state. The scaling behavior of j-E (or I-V) is interpreted in the picture of critical self-organization of avalanche flux motion. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LING, XS (reprint author), UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269, USA. RI Ling, Xinsheng/A-9219-2008 NR 13 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2181 EP 2182 DI 10.1016/0921-4534(91)91215-P PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900024 ER PT J AU CHRISTEN, DK FEENSTRA, R AF CHRISTEN, DK FEENSTRA, R TI EFFECTS OF THERMAL-PROCESSING AND OXYGEN COMPOSITION ON FLUX PINNING IN HIGH-JC EPITAXIAL Y1BA2CU3O7-X THIN-FILMS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB High-J(c), c-axis epitaxial Y1Ba2Cu3O7-x thin films were produced by post-annealing of Y, BaF2, and Cu precursor films in wet oxygen. The films were reacted either at 835-degrees-C in 1 atm, or at 800-degrees-C in a low oxygen partial pressure p(O2); the chain-site oxygen deficiency x was subsequently varied by low temperature anneals below 550-degrees-C in various p(O2) less-than-or-equal-to 1 atm. All films showed a monotonic decrease in J(c) with increasing x, but exhibited a T(c)(x) that was dependent on the initial formation conditions. The effects are of electronic origin, and are consistent with a simple model of carrier density influence on near-optimal flux pinning. RP CHRISTEN, DK (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 6 TC 8 Z9 8 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 DEC 1 PY 1991 VL 185 BP 2225 EP 2226 DI 10.1016/0921-4534(91)91237-X PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900046 ER PT J AU GINLEY, DS VENTURINI, EL TIGGES, CP ZIPPERIAN, TE BAUGHMAN, RJ BARBOUR, JC MOROSIN, B AF GINLEY, DS VENTURINI, EL TIGGES, CP ZIPPERIAN, TE BAUGHMAN, RJ BARBOUR, JC MOROSIN, B TI TRANSPORT AND PINNING IN HIGH-QUALITY TL-CA-BA-CU-O FILMS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB Tl-Ca-Ba-Cu-O High temperature superconductors, especially Tl2Ca2Ba2Cu3O10 with a T(c) of 120K, are of considerable interest for practical applications. Thin films in this system have demonstrated high T(c)'s, compositional tolerance, and a lack of weak links at the grain boundaries. Flux pinning in the system is appreciably weaker than the YBa2Cu3O7 materials as evidenced by large magnetic relaxation and the decrease in critical current density at high magnetic field. Recent work has evaluated the effect of improving film quality on the pinning and explored methods of increasing the pinning. We have made substantial improvements in the film quality that resulted in "decreased" pinning; ion irradiation slightly enhances the pinning. RP GINLEY, DS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 2 TC 4 Z9 4 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 DEC 1 PY 1991 VL 185 BP 2275 EP 2276 DI 10.1016/0921-4534(91)91262-3 PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900071 ER PT J AU LENSINK, JG GRIESSEN, R WIESINGER, HP SAUERZOPF, FM WEBER, HW CRABTREE, GW AF LENSINK, JG GRIESSEN, R WIESINGER, HP SAUERZOPF, FM WEBER, HW CRABTREE, GW TI FAST-NEUTRON IRRADIATION EFFECTS ON MAGNETIZATION RELAXATION IN YBCO SINGLE-CRYSTALS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID GLASS STATE; SUPERCONDUCTORS; LA2CUO4-Y-BA; CREEP AB A high-quality YBa2Cu3O7-delta single crystal has been investigated by torque magnetometry prior to and following fast neutron irradiation to a fluence of 2x10(21) m-2 (E > 0.1 MeV). In addition to large enhancements of the critical current densities, which have been observed in similar form previously by Sauerzopf et al. 1, we find a dramatic change in the relaxation behavior following irradiation. At low temperatures (less-than-or-similar-to 50 K) the relaxation rates are lowered by factors up to 4 in the irradiated state in a magnetic field of 1.5 T. At higher temperatures, on the other hand, they are enhanced compared to the unirradiated state. Both before and after irradiation, the magnetization relaxation follows a logarithmic time dependence, which we ascribe to thermally activated flux motion. C1 OSTERREISCH UNIV WIEN,INST ATOM,A-1020 VIENNA,AUSTRIA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LENSINK, JG (reprint author), FREE UNIV AMSTERDAM,FAC PHYS & ASTRON,1081 HV AMSTERDAM,NETHERLANDS. NR 9 TC 9 Z9 9 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 DEC 1 PY 1991 VL 185 BP 2287 EP 2288 DI 10.1016/0921-4534(91)91268-9 PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900077 ER PT J AU XU, M UMEZAWA, A CRABTREE, GW AF XU, M UMEZAWA, A CRABTREE, GW TI INITIAL MAGNETIZATION AND MAGNETIC-RELAXATION IN A SINGLE-CRYSTAL OF BI2SR2CACU2OX SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB The initial magnetization and the magnetic relaxation in a single crystal of Bi2Sr2CaCu2Ox over a wide range of temperatures and fields have been measured. The results show that the initial magnetization varies with the measuring time at a given temperature and the relaxation is logarithmic in our measuring windows. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP XU, M (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2307 EP 2308 DI 10.1016/0921-4534(91)91278-C PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900087 ER PT J AU SHI, D CHEN, JG SALEMSUGUI, S GORETTA, KC AF SHI, D CHEN, JG SALEMSUGUI, S GORETTA, KC TI CRITICAL CURRENTS IN MELT TEXTURED YBA2CU3OX SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB YBa2Cu3Ox bars and wires textured by partial-melt-growth and zone-melting methods have been characterized. Specimens exhibited critical current densities (J(c)) greater than 10(4) A/cm2 at 77 K in a 2 T field. The high J(c) values were related to the presence of low-angle grain boundaries and high concentrations of crystal defects. These defects were found to be effective flux-pinning centers. C1 UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801. RP SHI, D (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, 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 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2329 EP 2330 DI 10.1016/0921-4534(91)91289-G PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900098 ER PT J AU WILLIS, JO NAKAMURA, N GOTOH, S TAKAMUKU, K KOSHIZUKA, N TANAKA, S AF WILLIS, JO NAKAMURA, N GOTOH, S TAKAMUKU, K KOSHIZUKA, N TANAKA, S TI WEAK LINKS WITHIN A BI2SR2CA1CU2OX SINGLE-CRYSTAL BY MAGNETIZATION AND DIRECT OPTICAL OBSERVATIONS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB We have performed magnetic susceptibility and direct optical High Contrast Magnetic Flux (HICOM) observations on a single crystal of Bi2Sr2Ca1Cu2Ox. Low temperature pinning and high temperature flux creep have been observed by HICOM. The results suggest that the breakdown of flux pinning may occur gradually with temperature and may exhibit spatial variation related to sample inhomogeneities. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. RP WILLIS, JO (reprint author), ISTEC,SUPERCONDUCT RES LAB,10-13 SHINONOME 1 CHOME,KOTO KU,TOKYO 135,JAPAN. NR 4 TC 3 Z9 3 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 DEC 1 PY 1991 VL 185 BP 2357 EP 2358 DI 10.1016/0921-4534(91)91303-L PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900112 ER PT J AU KWOK, WK FLESHLER, S WELP, U VINOKUR, VM DOWNEY, J CRABTREE, GW AF KWOK, WK FLESHLER, S WELP, U VINOKUR, VM DOWNEY, J CRABTREE, GW TI FLUX PINNING BY PLANAR DEFECTS IN SINGLE-CRYSTAL YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID SUPERCONDUCTORS AB We report on a novel crossed magnetic field technique to study the critical angle of pinning by twin boundaries and intrinsic pinning by the layered structure in single crystal YBa2Cu3O7-delta. We find a critical angle for intrinsic pinning very close to T(c) which is 10 times smaller than the critical angle for twin boundary pinning. In addition, we present the phase diagram for the onset of twin boundary and intrinsic pinning near T(c). C1 CHERNOGOLOVKA SOLID STATE PHYS INST,CHERNOGOLOVKA,USSR. PURDUE UNIV,W LAFAYETTE,IN 47907. RP KWOK, WK (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, 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 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2371 EP 2372 DI 10.1016/0921-4534(91)91310-Z PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900119 ER PT J AU GESHKENBEIN, VB FEIGELMAN, MV VINOKUR, VM AF GESHKENBEIN, VB FEIGELMAN, MV VINOKUR, VM TI TEMPORAL DECAY AND FREQUENCY-RESPONSE OF THE CRITICAL STATE IN TYPE-II SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB Given a critical state produced by the applied magnetic field B, we investigate the response to a superimposed perturbation delta-B(x,t) << B. The relaxation of the perturbation is described by a diffusion equation with a logarithmic "time", partial derivative delta-B/partial derivative lnt = partial derivative/partial derivative x (D(x) partial derivative delta-B/partial derivative x). For the case of complete penetration the relaxation is of universal character and does not depend upon magnetic field, temperature, and intrinsic parameters of the superconductor. In particular, the absorption of an ac field delta-B is-proportional-to exp(iwt) turns out to be inversely proportional to the square root of the waiting time t(w), 4-pi-chi" = 1/2 square root wt(w), explicitely showing universal behaviour. C1 LD LANDAU THEORET PHYS INST,MOSCOW 117940,USSR. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP GESHKENBEIN, VB (reprint author), SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND. RI Feigelman, Mikhail/M-4113-2013 NR 8 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2511 EP 2512 DI 10.1016/0921-4534(91)91380-M PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900189 ER PT J AU FISHER, RA WOODFIELD, BF KIM, S PHILLIPS, NE TAILLEFER, L GIORGI, AL SMITH, JL AF FISHER, RA WOODFIELD, BF KIM, S PHILLIPS, NE TAILLEFER, L GIORGI, AL SMITH, JL TI SPECIFIC-HEAT OF UPT3 IN THE VICINITY OF THE ANTIFERROMAGNETIC ORDERING AT 5K SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB Specific-heat data in the 0.3 to 20K region for two high-quality UPt3 samples are analyzed with emphasis on the 4-10K region. It is concluded that no effect associated with antiferromagnetic ordering has been observed, and an upper limit of the order of 0.1% for such an effect is deduced. The results are compared with earlier measurements in the vicinity of the Neel temperature, 5K. C1 CNRS,LAB MAGNETISME LOUIS NEEL,F-38042 GRENOBLE,FRANCE. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP FISHER, RA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 6 TC 0 Z9 0 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 DEC 1 PY 1991 VL 185 BP 2639 EP 2640 DI 10.1016/0921-4534(91)91442-7 PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900251 ER PT J AU LE, LP LUKE, GM STERNLIEB, BJ WU, WD UEMURA, YJ WANG, HH KINI, AM WILLIAMS, JM STRONACH, CE AF LE, LP LUKE, GM STERNLIEB, BJ WU, WD UEMURA, YJ WANG, HH KINI, AM WILLIAMS, JM STRONACH, CE TI MAGNETIC PENETRATION DEPTH AND FLUX MELTING IN KAPPA-(BEDT-TTF)2CU[N(CN)2]BR SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN ID ORGANIC SUPERCONDUCTOR AB We have performed muon spin relaxation studies in the quasi-2 dimensional organic superconductor kappa-(ET)2Cu[N(CN)2]Br, applying an external field of 3 kG perpendicular to the conducting planes of single crystal specimens. The relaxation rate in field-cooled measurements shows a linear variation for T less-than-or-equal-to 0.4T(c). This behavior is consistent with an anisotropic pairing state with line nodes in the superconducting energy gap. Zero-field-cooling measurements reveal that magnetic flux is not well-pinned until T less-than-or-equal-to 5 K, well below T(c) = 12 K. C1 VIRGINIA STATE UNIV,DEPT PHYS,PETERSBURG,VA 23803. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LE, LP (reprint author), COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027, USA. RI Kini, Aravinda/F-4467-2012; Luke, Graeme/A-9094-2010; OI Luke, Graeme/0000-0003-4762-1173 NR 9 TC 6 Z9 6 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 DEC 1 PY 1991 VL 185 BP 2661 EP 2662 DI 10.1016/0921-4534(91)91452-A PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900261 ER PT J AU UMEZAWA, A MALIK, SK CRABTREE, GW WANG, HH MONTGOMERY, LK CARLSON, KD WILLIAMS, JM AF UMEZAWA, A MALIK, SK CRABTREE, GW WANG, HH MONTGOMERY, LK CARLSON, KD WILLIAMS, JM TI MAGNETIC-RELAXATION OF THE ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2CU[N(CN)2]BR SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB Magnetic relaxation was measured on a kappa-(ET)2Cu[N(CN)2]Br (ET = BEDT-TTF) single crystal for H//b (perpendicular to the conducting layers) at 6 K. The relaxation rate, dM/dlnt was found to have a maximum at 30 G. This maximum in the relaxation rate is thought to be the field of full penetration, H*, and agrees with the peak observed in the magnetization measurements for H//b at 6 K. The field dependence of the relaxation rate can be described by a thermally activated flux creep model where U(o) approximately 8.3 meV. C1 TATA INST FUNDAMENTAL RES,DEPT PHYS,BOMBAY 400005,INDIA. UNIV ALBERTA,DEPT PHYS,EDMONTON T6G 2E1,ALBERTA,CANADA. INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47401. RP UMEZAWA, A (reprint author), ARGONNE NATL LAB,DIV MAT SCI & CHEM,ARGONNE,IL 60439, USA. NR 7 TC 4 Z9 4 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 DEC 1 PY 1991 VL 185 BP 2665 EP 2666 DI 10.1016/0921-4534(91)91454-C PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900263 ER PT J AU WEIR, ST NELLIS, WJ SEAMAN, CL EARLY, EA MAPLE, MB KIKUCHI, M SYONO, Y AF WEIR, ST NELLIS, WJ SEAMAN, CL EARLY, EA MAPLE, MB KIKUCHI, M SYONO, Y TI SHOCK CONSOLIDATION OF CRYSTALLOGRAPHICALLY ALIGNED BI2SR2CACU2O8 POWDERS SO PHYSICA C LA English DT Article ID COMPACTION; ENERGY AB Bulk samples of crystallographically aligned Bi2Sr2CaCu2O8 were fabricated by shock-consolidation of tapped micaceous powders. Basal plane alignment was verified by means of optical microscopy, X-ray diffraction and magnetic measurements. We have explored the dependence of this crystallographic alignment as a function of both shock pressure (from 35 kbar to 135 kbar) and powder particle size (from < 5-mu-m to 30-37-mu-m). The degree of crystallographic alignment as determined by SQUID magnetometer measurements and X-ray diffraction measurements was found to be insensitive to the shock consolidation pressure, but sensitive to powder particle size, with a decrease in the powder particle size resulting in a decrease in the amount of crystallographic alignment. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. TOHOKU UNIV,INST MAT RES,SENDAI,MIYAGI 980,JAPAN. RP WEIR, ST (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. RI Weir, Samuel/H-5046-2012 NR 13 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 184 IS 1-3 BP 1 EP 12 DI 10.1016/0921-4534(91)91493-N PG 12 WC Physics, Applied SC Physics GA GX031 UT WOS:A1991GX03100001 ER PT J AU MOROSIN, B NEWCOMER, PP BAUGHMAN, RJ VENTURINI, EL LOY, D SCHIRBER, JE AF MOROSIN, B NEWCOMER, PP BAUGHMAN, RJ VENTURINI, EL LOY, D SCHIRBER, JE TI ON THE ORTHORHOMBIC FORM OF C-60 - MOLECULAR-CRYSTALS CONTAINING CS2 SO PHYSICA C LA English DT Article AB Crystals of orthorhombic symmetry obtained on evaporation of CS2 solutions of C60 contain solvent molecules rather than representing a new lower density form of pure C60. Introduction of I2 into the CS2 solutions yields crystals containing solid solutions, i.e. C60.1.5 (CS2, I2). Both types of crystals degrade rapidly in X-ray radiation. RP MOROSIN, B (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 7 TC 27 Z9 27 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 184 IS 1-3 BP 21 EP 23 DI 10.1016/0921-4534(91)91495-P PG 3 WC Physics, Applied SC Physics GA GX031 UT WOS:A1991GX03100003 ER PT J AU KIJIMA, N GRONSKY, R XIANG, XD VAREKA, WA ZETTL, A CORKILL, JL COHEN, ML AF KIJIMA, N GRONSKY, R XIANG, XD VAREKA, WA ZETTL, A CORKILL, JL COHEN, ML TI CRYSTAL-STRUCTURE OF STAGE-2 IODINE-INTERCALATED SUPERCONDUCTING IBI4SR4CA2CU4OX SO PHYSICA C LA English DT Article ID OXIDE AB The crystal structure of stage-2 iodine-intercalated superconducting IBi4Sr4Ca2Cu2Ox has been determined by transmission electron microscopy to belong to the space group Bbmb with lattice parameters a = 5.4 angstrom, b = 5.4 angstrom, c = 68.5 angstrom. Iodine intercalates between every other Bi-O bilayer of the superconducting crystal, expanding the distance between the contiguous Bi-O layers by 3.6 angstrom and altering the atomic stacking across these Bi-O layers from the staggered configuration characteristic of superconducting Bi2Sr2CaCu2Ox to the registered configuration characteristics of stage-1 iodine-intercalated superconducting IBi2Sr2CaCu2Ox. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP KIJIMA, N (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720, USA. RI Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017 OI Zettl, Alex/0000-0001-6330-136X; 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 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 184 IS 1-3 BP 127 EP 134 DI 10.1016/0921-4534(91)91509-3 PG 8 WC Physics, Applied SC Physics GA GX031 UT WOS:A1991GX03100017 ER PT J AU MOUDDEN, AH SCHWEISS, P HENNION, B GEHRING, PM SHIRANE, G HIDAKA, Y AF MOUDDEN, AH SCHWEISS, P HENNION, B GEHRING, PM SHIRANE, G HIDAKA, Y TI NEUTRON-DIFFRACTION STUDY OF THE MAGNETIC-ORDERING OF THE CU++ SPINS IN ND1.5BA1.5CU3O6+X SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID YBA2CU3O6+X; POWDER AB Elastic neutron scattering experiments performed on single crystals of Nd1.5Ba1.5Cu3O6+y reveal successive antiferromagnetic (AF) ordering of the Cu++ spins. The as grown single crystals show an AF structure characterized by a Neel temperature T(N1) approximately 390K and a magnetic wave vector (1/2 1/2 0) referring to the tetragonal structure of NdBa2Cu3O6. As the temperature is lowered below T(N2) approximately 150K, a spin reorientation develops and a second AF ordering with (1/2 1/2 1/2) wave vector is stabilized. When the samples are oxygenated the tetragonal symmetry and the Neel temperature T(N1) remain unchanged, whereas the spin reorientation at T(N2) is suppressed. The results indicate that the Nd/Ba substitution increases the stability of the tetragonal structure upon the oxygen content. This may induce new possibilities of local oxygen ordering that favour the presence of holes in the deficient layer. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH, INST NUKL FESTKORPERPHYS, W-7500 KARLSRUHE 1, GERMANY. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NIPPON TELEGRAPH & TEL PUBL CORP APPL ELECTR LABS, IBARAKI 31911, JAPAN. RP MOUDDEN, AH (reprint author), CENS, CEA, CNRS, LAB LEON BRILLOUIN, F-91191 GIF SUR YVETTE, FRANCE. OI Gehring, Peter/0000-0002-9236-2046 NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1167 EP 1168 DI 10.1016/0921-4534(91)91807-G PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000218 ER PT J AU DEWITT, DR SCHNEIDER, D CLARK, MW CHEN, MH CHURCH, D AF DEWITT, DR SCHNEIDER, D CLARK, MW CHEN, MH CHURCH, D TI DIELECTRONIC-RECOMBINATION CROSS-SECTIONS OF HYDROGENLIKE ARGON SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; EXCITATION; OXYGEN; AUGER AB Relative dielectronic-recombination cross sections for hydrogenlike argon are presented. The contributions of the KLL, KLM, KLN, KLO, and KLP groups of resonances are compared to theoretical calculations. The experimental method consists of the formation and interaction of ions with electrons in an ion trap followed by an analysis of the extracted ions to determine relative yields. Comparison with theory shows that the total cross sections agree within +/- 6%. C1 TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. RP DEWITT, DR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 19 TC 42 Z9 42 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7185 EP 7188 DI 10.1103/PhysRevA.44.7185 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200026 ER PT J AU MEYER, FW OVERBURY, SH HAVENER, CC VANEMMICHOVEN, PAZ BURGDORFER, J ZEHNER, DM AF MEYER, FW OVERBURY, SH HAVENER, CC VANEMMICHOVEN, PAZ BURGDORFER, J ZEHNER, DM TI ELECTRON-EMISSION DURING INTERACTIONS OF MULTICHARGED N AND AR IONS WITH AU(110) AND CU(001) SURFACES SO PHYSICAL REVIEW A LA English DT Article ID METAL-SURFACE; TUNGSTEN SURFACE; AUGER ELECTRONS; SLOW IONS; SOLIDS; NEUTRALIZATION; ATOMS AB We report measurements of energy distributions of electrons emitted during interactions 10q-keV N6+, and Ar(q+) (q = 7,8,9) ions with Au(110) and Cu(001) surfaces at grazing angles. The electron energy distributions have been measured as a function of angle of incidence, observation angle, and target-crystal azimuth. For both Au and Cu targets, the projectile KLL Auger peak observed for the case of the N6+ projectiles is seen to consist of two components whose intensities have strikingly different dependences on incident perpendicular velocity. The main component of the KLL peak is attributed to subsurface electron emission and is modeled using a Monte Carlo simulation of the projectile trajectories in the bulk. The second component, observed only for the smallest incident perpendicular velocities, is attributed to above-surface KLL Auger electron emission and is modeled using computer simulations of the resonance neutralization-autoionization cascade that occurs prior to projectile penetration of the surface. In the case of the Au target, NNV and NVV transitions, attributed to vacancy transfer from the projectile K shell to the N shell of Au, are also observed. The Monte Carlo simulation of the subsurface contribution to the electron emission is able to reproduce the observed angle-of-incidence dependence of both the projectile and the target Auger electron intensities. In addition, it shows reasonable agreement with the observed dependences of the projectile KLL intensity on observation angle and crystal azimuth. C1 UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. RP OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 43 TC 80 Z9 83 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7214 EP 7228 DI 10.1103/PhysRevA.44.7214 PG 15 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200031 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 SO PHYSICAL REVIEW A LA English DT Article ID EXCITED-STATES; DOUBLE IONIZATION; 2-ELECTRON ATOMS; HIGH VELOCITIES; PROTON IMPACT; HELIUM; ANTIPROTONS; SINGLE; CLASSIFICATION; MECHANISMS AB Double-electron-excitation processes of He atoms by proton, antiproton, and C6+-ion impact have been theoretically investigated using the second-order Born approximation and the close-coupling method in the energy regime of MeV/u. The semiclassical impact-parameter method with a straight-line-trajectory approximation is employed to describe the collision processes. Hyperspherical wave functions are adopted to take full account of the strongly correlated motion of two atomic electrons in He. For proton and antiproton impact, it is found that the first-order mechanism dominates for excitation to the (2s2p) 1P(o) excited state, while the second-order processes play a significant role in excitation to the (2s2s) 1S(e), (2p2p)1S(e), and (2p2p) 1D(e) excited states at a few MeV/u. It should be noted that the doubly excited (2s2p) 1P(o) state plays an important role as an intermediate state in these second-order processes in addition to the singly excited 1s2p 1P(o) state. It is also found that the difference for the double-electron-excitation processes by proton impact and by antiproton impact is much smaller than that for the double-ionization processes in this energy range. For the C6+ion impact, higher-order mechanisms play more important roles at a few MeV/u. The excitation mechanism is also discussed based on the classification scheme of the correlation quantum numbers, which enables us to obtain a more direct physical insight into the collision mechanism. 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 CHOFU-GA-OKA,CHOFU,TOKYO 182,JAPAN. NR 29 TC 36 Z9 36 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7234 EP 7242 DI 10.1103/PhysRevA.44.7234 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200033 ER PT J AU WANG, JY REINHOLD, CO BURGDORFER, J AF WANG, JY REINHOLD, CO BURGDORFER, J TI ELECTRON LOSS AT BACKWARD OBSERVATION ANGLES SO PHYSICAL REVIEW A LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; ION-ATOM COLLISIONS; BINARY-ENCOUNTER PEAK; ANGULAR-DISTRIBUTION; ELASTIC-SCATTERING; IONIZATION; HE+; ARGON; PROJECTILE; DEPENDENCE AB A theoretical study of electron emissions resulting from ionzation of light hydrogenlike projectiles in ion (atom)-atom collisions with heavy targets is presented with emphasis on backward observation angles. Angular and energy distributions of the ejected electrons have been calculated with various approximation methods, which agree with or can be traced to the impulse approximation with the exact off-energy-shell transition amplitudes. Comparisons with experimental data have been made for collisions of H0 and He+ with Ar. We find good agreement for both the electron angular distributions and the angular variation of the peak position. Our results show that electron loss at backward angles is dominated by elastic scattering of the projectile electron in the strong field of the heavy target. A reliable representation of the potential and a high-order theory for scattering at this potential are required to describe the experiment accurately. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WANG, JY (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 33 TC 34 Z9 34 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7243 EP 7251 DI 10.1103/PhysRevA.44.7243 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200034 ER PT J AU SHORE, BW BERGMANN, K OREG, J ROSENWAKS, S AF SHORE, BW BERGMANN, K OREG, J ROSENWAKS, S TI MULTILEVEL ADIABATIC POPULATION TRANSFER SO PHYSICAL REVIEW A LA English DT Article ID STIMULATED RAMAN-SCATTERING; VIBRATIONAL LEVELS; 3-LEVEL SYSTEM; PULSES AB We present a theoretical description of a scheme in which coordinated laser pulses transfer population efficiently from any initially populated state (e.g., the ground state) to a multiply excited state of an atom or molecule without producing appreciable population in intermediate states. Our analytic results for multilevel excitation transfer provide a simple yet instructive extension to the counterintuitive pulse sequence studied previously for a three-state system. C1 UNIV KAISERSLAUTERN,DEPT PHYS,W-6750 KAISERSLAUTERN,GERMANY. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. BEN GURION UNIV NEGEV,DEPT PHYS,IL-84105 BEER SHEVA,ISRAEL. RP SHORE, BW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI BERGMANN, KLAAS/D-5543-2011 NR 20 TC 135 Z9 137 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7442 EP 7447 DI 10.1103/PhysRevA.44.7442 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200053 ER PT J AU AMENDT, P LONDON, RA STRAUSS, M AF AMENDT, P LONDON, RA STRAUSS, M TI MODAL STUDY OF THE ROLE OF EXCESS NOISE IN X-RAY LASERS SO PHYSICAL REVIEW A LA English DT Article ID SPONTANEOUS EMISSION FACTOR; HERMITIAN OPTICAL-SYSTEMS; AMPLIFIERS; COHERENCE; BUILDUP AB Current x-ray laser designs rely on amplifying spontaneous emission in a high-temperature plasma. A central problem in the study of x-ray lasers is determining and optimizing the degree of transverse spatial coherence for holographic applications. The inherent non-power-orthogonal character of the normal modes in a general amplifying medium necessarily results in excess noise and cross-correlation effects that can significantly affect the predicted coherence and intensity profiles of an x-ray laser. In particular, loosely bound discrete transverse eigenstates of the paraxial wave equation have previously been found to dominate the intensity and coherence in the low-amplification regime if the continuum eigenstates are omitted from the spectrum [London, Strauss, and Rosen, Phys. Rev. Lett. 65, 563 (1990)]. A detailed analysis of the role of excess noise on steady-state laser intensity and coherence is presented for the simple case of a transverse square gain and density profile in a finite geometry. The inclusion of the continuum portion of the spectrum is found to substantially reduce the level of excess noise and to alter the coherence predictions for low and intermediate gain-length products. C1 NUCL RES CTR NEGEV,DEPT PHYS,IL-84190 BEER SHEVA,ISRAEL. RP AMENDT, P (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 42 TC 27 Z9 27 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7478 EP 7492 DI 10.1103/PhysRevA.44.7478 PG 15 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200056 ER PT J AU PAYNE, MG MILLER, JC HART, RC GARRETT, WR AF PAYNE, MG MILLER, JC HART, RC GARRETT, WR TI EFFECTS OF 4-WAVE-MIXING ON 4-PHOTON RESONANCE EXCITATION AND IONIZATION IN THE PRESENCE OF A 3-PHOTON INTERMEDIATE STATE RESONANCE ENHANCEMENT SO PHYSICAL REVIEW A LA English DT Article ID MULTI-PHOTON IONIZATION; DEPENDENT COOPERATIVE SHIFTS; UNFOCUSED LASER-BEAMS; MULTIPHOTON IONIZATION; 3RD-HARMONIC GENERATION; 4-WAVE-MIXING PROCESSES; HARMONIC-GENERATION; ATOMIC EXCITATION; NOBLE-GASES; INTERFERENCE AB We consider effects which occur when four-wave sum frequency generation and multiphoton ionization are induced by lasers tuned near a three-photon resonance and simultaneously near or at a dipole allowed four-photon resonance. In studies with unfocused laser beams, if the phase mismatch of the generated four-wave-mixing field is large and the related two-photon resonance for the absorption of a four-wave-mixing photon and a laser photon results in strong absorption of the four-wave-mixing field, a coherent cancellation occurs between the pumping of the resonance by two- and four-photon processes. This interference effect occurs when the first laser is tuned on either side of the three-photon resonance and \DELTA-k(r)L\>>1, where DELTA-k(r) is the mismatch and L is the length of the path of the laser beams in the gas. With focused laser beams large differences occur between ionization with unidirectional beams and with counterpropagating laser beams when \DELTA-k(r)b\>>1, where b is the confocal parameter of the focused laser beams. Strong absorption of the four-wave-mixing field is shown not to be necessary for strong destructive interference with focused laser beams when the phase mismatch is large. This work also suggests an explanation for earlier experiments where the presence of a four-photon resonance enabled the generation of third-harmonic light in a positively dispersive wavelength region. We argue that this process can occur when the laser used to achieve the four-photon resonance is focused on the small z (z is the coordinate in the direction of propagation) side of the focal point of the laser responsible for the third-harmonic generation. In this way the absorption of the third-harmonic light on one side of the focal point is made much stronger than on the other side. Correspondingly, contributions to the third-harmonic field from the two sides of the focal point are unequal and cannot undergo complete destructive interference as would otherwise occur in a positively dispersive region. RP PAYNE, MG (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 33 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7684 EP 7701 DI 10.1103/PhysRevA.44.7684 PG 18 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200075 ER PT J AU LIVINGSTON, AE SERPA, FG ZACARIAS, AS CURTIS, LJ BERRY, HG BLUNDELL, SA AF LIVINGSTON, AE SERPA, FG ZACARIAS, AS CURTIS, LJ BERRY, HG BLUNDELL, SA TI LIFETIME MEASUREMENTS IN HIGHLY IONIZED SILICON SO PHYSICAL REVIEW A LA English DT Note ID SPECTROSCOPY; TRANSITIONS; ATOMS AB We report the measurement of excited-state lifetimes in highly ionized silicon atoms using multiplexed detection of a fast-ion beam source. Simultaneous lifetime measurements for resonance transitions and for Rydberg transitions in Si XI and Si XII have been performed. Comparisons with theoretical lifetimes are presented, and good agreement is obtained with a new relativistic many-body calculation of the 2p fine-structure-state lifetimes in lithium-like Si XII. C1 UNIV TOLEDO,DEPT PHYS & ASTRON,TOLEDO,OH 43606. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP LIVINGSTON, AE (reprint author), UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556, USA. NR 15 TC 8 Z9 8 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 DEC 1 PY 1991 VL 44 IS 11 BP 7820 EP 7822 DI 10.1103/PhysRevA.44.7820 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200087 ER PT J AU DECAUX, V BITTER, M HSUAN, H HILL, KW VONGOELER, S PARK, H BHALLA, CP AF DECAUX, V BITTER, M HSUAN, H HILL, KW VONGOELER, S PARK, H BHALLA, CP TI COMPARISON OF EXPLICIT CALCULATIONS FOR N=3-8 DIELECTRONIC SATELLITES OF THE FEXXV K-ALPHA RESONANCE LINE WITH EXPERIMENTAL-DATA FROM THE TOKAMAK FUSION TEST REACTOR SO PHYSICAL REVIEW A LA English DT Note ID X-RAY-SPECTRA; HELIUM-LIKE IONS; SOLAR-FLARE; IRON; SPECTROMETER; TITANIUM AB Dielectronic satellite spectra of the Fe XXX K-alpha resonance line observed from tokamak fusion test reactor plasmas have been compared with recent explicit calculations for the n = 3-8 dielectronic satellites as well as the earlier theoretical predictions, which were based on the 1/n3 scaling law for n > 4 satellites. The analysis has been performed by least-squares fits of synthetic spectra to the experimental data. The synthetic spectra constructed from both theories are in good agreement with the observed data. However, the electron-temperature values obtained from the fit of the present explicit calculations are in better agreement with independent measurements. C1 KANSAS STATE UNIV AGR & APPL SCI,DEPT PHYS,MANHATTAN,KS 66506. RP DECAUX, V (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 23 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP R6987 EP R6989 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200005 ER PT J AU BARBEE, TW COHEN, ML AF BARBEE, TW COHEN, ML TI THEORETICAL-STUDY OF ATOMIC PHASES OF METALLIC HYDROGEN SO PHYSICAL REVIEW B LA English DT Article ID SOLID HYDROGEN; ULTRAHIGH PRESSURES; MOLECULAR-HYDROGEN; GROUND-STATE; TRANSITION; DEUTERIUM; MBAR; SI AB Several structures are considered as candidates for the predicted high-pressure (above 400 GPa) atomic phase of metallic hydrogen. Results for the cubic phases are found to agree well with previous calculations. Two particularly interesting structures are the primitive hexagonal (ph) and rhombohedral (9R), which are found to be particularly stable and may be good candidates for the structure of atomic metallic hydrogen. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. NR 31 TC 30 Z9 30 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 21 BP 11563 EP 11568 DI 10.1103/PhysRevB.44.11563 PG 6 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100001 ER PT J AU MAILHIOT, C MCMAHAN, AK AF MAILHIOT, C MCMAHAN, AK TI ATMOSPHERIC-PRESSURE STABILITY OF ENERGETIC PHASES OF CARBON SO PHYSICAL REVIEW B LA English DT Article ID STRUCTURAL-PROPERTIES; ELECTRONIC-PROPERTIES; SI; DIAMOND; SILICON; GE; PSEUDOPOTENTIALS; GRAPHITE; STRESS; SPACE AB The stability of various energetic phases of carbon is investigated with the use of ab initio pseudopotential total-energy methods. In particular, we examine the atmospheric-pressure stability of the fourfold-coordinated bc8 phase of carbon against transformations to graphitic and diamond structures lying at lower energy. A group-theoretical analysis is used to determine high-symmetry transformation paths to these low-energy structures. Ab initio total-energy calculations are then carried out along those paths characterized by minimal bond breaking to identify minimum-energy configurational transformations. In all cases we find energy barriers inhibiting transformation from the bc8 structure to the lower-energy phases, with the smallest barrier being approximately 0.2 eV/atom and occurring along specific paths to the graphitic forms of carbon. Consequently, it appears that bc8 carbon should be metastable at atmospheric pressure against spontaneous transformation to the lower-energy observed phases. In contrast, we find three metallic high-coordination forms of carbon (face-centered cubic, hexagonal close-packed, and body-centered cubic) to be mechanically unstable against spontaneous transformation to the cubic diamond structure. RP UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 41 TC 74 Z9 75 U1 2 U2 5 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 DEC 1 PY 1991 VL 44 IS 21 BP 11578 EP 11591 DI 10.1103/PhysRevB.44.11578 PG 14 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100003 ER PT J AU BOERCKER, DB AF BOERCKER, DB TI CONSTANT-PRESSURE SIMULATION OF CARBON IN THE BC8 STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID SILICON; SI AB The recent interest in thin films of diamond and diamondlike carbon provides the stimulus for investigating metastable phases of carbon that might be observed in the growth of such films. In this paper we use an empirical potential suggested by Tersoff to perform constant-pressure molecular-dynamics simulations of carbon in the bc8 structure and observe its transformation to graphite. Our results are consistent with predictions based upon total-energy calculations of the barrier height and transition path between the two structures. RP BOERCKER, DB (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 10 TC 13 Z9 13 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 DEC 1 PY 1991 VL 44 IS 21 BP 11592 EP 11596 DI 10.1103/PhysRevB.44.11592 PG 5 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100004 ER PT J AU DEJUS, RJ LEPOIRE, DJ SUSMAN, S VOLIN, KJ PRICE, DL AF DEJUS, RJ LEPOIRE, DJ SUSMAN, S VOLIN, KJ PRICE, DL TI DYNAMICS OF VITREOUS AG-GE-SE SO PHYSICAL REVIEW B LA English DT Article ID INTERMEDIATE-RANGE ORDER; CHALCOGENIDE GLASSES; GERMANIUM DISELENIDE; MOLTEN; GESE2 AB The dynamic scattering function S (Q, E) for vitreous g-Ag4Ge3Se9 at T = 15 K has been measured by time-of-flight inelastic neutron scattering using an incident energy of approximately 60 meV. The neutron measurements have been complemented by room-temperature Raman-scattering measurements. The data are presented and discussed in terms of the elastic structure factor S(el)(Q), the total structure factor S(Q), the neutron-weighted generalized one-phonon vibrational density of states (GVDOS), and the Q dependence of the dynamic structure factor S(Q,E) at selected energy excitations. Comparisons are made with experimental results for pure GeSe2 glass, and with calculations based on the method of normal-mode analysis to interpret the data. The introduction of Ag into the Ge-Se glassy network has a profound effect on the vibrational spectrum and the intermediate-range order. The GeSe4/2 tetrahedron, however, generally accepted as the local structural element of pure GeSe2 glass, remains a valid structural component also in the heavily Ag-doped glass. We find that the so-called companion line in the Raman spectrum for g-GeSe2 disappears upon doping with Ag, indicating a change of the intermediate-range order. Moreover, there is a large increase in the population of vibrational modes below approximately 200 cm-1 in both the GVDOS and the Raman spectrum. These modes can be associated with vibrational modes of Ag atoms interacting with three Se in a nearly planar pyramidal arrangement. We derive 30 kdyn/cm for the Ag-Se stretching constant. RP DEJUS, RJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Price, David Long/A-8468-2013 NR 17 TC 17 Z9 17 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 DEC 1 PY 1991 VL 44 IS 21 BP 11705 EP 11713 DI 10.1103/PhysRevB.44.11705 PG 9 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100018 ER PT J AU BAKER, DB CONRADI, MS FEDDERS, PA NORBERG, RE TORGESON, DR BARNES, RG BOWMAN, RC AF BAKER, DB CONRADI, MS FEDDERS, PA NORBERG, RE TORGESON, DR BARNES, RG BOWMAN, RC TI ENHANCEMENT OF NUCLEAR-SPIN CROSS-RELAXATION IN METAL-HYDROGEN SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; PROTON; MOTION AB A cross-relaxation model has previously been proposed to explain the anomalous frequency dependence of proton relaxation rates R1 in several metal-hydrogen systems at low temperatures. We report two experiments that test and unambiguously confirm the cross-relaxation model. The first experiment uses large-amplitude field modulation to sweep the proton resonance through the inhomogeneously broadened spectrum of metal resonances. The second involves rotation of the sample to sweep the metal resonances through the proton line. In both experiments, the protons are brought into spin thermal contact with an increased number of metal nuclei. Sample rotation rates of only 10 Hz increase the proton R1 by a factor of 50 for the TaHx system. A simple model explains the variation of R1 with rotation speed. Both techniques reveal increased proton relaxation rates R1, unique signatures of the cross-relaxation model. A model is presented that explains the weaker than linear temperature dependence of R1. The role of disorder on a length scale of 500, angstrom or less is emphasized. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. AEROJET ELECTR SYST DIV,AZUSA,CA 91702. RP BAKER, DB (reprint author), WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130, USA. OI Bowman, Robert/0000-0002-2114-1713 NR 29 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 21 BP 11759 EP 11766 DI 10.1103/PhysRevB.44.11759 PG 8 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100023 ER PT J AU DEMELO, CARS AF DEMELO, CARS TI SQUEEZED BOSON STATES IN CONDENSED MATTER SO PHYSICAL REVIEW B LA English DT Article ID MINIMUM-UNCERTAINTY PACKETS; EQUIVALENCE CLASSES; COHERENT STATES; NOISE; LIGHT AB The possibility of the existence of squeezed states in interacting-boson condensed-matter systems is studied. These states are intimately related to the Bogoliubov and Valatin-Butler wave functions, and they are constructed as a possible ground state for the attractive-interaction Bose problem (AIBP) in a lattice, in which pair states can be formed. The pair ground state is constructed as variational many-body wave function for the AIBP by exploring the analogies with the dynamically generated photon squeezed states of quantum optics. The possible existence of these boson squeezed states is discussed in the context of biexcitons. In order to characterize the statistical properties of the pair (squeezed) state, the boson-field amplitude fluctuations, number probability distribution, and the second-order correlation function are calculated. RP DEMELO, CARS (reprint author), ARGONNE NATL LAB,DIV MAT SCI,SCI & TECHNOL CTR SUPERCONDUCT,BLDG 223,ROOM B237,ARGONNE,IL 60439, USA. NR 30 TC 8 Z9 8 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 DEC 1 PY 1991 VL 44 IS 21 BP 11911 EP 11917 DI 10.1103/PhysRevB.44.11911 PG 7 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100041 ER PT J AU LIU, C BADER, SD AF LIU, C BADER, SD TI ABSENCE OF FERROMAGNETISM IN EPITAXIAL-FILMS OF ULTRATHIN PD, RH, AND RH ON PD GROWN ON AU(100) SO PHYSICAL REVIEW B LA English DT Note ID MONTE-CARLO; MAGNETISM; SURFACES; OVERLAYERS; INTERFACES; MONOLAYERS; SANDWICHES; TRANSITION; AG(100); METALS AB In situ longitudinal and polar Kerr-effect measurements were used to search for ferromagnetism in films of Pd/Au(100), Rh/Au(100), and Rh/Pd/Au(100) with overlayer thicknesses of 0.5-5 monolayers (ML). No evidence for ferromagnetism was found in these systems above 100 K and for applied magnetic fields up to 2.2 kOe. Based on our low-energy-electron-diffraction and Auger data, we find that all three systems grow epitaxially, and that there is layer-by-layer growth for Pd/Au(100) at 300 K, layer growth for Rh/Au(100) at 100 K up to 2 ML followed by island formation, and layer growth for Rh/Pd/Au(100) at 100 K. RP LIU, C (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 32 TC 55 Z9 55 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 21 BP 12062 EP 12065 DI 10.1103/PhysRevB.44.12062 PG 4 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100067 ER PT J AU SHEN, ZX DESSAU, DS WELLS, BO OLSON, CG MITZI, DB LOMBADO, L LIST, RS ARKO, AJ AF SHEN, ZX DESSAU, DS WELLS, BO OLSON, CG MITZI, DB LOMBADO, L LIST, RS ARKO, AJ TI EVIDENCE OF CHEMICAL-POTENTIAL SHIFT WITH HOLE DOPING IN BI2SR2CACU2O8+DELTA SO PHYSICAL REVIEW B LA English DT Note ID ANGLE-RESOLVED-PHOTOEMISSION; ELECTRONIC-STRUCTURE; PHOTOELECTRON-SPECTROSCOPY; SINGLE-CRYSTALS; CU-O; SUPERCONDUCTORS; LA2-XSRXCUO4; GAP AB We have performed photoemission studies on high-quality Bi2Sr2CaCu2O8+delta samples with various-delta. Our results show a clear chemical-potential shift (0.15-0.2 eV) as a function of doping. This result and the existing angle-resolved-photoemission data give a rather standard doping behavior of this compound in its highly doped regime. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP SHEN, ZX (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. RI Mitzi, David/B-6260-2012 OI Mitzi, David/0000-0001-5189-4612 NR 23 TC 42 Z9 44 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 21 BP 12098 EP 12101 DI 10.1103/PhysRevB.44.12098 PG 4 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100077 ER PT J AU TRALSHAWALA, N ZASADZINSKI, JF COFFEY, L HUANG, Q AF TRALSHAWALA, N ZASADZINSKI, JF COFFEY, L HUANG, Q TI INTERPRETATION OF RESISTIVITY OF ND1.85CE0.15CUO4-Y USING THE ELECTRON-PHONON SPECTRAL-FUNCTION DETERMINED FROM TUNNELING DATA SO PHYSICAL REVIEW B LA English DT Note ID NORMAL-STATE; TEMPERATURE; SCATTERING; ND2-XCEXCUO4-Y; TRANSPORT; METALS AB Tunneling measurements of alpha-2F(omega) of Nd1.85Ce0.15CuO4-y, are shown to be in good agreement with recent published results of the phonon density of states F(omega) from neutron scattering. The locations of peaks and valleys in both functions are similar but the spectral weights differ suggesting that alpha-2 has a strong energy dependence. We have used alpha-2F(omega) to estimate the phonon Contribution, rho(phonon)(T), to published data of the temperature-dependent resistivity, rho(T), for thin films and single crystals of Nd1.85Ce0.15CuO4-7. When the phonon contribution is subtracted from the experimental data, a clear T2 Contribution remains over most of the temperature range. The T2 contribution is interpreted to be due to three-dimensional electron-electron scattering, rho(e-e). There is also a correlation between the magnitude of rho(e-e), and the value of the plasma frequency, omega(p) [obtained from the determination of rho(phonon)(T)], with a scaling which approximates omega(p)-10/3. Such a scaling is expected from the carrier concentration dependence of electron-electron scattering. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP IIT, DEPT PHYS, CHICAGO, IL 60616 USA. NR 15 TC 23 Z9 23 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 21 BP 12102 EP 12105 DI 10.1103/PhysRevB.44.12102 PG 4 WC Physics, Condensed Matter SC Physics GA GT901 UT WOS:A1991GT90100078 ER PT J AU HAN, JW TORGESON, DR BARNES, RG PETERSON, DT AF HAN, JW TORGESON, DR BARNES, RG PETERSON, DT TI ANOMALOUS PROTON-SPIN LATTICE-RELAXATION AT HIGH-TEMPERATURES IN ZIRCONIUM DIHYDRIDES SO PHYSICAL REVIEW B LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; METAL-HYDROGEN SYSTEMS; ELECTRONIC-STRUCTURE; PULSED NMR; DIFFUSION; HYDRIDES; TIME; ZRHX AB Measurements of the proton-spin-lattice relaxation rate R1 are reported for zirconium dihydrides, ZrHx (1.58 less-than-or-equal-to x less-than-or-equal-to 1.98), with emphasis on the behavior of R1 at high temperatures (to 1300 K). An anomalously sharp increase in R1 is found at all hydrogen concentrations at temperatures above approximately 900 K. At the onset temperature T(c) for anomalous R1 behavior, defined as that of the intermediate R1 minimum, the hydrogen hopping rate v(c) congruent-to 10(9)-10(10) s-1, decreasing with increasing hydrogen concentration x. The anomalous behavior depends only weakly on resonance frequency and shows no correlation with the pronounced peak in the electronic density of states at x congruent-to 1.80. No differences were found in the behavior of pure and impurity-doped (Cr, Mn, Fe) samples. The anomalous contribution to R1 is described by R1x = A' exp(-U/k(B)T), with U congruent-to 0.4 - 1.0 eV/atom. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES LAB,AMES,IA 50011. 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 22 BP 12353 EP 12360 DI 10.1103/PhysRevB.44.12353 PG 8 WC Physics, Condensed Matter SC Physics GA GT902 UT WOS:A1991GT90200024 ER PT J AU TESANOVIC, Z AF TESANOVIC, Z TI NATURE OF THE SUPERCONDUCTING TRANSITION IN THE PRESENCE OF A MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; PERTURBATION-SERIES; FLUX LATTICE; HC2; FLUCTUATIONS; BEHAVIOR; ORDER AB The critical fluctuations in type-II superconductors exhibit certain universal features due to the constraint on the form of the order parameter imposed by the external magnetic field. The critical behavior is represented by an interacting particle system with long-ranged multiple-body forces. The superconducting transition corresponds to the liquid-solid transition in this dense vortex plasma and, in the properly scaled form, is always far from the mean field H(c2)(T). C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP TESANOVIC, Z (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. NR 21 TC 40 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1991 VL 44 IS 22 BP 12635 EP 12638 DI 10.1103/PhysRevB.44.12635 PG 4 WC Physics, Condensed Matter SC Physics GA GT902 UT WOS:A1991GT90200071 ER PT J AU MCNAUGHTON, MW KOCH, K SUPEK, I TANAKA, N MCNAUGHTON, KH RILEY, PJ AMBROSE, DA JOHNSON, JD SMITH, A GLASS, G HIEBERT, JC NORTHCLIFFE, LC SIMON, AJ ADAMS, DL RANSOME, RD CLAYTON, DB SPINKA, HM JEPPESON, RH TRIPARD, GE AF MCNAUGHTON, MW KOCH, K SUPEK, I TANAKA, N MCNAUGHTON, KH RILEY, PJ AMBROSE, DA JOHNSON, JD SMITH, A GLASS, G HIEBERT, JC NORTHCLIFFE, LC SIMON, AJ ADAMS, DL RANSOME, RD CLAYTON, DB SPINKA, HM JEPPESON, RH TRIPARD, GE TI NP ELASTIC SPIN TRANSFER MEASUREMENTS AT 788 MEV SO PHYSICAL REVIEW C LA English DT Article ID C ANALYZING POWER; CORRELATION PARAMETER; INTERMEDIATE ENERGIES; CROSS-SECTION; PHASE-SHIFTS; P-P; SCATTERING; POLARIMETER; POLARIZATION; KNN AB We have measured the spin-transfer parameters K(LL), K(SL), K(LS), and K(SS) at 788 MeV from 47-degrees to 177-degrees c.m., and also uncovered a 10-16 % normalization discrepancy which affects all previous np elastic spin data from LAMPF. Results disagree significantly from previous phase-shift predictions. With the inclusion of these new data the NN phase shifts and amplitudes (isospin 0 and 1) become well determined for the first time near 800 MeV. C1 UNIV TEXAS,AUSTIN,TX 78712. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. RICE UNIV,HOUSTON,TX 77251. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV MONTANA,MISSOULA,MT 59812. WASHINGTON STATE UNIV,PULLMAN,WA 99164. RP MCNAUGHTON, MW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 53 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 DEC PY 1991 VL 44 IS 6 BP 2267 EP 2275 DI 10.1103/PhysRevC.44.2267 PG 9 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300005 ER PT J AU HOREN, DJ BERTRAND, FE BEENE, JR SATCHLER, GR MITTIG, W VILLARI, ACC SCHUTZ, Y WENLONG, Z PLAGNOL, E GILLIBERT, A AF HOREN, DJ BERTRAND, FE BEENE, JR SATCHLER, GR MITTIG, W VILLARI, ACC SCHUTZ, Y WENLONG, Z PLAGNOL, E GILLIBERT, A TI ISOSPIN CHARACTER OF THE GIANT QUADRUPOLE TRANSITION IN SN-124 SO PHYSICAL REVIEW C LA English DT Article ID COUPLED-CHANNELS CALCULATIONS; INELASTIC ALPHA SCATTERING; MONOPOLE RESONANCE; COLLECTIVE STATES; CORE POLARIZATION; PB-208; EXCITATION; NUCLEI; PION; SN AB Use has been made of the interference between the nuclear and Coulomb amplitudes in the scattering of 84 MeV/nucleon O-17 ions by Sn-124 to study the isospin character of the giant quadrupole transition. The data are well described by assuming the transition is "isoscalar," i.e., M(n)/M(p) = N/Z. This is in disagreement with the results of pi+/pi- scattering on Sn-118 and recent (e,e'n) measurements on Sn-116. Cross sections for excitation of the 2+ state at 1.132 MeV, 3- state at 2.614 MeV, and giant monopole resonance are included with corresponding coupled-channels calculations. C1 GRAND ACCELERATEUR NATL IONS LOURDS,F-14021 CAEN,FRANCE. CENS,DEPT PHYS NUCL BASSE ENERGIE,F-91191 GIF SUR YVETTE,FRANCE. RP HOREN, DJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 25 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2385 EP 2389 DI 10.1103/PhysRevC.44.2385 PG 5 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300016 ER PT J AU LINDGREN, RA CLAUSEN, BL BLANPIED, GS HERNANDEZ, J MISHRA, CS MIZE, WK WHISNANT, CS RITCHIE, BG MORRIS, CL SEESTROMMORRIS, SJ MOORE, CF SEIDL, PA WILDENTHAL, BH GILMAN, R CARR, JA AF LINDGREN, RA CLAUSEN, BL BLANPIED, GS HERNANDEZ, J MISHRA, CS MIZE, WK WHISNANT, CS RITCHIE, BG MORRIS, CL SEESTROMMORRIS, SJ MOORE, CF SEIDL, PA WILDENTHAL, BH GILMAN, R CARR, JA TI PION-SCATTERING TO 6- STRETCHED STATES IN MG-24 AND MG-26 SO PHYSICAL REVIEW C LA English DT Article ID PARTICLE-HOLE STATES; SAXON WAVE-FUNCTIONS; ELECTRON-SCATTERING; INELASTIC-SCATTERING; FRAGMENTATION; TRANSITIONS; STRENGTH; SI-28 AB Inelastic pi +/- cross-section measurements at pion incident energies of 150 and 180 MeV were made on 6- states in Mg-24, Mg-26. In particular, we have determined the (f7/2d5/2(-1))6- isoscalar Z0 = 0.21 +/- 0.02 strength for the strongest T = 0, J-pi = 6- state located at 12.11 +/- 0.05 MeV in Mg-24, and the isoscalar Z0 = 0.17 +/- 0.04 and isovector Z1 = 0.21 +/- 0.02 strength for the strongest T = 1, J-pi = 6- state located at 9.18 MeV in Mg-26. The distorted-wave impulse-approximation pion cross-section calculations required a multiplicative normalization factor of 1.2 +/- 0.1 in order to reproduce the pure isovector strength deduced from electron scattering for the well-known T = 1, J-pi = 6- state at 15.15 MeV in Mg-24 and the T = 2, J-pi = 6- state at 18.05 MeV in Mg-26. C1 UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. UNIV S CAROLINA,COLUMBIA,SC 29208. ARIZONA STATE UNIV,TEMPE,AZ 85287. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV TEXAS,AUSTIN,TX 78712. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PENN,PHILADELPHIA,PA 19104. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. RP LINDGREN, RA (reprint author), UNIV VIRGINIA,INST NUCL & PARTICLE PHYS,CHARLOTTESVILLE,VA 22901, USA. OI Clausen, Benjamin Leroy/0000-0001-9894-7830 NR 26 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2413 EP 2418 DI 10.1103/PhysRevC.44.2413 PG 6 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300019 ER PT J AU MISHRA, V BOUKHAROUBA, N GRIMES, SM DOCTOR, K PEDRONI, RS HAIGHT, RC AF MISHRA, V BOUKHAROUBA, N GRIMES, SM DOCTOR, K PEDRONI, RS HAIGHT, RC TI DETERMINATION OF THE LEVEL DENSITY OF SI-29 FROM ERICSON FLUCTUATIONS SO PHYSICAL REVIEW C LA English DT Article ID SCATTERING AB Neutron total cross-section measurements for Si-28 have been made with the white neutron source at Los Alamos Meson Physics Facility for neutron energies between 4 and 600 MeV. Very good resolution (almost-equal-to 0.2 ns/m) was obtained. The detailed structure at low energies is found to be different than obtained in previous measurements, although at energies 7 < E(n) < 15 MeV the agreement is quite good. The cross section becomes quite smooth above 15 MeV. An Ericson analysis is performed to yield values for the level density of Si-29 between 13 and 22 MeV. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP MISHRA, V (reprint author), OHIO UNIV,ATHENS,OH 45701, USA. NR 28 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2419 EP 2425 DI 10.1103/PhysRevC.44.2419 PG 7 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300020 ER PT J AU ODONNELL, JM FORTUNE, HT ROST, E AF ODONNELL, JM FORTUNE, HT ROST, E TI O+ AND 2+ STRENGTHS IN PION DOUBLE CHARGE-EXCHANGE TO DOUBLE GIANT-DIPOLE RESONANCES SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING BOSON MODEL; DEFORMED-NUCLEI; SCATTERING; ENERGIES; STATES AB Coupled-channel optical-model calculations are presented for pion double charge exchange (DCX) to the double giant-dipole resonance (DD). Systematic formulas for the transition matrix element to the giant-dipole resonance are presented. The calculations reproduce the available single-charge-exchange data. No further normalization is required to reproduce the DCX data. A smaller 0+ strength to the DD is calculated than previously expected. The quality of the calculation is reminiscent of that found for similar calculations to the double isobaric analog state. C1 UNIV PENN,PHILADELPHIA,PA 19104. UNIV COLORADO,BOULDER,CO 80302. RP ODONNELL, JM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 27 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2426 EP 2429 DI 10.1103/PhysRevC.44.2426 PG 4 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300021 ER PT J AU JOHNSON, MB OSET, E SARAFIAN, H SICILIANO, ER VICENTEVACAS, M AF JOHNSON, MB OSET, E SARAFIAN, H SICILIANO, ER VICENTEVACAS, M TI MESON EXCHANGE CURRENTS IN PION DOUBLE CHARGE-EXCHANGE SO PHYSICAL REVIEW C LA English DT Article ID NUCLEAR SHELL-MODEL; SCATTERING; C-14 AB We examine the influence of meson exchange currents (MEC) on pion double charge exchange (DCX) using the Weinberg Lagrangian. We calculate the corresponding amplitude for DCX and examine its interplay with more conventional mechanisms of DCX for C-14 at incident energies of 10 to 110 MeV and for the Ca isotopes at 35 MeV. The MEC effect includes the pion pole term and the contact term. In comparison to previous estimates, we find smaller but nevertheless non-negligible contributions of these effects to DCX. We stress the fact that the MEC contribution to DCX is strongly A dependent, with its effect in light nuclei comparatively larger than in heavy ones. C1 UNIV VALENCIA,CONSEJO SUPER INVEST CIENTIFICAS,CTR MIXTO,DEPT THEORET PHYS,E-46100 BURJASSOT,SPAIN. PENN STATE UNIV,YORK,PA 17403. UNIV VALENCIA,CONSEJO SUPER INVEST CIENTIFICAS,CTR MIXTO,INST FIS CORPUSCULAR,E-46100 BURJASSOT,SPAIN. RP JOHNSON, MB (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Vicente Vacas, Manuel Jose/K-4326-2014 OI Vicente Vacas, Manuel Jose/0000-0001-7266-5480 NR 25 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2480 EP 2483 DI 10.1103/PhysRevC.44.2480 PG 4 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300029 ER PT J AU UMAR, AS STRAYER, MR WU, JS DEAN, DJ GUCLU, MC AF UMAR, AS STRAYER, MR WU, JS DEAN, DJ GUCLU, MC TI NUCLEAR HARTREE-FOCK CALCULATIONS WITH SPLINES SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; SELF-CONSISTENT; SKYRMES INTERACTION; EFFECTIVE FORCES; MEAN-FIELD; O-16+O-16; APPROXIMATION; DISSIPATION; CA-40+CA-40; DYNAMICS AB We present the numerical details for performing static Hartree-Fock and time-dependent Hartree-Fock calculations using a spline collocation method. Calculations are performed on a three-dimensional Cartesian lattice without any symmetry assumptions and quantal degeneracies. The three-dimensional Hartree-Fock calculations are compared with the solutions of the corresponding radial equations. The results demonstrate an unprecedented accuracy for relatively coarse meshes. We also present a zero impact parameter, time-dependent Hartree-Fock calculation for the O-16+O-16 system. C1 VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. RP UMAR, AS (reprint author), OAK RIDGE NATL LAB,DIV PHYS,CTR COMPUTATIONALLY INTENS PHYS,OAK RIDGE,TN 37831, USA. RI Umar, Ahmet/J-4125-2013; OI Umar, Ahmet/0000-0002-9267-5253; Dean, David/0000-0002-5688-703X NR 32 TC 36 Z9 36 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2512 EP 2521 DI 10.1103/PhysRevC.44.2512 PG 10 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300034 ER PT J AU DANZMANN, K MEYERHOF, WE BELKACEM, A MONTENEGRO, EC DILLARD, E HULSKOTTER, HP GUARDALA, N SPOONER, DW KOTLINSKI, B CLINE, D KAVKA, A BEAUSANG, CW BURDE, J MCDONALD, RJ MACCHIAVELLI, AO RUDE, BS MOLITORIS, JD AF DANZMANN, K MEYERHOF, WE BELKACEM, A MONTENEGRO, EC DILLARD, E HULSKOTTER, HP GUARDALA, N SPOONER, DW KOTLINSKI, B CLINE, D KAVKA, A BEAUSANG, CW BURDE, J MCDONALD, RJ MACCHIAVELLI, AO RUDE, BS MOLITORIS, JD TI SEARCH FOR NARROW-PEAK STRUCTURE IN THE 3-PHOTON SPECTRUM FROM 6-MEV NUCLEON U+TH, U+U, AND TH+TH COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; PARTICLES; POSITRON; LINES; RESONANCES; SYSTEMS; DECAY AB We have searched for three-photon decays produced in 6-MeV/nucleon U+Th, Th+Th, and U+U collisions. We see no evidence for narrow lines corresponding to the electron-positron lines seen by others: in the summed-energy region between 1.2 and 2.0 MeV, we set an upper limit for the cross section of 3 x 10(-28) cm2 averaged over a target thickness of 1 mg/cm2. C1 MAX PLANCK INST QUANTUM OPT,W-8046 GARCHING,GERMANY. UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. RP DANZMANN, K (reprint author), STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305, USA. NR 21 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2584 EP 2587 DI 10.1103/PhysRevC.44.2584 PG 4 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300042 ER PT J AU HELMER, KG WU, CY CLINE, D DELEPLANQUE, MA DIAMOND, RM KAVKA, AE KERNAN, WJ LIU, XT MACCHIAVELLI, AO MCDONALD, RJ RASMUSSEN, JO STEPHENS, FS STOYER, MA VOGT, EG AF HELMER, KG WU, CY CLINE, D DELEPLANQUE, MA DIAMOND, RM KAVKA, AE KERNAN, WJ LIU, XT MACCHIAVELLI, AO MCDONALD, RJ RASMUSSEN, JO STEPHENS, FS STOYER, MA VOGT, EG TI POPULATION OF HIGH-SPIN STATES IN U-234 BY HEAVY-ION-INDUCED TRANSFER-REACTIONS SO PHYSICAL REVIEW C LA English DT Article ID TRANSFER CROSS-SECTIONS; PROJECTILES; NUCLEON AB The one-neutron pickup reaction U-235(Pb-206, Pb-207)U-234 at a laboratory energy of 1394 MeV was used to investigate the influence of collective motion at high spin on the single-particle nature of transfer reactions in the actinide region. Deexcitation gamma-rays were measured using a particle-particle-gamma triple-coincidence method. The decay scheme of the reaction products was identified using p-gamma-gamma coincidences. Rotational states up to 28+(30+) were seen in U-234. A comparison of rotational state population in both the p-gamma-ray singles and the p-gamma-gamma coincidences is also made between data from the above reaction and from the reaction U-235(Ni-58, Ni-59)U-234 (E(lab) = 325 MeV). For each system, angular distributions for both inelastic excitation and transfer are presented and one-neutron transfer reaction cross sections as well as grazing angles have been extracted. The reaction cross sections are compared to a recent semiclassical calculation based on Q(gg) systematics. The present study demonstrates the feasibility of using heavy-ion-induced transfer reactions for spectroscopic studies. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. RP HELMER, KG (reprint author), UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627, USA. NR 15 TC 6 Z9 6 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2598 EP 2601 DI 10.1103/PhysRevC.44.2598 PG 4 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300044 ER PT J AU ALBRECHT, R AWES, TC BAKTASH, C BECKMANN, P BERGER, F BOCK, R CLAESSON, G CLEWING, G DRAGON, L EKLUND, A FERGUSON, RL FRANZ, A GARPMAN, S GLASGOW, R GUSTAFSSON, HA GUTBROD, HH IDH, J JACOBS, P KAMPERT, KH KOLB, BW KRISTIANSSON, P LEE, Y LOEHNER, H LUND, I OBENSHAIN, FE OSKARSSON, A OTTERLUND, L PERTZMANN, T PERSSON, S PLASIL, F POSKANZER, AM PURSCHKE, M RITTER, HG SAINI, S SANTO, R SCHMIDT, HR SIEMIARCZUK, T SORENSEN, SP STENLUND, E TINCKNELL, ML YOUNG, GR AF ALBRECHT, R AWES, TC BAKTASH, C BECKMANN, P BERGER, F BOCK, R CLAESSON, G CLEWING, G DRAGON, L EKLUND, A FERGUSON, RL FRANZ, A GARPMAN, S GLASGOW, R GUSTAFSSON, HA GUTBROD, HH IDH, J JACOBS, P KAMPERT, KH KOLB, BW KRISTIANSSON, P LEE, Y LOEHNER, H LUND, I OBENSHAIN, FE OSKARSSON, A OTTERLUND, L PERTZMANN, T PERSSON, S PLASIL, F POSKANZER, AM PURSCHKE, M RITTER, HG SAINI, S SANTO, R SCHMIDT, HR SIEMIARCZUK, T SORENSEN, SP STENLUND, E TINCKNELL, ML YOUNG, GR TI DISTRIBUTIONS OF TRANSVERSE ENERGY AND FORWARD ENERGY IN 0-16 INDUCED AND S-32-INDUCED HEAVY-ION COLLISIONS AT 60A AND 200A GEV SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; MULTISTRING MODEL VENUS; EXPERIMENT WA80; PROTON-NUCLEUS; CERN; FLUCTUATIONS; CALORIMETER; SCATTERING; EMULSION; REGION AB Distributions of transverse energy, forward energy, and dE(T)/d-eta from 60A and 200A GeV O-16-induced and 200A GeV S-32-induced nuclear collision with C, Al, Cu, Ag, and Au are presented. The energy, projectile, target, and centrality dependences are shown and discussed within a simple Glauber spectator-participant model. Two universal parametrizations of the dE(T)/d-eta distributions are presented together with various estimates of the nuclear stopping power and attained energy densities. An upper limit for gamma-direct/pi-0 in central collisions of 200A GeV S-32 + Au-197 is derived. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV MUNSTER, W-4400 MUNSTER, GERMANY. UNIV LUND, S-22101 LUND, SWEDEN. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV TENNESSEE, KNOXVILLE, TN 37996 USA. RP ALBRECHT, R (reprint author), GESELL SCHWERIONENFORSCH GMBH, W-6100 DARMSTADT 11, GERMANY. RI Lohner, Herbert/B-2397-2014 OI Lohner, Herbert/0000-0002-7441-739X NR 40 TC 50 Z9 50 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 EI 1089-490X J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2736 EP 2752 DI 10.1103/PhysRevC.44.2736 PG 17 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300057 ER PT J AU KOEHLER, PE GRAFF, SM AF KOEHLER, PE GRAFF, SM TI O-17(N,ALPHA)C-14 CROSS-SECTION FROM 25 MEV TO APPROXIMATELY 1 MEV SO PHYSICAL REVIEW C LA English DT Article ID HADRON PHASE-TRANSITION; THERMONUCLEAR REACTION-RATES; BARYON-NUMBER FLUCTUATIONS; BIG-BANG NUCLEOSYNTHESIS; PRIMORDIAL NUCLEOSYNTHESIS; NEUTRON DIFFUSION; HEAVY-ELEMENTS; EARLY UNIVERSE; INHOMOGENEITY AB We have measured the O-17(n,alpha)C-14 cross section from thermal energy to approximately 1 MeV. A bump in the data near 3 keV could be fitted by a state whose properties are consistent with a known subthreshold J-pi = 1- level at E(x) = 8.039 MeV. The cause of the 1/upsilon cross section near thermal energy could not be determined although the known 2+ state at 8.213 MeV was found to be too narrow to contribute much to the thermal cross section. Our data are compared to measurements made via the inverse reaction. There are many differences between the two sets of data. The astrophysical reaction rate was calculated from the measured cross section. This reaction plays a role in the nucleosynthesis of heavy elements in nonstandard big-bang models. At big-bang temperatures, the experimental rate was found to be in fair agreement with the rate estimated from the previously known properties of states of O-18 in this region. Furthermore, using the available information from experiments, it was estimated that the O-17(n,alpha)C-14 rate is approximately a factor of 10(3)-10(4) times larger than the O-17(n,gamma)O-18 rate at big-bang temperatures. As a result, there may be significant cycling between C-14 and O-17 resulting in a reduction of heavy-element nucleosynthesis. RP KOEHLER, PE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,GRP P-17,LOS ALAMOS,NM 87545, USA. OI Koehler, Paul/0000-0002-6717-0771 NR 34 TC 29 Z9 29 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2788 EP 2793 DI 10.1103/PhysRevC.44.2788 PG 6 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300062 ER PT J AU LING, A ASLANOGLOU, X BRADY, FP FINLAY, RW HAIGHT, RC HOWELL, CR KING, NSP LISOWSKI, PW PARK, BK RAPAPORT, J ROMERO, JL SORENSON, DS TORNOW, W ULLMANN, JL AF LING, A ASLANOGLOU, X BRADY, FP FINLAY, RW HAIGHT, RC HOWELL, CR KING, NSP LISOWSKI, PW PARK, BK RAPAPORT, J ROMERO, JL SORENSON, DS TORNOW, W ULLMANN, JL TI GROUND-STATE GAMOW-TELLER STRENGTH IN NI-64(N,P)CO-64 CROSS-SECTIONS AT 90-240 MEV SO PHYSICAL REVIEW C LA English DT Article ID BETA-DECAY; ELECTRON-CAPTURE; NEUTRON; SCATTERING; EQUATION; NUCLEI; SUPERNOVAE; EXCITATION; COLLAPSE; EXCHANGE AB Cross sections have been measured for the reaction Ni-64(n,p)Co-64 laboratory angles between 0-degrees and 10-degrees for incident neutron energies from 90 to 240 MeV. The ground-state cross sections together with the beta- decay ft value for the transition Co-64Co(g.s.)-->Ni-64(g.s.) are used to normalize the q = 0 differential cross section in units of mb/sr per unit Gamow-Teller (GT) strength. This is the first absolute measurement of the A(n,p) unit cross section for a nucleus in the (fp) shell, and it may be used to calibrate the GT strength measured in other (n,p) reactions of similar mass nuclei. Since the (e-,nu-e) channel involves the same nuclear matrix element as the (n,p) channel, knowledge of GT strength in these nuclei is important for supernova modeling codes which depend on knowledge of e- capture rates of (fp)-shell nuclei to determine parameters of stellar core collapse. C1 OHIO UNIV,ATHENS,OH 45701. UNIV CALIF DAVIS,DAVIS,CA 95616. DUKE UNIV,DURHAM,NC 27706. TRIANGLE UNIV NUCL LAB,DURHAM,NC 27706. RP LING, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 43 TC 15 Z9 15 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2794 EP 2800 DI 10.1103/PhysRevC.44.2794 PG 7 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300063 ER PT J AU LESKO, KT NORMAN, EB LARIMER, RM SUR, B AF LESKO, KT NORMAN, EB LARIMER, RM SUR, B TI LU-176 - AN UNRELIABLE S-PROCESS CHRONOMETER SO PHYSICAL REVIEW C LA English DT Article ID CAPTURE CROSS-SECTIONS; BETA-DECAY RATES; NEUTRON-CAPTURE; PROCESS NUCLEOSYNTHESIS; COSMIC CLOCK; NUCLEI; MODEL AB A level scheme of Lu-176 up to approximately 1400 keV excitation energy is deduced from a gamma-gamma coincidence experiment and previously published particle transfer data. 170 gamma-ray transitions are placed between 85 levels. We identify 27 previously unknown levels and 131 previously unknown transitions in Lu-176. With this gamma-ray data we place the energy of the isomer at 122.9 keV. A level at 838.5 keV (J-pi = 5-, t1/2 < 10 ns) is found to decay with substantial strength to both the ground state (7-, 4.08 x 10(10) yr) and the 122.9 keV isomer (1-, 3.7 hr). The presence of this level guarantees the thermal equilibrium of Lu-176g,m for T greater-than-or-equal-to 3 x 10(8) K and therefore during s-process nucleosynthesis. The resulting temperature sensitivity of its effective half-life rules out the use of Lu-176 as an s-process chronometer. The use of Lu-176 to determine s-process temperatures is discussed. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. RP LESKO, KT (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 31 TC 26 Z9 26 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2850 EP 2864 DI 10.1103/PhysRevC.44.2850 PG 15 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300066 ER PT J AU KNUDSON, JN MORRIS, CL BOWMAN, JD SAILOR, WC SEESTROM, SJ SUPEK, I SADLER, ME ISENHOWER, LD AF KNUDSON, JN MORRIS, CL BOWMAN, JD SAILOR, WC SEESTROM, SJ SUPEK, I SADLER, ME ISENHOWER, LD TI SEARCH FOR NEUTRAL PIONS FROM THE SPONTANEOUS FISSION OF CF-252 SO PHYSICAL REVIEW C LA English DT Note ID NATURAL RADIOACTIVITY; GROUND-STATE; EMISSION AB A search for pi-0,s arising from the spontaneous fission of Cf-252 using the LAMPF pi-0 spectrometer has yielded no evidence for this process. We obtain an upper limit of 1.4 x 10(11) with a 90% confidence level for the branching ratio of pi-0,s produced at rest in the spontaneous fission of Cf-252. C1 RUDJER BOSKOVIC INST,YU-41001 ZAGREB,YUGOSLAVIA. ABILENE CHRISTIAN UNIV,ABILENE,TX 79699. RP KNUDSON, JN (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 20 TC 5 Z9 5 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1991 VL 44 IS 6 BP 2869 EP 2871 DI 10.1103/PhysRevC.44.2869 PG 3 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300068 ER PT J AU SOBOTKA, LG GALLAMORE, L CHBIHI, A SARANTITES, DG STRACENER, DW BAUER, W BOWMAN, DR CARLIN, N DESOUZA, RT GELBKE, CK GONG, WG HANNUSCHKE, S KIM, YD LYNCH, WG RONNINGEN, R TSANG, MB ZHU, F BEENE, JR HALBERT, ML THOENNESSEN, M AF SOBOTKA, LG GALLAMORE, L CHBIHI, A SARANTITES, DG STRACENER, DW BAUER, W BOWMAN, DR CARLIN, N DESOUZA, RT GELBKE, CK GONG, WG HANNUSCHKE, S KIM, YD LYNCH, WG RONNINGEN, R TSANG, MB ZHU, F BEENE, JR HALBERT, ML THOENNESSEN, M TI PARTICLE MULTIPLICITY DEPENDENCE OF HIGH-ENERGY PHOTON PRODUCTION IN A HEAVY-ION REACTION SO PHYSICAL REVIEW C LA English DT Note ID GAMMA-RAY EMISSION; ELECTROMAGNETIC BREMSSTRAHLUNG; CHARGED-PARTICLE; COLLISIONS; MEV/NUCLEON AB The production of high-energy photons in an intermediate energy heavy-ion reaction (65 MeV/nucleon Ar-40 + Nb-93) is studied by characterizing the events, which produce the photons, by the forward and backward, light and heavy, charged particle production. While the absolute yield of high energy photons increases with increasing charged particle multiplicity, the spectral shape is found to be almost independent of multiplicity. This indicates that the fundamental photon production mechanism is insensitive to the impact parameter but that the production process is more probable for the more violent collisions. This is expected for an incoherent nucleon-nucleon bremstrahlung mechanism but not for a statistical mechanism. This work also provides a comparison of two observables that have been suggested as impact parameter selectors: the high-energy photon yield and the charged particle multiplicity. We find that the photon yield, binned by particle mutiplicity, does not scale as would be expected if both techniques truly measured the impact parameter. This observation can be explained by large fluctuations in the particle multiplicity at fixed impact parameter. C1 MICHIGAN STATE UNIV, NATL SUPERCONDUCTING CYCLOTRON LAB, E LANSING, MI 48824 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. RP SOBOTKA, LG (reprint author), MICHIGAN STATE UNIV, DEPT PHYS, E LANSING, MI 48824 USA. RI Carlin Filho, Nelson/C-2187-2012; Lynch, William/I-1447-2013; deSouza, Romualdo/P-5862-2015 OI Lynch, William/0000-0003-4503-176X; deSouza, Romualdo/0000-0001-5835-677X NR 23 TC 10 Z9 10 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 DEC PY 1991 VL 44 IS 6 BP R2257 EP R2261 PG 5 WC Physics, Nuclear SC Physics GA GV153 UT WOS:A1991GV15300003 ER PT J AU HO, PM LONGO, MJ NGUYEN, A LUK, KB JAMES, C RAMEIKA, R DURYEA, J GUGLIELMO, G HELLER, K JOHNS, K DIEHL, HT TEIGE, S THOMSON, GB ZOU, Y AF HO, PM LONGO, MJ NGUYEN, A LUK, KB JAMES, C RAMEIKA, R DURYEA, J GUGLIELMO, G HELLER, K JOHNS, K DIEHL, HT TEIGE, S THOMSON, GB ZOU, Y TI MEASUREMENT OF THE POLARIZATION AND MAGNETIC-MOMENT OF XI-BAR+ ANTIHYPERONS PRODUCED BY 800-GEV/C PROTONS SO PHYSICAL REVIEW D LA English DT Article ID INCLUSIVE HADRON-PRODUCTION; PRECISE MEASUREMENT; 400-GEV PROTONS; HIGH-ENERGIES; HYPERON; LAMBDA; ASYMMETRY; MODEL AB The polarization of XIBAR+ hyperons produced by 800-GeV/c protons in the inclusive reaction p + Be --> XIBAR+ + X has been measured using a sample of 70 000 XIBAR+ decays. The average polarization of the XIBAR+, at a mean chi(F) = 0.39 and p(t) = 0.76 GeV/c, is -0.097 +/- 0.012 +/- 0.009, compared to -0.102 +/- 0.012 +/- 0.010 for the XIBAR-. The large polarization found for the XIBAR+ is not expected in any model for polarization of inclusively produced hyperons. The magnetic moment of the XIBAR+ was measured to be 0.657 +/- 0.028 +/- 0.020 nuclear magnetons (mu(N)), Compared to (-0.674 +/- 0.021 +/- 0.020)mu(N) for the XIBAR-, in good agreement with CPT invariance. C1 UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08854. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 34 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3402 EP 3418 DI 10.1103/PhysRevD.44.3402 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400006 ER PT J AU YEHUDAI, E AF YEHUDAI, E TI PROBING W-GAMMA COUPLINGS USING GAMMA-GAMMA-]W+W- SO PHYSICAL REVIEW D LA English DT Article ID COLLIDING BEAMS; PAIR PRODUCTION; MOMENT AB We examine the process gamma-gamma --> W+W- in the context of a gamma-gamma-collider constructed by backscattering laser light off the electron beams of a 500-GeV e+e- collider. We present analytic formulas for the helicity amplitudes with general kappa and lambda-anomalous couplings. We calculate the effective cross section, accounting for the photon spectrum and including polarization effects. Finally, we assess the sensitivity of this experiment, and compare with those of other experiments running at a comparable energy. RP YEHUDAI, E (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 19 TC 65 Z9 65 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3434 EP 3444 DI 10.1103/PhysRevD.44.3434 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400009 ER PT J AU KRONFELD, AS NIZIC, B AF KRONFELD, AS NIZIC, B TI NUCLEON COMPTON-SCATTERING IN PERTURBATIVE QCD SO PHYSICAL REVIEW D LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; SCALING LAWS; FORM-FACTORS; SUM-RULES; PROTON; ENERGIES; MOMENTUM AB We have computed the helicity amplitudes for the reactions gamma-N --> gamma-N (N = p,n) at large momentum transfer to lowest order in perturbative QCD. Our cross section for proton Compton scattering shows good qualitative agreement with experimental data, when the proton is modeled by the Chernyak-Oglobin-Zhitnitsky, King-Sachrajda, or Gari-Stefanis distribution amplitude. Discrepancies between our results and previous calculations seem to be due to different treatments of numerical integration around singularities. C1 RUDJER BOSKOVIC INST,YU-41001 ZAGREB,YUGOSLAVIA. RP KRONFELD, AS (reprint author), FERMI NATL ACCELERATOR LAB,THEORET PHYS GRP,POB 500,BATAVIA,IL 60510, USA. OI Kronfeld, Andreas/0000-0003-2716-1149 NR 26 TC 59 Z9 59 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3445 EP 3465 DI 10.1103/PhysRevD.44.3445 PG 21 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400010 ER PT J AU OHNEMUS, J AF OHNEMUS, J TI ORDER-ALPHA-S CALCULATION OF HADRONIC W+/-Z PRODUCTION SO PHYSICAL REVIEW D LA English DT Article ID LEADING-LOGARITHM CALCULATION; FERMILAB TEVATRON; WEAK INTERACTIONS; PHOTON PRODUCTION; PAIR PRODUCTION; QCD CORRECTIONS; PARTIAL WIDTHS; MASS; BOSON; SCATTERING AB An order-alpha(s) calculation of pp((-)) --> W +/- Z + X is presented. Results are given for the total cross section and differential distributions for Fermilab Tevatron, CERN Large Hadron Collider, and Superconducting Super Collider energies. The calculation utilizes a combination of analytic and Monte Carlo integration methods which makes it easy to calculate a variety of observables and to impose experimental cuts. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP OHNEMUS, J (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 45 TC 83 Z9 83 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3477 EP 3489 DI 10.1103/PhysRevD.44.3477 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400013 ER PT J AU WANG, XN GYULASSY, M AF WANG, XN GYULASSY, M TI HIJING - A MONTE-CARLO MODEL FOR MULTIPLE JET PRODUCTION IN PP, PA, AND AA COLLISIONS SO PHYSICAL REVIEW D LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; RISING CROSS-SECTIONS; HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; GEV CM ENERGY; HADRON-NUCLEUS; FRAGMENTATION MODEL; SMALL VALUES; E+E-PHYSICS; PT JETS AB Combining perturbative-QCD inspired models for multiple jet production with low p(T) multistring phenomenology, we develop a Monte Carlo event generator HIJING to study jet and multiparticle production in high energy pp, pA, and AA collisions. The model includes multiple minijet production, nuclear shadowing of parton distribution functions, and a schematic mechanism of jet interactions in dense matter. Glauber geometry for multiple collisions is used to calculate p A and AA collisions. The phenomenological parameters are adjusted to reproduce essential features of pp multiparticle production data for a wide energy range (square-root s = 5-2000 GeV). Illustrative tests of the model on p + A and light-ion B + A data at square-root s = 20 GeV/nucleon and predictions for Au + Au at energies of the BNL Relativistic Heavy Ion Collider (square-root s = 200 GeV/nucleon) are given. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 84 TC 1084 Z9 1093 U1 0 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3501 EP 3516 DI 10.1103/PhysRevD.44.3501 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400015 ER PT J AU BIJNENS, J DAWSON, S VALENCIA, G AF BIJNENS, J DAWSON, S VALENCIA, G TI GAMMA-GAMMA-]PI-0-PI-0 AND KL-]PI-0-GAMMA-GAMMA IN THE CHIRAL QUARK-MODEL SO PHYSICAL REVIEW D LA English DT Article ID RADIATIVE KAON DECAYS; PERTURBATION-THEORY; CP VIOLATION; LAGRANGIANS; KL->PI-0E+E; COLLISIONS; EXCHANGE; PHOTON; LOOP AB We consider the process gamma-gamma --> pi-0-pi-0 within the quark model. We find small corrections to the lowest-order result obtained from chiral loops. These corrections are very similar to those found in vector-meson-dominated models, and too small to be tested with the present data. We use this result, together with a simple pole model, to find the amplitude for K(L) --> pi-0-gamma-gamma and use this to estimate the CP-conserving part of K(L) --> pi-0e+e-. For this last process we find a branching ratio approximately 2.3 X 10(-13), significantly smaller than the CP-violating contribution. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP BIJNENS, J (reprint author), CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. OI Bijnens, Johan/0000-0002-1618-2844 NR 35 TC 34 Z9 34 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3555 EP 3561 DI 10.1103/PhysRevD.44.3555 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400019 ER PT J AU RIZZO, TG AF RIZZO, TG TI SINGLE CHARGED-HIGGS-BOSON PRODUCTION IN Z-DECAYS SO PHYSICAL REVIEW D LA English DT Article ID CP CONSERVATION; MODELS; CONSTRAINTS; VIOLATION AB The possibility that a charged Higgs boson with a mass in excess of half the mass of the Z and a significant branching fraction into tau-leptons may be observable in high statistics experiments at the CERN e+e- collider LEP is examined. In the class of models we study, the potential search range can reach masses as high as 80 GeV given an event sample of 10(7) Z's. 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), UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706, USA. NR 22 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3599 EP 3602 DI 10.1103/PhysRevD.44.3599 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400024 ER PT J AU ARNOLD, P VOKOS, S AF ARNOLD, P VOKOS, S TI INSTABILITY OF HOT ELECTROWEAK THEORY - BOUNDS ON MH AND MT SO PHYSICAL REVIEW D LA English DT Article ID HIGH-TEMPERATURE; STANDARD MODEL; FINITE TEMPERATURES; QUARK MASSES; VACUUM; CONSTRAINTS; BEHAVIOR; BOSON AB The electroweak vacuum need not be absolutely stable. For certain top-quark and Higgs-boson masses in the minimal standard model, it is instead metastable with a lifetime exceeding the present age of the Universe. The decay of our vacuum may be nucleated at low temperature by quantum tunneling or at high temperature by thermal excitation. We show that the requirement that the vacuum survive the high temperatures of the early Universe places the strongest constraints from vacuum stability on the top-quark and Higgs-boson masses in the minimal standard model. If a single Higgs boson is found experimentally, these constraints may place an upper bound on the scale of new physics beyond the minimal standard model. In contrast with other work, we examine temperatures very large compared to the scale of weak symmetry restoration and find much stronger bounds. We also present a simple analytic approximation that directly relates the bounds to the running coupling constants of the minimal standard model. RP ARNOLD, P (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 29 TC 49 Z9 49 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3620 EP 3627 DI 10.1103/PhysRevD.44.3620 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400027 ER PT J AU SUZUKI, M AF SUZUKI, M TI MODEL OF A COMPOSITE RIGHT-HANDED T-QUARK - AN ALTERNATIVE TO THE TTBAR CONDENSATE MODEL SO PHYSICAL REVIEW D LA English DT Article ID DYNAMIC SYMMETRY-BREAKING; STANDARD MODEL; HIGGS BOSONS; MASS AB As an alternative to the composite Higgs-boson model with a ttBAR condensate, a solvable model is built in which a right-handed t quark is a composite of left-handed quarks and elementary Higgs particles. This model leads us to virtually the same numerical prediction on low-energy parameters; e.g., the t-quark mass and the Higgs-boson mass as the composite Higgs-boson model, when the renormalization-group analysis is performed according to the prescription of Bardeen, Hill, and Lindner. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SUZUKI, M (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 21 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 DEC 1 PY 1991 VL 44 IS 11 BP 3628 EP 3634 DI 10.1103/PhysRevD.44.3628 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400028 ER PT J AU CAHN, RN SUZUKI, M AF CAHN, RN SUZUKI, M TI ELECTROWEAK CORRECTIONS IN THE NONMINIMAL TECHNICOLOR MODEL SO PHYSICAL REVIEW D LA English DT Article ID SYMMETRY-BREAKING; PARAMETERS AB The electroweak radiative corrections induced by a one-family technicolor model are examined using the dispersion relation technique proposed by Peskin and Takeuchi. Large uncertainties in DELTA-r remain because its value is sensitive to the masses of the technipions and technirho. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP CAHN, RN (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 13 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3641 EP 3645 DI 10.1103/PhysRevD.44.3641 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400030 ER PT J AU ARNOLD, PB MATTIS, MP AF ARNOLD, PB MATTIS, MP TI PEACE IN THE VALLEY - CONCORDANT APPROACHES TO DISTORTED INSTANTONS SO PHYSICAL REVIEW D LA English DT Article ID BARYON-NUMBER; ENERGY; AMPLITUDES AB There are two competing technologies for computing the distorted instantons relevant to anomalous high-energy scattering, the "R-term method" and the "valley method", both designed for the calculation of final-state corrections. We show that, when restricted to final-state corrections, the two methods are formally equivalent at all orders. The proof makes use of Cutkosky's cutting rules, appropriately extended to apply to perturbation theory in instanton backgrounds. However, the distinction that has come to be drawn between initial-state and final-state corrections to the total anomalous cross section sigma(anom) is ambiguous, as it depends on one's choice of Faddeev-Popov constraints (zero modes or otherwise) necessary to render perturbation theory around the instanton well defined. We discuss the relationship between the constraint choices in the two methods. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET T8,LOS ALAMOS,NM 87545. RP ARNOLD, PB (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 32 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3650 EP 3660 DI 10.1103/PhysRevD.44.3650 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400032 ER PT J AU CLOSE, FE MILNER, RG AF CLOSE, FE MILNER, RG TI PROBING THE POLARIZED SEA BY INCLUSIVE LEPTOPRODUCTION OF HADRONS SO PHYSICAL REVIEW D LA English DT Note ID INELASTIC MUON SCATTERING; PROTON; SPIN AB We give predictions for the inclusive production of pi and K in polarized leptoproduction from polarized nucleons. As E(pi,K)lab --> 0 the hadron inclusive asymmetry equals that of the total cross section; for E(pi,K)lab > 0 new information obtains. We show that these processes can provide sensitive tests for a polarized sea in a polarized nucleon. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. MIT,NUCL SCI LAB,CAMBRIDGE,MA 02139. RP CLOSE, FE (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 15 TC 40 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP 3691 EP 3694 DI 10.1103/PhysRevD.44.3691 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400037 ER PT J AU ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOTT, JR ESCOBAR, CO GIBNEY, MC HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T PINFOLD, J PUNKAR, G PUROHIT, MV ROSS, WR SANTORO, AFS SCHMIDT, DM SHOUP, AL SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS AF ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOTT, JR ESCOBAR, CO GIBNEY, MC HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T PINFOLD, J PUNKAR, G PUROHIT, MV ROSS, WR SANTORO, AFS SCHMIDT, DM SHOUP, AL SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS TI MEASUREMENT OF THE DECAYS D0-]PI-PI+ AND D0-]K-K+ SO PHYSICAL REVIEW D LA English DT Note ID D0 AB Using data from Fermilab photoproduction experiment E691, we measure the ratio of branching fractions between the Cabibbo-suppressed modes B(D0 --> K-K+)/B(D0 --> pi--pi+) to be 1.95 +/- 0.34 +/- 0.22. We also report branching fractions for the modes D0 --> K-K+ and D0 --> pi--pi+ relative to the Cabibbo-allowed decay D0 --> K--pi+. Furthermore, we place an upper limit of 0.45 at the 90% C.L. on the CP-violating asymmetry in D0 --> K-K+ vs D0BAR --> K-K+ decays. C1 CARLETON UNIV,OTTAWA K1S 5B6,ONTARIO,CANADA. CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO DE JANEIRO,BRAZIL. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV COLORADO,BOULDER,CO 80309. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV SAO PAULO,SAO PAULO,BRAZIL. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. YALE UNIV,NEW HAVEN,CT 06511. UNIV MISSISSIPPI,OXFORD,MS 38677. RP ANJOS, JC (reprint author), UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106, USA. RI Anjos, Joao/C-8335-2013 NR 11 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1991 VL 44 IS 11 BP R3371 EP R3374 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GT644 UT WOS:A1991GT64400001 ER PT J AU VOGEL, EM WEBER, MJ KROL, DM AF VOGEL, EM WEBER, MJ KROL, DM TI NONLINEAR OPTICAL PHENOMENA IN GLASS SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Review ID SEMICONDUCTOR-DOPED GLASSES; PHOTOINDUCED 2ND-HARMONIC GENERATION; LASER-INDUCED GRATINGS; ULTRAVIOLET-LIGHT PHOTOSENSITIVITY; REFRACTIVE-INDEX MEASUREMENTS; COLOR-CENTER DYNAMICS; BORIC-ACID GLASS; WAVE-GUIDES; SINGLE-MODE; HARMONIC-GENERATION AB The nonlinear optical properties of glass have recently become the focus of growing scientific and technological interest. Nonlinear properties include intensity-dependent refractive index, multiphoton absorption, second and third harmonic generation, stimulated Raman and Brillouin scattering, and associated phenomena such as self-focusing, self-phase modulation, optical phase conjugation, and optical bistability. We report on a large amount of work that reaches beyond simple glasses such as silica. Nonlinear optical phenomena have been investigated in materials ranging from oxide, halide, and chalcogenide glasses to glasses doped with semiconductor microcrystals, organic dyes, and metal particles and in forms varying from bulk materials to optical fibres and waveguides. We also discuss recently discovered photoinduced effects in glass fibres, which include second harmonic generation and the formation of refractive index gratings. The ability to tailor the nonlinear optical properties of glass has been utilised in such diverse applications as controlling beam breakup in high power lasers, demonstration of all-optical devices for switching and logic, ultra short-pulse generation, and ultra long distance soliton transmission. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP VOGEL, EM (reprint author), BELL COMMUN RES INC,TECH STAFF CHEM & MAT SCI RES,RED BANK,NJ 07701, USA. NR 195 TC 340 Z9 343 U1 7 U2 66 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD DEC PY 1991 VL 32 IS 6 BP 231 EP 254 PG 24 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA HA213 UT WOS:A1991HA21300001 ER PT J AU ARUNASALAM, V AF ARUNASALAM, V TI MAPPING IN INERTIAL FRAMES SO PHYSICS ESSAYS LA English DT Article DE INERTIAL FRAME MAPPING; WORLD SPACE MAPPING; WORLD SPACE SYMMETRY; LORENTZ-COVARIANT MAPPINGS; COVARIANT SYMMETRY OPERATIONS; COVARIANCE PRINCIPLE; COVARIANT WORLD PARTY; NONCOVARIANCE OF PARITY; NONCOVARIANCE OF TIME REVERSAL; NONCOVARIANCE OF SIMULTANEITY AB World space mapping in inertial frames is used to examine the Lorentz covariance of symmetry operations. It is found that the Galilean-invariant concepts of simultaneity (S), space-reversal symmetry or parity (P), and time-reversal symmetry (T) are not Lorentz-covariant concepts for inertial observers. That is, just as the concept of simultaneity has no significance independent of the Lorentz inertial frame, likewise so are the concepts of parity and time reversal. This result is contrary to the usual belief. However, the world parity (W) [i.e., the space-time reversal symmetry (PT)] is a truly Lorentz-covariant concept. Indeed, it is shown that only those mapping matrices M that commute with Einstein's Lorentz transformation matrix L (i.e., [M,L] = 0) are the ones that correspond to manifestly Lorentz-covariant operations. This result is in accordance with the spirit of the world space Mach principle. Since the Lorentz transformation is an orthogonal transformation, while the Galilean transformation is not an orthogonal transformation, the formal relativistic space-time mapping theory used here does not have a corresponding nonrelativistic counterpart. RP ARUNASALAM, V (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU UNIV TORONTO PRESS INC PI ONTARIO PA JOURNALS DEPT, 5201 DUFFERIN ST, ONTARIO NORTH YORK M3H 5T8, CANADA SN 0836-1398 J9 PHYS ESSAYS JI Phys. Essays PD DEC PY 1991 VL 4 IS 4 BP 596 EP 606 PG 11 WC Physics, Multidisciplinary SC Physics GA GT574 UT WOS:A1991GT57400012 ER PT J AU KERSTEIN, AR AF KERSTEIN, AR TI FLAPPING MODEL OF SCALAR MIXING IN TURBULENCE SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Letter ID GRID TURBULENCE; LAYER AB Motivated by the fluctuating plume model of turbulent mixing downstream of a point source, a flapping model is formulated for application to other configurations. For the scalar mixing layer, simple expressions for single-point scalar fluctuation statistics are obtained that agree with measurements. For a spatially homogeneous scalar mixing field, the family of probability density functions previously derived using mapping closure is reproduced. It is inferred that single-point scalar statistics may depend primarily on large-scale flapping motions in many cases of interest, and thus that multipoint statistics may be the principal indicators of finer-scale mixing effects. RP KERSTEIN, AR (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 17 TC 11 Z9 11 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD DEC PY 1991 VL 3 IS 12 BP 2838 EP 2840 DI 10.1063/1.858174 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA GT358 UT WOS:A1991GT35800002 ER PT J AU MONDT, JP WEILAND, J AF MONDT, JP WEILAND, J TI COLLISIONLESS 2-FLUID THEORY OF TOROIDAL ETA-I STABILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ENERGY CONFINEMENT; DRIFT MODES; TRANSPORT; TOKAMAKS; PLASMAS; DRIVEN AB A collisionless two-fluid theory based on a 14-moment generalization of the "double-adiabatic" equations is developed to lowest order in the Larmor radius parameter, and applied to derive the toroidal eta(i) stability boundary for all values of the ratio of the density gradient scale length divided by the field curvature length. The present model is an improvement over existing two-fluid models in view of the collisionless nature of the eta(i) instability, while retaining the advantage over kinetic theory of the practicability of mode-coupling simulations. The linear stability boundary, linear growth rate, and real frequency agree fairly accurately with drift-kinetic theory. C1 CHALMERS UNIV TECHNOL,INST ELECTROMAGNET FIELD THEORY,S-41296 GOTHENBURG,SWEDEN. NFR ASSOCIAT,EURATOM,GOTHENBURG,SWEDEN. RP MONDT, JP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 19 TC 15 Z9 15 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1991 VL 3 IS 12 BP 3248 EP 3254 DI 10.1063/1.859755 PG 7 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600004 ER PT J AU HEGNA, CC BHATTACHARJEE, A EFTHIMION, PC AF HEGNA, CC BHATTACHARJEE, A EFTHIMION, PC TI BOOTSTRAP CURRENT AND WARE PINCH IN DRIFT-WAVE TURBULENT TRANSPORT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; TOROIDAL PLASMAS; TOKAMAKS; FLUCTUATIONS; CONFINEMENT; INSTABILITY; RESISTIVITY; STABILITY; MODES; FIELD AB Quasilinear theory is used to calculate contributions to the bootstrap current, Ware pinch, and parallel resistivity due to drift-wave fluctuations. It is shown that drift-wave oscillations can produce large anomalous cross-field fluxes, but have little effect on parallel transport. Specifically, the anomaly in the bootstrap current and Ware pinch is proportional to the spectral average of k perpendicular-to, k parallel-to, which vanishes because of the parity properties of the drift-wave eigenfunction. Implications for recent perturbative experiments on tokamak fusion test reactor (TFTR) [ Phys. Rev. Lett. 66, 421 (1990)] are discussed. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. RP HEGNA, CC (reprint author), COLUMBIA UNIV,DEPT APPL PHYS,NEW YORK,NY 10027, USA. NR 33 TC 2 Z9 2 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1991 VL 3 IS 12 BP 3263 EP 3270 DI 10.1063/1.859757 PG 8 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600006 ER PT J AU COWLEY, SC AF COWLEY, SC TI STABILITY OF HIGH-BETA LARGE-ASPECT-RATIO TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID BALLOONING MODES; BOUNDARIES; PRESSURE; PLASMAS AB High-beta (beta much greater than epsilon/q2) large-aspect-ratio (epsilon much less than 1) tokamak equilibria are shown to be always stable to ideal magnetohydrodynamics (MHD) modes that are localized about a flux surface. Both the ballooning and interchange modes are shown to be stable. This work uses the analytic high-beta large-aspect-ratio tokamak equilibria developed by Cowley et al. [Phys. Fluids B 3, 2069 ( 1991)], which are valid for arbitrary pressure and safety factor profiles. The stability results make no assumption about these profiles nor the shape of the boundary. RP COWLEY, SC (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 19 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1991 VL 3 IS 12 BP 3357 EP 3362 DI 10.1063/1.859767 PG 6 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600017 ER PT J AU COHEN, RH ROGNLIEN, TD AF COHEN, RH ROGNLIEN, TD TI GRADIENT EFFECTS ON INTENSE, PULSED ELECTRON-CYCLOTRON-WAVE ABSORPTION AND CURRENT DRIVE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID HARMONIC OVERLAP; HIGH TE AB Gradients along the magnetic field of the parallel index of refraction N parallel-to or the magnetic-field strength B can substantially alter the dynamics of electrons subjected to intense, pulsed electron-cyclotron waves. Electrons trapped in a phase-space island, or "bucket," about a cyclotron resonance tend to remain trapped and be accelerated with the bucket as N parallel-to and B change. The process can result in a substantial increase in the opacity (with the optical thickness possibly exceeding the linear value) and an improvement in the efficiency with which current can be driven in a tokamak. In this paper, a semiquantitative theory for the absorption and current-drive efficiency is developed and compared with numerical calculations from a multiparticle orbit code. Applications to heating and current drive in present and future tokamaks are discussed. RP COHEN, RH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1991 VL 3 IS 12 BP 3406 EP 3421 DI 10.1063/1.859771 PG 16 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600021 ER PT J AU DRAKE, RP KAUFFMAN, RL LASINSKI, BF CABLE, MD SUTER, LJ ZE, F AF DRAKE, RP KAUFFMAN, RL LASINSKI, BF CABLE, MD SUTER, LJ ZE, F TI THE ANGULAR-DEPENDENCE OF THE ABSORPTION OF 0.35 MU-M LASER-LIGHT BY HIGH-Z, LASER-PRODUCED PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID DISK TARGETS; RAMAN-SCATTERING; WAVELENGTH; SIDESCATTERING; BACKSCATTER; INTENSITY AB Experiments to study the angular dependence of laser-light absorption in long-scale-length, planar plasmas are reported. Flat-topped, 1 nsec pulses of 0.35-mu-m laser light, with up to 2.5 kJ at average laser intensities of 3 X 10(13) to 6 X 10(15) W/cm2, were used to irradiate thick, gold targets at angles of incidence of 0-degrees to > 50-degrees. The scattered light was measured using a number of diagnostics, and the absorption was inferred from these measurements. The absorption decreased somewhat with increasing laser intensity, typically remaining above 90% for laser intensities below 10(15) W/cm2, and was very weakly dependent upon the angle of incidence. Modeling of the reflected light was used to constrain the properties of the plasma and of the reflecting mechanism. No simple model of a single mechanism is consistent with all aspects of the data. RP DRAKE, RP (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Drake, R Paul/I-9218-2012 OI Drake, R Paul/0000-0002-5450-9844 NR 23 TC 4 Z9 5 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1991 VL 3 IS 12 BP 3477 EP 3484 DI 10.1063/1.859776 PG 8 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600026 ER PT J AU HOPKINS, JC MOORE, N AF HOPKINS, JC MOORE, N TI THORN,ROBERT,N. - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual RP HOPKINS, JC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1991 VL 44 IS 12 BP 97 EP 98 DI 10.1063/1.2810376 PG 2 WC Physics, Multidisciplinary SC Physics GA GV836 UT WOS:A1991GV83600016 ER PT J AU THRALL, BD RAHA, GA SPRINGER, DL MEADOWS, GG AF THRALL, BD RAHA, GA SPRINGER, DL MEADOWS, GG TI DIFFERENTIAL SENSITIVITIES OF MURINE MELANOCYTES AND MELANOMA-CELLS TO BUTHIONINE SULFOXIMINE AND ANTICANCER DRUGS SO PIGMENT CELL RESEARCH LA English DT Article DE MELANOMA; MELANOCYTES; GLUTATHIONE; DRUG RESISTANCE ID GLUTATHIONE DEPLETION; CYTO-TOXICITY; OXIDIZED GLUTATHIONE; MULTIDRUG RESISTANCE; MALIGNANT-MELANOMA; OXIDATIVE STRESS; THIOL COMPOUNDS; TUMOR-CELLS; RAT; TRANSFERASE AB High levels of intracellular glutathione (GSH) may result in resistance of tumor cells to cytotoxic drugs. Because of the innate refractory nature of melanoma cells to chemotherapy, we have used a syngeneic murine system consisting of nontumorigenic Mel-ab melanocytes, tumorigenic H-ras-transformed melanocytes (C9.1), and the highly metastatic BL6 melanoma cells to examine the GSH content, glutathione S-transferase (GST) activity, and sensitivity to buthionine sulfoximine (BSO) and other cytotoxic drugs. Compared to the nontumorigenic melanocytes, both C9.1 and BL6 melanoma cells have nearly fivefold higher GSH content, and BL6 cells have increased GST activity. C9.1 and BL6 cells are more resistant to the cytotoxic effects of BCNU and adriamycin; however, the degrees of resistance do not reflect the increased GSH content in these cells. Pretreatment. of BL6 melanoma cells with 50-mu-M BSO depleted over 90% of their GSH content and enhanced the growth-inhibitory effects of L-dopa methylester, BCNU, bleomycin, and dacarbazine. Exposure to BSO alone was not toxic to the tumor cells for up to 24 hr, hut was significantly cytotoxic in the melanocytes after 9 hr. The sensitivity of these cells to BSO appears to depend on a critical level of GSH depletion which is not related to the initial GSH content. These studies suggest that the resistance of melanoma cells to cytotoxic drugs is only partially attributed to changes in the GSH system caused during cellular transformation. C1 WASHINGTON STATE UNIV, COLL PHARM, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, GRAD PROGRAM PHARMACOL TOXICOL, PULLMAN, WA 99164 USA. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. FU NCI NIH HHS [CA42465] NR 32 TC 19 Z9 19 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0893-5785 J9 PIGM CELL RES JI Pigm. Cell. Res. PD DEC PY 1991 VL 4 IS 5-6 BP 234 EP 239 DI 10.1111/j.1600-0749.1991.tb00446.x PG 6 WC Cell Biology; Dermatology SC Cell Biology; Dermatology GA HP601 UT WOS:A1991HP60100006 PM 1823927 ER PT J AU ORBOVIC, V POFF, KL AF ORBOVIC, V POFF, KL TI KINETICS FOR PHOTOTROPIC CURVATURE BY ETIOLATED SEEDLINGS OF ARABIDOPSIS-THALIANA SO PLANT PHYSIOLOGY LA English DT Article ID HYPOCOTYLS; LIGHT; COLEOPTILES; CLINOSTAT; BLUE AB An infrared-imaging system has been used to study the influence of gravity on the kinetics of first positive phototropism. The development of phototropic curvature of etiolated seedlings of Arabidopsis thaliana was measured in the absence of visible radiation. Following a pulse of blue light, stationary seedlings curved to a maximum of approximately 16-degrees about 80 minutes after stimulation. The seedlings then curved upward again or straightened by about 6-degrees during the subsequent 100 minutes. Seedlings rotated on a clinostat reached a similar maximum curvature following photostimulation. These seedlings maintained that curvature for 30 to 40 minutes before subsequently straightening to the same extent as the stationary seedlings. It is concluded that straightening is not a consequence of gravitropism, although gravity has some effect on the phototropism kinetics. C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. RP POFF, KL (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. FU NIDCR NIH HHS [DE-ACO2-76ERO-1338] NR 18 TC 11 Z9 12 U1 0 U2 3 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD DEC PY 1991 VL 97 IS 4 BP 1470 EP 1475 DI 10.1104/pp.97.4.1470 PG 6 WC Plant Sciences SC Plant Sciences GA GU884 UT WOS:A1991GU88400031 PM 11538373 ER PT J AU YEN, Y GREEN, PJ AF YEN, Y GREEN, PJ TI IDENTIFICATION AND PROPERTIES OF THE MAJOR RIBONUCLEASES OF ARABIDOPSIS-THALIANA SO PLANT PHYSIOLOGY LA English DT Article ID POLYACRYLAMIDE-GEL ELECTROPHORESIS; SELF-INCOMPATIBILITY; PLANT NUCLEASES; WHEAT LEAVES; PURIFICATION; ENZYMES; CELLS AB The profile of major ribonuclease (RNase) activities of Arabidopsis thaliana has been identified and characterized using a substrate-based gel assay. Following sodium dodecyl sulfate-polyacrylamide gel electrophoresis, as many as 16 RNases, varying in size from 9 to 41 kilodaltons can be detected. Most of the RNase activities exhibit a pH optimum of about 6.5; however, the activity of a 22.6-kilodalton RNase is greatly enhanced at low pH. A number of the RNases in the 30- to 41-kilodalton range are sensitive to ethylenediaminetetraacetic acid, and their activities are enhanced by the presence of a low concentration of zinc during renaturation. At least one RNase appears to comigrate with a major DNase activity. The differential accumulation of several RNases in stems versus leaves indicates that some RNases are controlled in an organ-specific manner in A. thaliana. C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824. RP GREEN, PJ (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. NR 30 TC 93 Z9 95 U1 0 U2 1 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD DEC PY 1991 VL 97 IS 4 BP 1487 EP 1493 DI 10.1104/pp.97.4.1487 PG 7 WC Plant Sciences SC Plant Sciences GA GU884 UT WOS:A1991GU88400034 PM 16668575 ER PT J AU TALON, M ZEEVAART, JAD GAGE, DA AF TALON, M ZEEVAART, JAD GAGE, DA TI IDENTIFICATION OF GIBBERELLINS IN SPINACH AND EFFECTS OF LIGHT AND DARKNESS ON THEIR LEVELS SO PLANT PHYSIOLOGY LA English DT Article ID ZEA-MAYS-L; ENDOGENOUS GIBBERELLINS; PISUM-SATIVUM; ARABIDOPSIS-THALIANA; PARTIAL-PURIFICATION; INTERNODE LENGTH; PHOTOPERIOD; METABOLISM; SHOOTS; SEEDS AB The endogenous gibberellin (GA) content ot spinach (Spinacia oleracea) was reinvestigated by combined gas chromatography-mass spectrometry analysis. The 13-hydroxy GAs: GA53, GA44, GA19, GA17, GA20, GA5, GA1, GA29, and GA8; the non-3,13-hydroxy GAs: GA12, GA15, GA9, and GA51; and the 3-beta-hydroxy GAs: GA4, GA7, and GA34, were identified in spinach extracts by comparing full-scan mass spectra and Kovats retention indices with those of reference GAs. In addition, spinach plants contained GA7-isolactone, 16,17-dihydro-17-hydroxy-GA53, GA29-catabolite, 3-epi-GA1, and 10 uncharacterized GAs with mass spectra indicative of mono- and dihydroxy-GA12, monohydroxy-GA25, dihydroxy-GA24, and dihydroxy-GA9. The effect of light-dark conditions on the GA levels of the 13-hydroxylation pathway was studied by using labeled internal standards in selected ion monitoring mode. In short day, the GA levels were higher at the end of the light period than at the end of the dark period. Levels of GAs at the end of each short day were relatively constant. During the first supplementary light period of long day treatment, GA53 and GA19 declined dramatically, GA44 and GA1 decreased slightly, and GA20 increased. During the subsequent high-intensity light period, the GA20 level decreased and the levels of GA53, GA44, GA19, and GA1 increased slightly. Within 7 days after the beginning of long day treatment, similar patterns for GA53 and GA19 occurred. Furthermore, when these plants were transferred to darkness, an increase in the levels of GA53 and GA19 was observed. These results are compatible with the idea that in spinach, the flow through the GA biosynthetic pathway is much enhanced during the high-intensity light period, although GA turnover occurs also during the supplementary period of long day, both effects being responsible for the increase of GA20 and GA1 in long day. C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,NIH,MASS SPECTROMETRY FACIL,E LANSING,MI 48824. RP ZEEVAART, JAD (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. RI Talon, Manuel/C-8540-2014 OI Talon, Manuel/0000-0003-4291-9333 NR 25 TC 61 Z9 61 U1 0 U2 4 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD DEC PY 1991 VL 97 IS 4 BP 1521 EP 1526 DI 10.1104/pp.97.4.1521 PG 6 WC Plant Sciences SC Plant Sciences GA GU884 UT WOS:A1991GU88400038 PM 16668579 ER PT J AU PFENDER, E FINCKE, J SPORES, R AF PFENDER, E FINCKE, J SPORES, R TI ENTRAINMENT OF COLD GAS INTO THERMAL PLASMA JETS SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE THERMAL PLASMA JETS; COLD GAS ENTRAINMENT; DIAGNOSTICS ID RAMAN-SCATTERING; TURBULENT AB There is increasing evidence that the entrainment of cold gas surrounding a turbulent plasma jet is more of an engulfment type process rather than simple diffusion. A variety of diagnostic techniques have been employed to determine the development of turbulence in a plasma jet and to measure concentration and temperatures of the cold gas entrained into atmospheric-pressure argon plasma jets in ambient argon or air. The results indicate that the transition to turbulence causes a rapid drop of the axial jet velocity due to entrainment of the cold gas surrounding the plasma jet. Dissipation of the cold engulfed gas bubbles by molecular diffusion is relatively slow if molecular gases (for example air) are entrained, as indicated by conditional sampling and CARS measurements. Temperature measurements using emission spectroscopy and enthalpy probes show strong discrepancies in the jet fringes. C1 UNIV MINNESOTA,ERC PLASMA AIDED MFG,MINNEAPOLIS,MN 55455. EG&G IDAHO INC,INEL,IDAHO FALLS,ID 83415. RP PFENDER, E (reprint author), UNIV MINNESOTA,DEPT MECH ENGN,MINNEAPOLIS,MN 55455, USA. NR 16 TC 117 Z9 125 U1 1 U2 14 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 DEC PY 1991 VL 11 IS 4 BP 529 EP 543 DI 10.1007/BF01447164 PG 15 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA GN501 UT WOS:A1991GN50100009 ER PT J AU SMITH, SL AF SMITH, SL TI GROWTH, DEVELOPMENT AND DISTRIBUTION OF THE EUPHAUSIIDS THYSANOESSA-RASCHI (M-SARS) AND THYSANOESSA-INERMIS (KROYER) IN THE SOUTHEASTERN BERING SEA SO POLAR RESEARCH LA English DT Article; Proceedings Paper CT PRO MARE SYMP ON POLAR MARINE ECOLOGY CY MAY 12-16, 1990 CL TRONDHEIM, NORWAY AB The distribution and abundance of the euphausiids Thysanoessa raschi and Thysanoessa inermis in the shelf waters of the southeastern Bering Sea were investigated during spring and summer of 1980 and 1981. Experiments were conducted during the study to describe thc reproduction, growth and development of these species. T. inermis was the dominant euphausiid species observed over thc outer shelf region; it began spawning in early April while T. raschi dominated the euphausiids over the middle shelf and began spawning in mid or late May. The seasonal progression in spawning followed the seasonal development of temperature; however, spawning did not begin earlier in 1981 which was a warmer year than 1980. Average egg production of T. raschi ranged from 3.4% to 3.8% dry body weight of the female per day during the first three days after capture. Secondary production estimates for T. raschi females ranged from 4.2% to 5.2% dry body weight per day in 1980 and 5.9% to 6.0% dry body weight per day in 1981. A sharp decline in the abundance of adolescent and adult euphausiids over the middle shelf during the spring bloom period when food appeared to be abundant suggests that predation by diving birds, pollack, Tanner crabs. whales and seals effectively controls the euphausiid population. RP SMITH, SL (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. NR 0 TC 44 Z9 44 U1 0 U2 6 PU NORWEGIAN POLAR INST PI OSLO PA POSTBOKS 5072 MAJORSTUA, 1330 OSLO, NORWAY SN 0800-0395 J9 POLAR RES JI Polar Res. PD DEC PY 1991 VL 10 IS 2 BP 461 EP 478 DI 10.1111/j.1751-8369.1991.tb00666.x PG 18 WC Ecology; Geosciences, Multidisciplinary; Oceanography SC Environmental Sciences & Ecology; Geology; Oceanography GA HX560 UT WOS:A1991HX56000010 ER PT J AU REDDY, ST STOKER, AW BISSELL, MJ AF REDDY, ST STOKER, AW BISSELL, MJ TI EXPRESSION OF ROUS-SARCOMA VIRUS-DERIVED RETROVIRAL VECTORS IN THE AVIAN BLASTODERM - POTENTIAL AS STABLE GENETIC-MARKERS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE EMBRYONIC DEVELOPMENT; REPLICATION-DEFECTIVE VIRUS; LINEAGE MARKER; LACZ ID DENOVO METHYLATION; EXOGENOUS GENES; LEUKEMIA-VIRUS; CHICKEN; CELLS; TISSUE; EMBRYO AB Retroviruses are valuable tools in studies of embryonic development, both as gene expression vectors and as cell lineage markers. In this study early chicken blastoderm cells are shown to be permissive for infection by Rous sarcoma virus and derivative replication-defective vectors, and, in contrast to previously published data, these cells will readily express viral genes. In cultured blastoderm cells, Rous sarcoma virus stably integrates and is transcribed efficiently, producing infectious virus particles. Using replication-defective vectors encoding the bacterial lacZ gene, we further show that blastoderms can be infected in culture and in ovo. In ovo, lacZ expression is seen within 24 hr of virus inoculation, and by 96 hr stably expressing clones of cells are observed in diverse tissues throughout the embryo, including epidermis, somites, and heart, as well as in extraembryonic membranes. Given the rapid onset of vector expression and the broad range of permissive cell types, it should be feasible to use Rous sarcoma virus-derived retroviruses as early lineage markers and expression vectors beginning at the blastoderm stage of avian embryogenesis. RP REDDY, ST (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI stoker, andrew/C-1573-2008 NR 23 TC 30 Z9 30 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD DEC PY 1991 VL 88 IS 23 BP 10505 EP 10509 DI 10.1073/pnas.88.23.10505 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GT480 UT WOS:A1991GT48000027 PM 1660139 ER PT J AU CHAN, CK DIMAGNO, TJ CHEN, LXQ NORRIS, JR FLEMING, GR AF CHAN, CK DIMAGNO, TJ CHEN, LXQ NORRIS, JR FLEMING, GR TI MECHANISM OF THE INITIAL CHARGE SEPARATION IN BACTERIAL PHOTOSYNTHETIC REACTION CENTERS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE ELECTRON TRANSFER; RHODOBACTER-SPHAEROIDES; SUPEREXCHANGE; STIMULATED EMISSION ID PRIMARY ELECTRON-TRANSFER; NONSUPEREXCHANGE COHERENT MECHANISM; RHODOPSEUDOMONAS-SPHAEROIDES R-26; FEMTOSECOND SPECTROSCOPY; RHODOBACTER-SPHAEROIDES; TEMPERATURE; DYNAMICS; VIRIDIS; BACTERIOCHLOROPHYLL; MODEL AB The initial electron transfer in reaction centers from Rhodobacter sphaeroides R26 was studied by a subpicosecond transient pump-probe technique. The measured kinetics at various wavelengths were analyzed and compared with several mechanisms for electron transfer. An unambiguous determination of the initial electron transfer mechanism in reaction centers cannot be made by studying the anion absorption region (640-690 nm), due to the spectral congestion in this region. However, correlations between the stimulated emission decay of the excited state of the special pair, P*, at 926 nm and bleaching of the bacteriopheophytin Q(X) absorption at 545 nm suggest that the electron transfer at 283 K is dominated by a two-step sequential mechanism, whereas one-step superexchange and the two-step sequential mechanism have about equal contributions at 22 K. C1 UNIV CHICAGO,CTR PHOTOCHEM & PHOTOBIOL,CHICAGO,IL 60637. UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP CHAN, CK (reprint author), UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637, USA. NR 44 TC 134 Z9 139 U1 1 U2 6 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD DEC PY 1991 VL 88 IS 24 BP 11202 EP 11206 DI 10.1073/pnas.88.24.11202 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GV877 UT WOS:A1991GV87700046 PM 1763033 ER PT J AU UBERBACHER, EC MURAL, RJ AF UBERBACHER, EC MURAL, RJ TI LOCATING PROTEIN-CODING REGIONS IN HUMAN DNA-SEQUENCES BY A MULTIPLE SENSOR NEURAL NETWORK APPROACH SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE CODING EXON LOCALIZATION; GENE STRUCTURE; PATTERN RECOGNITION; DNA SEQUENCE ANALYSIS ID GENE AB Genes in higher eukaryotes may span tens or hundreds of kilobases with the protein-coding regions accounting for only a few percent of the total sequence. Identifying genes within large regions of uncharacterized DNA is a difficult undertaking and is currently the focus of many research efforts. We describe a reliable computational approach for locating protein-coding portions of genes in anonymous DNA sequence. Using a concept suggested by robotic environmental sensing, our method combines a set of sensor algorithms and a neural network to localize the coding regions. Several algorithms that report local characteristics of the DNA sequence, and therefore act as sensors, are also described. In its current configuration the "coding recognition module" identifies 90% of coding exons of length 100 bases or greater with less than one false positive coding exon indicated per five coding exons indicated. This is a significantly lower false positive rate than any method of which we are aware. This module demonstrates a method with general applicability to sequence-pattern recognition problems and is available for current research efforts. C1 OAK RIDGE NATL LAB, DIV ENGN PHYS & MATH, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, OAK RIDGE GRAD SCH BIOMED SCI, OAK RIDGE, TN 37830 USA. RP OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. NR 19 TC 534 Z9 541 U1 2 U2 6 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 DEC PY 1991 VL 88 IS 24 BP 11261 EP 11265 DI 10.1073/pnas.88.24.11261 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GV877 UT WOS:A1991GV87700058 PM 1763041 ER PT J AU PETITHORY, JR MASIARZ, FR KIRSCH, JF SANTI, DV MALCOLM, BA AF PETITHORY, JR MASIARZ, FR KIRSCH, JF SANTI, DV MALCOLM, BA TI A RAPID METHOD FOR DETERMINATION OF ENDOPROTEINASE SUBSTRATE-SPECIFICITY - SPECIFICITY OF THE 3C PROTEINASE FROM HEPATITIS-A VIRUS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE PROTEINASE; EDMAN DEGRADATION; PEPTIDE MIXTURES ID PROTEOLYTIC CLEAVAGE; ESCHERICHIA-COLI; VIRAL PROTEINASES; POLIOVIRUS; INVITRO; PROTEASE; SITE; PRECURSORS; EXPRESSION; 3C-PROTEINASE AB The preferred amino acid residues at the P1' and P2' positions of peptide substrates of the 3C proteinase from hepatitis A virus (HAV-3C) have been determined by a rapid screening method. The enzyme was presented with two separate mixtures of N-terminal acetylated peptides, which were identical in sequence except for the amino acids at the P1' or P2' positions, where a set of 15 or 16 amino acids was introduced. Enzyme-catalyzed hydrolysis of the peptide mixtures generated free amino termini, which allowed direct sequence analysis by Edman degradation. The relative yield of each amino acid product in the appropriate sequencing cycle gave the amount of each substrate mixture component hydrolyzed. This allowed the simultaneous evaluation of the relative k(cat)/K(m) values for each component in the mixture. The peptide substrates preferred by the HAV-3C proteinase in the P1' mixture were glycine, alanine, and serine. The enzyme has little specificity at P2'; only arginine and proline peptides were excluded as substrates. This method provides a rapid determination of the preferred residues for a peptide substrate and should be applicable to other endoproteinases. C1 CHIRON CORP,4560 HORTON ST,EMERYVILLE,CA 94068. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT BIOCHEM & BIOPHYS,SAN FRANCISCO,CA 94143. PROTOS CORP,EMERYVILLE,CA 94068. RP MALCOLM, BA (reprint author), CHIRON CORP,4560 HORTON ST,EMERYVILLE,CA 94068, USA. NR 33 TC 49 Z9 49 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD DEC PY 1991 VL 88 IS 24 BP 11510 EP 11514 DI 10.1073/pnas.88.24.11510 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GV877 UT WOS:A1991GV87700109 PM 1662396 ER PT J AU LEUNG, FC AF LEUNG, FC TI CIRCADIAN-RHYTHMS OF MELATONIN RELEASE FROM CHICKEN PINEAL INVITRO - MODIFIED MELATONIN RADIOIMMUNOASSAY SO PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE LA English DT Article ID N-ACETYLTRANSFERASE ACTIVITY; GLAND; SEROTONIN; CULTURE; CLOCK AB An improved and simplified radioimmunoassay for measuring pineal, serum, and in vitro cultured medium melatonin is described. Using 2-[I-125]iodomelatonin as radiolabeled ligand and a polyclonal rabbit antimelatonin antiserum, melatonin concentrations were determined in all three types of samples by a 2-day direct equilibrium double-antibody assay method without prior extraction. Serial dilutions of pineal homogenates, serum, and cultured medium all gave parallel displacement curves. Cross-reactivity of the antisera with other indoles was negligible. Intraassay coefficients of variation (n = 3) were 5.09, 3.32, and 5.05% at 7.81, 62.5, and 500 pg/tube, respectively, and the interassay coefficients of variation (n = 20) were 12.18% at 62.5 pg/tube. A characteristic diurnal rhythm of melatonin was observed using this direct assay for measuring daytime and nighttime chicken pineal and serum samples. An in vitro incubation of chicken pineal glands with a lighting cycle of 12-hr light: 12-hr dark showed that the diurnal rhythm of melatonin secretion into the cultured medium was maintained. The direct assay method described in this report for measuring chicken melatonin using 2-[I-125]iodomelatonin as radiolabeled ligand coupled with the in vitro cultured chicken pineal gland clearly offers great potential for studying the chicken pineal circadian oscillator and its underlying mechanism. RP LEUNG, FC (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 19 TC 5 Z9 5 U1 0 U2 1 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0037-9727 J9 P SOC EXP BIOL MED JI Proc. Soc. Exp. Biol. Med. PD DEC PY 1991 VL 198 IS 3 BP 826 EP 832 PG 7 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA GR237 UT WOS:A1991GR23700009 PM 1946475 ER PT J AU OBER, BA SHENAUT, GK JAGUST, WJ STILLMAN, RC AF OBER, BA SHENAUT, GK JAGUST, WJ STILLMAN, RC TI AUTOMATIC SEMANTIC PRIMING WITH VARIOUS CATEGORY RELATIONS IN ALZHEIMERS-DISEASE AND NORMAL AGING SO PSYCHOLOGY AND AGING LA English DT Article ID LEXICAL-DECISION TASK; SPREADING ACTIVATION; WORD RECOGNITION; INHIBITION; MEMORY; ACCESS; REPETITION; ROLES; MODEL; PRONUNCIATION C1 DEPT VET AFFAIRS MED CTR,LIVERMORE,CA. DEPT VET AFFAIRS MED CTR,MARTINEZ,CA. UNIV CALIF DAVIS,DEPT NEUROL,DAVIS,CA 95616. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. RP OBER, BA (reprint author), UNIV CALIF DAVIS,DEPT APPL BEHAV SCI,DIV HUMAN DEV,DAVIS,CA 95616, USA. NR 52 TC 93 Z9 93 U1 1 U2 3 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0882-7974 J9 PSYCHOL AGING JI Psychol. Aging PD DEC PY 1991 VL 6 IS 4 BP 647 EP 660 DI 10.1037/0882-7974.6.4.647 PG 14 WC Gerontology; Psychology, Developmental SC Geriatrics & Gerontology; Psychology GA GV050 UT WOS:A1991GV05000019 PM 1777154 ER PT J AU JONES, TD MORRIS, MD YOUNG, RW AF JONES, TD MORRIS, MD YOUNG, RW TI A MATHEMATICAL-MODEL FOR RADIATION-INDUCED MYELOPOIESIS SO RADIATION RESEARCH LA English DT Article ID HEMATOPOIETIC STEM-CELLS; REPAIR; MOUSE; PROLIFERATION; PURIFICATION; LETHALITY; BREAKS; DEATH C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. DEF NUCL AGCY,RADIAT POLICY OFF,WASHINGTON,DC 20305. RP JONES, TD (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,BLDG 4500-S,MS 6101,POB 2008,OAK RIDGE,TN 37831, USA. NR 53 TC 21 Z9 21 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 DEC PY 1991 VL 128 IS 3 BP 258 EP 266 DI 10.2307/3578048 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA GT604 UT WOS:A1991GT60400004 PM 1961922 ER PT J AU MORRIS, MD JONES, TD YOUNG, RW AF MORRIS, MD JONES, TD YOUNG, RW TI ESTIMATION OF COEFFICIENTS IN A MODEL OF RADIATION-INDUCED MYELOPOIESIS FROM MORTALITY DATA FOR MICE FOLLOWING X-RAY-EXPOSURE SO RADIATION RESEARCH LA English DT Article ID LETHALITY C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. DEF NUCL AGCY,RADIAT POLICY OFF,WASHINGTON,DC 20305. RP MORRIS, MD (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,POB 2008,OAK RIDGE,TN 37831, USA. NR 14 TC 15 Z9 15 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 DEC PY 1991 VL 128 IS 3 BP 267 EP 275 DI 10.2307/3578049 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA GT604 UT WOS:A1991GT60400005 PM 1961923 ER PT J AU BADGER, CC RASEY, J NOURIGAT, C FISHER, DR HUI, TE WU, ZM BERNSTEIN, ID AF BADGER, CC RASEY, J NOURIGAT, C FISHER, DR HUI, TE WU, ZM BERNSTEIN, ID TI WR2721 PROTECTION OF BONE-MARROW IN I-131-LABELED ANTIBODY THERAPY SO RADIATION RESEARCH LA English DT Note ID MONOCLONAL-ANTIBODY; NORMAL-TISSUES; WR-2721; RADIOPROTECTION; RADIOTHERAPY; RADIATION; LYMPHOMA C1 UNIV WASHINGTON, DEPT MED, SEATTLE, WA 98115 USA. UNIV WASHINGTON, DEPT PEDIAT, SEATTLE, WA 98115 USA. UNIV WASHINGTON, DEPT RADIAT ONCOL, SEATTLE, WA 98115 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP BADGER, CC (reprint author), FRED HUTCHINSON CANC RES CTR, DIV CLIN RES, 1124 COLUMBIA ST, SEATTLE, WA 98104 USA. FU NCI NIH HHS [CA36485, CA26386] NR 16 TC 8 Z9 8 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 DEC PY 1991 VL 128 IS 3 BP 320 EP 324 DI 10.2307/3578056 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA GT604 UT WOS:A1991GT60400012 PM 1660165 ER PT J AU ROCKWOOD, AL BUSMAN, M UDSETH, HR SMITH, RD AF ROCKWOOD, AL BUSMAN, M UDSETH, HR SMITH, RD TI THERMALLY INDUCED DISSOCIATION OF IONS FROM ELECTROSPRAY MASS-SPECTROMETRY SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID IONIZATION; PROTEINS AB The thermally induced dissociation (TID) of ions at near atmospheric pressure, followed by their mass spectrometric analysis, is demonstrated. The TID occurs in a heated metal capillary interface, and should be broadly applicable to any system capable of producing ions at high pressure. The heated capillary provides a reaction vessel, potentially very useful for kinetic and mechanistic studies of ions. The technique has been applied to the fragmentation of large multiply charged ions from an electrospray ionization source. Preliminary results show that stability for multiply protonated peptide or protein molecules is inversely related to its charge. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RP SMITH, RD (reprint author), PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 12 TC 64 Z9 65 U1 2 U2 7 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 DEC PY 1991 VL 5 IS 12 BP 582 EP 585 DI 10.1002/rcm.1290051203 PG 4 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA GU394 UT WOS:A1991GU39400002 ER PT J AU CURLEE, TR DAS, S AF CURLEE, TR DAS, S TI ADVANCED MATERIALS - INFORMATION AND ANALYSIS NEEDS SO RESOURCES POLICY LA English DT Article AB Several public agencies have expressed interest in increasing the quantity and improving the quality of information they provide on advanced materials. This paper discusses specific information and analysis needs by focusing on potential differences between traditional and advanced materials. Also discussed are the various ways advanced materials can be defined and classified and the importance of different classification schemes to different types of analyses. Twelve potential differences between advanced and traditional materials are discussed. Potential differences range from varying physical and chemical properties to the range of expertise required for materials development and manufacture, Numerous information and analysis needs are derived from the discussion of these differences. The paper argues that identifying information needs for advanced materials requires a fundamental rethinking of why information of various types is important. RP CURLEE, TR (reprint author), OAK RIDGE NATL LAB,ENERGY & ECON ANAL SECT,OAK RIDGE,TN 37831, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4207 J9 RESOUR POLICY JI Resour. Policy PD DEC PY 1991 VL 17 IS 4 BP 316 EP 331 PG 16 WC Environmental Studies SC Environmental Sciences & Ecology GA GW714 UT WOS:A1991GW71400005 ER PT J AU SWEATT, WC CRUMP, OB AF SWEATT, WC CRUMP, OB TI USING A FAST LENS TO COLLECT THE SIGNAL IN A VISAR SYSTEM SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INTERFEROMETER AB VISAR (velocity interferometer system for any reflector) systems are used to measure the Doppler shift of a backscattered laser beam incident on a target, from whence the target's velocity can be calculated. In the past, slow lenses (F/4 or slower) have been used to collect the scattered light. As a result, the relationship between the velocity and the Doppler shift was precisely known, but in many applications a multiwatt laser was required to give an adequate signal. We are using faster lenses and lower-powered lasers. A faster lens will collect more power and a wider spectrum of Doppler-shifted signal. The average Doppler shift is reduced slightly because of the larger range of signal-collecting angles, but it is essentially a linear function of velocity. The wider Doppler spectrum also reduces the fringe contrast slightly, but it is only significant for very fast lenses and large numbers of fringes. RP SWEATT, WC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 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 DEC PY 1991 VL 62 IS 12 BP 2946 EP 2949 DI 10.1063/1.1142186 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GV901 UT WOS:A1991GV90100016 ER PT J AU GIESKE, JH FROST, HM AF GIESKE, JH FROST, HM TI TECHNIQUE FOR MEASURING ULTRASONIC VELOCITY AND ATTENUATION CHANGES IN ATTENUATIVE MATERIALS AT TEMPERATURE SUCH AS DURING SINTERING PROCESSES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB This paper describes a PC-based automatic measuring system for ultrasonic velocity and attenuation changes in highly attenuating green-body ceramics during sintering temperatures. The system uses pulse-echo/through-transmission buffer rod technique and records pulse-echo and through-transmission waveforms at programmed time or temperature intervals. Data can be taken without interruption during temperature schedules lasting many days. Archival files of the waveform data are saved on disks for later analysis. Accuracy of the technique is demonstrated for solid fused silica for which dynamic resonance and Brillouin scattering data of the longitudinal velocity are compared at temperatures up to 1200-degrees-C. The system has been used successfully for measuring longitudinal velocity and attenuation changes at 5 MHz during sintering of ZnO-based varistor materials and YBa2Cu3Ox superconducting ceramics. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP GIESKE, JH (reprint author), SANDIA NATL LABS,DIV NDT TECHNOL 7552,ALBUQUERQUE,NM 87185, USA. NR 8 TC 8 Z9 8 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1991 VL 62 IS 12 BP 3056 EP 3060 DI 10.1063/1.1142153 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GV901 UT WOS:A1991GV90100036 ER PT J AU DEVRIES, GJ LIETZKE, AF VANOS, CFA STEARNS, JW AF DEVRIES, GJ LIETZKE, AF VANOS, CFA STEARNS, JW TI ION-SOURCE METAL-ARC FAULT CURRENT PROTECTION CIRCUIT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB Ion sources can be damaged by arcs between metallic components of the source if these arcs are permitted to last. The negative-biased low-work-function converter in a surface conversion negative ion source is especially susceptible to metal-arc breakdown damage. Here an electronic circuit for minimizing the damage caused by such an arc is described. The circuit uses a transistor switch and an inductor in series with the converter bias power supply to limit the damage during the metal-arc breakdown. RP DEVRIES, GJ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1991 VL 62 IS 12 BP 3098 EP 3099 DI 10.1063/1.1142160 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GV901 UT WOS:A1991GV90100043 ER PT J AU IMAN, RL HELTON, JC AF IMAN, RL HELTON, JC TI THE REPEATABILITY OF UNCERTAINTY AND SENSITIVITY ANALYSES FOR COMPLEX PROBABILISTIC RISK ASSESSMENTS SO RISK ANALYSIS LA English DT Article DE LATIN HYPERCUBE SAMPLING; MONTE-CARLO ID NUCLEAR-POWER-PLANTS; COMPUTER-MODELS; INPUT VARIABLES AB The performance of a probabilistic risk assessment (PRA) for a nuclear power plant is a complex undertaking, involving the assembly of an accident frequency analysis, an accident progression analysis, a source term analysis, and a consequence analysis. Each of these analyses is, in itself, quite complex. Uncertainties enter into a PRA from each of these analyses. An important focus in recent PRAs has been to incorporate these uncertainties at each stage of the analysis, propagate the subsequent uncertainties through the entire analysis, and include uncertainty in the final results. Monte Carlo procedures based on Latin hypercube sampling provide one way to perform propagations of this type. In this paper, the results of two complete and independent Monte Carlo calculations for a recently completed PRA for a nuclear power plant are compared as a means of providing empirical evidence on the repeatability of uncertainty and sensitivity analyses for large-scale PRA calculations. These calculations use the same variables and analysis structure with two independently generated Latin hypercube samples. The results of the two calculations show a high degree of repeatability for the analysis of a very complex system. C1 ARIZONA STATE UNIV,DEPT MATH,TEMPE,AZ 85287. RP IMAN, RL (reprint author), SANDIA NATL LABS,MFG SYST RELIABIL MODELING,DIV 6613,ALBUQUERQUE,NM 87185, USA. NR 53 TC 48 Z9 48 U1 2 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 591 EP 606 DI 10.1111/j.1539-6924.1991.tb00649.x PG 16 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA GV905 UT WOS:A1991GV90500006 ER PT J AU BASSETT, GW HEMPHILL, RC AF BASSETT, GW HEMPHILL, RC TI PERCEIVED RISK, STIGMA, AND POTENTIAL ECONOMIC-IMPACTS OF A HIGH-LEVEL NUCLEAR WASTE REPOSITORY IN NEVADA - COMMENTS SO RISK ANALYSIS LA English DT Article C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP BASSETT, GW (reprint author), UNIV ILLINOIS,DEPT ECON,M-C 144,BOX 802451,CHICAGO,IL 60680, USA. NR 4 TC 3 Z9 3 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 DEC PY 1991 VL 11 IS 4 BP 697 EP 700 DI 10.1111/j.1539-6924.1991.tb00659.x PG 4 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA GV905 UT WOS:A1991GV90500016 PM 1780506 ER PT J AU MOSKOWITZ, PD AF MOSKOWITZ, PD TI ARCHIE - ENVIRONMENTAL-POLLUTION MODELING SYSTEM SO RISK ANALYSIS LA English DT Software Review RP MOSKOWITZ, PD (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 705 EP 705 DI 10.1111/j.1539-6924.1991.tb00662.x PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA GV905 UT WOS:A1991GV90500019 ER PT J AU WHITE, RK AF WHITE, RK TI PETROLEUM CONTAMINATED SOILS, VOL 1, REMEDIATION TECHNIQUES, ENVIRONMENTAL FATE, RISK ASSESSMENT - KOSTECKI,PT, CALABRESE,EJ SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 707 EP 707 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 GV905 UT WOS:A1991GV90500020 ER PT J AU WHITE, RK AF WHITE, RK TI MANAGING INDUSTRIAL HAZARDOUS-WASTE - A PRACTICAL HANDBOOK - LINDGREN,G SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 707 EP 707 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 GV905 UT WOS:A1991GV90500021 ER PT J AU WHITE, RK AF WHITE, RK TI HEALTH-EFFECTS OF DRINKING-WATER TREATMENT TECHNOLOGIES - DRINKING-WATER-HLTH-EFFECTS-TASK-FORCE SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 707 EP 708 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 GV905 UT WOS:A1991GV90500022 ER PT J AU WHITE, RK AF WHITE, RK TI ENVIRONMENTAL CHEMISTRY AND TOXICOLOGY OF ALUMINUM - LEWIS,TE SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 708 EP 708 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 GV905 UT WOS:A1991GV90500024 ER PT J AU WHITE, RK AF WHITE, RK TI LIGHT WATER-REACTOR SAFETY - PERSHAGEN,B SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 708 EP 709 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 GV905 UT WOS:A1991GV90500025 ER PT J AU WHITE, RK AF WHITE, RK TI CHEMICAL HAZARDS IN THE WORKPLACE - SCOTT,RM SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 1 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1991 VL 11 IS 4 BP 708 EP 708 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 GV905 UT WOS:A1991GV90500023 ER PT J AU WHITE, RK AF WHITE, RK TI SOCIAL DECISION METHODOLOGY FOR TECHNOLOGICAL PROJECTS - VLEK,C, CVETKOVICH,G SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,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 DEC PY 1991 VL 11 IS 4 BP 709 EP 709 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 GV905 UT WOS:A1991GV90500027 ER PT J AU WHITE, RK AF WHITE, RK TI BIOLOGICALLY BASED METHODS FOR CANCER RISK ASSESSMENT - TRAVIS,CC SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,RISK ANAL SECT,CHINN BLDG,MS-6492,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 DEC PY 1991 VL 11 IS 4 BP 709 EP 709 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 GV905 UT WOS:A1991GV90500026 ER PT J AU BAKER, GA AF BAKER, GA TI SOME NUMERICAL RESULTS ON THE CONVERGENCE OF INTEGRAL APPROXIMANTS SO ROCKY MOUNTAIN JOURNAL OF MATHEMATICS LA English DT Article ID SERIES ANALYSIS AB I review some work in which integral approximants (a special case of Hermite-Pade approximants) based on second-order, inhomogeneous, linear differential equations are applied to a series of test functions. Previous theoretical analysis has pointed out various function classes as particularly appropriate for study. Some existing theorems are illustrated and the numerical results reported give an indication of the general rates of covergence to be expected. In the comparison of the rates of convergence between "diagonal" and "horizontal" types of approximants, the "diagonal" type is usually superior (but not always) to the "horizontal" type. Comparison is made with some other methods applied to some of the same test series. Quite good convergence is obtained with the integral approximants for a diverse set of test functions; however, as with any such general type of series summation (or approximate analytic continuation) method, a moderately large number of series coefficients is required. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ROCKY MT MATH CONSORTIUM PI TEMPE PA ARIZ STATE UNIV DEPT MATH, TEMPE, AZ 85281 SN 0035-7596 J9 ROCKY MT J MATH JI Rocky Mt. J. Math. PD WIN PY 1991 VL 21 IS 1 BP 25 EP 40 DI 10.1216/rmjm/1181072994 PG 16 WC Mathematics SC Mathematics GA FW736 UT WOS:A1991FW73600003 ER PT J AU BAKER, GA GRAVESMORRIS, PR AF BAKER, GA GRAVESMORRIS, PR TI CONVERGENCE THEOREMS FOR ROWS OF HERMITE-PADE INTEGRAL APPROXIMANTS SO ROCKY MOUNTAIN JOURNAL OF MATHEMATICS LA English DT Article ID SERIES ANALYSIS AB The object of this paper is the study of the convergence of integral approximants, which are a special case of Hermite-Pade approximants of Latin type, to functions which are analytic in a disk except for one interior singular point. We give detailed estimates of the rate of convergence of the sequence of approximants of type [L/M; 1] for fixed M, as L --> infinity, in a model case study. We also give estimates of the rate of convergence of approximants of type [L/M; 1; 2] for fixed M, as L --> infinity, for a model exhibiting a confluent singularity. We prove that integral approximants of these types converge uniformly on compact subsets of the disk which is centered on the origin and has the singular point of the given function on its boundary. We further prove convergence on additional Riemann sheets beyond the principal one in a lune near the singular point. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. UNIV BRADFORD, SCH MATH SCI, DEPT MATH, BRADFORD BD7 1DP, W YORKSHIRE, ENGLAND. NR 28 TC 2 Z9 2 U1 0 U2 0 PU ROCKY MT MATH CONSORTIUM PI TEMPE PA ARIZ STATE UNIV, DEPT MATH, TEMPE, AZ 85287-1904 USA SN 0035-7596 EI 1945-3795 J9 ROCKY MT J MATH JI Rocky Mt. J. Math. PD WIN PY 1991 VL 21 IS 1 BP 41 EP 69 DI 10.1216/rmjm/1181072995 PG 29 WC Mathematics SC Mathematics GA FW736 UT WOS:A1991FW73600004 ER PT J AU HORN, KM DOYLE, BL WALSH, DS SEXTON, FW AF HORN, KM DOYLE, BL WALSH, DS SEXTON, FW TI APPLICATION OF THE NUCLEAR MICROPROBE TO THE IMAGING OF SINGLE EVENT UPSETS IN INTEGRATED-CIRCUITS SO SCANNING MICROSCOPY LA English DT Article DE SINGLE EVENT UPSET; NUCLEAR MICROPROBE; RADIATION TESTING; SEU-IMAGING ID SEU AB A new form of microscopy has been developed which produces micron-resolution maps of where single event upsets occur during ion irradiation of integrated circuits. Utilizing a nuclear microprobe, this imaging technique can irradiate, in isolation, individual components of an integrated circuit (e.g. transistor drains, gates, feedback resistors) and measure immediately the effect of a high energy ion strike on circuit performance. This detailed circuit characterization technique provides a precision diagnostic with which to evaluate the design of integrated circuits that are to be used in space or other radiation environments. RP HORN, KM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 10 Z9 10 U1 0 U2 1 PU SCANNING MICROSCOPY INT PI CHICAGO PA PO BOX 66507, AMF O'HARE, CHICAGO, IL 60666 SN 0891-7035 J9 SCANNING MICROSCOPY JI Scanning Microsc. PD DEC PY 1991 VL 5 IS 4 BP 969 EP 976 PG 8 WC Microscopy SC Microscopy GA JC395 UT WOS:A1991JC39500008 ER PT J AU HOESCHELE, JD TURNER, JE ENGLAND, MW AF HOESCHELE, JD TURNER, JE ENGLAND, MW TI INORGANIC CONCEPTS RELEVANT TO METAL-BINDING, ACTIVITY, AND TOXICITY IN A BIOLOGICAL SYSTEM SO SCIENCE OF THE TOTAL ENVIRONMENT LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL WORKSHOP ON QUANTITATIVE STRUCTURE-ACTIVITY RELATIONSHIPS IN ENVIRONMENTAL TOXICOLOGY CY SEP 16-20, 1990 CL VELDHOVEN, NETHERLANDS ID SOFTNESS AB Selected physical and inorganic concepts and factors which might be important in assessing and/or understanding the fate and disposition of metal compounds in a biological environment are reviewed. The stereochemistry (geometry), thermodynamic stability, redox properties, and intrinsic reactivity/lability are properties of metal compounds which can have a major influence on metal-target binding and on the eliciting of activity/toxicity. Concepts and factors are illustrated with appropriate examples where possible. Efforts to correlate the toxicity of metal compounds with a suitable indicator of toxicity should be expanded to include other parameters or combinations of parameters. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP HOESCHELE, JD (reprint author), UNIV MICHIGAN,DEPT CHEM,930 N UNIV AVE,ANN ARBOR,MI 48109, USA. NR 23 TC 11 Z9 11 U1 1 U2 4 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 DEC PY 1991 VL 109 BP 477 EP 492 DI 10.1016/0048-9697(91)90202-P PG 16 WC Environmental Sciences SC Environmental Sciences & Ecology GA GV457 UT WOS:A1991GV45700039 PM 1815368 ER PT J AU CAO, W THOMAS, G CAREY, MJ BERKOWITZ, AE AF CAO, W THOMAS, G CAREY, MJ BERKOWITZ, AE TI CHARACTERIZATION OF EPITAXIAL SPUTTERED NIXCO1-XO THIN-FILMS ON ALPHA-AL2O3 USING TRANSMISSION ELECTRON-MICROSCOPY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID NIO; SUPERLATTICES; COO C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES 0401,LA JOLLA,CA 92093. RP CAO, W (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 10 TC 11 Z9 11 U1 1 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 DEC PY 1991 VL 25 IS 12 BP 2633 EP 2638 DI 10.1016/0956-716X(91)90130-S PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GU420 UT WOS:A1991GU42000002 ER PT J AU PIKE, LM LIU, CT AF PIKE, LM LIU, CT TI THE EFFECT OF BORON DOPING ON THE HALL-PETCH SLOPE OF FEAL (40 AT -PERCENT AL) SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ROOM-TEMPERATURE DUCTILITY; INTERGRANULAR FRACTURE; TENSILE PROPERTIES; GRAIN-BOUNDARIES; NI3AL; ALLOYS; MICROSTRUCTURE; EMBRITTLEMENT; SULFUR; SIZE RP PIKE, LM (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 24 TC 10 Z9 10 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC PY 1991 VL 25 IS 12 BP 2757 EP 2761 DI 10.1016/0956-716X(91)90152-Q PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GU420 UT WOS:A1991GU42000024 ER PT J AU COX, RW AF COX, RW TI STRESS-ASSISTED DIFFUSION - A FREE-BOUNDARY PROBLEM SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE STEFAN PROBLEM; SINGULAR PERTURBATION; SIMILARITY SOLUTION AB A Stefan problem is formulated for a diffusion equation where the Fickian flux is supplemented by a stress gradient term. The stress in turn obeys a concentration-dependent evolution equation that includes impulsive and relaxation effects. The speed of the free boundary is taken to be proportional to the flux at the front. For short times, the front position is found to be proportional to t1/2. Using singular perturbation and numerical methods, three types of ''long-time'' behavior are found, depending on relationships between the coefficient functions and the parameters in the problem: (i) the front position is proportional to t1/2; (ii) the front position is proportional to t; or (iii) the front stops in a finite time and the solution becomes singular (infinite gradients) at that point. RP COX, RW (reprint author), LOS ALAMOS NATL LAB,COMP RES GRP,M-S B265,LOS ALAMOS,NM 87545, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD DEC PY 1991 VL 51 IS 6 BP 1522 EP 1537 DI 10.1137/0151076 PG 16 WC Mathematics, Applied SC Mathematics GA GT340 UT WOS:A1991GT34000003 ER PT J AU GAUTESEN, AK ZIOLKOWSKI, RW MCLEOD, RR AF GAUTESEN, AK ZIOLKOWSKI, RW MCLEOD, RR TI A SOLUTION TO THE SCATTERING OF ELECTROMAGNETIC-WAVES FROM A DIELECTRIC SEMI-CYLINDER SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE ELECTROMAGNETIC WAVES; SCATTERING; DIFFRACTION; DUAL SERIES; DIELECTRIC SEMI-CYLINDER AB The problem of scattering of electromagnetic waves from an arbitrary, infinite dielectric semi-cylinder is treated analytically through a combined dual series and integral equation formulation. It is demonstrated that the numerical implementation of this treatment satisfies the reciprocity relation as well as the electromagnetic boundary conditions. Numerical results are also provided to illustrate the fields generated in the vicinity of the semi-cylinder directly and in the far-field indirectly through the use of radar cross sections. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP GAUTESEN, AK (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD DEC PY 1991 VL 51 IS 6 BP 1556 EP 1567 DI 10.1137/0151078 PG 12 WC Mathematics, Applied SC Mathematics GA GT340 UT WOS:A1991GT34000005 ER PT J AU SORENSEN, DC PING, TPT AF SORENSEN, DC PING, TPT TI ON THE ORTHOGONALITY OF EIGENVECTORS COMPUTED BY DIVIDE-AND-CONQUER TECHNIQUES SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE DIVIDE-AND-CONQUER; RANK-1 UPDATE; SIMULATED EXTRA PRECISION ID EIGENPROBLEM AB A detailed analysis on the accuracy issues in calculating the eigensystems of rank 1 perturbed diagonal systems is presented. Such calculations are the core of the divide-and-conquer technique proposed by Bunch, Nielsen, and Sorensen and refined by Dongarra and Sorensen. In particular, the computed eigenvectors are proved to be guaranteed orthogonality provided the secular equation is evaluated in a precision that doubles the working one. An efficient algorithm that simulates such "doubled precision" in working precision is also provided. Numerical results that confirm the analysis and implementation are presented. C1 ARGONNE NATL LAB, DIV MATH & COMP SCI, ARGONNE, IL 60439 USA. RP RICE UNIV, DEPT MATH SCI, HOUSTON, TX 77251 USA. NR 14 TC 39 Z9 39 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1429 EI 1095-7170 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD DEC PY 1991 VL 28 IS 6 BP 1752 EP 1775 DI 10.1137/0728087 PG 24 WC Mathematics, Applied SC Mathematics GA GT028 UT WOS:A1991GT02800010 ER PT J AU MOSKOWITZ, PD FTHENAKIS, VM AF MOSKOWITZ, PD FTHENAKIS, VM TI A CHECKLIST OF SUGGESTED SAFE PRACTICES FOR THE STORAGE, DISTRIBUTION, USE AND DISPOSAL OF TOXIC AND HAZARDOUS GASES IN PHOTOVOLTAIC CELL PRODUCTION SO SOLAR CELLS LA English DT Article AB Many gases used in photovoltaic cell manufacture are inherently hazardous to human health. Thus, the risk to occupational and public health presented by these gases must be minimized through the use of engineering, administrative and personal control strategies. In this report a checklist of such controls is presented for the handling and storage, distribution, use and disposal of toxic gases used in photovoltaic cell manufacture. Because of the increasing emphasis being placed on controlling hazards of toxic gases, the checklist will probably expand over time. In this context, the authors welcome suggestions and revisions. RP MOSKOWITZ, PD (reprint author), BROOKHAVEN NATL LAB,BIOMED & ENVIRONM ASSESSMENT GRP,UPTON,NY 11973, USA. NR 13 TC 7 Z9 7 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6787 J9 SOL CELLS PD DEC PY 1991 VL 31 IS 6 BP 513 EP 525 DI 10.1016/0379-6787(91)90094-6 PG 13 WC Energy & Fuels SC Energy & Fuels GA GV555 UT WOS:A1991GV55500003 ER PT J AU GUPTA, BP ANDERSON, JV AF GUPTA, BP ANDERSON, JV TI SOLAR DETOXIFICATION OF HAZARDOUS-WASTE - AN OVERVIEW OF THE UNITED-STATES-DEPARTMENT-OF-ENERGY PROGRAM SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB To move the application of solar concentrating systems into the marketplace, the U.S. Department of Energy's (DOE) Office of Assistant Secretary for Conservation and Renewable Energy recently began a Solar Industrial Program. The primary emphasis within this program is to accelerate the development and testing of the solar detoxification systems for hazardous wastes and to reach commercial applications in the mid-1990s. Leading the implementation of this program, the Solar Energy Research Institute in Golden, Colorado, is working in conjunction with Sandia National Laboratories in Albuquerque, New Mexico. The program includes development of technology for solar detoxification of hazardous waste and advanced industrial applications. The solar detoxification investigations are in two different processes for destroying toxic wastes: solar detoxification of water at near ambient temperature using low solar concentration, and solar destruction of chemical wastes using high temperature and higher solar concentration. In the first area, a typical photocatalytic process is used, where water containing organic wastes is exposed to sunlight in the presence of a semiconductor catalyst such as titanium dioxide. Wastes are destroyed in a single step without first removing them from the water and the entire operation takes place on site. The second process is a high-temperature, high-flux process for destroying hazardous and toxic compounds which is a promising alternative to thermal treatments such as incineration. For solar detoxification technologies to have an impact on this timeframe they must move quickly from the laboratory to actual waste sites. The program is designed to propel these technologies from the laboratory to field experiments and into the hands of industry within the next five to seven years. RP GUPTA, BP (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 19 TC 14 Z9 14 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 40 EP 61 DI 10.1016/0165-1633(91)90047-O PG 22 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900006 ER PT J AU KLIMAS, PC DIVER, RB CHAVEZ, JM AF KLIMAS, PC DIVER, RB CHAVEZ, JM TI UNITED-STATES-DEPARTMENT-OF-ENERGY SOLAR RECEIVER TECHNOLOGY DEVELOPMENT SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB The United States Department of Energy (DOE), through Sandia National Laboratories, has been conducting a solar thermal receiver technology development program, which maintains a balance between analytical modeling, bench and small-scale testing, and experimentation conducted at scales representative of commercial-size equipment. Central receiver activities emphasize both molten salt-based systems and volumetric air devices. These receivers are expected to be utilized in solar power plants rated between 100 and 200 MW(e). Distributed receiver research focuses on liquid metal refluxing devices. These are intended to mate parabolic dish concentrators with Stirling-cycle engines in the 5 to 25 kW(e) power range. This paper describes recent progress in this development program and discusses future plans. RP KLIMAS, PC (reprint author), SANDIA NATL LABS,DIV SOLAR THERMAL ELECT TECHNOL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 30 TC 2 Z9 2 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 136 EP 150 DI 10.1016/0165-1633(91)90054-O PG 15 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900013 ER PT J AU KLIMAS, PC BECKER, M AF KLIMAS, PC BECKER, M TI STATUS OF 2ND-GENERATION CENTRAL RECEIVER TECHNOLOGIES SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB Fifteen years of solar thermal technology development have produced a considerable amount of knowledge relating to the production of electricity from central receiver power plants. This body of knowledge is under examination by researchers from the United States of America and the Federal Republic of Germany for the purpose of defining the next generation of central receiver power plants. It is expected that this second generation represents a significant step toward commercialization of such systems. During the course of the study, specific activities needed to realize this next-step technology have been defined. The study is an international team effort. Under the International Energy Agency's "Small Solar Power Systems" project,-researchers from DLR, Interatom, Sandia National Laboratories, and Bechtel have designed a study in which technologies relating to existing systems are quantified, logical next-step systems are characterized, and future potential advances are identified. The receiver concepts under investigation are: (1) salt-in-tube, (2) volumetric air, and (3) direct absorption salt. Two plant power performance levels are examined: 30 and 100 MW(e). Each concept is applied with common capacity factors, and types and sizes of heliostats at each performance level. Reliability and uncertainty analyses are also performed. Annual energy production figures are calculated using the SOLERGY computer code. Economic methodologies are mutually agreed upon in order that levelized energy cost calculations will be consistent among the power plants. During the course of this effort, further potential advances in central receiver technology have continued to become apparent. These possible areas for improvement are described. Trends in cost-of-energy as functions of plant annual energy production and receiver type are presented. Similar trends involving trough-based technologies are also given. C1 DLR,GERMAN AEROSP RES ESTAB,W-5000 COLOGNE 90,GERMANY. RP KLIMAS, PC (reprint author), SANDIA NATL LABS,DIV SOLAR THERMAL ELECT TECHNOL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 8 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 162 EP 171 DI 10.1016/0165-1633(91)90056-Q PG 10 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900015 ER PT J AU CHAVEZ, JM CHAZA, C AF CHAVEZ, JM CHAZA, C TI TESTING OF A POROUS CERAMIC ABSORBER FOR A VOLUMETRIC AIR RECEIVER SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB A new absorber for a volumetric air receiver was designed, built, and tested on an existing volumetric receiver test bed (200 kW(t)) at the Plataforma Solar de Almeria test facility in Spain. Volumetric air receivers are currently being investigated for use in solar central receiver power plants because of their inherent simplicity. The volumetric air receiver is a unique type of solar central receiver that uses a porous absorber (heat exchanger), on which the solar energy is concentrated and absorbed within its volume. Air flows through the absorber, convectively transferring energy from the absorber to the medium. Volumetric receivers have applications in electricity production, industrial process heat, and chemical processing. We designed this new volumetric receiver absorber to use a porous ceramic material. This material was selected because of its structural strength, high-temperature capability, and the potential for using smaller pieces to build up an absorber. The ceramic absorber was tested at the Plataforma Solar de Almeria with a solar flux of up to 824 kW/m2, and it produced outlet air temperatures of 730-degrees-C. The porous ceramic material has exhibited reasonable thermal efficiencies and excellent structural integrity in the high-flux, high-temperature solar environment. In this paper we summarize the design of and test results of the porous ceramic absorber. C1 CIEMAT,PLATAFORMA SOLAR ALMERIA,E-04200 ALMERIA,SPAIN. RP CHAVEZ, JM (reprint author), SANDIA NATL LABS,DIV SOLAR THERMAL ELECT TECHNOL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 12 TC 20 Z9 20 U1 1 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 172 EP 181 DI 10.1016/0165-1633(91)90057-R PG 10 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900016 ER PT J AU ALPERT, DJ MANCINI, TR HOUSER, RM GROSSMAN, JW SCHISSEL, P CARASSO, M JORGENSEN, G SCHEVE, M AF ALPERT, DJ MANCINI, TR HOUSER, RM GROSSMAN, JW SCHISSEL, P CARASSO, M JORGENSEN, G SCHEVE, M TI SOLAR CONCENTRATOR DEVELOPMENT IN THE UNITED-STATES SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY ID POLYMER AB Sandia National Laboratories leads the U.S. Department of Energy's solar concentrator development program in a joint effort with the Solar Energy Research Institute. The goal of DOE's program is to develop, build and test solar concentrators that are low in cost, have high performance, and long lifetimes. Efforts are currently focused on three areas: low-cost heliostats, point-focus parabolic dishes, and durable reflective films. The status and future plans of DOE's program in each area are reviewed. C1 SANDIA NATL LABS,DIV 6215,ALBUQUERQUE,NM 87185. US DOE,WASHINGTON,DC 20585. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP ALPERT, DJ (reprint author), SANDIA NATL LABS,DIV 6216,ALBUQUERQUE,NM 87185, USA. NR 29 TC 1 Z9 2 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 307 EP 319 DI 10.1016/0165-1633(91)90071-R PG 13 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900030 ER PT J AU BUCK, R MUIR, JF HOGAN, RE SKOCYPEC, RD AF BUCK, R MUIR, JF HOGAN, RE SKOCYPEC, RD TI CARBON-DIOXIDE REFORMING OF METHANE IN A SOLAR VOLUMETRIC RECEIVER REACTOR - THE CAESAR PROJECT SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB Solar reforming of methane with CO2 was successfully demonstrated with a direct absorption receiver/reactor on a parabolic dish capable of 150 kW solar power. The reactor, a volumetric absorber, consisted of a reticulated porous alumina foam disk coated with rhodium catalyst. The system was operated during both steady-state and solar transient (cloud passage) conditions. The total solar power absorbed reached values up to 97 kW and the maximum methane conversion was almost 70%. Receiver efficiencies ranged up to 85% and chemical efficiencies peaked at 54%. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BUCK, R (reprint author), DLR,GERMAN AEROSP RES ESTAB,INST TECH THERMODYNAM,PFAFFENWALDRING 38-40,W-7000 STUTTGART 80,GERMANY. NR 4 TC 82 Z9 88 U1 1 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 449 EP 463 DI 10.1016/0165-1633(91)90082-V PG 15 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900041 ER PT J AU ANDERSON, JV LINK, H BOHN, M GUPTA, B AF ANDERSON, JV LINK, H BOHN, M GUPTA, B TI DEVELOPMENT OF SOLAR DETOXIFICATION TECHNOLOGY IN THE USA - AN INTRODUCTION SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB The destruction of hazardous wastes is an attractive new application of solar technologies. Development of solar detoxification technologies is being undertaken by the U.S. Department of Energy as part of a unified project managed by the Solar Energy Research Institute (SERI) in conjunction with Sandia National Laboratories. The overall objectives of this effort are to identify and advance new applications for early utilization of solar technologies, and to address a growing national and international need for advanced, innovative technologies aimed at environmental clean-up. The technologies being developed are grouped into two categories, those that treat hazardous chemicals in aqueous solution and those that destroy chemicals in the gas phase. The specific goal of this project is the development of commercialized solar detoxification technology by the mid-1990s. Realization of this goal will require a strong industry interaction with the laboratories; thus, many of the most important technology development efforts are planned to be carried out by industrial groups. This paper will describe these technologies and the state of their development, list several application options, and describe the future program envisioned for this area. C1 SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401. NR 8 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 538 EP 549 DI 10.1016/0165-1633(91)90089-4 PG 12 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900048 ER PT J AU LEWANDOWSKI, A BINGHAM, C OGALLAGHER, J WINSTON, R SAGIE, D AF LEWANDOWSKI, A BINGHAM, C OGALLAGHER, J WINSTON, R SAGIE, D TI PERFORMANCE CHARACTERIZATION OF THE SERI HIGH-FLUX SOLAR FURNACE SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB This paper describes a unique, new solar furnace at the Solar Energy Research Institute (SERI) that can generate a wide range of flux concentrations to support research in areas including materials processing, high-temperature detoxification and high-flux optics. The furnace is unique in that it uses a flat, tracking heliostat along with a long focal length-to-diameter (f/D) primary concentrator in an off-axis configuration. The experiments are located inside a building completely outside the beam between the heliostat and primary concentrator. The long f/D ratio of the primary concentrator was designed to take advantage of a nonimaging secondary concentrator to significantly increase the flux concentration capabilities of the system. Results are reported for both the single-stage and two-stage configurations. C1 UNIV CHICAGO,CHICAGO,IL 60637. RP LEWANDOWSKI, A (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 5 TC 32 Z9 37 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 550 EP 563 DI 10.1016/0165-1633(91)90090-8 PG 14 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900049 ER PT J AU BLAKE, DM WEBB, J TURCHI, C MAGRINI, K AF BLAKE, DM WEBB, J TURCHI, C MAGRINI, K TI KINETIC AND MECHANISTIC OVERVIEW OF TIO2-PHOTOCATALYZED OXIDATION REACTIONS IN AQUEOUS-SOLUTION SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY ID HYDROXYL AB Destruction of trace organic compounds in water by photocatalytic oxidation over titanium dioxide is the subject of worldwide interest. In this paper we review chemical mechanisms that have been put forward to account for the observed reactions and identify some band gap and thermodynamic limitations that must be considered in developing a solar-driven process. Recent work will be discussed which tests predictions made by the mechanism concerning dependence of rates of destruction on light flux and on the presence of hydrogencarbonate ion, a known hydroxyl radical scavenger. RP BLAKE, DM (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 14 TC 73 Z9 78 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 584 EP 593 DI 10.1016/0165-1633(91)90092-Y PG 10 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900051 ER PT J AU ALPERT, DJ SPRUNG, JL PACHECO, JE PRAIRIE, MR REILLY, HE MILNE, TA NIMLOS, MR AF ALPERT, DJ SPRUNG, JL PACHECO, JE PRAIRIE, MR REILLY, HE MILNE, TA NIMLOS, MR TI SANDIA-NATIONAL-LABORATORIES WORK IN SOLAR DETOXIFICATION OF HAZARDOUS WASTES SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY ID AQUEOUS SUSPENSIONS; DEGRADATION; DIOXIDE; PHOTOCATALYSIS; METHANE AB Sandia National Laboratories is working with the Solar Energy Research Institute to develop and apply solar technology to the destruction of hazardous chemicals. The program is part of the United States Department of Energy's Solar Detoxification of Hazardous Waste Initiative. Sandia's efforts are focused on two distinct technologies for destroying chemical wastes: a low-temperature, photocatalytic process for destroying dilute organic compounds in water and a high-temperature, thermal-catalytic process that destroys organic wastes by steam reforming over a metal catalyst. In support of both areas, laboratory studies are performed to screen alternative concepts, to identify reaction products, and to quantify key processing parameters. Sandia's experiments are conducted in the field with sunlight at a scale approaching that needed for industrial applications. The objective of Sandia's efforts is to spur commercial application of these technologies by demonstrating their feasibility at this practical scale. C1 SANDIA NATL LABS,DIV 6217,ALBUQUERQUE,NM 87185. RP ALPERT, DJ (reprint author), SANDIA NATL LABS,DIV 6216,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 31 TC 24 Z9 24 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 594 EP 607 DI 10.1016/0165-1633(91)90093-Z PG 14 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900052 ER PT J AU GLATZMAIER, GC MILNE, TA TYNER, C SPRUNG, J AF GLATZMAIER, GC MILNE, TA TYNER, C SPRUNG, J TI INNOVATIVE SOLAR TECHNOLOGIES FOR TREATMENT OF CONCENTRATED ORGANIC WASTES SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY AB The Solar Energy Research Institute in Golden, Colorado, and Sandia National Laboratories in Albuquerque, New Mexico, are developing solar technology for the destruction of hazardous chemical wastes. The processes being investigated utilize concentrated solar flux to carry out photochemical oxidation of hazardous organic compounds or to provide energy for catalytic steam reforming of similar compounds. Laboratory work and experiments in solar furnaces have demonstrated the capability to effectively destroy a wide range of types of organic compounds utilizing these processes. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87125. RP GLATZMAIER, GC (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 0 TC 8 Z9 9 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 672 EP 673 DI 10.1016/0165-1633(91)90099-7 PG 2 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900058 ER PT J AU KUHN, P HUNT, A AF KUHN, P HUNT, A TI A NEW SOLAR SIMULATOR TO STUDY HIGH-TEMPERATURE SOLID-STATE REACTIONS WITH HIGHLY CONCENTRATED RADIATION SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH SYMP ON SOLAR HIGH-TEMPERATURE TECHNOLOGIES CY AUG 27-31, 1990 CL DAVOS, SWITZERLAND SP INT ENERGY AGCY ID CHEMISTRY AB A solar simulator facility for the study of high temperature and flux effects has been established at Lawrence Berkeley Laboratory. The primary components consist of a high pressure arc lamp and power supply, a precision ellipsoidal concentrator, positioning device and ancillary equipment. A 20 or 30 kW xenon arc lamp is mounted at the focus of a coated aluminum ellipsoid with a maximum diameter of 80 cm. Various reactors and other equipment can be positioned at the second focus of the ellipsoid. The radiant flux distribution in the region of the second focal point was determined with calorimetric measurements. Peak fluxes up to 16,000 kW/m2 were measured and the total flux in an area of 7 x 7 cm was determined to be about 3 kW for the 20 kW lamp. A concentric silica tubular flow through reactor was fabricated to study reactions in absorbing gas-particle mixtures initiated by direct irradiation. The thermal decomposition of Manganese(IV) dioxide was chosen as a test reaction. Small particles of MnO2 were dispersed in nitrogen by an agitated filter/cyclone entrainment device. After entrainment, the suspension flowed through the reactor that was placed at the focus of the lamp. The gas-particle suspension was preheated by a small tube furnace. The particles leaving the reactor were collected on polymer filters and analyzed by x-ray diffraction and thermoanalytic methods. The results indicate that the direct absorption particle receivers offer a possible technique to carry out high-temperature solar chemistry processing. An important issue relating to the reactor design is the residence time in the reaction zone. The time must be sufficient to carry out the desired reaction. Therefore the reactor should be designed to maximize the residence time in the peak flux region. A second important consideration in this approach is the method used to suspend the particles in the flowing gas-stream. Future experiments call for the use of alternative techniques to entrain particles to maximize their mass loading in the suspension and measurements with various types of manganese dioxide. The effect of size, morphology, and purity of the particles will be explored. Two additional improvements include the use of improved preheating of the particles as well as better methods to measure the temperature. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KUHN, P (reprint author), PAUL SCHERRER INST,SEKT HOCHTEMP SOLARCHEM,CH-5232 VILLIGEN,SWITZERLAND. NR 9 TC 24 Z9 25 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 24 IS 1-4 BP 742 EP 750 DI 10.1016/0165-1633(91)90107-V PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH269 UT WOS:A1991HH26900066 ER PT J AU STONE, JL AF STONE, JL TI RECENT ADVANCES IN THIN-FILM SOLAR-CELLS SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON PHOTOVOLTAIC SCIENCE AND ENGINEERING ( PVSEC-5 ) : RECENT TOPICS ON SOLAR PHOTOVOLTAIC MATERIALS CY NOV 26-30, 1990 CL KYOTO, JAPAN AB "What goes around, comes around," as the saying goes. Once again, the focus on renewable energy has come about as a result of the crisis mentality. Higher fossil fuel prices, uncertain supplies from the Middle East, and growing concerns for the environment have put clean sources of energy high on the public's agenda. Fortunately, over the last ten years research progress for the various photovoltaic options has been quietly, but steadily, going forward. Progress for all of the important thin-film options is reviewed in this paper, and future requirements in terms of expanded markets and larger production capacity are discussed. RP STONE, JL (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 0 TC 1 Z9 1 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 23 IS 2-4 BP 117 EP 128 DI 10.1016/0165-1633(91)90113-Y PG 12 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH483 UT WOS:A1991HH48300003 ER PT J AU GEE, JM AF GEE, JM TI STATUS OF CONCENTRATOR COLLECTOR AND HIGH-EFFICIENCY CONCENTRATOR CELL-DEVELOPMENT SO SOLAR ENERGY MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON PHOTOVOLTAIC SCIENCE AND ENGINEERING ( PVSEC-5 ) : RECENT TOPICS ON SOLAR PHOTOVOLTAIC MATERIALS CY NOV 26-30, 1990 CL KYOTO, JAPAN AB Photovoltaic concentrator collectors are an attractive option for utility-scale photovoltaic power plants. This paper reviews the current status of photovoltaic concentrator collector and cell development. Included in the review is a discussion of the economic motivation for concentrators, a summary of recent concentrator collector and cell development, and a description of a major new program to accelerate development and commercial introduction of concentrator collectors. RP GEE, JM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1633 J9 SOL ENERG MATER PD DEC PY 1991 VL 23 IS 2-4 BP 347 EP 355 DI 10.1016/0165-1633(91)90140-G PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary SC Energy & Fuels; Materials Science GA HH483 UT WOS:A1991HH48300030 ER PT J AU COON, SR CALAWAY, WF BURNETT, JW PELLIN, MJ GRUEN, DM SPIEGEL, DR WHITE, JM AF COON, SR CALAWAY, WF BURNETT, JW PELLIN, MJ GRUEN, DM SPIEGEL, DR WHITE, JM TI YIELDS AND KINETIC-ENERGY DISTRIBUTIONS OF SPUTTERED NEUTRAL COPPER CLUSTERS SO SURFACE SCIENCE LA English DT Article ID DIATOMIC-MOLECULES; ION-BOMBARDMENT; AR+-IONS; MASS-SPECTROMETRY; SURFACE-ANALYSIS; EMISSION; ATOMS; CU-2; SPECTROSCOPY; IONIZATION AB Neutral copper clusters up to Cu15 were observed from the sputtering of polycrystalline copper by normally incident 3.6 keV Ar+. This is the first observation of sputtered neutral clusters larger than Cu5. The sputtered neutral species were detected by laser post-ionization time-of-flight mass spectrometry. The absolute sputtering yield of Cu2 was determined to be 0.05 Cu2/Ar+. Sputtering yields of the larger clusters relative to the atom were estimated from their positionized concentrations and found to range from 10(-4) for Cu3 to 10(-9) for Cu11. The kinetic energy distributions of Cu, Cu2 and Cu3 were also measured. The energy distribution of the atoms agreed very well with the expected distribution from the Sigmund-Thompson model. The maxima in the energy distributions were in the order Cu3 > Cu2 > Cu. All three distributions had approximately the same high-energy dependence. Neither the single nor the multiple collision models that have been proposed to describe the cluster energy distributions appear to agree with our measurements. C1 ARGONNE NATL LAB,DIV CHEM & CHEM TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. RP COON, SR (reprint author), UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712, USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 35 TC 74 Z9 74 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD DEC PY 1991 VL 259 IS 3 BP 275 EP 287 DI 10.1016/0039-6028(91)90558-A PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA GW196 UT WOS:A1991GW19600015 ER PT J AU SHUSTOROVICH, E BELL, AT AF SHUSTOROVICH, E BELL, AT TI SYNTHESIS AND DECOMPOSITION OF AMMONIA ON TRANSITION-METAL SURFACES - BOND-ORDER-CONSERVATION-MORSE-POTENTIAL ANALYSIS SO SURFACE SCIENCE LA English DT Letter ID HETEROGENEOUS DECOMPOSITION; ADSORPTION; CHEMISORPTION; DISSOCIATION; MECHANISM; PLATINUM; KINETICS; NITROGEN; RHENIUM; FE(111) AB The mechanism of ammonia synthesis and decomposition on transition metal surfaces has been analyzed using the BOC-MP (bond-order-conservation-Morse-potential) method. The analysis is based on calculations of the heats of chemisorption, Q, for all adsorbed species and activation barriers, DELTA-E*, for all elementary reactions believed to be involved in the reaction N2 + H-2 reversible NH3 over Pt(111), Ru(001), Fe(110), Re(001). The relevant experimental values of Q and DELTA-E* agree well with the BOC-MP estimates. It is shown that along the periodic series Pt, Ru, Fe, Re, the dissociation activation barriers decrease but the recombination and desorption barriers increase. In particular, we find that on all the surfaces the largest activation barrier corresponds to the recombinative desorption 2N(s) --> N2. This step is projected to be the rate-determining process for ammonia decomposition, and Pt is projected to be the most efficient catalyst. For the dissociation N2 --> 2N(s), we find that the activation barrier sharply increases in the order Re less-than-or-equal-to Fe << Pt, which makes Pt surfaces incapable of catalyzing ammonia synthesis. These and other BOC-MP projections are in agreement with the results of mechanistic studies on Pt(111), Ru(001), and Fe(110). C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP SHUSTOROVICH, E (reprint author), EASTMAN KODAK CO,CORP RES LABS,ROCHESTER,NY 14650, USA. NR 19 TC 47 Z9 49 U1 5 U2 28 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD DEC PY 1991 VL 259 IS 3 BP L791 EP L796 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA GW196 UT WOS:A1991GW19600010 ER PT J AU BROWN, GM ALLISON, DP WARMACK, RJ JACOBSON, KB LARIMER, FW WOYCHIK, RP CARRIER, WL AF BROWN, GM ALLISON, DP WARMACK, RJ JACOBSON, KB LARIMER, FW WOYCHIK, RP CARRIER, WL TI ELECTROCHEMICALLY INDUCED ADSORPTION OF RADIOLABELED DNA ON GOLD AND HOPG SUBSTRATES FOR STM INVESTIGATIONS SO ULTRAMICROSCOPY LA English DT Article ID SCANNING TUNNELING MICROSCOPY; PYROLYTIC-GRAPHITE; NUCLEIC-ACIDS; DOUBLE HELIX; IMAGES; MOLECULES; SURFACE; WATER; PROBE AB In a scanning tunneling microscope (STM) electrochemical cell we have studied the effects of electrode potential on both the surface topography and the adsorption of deoxyribonucleic acid (DNA) to graphite and gold surfaces. Images of the surface of highly oriented pyrolytic graphite (HOPG). of the same area, in response to a positive increase in surface potential show degradation of the step edges with little change in the crystal plane. Images of the same area of a gold surface demonstrate the formation of and the progressive increase in nodular structures on the crystal planes, in response to increased potential, with little effect on the step edges. Using radio-labeled DNA we monitored electrochemical absorption onto HOPG and gold surfaces. Although at no applied potential and at negative surface potentials some DNA was bound, at positive potentials 3 to 5 times more DNA was incorporated onto both surfaces. DNA adsorbed to a surface at a positive potential was not removed by reversing the potential. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP BROWN, GM (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 25 TC 16 Z9 16 U1 2 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1991 VL 38 IS 3-4 BP 253 EP 264 DI 10.1016/0304-3991(91)90160-8 PG 12 WC Microscopy SC Microscopy GA GY230 UT WOS:A1991GY23000005 PM 1785142 ER PT J AU TAYLOR, RE AF TAYLOR, RE TI DEEP INELASTIC-SCATTERING - THE EARLY YEARS SO USPEKHI FIZICHESKIKH NAUK LA Russian DT Review RP TAYLOR, RE (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 36 TC 0 Z9 0 U1 0 U2 0 PU MEZHDUNARODNAYA KNIGA PI MOSCOW PA 39 DIMITROVA UL., 113095 MOSCOW, RUSSIA SN 0042-1294 J9 USP FIZ NAUK+ JI Uspekhi Fiz. Nauk PD DEC PY 1991 VL 161 IS 12 BP 39 EP 73 PG 35 WC Physics, Multidisciplinary SC Physics GA HC490 UT WOS:A1991HC49000002 ER PT J AU TSANG, CF TSANG, YW HALE, FV AF TSANG, CF TSANG, YW HALE, FV TI TRACER TRANSPORT IN FRACTURES - ANALYSIS OF FIELD DATA BASED ON A VARIABLE-APERTURE CHANNEL MODEL SO WATER RESOURCES RESEARCH LA English DT Article ID SINGLE FRACTURE; FLOW; MEDIA; ROCK AB A variable-aperture channel model is used as the basis to interpret data from a 3-year tracer transport experiment in fractured rocks. The data come from the so-called Stripa-3D experiment performed by Neretnieks and coworkers. Within the framework of the variable-aperture channel conceptual model, tracers are envisioned as traveling along a number of variable-aperture flow channels, whose properties are related to the mean bBAR and standard deviation sigma of the fracture aperture distribution. Two methods are developed to address the presence of strong time variation of the tracer injection flow rate in this experiment. The first approximates the early part of the injection history by an exponential decay function and is applicable to the early time tracer breakthrough data. The second is a deconvolution method involving the use of Toeplitz matrices and is applicable over the complete period of variable injection of the tracers. Both methods give consistent results. These results include not only estimates of bBAR and sigma, but also the number of channels involved in the tracer transport and their Peclet numbers and dispersivities. An interesting and surprising observation is that the data indicate that for each channel the Peclet number increases with the mean travel time; i.e., dispersivity decreases with mean travel time. The meaning of this trend is discussed in terms of the strong heterogeneity of the flow system. RP TSANG, CF (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 29 TC 50 Z9 52 U1 0 U2 6 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 DEC PY 1991 VL 27 IS 12 BP 3095 EP 3106 DI 10.1029/91WR02270 PG 12 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA GT972 UT WOS:A1991GT97200007 ER PT J AU MCCORD, JT AF MCCORD, JT TI APPLICATION OF 2ND-TYPE BOUNDARIES IN UNSATURATED FLOW MODELING SO WATER RESOURCES RESEARCH LA English DT Note ID POROUS-MEDIA AB Specified head and/or specified flux are typically employed as boundary conditions in numerical simulations involving unsaturated flow. Some modelers incorrectly refer to a specified flux condition as a second-type boundary. In the mathematical literature a second-type boundary is defined as a boundary along which the gradient of the dependent variable is specified. This note identifies physical scenarios in which a second-type boundary (specified gradient) may be the most appropriate boundary condition, discusses a procedure for implementing a specified gradient boundary condition in a flow code, and presents an application of the procedure in the simulation of two practical problems. RP MCCORD, JT (reprint author), SANDIA NATL LABS,DIV WASTE MANAGEMENT SYST 6416,ALBUQUERQUE,NM 87185, USA. NR 16 TC 30 Z9 32 U1 0 U2 4 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 DEC PY 1991 VL 27 IS 12 BP 3257 EP 3260 DI 10.1029/91WR02158 PG 4 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA GT972 UT WOS:A1991GT97200022 ER PT J AU BRYAN, AL COULTER, MC AF BRYAN, AL COULTER, MC TI CONSPECIFIC AGGRESSION IN A WOOD STORK COLONY IN GEORGIA SO WILSON BULLETIN LA English DT Note ID TAKEOVERS RP BRYAN, AL (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU WILSON ORNITHOLOGICAL SOC PI ANN ARBOR PA MUSEUM OF ZOOLOGY UNIV MICHIGAN, ANN ARBOR, MI 48109 SN 0043-5643 J9 WILSON BULL JI Wilson Bull. PD DEC PY 1991 VL 103 IS 4 BP 693 EP 697 PG 5 WC Ornithology SC Zoology GA GZ618 UT WOS:A1991GZ61800018 ER PT J AU GUREVICH, AV ZYBIN, KP LUKYANOV, AV NEBEL, R AF GUREVICH, AV ZYBIN, KP LUKYANOV, AV NEBEL, R TI CORRELATION-PROPERTIES OF MHD TURBULENCE SO ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI LA Russian DT Article ID DYNAMICS AB The correlation function of MHD turbulence, which exiting in a thin toroidal systems, was investigated. The conditions of existing of anomalous transport in reversed field pinch systems are determined. The dependence of correlation function on a conditions near boundary of stochastic zone is investigated. The exact correlation function is numerically calculated. This calculations are in a good agreement with theoretical formulae. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP GUREVICH, AV (reprint author), PN LEBEDEV PHYS INST,MOSCOW,USSR. RI Zybin, Kirill/K-8619-2015; Gurevich, Aleksandr/K-8668-2015 OI Gurevich, Aleksandr/0000-0003-1125-9774 NR 11 TC 4 Z9 4 U1 0 U2 0 PU MEZHDUNARODNAYA KNIGA PI MOSCOW PA 39 DIMITROVA UL., 113095 MOSCOW, RUSSIA SN 0044-4510 J9 ZH EKSP TEOR FIZ+ JI Zhurnal Eksperimentalnoi Teor. Fiz. PD DEC PY 1991 VL 100 IS 6 BP 1767 EP 1780 PG 14 WC Physics, Multidisciplinary SC Physics GA GX708 UT WOS:A1991GX70800006 ER PT J AU ANDERSON, IE FIGLIOLA, RS MORTON, H AF ANDERSON, IE FIGLIOLA, RS MORTON, H TI FLOW MECHANISMS IN HIGH-PRESSURE GAS ATOMIZATION SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID NITROGEN JETS; LIQUID LEAD; STREAMS AB Very fine (d < 10-mu-m) metal and alloy powders can be produced efficiently by a high pressure gas atomization (HPGA) technique. Rapid solidification processing, metal injection molding, thermal spraying and other emerging powder-processing approaches benefit from the use of such fine powders. This paper reports on the results of an investigation of gas atomization process dynamics with emphasis on the high pressure operating regime. The direct benefit of a better understanding of the process dynamics will be to permit a more informed selection of atomizer design and operating parameters as well as to further improve HPGA performance. C1 CLEMSON UNIV,CLEMSON,SC 29631. RP ANDERSON, IE (reprint author), AMES LAB,AMES,IA 50010, USA. NR 23 TC 40 Z9 43 U1 4 U2 18 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 NOV 30 PY 1991 VL 148 IS 1 BP 101 EP 114 DI 10.1016/0921-5093(91)90870-S PG 14 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GR153 UT WOS:A1991GR15300012 ER PT J AU BLAU, PJ AF BLAU, PJ TI AN OBSERVATION OF ROLE REVERSAL EFFECTS IN UNLUBRICATED SLIDING FRICTION AND WEAR TESTS OF ALUMINA AND SILICON-CARBIDE SO WEAR LA English DT Note RP BLAU, PJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 7 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 NOV 30 PY 1991 VL 151 IS 1 BP 193 EP 197 DI 10.1016/0043-1648(91)90357-Z PG 5 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GX075 UT WOS:A1991GX07500017 ER PT J AU MILBURN, MV PRIVE, GG MILLIGAN, DL SCOTT, WG YEH, J JANCARIK, J KOSHLAND, DE KIM, SH AF MILBURN, MV PRIVE, GG MILLIGAN, DL SCOTT, WG YEH, J JANCARIK, J KOSHLAND, DE KIM, SH TI 3-DIMENSIONAL STRUCTURES OF THE LIGAND-BINDING DOMAIN OF THE BACTERIAL ASPARTATE RECEPTOR WITH AND WITHOUT A LIGAND SO SCIENCE LA English DT Article ID DIRECTED CROSS-LINKING; EPIDERMAL GROWTH-FACTOR; HUMAN INSULIN-RECEPTOR; ELECTRON-DENSITY MAP; ESCHERICHIA-COLI; MACROMOLECULAR CRYSTALLOGRAPHY; SIGNAL TRANSDUCTION; SECONDARY STRUCTURE; WEISSENBERG CAMERA; TAR CHEMORECEPTOR AB The three-dimensional structure of an active, disulfide cross-linked dimer of the ligand-binding domain of the Salmonella typhimurium aspartate receptor and that of an aspartate complex have been determined by x-ray crystallographic methods at 2.4 and 2.0 angstrom (angstrom) resolution, respectively. A single subunit is a four-alpha-helix bundle with two long amino-terminal and carboxyl-terminal helices and two shorter helices that form a cylinder 20 angstrom in diameter and more than 70 angstrom long. The two subunits in the disulfide-bonded dimer are related by a crystallographic twofold axis in the apo structure, but by a noncrystallographic twofold axis in the aspartate complex structure. The latter structure reveals that the ligand binding site is located more than 60 angstrom from the presumed membrane surface and is at the interface of the two subunits. Aspartate binds between two alpha-helices from one subunit and one alpha-helix from the other in a highly charged pocket formed by three arginines. The comparison of the apo and aspartate complex structures shows only small structural changes in the individual subunits, except for one loop region that is disordered, but the subunits appear to change orientation relative to each other. The structures of the two forms of this protein provide a step toward understanding the mechanisms of transmembrane signaling. C1 UNIV CALIF BERKELEY,DEPT BIOCHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Prive, Gilbert/A-3039-2008 FU NIAID NIH HHS [AI 30725]; NIDDK NIH HHS [DK09765] NR 47 TC 355 Z9 356 U1 2 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 NOV 29 PY 1991 VL 254 IS 5036 BP 1342 EP 1347 DI 10.1126/science.1660187 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GR777 UT WOS:A1991GR77700045 PM 1660187 ER PT J AU VAUGHAN, GBM HEINEY, PA FISCHER, JE LUZZI, DE RICKETTSFOOT, DA MCGHIE, AR HUI, YW SMITH, AL COX, DE ROMANOW, WJ ALLEN, BH COUSTEL, N MCCAULEY, JP SMITH, AB AF VAUGHAN, GBM HEINEY, PA FISCHER, JE LUZZI, DE RICKETTSFOOT, DA MCGHIE, AR HUI, YW SMITH, AL COX, DE ROMANOW, WJ ALLEN, BH COUSTEL, N MCCAULEY, JP SMITH, AB TI ORIENTATIONAL DISORDER IN SOLVENT-FREE SOLID C70 SO SCIENCE LA English DT Article AB The high-temperature structure of solvent-free C70 has been determined with high-resolution x-ray powder diffraction and electron microscopy. Samples crystallized from solution form hexagonal close-packed crystals that retain an appreciable amount of residual toluene, even after prolonged heating. Samples prepared by sublimation, which contain no detectable solvent, are primarily face-centered cubic with some admixture of a hexagonal phase. The relative volume of the hexagonal phase can be further reduced by annealing. The structures of both phases are described by a model of complete orientational disorder. The cubic phase contains an appreciable density of stacking faults along the [111] direction. C1 UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. DREXEL UNIV,DEPT CHEM,PHILADELPHIA,PA 19104. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RI Vaughan, Gavin/B-1479-2010 NR 19 TC 229 Z9 229 U1 5 U2 22 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 29 PY 1991 VL 254 IS 5036 BP 1350 EP 1353 DI 10.1126/science.254.5036.1350 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GR777 UT WOS:A1991GR77700047 PM 17773604 ER PT J AU MACDONALD, RG LIU, KP AF MACDONALD, RG LIU, KP TI INELASTIC-SCATTERING OF NCO(X2-PI) + HE - PROTOTYPICAL ROTATIONAL STATE DISTRIBUTIONS FOR HUND CASE (A) RADICALS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ROTATIONAL-EXCITATION; CROSSED-BEAM; COLLISIONS; STATE; MOLECULES; DYNAMICS; O-2; NO; CN; PI AB State-resolved cross sections for the inelastic scattering of the linear triatomic radical NCO(X approximately 2II3/2) by He have been measured in a pulsed, cross-beam apparatus at a collision energy of 3.74 kcal mol-1. Dramatically different rotational state distributions were found depending on whether or not the spin-orbit state of NCO was preserved in the collision. It is proposed that the observed different distributions are generic to the inelastic scattering of a Hund's case (a) 2II radical, arising naturally as a dynamical consequence of the Renner-Teller effect. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Liu, Kopin/F-7929-2012 NR 24 TC 14 Z9 14 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 28 PY 1991 VL 95 IS 24 BP 9630 EP 9633 DI 10.1021/j100177a007 PG 4 WC Chemistry, Physical SC Chemistry GA GR846 UT WOS:A1991GR84600007 ER PT J AU MCCLEAN, RE SIMONS, JW OLDENBORG, RC AF MCCLEAN, RE SIMONS, JW OLDENBORG, RC TI PRODUCTION AND DECAY OF GROUND-STATE PB(G) FROM THE 308-NM PHOTODISSOCIATION OF PBI2(G) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LEAD ATOMS; ORDER REACTIONS; FLUORESCENCE; PB(63P0); RECOMBINATION; ABSORPTION; EXCITATION; METAL AB An extensive investigation of the production and decay of ground-state lead atoms from the 308-nm XeCl excimer laser photodissociation of PbI2(g) is reported. The laser fluence dependences of the Pb(g) and PbI(g) yields along with energetic considerations suggest that Pb(g) is produced by a two-photon process and PbI(g) is produced by a one-photon process. Pb decay profiles as a function of argon pressure, PbI2(g) number density, laser fluence, and cell temperature were determined. The rates of Pb decay were found to be approximately second order in Pb. The second-order rate constants were found to increase with PbI2(g) number density, to not change with argon pressure, and to decrease with increasing laser fluence and cell temperature. These results are consistent with a complex mechanism that can be described as the PbI2(g)-catalyzed recombinations of Pb and PbI with I involving an exothermic preequilibrium, I + PbI2 = PbI3, with DELTA-H almost-equal-to -22 +/- 6 kcal/mol. The proposed mechanism is capable of reproducing the observed Pb(g) decay profiles under all conditions studied when reasonably large values of rate coefficients for the various elementary steps are used. C1 NEW MEXICO STATE UNIV,DEPT CHEM,LAS CRUCES,NM 88003. UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. NR 32 TC 2 Z9 2 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 28 PY 1991 VL 95 IS 24 BP 9853 EP 9859 DI 10.1021/j100177a044 PG 7 WC Chemistry, Physical SC Chemistry GA GR846 UT WOS:A1991GR84600044 ER PT J AU CHO, SW WAGNER, AF GAZDY, B BOWMAN, JM AF CHO, SW WAGNER, AF GAZDY, B BOWMAN, JM TI THE ADDITION AND DISSOCIATION REACTION H + CO REVERSIBLE HCO .3. IMPLEMENTATION OF ISOLATED RESONANCE RRKM THEORY WITH EXACT QUANTUM STUDIES FOR J = O SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CO REVERSIBLE HCO; ROTATIONAL DISTRIBUTIONS; HYDROGEN-ATOMS; SCATTERING; CONSTANTS; H+CO AB We report the implementation of isolated resonance RRKM theory for the titled reaction with resonance characterizations derived from exact quantum dynamics calculations. Only nonrotating HCO is considered, i.e., total angular momentum of zero. The sensitivity of the resonance widths on the pressure dependence in the approach to the low pressure limit is examined. This discussion includes the effect of tunneling i.e., very narrow resonances, on the value of the low-pressure limit. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322. NR 19 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 NOV 28 PY 1991 VL 95 IS 24 BP 9897 EP 9900 DI 10.1021/j100177a052 PG 4 WC Chemistry, Physical SC Chemistry GA GR846 UT WOS:A1991GR84600052 ER PT J AU ALVARADOSWAISGOOD, AE BARR, MK HAY, PJ REDONDO, A AF ALVARADOSWAISGOOD, AE BARR, MK HAY, PJ REDONDO, A TI ABINITIO QUANTUM CHEMICAL CALCULATIONS OF ALUMINUM SUBSTITUTION IN ZEOLITE ZSM-5 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MOLECULAR-ORBITAL METHODS; VALENCE BASIS-SETS; MECHANICAL CALCULATIONS; STRUCTURE REFINEMENT; CRYSTAL-STRUCTURE; O-AL; ELEMENTS; FRAMEWORK; MODELS; SILICATES AB We have performed ab initio quantum mechanical calculations in monomeric clusters modeling the 12 different T sites of zeolite ZSM-5. By comparing the results of calculations that use minimum basis sets with those that employ valence double-zeta bases, we conclude that minimum basis sets are unreliable for predicting relative replacement energies for the substitution of silicon by aluminum atoms at the T sites of the zeolite. From these calculations, we also conclude that small differences in the bond lengths and angles can significantly alter the order of the sites with respect to the replacement energies. From calculations using valence double-zeta basis sets on T(OH)4 monomers, we conclude that, in the absence of protons or other ions, the most favorable sites for Al substitution in zeolite ZSM-5 are the T6, T12, and T9 sites, whereas the least favorable site is T3. However, the least favorable and most favorable sites only differ by 3.3 kcal/mol. We also present a simple empirical model that is capable of reproducing the results of the ab initio calculations. This model gives the replacement energy in terms of the bond lengths and bond angles about each site. C1 UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. RP ALVARADOSWAISGOOD, AE (reprint author), AMOCO RES CTR, POB 3011, NAPERVILLE, IL 60566 USA. NR 27 TC 83 Z9 83 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 28 PY 1991 VL 95 IS 24 BP 10031 EP 10036 DI 10.1021/j100177a077 PG 6 WC Chemistry, Physical SC Chemistry GA GR846 UT WOS:A1991GR84600077 ER PT J AU SATIJA, SK SWANSON, B ECKERT, J GOLDSTONE, JA AF SATIJA, SK SWANSON, B ECKERT, J GOLDSTONE, JA TI HIGH-PRESSURE RAMAN-SCATTERING AND INELASTIC NEUTRON-SCATTERING STUDIES OF TRIAMINOTRINITROBENZENE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VIBRATION-SPECTRA; 1,3,5-TRIAMINO-2,4,6-TRINITROBENZENE; SPECTROSCOPY; EXPLOSIVES AB We report the results of the effect of static pressure on the Raman spectrum of TATB up to pressures of 160 kbar and deuterated TATB (DTATB) up to pressures of 65 kbar. Both these solids are found to be remarkably stable to high densities. We observe unusual pressure dependence of the delta-NO2, v(C-N), and v(N-O) modes and attribute these changes to variation in NH2/NO2 coupling as the pressure is increased. Both of these aspects of TATB may be important in contributing to the insensitivity of TATB to shock-initiated detonation. We also find that, unlike at ambient pressures, TATB is quite insensitive to photolysis when exposed to static pressures exceeding 15 kbar, indicating that photolysis of TATB involves a positive activation volume. In addition, we present inelastic neutron scattering data as well as some assignments of TATB and two related substituted anilines, p-nitroaniline and p-chloroaniline. These clearly demonstrate the strong vibrational coupling between NH2 and NO2 groups. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 19 TC 26 Z9 26 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 28 PY 1991 VL 95 IS 24 BP 10103 EP 10109 DI 10.1021/j100177a088 PG 7 WC Chemistry, Physical SC Chemistry GA GR846 UT WOS:A1991GR84600088 ER PT J AU MALIK, IJ HRBEK, J AF MALIK, IJ HRBEK, J TI HIGH COVERAGES AND SUBSURFACE PENETRATION OF OXYGEN ON RU(001) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SURFACE; ADSORPTION; RUTHENIUM; HYDROGEN; PT(111); PD(111); CO AB Interaction of NO2, an effective source of atomic oxygen, with a Ru(001) single crystal face was studied at substrate temperatures 400-800 K. We present thermal desorption spectroscopy data indicating that up to 40 oxygen monolayers can be accommodated within the surface and subsurface regions. Once oxygen penetrates below the surface, fragments containing Ru atoms (RuO(x), x = 0-3) are detected during desorption and O2 desorbs with near-zero-order kinetics. We briefly discuss these experimental results in terms of a model for subsurface penetration of oxygen on transition metals. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Hrbek, Jan/I-1020-2013 NR 21 TC 43 Z9 43 U1 1 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 NOV 28 PY 1991 VL 95 IS 24 BP 10188 EP 10190 DI 10.1021/j100177a102 PG 3 WC Chemistry, Physical SC Chemistry GA GR846 UT WOS:A1991GR84600102 ER PT J AU LARIN, SA TKACHOV, FV VERMASEREN, JAM AF LARIN, SA TKACHOV, FV VERMASEREN, JAM TI THE O(ALPHA-3S) QCD CORRECTION TO THE LOWEST MOMENT OF THE LONGITUDINAL STRUCTURE-FUNCTION IN DEEP INELASTIC ELECTRON NUCLEON-SCATTERING SO PHYSICS LETTERS B LA English DT Article ID FREE GAUGE-THEORIES; LEADING ORDER; COEFFICIENT FUNCTIONS; 2ND-ORDER CONTRIBUTIONS; WILSON OPERATORS; PARTON DENSITIES; SUM-RULES; ALGORITHM; SCHEME AB We present the analytic leading-twist three-loop perturbative QCD correction to the moment integral 0(1) dx F(L)p-n(x, Q2) of the non-singlet longitudinal structure function F(L) of the deep inelastic electron-nucleon scattering. It provides quantitative information on uncertainties of pQCD predictions for R(x, Q2) = sigma(L)/sigma(T). C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP LARIN, SA (reprint author), NATL INST NUCL PHYS & HIGH ENERGY PHYS,POB 41882,1009 DB AMSTERDAM,NETHERLANDS. NR 34 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 28 PY 1991 VL 272 IS 1-2 BP 121 EP 126 DI 10.1016/0370-2693(91)91023-O PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GV618 UT WOS:A1991GV61800022 ER PT J AU ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W 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 VIDAL, M WILHELM, M WILKES, J VENKATARAMANIA, H 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 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 VIDAL, M WILHELM, M WILKES, J VENKATARAMANIA, H WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI DISTRIBUTIONS OF CHARGED HADRONS OBSERVED IN DEEP-INELASTIC MUON DEUTERIUM SCATTERING AT 490-GEV SO PHYSICS LETTERS B LA English DT Article ID TRANSVERSE-MOMENTUM; FRAGMENTATION; PROTON; Q2; NU AB Longitudinal and transverse momentum spectra of final state hadrons produced in deep-inelastic muon-deuterium scattering at incident muon energy of 490 GeV have been measured up to a hadronic center of mass energy, of 30 GeV. The longitudinal distributions agree well with data from earlier muon-nucleon scattering experiments; these distributions tend to increase in steepness as the center of mass energy increases. Comparisons with e+ e- data at comparable center of mass energies indicate slight differences. The transverse momentum distributions show an increase in mean p(T)2 with an increase in the center of mass energy. C1 UNIV MARYLAND,COLLEGE PK,MD 20742. MIT,CAMBRIDGE,MA 02139. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV GESAMTHSCH WUPPERTAL,W-5600 WUPPERTAL 1,GERMANY. HARVARD UNIV,CAMBRIDGE,MA 02138. MAX PLANCK INST,W-8000 MUNICH,GERMANY. YALE UNIV,NEW HAVEN,CT 06520. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. STANISLAW STASZIC UNIV MIN & MET,INST NUCL PHYS,PL-30059 KRAKOW,POLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. NORTHWESTERN UNIV,EVANSTON,IL 60208. RP ADAMS, MR (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. NR 20 TC 17 Z9 17 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 NOV 28 PY 1991 VL 272 IS 1-2 BP 163 EP 168 DI 10.1016/0370-2693(91)91030-Y PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GV618 UT WOS:A1991GV61800029 ER PT J AU HALLEWELL, RA IMLAY, KC LEE, P FONG, NM GALLEGOS, C GETZOFF, ED TAINER, JA CABELLI, DE TEKAMPOLSON, P MULLENBACH, GT COUSENS, LS AF HALLEWELL, RA IMLAY, KC LEE, P FONG, NM GALLEGOS, C GETZOFF, ED TAINER, JA CABELLI, DE TEKAMPOLSON, P MULLENBACH, GT COUSENS, LS TI THERMOSTABILIZATION OF RECOMBINANT HUMAN AND BOVINE CUZN SUPEROXIDE DISMUTASES BY REPLACEMENT OF FREE CYSTEINES SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID DIFFERENTIAL SCANNING CALORIMETRY; STABILITY; PROTEIN; COPPER C1 Scripps Res Inst, RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. RP HALLEWELL, RA (reprint author), CHIRON CORP, 4560 HORTON ST, EMERYVILLE, CA 94608 USA. FU NIGMS NIH HHS [R01 GM23656-10, GM39345] NR 24 TC 68 Z9 69 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 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD NOV 27 PY 1991 VL 181 IS 1 BP 474 EP 480 DI 10.1016/S0006-291X(05)81443-3 PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GR961 UT WOS:A1991GR96100071 PM 1958215 ER PT J AU ROODT, A SULLIVAN, JC MEISEL, D DEUTSCH, E AF ROODT, A SULLIVAN, JC MEISEL, D DEUTSCH, E TI ELECTRON-TRANSFER REACTIONS OF TECHNETIUM AND RHENIUM COMPLEXES .3. PULSE-RADIOLYSIS STUDIES ON TRANS-[MIIIX2(DMPE)2]+ AND [MI(DMPE)3]+ COMPLEXES IN AQUEOUS AND AQUEOUS SURFACTANT MEDIA, WHERE M = TC OR RE, X = CL OR BR, AND DMPE = 1,2-BIS(DIMETHYLPHOSPHINO)ETHANE SO INORGANIC CHEMISTRY LA English DT Article ID PERFUSION IMAGING AGENTS; RESOLVED OPTICAL-SPECTRA; TV-SCANNING METHOD; CHEMISTRY; ELECTROCHEMISTRY; TRANSIENTS AB Pulse radiolytic techniques have been employed to study the rate of reactions of the strong reductant e(aq)- and the strong oxidant Cl2- with lipophilic, cationic Tc and Re complexes in aqueous and aqueous surfactant media. In aqueous media the reactions of the M(III) complexes trans-[Re(III)Cl2(DMPE)2]+, trans-[Re(III)Br2(DMPE)2]+, and trans-[Tc(III)Cl2(DMPE)2]+ have been studied with both reagents, while the reaction of the M(I) complexes [Re(I)(DMPE)3]+ and [Tc(I)(DMPE)3]+ have been studied with Cl2-. Oxidation of the M(I) complexes cleanly yields the corresponding [M(II)(DMPE)3]+ species by an outer-sphere mechanism, whereas oxidation of the M(III) complexes appears to proceed by more complicated pathways, which could involve both outer-sphere electron transfer as well as oxidative addition. All reactions proceed at, or near, the diffusion-controlled limit. The positively charged surfactant CTAB (hexadecyltrimethylammonium bromide) and the uncharged surfactant Triton X-100 (alpha-[p-(1,1,3,3-tetramethylbutyl)phenyl]-omega-hydroxypolyoxyethylene(9.5)) have little or no effect on the rates of any of the reactions studied. However, micelles formed from the negatively charged surfactant SDS (sodium dodecyl sulfate) exert a dramatic effect on reaction rates by effectively sequestering the cationic complexes and rendering them relatively unavailable for reaction with the anionic reagents e(aq)- and Cl2-. While the anionic reagents can penetrate the SDS micelles, the cationic complexes do not appear to be released from the micelle during the lifetime of the anionic radicals (ca. 10(2) mu-s). These results have implications for the use of surfactants in electrochemical studies, as well as for the pharmacokinetics of cationic complexes of interest to nuclear medicine. C1 UNIV CINCINNATI,DEPT CHEM,BIOMED CHEM RES CTR,CINCINNATI,OH 45221. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Roodt, Andreas/F-4696-2012 OI Roodt, Andreas/0000-0002-7349-6436 NR 27 TC 11 Z9 12 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 27 PY 1991 VL 30 IS 24 BP 4545 EP 4549 DI 10.1021/ic00024a016 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GR813 UT WOS:A1991GR81300016 ER PT J AU NEWMAN, RA MARTIN, DS DALLINGER, RF WOODRUFF, WH STIEGMAN, AE CHE, CM SCHAEFER, WP MISKOWSKI, VM GRAY, HB AF NEWMAN, RA MARTIN, DS DALLINGER, RF WOODRUFF, WH STIEGMAN, AE CHE, CM SCHAEFER, WP MISKOWSKI, VM GRAY, HB TI VIBRATIONAL AND ELECTRONIC-SPECTRA OF [PT2(SO4)4]2- COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID BONDED PLATINUM(III) COMPOUNDS; METAL-METAL BOND; EXCITED-STATES; STRUCTURAL CHARACTERIZATION; CRYSTAL-STRUCTURES; ALPHA-PYRIDONE; AXIAL-LIGAND; DINUCLEAR; ION; DIRHODIUM(II) AB The vibrational and electronic spectra of axially ligated sulfate-bridged binuclear platinum complexes ([Pt2(SO4)4L2]n-: L = OH2, DMSO, n = 2; L = Cl, Br, n = 4) have been studied. Raman spectra acquired with near-UV excitation show bands assigned to Pt-O(sulfate) stretching (300-350-cm-1 region) for all complexes, while bands assigned to Pt-Pt and Pt-L stretching are seen for complexes (L = Cl, Br) that display preresonance Raman scattering within intense near-UV absorption bands assigned to the sigma(L) --> sigma*(Pt2) electronic transition. Weaker electronic absorptions are assigned as metal-metal 1(sigma --> sigma*) (near 220 nm for L = OH2, Cl) and d-pi --> d-sigma*(Pt2) (350-500 nm). Single-crystal polarized absorption spectra (L = OH2, DMSO) show that the weak absorption system in the 350-500-nm region consists of three z-polarized (metal-metal axis) bands and an x,y-polarized band. The L = OH2, Cl complexes show weak emission bands in the 695-750-nm region when excited at 77 K with near-UV light. These emission bands are similar to those observed for [Pt2(HPO4)4L2]n- (L = OH2, n = 2; L = Cl, n = 4) complexes. The emission lifetimes for the sulfate-bridged complexes (450 +/- 50 ns, L = OH2; 290 +/- 20 ns, L = Cl) are much shorter, and the emission intensities are much weaker, than the corresponding properties of the phosphate-bridged complexes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. WABASH COLL,DEPT CHEM,CRAWFORDSVILLE,IN 47933. CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,PASADENA,CA 91125. UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & STRUCT CHEM GRP INC4,LOS ALAMOS,NM 87544. NR 45 TC 14 Z9 14 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 27 PY 1991 VL 30 IS 24 BP 4647 EP 4654 DI 10.1021/ic00024a037 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GR813 UT WOS:A1991GR81300037 ER PT J AU WOO, LK MAURYA, MR AF WOO, LK MAURYA, MR TI RATIONAL DESIGN OF LINEAR TRINUCLEAR METAL-COMPLEXES SO INORGANIC CHEMISTRY LA English DT Note ID COPPER COMPLEX; IONS; PORPHYRIN; LIGANDS; OXIDASE C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP WOO, LK (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 30 TC 12 Z9 12 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 NOV 27 PY 1991 VL 30 IS 24 BP 4671 EP 4673 DI 10.1021/ic00024a042 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GR813 UT WOS:A1991GR81300042 ER PT J AU LIN, SJ HUANG, JY LING, JW CHEN, CT SHEN, YR AF LIN, SJ HUANG, JY LING, JW CHEN, CT SHEN, YR TI OPTICAL PARAMETRIC AMPLIFICATION IN A LITHIUM TRIBORATE CRYSTAL TUNABLE FROM 0.65 TO 2.5-MU SO APPLIED PHYSICS LETTERS LA English DT Article ID BARIUM BORATE; GENERATION; LIB3O5 AB We investigate the phase-matching properties and the performances of lithium triborate (LBO) crystals, angle- and temperature-tuned to achieve type-I phase matching for ps, high-power, tunable optical parametric amplification (OPA). A novel retracing behavior was observed in the tuning curves of the LBO OPA. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,DIV MAT SCI,BERKELEY,CA 94720. RP LIN, SJ (reprint author), CHINESE ACAD SCI,FUJIAN INST RES STRUCT MATTER,FUZHOU,PEOPLES R CHINA. NR 10 TC 54 Z9 56 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 NOV 25 PY 1991 VL 59 IS 22 BP 2805 EP 2807 DI 10.1063/1.105866 PG 3 WC Physics, Applied SC Physics GA GR169 UT WOS:A1991GR16900011 ER PT J AU BUTLER, MA BUSS, RJ SEAGER, CH AF BUTLER, MA BUSS, RJ SEAGER, CH TI SWELLING OF PLASMA-POLYMERIZED TETRAFLUOROETHYLENE FILMS SO APPLIED PHYSICS LETTERS LA English DT Article AB Swelling of micrometer thick films of plasma-polymerized tetrafluoroethylene has been measured for a range of solvents using an optical-interferometric technique. For low gas-phase concentrations of the solvent, the swelling is found to correlate with the ionization potential of the solvent. Photothermal deflection spectroscopy of the films shows optical absorption in the infrared, which changes with exposure to different solvents. Both of these results suggest weak electron transfer from the solvent to the polymer as the dominant interaction mechanism. RP BUTLER, MA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 25 PY 1991 VL 59 IS 22 BP 2817 EP 2819 DI 10.1063/1.106403 PG 3 WC Physics, Applied SC Physics GA GR169 UT WOS:A1991GR16900015 ER PT J AU LI, Q OSTENSON, JE FANG, MM FINNEMORE, DK AF LI, Q OSTENSON, JE FANG, MM FINNEMORE, DK TI ROBUST SUPERCONDUCTING TAPES BASED ON BI2SR2CA2CU3O10-DELTA SO APPLIED PHYSICS LETTERS LA English DT Article AB A rugged conductor based on the Bi2Sr2Ca2Cu3O10-delta has been developed by dispersing Ag throughout the matrix on a micrometer scale. The Ag seems to effectively blunt crack tips and provides regions for plastic flow. The performance degrades relatively little with the strains of handling, soldering and quenching to 77 K. Tapes having a critical current density of 4,500 A/cm2 at 77 K and zero field will show over 20 000 A/cm2 at 4.2 K and zero field. At 20 T for the field perpendicular to the tape surface, these conductors show 2 800 A/cm2 at 4.2 K and 2 200 A/cm2 at 20 K. The critical current density falls roughly linearly with strain and decreases from about 22 000 A/cm2 at zero strain to about 10 000 A/cm2 at 1.0% bending strain. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP LI, Q (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 6 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 25 PY 1991 VL 59 IS 22 BP 2895 EP 2897 DI 10.1063/1.105844 PG 3 WC Physics, Applied SC Physics GA GR169 UT WOS:A1991GR16900041 ER PT J AU WARREN, WL LENAHAN, PM AF WARREN, WL LENAHAN, PM TI E-CENTERS AND NITROGEN-RELATED DEFECTS IN SILICON DIOXIDE FILMS - COMMENT SO APPLIED PHYSICS LETTERS LA English DT Letter C1 PENN STATE UNIV,UNIV PK,PA 16802. RP WARREN, WL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 25 PY 1991 VL 59 IS 22 BP 2904 EP 2905 DI 10.1063/1.105847 PG 2 WC Physics, Applied SC Physics GA GR169 UT WOS:A1991GR16900044 ER PT J AU ZAVADIL, KR INGERSOLL, D ROGERS, JW AF ZAVADIL, KR INGERSOLL, D ROGERS, JW TI ELECTROCHEMICAL AND SURFACE SPECTROSCOPIC INVESTIGATION OF COPPER(111) FILMS ON RUTHENIUM(0001) SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID AUGER-SPECTROSCOPY; RU(0001) SURFACE; ADSORPTION; OXYGEN; CU; ELECTRODEPOSITION; MONOLAYER; HYDROGEN; GROWTH; IODINE AB The direct coupling of electrochemical and ultrahigh vacuum surface spectroscopic probes has been employed to study Cu(111) films deposited in vacuum on an Ru(0001) substrate. A quantitative correlation was found for Cu coverage measurements made in vacuum and in solution using thermal desorption spectroscopy and linear sweep voltammetry. This quantitative correlation indicates that the Cu overlayer pseudomorphic structure generated in vacuum is retained or restored upon immersion in solution. Equivalent amounts of charge were measured for vacuum-deposited and electrodeposited Cu monolayer films, indicative of pseudomorphic initial growth of Cu films in solution. A disparity was found in the energetics of thermal desorption and anodic dissolution of Cu of ca. 8 kJ mol-1, indicative of a greater stability of monolayer versus bulk Cu in solution compared with vacuum. RP ZAVADIL, KR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 27 TC 15 Z9 15 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD NOV 25 PY 1991 VL 318 IS 1-2 BP 223 EP 233 DI 10.1016/0022-0728(91)85305-9 PG 11 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA HE120 UT WOS:A1991HE12000016 ER PT J AU BIRSS, VI ELZANOWSKA, H GOTTESFELD, S AF BIRSS, VI ELZANOWSKA, H GOTTESFELD, S TI QUARTZ CRYSTAL MICROBALANCE MEASUREMENTS DURING OXIDATION REDUCTION OF HYDROUS IR OXIDE ELECTRODES SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID THIN-FILMS; IRIDIUM; GROWTH; STATE; REDOX; ELECTROCATALYSIS; POLYANILINE; TRANSPORT; ANODES; MODEL AB QCMB data were obtained for Ir oxide films formed by standard potential cycling methods on an Ir sputter-coated quartz crystal. In sulfuric acid solutions, the mass change of the electrode in a single potential sweep was found to vary linearly with the oxide film charge density, obtained under equilibrium conditions, indicating that no artifacts due to a significant degree of flexibility of the surface film were being introduced in this solution. In sulfuric acid solutions, the mass of the oxide film increased/decreased by ca. 6 g per mole of Ir sites being reduced/oxidized. This is consitent with the injection of 1.5 H+ and 0.25 SO42- per electron during reduction, as predicted from the unusual ca. 90 mV pH dependence usually observed, and the concurrent loss of 1 H2O. In KOH solutions, the mass change is smaller and is in the opposite direction from that in acidic media. The oxide film loses ca. 3-4 g per mole of Ir sites during reduction, which would be consistent with the expulsion of OH- and a small amount of K+, together with the gain of one H2O during the negative step. These QCMB results confirm that hydrous Ir oxide films exhibit many of the characteristics of a number of polymer-modified electrodes, and provide support for the involvement of solvent and the injection/expulsion of counter ions in addition to H+/OH- during the oxidation/reduction of Ir oxide films. C1 UNIV CALIF LOS ALAMOS SCI LAB,ELECTR RES GRP,LOS ALAMOS,NM 87545. RP BIRSS, VI (reprint author), UNIV CALGARY,DEPT CHEM,CALGARY T2N 1N4,ALBERTA,CANADA. NR 25 TC 34 Z9 34 U1 0 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD NOV 25 PY 1991 VL 318 IS 1-2 BP 327 EP 333 DI 10.1016/0022-0728(91)85314-F PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA HE120 UT WOS:A1991HE12000025 ER PT J AU COGAN, KA GAST, AP CAPEL, M AF COGAN, KA GAST, AP CAPEL, M TI STRETCHING AND SCALING IN POLYMERIC MICELLES SO MACROMOLECULES LA English DT Article ID ANGLE NEUTRON-SCATTERING; STAR POLYMERS; BLOCK COPOLYMERS; LIGHT-SCATTERING; X-RAY; THERMODYNAMIC PROPERTIES; GOOD SOLVENTS; POLYSTYRENE; GYRATION; WATER AB We probe the details of block copolymer micelle structure with small-angle X-ray and neutron scattering. Working with polystyrene/poly(ethylene oxide) diblock copolymers in cyclopentane and deuterated cyclohexane, we can control micelle aggregation numbers by adding trace amounts of water1,2 and can therefore modulate the deformation of the polystyrene blocks in the micelle coronae. We compare our measurements with predictions of a starlike model that assumes semidilute conditions throughout the micelle corona. Scaling behavior consistent with the model is observed for micelles with large polystyrene blocks at THETA-conditions. The signature scattering of a random coil in the intermediate scattering region begins at a larger scattering vector for the polystyrene blocks constrained to the micelle coronae compared to that for an unperturbed coil. The semidilute solution in the micelle coronae is characterized by a z-average blob size that decreases with increasing aggregation number. Scattering in the intermediate region from micelles of smaller, more symmetric copolymer indicates the polystyrene blocks are stretched so severely that they do not undergo a random walk on any length scale. These results illustrate the strong interplay between copolymer composition and micelle structure. C1 STANFORD UNIV,DEPT CHEM ENGN,STANFORD,CA 94305. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 48 TC 59 Z9 59 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 25 PY 1991 VL 24 IS 24 BP 6512 EP 6520 DI 10.1021/ma00024a023 PG 9 WC Polymer Science SC Polymer Science GA GR752 UT WOS:A1991GR75200023 ER PT J AU AKEI, M AMANN, JF CHIBA, J EJIRI, H ISEKI, Y FUKUDA, M FUKUDA, T HASHIMOTO, O HIGASHI, A HOMMA, S IRIE, T KASHITANI, A KATO, S KIMURA, K KISHIMOTO, T MAEDA, K MATSUYAMA, Y MCGILL, JA NAGAE, T NAGASAWA, H NAGOSHI, C NOUMI, H NOMACHI, M OHSUMI, H OKUDA, K OMATA, K SANO, H SASAKI, O SHIBATA, T SOGA, F TAKEUCHI, F THIESSEN, HA TOYAMA, S TANAKA, KH UMEDA, Y YOSHIKAWA, N YAMANOI, Y AF AKEI, M AMANN, JF CHIBA, J EJIRI, H ISEKI, Y FUKUDA, M FUKUDA, T HASHIMOTO, O HIGASHI, A HOMMA, S IRIE, T KASHITANI, A KATO, S KIMURA, K KISHIMOTO, T MAEDA, K MATSUYAMA, Y MCGILL, JA NAGAE, T NAGASAWA, H NAGOSHI, C NOUMI, H NOMACHI, M OHSUMI, H OKUDA, K OMATA, K SANO, H SASAKI, O SHIBATA, T SOGA, F TAKEUCHI, F THIESSEN, HA TOYAMA, S TANAKA, KH UMEDA, Y YOSHIKAWA, N YAMANOI, Y TI THE (PI+,K+) REACTION ON C-12 AND FE-56 SO NUCLEAR PHYSICS A LA English DT Article ID HYPERNUCLEI; POLARIZATION AB The kaon momentum spectra were measured in the (pi+,K+) reaction on a carbon and an iron target at the KEK 12 GeV proton synchrotron by using of a broad-range medium-resolution spectrometer. The obtained spectra in the hypernuclear bound region were compared with a DWIA calculation and those in the quasifree region with a Fermi gas model. It has been shown that these calculations give a good account of the general characteristics of the (pi+,K+) reaction. C1 KYOTO SANGYO UNIV,KYOTO 603,JAPAN. KYUSHU UNIV,DEPT PHYS,FUKUOKA 812,JAPAN. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. UNIV CALIF LOS ALAMOS SCI LAB,LAMPF,LOS ALAMOS,NM 87545. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. TOHOKU UNIV,COLL GEN EDUC,SENDAI,MIYAGI 980,JAPAN. UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. YAMAGATA UNIV,FAC EDUC,YAMAGATA 990,JAPAN. NR 22 TC 34 Z9 35 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 NOV 25 PY 1991 VL 534 IS 3-4 BP 478 EP 492 PG 15 WC Physics, Nuclear SC Physics GA GT149 UT WOS:A1991GT14900002 ER PT J AU DOWKER, HF LAFLAMME, R AF DOWKER, HF LAFLAMME, R TI WORMHOLES AND GRAVITONS SO NUCLEAR PHYSICS B LA English DT Article ID QUANTUM-GRAVITY; PERTURBATIONS; UNIVERSE AB We investigate the effect of wormholes on gravitons. We obtain the two-point function for gravitons in asymptotically flat space in the presence of a wormhole. We show that this result can be reproduced in the theory of gravitons in flat space by the first-order contribution to the propagator due to an effective interaction of the form C(mu-nu-rho-sigma)C(mu-nu-rho-sigma). In the linear approximation to pure gravity there are no wormhole-induced corrections to the cosmological constant or to Newton's constant. C1 UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,CAMBRIDGE CB3 9EW,ENGLAND. RP DOWKER, HF (reprint author), FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 31 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD NOV 25 PY 1991 VL 366 IS 1 BP 209 EP 232 DI 10.1016/0550-3213(91)90057-5 PG 24 WC Physics, Particles & Fields SC Physics GA GQ162 UT WOS:A1991GQ16200008 ER PT J AU HARRIS, LC POTTER, PM TANO, K SHIOTA, S MITRA, S BRENT, TP AF HARRIS, LC POTTER, PM TANO, K SHIOTA, S MITRA, S BRENT, TP TI CHARACTERIZATION OF THE PROMOTER REGION OF THE HUMAN O6-METHYLGUANINE-DNA METHYLTRANSFERASE GENE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID O-6-METHYLGUANINE-DNA METHYLTRANSFERASE; ESCHERICHIA-COLI; HUMAN-TUMOR; TRANSCRIPTION FACTOR; MAMMALIAN-CELLS; ALKYLATED DNA; EXPRESSION; SEQUENCE; PROTEIN; REPAIR AB O6-methylguanine-DNA methyltransferase (MGMT)is a ubiquitous protein responsible for repair of O6-alkylguanine, a mutagenic, carcinogenic and toxic lesion. To characterize the elements responsible for the regulation of the MGMT gene, a 2.6 kb Sstl fragment isolated from a genomic clone, was shown to contain 5' flanking sequences of the gene. The promoter activity of this fragment as well as various subfragments were tested in NIH 3T3 mouse fibroblasts by transient expression of the bacterial chloramphenicol acetyltransferase (CAT) gene linked to these fragments. Maximal promoter activity was observed in a 1.2 kb 3' terminal fragment, which contains the first untranslated exon. The transcription initiation site was identified in this fragment by primer extension and S1 mapping. Sequence analysis of this fragment showed the absence of TATA and CAAT boxes but an abundance of extremely GC-rich sequences, including ten GC hexanucleotide motifs 5'CCGCCC. Reduced CAT expression with the minimal promoter sequence suggests the presence of multiple regulatory elements. C1 ST JUDE CHILDRENS RES HOSP, DEPT BIOCHEM & CLIN PHARMACOL, MEMPHIS, TN 38101 USA. UNIV TENNESSEE, CTR HLTH SCI, COLL MED, DEPT PHARMACOL, MEMPHIS, TN 38163 USA. OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, CTR HLTH SCI, COLL MED, GRAD SCH BIOMED SCI, MEMPHIS, TN 38163 USA. RI Potter, Philip/J-4515-2013 FU NCI NIH HHS [CA21765, CA14799, CA36888] NR 41 TC 125 Z9 129 U1 0 U2 2 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 NOV 25 PY 1991 VL 19 IS 22 BP 6163 EP 6167 DI 10.1093/nar/19.22.6163 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GR785 UT WOS:A1991GR78500013 PM 1956775 ER PT J AU FURTH, PA HENNIGHAUSEN, L BAKER, C BEATTY, B WOYCHICK, R AF FURTH, PA HENNIGHAUSEN, L BAKER, C BEATTY, B WOYCHICK, R TI THE VARIABILITY IN ACTIVITY OF THE UNIVERSALLY EXPRESSED HUMAN CYTOMEGALOVIRUS IMMEDIATE EARLY GENE-1 ENHANCER PROMOTER IN TRANSGENIC MICE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID AMP-RESPONSE ELEMENTS; TRANSCRIPTION FACTORS; REGULATORY REGION; VIRUS ENHANCER; SEQUENCE; CELLS; MUSCLE AB Transcriptional control regions which direct transgene expression to all tissues in transgenic animals can be useful tools for gain-of-function experiments in transgenic animals. A candidate for this purpose is the regulatory region of the human cytomegalovirus immediate early 1 gene (HCMVIE1) which is highly expressed in many lines of tissue culture cells. Here we analyzed the activity of the HCMVIE1 enhancer/promoter using a sensitive reporter gene, the bacterial chloramphenicol acetyltransferase (CAT) gene. Three lines of transgenic mice with an intact transgene were established. All 3 lines expressed the transgene in all 28 tissues analyzed; however, levels of expression between the three lines varied up to 100,000 fold. In addition, expression levels in the high expressing line varied over a 10,000 fold continuum, while expression levels between tissues was almost uniform in the lowest expressing line. The transgene was well expressed in the high expressing line; CAT activity in the highest expressing tissues was equivalent to levels previously reported for tissue specific CAT transgenes active only in a limited number of tissues. These data support the utilization of the HCMVIE1 enhancer/promoter as a means of expressing a transgene in all tissues, but indicate that lines with substantially different overall levels of expression may be generated, and that markedly different levels of tissue specific expression may be found when the overall level of transgene expression is high. C1 NIDDK,BIOCHEM & METAB LAB,BETHESDA,MD 20892. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP FURTH, PA (reprint author), NCI,TUMOR VIRUS BIOL LAB,BETHESDA,MD 20892, USA. RI Tang, Amy/L-3226-2016 OI Tang, Amy/0000-0002-5772-2878 NR 27 TC 100 Z9 100 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 NOV 25 PY 1991 VL 19 IS 22 BP 6205 EP 6208 DI 10.1093/nar/19.22.6205 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GR785 UT WOS:A1991GR78500019 PM 1956779 ER PT J AU FAN, JB GROTHUES, D SMITH, CL AF FAN, JB GROTHUES, D SMITH, CL TI ALIGNMENT OF SFI-I SITES WITH THE NOT-I RESTRICTION MAP OF SCHIZOSACCHAROMYCES-POMBE GENOME SO NUCLEIC ACIDS RESEARCH LA English DT Article ID FIELD GEL-ELECTROPHORESIS; YEAST CHROMOSOME; S-POMBE; SEPARATION; CONSTRUCTION; INTEGRATION; REPEAT; TYPE-1; DNA AB A Sfi I restriction map of the fission yeast Schizosaccharomyces pombe genome was aligned with the Not I restriction map. There are 16 Sfi I sites in the S. pombe genome. Three Sfi I sites are on chromosome III which is devoid of Not I sites. The sizes of the entire genome and individual chromosomes, calculated from the Sfi I fragment sizes, are consistent with that calculated from the Not I fragment sizes. The Sfi I map provides greater physical characterization of the S. pombe genome and further validates the use of S. pombe chromosomal DNA as size standard. These maps have allowed detection of polymorphism on all three chromosomes. C1 UNIV CALIF BERKELEY, DEPT MOLEC & CELL BIOL, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV CHEM BIODYNAM, BERKELEY, CA 94720 USA. RP COLUMBIA UNIV, DEPT GENET & DEV, NEW YORK, NY 10032 USA. OI Smith, Cassandra/0000-0002-0346-8907 FU NCI NIH HHS [CA 39782] NR 24 TC 23 Z9 24 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 NOV 25 PY 1991 VL 19 IS 22 BP 6289 EP 6294 DI 10.1093/nar/19.22.6289 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GR785 UT WOS:A1991GR78500032 PM 1956788 ER PT J AU ZUMBERGE, MA HILDEBRAND, JA STEVENSON, JM PARKER, RL CHAVE, AD ANDER, ME SPIESS, FN AF ZUMBERGE, MA HILDEBRAND, JA STEVENSON, JM PARKER, RL CHAVE, AD ANDER, ME SPIESS, FN TI SUBMARINE MEASUREMENT OF THE NEWTONIAN GRAVITATIONAL CONSTANT SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOWER GRAVITY EXPERIMENT; INVERSE-SQUARE LAW AB We have measured the Newtonian gravitational constant using the ocean as an attracting mass and a research submersible as a platform for gravity measurements. Gravitational acceleration was measured along four continuous profiles to depths of 5000 m with a resolution of 0.1 mGal. These data, combined with satellite altimetry, sea surface and seafloor gravity measurements, and seafloor bathymetry, yield an estimate of G = (6.677 +/- 0.013) x 10(-11) m3 s-2 kg-1; the fractional uncertainty is 2 parts in 1000. Within this accuracy, the submarine value for G is consistent with laboratory determinations. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP ZUMBERGE, MA (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093, USA. NR 24 TC 29 Z9 30 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3051 EP 3054 DI 10.1103/PhysRevLett.67.3051 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000002 ER PT J AU SUITS, AG DEPUJO, P SUBLEMONTIER, O VISTICOT, JP BERLANDE, J CUVELLIER, J GUSTAVSSON, T MESTDAGH, JM MEYNADIER, P LEE, YT AF SUITS, AG DEPUJO, P SUBLEMONTIER, O VISTICOT, JP BERLANDE, J CUVELLIER, J GUSTAVSSON, T MESTDAGH, JM MEYNADIER, P LEE, YT TI DYNAMICS OF ELECTRONICALLY INELASTIC-COLLISIONS FROM 3D DOPPLER MEASUREMENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY-DEPENDENCE; SPECTROSCOPY; DISSOCIATION; MOLECULES; VELOCITY; KINETICS AB Flux-velocity contour maps were obtained for the inelastic collision process Ba(1P1) + O2, N2 --> Ba(3P2) + O2, N2 from Doppler scans of scattered Ba(3P2) taken over a range of probe-laser directions in a crossed-beam experiment. The distributions suggest the importance of large-impact-parameter collisions and near-resonant energy transfer in the case Of O2, while for N2 close collisions dominate despite the presence of an analogous near-resonant channel. The results represent the first direct experimental demonstration of a near-resonant quenching process. C1 CENS,SPAM,DRECAM,F-91191 GIF SUR YVETTE,FRANCE. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Gustavsson, Thomas/B-1702-2009; Lee, Yuan-Tseh/F-7914-2012; Visticot, Jean-Paul/D-4058-2009 OI Gustavsson, Thomas/0000-0001-7030-6812; Visticot, Jean-Paul/0000-0003-1055-4827 NR 21 TC 10 Z9 10 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3070 EP 3073 DI 10.1103/PhysRevLett.67.3070 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000007 ER PT J AU DESJARLAIS, MP POINTON, TD SEIDEL, DB COATS, RS KIEFER, ML QUINTENZ, JP SLUTZ, SA AF DESJARLAIS, MP POINTON, TD SEIDEL, DB COATS, RS KIEFER, ML QUINTENZ, JP SLUTZ, SA TI EVOLUTION AND CONTROL OF ION-BEAM DIVERGENCE IN APPLIED-B DIODES SO PHYSICAL REVIEW LETTERS LA English DT Article ID INERTIAL CONFINEMENT FUSION; STABILITY; DYNAMICS AB The time evolution of beam divergence induced by electromagnetic instabilities in applied-B ion diodes is examined using the 3D particle-in-cell code QUICKSILVER. The evolution is generally characterized by a high-frequency, low-divergence phase, associated with the diocotron mode, followed by a low-frequency, high-divergence phase, associated with the two-stream-like ion mode. Limiting the extent of the electron density profile evolution allows the diocotron phase to be sustained with a resulting divergence of approximately 10 mrad. RP DESJARLAIS, MP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 20 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3094 EP 3097 DI 10.1103/PhysRevLett.67.3094 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000013 ER PT J AU JACKSON, GL WINTER, J TAYLOR, TS BURRELL, KH DEBOO, JC GREENFIELD, CM GROEBNER, RJ HODAPP, T HOLTROP, K LAZARUS, EA LAO, LL LIPPMANN, SI OSBORNE, TH PETRIE, TW PHILLIPS, J JAMES, R SCHISSEL, DP STRAIT, EJ TURNBULL, AD WEST, WP AF JACKSON, GL WINTER, J TAYLOR, TS BURRELL, KH DEBOO, JC GREENFIELD, CM GROEBNER, RJ HODAPP, T HOLTROP, K LAZARUS, EA LAO, LL LIPPMANN, SI OSBORNE, TH PETRIE, TW PHILLIPS, J JAMES, R SCHISSEL, DP STRAIT, EJ TURNBULL, AD WEST, WP TI REGIME OF VERY HIGH CONFINEMENT IN THE BORONIZED DIII-D TOKAMAK SO PHYSICAL REVIEW LETTERS LA English DT Article ID H-MODE TRANSITION AB Following boronization, tokamak discharges in DIII-D have been obtained with confinement times up to a factor of 3.5 above the ITER89-P L-mode scaling and 1.8 times greater than the DIII-D/JET H-mode scaling relation. Very high confinement phases are characterized by relatively high central density with n(e) (0) almost-equal-to 1 x 10(20) m-3 , and central ion temperatures up to 13.6 keV at moderate plasma currents (1.6 MA) and heating powers (12.5-15.3 MW). These discharges exhibit a low fraction of radiated power, P less-than-or-equal-to 25%, Z(eff)(0) close to unity, and lower impurity influxes than comparable DIII-D discharges before boronization. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. EURATOM,KFA JULICH,FORSCHUNGSZENTRUM JULICH,JULICH,GERMANY. RP JACKSON, GL (reprint author), GEN ATOM CO,SAN DIEGO,CA 92128, USA. NR 13 TC 181 Z9 182 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 NOV 25 PY 1991 VL 67 IS 22 BP 3098 EP 3101 DI 10.1103/PhysRevLett.67.3098 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000014 ER PT J AU GIBBS, D GRUBEL, G ZEHNER, DM ABERNATHY, DL MOCHRIE, SGJ AF GIBBS, D GRUBEL, G ZEHNER, DM ABERNATHY, DL MOCHRIE, SGJ TI ORIENTATIONAL EPITAXY OF THE HEXAGONALLY RECONSTRUCTED PT(001) SURFACE SO PHYSICAL REVIEW LETTERS LA English DT Article ID REGISTERED PHASE-TRANSITION; X-RAY; AU(001) SURFACE; MONOLAYERS; GRAPHITE; DIFFRACTION; PT(100); ARGON; XENON; LEED AB We describe x-ray-scattering studies of the orientational epitaxy displayed by the hexagonally reconstructed Pt(001) surface. At 1685 K, the reconstructed surface layer undergoes a continuous rotational transformation with respect to the underlying bulk and exhibits mean-field behavior. A second, discontinuous rotational transformation is observed at 1580 K. These results are inconsistent with the predictions of current theories and lead us to propose a mean-field description of rotational transformations. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP GIBBS, D (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Abernathy, Douglas/A-3038-2012 OI Abernathy, Douglas/0000-0002-3533-003X NR 24 TC 35 Z9 35 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3117 EP 3120 DI 10.1103/PhysRevLett.67.3117 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000019 ER PT J AU PHILLIPS, R DENG, H CARLSSON, AE DAW, MS AF PHILLIPS, R DENG, H CARLSSON, AE DAW, MS TI TOTAL ENERGIES OF IMPROVED QUASI-CRYSTAL MODELS SO PHYSICAL REVIEW LETTERS LA English DT Article AB The first electronic total-energy calculations are performed on a 6D-3D projection model for the TiMn quasicrystal, as well as two refined models obtained by filling vacant spaces. The total energies correlate almost perfectly with the reduction of the vacant space, and suggest that future modeling efforts should concentrate on increasing the coordination number of Ti sites in the "glue" regions between the large icosahedral clusters which form the backbone of the structure. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. WASHINGTON UNIV,ST LOUIS,MO 63130. NR 20 TC 13 Z9 13 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3128 EP 3131 DI 10.1103/PhysRevLett.67.3128 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000022 ER PT J AU SAMARA, GA SCHIRBER, JE MOROSIN, B HANSEN, LV LOY, D SYLWESTER, AP AF SAMARA, GA SCHIRBER, JE MOROSIN, B HANSEN, LV LOY, D SYLWESTER, AP TI PRESSURE-DEPENDENCE OF THE ORIENTATIONAL ORDERING IN SOLID C60 SO PHYSICAL REVIEW LETTERS LA English DT Article ID C-60 AB Pressure studies of the molecular orientational ordering in solid C60 have exhibited three principal effects: (1) The simple-cubic (sc) to face-centered-cubic (fcc) ordering transition temperature (T(c) = 249 K) increases with pressure at a rate of 10.4 +/- 0.2 K/kbar corresponding to dlnT(c)/dlna0 = -22.8, where a0 is the lattice parameter; (2) pressure greatly reduces orientational fluctuations of the C60 molecules in the ordered low-temperature sc phase; and (3) the results suggest the presence of two ordering transitions instead of one near 249 K. The implications of these results are discussed. RP SAMARA, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 14 TC 165 Z9 167 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 NOV 25 PY 1991 VL 67 IS 22 BP 3136 EP 3139 DI 10.1103/PhysRevLett.67.3136 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000024 ER PT J AU WELP, U FLESHLER, S KWOK, WK KLEMM, RA VINOKUR, VM DOWNEY, J VEAL, B CRABTREE, GW AF WELP, U FLESHLER, S KWOK, WK KLEMM, RA VINOKUR, VM DOWNEY, J VEAL, B CRABTREE, GW TI HIGH-FIELD SCALING BEHAVIOR OF THERMODYNAMIC AND TRANSPORT QUANTITIES OF YBA2CU3O7-DELTA NEAR THE SUPERCONDUCTING TRANSITION SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; MAGNETIC-FIELD; CRITICAL FLUCTUATIONS; SINGLE-CRYSTAL; INPLANE PARACONDUCTIVITY; HEAT; DIMENSIONALITY AB The superconducting contribution to the magnetization and resistivity of twinned and untwinned YBa2Cu3O7-delta crystals which are presented here, as well as to the specific heat (Inderhees et al.) and Ettinghausen coefficient (Palstra et al.), displays scaling behavior in the variable [T-T(c)(H)]/(TH)2/3. This is consistent with Ginzburg-Landau fluctuation theory for a 3D system in a high magnetic field. The scaling property allows for a consistent way of determining the mean-field transition temperature T(c)(H). RP WELP, U (reprint author), ARGONNE NATL LAB,DIV MAT SCI,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. NR 39 TC 236 Z9 236 U1 2 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3180 EP 3183 DI 10.1103/PhysRevLett.67.3180 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000035 ER PT J AU KOTHE, G WEBER, S BITTL, R OHMES, E THURNAUER, MC NORRIS, JR AF KOTHE, G WEBER, S BITTL, R OHMES, E THURNAUER, MC NORRIS, JR TI TRANSIENT EPR OF LIGHT-INDUCED RADICAL PAIRS IN PLANT PHOTOSYSTEM-I - OBSERVATION OF QUANTUM BEATS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-SPIN POLARIZATION; PARAMAGNETIC RESONANCE; PHOTOSYNTHETIC ALGAE; REACTION CENTERS; TRIPLET-STATES; SPECTROSCOPY; DYNAMICS; SPECTRA; SIGNALS AB Electron spin polarization of light-induced radical pairs in plant photosystem I is studied by transient EPR following pulsed laser excitation. The time evolution of the transverse magnetization is monitored at various static and microwave magnetic fields. Quantum beat oscillations are observed at early times after light excitation of fully deuterated whole algae Synechococcus lividus. Model calculations for the time profiles, based on the correlated radical pair mechanism, provide information on the spin-spin coupling and lifetime of the secondary radical pair. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP KOTHE, G (reprint author), UNIV STUTTGART,INST PHYS CHEM,PFAFFENWALDRING 55,W-7000 STUTTGART 80,GERMANY. RI Weber, Stefan/G-6164-2010; Bittl, Robert/I-8149-2013 NR 31 TC 79 Z9 83 U1 2 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 NOV 22 PY 1991 VL 186 IS 6 BP 474 EP 480 DI 10.1016/0009-2614(91)90454-H PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GT082 UT WOS:A1991GT08200002 ER PT J AU SILKS, LA PENG, J ODOM, JD DUNLAP, RB AF SILKS, LA PENG, J ODOM, JD DUNLAP, RB TI AN IMPROVED SYNTHESIS OF CHIRAL OXAZOLIDINE-2-SELONES - HIGHLY SENSITIVE SE-77 NMR REAGENTS FOR THE DETECTION AND QUANTITATION OF CHIRALITY SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Letter ID NUCLEAR-MAGNETIC-RESONANCE; SELENIUM DOUBLE-BONDS; ORGANOSELENIUM COMPOUNDS; ALPHA-CHYMOTRYPSIN; P-31 NMR; SPECTROSCOPY; ALCOHOLS; AMINES; C=SE AB The synthesis of the title compounds from readily available oxazolines has been accomplished in one step in high yield. These chiral reagents exhibit extraordinary Se-77 chemical shift sensitivity and are useful for the detection and quantitation of chirality at remotely disposed chiral centers. RP SILKS, LA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,BIOCHEM SECT,INC 4 MSC 346,LOS ALAMOS,NM 87545, USA. NR 47 TC 44 Z9 44 U1 0 U2 0 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 NOV 22 PY 1991 VL 56 IS 24 BP 6733 EP 6736 DI 10.1021/jo00024a003 PG 4 WC Chemistry, Organic SC Chemistry GA GR428 UT WOS:A1991GR42800003 ER PT J AU HUANG, CS ZHANG, DH AF HUANG, CS ZHANG, DH TI WARD IDENTITIES AND CHARACTERS OF KAC-MOODY ALGEBRAS SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID CONFORMAL FIELD-THEORY; RIEMANN SURFACE; STRING THEORY; 2 DIMENSIONS; LIE-ALGEBRAS; INVARIANCE; VIRASORO; MODELS AB We derive partial differential equations for characters of Kac-Moody algebras by using Wards identities for energy-momentum tensors and currents on a torus and the null vectors of current algebras. The solutions of the partial differential equations for affine algebras A(l)(1), D(l)(1), E(l)(1) (l = 6, 7, 8) and B(l)(1), at level one, are given. C1 CHINESE CTR ADV SCI & TECHNOL,CTR THEORET PHYS,BEIJING,PEOPLES R CHINA. CHINESE ACAD SCI,DEPT PHYS,BEIJING,PEOPLES R CHINA. RP HUANG, CS (reprint author), FERMI NATL ACCELERATOR LAB,DEPT THEORET PHYS,POB 500,BATAVIA,IL 60510, USA. NR 24 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD NOV 21 PY 1991 VL 24 IS 22 BP 5215 EP 5226 DI 10.1088/0305-4470/24/22/005 PG 12 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA GT196 UT WOS:A1991GT19600005 ER PT J AU PRODEHL, C MECHIE, J KAMINSKI, W FUCHS, K GROSSE, C HOFFMANN, H STANGL, R STELLRECHT, R KHAN, MA MAGUIRE, PKH KIRK, W KELLER, GR GITHUI, A BAKER, M MOONEY, W CRILEY, E LUETGERT, J JACOB, B THYBO, H DEMARTIN, M SCARASCIA, S HIRN, A BOWMAN, JR NYAMBOK, I GACIRI, S PATEL, J DINDI, E GRIFFITHS, DH KING, RF MUSSETT, AE BRAILE, LW THOMPSON, G OLSEN, K HARDER, S VEES, R GAJEWSKI, D SCHULTE, A OBEL, J MWANGO, F MUKINYA, J RIAROH, D AF PRODEHL, C MECHIE, J KAMINSKI, W FUCHS, K GROSSE, C HOFFMANN, H STANGL, R STELLRECHT, R KHAN, MA MAGUIRE, PKH KIRK, W KELLER, GR GITHUI, A BAKER, M MOONEY, W CRILEY, E LUETGERT, J JACOB, B THYBO, H DEMARTIN, M SCARASCIA, S HIRN, A BOWMAN, JR NYAMBOK, I GACIRI, S PATEL, J DINDI, E GRIFFITHS, DH KING, RF MUSSETT, AE BRAILE, LW THOMPSON, G OLSEN, K HARDER, S VEES, R GAJEWSKI, D SCHULTE, A OBEL, J MWANGO, F MUKINYA, J RIAROH, D TI LARGE-SCALE VARIATION IN LITHOSPHERIC STRUCTURE ALONG AND ACROSS THE KENYA RIFT SO NATURE LA English DT Article ID GREGORY RIFT; VALLEY AB THE Kenya rift is one of the classic examples of a continental rift zone: models for its evolution range from extension of the lithosphere by pure shear 1, through extension by simple shear 2, to diapiric upwelling of an asthenolith 3. Following a pilot study in 1985 4, the present work involved the shooting of three seismic refraction and wide-angle reflection profiles along the axis, across the margins, and on the northeastern flank of the rift (Fig. 1). These lines were intended to reconcile the different crustal thickness estimates for the northern and southern parts of the rift 4-6 and to reveal the structure across the rift, including that beneath the Hanks. The data, presented here, reveal significant lateral variations in structure both along and across the rift. The crust thins along the rift axis from 35 km in the south to 20 km in the north; there are abrupt changes in Moho depth and uppermost-mantle seismic velocity across the rift margins, and crustal thickening across the boundary between the Archaean craton and Pan-African orogenic belt immediately west of the rift. These results suggest that thickened crust may have controlled the rift's location, that there is a decrease in extension from north to south, and that the upper mantle immediately beneath the rift may contain reservoirs of magma generated at greater depth. C1 UNIV LEICESTER,DEPT GEOG,LEICESTER LE1 7RH,ENGLAND. UNIV TEXAS,DEPT GEOL SCI,EL PASO,TX 79968. US GEOL SURVEY,MENLO PK,CA 94025. UNIV COPENHAGEN,INST ALMEN GEOL,COPENHAGEN,DENMARK. CNR,IST GEOFIS LITOSFERA,I-20133 MILAN,ITALY. INST PHYS GLOBE,PARIS,FRANCE. AUSTRALIAN NATL UNIV,SCH EARTH SCI,CANBERRA,ACT 2600,AUSTRALIA. UNIV NAIROBI,NAIROBI,KENYA. UNIV BIRMINGHAM,DEPT GEOL SCI,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. UNIV LIVERPOOL,DEPT GEOL SCI,LIVERPOOL L69 3BX,ENGLAND. PURDUE UNIV,DEPT EARTH & ATMOSPHERE SCI,W LAFAYETTE,IN 47907. STANFORD UNIV,MENLO PK,CA 94025. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV CLAUSTHAL,INST GEOPHYS,CLAUSTHAL ZELLERFE,GERMANY. SURVEY KENYA,NAIROBI,KENYA. MINIST WATER RESOURCES & DEV,NAIROBI,KENYA. DEPT FISHERIES,NAIROBI,KENYA. MINIST ENERGY,NAIROBI,KENYA. RP PRODEHL, C (reprint author), UNIV KARLSRUHE,INST GEOPHYS,W-7500 KARLSRUHE,GERMANY. RI Gajewski, Dirk/C-1077-2011; Thybo, Hans/B-9292-2008; OI Thybo, Hans/0000-0002-3945-8065; Grosse, Christian/0000-0002-7956-0558 NR 19 TC 38 Z9 38 U1 3 U2 16 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 21 PY 1991 VL 354 IS 6350 BP 223 EP 227 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GQ948 UT WOS:A1991GQ94800047 ER PT J AU GRANT, ER WHITE, MG AF GRANT, ER WHITE, MG TI ZEKE THRESHOLD PHOTOELECTRON-SPECTROSCOPY SO NATURE LA English DT Article ID PHOTOIONIZATION C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP GRANT, ER (reprint author), PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907, USA. NR 11 TC 44 Z9 44 U1 0 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD NOV 21 PY 1991 VL 354 IS 6350 BP 249 EP 250 DI 10.1038/354249a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GQ948 UT WOS:A1991GQ94800055 ER PT J AU JIN, D SAVAGE, MJ JUN, L SPRINGER, R AF JIN, D SAVAGE, MJ JUN, L SPRINGER, R TI LOW-ENERGY EFFECTIVE HAMILTONIAN FOR DELTA-I=1 NUCLEAR PARITY VIOLATION AND NUCLEONIC STRANGENESS SO PHYSICS LETTERS B LA English DT Article ID PROTON-SCATTERING; NON-CONSERVATION; NE-21; NONCONSERVATION; DECAYS; F-18; Z0 AB We calculate the low energy effective hamiltonian for isovector (DELTA-I = 1) nuclear parity violation, including the effects of heavy quarks s, c, and b. At the hadronic scale, the hamiltonian contains four-quark operators of the u, d, and s quarks whose coefficients contain leading logarithmic QCD corrections from running between the weak scale and the hadronic scale. The coefficients of the operators involving the s quark are substantially larger than those of the operators involving only the u and d quarks. Recent EMC measurements of the spin-dependent proton structure function g1p(x) and measurements of the low-Q2 axial nucleon-Z0 coupling from neutrino scattering indicate that the nucleon matrix element of the strange axial vector current is substantial. Assuming that the weak amplitude factorizes, this matrix element gives rise to an enhancement in the weak isovector parity violating NN-rho coupling, and consequently an enhancement of h(rho)1. C1 UNIV CALIF SAN DIEGO,DEPT THEORET PHYS,LA JOLLA,CA 92093. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. RP JIN, D (reprint author), RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08855, USA. NR 33 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 21 PY 1991 VL 271 IS 3-4 BP 403 EP 409 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GV616 UT WOS:A1991GV61600022 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 GRODZINS, L GUSHUE, S HAMAGAKI, H HANSEN, O HAYANO, R HAYASHI, S HOMMA, S HUANG, HZ IKEDA, Y JURICIC, I KANG, J 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 ROEHRICH, D 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 VOSSNACK, O VULGARIS, E VUTSADAKIS, V WATSON, WA WEGNER, HE WOODRUFF, DS WU, YD ZAJC, WA 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 GRODZINS, L GUSHUE, S HAMAGAKI, H HANSEN, O HAYANO, R HAYASHI, S HOMMA, S HUANG, HZ IKEDA, Y JURICIC, I KANG, J 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 ROEHRICH, D 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 VOSSNACK, O VULGARIS, E VUTSADAKIS, V WATSON, WA WEGNER, HE WOODRUFF, DS WU, YD ZAJC, WA TI ANTIPROTON PRODUCTION IN 14.6 A GEV/C SI+A COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; NUCLEAR COLLISIONS AB Antiproton production cross sections have been measured for minimum bias and central Si + Al and Si + Au collisions at 14.6 A GeV/c. The data presented cover the range of transverse momentum from 0.3 to 1.2 GeV/c and lab rapidities from 1.1 to 1.7 units. The relative pBAR/pi- and pBAR/K- yields are found to be the smallest for the heaviest system measured, central Si + Au collisions. For these collisions, the pBAR/pi- ratio, determined from integrated yields for 1.1 less-than-or-equal-to y less-than-or-equal-to 1.7, is (0.84 +/- 0.07) 10(-3). In the same rapidity interval, the average antiproton inverse m perpendicular-to slope is 141 +/- 14 MeV for central Si + Al and central Si + Au collisions. C1 UNIV CALIF,RIVERSIDE,CA 92507. UNIV TOKYO,DEPT PHYS,TOKYO 133,JAPAN. NEVIS LABS,IRVINGTON,NY 10533. UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. BROOKHAVEN NATL LAB,DEPT AGS,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. MIT,CAMBRIDGE,MA 02139. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. COLUMBIA UNIV,NEW YORK,NY 10027. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. KYUSHU UNIV,FUKUOKA 812,JAPAN. HIROSHIMA UNIV,DEPT PHYS,HIROSHIMA 730,JAPAN. RI Cumming, James/I-3358-2013; SAKURAI, HIROYOSHI/G-5085-2014; Hayano, Ryugo/F-7889-2012; HAMAGAKI, HIDEKI/G-4899-2014; OI Cumming, James/0000-0001-6930-0958; Hayano, Ryugo/0000-0002-1214-7806; Tannenbaum, Michael/0000-0002-8840-5314 NR 25 TC 25 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 21 PY 1991 VL 271 IS 3-4 BP 447 EP 452 DI 10.1016/0370-2693(91)90116-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GV616 UT WOS:A1991GV61600030 ER PT J AU ADEVA, B ADRIANI, O AGUILARBENITEZ, M AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BRUYANT, F BUISSON, C BUJAK, A BUJAK, A BURGER, JD BURGER, W BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CIVININI, C CLARE, I CLARE, R COHN, HO COIGNET, G COLINO, N COMMICHAU, V CONTIN, A CRIJNS, F CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, Q FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GLAUBMAN, M GOLDFARB, S GONG, ZF GONZALEZ, E GORDEEV, A GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GUANZIROLI, M GUO, JK GURTU, A GUSTAFSON, HR GUTAY, LJ HAAN, H HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HSU, LS HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KARYOTAKIS, Y KAUR, M KHOKHAR, S KHOZE, V KIENZLEFOCACCI, MN KINNISON, W KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KORNADT, O KOUTSENKO, V KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIZMANIC, J KUMAR, KS KUMAR, V KUNIN, A LALIEU, V LANDI, G LANIUS, K LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, D LEEDOM, I LEGOFF, JM LEISTAM, L LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEVCHENKO, PM LEYTENS, X LI, C LI, HT LI, JF LI, L LI, PJ LI, Q LI, XG LIAO, JY LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, R LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MAGAHIZ, R MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, G MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H PANDOULAS, D PAULUZZI, M PAUSS, F PLASIL, F PASSALEVA, G PAOLETTI, S PATRICELLI, S PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z REUCROFT, S RICKER, A RIEMANN, S RIND, O RIPPICH, C RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, G SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SAVIN, A SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHMAKOV, K SHOUTKO, V SHUMILOV, E SMIRNOV, N SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STOEFFL, W STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TARKOVSKY, E TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONG, YP TONUTTI, M TONWAR, SC TOTH, J TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, Z WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SL WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A AF ADEVA, B ADRIANI, O AGUILARBENITEZ, M AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BRUYANT, F BUISSON, C BUJAK, A BUJAK, A BURGER, JD BURGER, W BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CIVININI, C CLARE, I CLARE, R COHN, HO COIGNET, G COLINO, N COMMICHAU, V CONTIN, A CRIJNS, F CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, Q FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M 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LINDEMANN, B LINNHOFER, D LIU, R LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MAGAHIZ, R MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, G MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H PANDOULAS, D PAULUZZI, M PAUSS, F PLASIL, F PASSALEVA, G PAOLETTI, S PATRICELLI, S PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z REUCROFT, S RICKER, A RIEMANN, S RIND, O RIPPICH, C RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, G SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SAVIN, A SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHMAKOV, K SHOUTKO, V SHUMILOV, E SMIRNOV, N SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STOEFFL, W STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TARKOVSKY, E TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONG, YP TONUTTI, M TONWAR, SC TOTH, J TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, Z WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SL WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A TI SEARCH FOR LEPTON FLAVOR VIOLATION IN Z(0) DECAYS SO PHYSICS LETTERS B LA English DT Article ID HIGH-ENERGIES; ELECTROWEAK PARAMETERS; RADIATIVE-CORRECTIONS; PHOTON CORRECTIONS; BHABHA SCATTERING; MONTE-CARLO; TAU; MODEL; Z0 AB We have searched for lepton flavour violation in Z0 boson decays into lepton pairs, Z0 --> mu-tau, Z0 --> e-tau, and Z0 --> e-mu. The data sample is based on an integrated luminosity of 10.4 pb-1 corresponding to 370 000 Z0's produced. We obtain upper limits on the branching ratios of 4.8 x 10(-5) for the mu-tau, 3.4 x 10(-5) for the e-tau and 2.4 x 10(-5) for the e-mu decay modes at the 95% confidence level. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES TECNOL, E-28040 MADRID, SPAIN. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. NAPLES UNIV, I-80125 NAPLES, ITALY. IST NAZL FIS NUCL, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. LENINGRAD NUCL PHYS INST, GATCHINA 188350, USSR. CENT LAB AUTOMAT & INSTRUMENTAT, SOFIA, BULGARIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. IST NAZL FIS NUCL, I-00185 ROME, ITALY. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. PRINCETON UNIV, PRINCETON, NJ 08544 USA. LAB PHYS PARTICULES, F-74519 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST, H-1525 BUDAPEST 114, HUNGARY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV LYON 1, INST PHYS NUCL LYON, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, F-69622 VILLEURBANNE, FRANCE. UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. PAUL SCHERRER INST, WURENLINGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87544 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNION UNIV UNION COLL, SCHENECTADY, NY 12308 USA. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADEVA, B (reprint author), CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. RI D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; Duran, Ignacio/H-7254-2015; Adeva, Bernardo /L-1378-2014; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; OI D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Adeva, Bernardo /0000-0001-9756-3712; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Filthaut, Frank/0000-0003-3338-2247 NR 26 TC 11 Z9 11 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. 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MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARCHIONNI, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, G MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H PANDOULAS, D PAULUZZI, M PAUSS, F PLASIL, F PASSALEVA, G PATRICELLI, S PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z REUCROFT, S RICKER, A RIEMANN, S RIND, O RIPPICH, C RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RUCKSTUHL, W RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, G SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SAVIN, A SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, V SHEVCHENKO, S SHI, XR SHMAKOV, K SHOUTKO, V SHUMILOV, E SMIRNOV, N SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STOEFFL, W STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TARKOVSKY, E TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONG, YP TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TROWITZSCH, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, Z WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SL WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A AF ADEVA, B ADRIANI, O AGUILARBENITEZ, M AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BRUYANT, F BUISSON, C BUJAK, A BURGER, JD BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CIVININI, C CLARE, I CLARE, R COHN, HO COIGNET, G COLINO, N COMMICHAU, V CONFORTO, G CONTIN, A CRIJNS, F CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, Q FAN, SJ FACKLER, O FAY, J FERGUSON, T FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GLAUBMAN, M GOLDFARB, S GONG, ZF GONZALEZ, E GORDEEV, A GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GUANZIROLI, M GUO, JK GURTU, A GUSTAFSON, HR GUTAY, LJ HAAN, H HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HSU, LS HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KARYOTAKIS, Y KAUR, M KHOKHAR, S KHOZE, V KIENZLEFOCACCI, MN KINNISON, W KIRKBY, D KITTEL, W KLIMENTOV, A KONIG, AC KORNADT, O KOUTSENKO, V KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIZMANIC, J KUMAR, KS KUMAR, V KUNIN, A LALIEU, V LANDI, G LANIUS, K LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, D LEEDOM, I LEGOFF, JM LEISTAM, L LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEVCHENKO, PM LEYTENS, X LI, C LI, HT LI, JF LI, L LI, PJ LI, Q LI, XG LIAO, JY LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, R LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MAGAHIZ, R MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARCHIONNI, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, G MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H PANDOULAS, D PAULUZZI, M PAUSS, F PLASIL, F PASSALEVA, G PATRICELLI, S PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z REUCROFT, S RICKER, A RIEMANN, S RIND, O RIPPICH, C RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RUCKSTUHL, W RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, G SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SAVIN, A SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, V SHEVCHENKO, S SHI, XR SHMAKOV, K SHOUTKO, V SHUMILOV, E SMIRNOV, N SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STOEFFL, W STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TARKOVSKY, E TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONG, YP TONISCH, F TONUTTI, M TONWAR, SC TOTH, J TROWITZSCH, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, Z WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SL WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A TI MEASUREMENT OF THE STRONG COUPLING-CONSTANT ALPHA-S FOR BOTTOM QUARKS AT THE Z(0) RESONANCE SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; E+E ANNIHILATION; JET FRAGMENTATION; PHYSICS; MESONS AB We have measured the ratio of the strong coupling constants alpha(s) for bottom quarks and light quarks at the Z0 resonance, in order to test the flavour independence of the strong interaction. The coupling strength alpha(s) has been determined from the fraction of events with three jets, measured for a sample of all hadronic events, and for inclusive muon and electron events. The b purity is evaluated to be 22% for the first data set and 87% for the inclusive lepton sample. We find alpha(s)(b)/alpha(s)(udsc) = 1.00 +/-0.05 (stat.) +/- 0.06 (syst.). C1 UNIV FLORENCE,I-50125 FLORENCE,ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL,E-28040 MADRID,SPAIN. NORTHEASTERN UNIV,BOSTON,MA 02115. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. NAPLES UNIV,I-80125 NAPLES,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. FBLJA PROJECT,WORLD LAB,CH-1211 GENEVA,SWITZERLAND. SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND. MIT,CAMBRIDGE,MA 02139. LENINGRAD NUCL PHYS INST,GATCHINA 188350,USSR. CENT LAB AUTOMAT & INSTRUMENTAT,SOFIA,BULGARIA. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-50125 FLORENCE,ITALY. IST NAZL FIS NUCL,I-80125 NAPLES,ITALY. IST NAZL FIS NUCL,I-06100 PERUGIA,ITALY. THEORET & EXPTL PHYS INST,MOSCOW 117259,USSR. UNIV MICHIGAN,ANN ARBOR,MI 48109. IST NAZL FIS NUCL,I-00185 ROME,ITALY. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. UNIV ALABAMA,UNIVERSITY,AL 35486. UNIV ROME LA SAPIENZA,I-00185 ROME,ITALY. UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND. PRINCETON UNIV,PRINCETON,NJ 08544. LAB PHYS PARTICULES,F-74519 ANNECY LE VIEUX,FRANCE. HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST 114,HUNGARY. RHEIN WESTFAL TH AACHEN,INST PHYS 1,W-5100 AACHEN,GERMANY. RHEIN WESTFAL TH AACHEN,INST PHYS 3,W-5100 AACHEN,GERMANY. NATL INST HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92182. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV LYON 1,INST PHYS NUCL LYON,INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,F-69622 VILLEURBANNE,FRANCE. HIGH ENERGY PHYS GRP,TAIPEI,TAIWAN. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. UNIV SCI & TECHNOL CHINA,HEFEI 230029,PEOPLES R CHINA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS. PAUL SCHERRER INST,WURENLINGEN,SWITZERLAND. SHANGHAI INST CERAM,SHANGHAI,PEOPLES R CHINA. INST HOCHENERGIEPHYS,O-1615 ZEUTHEN BERLIN,GERMANY. UNIV LAUSANNE,CH-1015 LAUSANNE,SWITZERLAND. CALTECH,PASADENA,CA 91125. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. HARVARD UNIV,CAMBRIDGE,MA 02139. UNION UNIV UNION COLL,SCHENECTADY,NY 12308. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. RP ADEVA, B (reprint author), CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. RI Chmeissani, Mokhtar/G-4346-2015; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; Adeva, Bernardo /L-1378-2014; Hoorani, Hafeez/D-1791-2013; Kamyshkov, Yuri/J-7999-2016; OI Chmeissani, Mokhtar/0000-0002-2287-4791; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; D'Alessandro, Raffaello/0000-0001-7997-0306; Adeva, Bernardo /0000-0001-9756-3712; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Levchenko, Petr/0000-0003-4913-0538; Diemoz, Marcella/0000-0002-3810-8530; Filthaut, Frank/0000-0003-3338-2247 NR 20 TC 34 Z9 34 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 21 PY 1991 VL 271 IS 3-4 BP 461 EP 467 DI 10.1016/0370-2693(91)90118-A PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GV616 UT WOS:A1991GV61600032 ER PT J AU SOLLID, JE JOHNSTONE, C GOLOSKIE, D LAZAZZERA, VJ SCHMELL, RA HORN, WW LUNDIN, RL DURAN, EL AF SOLLID, JE JOHNSTONE, C GOLOSKIE, D LAZAZZERA, VJ SCHMELL, RA HORN, WW LUNDIN, RL DURAN, EL TI FABRICATION OF AN UNUSUAL MOSAIC LENS SO APPLIED OPTICS LA English DT Article AB The design philosophy and the construction techniques to make a novel mosaic lens to collect cerenkov radiation are described. The lens blanks were rough cut into segments by a water jet. The segments were cut to the final inner and outer diameters by ultrasonically assisted machining, an unusual new technique developed at the Los Alamos National Laboratory. The technology will soon be available to the public through Sonic Mill Inc., 3820 Academy Parkway North, NE, Albuquerque, N.M. 87109. The advantage of ultrasonically assisted machining lies in rapid, accurate shaping of brittle materials such as ceramics and glass, which can, by this technique, be shaped about as fast as aluminum. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP SOLLID, JE (reprint author), SOLLID OPT INC,365 VALLE SOL,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 20 PY 1991 VL 30 IS 33 BP 4682 EP 4684 PG 3 WC Optics SC Optics GA GX449 UT WOS:A1991GX44900001 PM 20717268 ER PT J AU MIDDLEDITCH, J IMAMURA, JN WOLFF, MT STEIMANCAMERON, TY AF MIDDLEDITCH, J IMAMURA, JN WOLFF, MT STEIMANCAMERON, TY TI HIGH-SPEED MULTICOLOR PHOTOMETRY OF V834 CENTAURUS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, BINARIES; STARS, DWARF NOVAE; STARS, INDIVIDUAL (V834 CEN); STARS, VARIABLES ID QUASI-PERIODIC OSCILLATIONS; TIME-DEPENDENT ACCRETION; CYCLOTRON EMISSION; WHITE-DWARFS; E1405-451; VARIABILITY; SHOCKS; STARS AB High-speed photometric observations of the AM Her object, V834 Centaurus (= 1E1405-451), during its high state revealed the 0.3-0.9 Hz quasi-periodic oscillations (QPOs) with root-mean-square amplitudes of 3.3% +/- 1.1% and 2.5% +/- 0.8% in the V and R bands, respectively, while the U-band amplitude was consistent with zero on one night but was 2.5% +/- 1.2% on the following night. The QPOs in the B band were always consistent with zero. The data were obtained using the 1 m telescope of the Cerro Tololo Inter-American Observatory on the nights of 1990 June 16-21, when the average V magnitude of V834 Cen was almost-equal-to 15.3, confirming the high-luminosity state. The dominance of the QPOs by V-band emission is in contrast to earlier studies by Larsson which found that the QPOs were dominated by emission in the B and R bands, depending upon the luminosity state of V834 Cen. The QPOs of V834 Cen in all cases, however, have frequencies of 0.3-0.9 Hz. The color of the QPOs could thus be highly variable between luminosity states and may be variable in the U band within the high-luminosity state. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV OREGON,INST THEORET PHYS,EUGENE,OR 97403. UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. UNIV SPACE RES ASSOC,COLUMBIA,MD 21044. NASA,AMES RES CTR,THEORET SCI BRANCH,MOFFETT FIELD,CA 94035. NR 21 TC 5 Z9 5 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 NOV 20 PY 1991 VL 382 IS 1 BP 315 EP 320 DI 10.1086/170718 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GP641 UT WOS:A1991GP64100032 ER PT J AU WIEDEMANN, GR HINKLE, KH KEADY, JJ DEMING, D JENNINGS, DE AF WIEDEMANN, GR HINKLE, KH KEADY, JJ DEMING, D JENNINGS, DE TI CN AND HCN IN THE INFRARED-SPECTRUM OF IRC+10216 SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, SPECTRA; STARS, ABUNDANCES; STARS, CIRCUMSTELLAR SHELLS; STARS, INDIVIDUAL (IRC+10216) ID IRC +10216; CIRCUMSTELLAR ENVELOPE; IRC-+10216; BAND AB The abundance of HCN in the inner circumstellar shell of IRC + 10216 has been remeasured using the 12-mu-m nu-2 band. The 12-mu-m lines are less saturated than HCN 3-mu-m lines previously detected in the spectrum of IRC + 10216. The observed 12-mu-m HCN line is formed in the circumstellar shell from about 4 to 12 R* in accord with a photospheric origin for HCN. The derived HCN abundance in the 4 to 12 R* region is 4 x 10(-5) and the column density is 7 x 10(18) cm-2. The 5-mu-m CN vibration-rotation fundamental band was detected for the first time in an astronomical source. Using four CN lines, the CN column density was determined to be 2.6 x 10(15) cm-2 and the rotational temperature to be 8 +/- 2 K. The peak radial abundance is 1 x 10(-5). The values for the temperature and abundance are in good agreement with microwave results and with the formation of CN from the photolysis of HCN. C1 NASA,GODDARD SPACE FLIGHT CTR,PLANETARY SYST BRANCH,GREENBELT,MD 20771. MAX PLANCK INST EXTRATERRESTR PHYS,GARCHING,GERMANY. NATL OPT ASTRON OBSERV,KITT PEAK NATL OBSERV,TUCSON,AZ 85726. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RI Jennings, Donald/D-7978-2012 NR 30 TC 19 Z9 19 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1991 VL 382 IS 1 BP 321 EP 326 DI 10.1086/170719 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GP641 UT WOS:A1991GP64100033 ER PT J AU KLEINMAN, LI AF KLEINMAN, LI TI SEASONAL DEPENDENCE OF BOUNDARY-LAYER PEROXIDE CONCENTRATION - THE LOW AND HIGH NOX REGIMES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ACID DEPOSITION MODEL; CENTRAL UNITED-STATES; HYDROGEN-PEROXIDE; H2O2; TROPOSPHERE; GAS; GENERATION; ATMOSPHERE; CHEMISTRY; OZONE AB Concentrations of H2O2, organic peroxides, and other photochemically generated species were calculated using a zero-dimensional box model. The range of emission rates considered centered on values that are representative of conditions in a moderately polluted region such as the eastern United States. Solar intensity, temperature, humidity, and mixing layer height were varied to simulate changing conditions over a yearly cycle. Predicted concentrations of H2O2 have a pronounced seasonal dependence similar to that observed. Evidence is presented that the seasonal behavior of peroxide concentration is due to a transition between two qualitatively different photochemical states of the atmosphere. These states are called the low and high NOx regimes according to whether radical production is greater or less than the NOx emission rate. In the low NOx regime, more radicals are formed than can be accommodated by reaction with NOx, and the "excess" radicals are removed by bimolecular radical-radical reactions leading in large part to peroxides. In this regime, peroxide formation is nearly proportional to the difference between radical source strength and the NOx emission rate and peroxide concentration scales with the factors affecting radical source strength (e.g., water vapor and photolysis rate constants). Radical production in the high NOx regime is insufficient to react with and remove all NOx. Consequences include the suppression of peroxide formation, a reduction in the oxidizing capacity of the atmosphere, and high concentrations of primary pollutants. RP KLEINMAN, LI (reprint author), BROOKHAVEN NATL LAB, DEPT APPL SCI, DIV ENVIRONM CHEM, UPTON, NY 11973 USA. NR 35 TC 120 Z9 122 U1 2 U2 13 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1991 VL 96 IS D11 BP 20721 EP 20733 DI 10.1029/91JD02040 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GR285 UT WOS:A1991GR28500003 ER PT J AU KIM, S BAE, IT SANDIFER, M ROSS, PN CARR, R WOICIK, J ANTONIO, MR SCHERSON, DA AF KIM, S BAE, IT SANDIFER, M ROSS, PN CARR, R WOICIK, J ANTONIO, MR SCHERSON, DA TI INSITU XANES OF AN IRON PORPHYRIN IRREVERSIBLY ADSORBED ON AN ELECTRODE SURFACE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID X-RAY ABSORPTION; SPECTROSCOPY; MOSSBAUER; EXAFS AB In situ iron K-edge X-ray absorption near edge structure, XANES, has been employed to examine the axial coordination of (mu-oxo)bis[iron meso-tetrakis(4-methoxyphenyl)porphyrin] (FeTMPP)2O, irreversibly adsorbed on a high area carbon substrate, Black Pearl (BP), as a function of applied potential. Analysis of the XANES provides conclusive evidence that the coordination about Fe3+ in the supported, fully oxidized macrocycle is remarkably different from that about Fe2+ in the corresponding fully reduced macrocycle. In the adsorbed, oxidized state, (FeTMPP)2O retains its mu-oxo character and it undergoes a two-electron reduction to yield predominantly four-coordinate square-planar FeTMPP without axial ligation. C1 CASE WESTERN RESERVE UNIV,CASE CTR ELECTROCHEM SCI,CLEVELAND,OH 44106. CASE WESTERN RESERVE UNIV,DEPT CHEM,CLEVELAND,OH 44106. BP RES,CLEVELAND,OH 44128. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. NR 20 TC 32 Z9 32 U1 2 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 20 PY 1991 VL 113 IS 24 BP 9063 EP 9066 DI 10.1021/ja00024a006 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA GQ931 UT WOS:A1991GQ93100006 ER PT J AU ZHANG, K GONZALEZ, AA MUKERJEE, SL CHOU, SJ HOFF, CD KUBATMARTIN, KA BARNHART, D KUBAS, GJ AF ZHANG, K GONZALEZ, AA MUKERJEE, SL CHOU, SJ HOFF, CD KUBATMARTIN, KA BARNHART, D KUBAS, GJ TI SOLUTION CALORIMETRIC AND STOPPED-FLOW KINETIC-STUDY OF LIGAND SUBSTITUTION FOR THE COMPLEXES M(CO)3(PCY3)2(L) (M = CR, MO, W) - COMPARISON OF 1ST-ROW, 2ND-ROW, AND 3RD-ROW TRANSITION-METAL LIGAND BONDS AT A STERICALLY CROWDED METAL CENTER SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; GAS-PHASE; CARBONYLS; SPECTROSCOPY; DISSOCIATION; NITROGEN AB The substitution of pyridine by trimethyl phosphite in the complexes M(CO)3(PCy3)2(py) (M = Cr, Mo) has been studied by stopped-flow kinetics. Direct reactions of the proposed intermediate complexes M(CO)3(PCy3)2 (M = Cr, Mo) have also been studied. The crystal structure of Cr(CO)3(PCy3)2 has been determined and shows an an agostic M...H-C interaction. Cell parameters: a = 10.127 (2) angstrom, b = 12.524 (3) angstrom, c = 15.329 (3) angstrom, beta = 90.93 (3)degrees, gamma = 103.28 (3)degrees, space group P1BAR, Z = 2. These results are combined with calorimetric measurements, and with earlier data on the isostructural W complex, to give a complete picture of ligand substitution in these sterically crowded complexes. The relative rates of dissociation of the M-py bond are in the order Cr > Mo > W in the approximate ratio 4800/300/1. The relative rates of reaction of the formally coordinatively unsaturated complexes M(CO)3(PCy3)2 with trimethyl phosphite are in the order Mo > W > Cr in the approximate ratio 80/36/1. Due to these changes in relative magnitude for the rate constants, the chromium complex does not obey simple steady-state kinetics. Solution calorimetric measurements show that the enthalpies of binding of pyridine and trimethyl phosphite are as follows: W, -19 and -26 kcal/mol; Mo, -17 and -24 kcal/mol; Cr, -16 and -11 kcal/mol. Enthalpies of activation for dissociation of pyridine: W, -22.6 kcal/mol; Mo, -21.9 kcal/mol; Cr, -1 5.1 kcal/mol. The activation energy for addition of py to M(CO)3(PCy3)2 is about 4 kcal/mol for all three metals and probably involves concerted attack at the agostic bond. C1 UNIV MIAMI, DEPT CHEM, CORAL GABLES, FL 33124 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 30 TC 59 Z9 59 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 20 PY 1991 VL 113 IS 24 BP 9170 EP 9176 DI 10.1021/ja00024a023 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA GQ931 UT WOS:A1991GQ93100023 ER PT J AU DEWITT, JG BENTSEN, JG ROSENZWEIG, AC HEDMAN, B GREEN, J PILKINGTON, S PAPAEFTHYMIOU, GC DALTON, H HODGSON, KO LIPPARD, SJ AF DEWITT, JG BENTSEN, JG ROSENZWEIG, AC HEDMAN, B GREEN, J PILKINGTON, S PAPAEFTHYMIOU, GC DALTON, H HODGSON, KO LIPPARD, SJ TI X-RAY ABSORPTION, MOSSBAUER, AND EPR STUDIES OF THE DINUCLEAR IRON CENTER IN THE HYDROXYLASE COMPONENT OF METHANE MONOOXYGENASE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID METHYLOCOCCUS-CAPSULATUS-BATH; METHYLOSINUS-TRICHOSPORIUM OB3B; INTRA-CYTOPLASMIC MEMBRANES; ELECTRON-PARAMAGNETIC-RES; PURPLE ACID-PHOSPHATASE; MONO-OXYGENASE; RIBONUCLEOTIDE REDUCTASE; ESCHERICHIA-COLI; FINE-STRUCTURE; OXO PROTEINS AB The dinuclear iron center of the hydroxylase component (protein A) of methane monooxygenase isolated from M. capsulatus (Bath) has been studied by EXAFS, Mossbauer, and EPR spectroscopy. Highly purified hydroxylase, which exhibits a featureless visible absorption spectrum above 300 nm, has been obtained. Analysis of the Fe K-edge EXAFS data for the hydroxylase in the oxidized Fe(III)Fe(III) state gives an Fe...Fe distance of 3.42 angstrom and an average first shell Fe-O/N distance of 2.04 angstrom. Three of four oxidized hydroxylase samples investigated were photoreduced by the X-ray beam to give an EPR detectable mixed-valent Fe(II)Fe(III) form of the enzyme with g(av) = 1.83. For these mixed-valent samples, an Fe...Fe distance of 3.41-3.43 angstrom and an average first shell Fe-O/N distance of 2.06-2.09 angstrom were determined. The EXAFS data for the photoreduced M. trichosporium OB3b hydroxylase are similar to those obtained for the M. capsulatus (Bath) samples, suggesting that the two proteins contain similar diiron cores. The absence of a short Fe-0 distance indicates that the hydroxylase does not contain an oxo bridge. In addition, the results of the first shell fits suggest that the iron atoms are coordinated to more oxygen than nitrogen donor ligands. From a study of the power saturation behavior of the EPR spectrum obtained for the photoreduced M. capsulatus (Bath) sample, an antiferromagnetic exchange coupling constant J = -32 cm-1 was measured. This value is consistent with the presence of a monodentate ligand such as hydroxo, alkoxo, or monodentate carboxylato bridging the Fe(II)Fe(III) center and with the presence of at least one other bridging group, most likely a syn,syn bidentate carboxylate. For Fe(II)Fe(II) hydroxylase EXAFS samples, 85% in the fully reduced state as judged by Mossbauer spectroscopy, no resolvable Fe...Fe interaction could be detected, and an average first shell Fe-O/N distance of 2.15 angstrom was obtained. The Fe K-edge EXAFS spectrum of the diferric model complex [Fe2O(O2CH)4(BIPhMe)2] Was also obtained and compared to the protein data. Contrary to our earlier work, we have found that the best fit Fe...Fe distance of the hydroxylase samples is dependent on the model compound used to determine parameters for data analysis. The potential consequences of this finding to the analysis of EXAFS data obtained for other iron oxo proteins is discussed. C1 UNIV WARWICK,DEPT BIOL SCI,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. MIT,DEPT CHEM,CAMBRIDGE,MA 02139. MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. NR 109 TC 218 Z9 218 U1 4 U2 36 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 20 PY 1991 VL 113 IS 24 BP 9219 EP 9235 DI 10.1021/ja00024a031 PG 17 WC Chemistry, Multidisciplinary SC Chemistry GA GQ931 UT WOS:A1991GQ93100031 ER PT J AU GOYAL, A OLIVER, WC FUNKENBUSCH, PD KROEGER, DM BURNS, SJ AF GOYAL, A OLIVER, WC FUNKENBUSCH, PD KROEGER, DM BURNS, SJ TI MECHANICAL-PROPERTIES OF HIGHLY ALIGNED YBA2CU3O7-DELTA - EFFECT OF Y2BACUOX PARTICLES SO PHYSICA C LA English DT Article ID SINGLE-CRYSTALS; BRILLOUIN SPECTROSCOPY; SOUND VELOCITIES; TRANSITION; SUPERCONDUCTOR; ULTRASOUND; PRESSURE AB The elastic modulus and hardness of highly aligned YBa2Cu3O7-delta obtained by melt processing was determined using a highly spatially resolved mechanical properties microprobe. Ultra-low load indentation measurements on the (001) cleavage plane of aligned 123, indicated a Young's modulus of 143 +/- 4 GPa and a hardness of 10.0 +/- 1.9 GPa. For measurements on a plane perpendicular to the cleavage plane, values of 182 +/- 4 GPa for the modulus and 10.8 +/- 1.7 GPa for the hardness were obtained. A lower modulus in the c-direction is perhaps a result of the layer-like structure of 123, with weak coupling between the layers. Measurements on the trapped single crystal 211 particles yielded a modulus of 213 +/- 5 GPa and a hardness of 14.4 +/- 2 GPa. Considerations of the thermal and elastic mismatch effects between the 211 particles and the 123 matrix, the large thermal expansion anisotropy of aligned 123, and microstructural examination of polished and fracture surfaces of the aligned samples indicate that the 211 particles perhaps serve to enhance the fracture resistance behavior of 123 by energy dissipation due to interfacial delamination and crack bridging. C1 UNIV ROCHESTER,DEPT MECH ENGN,MAT SCI PROGRAM,ROCHESTER,NY 14627. RP GOYAL, A (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 43 TC 85 Z9 85 U1 1 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 NOV 20 PY 1991 VL 183 IS 4-6 BP 221 EP 233 DI 10.1016/0921-4534(91)90566-H PG 13 WC Physics, Applied SC Physics GA GU921 UT WOS:A1991GU92100004 ER PT J AU SEIDLER, GT ROSENBAUM, TF HEINZ, DL DOWNEY, JW PAULIKAS, AP VEAL, BW AF SEIDLER, GT ROSENBAUM, TF HEINZ, DL DOWNEY, JW PAULIKAS, AP VEAL, BW TI SCALING OF THE IRREVERSIBILITY LINE WITH SUPERCONDUCTING TRANSITION-TEMPERATURE IN OXYGEN DEFICIENT YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; BA-CU-O; INSULATOR TRANSITION; PHASE-TRANSITIONS; FILMS; RESISTIVITY; CRYSTALS; STATE AB We report AC susceptibility and resistivity measurements of the vortex motion in single crystal YBa2Cu3O7-delta, with delta-approximately 0.62. The superconducting transition temperature was varied from 7 K to 17 K by altering the oxygen vacancy ordering in the chains. We find that both the slope of the irreversibility line and its extrapolated zero temperature value scale linearly with T(c), providing strong evidence for the intrinsic nature of the irreversibility line. Moreover, the reduced magnetic field scale of oxygen deficient crystals allows us to obtain new results at previously inaccessible reduced temperatures, well below T(c). C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SEIDLER, GT (reprint author), UNIV CHICAGO,SCI & TECHNOL CTR SUPERCOND,CHICAGO,IL 60637, USA. RI Seidler, Gerald/I-6974-2012 NR 30 TC 29 Z9 29 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 NOV 20 PY 1991 VL 183 IS 4-6 BP 333 EP 338 DI 10.1016/0921-4534(91)90579-N PG 6 WC Physics, Applied SC Physics GA GU921 UT WOS:A1991GU92100017 ER PT J AU DUKAN, S ANDREEV, AV TESANOVIC, Z AF DUKAN, S ANDREEV, AV TESANOVIC, Z TI SUPERCONDUCTIVITY IN A HIGH MAGNETIC-FIELD - EXCITATION SPECTRUM AND DEHAAS-VANALPHEN OSCILLATION SO PHYSICA C LA English DT Article AB The excitation spectrum of a superconductor placed in the magnetic field high enough so that the inter-Landau level pairing can be ignored is shown to be gapless. The gap turns to zero at the set of points in the magnetic Brillouin zone which are in correspondence to the chosen vortex lattice in the real space. This leads to the algebraic temperature dependences of the thermodynamic potential, heat capacity and the amplitude of the dHvA oscillations at low temperatures. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP DUKAN, S (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. NR 15 TC 43 Z9 43 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 20 PY 1991 VL 183 IS 4-6 BP 355 EP 359 DI 10.1016/0921-4534(91)90582-J PG 5 WC Physics, Applied SC Physics GA GU921 UT WOS:A1991GU92100020 ER PT J AU ZHOU, P CHENG, J SUN, SZ SCHAUS, CF HAINS, C MYERS, DR VAWTER, GA AF ZHOU, P CHENG, J SUN, SZ SCHAUS, CF HAINS, C MYERS, DR VAWTER, GA TI SURFACE-EMITTING LASER-BASED OPTICAL BISTABLE SWITCHING DEVICE SO APPLIED PHYSICS LETTERS LA English DT Article AB The first experimental demonstration of a surface-normal bistable optical switching device based on the monolithic integration of a vertical-cavity surface-emitting laser and a pnpn photothyristor is reported. By the use of ion implantation, it is shown that the positive feedback in the photothyristor can be controlled, thus enabling the integration of both bistable and latching optical switches on the same epitaxial structure. High contrast (30 dB) and an optical gain of 8 are demonstrated. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ZHOU, P (reprint author), UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131, USA. NR 5 TC 5 Z9 5 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 NOV 18 PY 1991 VL 59 IS 21 BP 2648 EP 2650 DI 10.1063/1.105926 PG 3 WC Physics, Applied SC Physics GA GP906 UT WOS:A1991GP90600007 ER PT J AU DALAL, KB LEVEN, RM YEE, T AF DALAL, KB LEVEN, RM YEE, T TI LIPID AND MEMBRANE FLUIDITY ABNORMALITIES IN PLATELETS AND MEGAKARYOCYTES OF THE HEREDITARY MACROTHROMBOCYTOPENIC WISTAR FURTH RAT SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE LIPID BIOSYNTHESIS; PLATELET; MEMBRANE FLUIDITY; MEGAKARYOCYTE; (RAT) ID RABBIT PLATELETS; CHOLESTEROL; CELL; BIOSYNTHESIS; PLASMA; MODEL AB Biochemical and functional abnormalities of megakaryocytes and platelets were studied in Wistar Furth (WF) rats which have genetically determined macrothrombocytopenia and megakaryocytopenia, and were compared with their counterparts in Sprague-Dawley (SD) rats. Both megakaryocytes and platelets synthesized phospholipids from [C-14]acetate. WF and SD megakaryocytes incorporated 0.27 and 0.29 nmol acetate per 10(6) cells, respectively. Phosphatidylcholine (PC) accounted for 64% and 58% of the PL radioactive label in megakaryocytes of SD and WF rats, respectively, (P < 0.05), while 69% of labeled activity was associated with PC and SD platelets compared to 60% found in PC of WF platelets (P < 0.01). In WF platelets a significant increase in the levels of lysophosphatidylcholine (6.1% vs. 3.0%) was observed. WF platelets had substantially higher levels of esterified cholesterol, triglycerides, ceramides and a 3-fold increase in the total protein per platelet compared to SD platelets. The fatty acid composition of WF platelet PC showed quantitative abnormalities. Plasma lecithin-cholesterol acyl transferase activity and platelet function monitored by the uptake and release of [C-14] serotonin showed nonsignificant variations between SD and WF rats. Compared with the control, platelet membrane fluidity, measured by fluorescence polarization using platelets labeled with 1,6-diphenyl-1,3,5-hexatriene, was significantly decreased in the WF rats. RP DALAL, KB (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,74-157,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 24 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD NOV 18 PY 1991 VL 1070 IS 1 BP 253 EP 258 DI 10.1016/0005-2736(91)90172-5 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GT988 UT WOS:A1991GT98800034 PM 1751531 ER PT J AU BORNER, HG CASTEN, RF FORSTER, I LIEBERZ, D VONBRENTANO, P ROBINSON, SJ VONEGIDY, T HLAWATSCH, G LINDNER, H GELTENBORT, P HOYLER, F FAUST, H COLVIN, G KANE, WR MACPHAIL, M AF BORNER, HG CASTEN, RF FORSTER, I LIEBERZ, D VONBRENTANO, P ROBINSON, SJ VONEGIDY, T HLAWATSCH, G LINDNER, H GELTENBORT, P HOYLER, F FAUST, H COLVIN, G KANE, WR MACPHAIL, M TI LEVEL STRUCTURE OF OS-191 - COEXISTING OBLATE AND PROLATE CONFIGURATIONS SO NUCLEAR PHYSICS A LA English DT Article DE NUCLEAR REACTIONS OS-190(N,GAMMA); (N,E); E = THERMAL, RESONANCE; MEASURED E-GAMMA; I-GAMMA; GAMMA-GAMMA-COIN; I(CE); OS-190(D,T); E = 20 MEV; MEASURED SIGMA(ET); OS-191 DEDUCED LEVELS; J; PI; ICC; GAMMA-MULTIPOLARITY ID NILSSON MODEL; NEUTRON-CAPTURE; SYMMETRY SCHEME; NUCLEI; FRAGMENTATION; STRENGTH; REACTOR; PT-196; STATES; REGION AB An extensive level scheme for the transitional nucleus Os-191 has been constructed on the basis of (n, gamma), n, e-) and (d, t) reaction data. gamma-rays following thermal capture and average resonance capture (ARC) were detected with pair spectrometers. Secondary gamma-ray spectra were obtained with the GAMS bent crystal spectrometers. The high precision of the resultant energies was the critical factor in developing a level scheme on the basis of Ritz combinations. gamma-gamma coincidences were obtained from both primary and secondary transitions. Conversion electrons, detected with the BILL spectrometer, gave multipolarity information. The (d, t) reaction measured with a Q3D magnetic spectrometer gave additional information on the hole states in Os-191. A discussion of the resulting level scheme briefly reviews the fragmentation of negative-parity strength but focuses mostly on a rare example of an anti-aligned decoupled set of coexisting positive-parity states. For these, triaxial particle-plus-rotor calculations are carried out. Reasonable agreement is obtained and the calculations also explain the unusually strong population in (n, gamma) of this set of mostly medium spin states. C1 UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE,GERMANY. TECH UNIV MUNICH,W-8046 GARCHING,GERMANY. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BORNER, HG (reprint author), INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. NR 31 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 18 PY 1991 VL 534 IS 2 BP 255 EP 293 DI 10.1016/0375-9474(91)90498-U PG 39 WC Physics, Nuclear SC Physics GA GR664 UT WOS:A1991GR66400003 ER PT J AU DELIS, DN BLUMENFELD, Y BOWMAN, DR COLONNA, N HANOLD, K JING, K JUSTICE, M MENG, JC PEASLEE, GF WOZNIAK, GJ MORETTO, LG AF DELIS, DN BLUMENFELD, Y BOWMAN, DR COLONNA, N HANOLD, K JING, K JUSTICE, M MENG, JC PEASLEE, GF WOZNIAK, GJ MORETTO, LG TI MASS ASYMMETRIC FISSION-BARRIERS FOR BR-75 SO NUCLEAR PHYSICS A LA English DT Article DE NUCLEAR REACTIONS C-12(CU-63, X); E = 5-12.7 MEV NUCLEON; MEASURED SIGMA-(FRAGMENT THETA) SPECTRA; DEDUCED SOURCE VELOCITIES; CHARGE DISTRIBUTIONS; SIGMA(Z) VS E; BR-75 DEDUCED MASS ASYMMETRIC FISSION BARRIERS ID COMPLEX-FRAGMENT EMISSION; 12.6 MEV-NUCLEON; ANGULAR-MOMENTUM; COMPOUND-NUCLEUS; FUSION; SYSTEMATICS; ENERGY; CONFIGURATIONS; EXCITATION AB Fragments with atomic numbers covering nearly the entire range of the mass-asymmetry coordinate (4 < Z < 27) were observed from the 5.0, 6.2, 6.9, 8.0, 10.2 and 12.7 MeV/A Cu-63 + C-12 reactions. Energy spectra and angular distributions show the presence of projectile-like and target-like components along with an isotropic component. The isotropic component appears as a Coulomb ring in the invariant cross-section plots indicating the presence of a binary compound nucleus decay which is confirmed by the coincidence data. Excitation functions were constructed for each Z value and a nearly complete set of mass-asymmetric barriers has been extracted for Br-75. There is excellent agreement between the experimentally determined barriers and the finite-range model predictions. RP DELIS, DN (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 44 TC 18 Z9 19 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 NOV 18 PY 1991 VL 534 IS 2 BP 403 EP 428 DI 10.1016/0375-9474(91)90509-5 PG 26 WC Physics, Nuclear SC Physics GA GR664 UT WOS:A1991GR66400014 ER PT J AU BENNETT, SJ FREER, M FULTON, BR MURGATROYD, JT WOODS, PJ ALLCOCK, SC RAE, WDM SMITH, AE LILLEY, JS BETTS, RR AF BENNETT, SJ FREER, M FULTON, BR MURGATROYD, JT WOODS, PJ ALLCOCK, SC RAE, WDM SMITH, AE LILLEY, JS BETTS, RR TI SYMMETRICAL AND NEAR-SYMMETRICAL FISSION OF MG-24, SI-28 AND S-32 SO NUCLEAR PHYSICS A LA English DT Article DE NUCLEAR REACTIONS C-12(SI-28, F); (SI-28, X); (S-32, F); (S-32, X); E = 200 MEV; C-12(MG-24, F); (MG-24, X); E = 180 MEV; MEASURED FISSION; REACTION (FRAGMENT)(FRAGMENT)-COIN; DEDUCED REACTION MECHANISM; MG-24, SI-28, S-32 DEDUCED FISSION CHARACTERISTICS ID INELASTIC-SCATTERING; RESONANCES; EXCITATION; DECAY; C-12 AB In several recent measurements the symmetric fission of Mg-24 has been reported. In this paper the results of a search for similar processes in Si-28 and S-32 are presented. In contrast to the results for Mg-24, no evidence is seen for the fission of Si-28 to O-16 + C-12 or S-32 to O-16 + O-16 following inelastic excitation. However, these processes are observed to occur following pickup onto Mg-24. The results are consistent with a simple model of the fission process developed by Harvey and suggest the existence of large scale cluster structure in all three nuclei. C1 UNIV OXFORD,DEPT NUCL PHYS,OXFORD OX1 3RH,ENGLAND. SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP BENNETT, SJ (reprint author), UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. RI Freer, Martin/F-9379-2013 NR 18 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 18 PY 1991 VL 534 IS 2 BP 445 EP 460 DI 10.1016/0375-9474(91)90511-4 PG 16 WC Physics, Nuclear SC Physics GA GR664 UT WOS:A1991GR66400016 ER PT J AU FRIEMAN, JA GRADWOHL, BA AF FRIEMAN, JA GRADWOHL, BA TI DARK MATTER AND THE EQUIVALENCE PRINCIPLE SO PHYSICAL REVIEW LETTERS LA English DT Article ID GALACTIC HALOS; COMA CLUSTER; GALAXIES AB If the dark matter in galaxies and clusters is nonbaryonic, it can interact with additional long-range fields that are invisible to experimental tests of the equivalence principle. We discuss the astrophysical and cosmological implications of a long-range force coupled only to the dark matter and find rather tight constraints on its strength. If the force is repulsive (attractive), the masses of galaxy groups and clusters (and the mean density of the Universe inferred from them) have been systematically underestimated (overestimated). Such an interaction also has unusual implications for the growth of large-scale structure. RP FRIEMAN, JA (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 23 TC 49 Z9 49 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 18 PY 1991 VL 67 IS 21 BP 2926 EP 2929 DI 10.1103/PhysRevLett.67.2926 PG 4 WC Physics, Multidisciplinary SC Physics GA GQ408 UT WOS:A1991GQ40800002 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BAILEY, M BAMBERGER, A BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J 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 BYON, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M COUSINS, R CRANE, D CURATOLO, M DAY, C DELLAGNELLO, S DELLORSO, M DEMORTIER, L DERWENT, PF DEVLIN, T DIBITONTO, D DRUCKER, RB ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUKUI, Y FUNAYAMA, Y GARFINKEL, AF GAUTHIER, A GEER, S 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 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, S KIRSCH, L KONDO, K KONIGSBERG, J KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LI, W LISS, TM LOCKYER, N LUCHINI, CB MAAS, P MANGANO, M MARRINER, JP 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 PARA, A PARE, E PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SEKIGUCHI, M SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L 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 TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL YAGIL, A YAMASHITA, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZETTI, F AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BAILEY, M BAMBERGER, A BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J 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 BYON, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M COUSINS, R CRANE, D CURATOLO, M DAY, C DELLAGNELLO, S DELLORSO, M DEMORTIER, L DERWENT, PF DEVLIN, T DIBITONTO, D DRUCKER, RB ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUKUI, Y FUNAYAMA, Y GARFINKEL, AF GAUTHIER, A GEER, S 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 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, S KIRSCH, L KONDO, K KONIGSBERG, J KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LI, W LISS, TM LOCKYER, N LUCHINI, CB MAAS, P MANGANO, M MARRINER, JP 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 PARA, A PARE, E PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SEKIGUCHI, M SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L 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 TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL YAGIL, A YAMASHITA, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZETTI, F TI MEASUREMENT OF THE Z-BOSON PT DISTRIBUTION IN PBARP COLLISIONS AT SQUARE-ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID COLLIDER AB We have measured the Z-boson production differential cross section as a function of transverse momentum using Z --> ee and Z --> mu-mu-decays in ppBAR collisions at square-root s = 1.8 TeV with the Collider Detector at Fermilab. Comparison with standard-model predictions shows good agreement over the range 0 < p(T) < 160 GeV/c available from this data sample. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, FRASCATI, ITALY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA. TEXAS A&M UNIV SYST, COLLEGE STN, TX 77843 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 305, JAPAN. TUFTS UNIV, MEDFORD, MA 02155 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. RP ABE, F (reprint author), KEK NAT LAB HIGH ENERGY PHYS, NATL LAB HIGH ENERGY PHYS, IBARAKI, 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 12 TC 34 Z9 34 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 18 PY 1991 VL 67 IS 21 BP 2937 EP 2941 DI 10.1103/PhysRevLett.67.2937 PG 5 WC Physics, Multidisciplinary SC Physics GA GQ408 UT WOS:A1991GQ40800005 ER PT J AU BROSS, A CRISLER, M PORDES, S VOLK, J ERREDE, S WRBANEK, J AF BROSS, A CRISLER, M PORDES, S VOLK, J ERREDE, S WRBANEK, J TI SEARCH FOR SHORT-LIVED PARTICLES PRODUCED IN AN ELECTRON-BEAM DUMP SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; BHABHA SCATTERING; EXCITATION-FUNCTION; NEUTRAL PARTICLE; POSITRON; AXION; MASS; BREMSSTRAHLUNG; ENERGIES; SPECTRA AB A search for short-lived neutral particles which decay to electron-positron pairs has been carried out using a beam of 275-GeV electrons incident on an instrumented tungsten beam dump. The experiment was sensitive to particles up to 10 MeV/c2 in mass and down to 4 x 10(-16) sec in lifetime. C1 UNIV ILLINOIS,URBANA,IL 61801. RP BROSS, A (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 27 TC 75 Z9 75 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 18 PY 1991 VL 67 IS 21 BP 2942 EP 2945 DI 10.1103/PhysRevLett.67.2942 PG 4 WC Physics, Multidisciplinary SC Physics GA GQ408 UT WOS:A1991GQ40800006 ER PT J AU HAPPEK, U SIEVERS, AJ BLUM, EB AF HAPPEK, U SIEVERS, AJ BLUM, EB TI OBSERVATION OF COHERENT TRANSITION RADIATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID CERENKOV RADIATION AB Coherent transition radiation, generated by the passage of mm-long bunches of electrons through a thin metal foil, has been observed in the far infrared. The intensity was compared to the smaller amount of Cherenkov radiation produced when SF6 gas was introduced into the electron path. Wake-field radiation was ruled out by varying the geometry of the metal chamber near the electron beam. The intensity, the polarization, and the spectral and angular distribution of the transition radiation were measured and its coherent nature was identified. C1 CORNELL UNIV,CTR MAT SCI,ITHACA,NY 14853. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP HAPPEK, U (reprint author), CORNELL UNIV,ATOM & SOLID STATE PHYS LAB,ITHACA,NY 14853, USA. NR 12 TC 149 Z9 149 U1 2 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 18 PY 1991 VL 67 IS 21 BP 2962 EP 2965 DI 10.1103/PhysRevLett.67.2962 PG 4 WC Physics, Multidisciplinary SC Physics GA GQ408 UT WOS:A1991GQ40800011 ER PT J AU SHORE, HB ROSE, JH AF SHORE, HB ROSE, JH TI THEORY OF IDEAL METALS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP SHORE, HB (reprint author), SAN DIEGO STATE UNIV,DEPT PHYS,SAN DIEGO,CA 92182, USA. NR 4 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 18 PY 1991 VL 67 IS 21 BP 3045 EP 3045 DI 10.1103/PhysRevLett.67.3045 PG 1 WC Physics, Multidisciplinary SC Physics GA GQ408 UT WOS:A1991GQ40800034 ER PT J AU HILL, TG WANG, P HUSTON, ME WARTCHOW, CA OEHLER, LM SMITH, MB BEDNARSKI, MD CALLSTROM, MR AF HILL, TG WANG, P HUSTON, ME WARTCHOW, CA OEHLER, LM SMITH, MB BEDNARSKI, MD CALLSTROM, MR TI CARBOHYDRATE PROTEIN CONJUGATES (CPC) - THE DESIGN OF NEW MATERIALS TO STABILIZE ENZYMES SO TETRAHEDRON LETTERS LA English DT Article ID POLYVINYL SACCHARIDE)S; IMMOBILIZED ENZYMES; OLIGOSACCHARIDES; POLYSACCHARIDES; POLYMERIZATION; CHYMOTRYPSIN AB This paper describes the preparation of a series of carbohydrate-based materials that stabilize proteins. We report the synthesis of a series of carbohydrate-based polymers which contain a high-density of masked aldehyde functionality, the coupling of proteases to these materials through their epsilon-lysine residues by reductive amination methodology, and the remarkable stability of these carbohydrate protein conjugates of proteases [CPC(proteases)] at elevated temperatures in distilled water and buffered solutions. This mild, multi-site attachment reaction does not significantly alter the active site of the enzymes. C1 OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RP BEDNARSKI, MD (reprint author), OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210, USA. NR 38 TC 20 Z9 20 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD NOV 18 PY 1991 VL 32 IS 47 BP 6823 EP 6826 DI 10.1016/0040-4039(91)80416-4 PG 4 WC Chemistry, Organic SC Chemistry GA GU888 UT WOS:A1991GU88800001 ER PT J AU WANG, P HILL, TG BEDNARSKI, MD CALLSTROM, MR AF WANG, P HILL, TG BEDNARSKI, MD CALLSTROM, MR TI THE CATALYTIC FORMATION OF PEPTIDE-BONDS WITH CARBOHYDRATE PROTEIN CONJUGATES OF PROTEASES [CPC(PROTEASES)] SO TETRAHEDRON LETTERS LA English DT Article ID COSOLVENT-MEDIATED CONVERSION; ALPHA-CHYMOTRYPSIN; ORGANIC-SOLVENTS; ENZYMATIC-SYNTHESIS; METHYL-ESTER; AMINO-ACIDS; IMMOBILIZED THERMOLYSIN; IRREVERSIBLE SYNTHESIS; ASPARTAME PRECURSOR; CONDENSATION AB This paper describes the use of carbohydrate protein conjugates of proteases [CPC(proteases)] for the catalytic formation of peptide bonds. We have found that CPC(proteases) are stable in organic solvents and perform at truly catalytic levels and have demonstrated a basis set of transformations that allow for convergent peptide synthesis. C1 OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP BEDNARSKI, MD (reprint author), OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210, USA. NR 44 TC 9 Z9 9 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD NOV 18 PY 1991 VL 32 IS 47 BP 6827 EP 6830 DI 10.1016/0040-4039(91)80417-5 PG 4 WC Chemistry, Organic SC Chemistry GA GU888 UT WOS:A1991GU88800002 ER PT J AU BURNS, JH SACHLEBEN, RA AF BURNS, JH SACHLEBEN, RA TI COMPLEXES OF LITHIUM AND SODIUM WITH SYM-(DIBENZO-14-CROWN-4)METHYLPHENYL PHOSPHINIC ACID SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID LARIAT ETHER; CRYSTAL; CROWN AB (1) (6-Methylphenylphosphinato-2,3,9,10-dibenzo-1,4,8,11-tetraoxacyclotetradeca-2,9-diene)-lithium-ethanol (1/1), [Li(C25H26PO6)].C2H5OH, M(r) = 506.46, triclinic, P1BAR, a = 10.158 (1), b = 10.663 (1), c = 12.766 (2) angstrom, alpha = 100.93 (1), beta = 109.55 (1), gamma = 99.10 (1)-degrees, V = 1242.2 (6) angstrom 3, Z = 2, D(x) = 1.35 g cm-3, lambda(Mo K-alphaBAR) = 0.71069 angstrom, mu = 1.49 cm-1, F(000) = 536, T = 295 K, R(F) = 0.048 for 1712 reflections [I > sigma(I)]. (2) (6-Methylphenylphosphinato-2,3,9,10-dibenzo-1,4,8,11-tetraoxacyclotetradeca-2,9-diene)diaquasodium trihydrate, [Na(C25H26PO6)(H2O)2].3H2O, M(r) = 566.52, triclinic, P1BAR, a = 10.493 (6), b = 11.770 (5), c = 13.162 (5) angstrom, alpha = 98.16 (3), beta = 108.73 (4), gamma = 108.81 (4)-degrees, V = 1402 (3) angstrom 3, Z = 2, D(x) = 1.35, D(m) = 1.34 g cm-3, lambda(Mo K-alphaBAR) = 0.71069 angstrom, mu = 1.63 cm-1, F(000) = 600, T = 296 K, R(F) = 0.058 for 2849 reflections [I > sigma(I)]. In neither compound is there intramolecular bonding of the phosphinate anion to the cation enclosed in the crown. Compound (1) crystallizes as dimers in which the phosphinate group of one ligand is bonded to the Li+ ion enclosed in the ether cavity of its partner and vice versa. Molecules of compound (2) are isolated from each other by channels of water molecules. RP BURNS, JH (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD NOV 15 PY 1991 VL 47 BP 2339 EP 2343 DI 10.1107/S0108270191005802 PN 11 PG 5 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GR136 UT WOS:A1991GR13600023 ER PT J AU CROMER, DT STORM, CB AF CROMER, DT STORM, CB TI STRUCTURE OF 3-AMINO-5-NITRO-1,2,4-TRIAZOLE HYDRATE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID 3-NITRO-1,2,4-TRIAZOL-5-ONE; SALT AB C2H3N5O2.H2O, M(r) = 147.09, monoclinic, P2(1)/c, a = 11.129 (3), b = 15.227 (3), c = 7.130 (2) angstrom, beta = 101.29 (2)-degrees, V = 1184.88 angstrom 3, Z = 8, D(x) = 1.649 g cm-3, lambda(Mo K-alpha-1) = 0.70926 angstrom, mu = 1.4 cm-1, F(000) = 608, room temperature, final R = 0.028 for the 989 observed reflections with I > 3-sigma(I) from 1540 independent reflections. There are two formula units in the asymmetric unit. The geometries of the two molecules are very similar. Rings are planar within 0.006 angstrom. All H atoms take part in hydrogen bonds. RP CROMER, DT (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MSC346,INC-4,LOS ALAMOS,NM 87545, USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD NOV 15 PY 1991 VL 47 BP 2476 EP 2478 DI 10.1107/S0108270191003761 PN 11 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GR136 UT WOS:A1991GR13600079 ER PT J AU DIACK, M GUIOCHON, G AF DIACK, M GUIOCHON, G TI ADSORPTION-ISOTHERM AND OVERLOADED ELUTION PROFILES OF PHENYLDODECANE ON POROUS CARBON IN LIQUID-CHROMATOGRAPHY SO ANALYTICAL CHEMISTRY LA English DT Article ID THEORETICAL BAND PROFILES; MOBILE PHASE; SOLID CHROMATOGRAPHY; RETENTION DATA; PERFORMANCE; PROPAGATION; SIMULATION; MODELS; GAS AB The adsorption isotherm of phenyldodecane from acetonitrile solutions onto porous carbon has been measured at 50-degrees-C, by frontal analysis. This isotherm exhibits two inflexion points. It can be accounted for by the sum of a quadratic and a Langmuir term. The Langmuir term accounts for adsorption at very low surface coverages and could be explained by selective adsorption of the alkyl chains on surface defects. The quadratic term accounts for the adsorbate-adsorbate interactions involving the alkyl groups at moderate degrees of surface coverage. The semiequilibrium model of chromatography permits the calculation of the profiles of high concentration bands when the equilibrium isotherm is known. The model is applied successfully here to the computation of the profiles of bands of increasingly large samples of phenyldodecane. In spite of the complexity of the profiles observed with this sigmoidal isotherm, satisfactory agreement is observed between the experimental profiles and those predicted by theory. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 40 TC 39 Z9 39 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1991 VL 63 IS 22 BP 2608 EP 2613 DI 10.1021/ac00022a014 PG 6 WC Chemistry, Analytical SC Chemistry GA GP581 UT WOS:A1991GP58100014 ER PT J AU HALPERN, MB OBERS, NA AF HALPERN, MB OBERS, NA TI MAGIC BASES, METRIC ANSATZE AND GENERALIZED GRAPH THEORIES IN THE VIRASORO MASTER EQUATION SO ANNALS OF PHYSICS LA English DT Article ID INFINITE-DIMENSIONAL ALGEBRAS; LIE-ALGEBRAS; 2 DIMENSIONS; GAUGE-THEORY; AFFINE-G; MODELS; CONSTRUCTIONS; FERMIONS; REPRESENTATIONS; BOSONIZATION C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP HALPERN, MB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Obers, Niels/0000-0003-4947-8526 NR 45 TC 4 Z9 4 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD NOV 15 PY 1991 VL 212 IS 1 BP 28 EP 52 DI 10.1016/0003-4916(91)90371-E PG 25 WC Physics, Multidisciplinary SC Physics GA GP565 UT WOS:A1991GP56500002 ER PT J AU YING, H LIU, HL SOANE, DS PRAUSNITZ, JM AF YING, H LIU, HL SOANE, DS PRAUSNITZ, JM TI BINARY-LIQUID LIQUID EQUILIBRIA FROM A DOUBLE-LATTICE MODEL SO FLUID PHASE EQUILIBRIA LA English DT Article ID MULTICOMPONENT POLYMER SYSTEMS; PHASE-SEPARATION; CRITICAL REGION; TRANSFORMATION; THERMODYNAMICS AB Freed's lattice field theory is used to establish a double-lattice model for the Helmholtz energy of mixing for strongly non-ideal binary liquid mixtures. The coefficients of Freed's expansion terms are adjusted such that the calculated coexistence curve for the simple Ising lattice is in excellent agreement with that calculated from the Pade-approximant coefficients for spontaneous magnetization proposed by Scesney. For a variety of binary systems, two parameters (epsilon/k and r2) are obtained from experimental critical consolute points; here epsilon/k is the interchange energy and r2 is the number of lattice sites required by molecule 2, with r1 = 1. Calculated coexistence curves are generally in good agreement with experiment for fluid mixtures without specific (oriented) interactions, much better than those calculated using Flory-Huggins theory, especially near critical consolute points. Introducing a secondary lattice to account for highly oriented interactions (hydrogen bonding), requires an additional energy parameter delta-epsilon/k and an empirical parameter c10. With these parameters coexistence curves are fitted well for systems having a miscibility loop with both lower and upper critical solution temperatures. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP YING, H (reprint author), E CHINA INST CHEM TECHNOL, THERMODYNAM RES LAB, SHANGHAI, PEOPLES R CHINA. NR 28 TC 0 Z9 1 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 EI 1879-0224 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD NOV 15 PY 1991 VL 67 BP 65 EP 86 PG 22 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA GQ999 UT WOS:A1991GQ99900006 ER PT J AU STOJIMIROVIC, A AF STOJIMIROVIC, A TI ENERGY CHANGES ASSOCIATED WITH ACTIVE ZONE PROPAGATION SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article RP STOJIMIROVIC, A (reprint author), ARGONNE NATL LAB,MCT 212,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0376-9429 J9 INT J FRACTURE JI Int. J. Fract. PD NOV 15 PY 1991 VL 52 IS 2 BP R31 EP R34 PG 4 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA GW335 UT WOS:A1991GW33500007 ER PT J AU HARVEY, EC HOOKER, CJ KEY, MH KIDD, AK LISTER, JMD SHAW, MJ LELAND, WT AF HARVEY, EC HOOKER, CJ KEY, MH KIDD, AK LISTER, JMD SHAW, MJ LELAND, WT TI PICOSECOND GAIN AND SATURATION MEASUREMENTS IN A KRF LASER-AMPLIFIER DEPUMPED BY AMPLIFIED SPONTANEOUS EMISSION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID NONSATURABLE ABSORPTION; AMPLIFICATION; SPRITE AB The input/output characteristic of a large aperture (270-mm diam) electron-beam-pumped KrF laser amplifier is obtained for pulses of 6- and 40-ps duration. The off-resonance absorption coefficient is estimated by measurement of loss at 268 nm. The gain-to-loss ratio is found to decrease from 8 to 6 as the specific pump rate is increased from 0.3 to 0.65 MW cm-3. Gain depumping due to amplified spontaneous emission (ASE) is treated by a simple 1D code and found to give good agreement with experiment. A 3D code incorporating wall reflections gives even better agreement. The spatial distribution of gain and ASE is recorded using visible and ultraviolet imaging. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP HARVEY, EC (reprint author), RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. NR 26 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5238 EP 5245 DI 10.1063/1.350233 PN 1 PG 8 WC Physics, Applied SC Physics GA GQ943 UT WOS:A1991GQ94300010 ER PT J AU SELA, I CAMPBELL, IH LAURICH, BK SMITH, DL SAMOSKA, LA BOLOGNESI, CR GOSSARD, AC KROEMER, H AF SELA, I CAMPBELL, IH LAURICH, BK SMITH, DL SAMOSKA, LA BOLOGNESI, CR GOSSARD, AC KROEMER, H TI RAMAN-SCATTERING STUDY OF INAS/GAINSB STRAINED LAYER SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INFRARED DETECTORS; GASB; INAS; INTERFACE; GAP AB We present a Raman scattering study of the InAs/GaInSb superlattice. This new superlattice is promising as a long wavelength infrared detector material. The samples were grown by molecular beam epitaxy and their structural parameters were determined by Rutherford backscattering and x-ray diffraction. Samples were grown on [001] GaAs substrates with GaSb buffers, and directly on [001] GaSb substrates. Cross-sectional transmission electron micrographs show that for the samples grown on GaAs substrates, a high density of dislocations was generated at the GaAs-GaSb interface, and many of these dislocations thread through the superlattice. The samples grown directly on GaSb had a much lower dislocation density. The Raman spectra of the InAs/GaInSb superlattice shows a single peak, which is a superposition of scattering from the LO phonons in InAs and in GaInSb. For unstrained InAs and GaInSb, the LO phonon energies are sufficiently separated that they would be well resolved in Raman scattering. However, the strain introduced into these materials by the pseudomorphic boundary conditions moves the two phonons closer together energetically so that only one peak is seen in the Raman spectrum of the superlattice. A high energy Raman scattering tail is seen in some of the samples. This tail is from Ga-As local modes. Such modes may be due to As incorporation in the GaInSb, Ga incorporation in the InAs or phase mixing at the interfaces. C1 UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT ENGN MAT,SANTA BARBARA,CA 93106. RP SELA, I (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 20 TC 17 Z9 17 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5608 EP 5614 DI 10.1063/1.350174 PN 1 PG 7 WC Physics, Applied SC Physics GA GQ943 UT WOS:A1991GQ94300057 ER PT J AU NELSON, AJ FRIGO, S MANCINI, D ROSENBERG, R AF NELSON, AJ FRIGO, S MANCINI, D ROSENBERG, R TI PHOTOEMISSION CHARACTERIZATION OF THE H-2 PLASMA ETCHED SURFACE OF INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CYCLOTRON RESONANCE DISCHARGES; ETCHING INDUCED DAMAGE; GAAS; INGAAS; CH4/H2/AR; HYDROGEN AB Synchrotron radiation soft x-ray photoemission spectroscopy was used to characterize the surface chemistry of InP before and after exposure to a H-2 plasma. The low-power H-2 plasma was generated with a commercial electron cyclotron resonance plasma source using a mixture of H-2 and Ar with the plasma exposure being performed at ambient temperature. Plasma species were identified with quadrupole based mass spectrometry and optical emission spectroscopy. Photoemission measurements were acquired after each plasma exposure in order to observe changes in the valence-band electronic structure as well as changes in the In 4d and P 2p core lines. The results were correlated in order to relate the plasma species and characteristics to changes in surface chemistry. C1 UNIV WISCONSIN MADISON,SYNCHROTRON RADIAT CTR,STOUGHTON,WI 53589. RP NELSON, AJ (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. RI Schaff, William/B-5839-2009; Rosenberg, Richard/K-3442-2012 NR 24 TC 17 Z9 17 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5619 EP 5622 DI 10.1063/1.350176 PN 1 PG 4 WC Physics, Applied SC Physics GA GQ943 UT WOS:A1991GQ94300059 ER PT J AU RUCKMAN, MW HEPP, AF AF RUCKMAN, MW HEPP, AF TI NEAR-EDGE STUDY OF GOLD-SUBSTITUTED YBA2CU3O7-DELTA SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID BA-CU-O; HIGH-TC SUPERCONDUCTORS; VALENCE; YBA2(CU1-XFEX)3O7-DELTA AB The valence of Cu and Au in YBa2Au0.3Cu2.7O7-delta was investigated using x-ray absorption near-edge structure (XANES). X-ray and neutron diffraction studies indicate that Au goes on the Cu(1) site and Cu K-edge XANES shows that this has little effect on the oxidation state of the remaining copper. The Au L3 edge develops a white line feature whose position lies between that of trivalent gold oxide (Au2O3) and monovalent potassium gold cyanide (KAu(CN)2) and whose height relative to the edge step is smaller than in the two reference compounds. The appearance of the Au L3 edge suggests that fewer Au 3d states are involved in forming the Au-O bond in YBa2Au0.3Cu2.7O7-delta than in trivalent gold oxide. C1 NASA,LEWIS RES CTR,DIV POWER TECHNOL,CLEVELAND,OH 44135. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 26 TC 4 Z9 4 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5713 EP 5715 DI 10.1063/1.350166 PN 1 PG 3 WC Physics, Applied SC Physics GA GQ943 UT WOS:A1991GQ94300078 ER PT J AU LIU, L KOUVEL, JS BRUN, TO AF LIU, L KOUVEL, JS BRUN, TO TI VORTEX-FLUX ROTATION IN POLYCRYSTALLINE YBA2CU3O7 AT 77-K SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID MAGNETIC PROCESSES; SUPERCONDUCTOR; CREEP AB Magnetization-vector measurements at 77 K on a field-cooled sample rotated by angle-theta relative to fixed field H reveal that M(p), the penetrating vortex-flux component of the magnetization, undergoes some extraordinary changes at H almost-equal-to 30 Oe. As theta is raised above 180-degrees, M(p) decreases in size to a very small minimum while its direction shifts rapidly, and these changes repeat as theta is then lowered below 180-degrees. This behavior, which evolves systematically with H, was observed earlier for the same sample at 4.2 K but at much higher H (approximately 800 Oe) and is readily ascribed to a broad distribution in strength of the vortex pinning forces. Due to this distribution, the vortex lines bifurcate into two groups, one of which rotates rigidly with the sample while the other is held by H and turns frictionally relative to the sample. C1 UNIV CALIF LOS ALAMOS SCI LAB,P-LANSCE,LOS ALAMOS,NM 87545. RP LIU, L (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680, USA. NR 9 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5733 EP 5735 DI 10.1063/1.350168 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500002 ER PT J AU HEFFNER, RH OTT, HR SCHENCK, A MYDOSH, JA MACLAUGHLIN, DE AF HEFFNER, RH OTT, HR SCHENCK, A MYDOSH, JA MACLAUGHLIN, DE TI CONNECTIONS BETWEEN MAGNETISM AND SUPERCONDUCTIVITY IN UBE13 DOPED WITH THORIUM OR BORON (INVITED) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID PHASE-DIAGRAM; U1-XTHXBE13; STATES AB Magnetism and superconductivity appear to be intimately connected in the heavy electron (HE) superconductors. For example, it has been conjectured but not proven that the exchange of antiferromagnetic spin fluctuations are responsible for pairing in HE superconductors. In this paper we review recent results in U1-xThxBe13, where specific heat, lower critical field, and zero-field muon-spin-resonance (mu-SR) measurements reveal another second-order phase transition (below the superconducting transition) to a state which possesses small-moment magnetic correlations for 0.019 less-than-or-equal-to x less-than-or-equal-to 0.043. We present a new phase diagram for (U,Th)Be13 which indicates that the superconducting and magnetic order parameters are closely coupled. A discussion of the nature of the lower phase is presented, including the consideration of a possible magnetic (time-reversal-violating) superconducting state. When UBe13 is doped with B (UBe12.97B0.03) the Kondo temperature is decreased and the specific heat jump at the superconducting transition temperature is significantly enhanced. However, mu-SR measurements reveal no magnetic signature in UBe12.97B0.03, unlike the case for Th doping. The correlation between changes in the Kondo temperature and changes in the superconducting properties induced by B doping provide evidence for the importance of magnetic excitations in the superconducting pairing interaction in UBe13. C1 PAUL SCHERRER INST,ETH ZURICH,CH-5232 VILLIGEN,SWITZERLAND. KAMERLINGH ONNES LAB,2300 RA LEIDEN,NETHERLANDS. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. RP HEFFNER, RH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5782 EP 5787 DI 10.1063/1.350160 PN 2 PG 6 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500019 ER PT J AU LUKE, GM LE, LP STERNLIEB, BJ WU, WD UEMURA, YJ DALICHAOUCH, Y LEE, BW MAPLE, MB SEAMAN, CL ARMSTRONG, PE ELLIS, RW FISK, Z AF LUKE, GM LE, LP STERNLIEB, BJ WU, WD UEMURA, YJ DALICHAOUCH, Y LEE, BW MAPLE, MB SEAMAN, CL ARMSTRONG, PE ELLIS, RW FISK, Z TI MUON SPIN RELAXATION IN THE HEAVY FERMION SYSTEM UPT3 SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID FIELD PENETRATION DEPTH; SUPERCONDUCTOR UPT3; PHASE-DIAGRAM; UBE13; STATES AB We report muon spin rotation/relaxation (mu-SR) measurements of the heavy fermion superconductor UPt3 in external fields H(ext) parallel-to c. We find that the muon Knight shift is unchanged in the superconducting state, consistent with odd-parity pairing (such as p wave). The transverse field relaxation is observed to be strongly field dependent, decreasing with increasing field. Below T(c) the increase is barely detectable in an applied field of 4 kG parallel-to c. On the basis of the high field measurements, we estimate the low temperature penetration depth to be lambda(T --> 0) greater-than-or-equal-to 11 000 angstrom. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP LUKE, GM (reprint author), COLUMBIA UNIV,DEPT PHYS,538 W 120TH ST,NEW YORK,NY 10027, USA. RI Luke, Graeme/A-9094-2010; OI Luke, Graeme/0000-0003-4762-1173 NR 21 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5788 EP 5790 DI 10.1063/1.350161 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500020 ER PT J AU CANFIELD, PC THOMPSON, JD BEYERMANN, WP LACERDA, A HUNDLEY, MF PETERSON, E FISK, Z OTT, HR AF CANFIELD, PC THOMPSON, JD BEYERMANN, WP LACERDA, A HUNDLEY, MF PETERSON, E FISK, Z OTT, HR TI MAGNETISM AND HEAVY FERMION-LIKE BEHAVIOR IN THE RBIPT SERIES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB Members of the RBiPt (R = Ce-Lu with the exceptions of Pm and Eu) series have been grown as single crystals. Magnetic susceptibility and electrical resistance have been measured on all members of the series, and specific heat measurements have been performed on representatives. The high temperature resistance uniformly changes from that of a small-gap semiconductor or semimetal seen in NdBiPt to that of a heavy-fermion metal seen in YbBiPt, which shows a linear coefficient of specific heat at low temperatures of 8 J/K2 mole. Further, the lighter rare earth members show an unusually sharp increase in their resistance associated with antiferromagnetic ordering at low temperatures. C1 SWISS FED INST TECHNOL,CH-8006 ZURICH,SWITZERLAND. RP CANFIELD, PC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 7 TC 103 Z9 103 U1 4 U2 28 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5800 EP 5802 DI 10.1063/1.350141 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500024 ER PT J AU SANCHEZCASTRO, C COOPER, BR AF SANCHEZCASTRO, C COOPER, BR TI THE EFFECT OF A PARASITE HYBRIDIZER ON THE MAGNETIC-BEHAVIOR OF PARTIALLY DELOCALIZED TRANSITION SHELL SYSTEMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP SANCHEZCASTRO, C (reprint author), W VIRGINIA UNIV,DEPT PHYS,MORGANTOWN,WV 26506, 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5812 EP 5812 DI 10.1063/1.350119 PN 2 PG 1 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500028 ER PT J AU SINKOVIC, B JOHNSON, PD BROOKES, NB CLARKE, A SMITH, NV AF SINKOVIC, B JOHNSON, PD BROOKES, NB CLARKE, A SMITH, NV TI SPIN-POLARIZED CORE-LEVEL PHOTOEMISSION OF OXIDIZED FE(001)(INVITED) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID INITIAL-OXIDATION; FE(100); OXYGEN; SPECTROSCOPY; SURFACES; SPECTRA; IRON; XPS AB The combination of spin-polarization detection with core-level photoemission to give spin-polarized electron spectroscopy for chemical analysis provides new information on the oxidation of an iron surface. During the initial stage of oxidation the predominant phase is of a ferrimagnetic gamma-Fe2O3 form. The observed antiferromagnetic coupling of this oxide with the iron substrate is attributed to the superexchange interaction mediated by an oxygen ion. This provides evidence for a site exchange mechanism during the initial oxidation. Annealing transforms this oxide into an antiferromagnetic Fe(x)O form which is also present at the initial stage. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP SINKOVIC, B (reprint author), NYU,DEPT PHYS,2 WASHINGTON PL,NEW YORK,NY 10003, USA. NR 20 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5918 EP 5922 DI 10.1063/1.350106 PN 2 PG 5 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500069 ER PT J AU PASTERNAK, MP TAYLOR, RD JEANLOZ, R AF PASTERNAK, MP TAYLOR, RD JEANLOZ, R TI PRESSURE-INDUCED MOTT TRANSITION IN TRANSITION-METAL IODIDES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID MOSSBAUER-SPECTROSCOPY; NII2 AB Many of the transition-metal (TM) compounds, because of exchange and correlation interactions within the narrow and poorly overlapping d bands, become antiferromagnetic insulators, the Mott insulators (MI). The properties of the MI and their gradual transition into the noncorrelated metallic state (the Mott transition) are of crucial importance for the elucidation of high-temperature superconducting materials features in particular and to magnetism in general. The transition of the MI into a metal can be achieved either by doping or by high pressure. The first method is definitely inappropriate for studying the nature of the Mott transition; for the narrow-band materials the electronic and structural disorder inherent in doping has a strongly perturbing effect. To yield the definitive data on the Mott transition, high-pressure work on well-characterized materials should be sought. The present studies provide for the first time extensive information on the Mott-Hubbard gap closure induced by high pressure. High-pressure studies using diamond anvil cells were conducted with several (TM)I2 compounds. They all have layered structures and order antiferromagnetically at ambient pressure. I-129 Mossbauer spectroscopy (MS) was used to study the properties of the (TM)2+ sublattice magnetization as a function of pressure and temperature, and x-ray diffraction was used to look for possible crystallographic transitions and to obtain the equation of state. Results show that the high-pressure transition at P(c) from a magnetic to a nonmagnetic state is not accompanied by crystallographic changes. Previous studies [M. P. Pasternak et al., Phys. Rev. Lett. 65, 790 (1990)] with NiI2 have confirmed the presence of a metallic state at P > P(c). Inherent to the pressure behavior of the magnetic state is the gradual increase of T(N) in all cases and a slight increase in the TM2+ moments with pressure increase. The collapse of the magnetic state is abrupt for some cases (NiI2) and gradual for others (CoI2), indicative of different band-overlap mechanisms. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545. UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. RP PASTERNAK, MP (reprint author), TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. NR 21 TC 10 Z9 10 U1 2 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5956 EP 5960 DI 10.1063/1.350089 PN 2 PG 5 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500080 ER PT J AU LOEWENHAUPT, M SOSNOWSKA I AF LOEWENHAUPT, M SOSNOWSKA, I TI EXCHANGE AND CRYSTAL FIELDS IN R2FE14B STUDIED BY INELASTIC NEUTRON-SCATTERING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MAGNETIZATION MEASUREMENTS; MOSSBAUER; ND2FE14B; GD2FE14B; ION AB Exchange and crystal fields (CF) acting on R3+ ions in R2Fe14B were investigated by means of inelastic magnetic neutron scattering. Experimental data for R = Pr, Nd, Gd, Tb, Dy, Ho, Er, and Tm are reviewed. Molecular fields H acting on R ions are calculated using neutron-scattering data for the CF models proposed earlier for these compounds based on single-crystal magnetization measurements. For Gd2Fe14B the molecular field acting on the Gd3+ ions was directly determined by inelastic neutron scattering as 2-mu(B)H(m)/k(B) = 435 K. C1 ARGONNE NATL LAB, MSD, ARGONNE, IL 60439 USA. UNIV WARSAW, INST EXPTL PHYS, PL-00681 WARSAW, POLAND. RP LOEWENHAUPT, M (reprint author), FORSCHUNGSZENTRUM JULICH, FORSCHUNGZENTRUM, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY. RI Sosnowska, Izabela/O-6184-2014 NR 15 TC 19 Z9 19 U1 2 U2 7 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5967 EP 5971 DI 10.1063/1.350091 PG 5 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500082 ER PT J AU CANFIELD, PC THOMPSON, JD FISK, Z AF CANFIELD, PC THOMPSON, JD FISK, Z TI NOVEL CE MAGNETISM IN CEDIPNICTIDE AND DI-CE PNICTIDE STRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB Results of electrical resistance and magnetic susceptibility measurements on Ce2Bi, Ce2Sb, CeScGe, CeScSi and CeSb2 are presented. Ce2Bi and Ce2Sb have antiferromagnetic transitions at low temperatures, while CeSb2, CeScGe and CeScSi have ferromagnetic transitions, CeScGe having a T(c) = 46 K. The data are analyzed with respect to the similarities of the two crystals structure groups that these materials fall into: CeSb2 having the LaSb2 structure and the other materials all having the La2Sb structure. RP CANFIELD, PC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 5 TC 38 Z9 38 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5992 EP 5994 DI 10.1063/1.350071 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500088 ER PT J AU HUTTEN, A THOMAS, G AF HUTTEN, A THOMAS, G TI COERCIVITY MECHANISM IN SMFETI RARE-EARTH MAGNETS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID THMN12 STRUCTURE AB The microstructure of SmFeTi magnets has been investigated by electron microscopy and microanalysis. Melt-spun SmFe10Ti consist of two phases; the hard magnetic SmFe11Ti phase (1:12), with the ThMn12 structure, and alpha-Fe. The origin of the Fe formation and its influence on the magnetic behavior are discussed. The measured temperature dependence of the coercivity is analyzed in terms of nucleation and pinning mechanisms. It is concluded that both models describe reasonably the temperature dependence of the coercivity in the temperature range 300-500 K, namely that the pinning mechanism predominates at higher temperatures, and the nucleation mechanism at lower temperatures. The microstructure of mechanically alloyed Sm28Fe62Ti10 consists of multiphases. The magnetic properties in these specimens are not determined by the (1:12) phase but a new hard magnetic Sm23Fe73Ti4 phase. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP HUTTEN, A (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. RI Hutten, Andreas/B-3524-2011 NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6113 EP 6115 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500129 ER PT J AU MALEY, MP AF MALEY, MP TI OVERVIEW OF THE STATUS OF AND PROSPECTS FOR HIGH-TC WIRE AND TAPE DEVELOPMENT SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID BA-CU-O; HIGH-TEMPERATURE SUPERCONDUCTORS; CRITICAL CURRENT DENSITIES; THIN-FILMS; IRREVERSIBILITY LINE; LASER DEPOSITION; BI2SR2CACU2O8; ANISOTROPY; YBA2CU3O7; CRYSTAL AB Recent world-wide progress in the effort to develop long continuous lengths of conductor based on high-T(c) materials with high critical currents in substantial magnetic fields offers promise for a variety of applications. Two major problems, weak links and weak flux pinning, have plagued conductor development efforts from the beginning. Recent advances in mechanical processing of tape conductors based on BSCCO show great promise in overcoming weak links, with low-temperature J(c) values > 10(5) A/cm2 extending to magnetic fields > 25 T. Unfortunately, these materials continue to exhibit weak flux pinning at moderate temperatures for magnetic fields aligned along the crystalline c axis. This manifests itself in a J(c) that declines precipitously with magnetic field for T > 30 K. By contrast, conductors based on YBCO exhibit much stronger pinning at high temperature with smaller sensitivity to magnetic field orientation, but remain severely limited by weak links. The poor performance of BSCCO- and TBCCO-based materials appears to be strongly correlated with the high degree of intrinsic anisotropy. Phenomenological models describing this behavior and prospects for further progress are examined. RP MALEY, MP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. NR 37 TC 34 Z9 34 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6189 EP 6193 DI 10.1063/1.349989 PN 2 PG 5 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500157 ER PT J AU COFFEY, D AF COFFEY, D TI INVESTIGATION OF A HAMILTONIAN WITH 2 SOURCES OF ANISOTROPY - THE DZYALOSHINSKII-MORIYA AND SINGLE-SITE INTERACTIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID LA2CUO4 AB La2CuO4 is an S = 1/2 system with almost tetragonal symmetry so that there is no single-site interaction term giving rise to anisotropy and the magnetic anisotropy of the system can be explained in terms of the Dzyaloshinskii-Moriya interaction which can lead to weak ferromagnetism even in a system with predominantly antiferromagnetic interactions. However, the closely related compounds, La2NiO4 and La2CoO4, are S = 1 and S = 3/2 systems, respectively, so that a single-site interaction term is present and it is of interest to see how this interaction changes the magnetic properties of these compounds. Here the classical magnetic ground states are calculated for model Hamiltonians, appropriate to the different low-temperature structural phases of the compounds, containing both interactions. RP COFFEY, D (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 17 TC 1 Z9 1 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6326 EP 6328 DI 10.1063/1.349957 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500206 ER PT J AU NAZIRIPOUR, A DONG, C DREXLER, JW SWARTZLANDER, AB NELSON, AJ HERMANN, AM AF NAZIRIPOUR, A DONG, C DREXLER, JW SWARTZLANDER, AB NELSON, AJ HERMANN, AM TI TL-BA-CA-CU-O SUPERCONDUCTING THIN-FILMS WITH POSTDEPOSITION PROCESSING USING TL-CONTAINING THIN-FILMS AS TL SOURCE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB We describe a new method of processing Tl-Ba-Ca-Cu-O (TBCCO) superconducting thin films. In this method, two identical elemental multilayer films containing Tl layers were prepared using an electron-beam deposition technique. The thin-film samples were then placed in face-to-face contact in a quartz crucible and heat treated at 740-degrees-C for 10 min in flowing air. The x-ray microanalysis of the bottom sample indicates promising results for obtaining the desired chemical composition. Random characterization from different sections of the sample showed that the microanalysis values had less scatter than those for samples prepared using the usual bulk postdeposition method. The average chemical composition of the 13 points obtained from the random section is Tl1.8Ba1.8Ca1.9Cu2.0Ox. However, oxygen analysis showed that the concentration of oxygen is low and poorly distributed, presumeably attributable to the low oxygen flow. This method has several advantages over the conventional Tl-O vapor processing using pure metallic thallium, thallium oxide or bulk TBCCO. These advantages include: (a) increase in uniformity of thallium deposition, (b) safer processing as a result of a smaller release of thallium, and (c) reduction of processing cost. C1 UNIV COLORADO,DEPT GEOL SCI,BOULDER,CO 80309. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP NAZIRIPOUR, A (reprint author), UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6495 EP 6497 DI 10.1063/1.349886 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500265 ER PT J AU CHA, YS HULL, JR MULCAHY, TM ROSSING, TD AF CHA, YS HULL, JR MULCAHY, TM ROSSING, TD TI EFFECT OF SIZE AND GEOMETRY ON LEVITATION FORCE MEASUREMENTS BETWEEN PERMANENT-MAGNETS AND HIGH-TEMPERATURE SUPERCONDUCTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB A series of experiments measuring the levitation force between a permanent magnet (PM) and a high-temperature superconductor (HTS) and between pairs of PMs, coupled with finite-element calculations of the forces and fields, has identified factors that influence the levitation force. The self-demagnetizing factor within the HTS and, to some extent, within the PM has a profound effect on magnetic pressure. For large HTSs with strong flux-pinning, the demagnetizing effect of the diamagnetic image of the PM is substantial. For short distances between the HTS and PM, compression of magnetic flux produces a dependence on PM diameter. C1 NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP CHA, YS (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 7 TC 19 Z9 20 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6504 EP 6506 DI 10.1063/1.349889 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500268 ER PT J AU ROSSING, TD KORTE, R HULL, JR AF ROSSING, TD KORTE, R HULL, JR TI EFFECT OF GUIDEWAY DISCONTINUITIES ON MAGNETIC-LEVITATION AND DRAG FORCES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB Transients in the lift and drag forces on a NdFeB permanent magnet were observed as the magnet passed over various discontinuities in a rotating aluminum disk at velocities of 4 to 25 m/s. For full cuts in the disk, the amplitude of the lift and drag transients and the wave form of the drag transient depend on the width, and the amplitudes are much larger than for partial cuts. The use of a backing plate to join two cut segments is ineffective. C1 NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP ROSSING, TD (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 2 TC 1 Z9 1 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6507 EP 6509 DI 10.1063/1.350370 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500269 ER PT J AU LESSURE, HS SIMIZU, S SANKAR, SG MCHENRY, ME COST, JR MALEY, MP AF LESSURE, HS SIMIZU, S SANKAR, SG MCHENRY, ME COST, JR MALEY, MP TI CRITICAL CURRENT-DENSITY AND FLUX PINNING DOMINATED BY NEUTRON-IRRADIATION INDUCED DEFECTS IN YBA2CU3O7-X SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID MAGNETIZATION AB The functional dependence of critical current density (J(c)) upon defect density is studied with neutron irradiation of YBa2Cu3O7-x. Identical polycrystalline samples of YBa2Cu3O7-x have been irradiated with fast neutrons (E > 0.1 MeV) in eight steps between 0 and 2.1 x 10(18) n/cm2. Critical current densities are obtained from magnetic hysteresis measurements and correlated with defect density measurements obtained from transmission electron microscopy. We observe that despite the existence of a significant degree of hysteresis in the as grown material the hysteretic J(c) in the irradiated samples appears to be dominated by a power law dependence on neutron fluence with an exponent of approximately 1/3 over a wide range of temperature, field and fluence. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP LESSURE, HS (reprint author), CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213, USA. RI McHenry, Michael/B-8936-2009 NR 13 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6513 EP 6515 DI 10.1063/1.349891 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500271 ER PT J AU TONKYN, RG WIEDMANN, R GRANT, ER WHITE, MG AF TONKYN, RG WIEDMANN, R GRANT, ER WHITE, MG TI ROTATIONALLY RESOLVED PHOTOIONIZATION OF H2O SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ELECTRONIC-SPECTRUM; MAGNETIC-RESONANCE; VACUUM ULTRAVIOLET; SPECTROSCOPY; PHOTOELECTRON; RESOLUTION; IONIZATION; MOLECULES; THRESHOLD; STATES AB A rotationally resolved one-photon threshold photoionization spectrum of jet-cooled water (H2O and D2O) has been obtained by pulsed field ionization of extremely high-n Rydberg states. Observed spectral intensities for both vibrationless (0,0,0) and vibrationally excited (1,0,0) water cation show a strong propensity for DELTA-N = 0, +/- 1 transitions. In contrast to earlier work on O2 and HCl, the lack of large DELTA-N transitions suggests that ionization occurs with only small angular momentum transfers between the core and photoelectron. The presence of both type A and type C "symmetric top" transitions varies from the conclusions of a recent MQDT analysis of H2O photoionization, which predicts only type C transitions. Rotational analysis of the spectra yields improved ionization potentials for both H2O and D2O. The ionization potential of the (1,0,0) vibrational level provides a direct measurement of the symmetric stretch fundamental in H2O+ which is in excellent agreement with an earlier indirect determination. Room temperature spectra are presented for ionization into the (0,0,0), (0,1,0), and (1,0,0) vibrational levels of H2O+. C1 PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. RP TONKYN, RG (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 30 TC 89 Z9 89 U1 0 U2 13 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7033 EP 7040 DI 10.1063/1.461431 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300001 ER PT J AU GRAY, JA FARROW, RL AF GRAY, JA FARROW, RL TI PREDISSOCIATION LIFETIMES OF OH A2-SIGMA+ (V'=3) OBTAINED FROM OPTICAL OPTICAL DOUBLE-RESONANCE LINEWIDTH MEASUREMENTS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LASER-INDUCED FLUORESCENCE; ROTATIONAL ENERGY-TRANSFER; ATOMIC-HYDROGEN; A2SIGMA+ STATE; OD; PROBABILITIES; FLAMES AB The excitation of rapidly predissociating upsilon' = 3 levels in the A2-SIGMA+ state of OH has recently been suggested as a means of avoiding collisional quenching corrections when performing laser-induced fluorescence (LIF) measurements in flames. We report measurements of predissociation rates of several rotational levels in upsilon' = 3, obtained from linewidths in optical-optical double-resonance (OODR) spectra. The magnitude of the observed predissociation rates places an upper limit on the pressures at which OH LIF can be considered "quench-free." In addition, analysis of spectral line shapes suggests that rotational transfer can significantly affect LIF quantum yields at pressures of 1 atm and higher. We conclude that variations of the predissociation rate with rotational level in upsilon' = 3 must be included in determinations of rotational temperatures from LIF. RP GRAY, JA (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 30 TC 65 Z9 65 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7054 EP 7060 DI 10.1063/1.461433 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300003 ER PT J AU CHANG, BC YU, L CULLIN, D REHFUSS, B WILLIAMSON, J MILLER, TA FAWZY, WM ZHENG, X FEI, S HEAVEN, M AF CHANG, BC YU, L CULLIN, D REHFUSS, B WILLIAMSON, J MILLER, TA FAWZY, WM ZHENG, X FEI, S HEAVEN, M TI ROTATIONAL, FINE, AND HYPERFINE-STRUCTURE IN THE HIGH-RESOLUTION ELECTRONIC-SPECTRUM OF AROH AND AROD SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID OXIDE VANDERWAALS MOLECULES; OH-AR; VIBRATIONAL PREDISSOCIATION; ENERGY-LEVELS; NITRIC-OXIDE; FLUORESCENCE; SPECTROSCOPY; COMPLEXES; DYNAMICS; SURFACE AB A number of vibrational bands of the approximately A 2-SIGMA+ <--> approximately X 2-PI electronic spectrum of both ArOH and ArOD have been investigated by laser induced fluorescence with a high-resolution, pulsed laser system yielding linewidths less-than-or-similar-to 250 MHz in the UV. This spectrum not only displays completely resolved rotational structure, but also fine and hyperfine structure. The hyperfine constants and precise interatomic distances derived from the rotational constants provide a very interesting picture of the electronic and geometric structure of the complex. The bonding is incipiently chemical in the approximately A state with clear evidence for at least some electronic reorganization between Ar and the open-shell OH radical in the complex. Conversely, the approximately X state appears to be bound almost solely by physical van der Waals interactions characteristic of systems containing only closed-shell species. C1 BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. EMORY UNIV, DEPT CHEM, ATLANTA, GA 30322 USA. RP OHIO STATE UNIV, DEPT CHEM, LASER SPECT FACIL, COLUMBUS, OH 43210 USA. RI Miller, Terry/F-6607-2014 OI Miller, Terry/0000-0003-0731-8006 NR 36 TC 70 Z9 70 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7086 EP 7098 DI 10.1063/1.461437 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300007 ER PT J AU CARNALL, WT LIU, GK WILLIAMS, CW REID, MF AF CARNALL, WT LIU, GK WILLIAMS, CW REID, MF TI ANALYSIS OF THE CRYSTAL-FIELD SPECTRA OF THE ACTINIDE TETRAFLUORIDES .1. UF4, NPF4, AND PUF4 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SUPERPOSITION-MODEL; IONS AB An interpretation of the low-temperature absorption spectra of AnF4 (An = U, Np, Pu) is presented. Using an effective operator Hamiltonian with orthogonalized free-ion operators and initializing crystal-field parameter values based on a superposition model calculation for An4+ sites with C2 symmetry, good agreement between the model calculations and experimentally observed absorption band structure could be obtained. Correlations with published magnetic and heat capacity measurements are discussed. C1 UNIV HONG KONG,DEPT PHYS,HONG KONG,HONG KONG. RP CARNALL, WT (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 28 TC 67 Z9 67 U1 2 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7194 EP 7203 DI 10.1063/1.461396 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300018 ER PT J AU ONEIL, MP WASIELEWSKI, MR KHALED, MM KISPERT, LD AF ONEIL, MP WASIELEWSKI, MR KHALED, MM KISPERT, LD TI SOLVENT AND TEMPERATURE-DEPENDENCE OF THE LOWEST EXCITED SINGLET-STATE LIFETIME OF ALL-TRANS-7',7'-DICYANO-7'-APO-BETA-CAROTENE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANS-BETA-CAROTENE; OPTICAL-PROPERTIES; FLUORESCENCE; PHOTOSYNTHESIS; ABSORPTION; POLYENES; SYSTEMS AB The lifetime of the lowest excited singlet state of a highly polarizable polyene, all-trans-7'-7'-dicyano-7'-apo-beta-carotene, 1, was measured as a function of solvent dielectric constant at 295 K and temperature from 7.4-295 K. The polyene was excited in separate experiments with 610 nm, 2 ps, and 450 nm, 4 ps laser pulses. The broad 400-650 nm absorption band of the polyene bleaches immediately upon excitation, while a strong absorption centered between 680-705 nm appears. Both the recovery of the ground state absorption band and the disappearance of the 680-705 nm excited state absorption band exhibit the same single exponential kinetics that depend on both solvent dielectric constant and on temperature. As the dielectric constant of the solvent increases from 1.9 to 36, the lifetime of the lowest excited singlet state of 1 decreases from 11.7 ps to 1.9 ps. As the temperature is lowered the lifetime of the lowest excited singlet state of 1 approaches that observed in low dielectric constant media. The behavior of 1 is ascribed to a large change in dipole moment between the ground and lowest excited singlet state. Interaction of the excited state dipole with solvent dipoles results in enhanced charge transfer character within the excited state, which in turn enhances nonradiative decay of the excited state. The excited state dipole moments of the ground, first, and second excited states of both 1 and beta-8'-apocarotenal, 2 were calculated using the AM1 molecular orbital method. The calculations predict that 1 has a 5.1 Debye difference in dipole moment between the ground and first excited state. C1 UNIV ALABAMA,DEPT CHEM,TUSCALOOSA,AL 35487. RP ONEIL, MP (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 29 TC 35 Z9 35 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7212 EP 7218 DI 10.1063/1.461398 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300020 ER PT J AU KOCH, H HARRISON, RJ AF KOCH, H HARRISON, RJ TI ANALYTICAL CALCULATION OF FULL CONFIGURATION-INTERACTION RESPONSE PROPERTIES - APPLICATION TO BE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MULTICONFIGURATIONAL LINEAR RESPONSE; FIELD WAVE-FUNCTIONS; GAUSSIAN-BASIS SETS; EXCITATION-ENERGIES; MOLECULAR CALCULATIONS; POLARIZABILITIES; STATE; HYDROGEN; MOTION; ATOMS AB The computation of the frequency dependent linear and quadratic response functions is formulated at the full configuration interaction (FCI) level of theory. It is demonstrated that the frequency dependent polarizability (for real and imaginary frequencies) may be obtained with quadratic dependence on the error in the solution of the response equations. An efficient solution of the FCI response equations for large imaginary frequencies is developed. Initial application is to the Be atom in the standard 9s9p5d basis. Reported results include transition energies and dipole moments for the first few singlet and triplet S, P, and D states, the first polarizability at real and imaginary frequencies, the C6 coefficient, and the static second hyperpolarizability. Comparison to prior theoretical results in this basis, and to experiment, is made where possible. It is the first time that many of these properties have been computed at the FCI level of theory for any system. RP KOCH, H (reprint author), ARGONNE NATL LAB,DEPT CHEM,THEORET PHYS GRP,ARGONNE,IL 60439, USA. RI Koch, Henrik/J-2537-2012 NR 31 TC 46 Z9 46 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7479 EP 7485 DI 10.1063/1.461373 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300048 ER PT J AU CHOI, YM REE, T REE, FH AF CHOI, YM REE, T REE, FH TI HARD-SPHERE RADIAL-DISTRIBUTION FUNCTIONS FOR FACE-CENTERED CUBIC AND HEXAGONAL CLOSE-PACKED PHASES - REPRESENTATION AND USE IN A SOLID-STATE PERTURBATION-THEORY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID INVERSE POWER POTENTIALS; LENNARD-JONES SYSTEM; THERMODYNAMIC PROPERTIES; MOLECULAR-DYNAMICS; SIMPLE LIQUIDS; MONTE-CARLO; FLUID; TRANSITION; STABILITY; DIAGRAMS AB The hard-sphere radial distribution functions, g(HS) (r/d,eta), for the face-centered cubic and hexagonal close-packed phases have been computed by the Monte Carlo method at nine values of the packing fraction, eta[= (pi/6)rho-d3], ranging from 4% below the melting density to 99% of the close-packed density. The Monte Carlo data are used to improve available analytic expressions for g(HS) (r/d,eta). By utilizing the new g(HS) (r/d,eta) in the Henderson and Grundke method [J. Chem. Phys. 63, 601 (1975)], we next derive an expression for y(HS) (r/d,eta) [ = g(HS) (r/d)exp{beta-V(Hs)(r)}] inside the hard-sphere diameter, d. These expressions are employed in a solid-state perturbation theory [J. Chem. Phys. 84, 4547 (1986)] to compute solid-state and melting properties of the Lennard-Jones and inverse-power potentials. Results are in close agreement with Monte Carlo and lattice-dynamics calculations performed in this and previous work. The new g(HS) (r/d,eta) shows a reasonable thermodynamic consistency as required by the Ornstein-Zernike relation. As an application, we have constructed a high-pressure phase diagram for a truncated Lennard-Jones potential. From this study, we conclude that the new g(HS) (r/d,eta) is an improvement over available expressions and that it is useful for solid-state calculations. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RP KOREA ADV INST SCI & TECHNOL, DEPT CHEM, POB 150, SEOUL 131, SOUTH KOREA. NR 45 TC 66 Z9 67 U1 2 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7548 EP 7561 DI 10.1063/1.461381 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300056 ER PT J AU RICKMAN, JM PHILLPOT, SR AF RICKMAN, JM PHILLPOT, SR TI CALCULATION OF THE ABSOLUTE FREE-ENERGY AND THE ENTROPY OF CLASSICAL SOLIDS FROM THE MOTION OF PARTICLES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS AB It is shown that an analysis of the dynamics of a classical solid's constituent particles can be used to accurately calculate its "absolute" free energy and entropy. We validate the method by calculating the free energy and entropy of a defect-free, Lennard-Jones crystal and then comparing these results with those determined by applying an independent integration method. The relation between this "mechanical" (as opposed to "ensemble") method and other methods is discussed. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Phillpot, Simon/J-9117-2012; OI Phillpot, Simon/0000-0002-7774-6535 NR 14 TC 12 Z9 12 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1991 VL 95 IS 10 BP 7562 EP 7568 DI 10.1063/1.461382 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GN533 UT WOS:A1991GN53300057 ER PT J AU SHANK, JT WHITAKER, JS POLYCHRONAKOS, VA RADEKA, V STEPHANI, D BEKER, H BOCK, RK BOTLO, M FABJAN, CW PFENNIG, J PRICE, MJ WILLIS, WJ AKESSON, T CHERNYATIN, V DOLGOSHEIN, B NEVSKI, P KONSTANTINOV, A POTEKHIN, M ROMANJUK, A SOSNOVTSEV, V GAVRILENKO, I MURAVIEV, S SHMELEVA, A AF SHANK, JT WHITAKER, JS POLYCHRONAKOS, VA RADEKA, V STEPHANI, D BEKER, H BOCK, RK BOTLO, M FABJAN, CW PFENNIG, J PRICE, MJ WILLIS, WJ AKESSON, T CHERNYATIN, V DOLGOSHEIN, B NEVSKI, P KONSTANTINOV, A POTEKHIN, M ROMANJUK, A SOSNOVTSEV, V GAVRILENKO, I MURAVIEV, S SHMELEVA, A TI TEST-BEAM PERFORMANCE OF A TRACKING TRD PROTOTYPE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A tracking transition radiation detector prototype has been constructed and tested. It consists of 192 straw tubes, 4 mm in diameter, embedded in a polyethylene block acting as radiator. Its performance has been studied as an electron identifier as well as a tracking device for minimum-ionizing particles. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CERN,CH-1211 GENEVA 23,SWITZERLAND. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV LUND,S-22101 LUND,SWEDEN. MOSCOW PHYS ENGN INST,MOSCOW,USSR. PN LEBEDEV PHYS INST,MOSCOW,USSR. RP SHANK, JT (reprint author), BOSTON UNIV,BOSTON,MA 02215, USA. RI Shmeleva, Alevtina/M-6199-2015 NR 5 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1991 VL 309 IS 3 BP 377 EP 385 DI 10.1016/0168-9002(91)90241-H PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT824 UT WOS:A1991GT82400003 ER PT J AU ERREDE, D SHEAFF, M FENKER, H LUEKING, L MANTSCH, P JEDICKE, R AF ERREDE, D SHEAFF, M FENKER, H LUEKING, L MANTSCH, P JEDICKE, R TI USE OF A TRANSITION RADIATION DETECTOR IN A BEAM OF HIGH-ENERGY HADRONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PARTICLE IDENTIFICATION AB A transition radiation detector (TRD) comprised of 24 identical radiator plus xenon proportional chamber assemblies was built at Fermilab and operated successfully to separate pions from protons and kaons in a 250 GeV incident hadron beam (gamma(pi) approximately 1800) at rates up to, and sometimes even exceeding, 2 MHz. The detector was capable of identifying pions with efficiencies exceeding 90% and with less-than-or-equal-to 3% contamination due to the nearly equally copious protons and kaons in the beam. C1 FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. UNIV TORONTO, DEPT PHYS, TORONTO M5S 1AT, ONTARIO, CANADA. RP ERREDE, D (reprint author), UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. NR 22 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1991 VL 309 IS 3 BP 386 EP 400 DI 10.1016/0168-9002(91)90242-I PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT824 UT WOS:A1991GT82400004 ER PT J AU SIMONGILLO, J FAROOQ, A RAWOOLSULLIVAN, MW RAY, A SHOEMAKER, J SULLIVAN, JP WOLF, KL BARASCH, EF BOISSEVAIN, JG FOX, D GAVRON, A HOLZSCHEITER, K JACAK, BV LOPEZ, T KAPUSTINSKY, J SONDHEIM, W SUNIER, JW VANHECKE, H WOLF, B AF SIMONGILLO, J FAROOQ, A RAWOOLSULLIVAN, MW RAY, A SHOEMAKER, J SULLIVAN, JP WOLF, KL BARASCH, EF BOISSEVAIN, JG FOX, D GAVRON, A HOLZSCHEITER, K JACAK, BV LOPEZ, T KAPUSTINSKY, J SONDHEIM, W SUNIER, JW VANHECKE, H WOLF, B TI THE DESIGN AND CONSTRUCTION OF A PB SCINTILLATOR SAMPLING CALORIMETER WITH WAVELENGTH SHIFTER FIBER OPTIC READOUT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID URANIUM AB A Pb/scintillator sampling calorimeter covering the pseudorapidity interval of eta = 0.83 to 4.20 has been designed and constructed for Experiment 814 of Brookhaven National Laboratory. The calorimeter uses wavelength shifting optical fibers for readout. Such fibers allow the construction of a highly granular and longitudinally compact device. A novel scheme for coupling a fiber to a scintillator plate has been designed that yields a high photoelectron response. Longitudinally, the calorimeter has a depth of four interaction lengths divided into two electromagnetic sections and two hadronic sections of 0.4, 0.4, 1.6, and 1.6 interaction lengths, respectively. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP SIMONGILLO, J (reprint author), TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843, USA. NR 12 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1991 VL 309 IS 3 BP 427 EP 437 DI 10.1016/0168-9002(91)90246-M PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT824 UT WOS:A1991GT82400008 ER PT J AU AUBERT, B BAZAN, A CAVANNA, F COLAS, J LEFLOUR, T VIALLE, JP GORDON, HA POLYCHRONAKOS, V RADEKA, V RAHM, D STEPHANI, D BAISIN, L BERSET, JC FABJAN, CW FOURNIER, D GILDEMEISTER, O JENNI, P LEFEBVRE, M MARIN, CP NESSI, M NESSITEDALDI, F PEPE, M POLESELLO, G RICHTER, W SIGRIST, A WILLIS, WJ CAMIN, DV COSTA, G GIANOTTI, F MANDELLI, L PESSINA, G ICONOMIDOUFAYARD, L MERKEL, B PETROFF, P REPELLIN, JP AF AUBERT, B BAZAN, A CAVANNA, F COLAS, J LEFLOUR, T VIALLE, JP GORDON, HA POLYCHRONAKOS, V RADEKA, V RAHM, D STEPHANI, D BAISIN, L BERSET, JC FABJAN, CW FOURNIER, D GILDEMEISTER, O JENNI, P LEFEBVRE, M MARIN, CP NESSI, M NESSITEDALDI, F PEPE, M POLESELLO, G RICHTER, W SIGRIST, A WILLIS, WJ CAMIN, DV COSTA, G GIANOTTI, F MANDELLI, L PESSINA, G ICONOMIDOUFAYARD, L MERKEL, B PETROFF, P REPELLIN, JP TI PERFORMANCE OF A LIQUID ARGON ELECTROMAGNETIC CALORIMETER WITH AN ACCORDION GEOMETRY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID IONIZATION AB The first prototype of a lead-liquid-argon e.m. calorimeter with accordion-shaped absorber and electrode plates has been built and tested with electron and muon beams at the CERN SPS. This novel geometry combines good granularity with high readout speed and minimal dead space. For a response peaking time of 140 ns, an energy resolution of 10%/square-root E[GeV] and a space resolution of 4.4 mm/square-root E[GeV] with a 2.7 cm cell size have been achieved for electrons. The position accuracy for muons is better than 2 mm. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CERRO TOLOLO INTERAMER OBSERV,LA SERENA,CHILE. UNIV MILAN,DIPARTMENTO FIS,I-20122 MILAN,ITALY. IST NAZL FIS NUCL,TRIESTE,ITALY. LAB ACCELERATOR LINEAIRE,ORSAY,FRANCE. RP AUBERT, B (reprint author), LAB ANNECY LE VIEUX PHYS PARTICULES,ANNECY,FRANCE. OI Cavanna, Flavio/0000-0002-5586-9964; Pessina, Gianluigi Ezio/0000-0003-3700-9757 NR 8 TC 43 Z9 43 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 NOV 15 PY 1991 VL 309 IS 3 BP 438 EP 449 DI 10.1016/0168-9002(91)90247-N PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT824 UT WOS:A1991GT82400009 ER PT J AU SCARLASSARA, F GLAGOLA, BG KUTSCHERA, W REHM, KE WUOSMAA, AH AF SCARLASSARA, F GLAGOLA, BG KUTSCHERA, W REHM, KE WUOSMAA, AH TI NUCLEAR-CHARGE SEPARATION OF LOW-ENERGY MEDIUM-MASS IONS WITH A GAS-FILLED MAGNETIC SPECTROMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID BRAGG-CURVE SPECTROSCOPY; DETECTOR; PRODUCTS AB An Enge split-pole spectrograph has been used in the gas-filled mode to study Z identification for ions at energies of about 1 MeV/u in different mass regions between A = 58 and A = 96. For Ni ions a Z resolution Z/DELTA-Z = 32 has been measured for particles with energies as low as 35 MeV. RP SCARLASSARA, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. OI Scarlassara, Fernando/0000-0002-4663-8216 NR 16 TC 4 Z9 4 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1991 VL 309 IS 3 BP 485 EP 488 DI 10.1016/0168-9002(91)90251-K PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT824 UT WOS:A1991GT82400013 ER PT J AU GARNETT, R GROSNICK, D JOHNSON, K LOPIANO, D OHASHI, Y RASK, A SHIMA, T SPINKA, H STANEK, R UNDERWOOD, D YOKOSAWA, A BEDDO, M BURLESON, G FAUCETT, JA KYLE, G DEVEREUX, M GLASS, G NATH, S JARMER, JJ PENTTILA, S JEPPESEN, R TRIPARD, G AF GARNETT, R GROSNICK, D JOHNSON, K LOPIANO, D OHASHI, Y RASK, A SHIMA, T SPINKA, H STANEK, R UNDERWOOD, D YOKOSAWA, A BEDDO, M BURLESON, G FAUCETT, JA KYLE, G DEVEREUX, M GLASS, G NATH, S JARMER, JJ PENTTILA, S JEPPESEN, R TRIPARD, G TI A NEUTRON HODOSCOPE FOR MEDIUM ENERGY NP SCATTERING EXPERIMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MONTE-CARLO PROGRAM; DETECTION EFFICIENCY; ORGANIC SCINTILLATORS; PLASTIC SCINTILLATOR; IMPROVED PREDICTIONS; ELASTIC-SCATTERING; CALIBRATION; COUNTER; NE213 AB A 24-element plastic scintillation counter hodoscope for np elastic and total cross section measurements at LAMPF is described. Details of construction, electronics, calibration with cosmic ray muons, and a determination of absolute detection efficiency at 289 and 435 MeV are presented. C1 ARGONNE NATL LAB,HIGH ENERGY PHYS LAB,ARGONNE,IL 60439. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. EARLHAM COLL,RICHMOND,IN 47374. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV MONTANA,MISSOULA,MT 59812. WASHINGTON STATE UNIV,PULLMAN,WA 99164. NR 69 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 NOV 15 PY 1991 VL 309 IS 3 BP 508 EP 520 DI 10.1016/0168-9002(91)90256-P PG 13 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GT824 UT WOS:A1991GT82400018 ER EF