FN Thomson Reuters Web of Science™ VR 1.0 PT J AU RISEN, W INGRAM, MD CHRYSSIKOS, G MENDIRATTA, SK STROM, U ANGELL, CA TSAI, TE DONTH, EJ BUNDE, A NGAI, KL MARTIN, S NITZAN, A MOYNIHAN, CT POLLAK, M BATES, J KREMER, F COLE, RH BERBERIAN, J KANERT, O HEITJANS, P JAIN, H AF RISEN, W INGRAM, MD CHRYSSIKOS, G MENDIRATTA, SK STROM, U ANGELL, CA TSAI, TE DONTH, EJ BUNDE, A NGAI, KL MARTIN, S NITZAN, A MOYNIHAN, CT POLLAK, M BATES, J KREMER, F COLE, RH BERBERIAN, J KANERT, O HEITJANS, P JAIN, H TI GLASSY IONICS - DISCUSSION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Discussion C1 UNIV ABERDEEN, DEPT CHEM, ABERDEEN AB9 2UE, SCOTLAND. NATL HELLENIC RES FDN, INST THEORET & PHYS CHEM, GR-11635 ATHENS, GREECE. UNIV AVEIRO, DEPT FIS, P-3800 AVEIRO, PORTUGAL. USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV HAMBURG, INST THEORET PHYS 1, W-2000 HAMBURG 36, GERMANY. USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV DORTMUND, DEPT PHYS, W-4600 DORTMUND 50, GERMANY. IOWA STATE UNIV SCI & TECHNOL, DEPT MAT SCI & ENGN, AMES, IA 50011 USA. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN USA. WEIZMANN INST SCI, DEPT CHEM PHYS, IL-76100 REHOVOT, ISRAEL. LEHIGH UNIV, BETHLEHEM, PA 18015 USA. BROWN UNIV, DEPT CHEM, PROVIDENCE, RI 02906 USA. RI Universidade Aveiro, Departamento Fisica/E-4128-2013; Chryssikos, Georgios/L-6488-2013; Mendiratta, Sushil Kumar/K-4429-2013 OI Mendiratta, Sushil Kumar/0000-0002-0207-4244 NR 0 TC 0 Z9 0 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 EI 1873-4812 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1991 VL 131 BP 1113 EP 1122 PN 2 PG 10 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600092 ER PT J AU LIEBETRAU, AM SCOTT, MJ AF LIEBETRAU, AM SCOTT, MJ TI STRATEGIES FOR MODELING THE UNCERTAIN IMPACTS OF CLIMATE CHANGE SO JOURNAL OF POLICY MODELING LA English DT Article ID COMPUTER AB Modeling of the physical and social effects of climate change is fraught with uncertainty. A hierarchy of computer codes often must be used, each with embedded uncertainties. Traditional methods of analyzing uncertainty - brute-force Monte Carlo analysis and sensitivity testing - are expensive and time-consuming. By means of a simple example, the article shows that to reduce cost, hierarchies can be analyzed by sensitivity experiments at selected design points. Reduced-form models are then simulated at each level of the hierarchy to summarize variables and functional relationships that truly matter, while preserving the statistical integrity of the distributions of outcomes. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 20 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0161-8938 J9 J POLICY MODEL JI J. Policy Model. PD SUM PY 1991 VL 13 IS 2 BP 185 EP 204 DI 10.1016/0161-8938(91)90010-V PG 20 WC Economics SC Business & Economics GA FV232 UT WOS:A1991FV23200002 ER PT J AU NARAYANAN, VA BELLO, JM STOKES, DL VO-DINH, T AF NARAYANAN, VA BELLO, JM STOKES, DL VO-DINH, T TI SURFACE-ENHANCED RAMAN ANALYSIS OF VITAMIN-B COMPLEX - QUANTITATIVE DETECTION OF P-AMINOBENZOIC ACID SO JOURNAL OF RAMAN SPECTROSCOPY LA English DT Article ID SCATTERING ANALYSIS; SILVER ELECTRODE; METAL-FILMS; SPECTROSCOPY; SPECTROMETRY; HYDROSOLS AB Surface-enhanced Raman scattering (SERS) spectra of vitamin B complex extracted in ethanol were analyzed using a silver-coated alumina substrate. The SERS effect appears to enhance selectively the spectrum of p-aminobenzoic acid (PABA) from among the complex constituents of the vitamin B complex tablet. A calibration graph of SERS signal intensity versus concentration of PABA was constructed for quantitative analysis. With such a graph it is possible to detect PABA down to low parts per million levels. The potential of the SERS technique in other analytical and biomedical areas is discussed. C1 OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 22 TC 16 Z9 16 U1 0 U2 14 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0377-0486 J9 J RAMAN SPECTROSC JI J. Raman Spectrosc. PD JUN PY 1991 VL 22 IS 6 BP 327 EP 331 DI 10.1002/jrs.1250220605 PG 5 WC Spectroscopy SC Spectroscopy GA FT507 UT WOS:A1991FT50700004 ER PT J AU LIGHTFOOT, P HRILJAC, JA PEI, S ZHENG, Y MITCHELL, AW RICHARDS, DR DABROWSKI, B JORGENSEN, JD HINKS, DG AF LIGHTFOOT, P HRILJAC, JA PEI, S ZHENG, Y MITCHELL, AW RICHARDS, DR DABROWSKI, B JORGENSEN, JD HINKS, DG TI BABIO2.5, A NEW BISMUTH OXIDE WITH A LAYERED STRUCTURE SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID POWDER NEUTRON-DIFFRACTION; INCOMMENSURATE MODULATION; CRYSTAL-STRUCTURES; SUPERCONDUCTIVITY; SYSTEM; COPPER; BA2BI3+BI5+O6; TEMPERATURE; BABIO3-X C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV ST ANDREWS,DEPT CHEM,ST ANDREWS KY16 9ST,FIFE,SCOTLAND. RP LIGHTFOOT, P (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. OI Lightfoot, Philip/0000-0001-7048-3982 NR 33 TC 28 Z9 28 U1 1 U2 7 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD JUN PY 1991 VL 92 IS 2 BP 473 EP 479 DI 10.1016/0022-4596(91)90353-J PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA FP224 UT WOS:A1991FP22400021 ER PT J AU RAI, D FELMY, AR FULTON, RW MOORE, DA AF RAI, D FELMY, AR FULTON, RW MOORE, DA TI AN AQUEOUS THERMODYNAMIC MODEL FOR CA2+-SO3(2-) ION INTERACTIONS AND THE SOLUBILITY PRODUCT OF CRYSTALLINE CASO3.1/2H2O SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE ION INTERACTION; HANNEBACHITE; SOLUBILITY; AQUEOUS THERMODYNAMICS; CASO3.1/2H2O(C); CASO3(0); SULFITE ID CHEMICAL-EQUILIBRIUM MODEL; MINERAL SOLUBILITIES; NATURAL-WATERS; INTERACTION PARAMETERS; HYDROUS OXIDE; ELECTROLYTES; PREDICTION; SYSTEM; 25-DEGREES-C; CONSTANTS AB The solubility of CaSO3.1/2H2O(c) was studied under alkaline conditions (pH > 8.2), in deaerated and deoxygenated Na2SO3 solutions ranging in concentration from 0.0002 to 0.4M and in CaCl2 solutions ranging in concentration from 0.0002 to 0.01M, for equilibration periods ranging from 1 to 7 days. Equilibrium was approached from both the over- and the under-saturation directions. In all cases, equilibrium was reached in < 1 day. The aqueous Ca2+-SO3(2-) ion interactions can be satisfactorily modeled using either ion-association or ion-interaction aqueous thermodynamic models. In the ion-association model, the log K-degree = 2.62 +/- 0.07 for Ca2+ + SO3(2-) reversible CaSO3(0). In the Pitzer ion-interaction model, the binary parameters beta(0) and beta(1) for Ca2+-SO4(2-) were used, and the value of beta(2) was determined from the experimental data. As expected given the strong association constant, the value of beta(2) was quite small (about -134). We feel a combination of the two models is most useful. The logarthm of the thermodynamic equilibrium constant (K-degrees) of the CaSO3.1/2H2O(c) solubility reaction (CaSO3.1/2H2O(c) reversible Ca2+ + SO3(2+) + 0.5H2O) was found to be -6.64 +/- 0.07. RP RAI, D (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 22 TC 5 Z9 5 U1 1 U2 7 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 JUN PY 1991 VL 20 IS 6 BP 623 EP 632 DI 10.1007/BF00647072 PG 10 WC Chemistry, Physical SC Chemistry GA FT844 UT WOS:A1991FT84400008 ER PT J AU SEGEL, LA PERELSON, AS AF SEGEL, LA PERELSON, AS TI EXPLOITING THE DIVERSITY OF TIME SCALES IN THE IMMUNE-SYSTEM - A B-CELL ANTIBODY MODEL SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article DE IMMUNE SYSTEM MODELING; SHAPE SPACE ID IDIOTYPIC NETWORK; DYNAMICS; SURFACE AB Using the continuous shape space formalism, we develop an immune system model involving both B lymphocytes and antibody molecules. The binding and cross-linking of receptors on B cells stimulates the cells to divide and, with a lag, to secrete antibody. Using the method of multiple scales, we show how to correctly formulate long-time-scale equations for the population dynamics of B cells, the total antibody concentration, and rate of antibody secretion. We compare our model with previous phenomenological formulations. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET BIOL & BIOPHYS THEORET,LOS ALAMOS,NM 87545. RP SEGEL, LA (reprint author), WEIZMANN INST SCI,DEPT APPL MATH & COMP SCI,IL-76100 REHOVOT,ISRAEL. NR 18 TC 16 Z9 16 U1 2 U2 2 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 JUN PY 1991 VL 63 IS 5-6 BP 1113 EP 1131 DI 10.1007/BF01030002 PG 19 WC Physics, Mathematical SC Physics GA FV049 UT WOS:A1991FV04900020 ER PT J AU SIKERWAR, SS DOWNING, KH GLAESER, RM AF SIKERWAR, SS DOWNING, KH GLAESER, RM TI 3-DIMENSIONAL STRUCTURE OF AN INVERTEBRATE INTERCELLULAR COMMUNICATING JUNCTION SO JOURNAL OF STRUCTURAL BIOLOGY LA English DT Article ID X-RAY-DIFFRACTION; LOW RESISTANCE JUNCTIONS; HEPATIC GAP-JUNCTIONS; ELECTRON-MICROSCOPY; PLASMA-MEMBRANES; PURPLE MEMBRANE; LIVER; PROTEIN; CRAYFISH; TISSUE RP SIKERWAR, SS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [GM36884] NR 71 TC 18 Z9 19 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1047-8477 J9 J STRUCT BIOL JI J. Struct. Biol. PD JUN PY 1991 VL 106 IS 3 BP 255 EP 263 DI 10.1016/1047-8477(91)90075-8 PG 9 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA FR232 UT WOS:A1991FR23200009 PM 1804280 ER PT J AU MCKONE, TE KNEZOVICH, JP AF MCKONE, TE KNEZOVICH, JP TI THE TRANSFER OF TRICHLOROETHYLENE (TCE) FROM A SHOWER TO INDOOR AIR - EXPERIMENTAL MEASUREMENTS AND THEIR IMPLICATIONS SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID WATER; EXPOSURE; CHEMICALS AB Experiments were performed to measure the transfer of trichloroethylene (TCE), a volatile organic compound (VOC), from tap water in showers to indoor air. In these experiments, the loss of TCE from tap water In the shower is based on the difference between influent and effluent concentrations. We have developed and previously published a three-compartment model, which we use to simulate the 24-h concentration history of VOCs In the shower, bathroom, and remaining household volumes resulting from the use of contaminated tap water. An important input to this model is the transfer efficiency of the VOC from water to air. The experiments reveal that the transfer efficiency of TCE from shower water to air has an arithmetic mean value of 61 percent and an arithmetic standard deviation of 9 percent. Analysis of the results shows that there is no statistically significant difference between the transfer efficiency measured with hot (37-degrees-C) or cold (22-degrees-C) shower water and that there is no statistically significant change in transfer efficiency with time during a 20-min shower. The implications for exposure assessment are considered. RP MCKONE, TE (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM SCI,POB 5507 L-453,LIVERMORE,CA 94550, USA. NR 15 TC 25 Z9 25 U1 1 U2 5 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA PO BOX 2861, PITTSBURGH, PA 15230 SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD JUN PY 1991 VL 41 IS 6 BP 832 EP 837 PG 6 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA FU112 UT WOS:A1991FU11200008 PM 1910750 ER PT J AU CHU, MY RAHAMAN, MN DEJONGHE, LC BROOK, RJ AF CHU, MY RAHAMAN, MN DEJONGHE, LC BROOK, RJ TI EFFECT OF HEATING RATE ON SINTERING AND COARSENING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE ZINC OXIDE; SINTERING; MICROSCOPY; DENSIFICATION; HEAT TREATMENT ID HETEROGENEOUS POWDER COMPACTS; TEMPERATURE; KINETICS AB The sintering of zinc oxide powder compacts has been investigated at constant rates of heating of 0.5-degrees to 15-degrees-C/min. For samples with the same initial relative density (0.50), the temperature derivative of the densification strain versus density fits within a single, relatively narrow band. At low temperatures the densification rate as a function of temperature increases almost linearly with the heating rate. The data, covering a wide density range of 0.5 to 0.98, are consistent with an analysis that accounts for the coarsening (defined as an increase in the mean pore separation) in terms of two classes of microstructural coarsening processes: those associated with densifying and with nondensifying mechanisms. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. MAX PLANCK INST MET RES,W-7000 STUTTGART 80,GERMANY. UNIV MISSOURI,DEPT CERAM ENGN,ROLLA,MO 65401. RP CHU, MY (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 23 TC 92 Z9 99 U1 1 U2 15 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 JUN PY 1991 VL 74 IS 6 BP 1217 EP 1225 DI 10.1111/j.1151-2916.1991.tb04090.x PG 9 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800005 ER PT J AU STEFFEN, AA DAUSKARDT, RH RITCHIE, RO AF STEFFEN, AA DAUSKARDT, RH RITCHIE, RO TI CYCLIC FATIGUE LIFE AND CRACK-GROWTH BEHAVIOR OF MICROSTRUCTURALLY SMALL CRACKS IN MAGNESIA-PARTIALLY-STABILIZED ZIRCONIA CERAMICS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE ZIRCONIA - PARTIALLY STABILIZED (PSZ); MAGNESIA; CRACK GROWTH; CYCLIC FATIGUE; FRACTURE ID TRANSFORMATION-TOUGHENED CERAMICS; PROPAGATION; RESISTANCE; GLASS; ZONES AB Cyclic fatigue stress/life (S/N) and crack-growth properties are investigated in magnesia-partially-stabilized zirconia (Mg-PSZ), with particular reference to the role of crack size. The material studied is subeutectoid aged to vary the steady-state fracture toughness, K(c), from approximately 3 to 16 MPa.m1/2. S/N data from unnotched specimens show markedly lower lives under tension-compression compared with tension-tension loading; "fatigue limits" (at 10(8) cycles) for the former case approach 50% of the tensile strength. Under tension-tension loading, cyclic crack-growth rates of "long" (> 3 mm) cracks are found to be power-law dependent on the stress-intensity range, DELTA-K, with a fatigue threshold, DELTA-K(TH), of order 50% of K(c). Conversely, naturally occurring "small" (1 to 100-mu-m) surface cracks are observed to grow at DELTA-K levels 2 to 3 times smaller than DELTA-K(TH), similar to behavior widely reported for metallic materials. The observed small-crack behavior is rationalized in terms of the restricted role of crack-tip shielding (in PSZ from transformation toughening) with cracks of limited wake, analogous to the reduced role of crack closure with small fatigue cracks in metals. The implications of such data for structural design with ceramics are briefly discussed. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 37 TC 52 Z9 52 U1 0 U2 6 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 JUN PY 1991 VL 74 IS 6 BP 1259 EP 1268 DI 10.1111/j.1151-2916.1991.tb04095.x PG 10 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800010 ER PT J AU BROW, RK PHIFER, CC TURNER, GL KIRKPATRICK, RJ AF BROW, RK PHIFER, CC TURNER, GL KIRKPATRICK, RJ TI CATION EFFECTS ON P-31 MAS NMR CHEMICAL-SHIFTS OF METAPHOSPHATE GLASSES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE BONDING; GLASS; PHOSPHATES; STRUCTURE; SPECTROSCOPY ID X-RAY-DIFFRACTION; MAGIC-ANGLE; PHOSPHATE-GLASSES; CRYSTALLINE; NETWORK; TENSORS AB We have examined a series of metaphosphate glasses with P-31 magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Increasing the ionic potential (Z/a) of the modifying cation from sodium to magnesium causes a systematic change to more shielded isotropic chemical shifts with a concomitant increase in the peak FWHM. These spectral trends are consistent with counterion-induced modifications to the ionic character of the P-O bond. Such modifications do not produce significant changes in either the chemical shift anisotropy or the asymmetry parameter. C1 SPECTRAL DATA SERV,CHAMPAIGN,IL 61820. UNIV ILLINOIS,DEPT GEOL,URBANA,IL 61801. RP BROW, RK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 29 TC 82 Z9 82 U1 3 U2 15 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 JUN PY 1991 VL 74 IS 6 BP 1287 EP 1290 DI 10.1111/j.1151-2916.1991.tb04099.x PG 4 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800014 ER PT J AU KIM, HE MOORHEAD, AJ AF KIM, HE MOORHEAD, AJ TI CORROSION AND STRENGTH OF SIC-WHISKER-REINFORCED ALUMINA EXPOSED AT HIGH-TEMPERATURES TO H2-H2O ATMOSPHERES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE HIGH TEMPERATURE; CORROSION; COMPOSITES; HYDROGEN; WATER ID ALPHA-SILICON CARBIDE; TOUGHENING BEHAVIOR; MATRIX COMPOSITES; FLEXURAL STRENGTH; ACTIVE OXIDATION AB The flexural strengths and corrosion behavior of a SiC-whisker-reinforced alumina composite material (Al2O3-SiC(w)) were studied as functions of time, temperature, and P(H2O) in H-2-H2O environments. Experimental conditions included temperatures of 1300-degrees and 1400-degrees-C, exposure times up to 30 h, and water vapor levels ranging from very dry (P(H2O) = 4.6 x 10(-7) MPa) to relatively wet (P(H2O)) 2.2 x 10(-3) MPa). The study showed that the weight, strength, composition, and microstructure were strongly dependent on the P(H2O) level in the environment. When the P(H2O) in the H-2 atmosphere was low, active oxidation of the SiC whiskers in the composite occurred, causing severe reductions in the weight and strength of the samples. At 1400-degrees-C, the most severe degradation was observed following exposure to an atmosphere with P(H2O) = 1.3 x 10(-5) MPa. Exposure for 10 h to such an environment reduced the room-temperature flexural strength of the material to less than 50% of that of the unexposed samples. At higher water vapor levels, the reductions in weight and strength became less severe because of the formation of aluminosilicate glass and mullite at the sample surface. Finally, when the composite was exposed at 1400-degrees-C to H-2 atmospheres containing water vapor pressures of 5 x 10(-4) MPa and above, weight gains were observed; and the strength of the material was significantly higher than that of the unexposed material. The increase in strength was attributed to crack healing or blunting as a result of the formation of aluminosilicate glass and mullite on the sample surface. Similar dependencies of strength and weight on the level of oxidant (H2O) in the atmosphere were noted following the exposures at 1300-degrees-C; however, the effects were smaller in magnitude. RP KIM, HE (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 23 TC 10 Z9 10 U1 0 U2 2 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 JUN PY 1991 VL 74 IS 6 BP 1354 EP 1359 DI 10.1111/j.1151-2916.1991.tb04111.x PG 6 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800026 ER PT J AU BUNKER, BC KIRKPATRICK, RJ BROW, RK AF BUNKER, BC KIRKPATRICK, RJ BROW, RK TI LOCAL-STRUCTURE OF ALKALINE-EARTH BOROALUMINATE CRYSTALS AND GLASSES .1., CRYSTAL CHEMICAL CONCEPTS STRUCTURAL PREDICTIONS AND COMPARISONS TO KNOWN CRYSTAL-STRUCTURES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE BORATES; ALUMINOBORATES; GLASS; MODELS; STRUCTURE ID BORATE GLASSES; NMR; ALUMINUM; AL-27; POLYMORPHS; SHIFT AB This paper presents a model which predicts glass structures based on local charge balance considerations. The model is shown to be consistent with known structures of borate, aluminate, and boroaluminate crystals and predicts that boroaluminate glasses should contain 3- and 4-coordinate boron, 4-, 5-, and 6-coordinate aluminum, and oxygens coordinated to one, two, three, and perhaps even four network-forming cations. The predicted glass structures are more complex than previous models for boroaluminate glasses, explaining the solid-state NMR data for the boroaluminate glasses discussed in Part II. C1 UNIV ILLINOIS,DEPT GEOL,URBANA,IL 61801. RP BUNKER, BC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 39 TC 48 Z9 48 U1 3 U2 13 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 JUN PY 1991 VL 74 IS 6 BP 1425 EP 1429 DI 10.1111/j.1151-2916.1991.tb04123.x PG 5 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800038 ER PT J AU BUNKER, BC KIRKPATRICK, RJ BROW, RK TURNER, GL NELSON, C AF BUNKER, BC KIRKPATRICK, RJ BROW, RK TURNER, GL NELSON, C TI LOCAL-STRUCTURE OF ALKALINE-EARTH BOROALUMINATE CRYSTALS AND GLASSES .2., B-11 AND AL-27 MAS NMR-SPECTROSCOPY OF ALKALINE-EARTH BOROALUMINATE GLASSES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE ALUMINOBORATE; GLASS; NUCLEAR MAGNETIC RESONANCE; STRUCTURE; MODELS ID NUCLEAR MAGNETIC-RESONANCE; HIGH-RESOLUTION AL-27; CHEMICAL-SHIFT; CLAY-MINERALS; ALUMINUM; BORATE; COORDINATION; SILICATES; SOLIDS AB B-11 and Al-27 magic angle spinning nuclear magnetic resonance (MAS NMR) spectra of alkaline-earth boroaluminate glasses show that the structures of these glasses are far more complicated than previously thought. The relative concentrations of 3- and 4-coordinated boron vary as found by previous investigators using continuous-wave NMR methods, but the Al-27 NMR spectra indicate the presence of Al in 4-, 5-, and 6-fold coordination, in contrast to previous assignments. Analysis of the data based on local charge balance considerations provides a qualitative model that correctly predicts compositional variations of the NMR peak intensities and Al-27 chemical shifts for a wide range of boroaluminate glass compositions. C1 UNIV ILLINOIS,DEPT GEOL,URBANA,IL 61801. SPECTRAL DATA SERV,CHAMPAIGN,IL 61820. RP BUNKER, BC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 39 TC 110 Z9 110 U1 3 U2 18 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 JUN PY 1991 VL 74 IS 6 BP 1430 EP 1438 DI 10.1111/j.1151-2916.1991.tb04124.x PG 9 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800039 ER PT J AU KIM, HE ZINKLE, SJ ALLEN, WR AF KIM, HE ZINKLE, SJ ALLEN, WR TI PREPARATION OF MAGNESIUM ALUMINATE SPINEL CONTAINING CONTROLLED AMOUNTS OF O-17 ISOTOPE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note DE MAGNESIUM; ALUMINATE; NUCLEAR REACTION; SPINELS; PROCESSING AB Magnesium aluminate spinel (MgAl2O4) with an O-17 enrichment (O-17/O(Tot)) of about 23 at.% was prepared by reacting fine mixtures of aluminum hydroxide (enriched with O-17) and magnesium oxide of normal isotopic content. The material was prepared for experiments in which the radiation damage produced in a fusion reactor is simulated by fission reactor exposures. The powder mixtures were obtained by hydrolyzing, with water containing the O-17 isotope, a mixture of aluminum isopropoxide and magnesium oxide powder. The mixture was converted into pure spinel by a series of heat treatments and grindings. Essentially fully dense bodies, which contained about 45% of the O-17 isotope initially present in the water, were successfully fabricated provided that all thermal treatments were conducted in argon or vacuum atmospheres. RP KIM, HE (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. NR 8 TC 4 Z9 5 U1 1 U2 1 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1991 VL 74 IS 6 BP 1442 EP 1444 DI 10.1111/j.1151-2916.1991.tb04126.x PG 3 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800041 ER PT J AU CARIM, AH TUTTLE, BA DOUGHTY, DH MARTINEZ, SL AF CARIM, AH TUTTLE, BA DOUGHTY, DH MARTINEZ, SL TI MICROSTRUCTURE OF SOLUTION-PROCESSED LEAD ZIRCONATE TITANATE (PZT) THIN-FILMS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note DE LEAD ZIRCONATE TITANATE; FERROELECTRICS; THIN FILMS; ELECTRON MICROSCOPY; MICROSTRUCTURE AB Lead zirconate titanate (PZT) thin films with a composition near the morphotropic phase boundary (Zr/Ti = 53/47) were fabricated by spin deposition of an alkoxide-derived solution and annealed at 650-degrees-C for 30 min. A complex microstructure is observed in which micrometer-scale rosettes of the desired perovskite phase are surrounded by nanocrystalline (10 to 15 nm) grains of pyrochlore structure. Transmission electron microscopy (TEM) demonstrates that the perovskite rosettes-features of approximately circular cross section which grow rapidly within the confined conditions of the thin film-are single crystals despite being highly porous. Pockets of lead-deficient pyrochlore extend throughout the thickness of the film. The only effects of Nb (2%) doping on the microstructure are to increase the fraction of the perovskite phase and the perovskite grain size. Despite the highly irregular shape of the perovskite particles and the presence of some pyrochlore, reasonable ferroelectric properties are measured (spontaneous polarization P(s) almost-equal-to 0.2 C/m2). C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 11 TC 142 Z9 144 U1 4 U2 29 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 JUN PY 1991 VL 74 IS 6 BP 1455 EP 1458 DI 10.1111/j.1151-2916.1991.tb04130.x PG 4 WC Materials Science, Ceramics SC Materials Science GA FQ928 UT WOS:A1991FQ92800045 ER PT J AU WEST, AC NEWMAN, J AF WEST, AC NEWMAN, J TI CURRENT DISTRIBUTIONS ON RECESSED ELECTRODES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB The primary current distributions on disk electrodes and two-dimensional electrodes that are recessed in insulating planes are given. The ohmic resistances are also given and are compared to previous estimates that were given in Ref. (2-5). A singular-perturbation analysis, valid for small aspect ratios, shows general behavior to be expected for all cells containing an electrode that is recessed slightly from the insulating plane. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RI Newman, John/B-8650-2008 OI Newman, John/0000-0002-9267-4525 NR 19 TC 27 Z9 27 U1 0 U2 5 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 JUN PY 1991 VL 138 IS 6 BP 1620 EP 1625 DI 10.1149/1.2085844 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FQ104 UT WOS:A1991FQ10400020 ER PT J AU VITT, JE JOHNSON, DC ENGSTROM, RC AF VITT, JE JOHNSON, DC ENGSTROM, RC TI THE EFFECT OF ELECTRODE MATERIAL ON THE ELECTROGENERATED CHEMILUMINESCENCE OF LUMINOL SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID OXYGEN-TRANSFER REACTIONS; LEAD DIOXIDE ELECTRODES; CHEMI-LUMINESCENCE; ELECTROCATALYSIS; HETEROGENEITY; MECHANISM AB The oxidation of luminol and its concomitant electrogenerated chemiluminescence (ECL) were studied at several electrode materials by voltammetry and chronoamperometry. The ECL intensity (I(ECL)) was inversely related to the activity of the electrodes. The lowest I(ECL) was measured when luminol was oxidized to 3-aminophthalate (n = congruent-to 4 eq mol-1) at a nearly mass-transport limited rate at glassy carbon. The ECL kinetics were studied and the order of the reaction with respect to luminol was 3/2 at concentrations to ca. 1 mM when O2 was the coreactant. In the presence of H2O2, the ECL reaction was first order with respect to luminol. A reaction mechanism is proposed that is consistent with the kinetic data and the inverse relationship between electrode activity and I(ECL). The implications of these results are discussed with respect to imaging the spatial distribution of current density at electrode surfaces, including that of PbO2 films activated by adsorbed Bi(V). A value of 6.6 x 10(-6) cm2 S-1 was determined for the diffusion coefficient of luminol in 0.1M NaOH. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV S DAKOTA,DEPT CHEM,VERMILLION,SD 57069. RP VITT, JE (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 20 TC 72 Z9 72 U1 0 U2 8 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 JUN PY 1991 VL 138 IS 6 BP 1637 EP 1643 DI 10.1149/1.2085846 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FQ104 UT WOS:A1991FQ10400022 ER PT J AU BHATTACHARYA, RN NOUFI, R ROYBAL, LL AHRENKIEL, RK AF BHATTACHARYA, RN NOUFI, R ROYBAL, LL AHRENKIEL, RK TI YBACUO SUPERCONDUCTOR THIN-FILMS VIA AN ELECTRODEPOSITION PROCESS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID PULSED LASER EVAPORATION; MOLECULAR-BEAM EPITAXY; CU-O; OXIDE-FILMS; BULK AB Thin film superconductors of YBaCuO are fabricated via an electrodeposition process from a single electrolyte solution consisting of the nitrate salts of Y(III), Ba(II), and Cu(II) dissolved in an organic solvent dimethyl sulfoxide. Nominal deposition potentials ranging from -2.5 to -4 V (vs. Ag/AgNO3 reference electrode) are employed. The postannealed electrodeposited films show reproducible zero resistance at about 74 K on Ni, 78 K on MgO, and 91 K on cubic zirconia substrate. The meissner measurements also support the superconductivity behavior of the thin films. Critical current density of the films deposited on ZrO2 is 4000 A/cm2 in zero field at 4 K, and 360 A/cm2 at 77 K, zero field. RP BHATTACHARYA, RN (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. NR 14 TC 42 Z9 42 U1 1 U2 1 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD JUN PY 1991 VL 138 IS 6 BP 1643 EP 1645 DI 10.1149/1.2085847 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FQ104 UT WOS:A1991FQ10400023 ER PT J AU TSAO, SS GUILINGER, TR KELLY, MJ KAUSHIK, VS DATYE, AK AF TSAO, SS GUILINGER, TR KELLY, MJ KAUSHIK, VS DATYE, AK TI POROUS SILICON FORMATION IN N-/N+/N- DOPED STRUCTURES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID LAYERS AB We examine how dopant profile and anodization conditions affect the formation of buried porous silicon layers in n-/n+/n- doped wafers. Wafers with peak n+ donor concentration less-than-or-equal-to 10(18)/cm3 exhibit stray dendritic pores propagating from the n+ layer into the n- layers. Depending on the anodization conditions these large diameter dendritic pores can even penetrate the entire upper n- layer, making it unusable for silicon-on-insulator device applications. Lower anodization voltages produce shorter dendrite lengths. Wafers with peak n+ donor concentration greater-than-or-equal-to 3 x 10(18)/cm3 exhibit negligible stray dendritic pores. In these wafers the buried porous silicon layer is confined only to areas with doping level greater-than-or-equal-to 1-2 x 10(17)/cm3. These results should help in optimizing n-/n+/n- doping profiles and anodization conditions for silicon-on-insulator device applications. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. RP TSAO, SS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. OI Datye, Abhaya/0000-0002-7126-8659 NR 16 TC 10 Z9 10 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 JUN PY 1991 VL 138 IS 6 BP 1739 EP 1743 DI 10.1149/1.2085864 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FQ104 UT WOS:A1991FQ10400040 ER PT J AU BREILAND, WG EVANS, GH AF BREILAND, WG EVANS, GH TI DESIGN AND VERIFICATION OF NEARLY IDEAL FLOW AND HEAT-TRANSFER IN A ROTATING-DISK CHEMICAL VAPOR-DEPOSITION REACTOR SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID EPITAXIAL-GROWTH; OMVPE REACTOR; MODEL; CVD AB A research chemical vapor deposition reactor design is presented for a rotating disk configuration. The reactor can be operated under conditions such that nearly ideal, one-dimensional, infinite-radius disk behavior is achieved over most of the disk surface. Boundary conditions, flow stability under both isothermal and heated-disk conditions, and gas temperatures are addressed with both one- and two-dimensional numerical fluid mechanics models. Experimental verification of the design using flow visualization and laser Raman thermometry are presented. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP BREILAND, WG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 28 TC 66 Z9 66 U1 1 U2 7 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 JUN PY 1991 VL 138 IS 6 BP 1806 EP 1816 DI 10.1149/1.2085878 PG 11 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FQ104 UT WOS:A1991FQ10400054 ER PT J AU MULHOLLAND, PJ STEINMAN, AD PALUMBO, AV DEANGELIS, DL FLUM, TE AF MULHOLLAND, PJ STEINMAN, AD PALUMBO, AV DEANGELIS, DL FLUM, TE TI INFLUENCE OF NUTRIENTS AND GRAZING ON THE RESPONSE OF STREAM PERIPHYTON COMMUNITIES TO A SCOUR DISTURBANCE SO JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY LA English DT Article DE STREAMS; DISTURBANCE; STABILITY; RESISTANCE; RESILIENCE; HERBIVORY; SCOUR; PERIPHYTON; SNAILS AB We examined the effect of nutrient input and grazing intensity on resistance and resilience of periphyton communities in laboratory streams to a scour disturbance. Previous theoretical studies using stream models indicated that resilience of nutrient-limited streams, as defined by the return time to the initial state, is strongly related to the residence time of nutrients in the system and to the presence of herbivores. To experimentally test this prediction we established two levels of nutrient input by altering the flow regime (once-through flow and 98% recirculated flow) and two levels of grazing intensity by the presence or absence of the snail Elimia clavaeformis, resulting in a 2 x 2 factorial design with two replicate streams per treatment. After the streams reached an approximately stable level of periphyton biomass, a scour disturbance was imposed on all streams. Measures of the resistance and resilience of the periphyton to this disturbance were made. The resistance of most structural characteristics of the periphyton was significantly higher in streams with snails than in streams without snails. Nutrient input had little effect on resistance of all periphyton characteristics. Resilience was measured by two parameters: rate of increase of a particular characteristic over time following the disturbance (r), and time to return to the predisturbance state (T(s)). The experimental results on resilience were complex. In general, high grazing intensity resulted in low values of r for most periphyton characteristics, but also shorter T(s) for some characteristics. The shorter T(s) values were attributed to lower pre-disturbance biomass and metabolism in the streams with snails compensating for lower r for these characteristics following the disturbance. Contrary to model predictions, low nutrient input generally did not result in low resilience for most characteristics in the streams without snails, probably because increased nutrient recycling compensated for low inputs. However, for the streams with snails, resilience of most periphyton characteristics was lower in streams with low nutrient input compared with streams with higher nutrient input. This contrast in resilience suggests a positive feedback between biomass accrual and nutrient recycling that helps maintain high productivity despite low nutrient inputs during recovery of stream periphyton communities from disturbance. RP MULHOLLAND, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Palumbo, Anthony/A-4764-2011; Mulholland, Patrick/C-3142-2012 OI Palumbo, Anthony/0000-0002-1102-3975; NR 0 TC 45 Z9 46 U1 1 U2 17 PU NORTH AMER BENTHOLOGICAL SOC PI LAWRENCE PA 1041 NEW HAMSPHIRE STREET, LAWRENCE, KS 66044 SN 0887-3593 J9 J N AM BENTHOL SOC JI J. N. Am. Benthol. Soc. PD JUN PY 1991 VL 10 IS 2 BP 127 EP 142 DI 10.2307/1467573 PG 16 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA FT290 UT WOS:A1991FT29000003 ER PT J AU DEUTSCH, IH GARRISON, JC WRIGHT, EM AF DEUTSCH, IH GARRISON, JC WRIGHT, EM TI EXCESS NOISE IN GAIN-GUIDED AMPLIFIERS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID SPONTANEOUS EMISSION FACTOR; LONGITUDINAL EIGENMODES; LASER; NONORTHOGONALITY AB A second-quantized theory of the radiation field is used to study the origin of the excess noise observed in gain-guided amplifiers. We find that the reduction of the signal-to-noise ratio is a function of the length of the amplifier, and thus the enhancement of the noise is a propagation effect arising from longitudinally inhomogeneous gain of the noise rather than from an excess of local spontaneous emission. We confirm this conclusion by showing that the microscopic rate of spontaneous emission into a given non-power-orthogonal cavity mode is not enhanced by the Petermann factor. In addition, we illustrate the difficulties associated with photon statistics for this and other open systems by showing that no acceptable family of photon-number operators corresponds to a set of non-power-orthogonal cavity modes. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. RP DEUTSCH, IH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Wright, Ewan/A-2358-2009; Deutsch, Ivan/D-1882-2009 OI Deutsch, Ivan/0000-0002-1733-5750 NR 17 TC 30 Z9 30 U1 0 U2 3 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 JUN PY 1991 VL 8 IS 6 BP 1244 EP 1251 DI 10.1364/JOSAB.8.001244 PG 8 WC Optics SC Optics GA FP541 UT WOS:A1991FP54100008 ER PT J AU LAYNE, SP MERGES, MJ SPOUGE, JL DEMBO, M NARA, PL AF LAYNE, SP MERGES, MJ SPOUGE, JL DEMBO, M NARA, PL TI BLOCKING OF HUMAN-IMMUNODEFICIENCY-VIRUS INFECTION DEPENDS ON CELL-DENSITY AND VIRAL STOCK AGE SO JOURNAL OF VIROLOGY LA English DT Article ID RECOMBINANT SOLUBLE CD4; NEUTRALIZING MONOCLONAL-ANTIBODY; AIDS-RELATED COMPLEX; ENVELOPE GLYCOPROTEIN; SYNCYTIUM FORMATION; HIV INFECTIVITY; HTLV-III/LAV; T4 ANTIGEN; GP120; TYPE-1 AB Quantitative infectivity assays were used to study how the blocking activity of soluble CD4 (sCD4) is affected by sCD4 concentration, target cell density, and viral stock age. During incubation with 20 nM sCD4, human immunodeficiency virus type 1 (HIV-1) stocks underwent irreversible inactivation. In contrast, inactivation with 2 nM sCD4 was almost entirely reversible. At lower sCD4 concentrations (less-than-or-equal-to 2 nM) and target cell densities of 6.25 x 10(4) ml-1, sCD4 blocking activity for HIV-1 gave a gp120-sCD4 association constant (K(assoc)) of 1.7 x 10(9) M-1, which agrees with chemical measurements. At the higher density of 1.6 x 10(7) cells ml-1, however, the blocking activity was 20-fold less. During incubation of HIV-1 stock optimized for infectivity by rapid harvest, sCD4 blocking activity increased 20-fold during a 3-h window. These results show that competitive blocking activity depends strongly on target cell density and virion age. Thus, unappreciated variations in HIV stocks and assay conditions may hinder comparisons of blockers from laboratory to laboratory, and the age of HIV challenge stocks may influence studies of drug and vaccine efficacy. The results also suggest that blocking of viral particles in lymphoid compartments will require very high competitive blocker concentrations, which may explain the refractory outcomes from sCD4-based drug trials in humans. C1 NCI,FREDERICK CANC RES & DEV CTR,TUMOR CELL BIOL SECT,VIRUS BIOL SECT,FREDERICK,MD 21701. NATL LIB MED,NATL CTR BIOTECHNOL INFORMAT,BETHESDA,MD 20894. RP LAYNE, SP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87544, USA. RI Dembo, Micah/C-2755-2013 NR 64 TC 56 Z9 56 U1 0 U2 2 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 JUN PY 1991 VL 65 IS 6 BP 3293 EP 3300 PG 8 WC Virology SC Virology GA FM165 UT WOS:A1991FM16500062 PM 1674549 ER PT J AU FITZMAURICE, DJ FREI, H AF FITZMAURICE, DJ FREI, H TI TRANSIENT NEAR-INFRARED SPECTROSCOPY OF VISIBLE-LIGHT SENSITIZED OXIDATION OF I- AT COLLOIDAL TIO2 SO LANGMUIR LA English DT Article ID INTERFACIAL ELECTRON-TRANSFER; TITANIUM-DIOXIDE; AQUEOUS-SOLUTION; SEMICONDUCTORS; DYNAMICS; SYSTEMS; LASER; WATER; PHOTOCHEMISTRY; PHOTOPHYSICS AB Visible light induced photooxidation of iodide at dye-sensitized TiO2 colloid has been monitored in real time by near-infrared absorption spectroscopy. Sensitizers used were phenylfluorone (PF) and tris(2,2'-biphenyl-4,4'-dicarboxylate)ruthenium(II) dichloride (RuL3). In the case of ethanolic and aqueous PF/TiO2sol, a transient was observed in the 700-800 nm region whose spectral profile and extinction coefficient allowed assignment to I2-(2-PI-g <-- 2-SIGMA-u+)'. The decay of the transient followed a second-order rate law with a rate constant consistent with disproportionation of I2-radical to I3- and I-. At low iodide concentration, the signal rise could be resolved and was found to be linear in [I-] with k = (1.2 +/- 0.2) x 10(8) L mol-1 s-1 (ethanol). The most probable explanation for the observed rise is reaction of surface-adsorbed I atoms with I- from the bulk of the solution to give I2-. Adsorbed I atoms would be formed within the duration of the nanosecond laser pulse by reaction of oxidized sensitizer with surface-adsorbed I-. The efficiency of I- photooxidation at the PF/TiO2 colloid was found to be much lower than the corresponding photoelectrochemical efficiency at a PF/TiO2 polycrystalline electrode. We attribute it to recapture of photoinjected conduction band electrons by adsorbed I atoms. An unexpected deviation from a monotonous increase of the I2- yield as a function of I- concentration in the range of 10(-4) to 0.2 M is interpreted in terms of a wide spread of the rates of electron recapture by adsorbed I atoms. In the case of aqueous RuL3 coated TiO2 colloid, a transient observed in the 700-800-nm range has an extinction coefficient 6 times larger than that of I2-. The signal decayed according to a single exponential law with a rate constant of k = 3 x 10(3) s-1 that was independent of iodide concentration. The absorption is assigned to a charge transfer transition of an initially formed Ru(II)L3I2- ion pair. It dissociates subsequently to I2- and sensitizer. The rise of the transient, and the observed low oxidation yields compared to those reported for corresponding photoelectrochemical cell experiments are interpreted similarly to the PF/TiO2 case. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. NR 38 TC 67 Z9 67 U1 2 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1991 VL 7 IS 6 BP 1129 EP 1137 DI 10.1021/la00054a019 PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FT336 UT WOS:A1991FT33600019 ER PT J AU VOGEL, V MULLIN, CS SHEN, YR AF VOGEL, V MULLIN, CS SHEN, YR TI PROBING THE STRUCTURE OF THE ADSORPTION LAYER OF SOLUBLE AMPHIPHILIC MOLECULES AT THE AIR-WATER-INTERFACE SO LANGMUIR LA English DT Article ID 2ND HARMONIC-GENERATION; SURFACE ACTIVE SUBSTANCE; SODIUM DODECYLSULFATE; AQUEOUS SURFACE; RADIOTRACER; ORIENTATION AB Optical second harmonic generation (SHG) together with surface tension measurements are used to investigate soluble amphiphilic molecules adsorbed at the air/water interface from solution. It is found that the adsorbed molecules form a single polar-oriented monolayer which, at saturation, resembles a close-packed monolayer of insoluble molecules. SHG is particularly sensitive to the noninversion symmetry of the interfacial region and therefore provides an inherent discrimination against isotropically oriented molecules in the subsurface and the solution. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RI Vogel, Viola/O-8025-2015 OI Vogel, Viola/0000-0003-2898-7671 NR 20 TC 20 Z9 20 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1991 VL 7 IS 6 BP 1222 EP 1224 DI 10.1021/la00054a033 PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FT336 UT WOS:A1991FT33600033 ER PT J AU BOSTON, HL HILL, WR AF BOSTON, HL HILL, WR TI PHOTOSYNTHESIS LIGHT RELATIONS OF STREAM PERIPHYTON COMMUNITIES SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Article ID MARINE-PHYTOPLANKTON; NATURAL ASSEMBLAGES; LAKE MAARSSEVEEN; RUNNING WATERS; ALGAE; IRRADIANCE; ADAPTATION; CORAL; REED AB The photosynthesis-irradiance (P-I) relationship was examined in 10 intact periphyton communities from sites in eight streams that differed in ambient light, nutrient concentrations, and grazing pressure. Algal biomass ranged from 2.3 to 86-mu-g Chl a cm-2 and taxonomic composition differed. Photoassimilation of C-14 was measured in the laboratory at six light levels for each community. Photosynthesis by communities from shaded sites was photoinhibited at the highest light level. The light intensity at the onset of saturation (I(k)) was positively correlated (P less-than-or-equal-to 0.05) with ambient light, but ranged only from approximately 100 to 400-mu-mol m-2 s-1 among communities. Light-saturated, Chl-specific photosynthetic rates (PS(Chl)M) ranged from 0.26 to 1.4-mu-g C (mu-g Chl a)-1 h-1. The initial slope (alpha) of the P-I response ranged from 0.80 to 6.4-mu-g C (mg Chl a)-1 (mu-mol quanta)-1 m-2 s-1. Unlike phytoplankton, alpha and PS(M) (per unit Chl a) of the periphyton communities were not well related to the ambient light environment and tended to be lower for communities from high-light habitats. Further, the P-I responses of the communities were better related to periphyton biomass than to the light environment. Self-shading and other aspects of development in a matrix seem to be important determinants of periphyton P-I relationships. RP BOSTON, HL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 32 TC 113 Z9 116 U1 4 U2 25 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 JUN PY 1991 VL 36 IS 4 BP 644 EP 656 PG 13 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA GH839 UT WOS:A1991GH83900003 ER PT J AU DARSEY, JA NOID, DW WUNDERLICH, B TSOUKALAS, L AF DARSEY, JA NOID, DW WUNDERLICH, B TSOUKALAS, L TI NEURAL-NET EXTRAPOLATIONS OF HEAT-CAPACITIES OF POLYMERS TO LOW-TEMPERATURES SO MAKROMOLEKULARE CHEMIE-RAPID COMMUNICATIONS LA English DT Article C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. UNIV ARKANSAS,DEPT CHEM,LITTLE ROCK,AR 72204. NR 12 TC 13 Z9 13 U1 0 U2 0 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4 FX#001-41-61-317-94-11, CH-4052 BASEL, SWITZERLAND SN 0173-2803 J9 MAKROMOL CHEM-RAPID PD JUN PY 1991 VL 12 IS 6 BP 325 EP 330 PG 6 WC Polymer Science SC Polymer Science GA FW039 UT WOS:A1991FW03900005 ER PT J AU SUGAMA, T TAYLOR, C AF SUGAMA, T TAYLOR, C TI CHEMICAL DEGRADATIONS OF PYROGENIC POLYTITANOSILOXANE COATINGS SO MATERIALS LETTERS LA English DT Article AB We investigated the vulnerability of pyrogenic polytitanosiloxane (PTS) coatings to attack by 1.0 M NaOH and 1.0 M H2SO4 solutions. Exposure to NaOH caused breakage of the Si-O-Si bond, thereby producing water-soluble Na-related silicate and hydroxylated silicon compounds. The formation of such reaction products severely damaged the coatings. During treatment with H2SO4, SO4(2-) preferentially reacts with the TiO2 formed in PTS layers, rather than with the Si-O-Si and Si-O-Ti linkages. The formation of water-soluble titanium sulphate in this reaction led to pitting of the coatings. C1 UNIV VIRGINIA,DEPT CHEM,CHARLOTTESVILLE,VA 22901. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD JUN PY 1991 VL 11 IS 5-7 BP 187 EP 192 DI 10.1016/0167-577X(91)90078-K PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA FT898 UT WOS:A1991FT89800009 ER PT J AU HUGHES, DA HANSEN, N AF HUGHES, DA HANSEN, N TI MICROSTRUCTURAL EVOLUTION IN NICKEL DURING ROLLING AND TORSION SO MATERIALS SCIENCE AND TECHNOLOGY LA English DT Article ID COMMERCIALLY PURE NICKEL; SUBSTRUCTURAL EVOLUTION; ALUMINUM; COPPER; DEFORMATION AB Microstructural evolution in high purity nickel was investigated by comparing the dislocation substructures formed following torsion deformation with those following rolling. Results from transmission electron microscopy observations and measurements of microdiffraction show a common evolutionary path in rolling and torsion from (i) dislocation tangles to (ii) equiaxed cells bounded by dense dislocation walls (DDWs) which form cell blocks, then to (iii) microbands which together with DDWs, bound smaller and smaller cell blocks, and, finally, to (iv). During this evolution, grains are continually subdivided by the formation of new cell blocks. New cell blocks arise through the formation of new DDWs between cell blocks or of first generation microbands by the subdivision of a single DDW. Since the dislocation content of a microband is principally derived from that of the parent DDW, microbands can take various forms, such as a string of small pancake shaped cells in highly recovered DDWs, short double walls in discontinuous DDWs, or long paired dislocation sheets from continuous DDWs which can be very straight if formed close to {111} planes. At moderate strains and subsequent to microband formation, localised shear and shear offsets were observed in some first generation microbands. A few second generation microbands, in which localised shear is part of the formation process, were also observed. Localised shear was much more prevalent in rolling than in torsion. These results provide evidence for the theory that grains are divided into regions in which slightly different slip systems operate. Collectively, these regions provide evidence for strain accommodation, although in individual regions the number of slip systems is less than that required by the Taylor criterion. C1 RISO NATL LAB,DEPT MET,DK-4000 ROSKILDE,DENMARK. RP HUGHES, DA (reprint author), SANDIA NATL LABS,DEPT MAT,LIVERMORE,CA 94550, USA. NR 32 TC 75 Z9 76 U1 0 U2 13 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5DB SN 0267-0836 J9 MATER SCI TECH SER JI Mater. Sci. Technol. PD JUN PY 1991 VL 7 IS 6 BP 544 EP 553 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FV740 UT WOS:A1991FV74000011 ER PT J AU ATKINSON, C ENOMOTO, M MULLINS, WW TRIVEDI, R AF ATKINSON, C ENOMOTO, M MULLINS, WW TRIVEDI, R TI REPORT ON PANEL DISCUSSION .2. CRITICAL PROBLEMS IN THE MATHEMATICS OF LEDGEWISE GROWTH SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT SYMP AT THE 1989 FALL MEETING OF THE MINERALS, METALS, AND MATERIALS SOC AND THE AMERICAN SOC FOR METALS : THE ROLE OF LEDGES IN PHASE TRANSFORMATIONS CY OCT 01-05, 1989 CL INDIANAPOLIS, IN SP MINERALS, MET & MAT SOC, AMER SOC MET, MAT SCI DIV, PHASE TRANSFORMAT COMM C1 NATL RES INST MET,TOKYO 153,JAPAN. CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP ATKINSON, C (reprint author), UNIV LONDON IMPERIAL COLL SCI & TECHNOL,DEPT MATH,QUEENS GATE,LONDON SW7 2BZ,ENGLAND. OI Atkinson, Colin/0000-0002-8469-0875 NR 0 TC 4 Z9 4 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 JUN PY 1991 VL 22 IS 6 BP 1247 EP 1248 DI 10.1007/BF02660656 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA FQ387 UT WOS:A1991FQ38700013 ER PT J AU FABIETTI, LM TRIVEDI, R AF FABIETTI, LM TRIVEDI, R TI NONEQUILIBRIUM EFFECTS DURING THE LEDGEWISE GROWTH OF A SOLID-LIQUID INTERFACE SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT SYMP AT THE 1989 FALL MEETING OF THE MINERALS, METALS, AND MATERIALS SOC AND THE AMERICAN SOC FOR METALS : THE ROLE OF LEDGES IN PHASE TRANSFORMATIONS CY OCT 01-05, 1989 CL INDIANAPOLIS, IN SP MINERALS, MET & MAT SOC, AMER SOC MET, MAT SCI DIV, PHASE TRANSFORMAT COMM ID DIRECTIONAL SOLIDIFICATION AB Directional solidification studies have been carried out in the napthalene-camphor system in which the interface advances through the formation and motion of ledges. Growth conditions have been varied so as to characterize both the planar interface growth and the conditions for the instability of the planar interface. It is found that the mechanisms of planar interface instability and the subsequent morphological development of the interface depend significantly on the crystallographic orientation of the interface. Appreciable interface kinetics effects are present during the growth of a planar interface, and experimental studies have been designed to quantitatively evaluate the nonequilibrium conditions at the interface. These nonequilibrium effects for the napthalene-camphor system have been determined experimentally and have been characterized by two response functions that describe the interface temperature and the interface composition in the liquid under nonequilibrium conditions. The interface kinetic law is found to be exponential, indicating that the growth of the interface occurs through the process of nucleation of new layers. C1 AMES LAB,MAT SCI & ENGN,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. NR 18 TC 14 Z9 14 U1 0 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD JUN PY 1991 VL 22 IS 6 BP 1249 EP 1258 DI 10.1007/BF02660657 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA FQ387 UT WOS:A1991FQ38700014 ER PT J AU GILMAN, JJ AF GILMAN, JJ TI HUMBUG, CHICKWEED, AND RESEARCH FUNDS DISTRIBUTION SO MRS BULLETIN LA English DT Letter RP GILMAN, JJ (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 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 JUN PY 1991 VL 16 IS 6 BP 4 EP 4 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA FQ386 UT WOS:A1991FQ38600002 ER PT J AU BAK, P CREUTZ, M AF BAK, P CREUTZ, M TI DYNAMICS OF SAND SO MRS BULLETIN LA English DT Article RP BAK, P (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 4 Z9 4 U1 1 U2 4 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 JUN PY 1991 VL 16 IS 6 BP 17 EP 21 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA FQ386 UT WOS:A1991FQ38600005 ER PT J AU EDWARDS, NT AF EDWARDS, NT TI ROOT AND SOIL RESPIRATION RESPONSES TO OZONE IN PINUS-TAEDA L SEEDLINGS SO NEW PHYTOLOGIST LA English DT Article DE ROOT RESPIRATION; SOIL RESPIRATION; OZONE; OPEN-TOP CHAMBERS; PINUS-TAEDA ID PHASEOLUS-VULGARIS L; MEMBRANE-PERMEABILITY; GROWTH-RESPONSE; PLANTS; PHOTOSYNTHATE; COMBINATION; ALLOCATION; PATTERNS; EXPOSURE; RAIN AB Respiration rates of roots of loblolly pine (Pinus taeda L.) seedlings decreased in response to elevated ozone (O3) concentrations. Estimated annual root respiration rates were 12% less in seedlings exposed to twice-ambient O3 (7 h mean = 70-110 nl 1-1) than in seedlings exposed to sub-ambient O3 (7 h mean = 20-40 nl 1-1). Measurements taken during periods of relatively rapid and of negligible root growth suggest that the reduced root respiration may be due to both reduced maintenance respiration and reduced growth respiration. Respiration rates of the soil substrate of the O3-exposed seedlings were also below those of the substrate of seedlings exposed to sub-ambient O3. The study supports the theory that there is a reduced supply of photosynthates to the roots of plants exposed to elevated O3. It is hypothesized that a reduced supply of photosynthates to the roots may affect soil respiration rates by reducing root exudation rates and, consequently, reducing rhizosphere microbial populations. RP EDWARDS, NT (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 24 TC 62 Z9 88 U1 1 U2 16 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0028-646X J9 NEW PHYTOL JI New Phytol. PD JUN PY 1991 VL 118 IS 2 BP 315 EP 321 DI 10.1111/j.1469-8137.1991.tb00983.x PG 7 WC Plant Sciences SC Plant Sciences GA FU577 UT WOS:A1991FU57700010 ER PT J AU SEIDENSTICKER, RW AF SEIDENSTICKER, RW TI APPLICABILITY OF BASE-ISOLATION RES-AND-DEV IN NON-REACTOR FACILITIES TO A NUCLEAR-REACTOR PLANT SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL SEMINAR ON SEISMIC BASE ISOLATION OF NUCLEAR POWER FACILITIES / 10TH INTERNATIONAL CONF ON STRUCTURAL MECHANICS IN REACTOR TECHNOLOGY ( SMIRT 10 ) CY AUG 21-22, 1989 CL SAN FRANCISCO, CA AB Seismic isolation is gaining increased attention worldwide for use in a wide spectrum of critical facilities, ranging from hospitals and computing centers to nuclear power plants. The level of assurance of performance for such isolation systems for a nuclear power plant will be much greater than that required for non-nuclear facilities. The question is to what extent can R & D for non-nuclear use of seismic isolation be applied to a nuclear power plant. Experience shows that considerable effort is needed to adapt any technology to nuclear power facilities. This paper reviews the R & D programs ongoing for seismic isolation in non-nuclear facilities and related experience and makes a preliminary assessment of the extent to which such R & D and experience can be used for nuclear power plant application. Ways are suggested to improve the usefulness of such non-nuclear R & D in providing the high level of confidence required for the use of seismic isolation in a nuclear reactor plant. RP SEIDENSTICKER, RW (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1991 VL 127 IS 3 BP 291 EP 293 DI 10.1016/0029-5493(91)90053-K PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GB832 UT WOS:A1991GB83200008 ER PT J AU KULAK, RF WANG, CY AF KULAK, RF WANG, CY TI DESIGN AND ANALYSIS OF SEISMICALLY ISOLATED STRUCTURES SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL SEMINAR ON SEISMIC BASE ISOLATION OF NUCLEAR POWER FACILITIES / 10TH INTERNATIONAL CONF ON STRUCTURAL MECHANICS IN REACTOR TECHNOLOGY ( SMIRT 10 ) CY AUG 21-22, 1989 CL SAN FRANCISCO, CA ID ELEMENT AB This paper describes developing methodology for performing three-dimensional (3D) analysis of individual seismic bearings and for simulating the 3D system response of isolated reactor structures (superstructure, isolators, basemats, etc.) including the surrounding soil under earthquake excitation. In addition, programs for elastomer research and quality control are discussed. Several sample problems are presented to illustrate the 3D capability. RP KULAK, RF (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 11 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 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1991 VL 127 IS 3 BP 419 EP 432 DI 10.1016/0029-5493(91)90065-P PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GB832 UT WOS:A1991GB83200020 ER PT J AU CORBETT, WJ CONN, RW GOEBEL, DM MOYER, RA DIPPEL, KH FINKEN, KH REITER, D GAUSTER, WB MALINOWSKI, ME MCGRATH, RT MIYAHARA, A SAGARA, A WATKINS, JG WOLF, GH AF CORBETT, WJ CONN, RW GOEBEL, DM MOYER, RA DIPPEL, KH FINKEN, KH REITER, D GAUSTER, WB MALINOWSKI, ME MCGRATH, RT MIYAHARA, A SAGARA, A WATKINS, JG WOLF, GH TI TOROIDAL PUMP LIMITER EXPERIMENTS IN THE TEXTOR TOKAMAK SO NUCLEAR FUSION LA English DT Article ID ALT-II; PLASMA; ICRF AB The Advanced Limiter Test-II (ALT-II) is a large area toroidal pump limiter in the TEXTOR tokamak. Discrete target plates located in channels at eight toroidal positions behind the main limiter surface neutralize a portion of the plasma efflux from the core. The resulting gas is exhausted by eight external pumps. The primary experimental goals of ALT-II are aimed at power loading studies and plasma density control during long pulse (4 s), high power (6 MW) tokamak discharges. It is found that both the power and the plasma flow to the limiter are asymmetric and depend on line density. Peak neutral pressures of 0.8 m torr and removal rates of up to 0.15 torr.L/s per pump station are achieved in the Ohmic phase. The projected exhaust efficiency of ALT-II with full pumping is 5-10%. During ion cyclotron resonance frequency heating, the particle removal rate exceeds 0.4 torr.L/s per blade, and the exhaust efficiency is 4-5% for power levels up to 2.6 MW. C1 UNIV CALIF LOS ANGELES, INST PLASMA & FUS RES, LOS ANGELES, CA 90024 USA. NAGOYA UNIV, NATL INST FUS SCI, NAGOYA, AICHI 464, JAPAN. EURATOM, ECOLE ROYALE MIL, PHYS PLASMAS LAB, B-1040 BRUSSELS, BELGIUM. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. SANDIA NATL LABS, LIVERMORE, CA 94550 USA. UNIV CALIF LOS ANGELES, DEPT MECH AEROSP NUCL ENGN, LOS ANGELES, CA 90024 USA. RP CORBETT, WJ (reprint author), FORSCHUNGSZENTRUM JULICH, ASSOC EURATOM KFA, FORSCHUNGSZENTRUM JULICH, INST PLASMAPHYS, W-5170 JULICH 1, GERMANY. NR 47 TC 10 Z9 10 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUN PY 1991 VL 31 IS 6 BP 1067 EP 1077 DI 10.1088/0029-5515/31/6/005 PG 11 WC Physics, Fluids & Plasmas SC Physics GA FV601 UT WOS:A1991FV60100005 ER PT J AU HARRIS, JH BELL, JD DUNLAP, JL PARE, VK BELL, GL BIGELOW, TS ENGLAND, AC GLOWIENKA, JC HORTON, LD HOWE, HC ISLER, RC MENON, MM MURAKAMI, M MORRIS, RN NEILSON, GH RASMUSSEN, DA WILGEN, JB WING, WR AF HARRIS, JH BELL, JD DUNLAP, JL PARE, VK BELL, GL BIGELOW, TS ENGLAND, AC GLOWIENKA, JC HORTON, LD HOWE, HC ISLER, RC MENON, MM MURAKAMI, M MORRIS, RN NEILSON, GH RASMUSSEN, DA WILGEN, JB WING, WR TI MAGNETIC FLUCTUATIONS IN CURRENTLESS PLASMAS IN THE ATF TORSATRON SO NUCLEAR FUSION LA English DT Article ID HIGH-BETA; 2ND STABILITY; HELIOTRON-E; TOKAMAK; CONFINEMENT; EQUILIBRIUM; MODES AB Measurements of poloidal magnetic field fluctuations outside currentless, finite-beta ( less-than-or-equal-to 0.5%, beta-0 less-than-or-equal-to 3%) plasmas with peaked pressure profiles in the Advanced Toroidal Facility (ATF) torsatron reveal bands of small (B approximately-theta/B-phi approximately 10(-5), coherent fluctuations in the frequency range 5-60 kHz. The geometrical structure of these fluctuations shows n = 1 toroidal mode symmetry, with inferred poloidal mode numbers of m = 2 and 3. The coherent B approximately-theta amplitudes increase with for less-than-or-similar-to 0.3%, and then saturate and begin to decrease with for greater-than-or-similar-to 0.3%. C1 MARTIN MARIETTA ENERGY SYST INC,DIV COMP & TELECOMMUN,OAK RIDGE,TN 37831. RP HARRIS, JH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI Morris, Robert/0000-0001-7192-7733; Isler, Ralph/0000-0002-5368-7200 NR 27 TC 2 Z9 2 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5 PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUN PY 1991 VL 31 IS 6 BP 1099 EP 1106 DI 10.1088/0029-5515/31/6/007 PG 8 WC Physics, Fluids & Plasmas SC Physics GA FV601 UT WOS:A1991FV60100007 ER PT J AU HOLMES, R KIM, DH KUMAR, KS SOUDER, PA BENTON, D CATES, GD NEWBURY, N PILLAI, C AF HOLMES, R KIM, DH KUMAR, KS SOUDER, PA BENTON, D CATES, GD NEWBURY, N PILLAI, C TI OPERATION OF THE LAMPF STOPPED MUON CHANNEL FOR SMALL GAS TARGETS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DENSITY; NUCLEI; ATOMS; BEAM; SPIN AB We describe the operation of the LAMPF stopped muon channel (SMC) in a mode that provides a small beam spot and a narrow momentum spread suitable for stopping negative muons in presently available optically pumped spin-exchange polarized gas targets. This technique is expected to be useful for the production of polarized muonic atoms. Monte Carlo studies of the channel are discussed, and we describe experimental results including measurements of the fraction of negative muon stops in a 6 cm3 krypton target at 1 atm as a function of beam momentum. C1 PRINCETON UNIV,PRINCETON,NJ 08544. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP HOLMES, R (reprint author), SYRACUSE UNIV,SYRACUSE,NY 13210, USA. NR 22 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 JUN 1 PY 1991 VL 303 IS 2 BP 226 EP 232 DI 10.1016/0168-9002(91)90792-O PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR965 UT WOS:A1991FR96500003 ER PT J AU Aarnio, P Abie, H Abreu, P Adam, W Adrianos, P Adye, T Akopdzhanov, G Alekseev, GD Algostino, G Allaby, JV Allen, P Allport, P Almehed, S Almeida, T Alvsvaag, SJ Amaldi, U Ambec, I Amery, A Anassontzis, E Antilogus, P Apel, WD Aria, E Astesan, F Aubret, C Augustin, JE Augustinus, A Baillon, P Barao, F Barbiellini, G Barichello, G Barlag, S Barlow, J Baroncelli, A Barranco-Luque, M Barreira, G Barring, O Bartl, W Battaiotto, P Baubillier, M Baudoin, C Beadle, N Becks, KH Bell, W Beltran, P Benlloch, JM Berggren, M Berglund, S Berst, JD Bertolino, F Biagi, S Bianchi, F Bibby, JH Bingefors, N Bjarne, J Bloch, D Bogolubov, PN Bollini, D Bolognese, T Bonierbale, P Booth, PSL Boratav, M Borgeaud, P Borner, H Bosio, C Botner, O Bouquet, B Boutonnet, C Bovo, G Bozzo, M Branchini, P Brand, C Brand, KD Bricman, C Brown, RCA Brunet, JM Bugge, L Buran, T Burmeister, H Buttar, C Buytaert, JAMA Cabras, G Caccia, M Cairanti, S Calvi, M Rozas, AJC Campagne, JE Campion, A Camporesi, T Canale, V Carling, H Carniel, R Carroll, L Caso, C Castelli, E Gimenez, MV Cataneo, F Cattai, A Cavallo, FR Cerrito, L Chadwick, G Charpentier, P Checchia, P Chelkov, GA Chevalier, L Chiccoli, C Chignoli, F Chliapnikov, P Chorowicz, V Christophel, E Cirio, R Colilli, S Colledani, C Conforti, F Contri, R Cooke, PA Couchot, F Courty, P Cozza, C Crawley, HB Crennell, D Cresti, M Croissiaux, M Crosetti, G Crosetto, D Crosland, N Crozon, M Maestro, JC Curwen, LS Czellar, S Dahl-Jensen, E Dalmagne, B Dam, M Dam, P Damgaard, G Darbo, G Daubie, E Daum, A Davenport, M De Angelis, A De Beer, M De Clercq, C De Koning, N De La Vaissiere, C Defontaines, F Degli Esposti, F Delikaris, D Delpierre, P Denisov, YN Di Ciaccio, L Di Pietro, S Diaczek, A Diddens, AN Dijkstra, H Dimitriou, N Dolbeau, J Donszelmann, M Doroba, K Downs, R Dracos, M Drees, J Dris, M Du, S Dudragne, N Dulinski, W Dzhelyadin, R Eek, LO Eerola, PAM Eilertsen, K Ekelhof, T Ellila, M Engel, JP Etienne, L Evers, GJ Every, R Falaleev, V Fenyuk, A Alonso, MF Ferrer, A Ferr, I Ferroni, S Fialovski, B Filippas, TA Firestone, A Fischer, HG Fischer, R Fjeld, B Flinn, M Floom, G Foeth, H Fokitis, E Folegati, P Fontanelli, F Forsbach, H Fraissard, D Franek, B Fransson, KE Fratnik, F Fries, DC Froberger, JP Frodesen, AG Fruhwirth, R Fulda-Quenzer, F Fuster, J Gago, JM Gaillard, M Galeazzi, G Gamba, D Garat, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gawne, S Gazis, EN Genat, JF Gerdyukov, L Giordano, V Glitza, KW Gokieli, R Golovatyuk, VM Gomes, P Goobar, A Goorens, R Gopal, G Gorbics, M Goret, B Gorski, M Goujon, G Gracco, V Grant, A Grard, F Graziani, E Greggio, G Grillet, JP Gros, MH Gros, M Grosdidier, G Grossetete, B Grung, B Guglielmi, L Guy, J Guzik, Z Gygi, E Hahn, F Hahn, M Haider, S Haissinski, J Hajduk, Z Hakansson, A Hallgren, A Hamacher, K De Monchenault, GH Harris, FJ Hartjes, F Heck, B Hellberg, K Herbst, I Herr, H Higon, E Hilke, HJ Hofmann, H Hofmokl, T Holm, R Holmes, R Holmgren, SO Homer, J Hooper, JE Horisberger, R Houlden, M Hrisoho, A Hrubec, J Hubbeling, L Huitu, K Hultqvist, K Husson, D Hyams, BD Illinger, C Imbault, D Ioannou, P Iversen, PS Jackson, JN Jacob, F Jaeger, JJ Jalocha, P Janczur, W Jansen, H Jarlskog, G Jarry, P Jean-Marie, B Joensuu, J Johansson, EK Johansson, H Jonker, M Juillot, P Kadyrov, RB Kaeck, S Kaetanowicz, M Kalkanis, G Kalmus, G Kantardjian, G Kapusta, P Katsanevas, S Katsoufis, EC Keranen, R Kersten, S Kesteman, J Khomenko, BA Khovansky, NN Kindblom, P King, B Kisielewski, B Klempt, W Klovning, A Koene, B Kok, J Kokkinias, P Kontaxis, I Kopf, M Koponen, J Korcyl, K Kornelis, Y Korporaal, A Korytov, AV Kostarakis, P Kourkoumelis, C Kreuzberger, T Krolikowski, J Kucewicz, W Kuhn, G Kulinich, P Kulka, K Kurvinen, K Laakso, MI Lambropoulos, C Lamsa, JW Lanceri, L Langerveld, D Lapin, V Laugier, JP Lauhakangas, R Laurenti, G Laurikainen, P Lavigne, B Le Grand, JC Lebbolo, H Lebee, G Leder, G Lemonne, J Lenzen, G Leoni, R Lepeltier, V Lewandowski, M Lidbury, JA Lillestol, E Lillethun, E Lindqvist, LE Lippi, I Lokajicek, M Loken, JG Lomoro, R Aguera, MAL Lorenz, P Loukas, D Lucock, R Lund-Jensen, B Lundberg, B Lyons, L Maehlum, G Maeland, O Maillet, O Maltezos, S Mandl, F Marco, J Markou, A Maltezos, A Martinez, I Mas, J Mathis, L Matteuzzi, C Matthiae, G Mattsson, L Matyushevski, EA Mayet, N Mazza, R Mazzucato, M Mc Cubbin, M McKay, R Menichetti, E Meroni, C Meyer, WT Michalowski, J Mielke, HH Mitaroff, WA Mitselmakher, GV Mjoernmark, U Moeller, R Moenig, K Molinari, G Monge, MR Montano, F Moreau, P Morelli, A Morettini, P Moyssides, PG Mueller, H Muller, H Mur, M Murzeau, E Myatt, G Navarria, FL Nawrot, A Negri, P Nielsen, BS Nigro, M Nonni, M Noppe, JM Nordberg, M Nounos, S Obraztsov, V Odegaard, T Olchevski, A Oppermann, M Orava, R Orme, E Oswald, R Ouraou, A Paccagnella, G Pagot, J Pain, R Pakonski, K Palermo, S Lopes, SP Papadopoulou, T Pape, L Pasini, P Passeneau, J Passeneau, M Passeri, A Pattison, JB Paul, B Pegoraro, M Perez, J Pernicka, M Petrucci, G Pettersen, T Pimenta, M Pingot, O Pinori, C Pinsent, A Piovan, O Poiret, C Pol, ME Poliakov, B Polok, G Poropat, P Poutot, D Privitera, P Pullia, A Pyyhtia, J Queru, P Quinton, S Rademakers, AA Radojicic, D Ragazzi, S Ragazzon, R Rampazzo, G Ranelli, G Range, WH Raoul, JC Ratoff, PN Read, AL Redaelli, NG Regler, M Reid, D Reis, MV Renton, PB Resvanis, LK Rewiersma, P Riadovikov, V Richard, F Ridky, J Rinaudo, G Roditi, I Romaya, AM Romero, A Ronchese, P Rongved, R Rosenberg, EI Rossel, F Rossi, S Rosso, E Roudeau, P Rovelli, T Ruhlmann, V Ruiz, A Ryabtsov, VI Rypko, J Ryzhov, VN Saarikko, H Sacco, D Sacquin, Y Sadovsky, AB Saget, G Salt, J Sanchez, E Sanchis, E Sannino, M Sanny, B Saragas, E Schaeffer, M Schneider, F Schneider, H Scuri, F Sebastia, A Sedykh, YV Segar, AM Sekulin, R Seller, P Sessa, M Seufert, R Siegrist, P Silva, C Silvestre, E Simonetti, S Simonetto, F Skaali, TB Skeens, J Smadja, G Smith, GR Smith, NA Sokos, A Sosnowski, R Spang, K Spassoff, TS Spedini, M Spentzouris, P Spiriti, E Squarcia, S Stanescu, C Stavropoulos, G Stevens, R Stichelbaut, F Stocchi, A Strauss, J Strom, S Sundell, E Szczekowski, M Szeptycka, M Szymanski, P Tarjan, J Tavernier, S Thadome, J Theodosiou, G Thollander, L Thomas, WD Thornhill, J Thorsteinsen, P Tilquin, A Timmermans, J Timofeev, VG Tkatchev, LG Todorov, T Toet, DZ Tokmenin, V Topp-Jorgensen, S Topphol, AK Tortora, L Trapani, P Traspedini, L Treille, D Trevisan, U Tripodi, G Tristram, G Troncon, C Truong, TK Tsirou, A Tsyganov, EN Turala, M Turchetta, R Turlot, JP Turluer, ML Turner, P Tuuva, T Tyapkin, IA Tyndel, M Udo, F Ullaland, O Valenti, G Van Apeldoorn, GW Van Beek, G Van Dam, P Van Doninck, WK Van Eijk, B Van Eijndhoven, N Van Lancker, L Vander Velde, C Vanuxem, JP Varela, J Vasilenko, AT Vaz, P Veccia, C Vegni, G Vehvilainen, T Veitch, ME Velasco, J Veneroni, P Ventura, L Venus, W Vergezac, P Vergne, J Vernocchi, F Vertogradov, LS Vilanova, D Vink, H Melo, LV Vodopyanov, AS Vollmer, M Voulgaris, G Voutilainen, M Vrba, V Wahlen, H Waldner, F Wayne, M Weilhammer, P Werner, C Werner, J Wetherell, AM Wickens, JH Wikne, J Wilhelmsen, E Wilkinson, L Williams, MT Williams, WSC Witt, BH Wormald, D Wormser, G Woschnagg, K Xyroutsikos, A Yamdagni, N Yelton, J Zaitsev, A Zalewska, A Zalewski, P Zarubin, PI Zevgolatakos, E Zimin, NI Zinchenko, AI Zito, M Zitoun, R Zonca, E Zotov, A Zucchini, A Zumerle, G AF Aarnio, P Abie, H Abreu, P Adam, W Adrianos, P Adye, T Akopdzhanov, G Alekseev, GD Algostino, G Allaby, JV Allen, P Allport, P Almehed, S Almeida, T Alvsvaag, SJ Amaldi, U Ambec, I Amery, A Anassontzis, E Antilogus, P Apel, WD Aria, E Astesan, F Aubret, C Augustin, JE Augustinus, A Baillon, P Barao, F Barbiellini, G Barichello, G Barlag, S Barlow, J Baroncelli, A Barranco-Luque, M Barreira, G Barring, O Bartl, W Battaiotto, P Baubillier, M Baudoin, C Beadle, N Becks, KH Bell, W Beltran, P Benlloch, JM Berggren, M Berglund, S Berst, JD Bertolino, F Biagi, S Bianchi, F Bibby, JH Bingefors, N Bjarne, J Bloch, D Bogolubov, PN Bollini, D Bolognese, T Bonierbale, P Booth, PSL Boratav, M Borgeaud, P Borner, H Bosio, C Botner, O Bouquet, B Boutonnet, C Bovo, G Bozzo, M Branchini, P Brand, C Brand, KD Bricman, C Brown, RCA Brunet, JM Bugge, L Buran, T Burmeister, H Buttar, C Buytaert, JAMA Cabras, G Caccia, M Cairanti, S Calvi, M Rozas, AJC Campagne, JE Campion, A Camporesi, T Canale, V Carling, H Carniel, R Carroll, L Caso, C Castelli, E Gimenez, MV Cataneo, F Cattai, A Cavallo, FR Cerrito, L Chadwick, G Charpentier, P Checchia, P Chelkov, GA Chevalier, L Chiccoli, C Chignoli, F Chliapnikov, P Chorowicz, V Christophel, E Cirio, R Colilli, S Colledani, C Conforti, F Contri, R Cooke, PA Couchot, F Courty, P Cozza, C Crawley, HB Crennell, D Cresti, M Croissiaux, M Crosetti, G Crosetto, D Crosland, N Crozon, M Maestro, JC Curwen, LS Czellar, S Dahl-Jensen, E Dalmagne, B Dam, M Dam, P Damgaard, G Darbo, G Daubie, E Daum, A Davenport, M De Angelis, A De Beer, M De Clercq, C De Koning, N De La Vaissiere, C Defontaines, F Degli Esposti, F Delikaris, D Delpierre, P Denisov, YN Di Ciaccio, L Di Pietro, S Diaczek, A Diddens, AN Dijkstra, H Dimitriou, N Dolbeau, J Donszelmann, M Doroba, K Downs, R Dracos, M Drees, J Dris, M Du, S Dudragne, N Dulinski, W Dzhelyadin, R Eek, LO Eerola, PAM Eilertsen, K Ekelhof, T Ellila, M Engel, JP Etienne, L Evers, GJ Every, R Falaleev, V Fenyuk, A Alonso, MF Ferrer, A Ferr, I Ferroni, S Fialovski, B Filippas, TA Firestone, A Fischer, HG Fischer, R Fjeld, B Flinn, M Floom, G Foeth, H Fokitis, E Folegati, P Fontanelli, F Forsbach, H Fraissard, D Franek, B Fransson, KE Fratnik, F Fries, DC Froberger, JP Frodesen, AG Fruhwirth, R Fulda-Quenzer, F Fuster, J Gago, JM Gaillard, M Galeazzi, G Gamba, D Garat, C Garcia, J Gaspar, C Gasparini, U Gavillet, P Gawne, S Gazis, EN Genat, JF Gerdyukov, L Giordano, V Glitza, KW Gokieli, R Golovatyuk, VM Gomes, P Goobar, A Goorens, R Gopal, G Gorbics, M Goret, B Gorski, M Goujon, G Gracco, V Grant, A Grard, F Graziani, E Greggio, G Grillet, JP Gros, MH Gros, M Grosdidier, G Grossetete, B Grung, B Guglielmi, L Guy, J Guzik, Z Gygi, E Hahn, F Hahn, M Haider, S Haissinski, J Hajduk, Z Hakansson, A Hallgren, A Hamacher, K De Monchenault, GH Harris, FJ Hartjes, F Heck, B Hellberg, K Herbst, I Herr, H Higon, E Hilke, HJ Hofmann, H Hofmokl, T Holm, R Holmes, R Holmgren, SO Homer, J Hooper, JE Horisberger, R Houlden, M Hrisoho, A Hrubec, J Hubbeling, L Huitu, K Hultqvist, K Husson, D Hyams, BD Illinger, C Imbault, D Ioannou, P Iversen, PS Jackson, JN Jacob, F Jaeger, JJ Jalocha, P Janczur, W Jansen, H Jarlskog, G Jarry, P Jean-Marie, B Joensuu, J Johansson, EK Johansson, H Jonker, M Juillot, P Kadyrov, RB Kaeck, S Kaetanowicz, M Kalkanis, G Kalmus, G Kantardjian, G Kapusta, P Katsanevas, S Katsoufis, EC Keranen, R Kersten, S Kesteman, J Khomenko, BA Khovansky, NN Kindblom, P King, B Kisielewski, B Klempt, W Klovning, A Koene, B Kok, J Kokkinias, P Kontaxis, I Kopf, M Koponen, J Korcyl, K Kornelis, Y Korporaal, A Korytov, AV Kostarakis, P Kourkoumelis, C Kreuzberger, T Krolikowski, J Kucewicz, W Kuhn, G Kulinich, P Kulka, K Kurvinen, K Laakso, MI Lambropoulos, C Lamsa, JW Lanceri, L Langerveld, D Lapin, V Laugier, JP Lauhakangas, R Laurenti, G Laurikainen, P Lavigne, B Le Grand, JC Lebbolo, H Lebee, G Leder, G Lemonne, J Lenzen, G Leoni, R Lepeltier, V Lewandowski, M Lidbury, JA Lillestol, E Lillethun, E Lindqvist, LE Lippi, I Lokajicek, M Loken, JG Lomoro, R Aguera, MAL Lorenz, P Loukas, D Lucock, R Lund-Jensen, B Lundberg, B Lyons, L Maehlum, G Maeland, O Maillet, O Maltezos, S Mandl, F Marco, J Markou, A Maltezos, A Martinez, I Mas, J Mathis, L Matteuzzi, C Matthiae, G Mattsson, L Matyushevski, EA Mayet, N Mazza, R Mazzucato, M Mc Cubbin, M McKay, R Menichetti, E Meroni, C Meyer, WT Michalowski, J Mielke, HH Mitaroff, WA Mitselmakher, GV Mjoernmark, U Moeller, R Moenig, K Molinari, G Monge, MR Montano, F Moreau, P Morelli, A Morettini, P Moyssides, PG Mueller, H Muller, H Mur, M Murzeau, E Myatt, G Navarria, FL Nawrot, A Negri, P Nielsen, BS Nigro, M Nonni, M Noppe, JM Nordberg, M Nounos, S Obraztsov, V Odegaard, T Olchevski, A Oppermann, M Orava, R Orme, E Oswald, R Ouraou, A Paccagnella, G Pagot, J Pain, R Pakonski, K Palermo, S Lopes, SP Papadopoulou, T Pape, L Pasini, P Passeneau, J Passeneau, M Passeri, A Pattison, JB Paul, B Pegoraro, M Perez, J Pernicka, M Petrucci, G Pettersen, T Pimenta, M Pingot, O Pinori, C Pinsent, A Piovan, O Poiret, C Pol, ME Poliakov, B Polok, G Poropat, P Poutot, D Privitera, P Pullia, A Pyyhtia, J Queru, P Quinton, S Rademakers, AA Radojicic, D Ragazzi, S Ragazzon, R Rampazzo, G Ranelli, G Range, WH Raoul, JC Ratoff, PN Read, AL Redaelli, NG Regler, M Reid, D Reis, MV Renton, PB Resvanis, LK Rewiersma, P Riadovikov, V Richard, F Ridky, J Rinaudo, G Roditi, I Romaya, AM Romero, A Ronchese, P Rongved, R Rosenberg, EI Rossel, F Rossi, S Rosso, E Roudeau, P Rovelli, T Ruhlmann, V Ruiz, A Ryabtsov, VI Rypko, J Ryzhov, VN Saarikko, H Sacco, D Sacquin, Y Sadovsky, AB Saget, G Salt, J Sanchez, E Sanchis, E Sannino, M Sanny, B Saragas, E Schaeffer, M Schneider, F Schneider, H Scuri, F Sebastia, A Sedykh, YV Segar, AM Sekulin, R Seller, P Sessa, M Seufert, R Siegrist, P Silva, C Silvestre, E Simonetti, S Simonetto, F Skaali, TB Skeens, J Smadja, G Smith, GR Smith, NA Sokos, A Sosnowski, R Spang, K Spassoff, TS Spedini, M Spentzouris, P Spiriti, E Squarcia, S Stanescu, C Stavropoulos, G Stevens, R Stichelbaut, F Stocchi, A Strauss, J Strom, S Sundell, E Szczekowski, M Szeptycka, M Szymanski, P Tarjan, J Tavernier, S Thadome, J Theodosiou, G Thollander, L Thomas, WD Thornhill, J Thorsteinsen, P Tilquin, A Timmermans, J Timofeev, VG Tkatchev, LG Todorov, T Toet, DZ Tokmenin, V Topp-Jorgensen, S Topphol, AK Tortora, L Trapani, P Traspedini, L Treille, D Trevisan, U Tripodi, G Tristram, G Troncon, C Truong, TK Tsirou, A Tsyganov, EN Turala, M Turchetta, R Turlot, JP Turluer, ML Turner, P Tuuva, T Tyapkin, IA Tyndel, M Udo, F Ullaland, O Valenti, G Van Apeldoorn, GW Van Beek, G Van Dam, P Van Doninck, WK Van Eijk, B Van Eijndhoven, N Van Lancker, L Vander Velde, C Vanuxem, JP Varela, J Vasilenko, AT Vaz, P Veccia, C Vegni, G Vehvilainen, T Veitch, ME Velasco, J Veneroni, P Ventura, L Venus, W Vergezac, P Vergne, J Vernocchi, F Vertogradov, LS Vilanova, D Vink, H Melo, LV Vodopyanov, AS Vollmer, M Voulgaris, G Voutilainen, M Vrba, V Wahlen, H Waldner, F Wayne, M Weilhammer, P Werner, C Werner, J Wetherell, AM Wickens, JH Wikne, J Wilhelmsen, E Wilkinson, L Williams, MT Williams, WSC Witt, BH Wormald, D Wormser, G Woschnagg, K Xyroutsikos, A Yamdagni, N Yelton, J Zaitsev, A Zalewska, A Zalewski, P Zarubin, PI Zevgolatakos, E Zimin, NI Zinchenko, AI Zito, M Zitoun, R Zonca, E Zotov, A Zucchini, A Zumerle, G CA DELPHI Collaboration TI THE DELPHI DETECTOR AT LEP SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DENSITY PROJECTION CHAMBER; BARREL RICH DETECTOR; LEAD-GLASS CALORIMETER; LIMITED STREAMER MODE; DRIFT CHAMBERS; DELAY-LINES; TIME; PERFORMANCE; PROTOTYPE; GAS AB DELPHI is a 4-pi detector with emphasis on particle identification, three-dimensional information, high granularity and precise vertex determination. The design criteria, the construction of the detector and the performance during the first year of operation at the large electron positron collider (LEP) at CERN are described. C1 Iowa State Univ, Dept Phys, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Univ Instelling Antwerp, Dept Phys, B-2610 Wilrijk, BELGIUM. ULB VUB, IIHE, B-1050 Brussels, BELGIUM. Univ Etat Mons, Serv Phys Part Elem, Fac Sci, B-7000 Mons, BELGIUM. Univ Athens, Phys Lab, GR-10680 Athens, GREECE. Univ Bergen, Dept Phys, N-5007 Bergen, NORWAY. Univ Bologna, Dipartimento Fis, I-40126 Bologna, ITALY. Ist Nazl Fis Nucl, I-40126 Bologna, ITALY. Coll France, Lab Phys corpusculaire, F-75231 Paris 05, FRANCE. CERN, CH-1211 Geneva 23, SWITZERLAND. Grp DELPHI, CRN, Div Hautes Energies, F-67037 Strasbourg, FRANCE. Grp LEPSI, CRN, Div Hautes Energies, F-67037 Strasbourg, FRANCE. Greek Atom Energy Commiss, Nucl Res Ctr Demokritos, GR-15310 Aghia Paraskevi, GREECE. Ist Nazl Fis Nucl, I-16146 Genoa, ITALY. 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CEN Saclay, DPhPE, F-91191 Gif Sur Yvette, FRANCE. Ist Nazl Fis Nucl, Ist Super Sanita, I-00161 Rome, ITALY. Univ Rome 2, Dipartimento Fis, I-00173 Rome, ITALY. Ist Nazl Fis Nucl, I-00173 Rome, ITALY. Univ Santander, Fac Ciencias, E-39005 Santander, SPAIN. Inst High Energy Phys, Protvino, RUSSIA. Univ Stockholm, Inst Phys, S-11346 Stockholm, SWEDEN. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, ITALY. Ist Nazl Fis Nucl, I-10125 Turin, ITALY. Univ Trieste, Dipartimento Fis, I-34127 Trieste, ITALY. Ist Nazl Fis Nucl, I-34127 Trieste, ITALY. Univ Udine, Ist Fis, I-33100 Udine, ITALY. Univ Uppsala, Dept Radiat Sci, S-75121 Uppsala, SWEDEN. Ctr Mixto Univ Valencia CSIC, Inst Fis Corpuscular IFIC, E-46100 Burjassot, SPAIN. Oesterreich Akad Wissensch, Inst Hochenergiephys, A-1050 Vienna, AUSTRIA. Univ Warsaw, Inst Nucl Studies, PL-99681 Warsaw, POLAND. Univ Wuppertal, Fachbereich Phys, D-5600 Wuppertal 1, GERMANY. RP Aarnio, P (reprint author), Univ Helsinki, Dept High Energy Phys, Siltavuorenpenger 20C, SF-00170 Helsinki 17, FINLAND. RI Vaz, Pedro/K-2464-2013; Ragazzi, Stefano/D-2463-2009; Marco, Jesus/B-8735-2008; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Carniel, Roberto/A-7044-2008; Silvestre, Enrique/I-4434-2012; Olshevskiy, Alexander/I-1580-2016; SANCHIS, ENRIQUE/J-7348-2016; Roditi, Itzhak/O-7448-2014; Ruiz, Alberto/E-4473-2011; Zaitsev, Alexandre/B-8989-2017 OI Vaz, Pedro/0000-0002-7186-2359; Ragazzi, Stefano/0000-0001-8219-2074; Marco, Jesus/0000-0001-7914-8494; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Carniel, Roberto/0000-0001-8391-2512; Silvestre, Enrique/0000-0002-4092-8597; Olshevskiy, Alexander/0000-0002-8902-1793; SANCHIS, ENRIQUE/0000-0002-9689-9131; Roditi, Itzhak/0000-0003-2363-5626; Ruiz, Alberto/0000-0002-3639-0368; Zaitsev, Alexandre/0000-0002-4961-8368 NR 51 TC 399 Z9 399 U1 4 U2 17 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 JUN 1 PY 1991 VL 303 IS 2 BP 233 EP 276 PG 44 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR965 UT WOS:A1991FR96500004 ER PT J AU SAILOR, WC ZIOCK, HJ KINNISON, WW HOLZSCHEITER, K AF SAILOR, WC ZIOCK, HJ KINNISON, WW HOLZSCHEITER, K TI A MODEL FOR THE PERFORMANCE OF SILICON MICROSTRIP DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PARTICLE AB The performance of silicon microstrip detectors which will be used at the SSC is simulated using charge carrier transport and electrostatic equations. The output current pulse shape as a function of detector dimensions, applied voltage, magnetic field strength, and particle trajectory is calculated. A Monte Carlo calculation, which combines the pulse shape results with an energy loss distribution, indicates that when operating at a 99% detection efficiency, charge sharing between neighboring strips will occur more than 40% of the time for 50-mu-m pitch double-sided readout detectors in the environment of a 2 T magnetic field. Using only hit/no-hit information, a position resolution of about 28-mu-m FWHM is achievable in the strip-to-strip dimension. If the p-side strips are rotated by 5 mrad with respect to the n-side strips, a hit position resolution in the lengthwise dimension of about 7 mm FWHM is calculated. RP SAILOR, WC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 12 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 JUN 1 PY 1991 VL 303 IS 2 BP 285 EP 297 DI 10.1016/0168-9002(91)90795-R PG 13 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR965 UT WOS:A1991FR96500006 ER PT J AU ARMIJO, V BLACK, K BOLTON, RD CARIUS, S COOPER, MD ESPINOZA, C HART, G HOGAN, GE LUDWIG, G MISCHKE, RE PIILONEN, L STANISLAUS, S SANDOVAL, J WHITEHOUSE, DA WILKINSON, C JUI, CCH AF ARMIJO, V BLACK, K BOLTON, RD CARIUS, S COOPER, MD ESPINOZA, C HART, G HOGAN, GE LUDWIG, G MISCHKE, RE PIILONEN, L STANISLAUS, S SANDOVAL, J WHITEHOUSE, DA WILKINSON, C JUI, CCH TI A FAST MWPC WITH CATHODE STRIPS AND UTILIZING CF4-ISOBUTANE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MULTIWIRE PROPORTIONAL CHAMBERS AB A planar wire chamber has been developed at LAMPF as a prototype for wire chambers of cylindrical configuration for electron detection in the MEGA experiment. Results from tests with the planar chamber have been used to set the geometrical parameters and predict the performance characteristics of the cylindrical chambers. The behavior of the planar chamber with CF4-isobutane gas demonstrates that 15-mu-m wire of 1 mm pitch is practical, that lifetimes greater than 0.045 C/cm are achievable and that gate widths of 25 ns are possible. C1 STANFORD UNIV,HANSEN LAB,STANFORD,CA 94305. RP ARMIJO, V (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1991 VL 303 IS 2 BP 298 EP 308 DI 10.1016/0168-9002(91)90796-S PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR965 UT WOS:A1991FR96500007 ER PT J AU HUBBARD, KM TESMER, JR NASTASI, M BOZOIAN, M AF HUBBARD, KM TESMER, JR NASTASI, M BOZOIAN, M TI MEASURED DEVIATIONS FROM RUTHERFORD BACKSCATTERING CROSS-SECTIONS USING LI-ION BEAMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID RBS AB Bozoian et al. have developed an analytical theory which predicts the incident ion energy at which elastic-scattering cross sections begin to deviate from their Rutherford values as the result of nuclear perturbations. The predictions are in good agreement with experimental data for proton and helium-ion beams, and should be applicable to heavier projectiles. The theory has also been extended to account for isotopic variation of the incident beam. As a further test of the theory, we have performed a series of backscattering measurements using both Li-6 and Li-7 ion beams. Lithium-ion backscattering is of importance to thin-film analysis because it offers improved depth sensitivity and kinematic mass resolution as compared to helium. Elastic-backscattering cross sections for O, F, Al, and Ti were measured relative to those of high-Z reference elements over an energy range of 2.5-9.25 MeV, and the energies at which they began to deviate from their Rutherford values were determined. The experimental results are compared to predictions from the analytical theory, and from optical-model calculations. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORY,LOS ALAMOS,NM 87545. RP HUBBARD, KM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 14 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 2 BP 121 EP 126 DI 10.1016/0168-583X(91)95576-Y PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FW562 UT WOS:A1991FW56200001 ER PT J AU BOZOIAN, M AF BOZOIAN, M TI DEVIATIONS FROM RUTHERFORD BACKSCATTERING FOR Z = 1, 2 PROJECTILES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID SCATTERING AB In a previous paper, an analytical expression for the center of mass kinetic energy, E(nr), for departure from Rutherford backscattering was obtained and applied to both proton and He-4 projectiles. This paper further explores the consequences of deviations from Rutherford backscattering, specifically for the charged particle projectiles, Z = 1, 2. In the original model there was no dependence on the nature of the projectile. In this paper, it is shown through the use of both data and optical model calculations that there are two clearly discernable projectile effects, namely an increase in E(nr) as the projectile charge increases and a less pronounced increase in E(nr) for the heaviest of the isotopes in each of the two charge groups. It is then demonstrated how these two effects can be accounted for in terms of the mass and change of the projectile, without changing either the model parameters or results of the previous paper. RP BOZOIAN, M (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORY,LOS ALAMOS,NM 87545, USA. NR 10 TC 28 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 2 BP 127 EP 131 DI 10.1016/0168-583X(91)95577-Z PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FW562 UT WOS:A1991FW56200002 ER PT J AU MARTZ, HE ROBERSON, GP SKEATE, MF SCHNEBERK, DJ AZEVEDO, SG AF MARTZ, HE ROBERSON, GP SKEATE, MF SCHNEBERK, DJ AZEVEDO, SG TI COMPUTERIZED-TOMOGRAPHY STUDIES OF CONCRETE SAMPLES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID INDUSTRIAL AB X-ray computerized tomography (CAT or CT) is a sophisticated imaging technique that provides cross-sectional views of materials, components and assemblies for industrial nondestructive evaluation (NDE). We have studied the feasibility of using CT as an inspection tool for reinforced concrete and the use of multi-energy, linear, attenuation techniques to deduce variations in density (rho) and/or atomic number (Z) that could be caused by varying the types of concrete mixes and/or compaction in the concrete itself. To perform this study, we designed and built a prototype medium-/high-energy (200- to 2000 keV) CT scanner - ZCAT - to image small concrete samples (less-than-or-equal-to 30 cm in diameter and less-than-or-equal-to 75 cm in height) with a spatial resolution of about 2 mm. We used ZCAT to quantitatively inspect a 20 cm concrete cube with 1.27 cm diameter reinforcing bars (rebars) and to measure rho and/or Z variations in a 20 cm diameter concrete cylinder. We describe the ZCAT scanner design, some of its physical limitations and the data-acquisition parameters used in our study. Our results and those of others [1,2] show that CT can be used to inspect reinforced concrete and to distinguish material rho and/or Z variations within concrete. RP MARTZ, HE (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,NONDESTRUCT EVALUAT SECT,POB 808,L-333,LIVERMORE,CA 94551, USA. NR 19 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 2 BP 216 EP 226 DI 10.1016/0168-583X(91)95591-Z PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FW562 UT WOS:A1991FW56200016 ER PT J AU BETZ, G PELLIN, MJ BURNETT, JW GRUEN, DM AF BETZ, G PELLIN, MJ BURNETT, JW GRUEN, DM TI LOW PRIMARY ION FLUENCE DEPENDENCE OF SINGLE-CRYSTAL SPUTTERING - A MOLECULAR-DYNAMICS STUDY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL WORKSHOP ON INELASTIC ION-SURFACE COLLISIONS CY SEP 17-21, 1990 CL WIENER NEUSTADT, AUSTRIA SP UNIV VIENNA, INST ALLEGEMEINE PHYS ID COMPUTER-SIMULATION AB In recent experiments, the fluence dependence of the sputtering yield for single crystals was investigated in the submonolayer range. Surprisingly, a 50% decrease of the yield was observed in the case of Ar ion bombardment of a ruthenium single crystal. We have investigated this behaviour by means of a molecular dynamics simulation for 100 to 500 eV Ne, Ar and Xe ion bombardment of a Cu(100) surface. The simulations indicate that changes in the surface structure on an atomic scale can be responsible for this observed decrease in the sputtering yield. Removal of a surface atom due to sputtering will leave a 'hole' at the surface. We have calculated how the sputtering yield changes in the neighbourhood of such a missing surface atom. For example, in the case of 500 eV Ar on Cu the yield drops from 3.3 to 2.3 for primary ion impact parameters within half of the lattice constant of the missing atom position and is only slightly above normal outside this area, reaching the value for the undamaged surface (3.3) within a lattice constant. The effect is even more pronounced for lower energies and higher ion masses (Xe). Thus the yield of a virgin surface will decrease with fluence until an equilibrium surface topography has developed. This effect could also explain why molecular dynamics calculations typically give sputtering yields higher than experimentally observed values. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BETZ, G (reprint author), VIENNA TECH UNIV,INST ALLGEMEINE PHYS,WIEDNER HAUPTSTR 8-10,A-1040 VIENNA,AUSTRIA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 17 TC 26 Z9 26 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 3-4 BP 429 EP 437 DI 10.1016/0168-583X(91)95881-D PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FY478 UT WOS:A1991FY47800024 ER PT J AU ORLANDO, TM BURNS, AR STECHEL, EB JENNISON, DR AF ORLANDO, TM BURNS, AR STECHEL, EB JENNISON, DR TI QUANTUM RESOLVED STUDIES OF ELECTRON-STIMULATED REACTIONS ON ADSORBATE COVERED PT(111) SURFACES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL WORKSHOP ON INELASTIC ION-SURFACE COLLISIONS CY SEP 17-21, 1990 CL WIENER NEUSTADT, AUSTRIA SP UNIV VIENNA, INST ALLEGEMEINE PHYS ID MOLECULAR-OXYGEN; NITROGEN-DIOXIDE; DESORPTION; NO; DISSOCIATION; PHOTOCHEMISTRY; SPECTROSCOPY; ADSORPTION; DYNAMICS; O-2 AB Using laser resonance-enhanced ionisation spectroscopy, we have studied electron (6-350 eV) stimulated dissociation of NO2 coadsorbed with up to 0.75 monolayer of atomic O on Pt(111). Several dramatic effects on NO2 dissociation occur due to the presence of O. There is a large (x 26) enhancement in the specific dissociation yield, a narrowing of the NO translational energy distributions, and a distinct propensity (> 4:1 at low J) for populating the upper OMEGA = 3/2 NO spin-orbit level over the OMEGA = 1/2 level. The spin-orbit state distribution of the O(3P(J)) dissociation fragment is (5.0):(2.5):(1.0) for J = 2, 1 and 0, which is within experimental error of the statistical (T --> infinity) 2J + 1 limit. The enhanced yield probably results from an increased excited state lifetime due to a reduction in substrate charge-transfer screening. We have also detected O(3P(J) = 2,1,0) and NO X2II3/2,1/2(nu = 5) above an electron (6-350 eV) beam irradiated Pt(111) surface containing coadsorbed O2 and NO at 90 K. We conclude that both O(3P(J)) and NO(nu = 5) are laser-induced photodissociation fragments of NO2 desorbates. The NO2 is probably the reaction product of a collision between an O atom (created by electron-stimulated dissociation of adsorbed O2) and an NO(a). We correlate the 10 eV NO2 production threshold with the dissociative ionization of the 3-sigma-g molecular bonding orbital of O2(a). RP ORLANDO, TM (reprint author), SANDIA NATL LABS,DIV 1151,ALBUQUERQUE,NM 87185, USA. RI Stechel, Ellen/B-1253-2012 NR 32 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 3-4 BP 477 EP 484 DI 10.1016/0168-583X(91)95888-K PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FY478 UT WOS:A1991FY47800031 ER PT J AU GRUEN, DM CALAWAY, WF PELLIN, MJ YOUNG, CE SPIEGEL, DR CLAYTON, RN DAVIS, AM BLUM, JD AF GRUEN, DM CALAWAY, WF PELLIN, MJ YOUNG, CE SPIEGEL, DR CLAYTON, RN DAVIS, AM BLUM, JD TI SELECTIVITY, SPECIFICITY AND SENSITIVITY IN THE PHOTOIONIZATION OF SPUTTERED SPECIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL WORKSHOP ON INELASTIC ION-SURFACE COLLISIONS CY SEP 17-21, 1990 CL WIENER NEUSTADT, AUSTRIA SP UNIV VIENNA, INST ALLEGEMEINE PHYS ID RESONANCE IONIZATION; MASS-SPECTROSCOPY; METEORITES; ATOMS; SYSTEMATICS; YIELD AB Resonance ionization of sputtered species has emerged as an exceedingly powerful technique for surface-compositional analysis and as a means to study a variety of fundamental aspects of the sputtering process. To deal with the problem of non- or near-resonant ionization, one needs to achieve the highest selectivity for photoionization of the species of interest relative to isobarically overlapping species by choosing a specific photoionization scheme tailored to that purpose. The present paper illustrates this point with several examples and helps point the way to still further improvements in detection sensitivity by minimizing non- or near-resonant ionization through detailed exploration of alternative photoionization schemes. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. DARTMOUTH COLL,DEPT EARTH SCI,HANOVER,NH 03755. RP GRUEN, DM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008; OI Pellin, Michael/0000-0002-8149-9768; Davis, Andrew/0000-0001-7955-6236 NR 19 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 3-4 BP 505 EP 511 DI 10.1016/0168-583X(91)95892-H PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FY478 UT WOS:A1991FY47800035 ER PT J AU DOSANJH, SS PILCH, M AF DOSANJH, SS PILCH, M TI LOWER HEAD CREEP-RUPTURE SENSITIVITY STUDIES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID POROUS-MEDIA; MELT PROPAGATION AB During hypothetical severe nuclear reactor accidents, structural materials in the reactor vessel can relocate downward and form debris regions above the lower head. A one-dimensional model is presented that considers melt progression in the debris as well as the thermal and mechanical response of the head. Only creep rupture of the lower head is considered; however, other modes of vessel failure can be considered with the methodology developed, and the model can easily be extended to higher dimensions. Numerical solutions are compared with an analytical model developed by T. G. Theofanous. The goal of the work is to identify the parameters that most affect the state of the debris at the time of lower head creep rupture. Results of sensitivity analyses presented indicated that melt relocation phenomena, the initial composition profile of the debris, and the pressure inside the vessel are all important. On the other hand, changing the porosity or the particle diameter produces less significant effects because several competing phenomena cancel each other. RP DOSANJH, SS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 35 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1991 VL 108 IS 2 BP 172 EP 183 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FP173 UT WOS:A1991FP17300004 ER PT J AU PETTI, DA MARTINSON, ZR HOBBINS, RR OSETEK, DJ AF PETTI, DA MARTINSON, ZR HOBBINS, RR OSETEK, DJ TI RESULTS FROM THE POWER BURST FACILITY SEVERE FUEL DAMAGE TEST 1-4 - A SIMULATED SEVERE FUEL DAMAGE ACCIDENT WITH IRRADIATED FUEL-RODS AND CONTROL RODS SO NUCLEAR TECHNOLOGY LA English DT Article ID BEHAVIOR AB Highly irradiated fuel rods and control rods are used in the Power Burst Facility Severe Fuel Damage (SFD) Test 1-4 to simulate conditions expected during a high-temperature, severe fuel damage accident in a pressurized water reactor. The objective of the test is to provide data on fuel and control rod behavior, hydrogen generation, and the release and transport of fission products and aerosols during severe accidents. Important results from the test based upon the response of on-line instrumentation, analysis of fission product and aerosol data, and postirradiation examination of the fuel bundle are presented. The results from SFD 1-4 provide insight into phenomena governing fuel bundle thermal response, Zircaloy oxidation and hydrogen generation, control rod degradation behavior, core melt progression, fission product release, aerosol generation, and fission product and aerosol deposition and transport. RP PETTI, DA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 24 TC 12 Z9 12 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 JUN PY 1991 VL 94 IS 3 BP 313 EP 335 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FM206 UT WOS:A1991FM20600004 ER PT J AU MIHALCZO, JT BLAKEMAN, ED RAGAN, GE KRYTER, RC SEINO, H ROBINSON, RC AF MIHALCZO, JT BLAKEMAN, ED RAGAN, GE KRYTER, RC SEINO, H ROBINSON, RC TI CF-252-SOURCE-DRIVEN NEUTRON NOISE MEASUREMENTS OF SUBCRITICALITY FOR AN ANNULAR TANK CONTAINING AQUEOUS PU-U NITRATE SO NUCLEAR TECHNOLOGY LA English DT Article ID URANIUM METAL; CF-252; REACTOR AB A series of subcritical experiments in unreflected annular geometry was performed with an aqueous Pu-U nitrate containing 173 and 262 g/l of plutonium and uranium, respectively. The plutonium contained 91.1 wt% Pu-239, while the depleted uranium contained 0.57 wt% U-235. In these experiments, the height of the solution in the annulus was varied from 17.8 to 84.2 cm. The annulus had an inner diameter of 25.4 cm, an outer diameter of 53.34 cm, and a 0.08-cm-thick wall of Type 304L stainless steel. Measurements using the Cf-252-source-driven neutron noise analysis method were interpreted to obtain the subcritical neutron multiplication factors. The data accumulated in the experiment, which is the first test of this method in annular geometry, are summarized, and the analysis of these data is presented. The results and conclusions of these experiments are as follows: (a) the capability to measure the subcriticality for a multiplying system of annular geometry to a k as low as 0.70 was demonstrated; (b) the criteria developed in previous experiments for choosing source-detector system configurations for which the data can be interpreted using a modified point kinetics were also satisfactory for this experiment; (c) the measurement times for this geometry were not significantly different from those used for cylindrical geometry and were sufficiently short to allow practical measurements; (d) the reactivities obtained from break frequency noise analysis measurements agreed with those obtained from the ratios of spectral densities within the experimental uncertainties; (e) the applicability of the method and an understanding of the theory of the measurement method for plutonium solution systems were demonstrated; and (f) the calculated neutron multiplication factors agreed with the experimental values of k to within approximately 0.03. C1 UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. OARAI ENGN CTR,OARAI,IBARAKI 31113,JAPAN. MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE,TN 37831. RP MIHALCZO, JT (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831, USA. NR 31 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1991 VL 94 IS 3 BP 336 EP 360 PG 25 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FM206 UT WOS:A1991FM20600005 ER PT J AU ADAMS, JP ATWOOD, CL AF ADAMS, JP ATWOOD, CL TI THE IODINE SPIKE RELEASE RATE DURING A STEAM-GENERATOR TUBE RUPTURE SO NUCLEAR TECHNOLOGY LA English DT Article ID REACTOR AB The U.S. Nuclear Regulatory Commission (NRC) requires utilities to determine the response of a pressureized water reactor (PWR) to a steam generator tube rupture (SGTR) as part of the safety analysis for the plant. The SGTR analysis includes assumptions regarding the presence of fission product iodine in the reactor coolant resulting from iodine spikes. To get a better understanding of iodine spiking, reactor trip and associated radiochemistry data were collected from 26 PWRs. These data were compared against validation criteria to determine their applicability to an investigation of the magnitude of an iodine spike following a reactor trip. The applicable data and the results of a statistical analysis are presented. Conclusions are made from this analysis of iodine spiking following reactor trips concerning the magnitude of a spike during an SGTR and compared with the NRC analysis criteria. The conclusion is then made that the iodine release rate expected during an SGTR, on the basis of the analysis of the data base, is much less (by a factor of 15 or more) than that specified by the NRC for analysis of this accident type. RP ADAMS, JP (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,NUCL ENGN GRP,POB 1625,IDAHO FALLS,ID 83415, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1991 VL 94 IS 3 BP 361 EP 371 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FM206 UT WOS:A1991FM20600006 ER PT J AU DOBRANICH, D ELGENK, MS AF DOBRANICH, D ELGENK, MS TI THERMAL-STRESS ANALYSES OF THE MULTILAYERED FUEL-PARTICLES OF A PARTICLE-BED REACTOR SO NUCLEAR TECHNOLOGY LA English DT Article AB Particle-bed reactors have been proposed to provide high-temperature, low-mass power sources for space-based operation. A computer program was prepared to simulate the thermal and mechanical response of a multilayered fuel particle operating in such a reactor. Issues of concern include temperature gradient and interference thermal stresses, along with the plastic and creep deformations associated with the high temperature of operation. The results of the computer simulations indicate that the interference thermal stress is much larger than the temperature gradient stress and the external pressure stress, and that permanent strain formation cannot be avoided for particles operating at temperatures greater than approximately 2300 K. The results also reveal some interesting aspects unique to multilayered fuel particle performance. Two such aspects include (a) the interaction between interference thermal stress and high-temperature creep and (b) the effect of power ramp time on the formation of time-dependent plastic strains. C1 UNIV NEW MEXICO,INST SPACE NUCL POWER STUDIES,ALBUQUERQUE,NM 87131. RP DOBRANICH, D (reprint author), SANDIA NATL LABS,DIV NUCL TECHNOL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1991 VL 94 IS 3 BP 372 EP 382 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FM206 UT WOS:A1991FM20600007 ER PT J AU EINZIGER, RE MARSCHMAN, SC BUCHANAN, HC AF EINZIGER, RE MARSCHMAN, SC BUCHANAN, HC TI SPENT-FUEL DRY-BATH OXIDATION TESTING SO NUCLEAR TECHNOLOGY LA English DT Article ID AIR; BEHAVIOR; RODS; UO2 AB Multiple samples of moderate-burnup pressurized water reactor (PWR) and boiling water reactor (BWR) spent fuel are oxidized in controlled atmosphere dry baths at 175, 130, and 110-degrees-C. The atmosphere consists of air humidified to a dew point of either -55 or +80-degrees-C. These tests are run for up to 18.8 kh. The weight gain data from these tests are anlayzed using a mathematical model incorporating the assumption that oxidation occurs by rapid grain-boundary oxygen diffusion, followed by oxidation of the individual fuel grains. The BWR fuel appears to oxidize slightly faster than PWR fuel, and the data suggest a possible increase in oxidation rate in moist air. Reasonable agreement is observed between the oxidation rate constants obtained in these long-term tests and prior short-term thermogravimetric analysis oxidation tests. C1 PACIFIC NW LAB, TRITIUM TARGET PERFORMANCE GRP, RICHLAND, WA 99352 USA. RP EINZIGER, RE (reprint author), PACIFIC NW LAB, MAT & CHEM SYST PERFORMANCE SECT, POB 999, RICHLAND, WA 99352 USA. RI Marschman, Steven/E-5193-2017 OI Marschman, Steven/0000-0002-3335-4695 NR 24 TC 9 Z9 9 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 JUN PY 1991 VL 94 IS 3 BP 383 EP 393 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FM206 UT WOS:A1991FM20600008 ER PT J AU ROBERTS, JP HARPER, SE GOSNELL, TR TAYLOR, AJ AF ROBERTS, JP HARPER, SE GOSNELL, TR TAYLOR, AJ TI GENERATION OF 50-MU-J SUBPICOSECOND PULSES AT 248 NM SO OPTICS COMMUNICATIONS LA English DT Article ID KRF-STAR LASER; SYSTEM; AMPLIFICATION; SPECTROSCOPY AB An efficient 248-nm source used for the seeding of KrF amplifiers is described. The frequency-doubled output of a mode-locked dye oscillator-amplifier system is heterodyned with a 1064-nm pulse to produce a 50-mu-J subpicosecond pulse in the ultraviolet. RP ROBERTS, JP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LASER & OPT SCI GRP,LOS ALAMOS,NM 87545, USA. NR 18 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD JUN 1 PY 1991 VL 83 IS 3-4 BP 231 EP 234 DI 10.1016/0030-4018(91)90168-D PG 4 WC Optics SC Optics GA FR959 UT WOS:A1991FR95900006 ER PT J AU RATOWSKY, RP FLECK, JA AF RATOWSKY, RP FLECK, JA TI ACCURATE NUMERICAL-SOLUTION OF THE HELMHOLTZ-EQUATION BY ITERATIVE LANCZOS REDUCTION SO OPTICS LETTERS LA English DT Article ID PROPAGATION; BEAMS AB The Lanczos recursion algorithm is used to determine forward-propagating solutions for both the paraxial and Helmholtz wave equations for longitudinally invariant refractive indices. By eigenvalue analysis it is demonstrated that the method gives extremely accurate solutions to both equations. RP RATOWSKY, RP (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 8 TC 29 Z9 29 U1 2 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUN 1 PY 1991 VL 16 IS 11 BP 787 EP 789 DI 10.1364/OL.16.000787 PG 3 WC Optics SC Optics GA FP178 UT WOS:A1991FP17800003 PM 19776785 ER PT J AU SCHEFER, RW NAMAZIAN, M KELLY, J AF SCHEFER, RW NAMAZIAN, M KELLY, J TI SIMULTANEOUS RAMAN-SCATTERING AND LASER-INDUCED FLUORESCENCE FOR MULTISPECIES IMAGING IN TURBULENT FLAMES SO OPTICS LETTERS LA English DT Article ID DIFFUSION FLAME AB A multispecies imaging technique for single-shot, simultaneous measurement of the OH, CH, and CH, concentrations in turbulent nonpremixed flames is described. A unique aspect of the system is the use of a two-wavelength multipass cell to form both a visible and a UV laser sheet. The UV beam is used to excite fluorescence in the OH molecule, while Raman scattering from CH4 molecules and fluorescence induced in CH is achieved by using the visible beam. The visible and UV lasers are operated simultaneously, and the resulting signals are recorded by two vidicon cameras. The sheet intensity provided by the multipass cell is sufficient to saturate the OH transition, which makes single-shot, laser-saturated fluorescence imaging measurements possible. RP SCHEFER, RW (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,ALBUQUERQUE,NM 87185, USA. RI Schefer, Jurg/G-3960-2012 NR 9 TC 9 Z9 9 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUN 1 PY 1991 VL 16 IS 11 BP 858 EP 860 DI 10.1364/OL.16.000858 PG 3 WC Optics SC Optics GA FP178 UT WOS:A1991FP17800027 PM 19776809 ER PT J AU HARTWIG, JF ANDERSEN, RA BERGMAN, RG AF HARTWIG, JF ANDERSEN, RA BERGMAN, RG TI ALKYL, ARYL, HYDRIDO, AND ACETATE COMPLEXES OF (DMPM)2RU [DMPM = BIS(DIMETHYLPHOSPHINO)METHANE] - REDUCTIVE ELIMINATION AND OXIDATIVE ADDITION OF C-H BONDS SO ORGANOMETALLICS LA English DT Article ID CARBON-HYDROGEN-BONDS; RAY CRYSTAL-STRUCTURES; THERMAL-DECOMPOSITION; IRIDIUM COMPLEXES; TETRAKIS(TRIMETHYLPHOSPHINE)OSMIUM(II) SYSTEM; PHOTOCHEMICAL CARBONYLATION; ORGANOMETALLIC CHEMISTRY; SATURATED-HYDROCARBONS; ALKANE DEHYDROGENATION; METAL-COMPLEXES AB Complexes of the general formula (DMPM)(n)Ru(X)(Y) [DMPM = 1,2-bis(dimethylphosphino)methane] were investigated. Addition of excess DMPM to the ruthenium triphenylphosphine compound (PPh3)2Ru(OAc)2 (1) led to formation of the mononuclear tris (DMPM) complex with the formula (eta-1-DMPM)2(eta-2-DMPM)Ru(OAc)2 (2). Addition of 2 equiv of DMPM to 1 gave the dimeric complex (eta-1-DMPM)2(eta-2-DMPM)2Ru2(OAc)4 (3), and thermolysis of 3 led to formation of the monomeric product cis-(eta-2-DMPM)2Ru(OAc)2 (4). Monomeric compound 4 was used as a precursor to the dihydride cis-(eta-2-DMPM)2Ru(H)2 (5) by addition of lithium aluminum hydride, and as a precursor to diaryl and dialkyl complexes cis-(eta-2-DMPM)2Ru(R)2 by addition of aluminum and magnesium alkyl and aryl reagents. Irradiation of the dihydride 5 in benzene solvent led to extrusion of hydrogen and formation of the phenyl hydride complex cis-(eta-2-DMPM)2Ru(Ph)(H) (10). Addition of methanesulfonic acid to 5 formed the hydrido methanesulfonate trans-(eta-2-DMPM)2Ru(H)(OSO2Me) (8), which formed trans-(eta-2-DMPM)2Ru(H)(Me) (11) upon addition of trimethylaluminum at -78-degrees-C. This alkyl hydride was unstable at room temperature, eliminating methane to form phenyl hydride complex 10 in arene solvents. Phenyl hydride 10 undergoes exchange reactions at room temperature with toluene-d8 solvent to form a series of tolyl hydride products. These C-H oxidative additions proceed through the (DMPM)2Ru intermediate, also formed photolytically from dihydride 5, as determined by isotopic labeling studies. C1 UNIV CALIF BERKELEY,DEPT CHEM,1 CYCLOTRON RD,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. NR 72 TC 28 Z9 28 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUN PY 1991 VL 10 IS 6 BP 1710 EP 1719 DI 10.1021/om00052a016 PG 10 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FQ933 UT WOS:A1991FQ93300016 ER PT J AU BOUSSIE, TR EISENBERG, DC RIGSBEE, J STREITWIESER, A ZALKIN, A AF BOUSSIE, TR EISENBERG, DC RIGSBEE, J STREITWIESER, A ZALKIN, A TI STRUCTURES OF ORGANO-F-ELEMENT COMPOUNDS DIFFERING IN THE OXIDATION-STATE OF THE CENTRAL METAL - CRYSTAL-STRUCTURES OF BIS([8]ANNULENE) COMPLEXES OF CERIUM(IV), YTTERBIUM(III), AND URANIUM(III) SO ORGANOMETALLICS LA English DT Article ID MOLECULAR-ORBITAL CALCULATIONS; ALPHA SCATTERED-WAVE; CYCLOOCTATETRAENE DIANION; ORGANOMETALLIC COMPOUNDS; PHOTOELECTRON-SPECTRA; ELECTRONIC-STRUCTURE; URANOCENE; DERIVATIVES; THOROCENE; CHEMISTRY AB Crystal structures of bis(methyl[8]annulene)cerium(IV) (5), [(diethylene glycol dimethyl ether)potassium] [bis([8]annulene)ytterbate(III)] (14), and [(diethylene glycol dimethyl ether)potassium] [bis(methyl[8]-annulene)uranate(III)] (12) are reported. These include the first structures of an organocerium(IV) compound and of a reduced uranocene. Crystals of 5 are orthorhombic, P2(1)2(1)2(1), with a = 11.690 (3) angstrom, b = 14.315 (3) angstrom, c = 8.977 (2) angstrom, Z = 4, and R(F) = 2.9%. Crystals of 14 are also orthorhombic, Pbca, with a = 16.611 (4) angstrom, b = 14.219 (5), angstrom, c = 9.257 (4) angstrom, Z = 4, and R(F) = 3.6%. Crystals of 12 are monoclinic, P2(1)/c, with a = 13.833 (4) angstrom, b = 9.989 (3) angstrom, c = 17.581 (3) angstrom, beta = 95.87 (3)degrees, Z = 4, and R(F) = 3.8%. These structures are compared to the previously reported structures of [(diethylene glycol dimethyl ether)potassium] [bis([8]annulene)cerate(III)] (13), bis[(dimethoxyethane)potassium] [bis([8]annulene)ytterbate(II)] (15), and uranocene (1). A comparison of the structural parameters of several additional [8]annulene metal complexes is also presented. The effect of coordination number on metal ligand distances in ionic complexes is discussed in terms of electrostatic interactions among the ligands. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 53 TC 57 Z9 57 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUN PY 1991 VL 10 IS 6 BP 1922 EP 1928 DI 10.1021/om00052a044 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FQ933 UT WOS:A1991FQ93300044 ER PT J AU FISH, RH BARALT, E KIM, HS AF FISH, RH BARALT, E KIM, HS TI BONDING OF MONONUCLEAR AND POLYNUCLEAR HETEROAROMATIC NITROGEN LIGANDS TO THE (ETA-5-PENTAMETHYLCYCLOPENTADIENYL)RHODIUM DICATION - STRUCTURE REACTIVITY RELATIONSHIPS IN THE FORMATION OF NITROGEN (ETA-1) VERSUS PI(ETA-5,ETA-6) COMPLEXES AND COMPETITION STUDIES OF THE LIGANDS FOR THE RHODIUM METAL CENTER SO ORGANOMETALLICS LA English DT Article ID HOMOGENEOUS CATALYTIC-HYDROGENATION; CARBONYL HYDRIDES; DERIVATIVES; REDUCTIONS; PYRIDINE AB The reactions of 4-methylpyridine (1), 3-methylpyridine (2), 2-methylpyridine (3), 3,5-dimethylpyridine (4), 2,4-dimethylpyridine (5), 2,4,6-trimethylpyridine (6), N-methylpyrrole (7), quinoline (8), isoquinoline (9), 2-methylquinoline (10), 1,2,3,4-tetrahydroquinoline (11), N-methylindole (12), acridine (13), phenanthridine (14), 5,6-benzoquinoline (15), and 7,8-benzoquinoline (16) with (eta-5-pentamethylcyclopentadienyl)rhodium dicationic complexes [Cp*Rh(CH3CN)3](X2) or [Cp*Rh((CH3)2CO)3](X2) (X = PF6 or BF4) were studied to ascertain how structure influenced the reactivity of ligands, 1-16, to provide nitrogen (N) versus pi-bonded Cp*Rh2+ complexes. Ligands 1-5, 8, 9, and 13-16 were found to form N(eta-1)-bonded rhodium complexes, while ligands 6, 7, 11, and 12 preferred pi(eta-5,eta-6)-coordination. Ligand 10 formed the N(eta-1)-bonded complex with [Cp*Rh(CH3CN)3]2+ and a approximately 1:1 mixture of N(eta-1)- and pi(eta-6)-bonded complexes with the (CH3)2CO derivative. [Cp*Rh(eta-1(N)-2-methylquinoline)((CH3)2CO)2]2+ was the only complex isolated that was found to undergo a N(eta-1)-pi(eta-6) rearrangement under vacuum, while its CH3CN analogue was unreactive. The order of competitive reactivity with ligands 3, 6, 8-11, and 14-16 for the rhodium metal center was found to be 9 (N) > 11 (pi) > 8 (N) > 3 (N) > 10 (N) > 14 (N) > 15(N) approximately 16 (N) > 6(pi) approximately 7(pi). The steric and electronic factors that favor N or pi-bonding to Cp*Rh2+ and similar factors that provide the competitive bonding order will be discussed. RP FISH, RH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 16 TC 40 Z9 40 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUN PY 1991 VL 10 IS 6 BP 1965 EP 1971 DI 10.1021/om00052a050 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FQ933 UT WOS:A1991FQ93300050 ER PT J AU RUSSELL, WL AF RUSSELL, WL TI WRIGHT,SEWALL - A VIEW FROM A STUDENT SO PERSPECTIVES IN BIOLOGY AND MEDICINE LA English DT Article RP RUSSELL, WL (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. NR 8 TC 0 Z9 0 U1 1 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0031-5982 J9 PERSPECT BIOL MED JI Perspect. Biol. Med. PD SUM PY 1991 VL 34 IS 4 BP 505 EP 515 PG 11 WC History & Philosophy Of Science; Medicine, Research & Experimental SC History & Philosophy of Science; Research & Experimental Medicine GA GB440 UT WOS:A1991GB44000004 ER PT J AU WOLF, D AF WOLF, D TI A MODEL FOR IDEAL CLEAVAGE FRACTURE OF GRAIN-BOUNDARIES IN BCC METALS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID TRANSITION-METALS; SYMMETRICAL TILT; FCC METALS; 100 PLANES; ENERGY; SIMULATION; TWIST AB The random grain boundary model is used to determine the work of adhesion of symmetrical high-angle twist grain boundaries (GBs) in b.c.c. metals. In this idealized theoretical model of a high-angle GB, the interactions of atoms across the interface are assumed to be entirely random. Because fully relaxed free surfaces are included naturally, the model is well suited for the determination of GB cleavage-fracture energies. From an investigation of the role of the GB plane, in particular of the interplanar spacing parallel to the GB, it is concluded that, as in the case of free surfaces, 'special' and 'vicinal' interfaces have fundamentally different physical properties. RP WOLF, D (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 24 TC 6 Z9 6 U1 1 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 JUN PY 1991 VL 63 IS 6 BP 1117 EP 1136 PG 20 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA FV815 UT WOS:A1991FV81500001 ER PT J AU GYORFFY, BL BARBIERI, A STAUNTON, JB SHELTON, WA STOCKS, GM AF GYORFFY, BL BARBIERI, A STAUNTON, JB SHELTON, WA STOCKS, GM TI CHARGE AND SPIN FLUCTUATIONS IN THE DENSITY FUNCTIONAL THEORY SO PHYSICA B LA English DT Article; Proceedings Paper CT 65TH HERAEUS SEMINAR ON ELECTRONIC STRUCTURE IN THE 1990S, ON THE OCCASION OF THE 60TH BIRTHDAY OF A J FREEMAN CY JUL 23-25, 1990 CL BAD HONNEF, FED REP GER SP W E HERAEUS FDN ID TRANSITION; MAGNETISM; IRON; ALLOYS; METALS AB We introduce a conceptual framework which allows us to treat charge and spin fluctuations about the local density approximation (LDA) in to the density functional theory (DFT). We illustrate the approach by explicit study of the disordered local moment (DLM) state in Fe above the Curie temperature T(c) and the Mott insulating state in MnO. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. RP GYORFFY, BL (reprint author), UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 27 TC 6 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 35 EP 43 DI 10.1016/0921-4526(91)90414-A PG 9 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100008 ER PT J AU JOHANSSON, B ERIKSSON, O NORDSTROM, L SEVERIN, L BROOKS, MSS AF JOHANSSON, B ERIKSSON, O NORDSTROM, L SEVERIN, L BROOKS, MSS TI ORBITAL MAGNETISM IN ENERGY-BANDS SO PHYSICA B LA English DT Article; Proceedings Paper CT 65TH HERAEUS SEMINAR ON ELECTRONIC STRUCTURE IN THE 1990S, ON THE OCCASION OF THE 60TH BIRTHDAY OF A J FREEMAN CY JUL 23-25, 1990 CL BAD HONNEF, FED REP GER SP W E HERAEUS FDN ID INTERMETALLIC COMPOUNDS; NEUTRON-DIFFRACTION; COMPTON-SCATTERING; HIGH-PRESSURE; CERIUM; PHASE; TRANSITION; CO; SUSCEPTIBILITY; PRASEODYMIUM AB Recent work on orbital magnetism in itinerant magnets is reviewed. It is shown that such an orbital contribution to the magnetic moment is especially important for magnets involving actinide systems and that it is of a size comparable to the spin contribution. In particular, the results for the AnFe2 (An = U, Np and Pu) compounds are discussed and their anomalous properties, as compared to corresponding standard rare-earth systems, are explained in terms of 3d-5f hybridization and orbital polarization within the 5f band manifold. As an introduction to the AnFe2 systems we discuss CeFe2 for which we predict 4f band magnetism in addition to the normal iron magnetism. It is most significant that, in agreement with experiment, the size of the iron moment is found to be reduced in comparison to its value in rare-earth magnets like YFe2. The alpha-gamma transition in Ce metal is also treated and the calculated volume collapse agrees with experiment. Related calculations for Pr and Nd are also briefly discussed. Finally, the orbital contribution to the magnetism in Fe, Co and Ni is considered, and its maximum for Co is explained as the result of the HCP crystal structure. C1 COMMISS COMMUNITIES,EUROPEAN INST TRANSURANIUM ELEMENTS,JOINT RES CTR,W-7500 KARLSRUHE,GERMANY. UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP JOHANSSON, B (reprint author), UNIV UPPSALA,INST PHYS,CONDENSED MATTER THEORY GRP,BOX 530,S-75121 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 53 TC 20 Z9 20 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 101 EP 116 DI 10.1016/0921-4526(91)90422-B PG 16 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100016 ER PT J AU KOELLING, DD AF KOELLING, DD TI F-ELECTRON SYSTEMS - PUSHING BAND THEORY SO PHYSICA B LA English DT Article; Proceedings Paper CT 65TH HERAEUS SEMINAR ON ELECTRONIC STRUCTURE IN THE 1990S, ON THE OCCASION OF THE 60TH BIRTHDAY OF A J FREEMAN CY JUL 23-25, 1990 CL BAD HONNEF, FED REP GER SP W E HERAEUS FDN ID PHOTOEMISSION SPECTRA; FERMI-SURFACE; 2-PEAK PHOTOEMISSION; UPT3; CESN3; SUPERCONDUCTIVITY; MAGNETISM; DENSITY AB The f-electron orbitals have always been the "incomplete atomic shells acting as local moments, and weakly interacting with the remaining electronic structure" in the minds of most people. So examining them using a band theory where one views them as itinerant was once - and to some extent even today still is - considered with some skepticism. Nonetheless, a very significant community has successfully utilized band theory as a probe of the electronic structure of the appropriate actinides and rare earths. Those people actually using the approach would be the first to declare that it is not the whole solution. Instead, one is pushing and even exceeding its limits of applicability. However, the appropriate procedure is to push the model consistently to its limits, patch where possible, and then look to see where discrepancies remain. I propose to offer a selected review of past developments (emphasizing the career to date of A.J. Freeman in this area), offer a list of interesting puzzles for the future, and then make some guesses as to the techniques one might want to use. RP KOELLING, DD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 31 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 117 EP 123 DI 10.1016/0921-4526(91)90423-C PG 7 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100017 ER PT J AU KONIG, U GINATEMPO, B HORMANDINGER, G WEINBERGER, P BORING, AM AF KONIG, U GINATEMPO, B HORMANDINGER, G WEINBERGER, P BORING, AM TI A FULLY RELATIVISTIC STUDY OF ANGLE-RESOLVED PHOTOEMISSION FROM AG (100) AND AU (100) SURFACES SO PHYSICA B LA English DT Article; Proceedings Paper CT 65TH HERAEUS SEMINAR ON ELECTRONIC STRUCTURE IN THE 1990S, ON THE OCCASION OF THE 60TH BIRTHDAY OF A J FREEMAN CY JUL 23-25, 1990 CL BAD HONNEF, FED REP GER SP W E HERAEUS FDN ID DIPOLE SELECTION-RULES; ELECTRONIC-STRUCTURE; SPIN; NECESSITY; CRYSTALS; SOLIDS AB Results of a fully relativistic study of angle-resolved photoemission (ARPES) for the (100) surfaces of Ag and Au are presented. The calculations are based on FLAPW thin film potentials and a single-step model of photoemission. The results for Ag are compared with experimental data and a previous non-relativistic calculation. In the case of Au-DELTA-6 and DELTA-7 initial state symmetries are investigated using linearly and circularly polarized light. C1 UNIV MESSINA,FAC SCI,IST FIS TEORET,I-98166 MESSINA,ITALY. UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP KONIG, U (reprint author), VIENNA TECH UNIV,INST TECH ELEKTROCHEM,A-1060 VIENNA,AUSTRIA. NR 26 TC 0 Z9 0 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 125 EP 133 DI 10.1016/0921-4526(91)90424-D PG 9 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100018 ER PT J AU MUELLER, FM FOWLER, CM FREEMAN, BL HULTS, WL KING, JC SMITH, JL AF MUELLER, FM FOWLER, CM FREEMAN, BL HULTS, WL KING, JC SMITH, JL TI MEASUREMENT OF THE DEHAASVANALPHEN EFFECT IN YBA2CU3O6.97 USING MEGAGAUSS FIELDS SO PHYSICA B LA English DT Article; Proceedings Paper CT 65TH HERAEUS SEMINAR ON ELECTRONIC STRUCTURE IN THE 1990S, ON THE OCCASION OF THE 60TH BIRTHDAY OF A J FREEMAN CY JUL 23-25, 1990 CL BAD HONNEF, FED REP GER SP W E HERAEUS FDN ID YBA2CU3O7-DELTA AB The oscillatory component of the magnetic susceptibility (de Haas-van Alphen effect) has been investigated using a dynamically driven, pulsed 105 T flux compression system. Data are presented for oriented 10-mu-m diameter Y123 single crystalline powders for fields along the (001) or c axis. It is concluded from these data that Y123 exhibits a Fermi surface in its normal phase at low temperatures. RP MUELLER, FM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 26 Z9 26 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 253 EP 260 DI 10.1016/0921-4526(91)90438-K PG 8 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100032 ER PT J AU WATSON, RE WEINERT, M FERNANDO, GW DAVENPORT, JW AF WATSON, RE WEINERT, M FERNANDO, GW DAVENPORT, JW TI CHARGE-TRANSFER, CHARGE TAILING, COHESION AND ELECTRON PROMOTION IN THE TRANSITION-METALS SO PHYSICA B LA English DT Article; Proceedings Paper CT 65TH HERAEUS SEMINAR ON ELECTRONIC STRUCTURE IN THE 1990S, ON THE OCCASION OF THE 60TH BIRTHDAY OF A J FREEMAN CY JUL 23-25, 1990 CL BAD HONNEF, FED REP GER SP W E HERAEUS FDN AB Two issues will be considered in this paper. The first recalls Art Freeman's early interest in charge and magnetic hyperfine effects and is concerned with the factors involved in the "charge transfer in solid compounds", either as measured in experiment or as calculated by band theory. The second matter, which will be inspected briefly, follows up on ideas of Gunnarsson and Jones concerning errors in the LDA theory description of s-d promotion energies in transition-metal atoms and their implications for calculating cohesive energies. In dealing with charge transfer, band theorists very often integrate the charge over an atomic sphere or cell and then talk of it as if the terms are LCAO occupation numbers. Quantitatively the two occupancies can be very different because of the spatial extent (overlap) of the orbitals. Using augmented-basis calculations, we shall go beyond the simple LCAO description and further decompose the charge into on-site and "tailing" contributions, which we believe give a more transparent physical picture. It will be seen that discussions about the charge occupancy and charge transfer as arising from band hybridization, band filling, and screening are incomplete if they neglect the quantitative implications of charge tailing. For example, the p-like term in the charge density of a transition-metal site is primarily tail-like, that is not intrinsic to the site. Thus "p bonding" is not substantial, however, the changes in the small amount of on-site p charge on going from an elemental metal to a compound, or from one compound to another compound, may be of significance. RP WATSON, RE (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 289 EP 298 DI 10.1016/0921-4526(91)90443-I PG 10 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100037 ER PT J AU ELSASSER, C FAHNLE, M HO, KM CHAN, CT AF ELSASSER, C FAHNLE, M HO, KM CHAN, CT TI ABINITIO PSEUDOPOTENTIAL CALCULATIONS OF TOTAL ENERGIES AND FORCES FOR HYDROGEN IN PALLADIUM SO PHYSICA B-CONDENSED MATTER LA English DT Article ID DENSITY FUNCTIONAL FORMALISM; ELECTRONIC-STRUCTURE; TRANSITION-METALS; SOLIDS; SUPERCONDUCTIVITY; DYNAMICS; PDH AB Ground-state properties of palladium-hydrogen systems are investigated in the framework of density functional theory in the local-density approximation. Norm-conserving ab initio pseudopotentials are used to describe the interactions between electrons and ion cores. The crystalline wave functions and the charge densities of the valence electrons are represented by a mixed basis containing plane waves and additionally localized d-like functions for palladium and s-like functions for hydrogen. Total energies are calculated for Pd-H systems with different hydrogen concentrations using Pd(n)H supercells (n = 1,4, 8, 16, 32). We report on the cohesive properties as well as the diffusion potentials and vibrational energies for the interstitial hydrogen. Lattice relaxations are taken into account by calculating atomic forces according to the Hellmann-Feynman theorem and statically relaxing the atomic positions. C1 US DOE, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. RP MAX PLANCK INST MET RES, INST PHYS, HEISENBERGSTR 1, W-7000 STUTTGART 80, GERMANY. NR 37 TC 18 Z9 18 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 217 EP 224 DI 10.1016/0921-4526(91)90434-G PG 8 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100028 ER PT J AU SHU, JF AKELLA, J LIU, JZ MAO, HK FINGER, LW AF SHU, JF AKELLA, J LIU, JZ MAO, HK FINGER, LW TI HIGH-PRESSURE DAC STUDIES ON UNDOPED LA2CUO4 SO PHYSICA C LA English DT Article ID SUPERCONDUCTIVITY AB Undoped La2CuO4 oxide ceramic single crystal and polycrystalline materials were studied up to 25.0 GPa in a diamond-anvil cell (DAC) apparatus. La2CuO4 undergoes a phase transformation from an orthorhombic to a tetragonal structure at about 3.4 GPa, and this result is different from the data previously published by others. Compression of this material is only 9% at 25.0 GPa. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP SHU, JF (reprint author), CARNEGIE INST WASHINGTON,GEOPHYS LAB,525 BROAD BRANCH RD,WASHINGTON,DC 20015, USA. NR 8 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 JUN 1 PY 1991 VL 176 IS 4-6 BP 503 EP 506 DI 10.1016/0921-4534(91)90055-4 PG 4 WC Physics, Applied SC Physics GA FU216 UT WOS:A1991FU21600022 ER PT J AU NILSEN, J AF NILSEN, J TI RESONANTLY PHOTOPUMPED NI-LIKE TL X-RAY LASER SO PHYSICA SCRIPTA LA English DT Article ID POPULATION-INVERSION; CROSS-SECTIONS; AMPLIFICATION; PLASMAS; IONS; LINE; PHOTOEXCITATION; PHOTOIONIZATION; TITANIUM; SPECTRA AB This paper proposes a new X-ray laser which lases on several 4d --> 4p transitions in nickel-like thallium (Z = 81) and which is resonantly photo-pumped by the ly-alpha emission lines from hydrogen-like potassium (Z = 19). The resonant photo-pumping process consists of the Ly-alpha emission lines pumping an electron in the ground state of Ni-like Tl to the 3dBAR3/2 5f5/2 (J = 1) state, which then decays directly to the 3dBAR3/2 4d3/2 (J = 0, 1) upper laser states. This scheme has the tremendous advantage of strongly enhancing the gain of the shortest wavelength 4d --> 4p transition at 33.1 angstrom whose analogue line has already been observed to lase in collisionally pumped Ni-like lasers involving nearby ions; therefore it should be much easier to observe the photo-pumping process as it will increase an already finite exponential gain. Calculations of the gain of these laser transitions in steady-state equilibrium plasmas are presented. RP NILSEN, J (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 40 TC 6 Z9 6 U1 0 U2 1 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD JUN PY 1991 VL 43 IS 6 BP 596 EP 598 DI 10.1088/0031-8949/43/6/010 PG 3 WC Physics, Multidisciplinary SC Physics GA FU693 UT WOS:A1991FU69300010 ER PT J AU CHEN, MH CRASEMANN, B AF CHEN, MH CRASEMANN, B TI RESONANCE ENHANCEMENT OF ELECTRON-IMPACT EXCITATION RATES FOR ARGONLIKE IONS SO PHYSICAL REVIEW A LA English DT Article ID AUTO-IONIZING RESONANCES; BE-LIKE IONS; NE-LIKE IONS; SCATTERING; SELENIUM AB We have calculated the electron-impact excitation-rate coefficients for the 3p-3d transitions of Ar-like ions with Z = 42, 54, and 63. The direct-excitation rates were evaluated with relativistic multiconfiguration target wave functions in a distorted-wave approximation. The contributions from the autoionizing resonances were calculated by the multiconfiguration Dirac-Fock method. For most transitions, autoionizing resonances are found to enhance the rate coefficients by factors of 2-3 for electron temperatures below the temperature at which peak excitation occurs. The enhancement is much less at higher temperatures. C1 UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. UNIV OREGON,INST CHEM PHYS,EUGENE,OR 97403. RP CHEN, MH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 5886 EP 5890 DI 10.1103/PhysRevA.43.5886 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600017 ER PT J AU MIRAGLIA, JE MACEK, J AF MIRAGLIA, JE MACEK, J TI QUANTUM-MECHANICAL IMPULSE APPROXIMATION FOR SINGLE IONIZATION OF HYDROGENLIKE ATOMS BY MULTICHARGED IONS SO PHYSICAL REVIEW A LA English DT Article ID INTERMEDIATE ENERGIES; ELECTRON-CAPTURE; ANGULAR-DISTRIBUTION; CHARGE DEPENDENCE; CROSS-SECTIONS; FAST PROTONS; COLLISIONS; EXCITATION; HELIUM; IMPACT AB A quantum-mechanical approximation is developed for ionization of one-electron targets by charged-ion impact. The model is based on the nonrelativistic distorted-wave formalism valid for impact velocities larger than the electron orbital velocity in the initial state. The exact impulse wave function is used to describe the initial state, thus incorporating the projectile potential to all orders. The final state is represented by a product of continuum Coulomb wave functions around both centers, providing the correct asymptotic conditions and the projectile and target cusps. The theory is thought to be valid for large projectile charge, even larger than the ion velocity. The impulse approximation developed here is expensive in computing time, but it is probably one of the few models to deal with high projectile charges. Double-differential cross sections are computable in the forward and backward ejection angles. Comparisons with the experiments in different regions of interest are presented, including the binary sphere, capture to the continuum cusp, ridge electrons, and backward ejection angles. The theory proves to be quite successful, and it does not seem to deteriorate with increasing projectile charge. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MIRAGLIA, JE (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 40 TC 53 Z9 53 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 5919 EP 5928 DI 10.1103/PhysRevA.43.5919 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600020 ER PT J AU NAGY, O MACEK, JH MIRAGLIA, JE AF NAGY, O MACEK, JH MIRAGLIA, JE TI IMPULSE APPROXIMATION IN PROTON-HYDROGEN COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; ELECTRON-CAPTURE; BARE ION; AMPLITUDE AB Analytic expressions for 1s-nlm differential-capture cross sections in proton-hydrogen collisions are derived. We employ the partially peaked impulse approximation and retain terms up to first order in an expansion of the Fourier transform of the potential. The exact impulse approximation is also computed using numerical integration of a three-dimensional integral. The exact and analytic calculations are compared with each other and with experiment. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP NAGY, O (reprint author), FAC EDUC KAFR,DEPT PHYS & CHEM,RAFR EL SHEIH,EGYPT. NR 24 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 5991 EP 5996 DI 10.1103/PhysRevA.43.5991 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600029 ER PT J AU VANDERMEULEN, P KRAUSE, MO DELANGE, CA AF VANDERMEULEN, P KRAUSE, MO DELANGE, CA TI ANGLE-RESOLVED PHOTOELECTRON-SPECTROSCOPY OF ATOMIC OXYGEN SO PHYSICAL REVIEW A LA English DT Article ID PHOTOIONIZATION CROSS-SECTIONS; ANGULAR-DISTRIBUTION; PHOTO-IONIZATION; BRANCHING RATIOS; ASYMMETRY PARAMETERS; HIGH-RESOLUTION; AUTOIONIZATION; STATES; PHOTOIONISATION; THRESHOLD AB Using synchrotron-radiation-based angle-resolved photoelectron spectroscopy, the relative partial photoionization cross sections for the production of the 4S(o) and 2D(o) ionic states in atomic oxygen, as well as the corresponding asymmetry parameters, are measured from threshold at 13.62 to about 30 eV. The cross sections are placed on an absolute scale using previous data obtained with an electron spectroscopy modulation method. Attention is focused on the numerous autoionization resonances below the 2p-12D(o), 2p-12P(o), and 2s-14P(e) limits. The behavior of the asymmetry parameters across these resonances is observed for the first time. The 2s2p4(4P(e))3p(3S(o),3P(o)3D(o)) resonances are fitted by a Fano-type profile to obtain accurate values for the position, width, and q parameter. C1 UNIV AMSTERDAM,PHYS CHEM LAB,1018 WS AMSTERDAM,NETHERLANDS. RP VANDERMEULEN, P (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 95 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 5997 EP 6009 DI 10.1103/PhysRevA.43.5997 PG 13 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600030 ER PT J AU MULLER, J BURGDORFER, J AF MULLER, J BURGDORFER, J TI DYNAMIC THRESHOLDS FOR THE EXISTENCE OF EXCITED ELECTRONIC STATES OF FAST IONS IN SOLIDS SO PHYSICAL REVIEW A LA English DT Article ID CHANNELED IONS; EXCITATION; WAKE AB We calculate eigenenergies for bound states of electrons in the dynamical screening potential of a fast charged particle traversing a solid by diagonalization of Hamiltonian matrices in a truncated Hilbert space of 600 hydrogenic basis states. Application of classical scaling invariances yields a universal energy-level diagram. A simple approximate formula for projectile-centered one-electron bound states is obtained. We find velocity thresholds for the existence of excited states which are in surprisingly good agreement with recent data by Chevallier et al. [Phys. Rev. A 41, 1738 (1990)]. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MULLER, J (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 24 TC 18 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 6027 EP 6031 DI 10.1103/PhysRevA.43.6027 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600033 ER PT J AU RAHN, LA FARROW, RL ROSASCO, GJ AF RAHN, LA FARROW, RL ROSASCO, GJ TI MEASUREMENT OF THE SELF-BROADENING OF THE H2 Q(0-5) RAMAN TRANSITIONS FROM 295 TO 1000 K SO PHYSICAL REVIEW A LA English DT Article ID ROTATIONAL ENERGY-TRANSFER; DOUBLE-RESONANCE MEASUREMENTS; FIELD-INDUCED SPECTRUM; Q-BRANCH; MOLECULAR-HYDROGEN; LINE-PROFILES; TEMPERATURE-DEPENDENCE; INELASTIC RATES; LAW ANALYSIS; COLLISIONS AB High-resolution inverse Raman spectroscopy has been used to measure the self-broadening coefficients of the Raman Q-branch transitions in pure (natural) hydrogen. Measurements of six lines [Q(0)-Q(5)] were made at pressures from 2 to 50 atm and from 295 to 1000 K. The dependence of the derived broadening coefficients on temperature and rotational quantum number is analyzed using the energy-corrected sudden scaling law [A. E. DePristo, J. Chem. Phys. 73, 2145 (1980)]. We discuss three models for the J dependence of the pure-vibrational dephasing and find that models with little or no J dependence in the pure-vibrational dephasing are preferred. C1 NIST,CTR CHEM TECHNOL,GAITHERSBURG,MD 20899. RP RAHN, LA (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. OI Rahn, Larry/0000-0002-4793-1158 NR 62 TC 65 Z9 65 U1 0 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 6075 EP 6088 DI 10.1103/PhysRevA.43.6075 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600040 ER PT J AU CUELLAR, LE FEIGERLE, CS CARMAN, HS COMPTON, RN AF CUELLAR, LE FEIGERLE, CS CARMAN, HS COMPTON, RN TI CIRCULAR-DICHROISM IN PHOTOELECTRON ANGULAR-DISTRIBUTIONS FOR THE 7P3/2 LEVEL OF CESIUM SO PHYSICAL REVIEW A LA English DT Note ID MULTIPHOTON IONIZATION; CONTINUOUS ABSORPTION; MOLECULES; ALIGNMENT; ATOMS; REGION AB Circular dichroism in photoelectron angular distributions (CDAD) is used to examine the alignment of the 7P3/2 and 7P1/2 levels of cesium, prepared by absorption of linearly polarized laser radiation. As expected, the 7P1/2 level exhibits no CDAD, whereas the 7P3/2 level shows a significant CDAD signal, although smaller than that predicted by theory. The difference between experiment and theory is attributed to mJ mixing due to hyperfine coupling during the finite ionization time of the laser pulse. C1 OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP CUELLAR, LE (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 20 TC 14 Z9 14 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 6437 EP 6440 DI 10.1103/PhysRevA.43.6437 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600090 ER PT J AU GRONBECHJENSEN, N LOMDAHL, PS SAMUELSEN, MR AF GRONBECHJENSEN, N LOMDAHL, PS SAMUELSEN, MR TI BIFURCATION AND CHAOS IN A DC-DRIVEN LONG ANNULAR JOSEPHSON JUNCTION SO PHYSICAL REVIEW B LA English DT Article ID SINE-GORDON SYSTEM; PHASE-LOCKING; DYNAMICS; MODEL AB Simulations of long annular Josephson junctions in a static magnetic field show that in large regions of bias current the system can exhibit a period-doubling bifurcation route to chaos. This is in contrast to previously studied Josephson-junction systems where chaotic behavior has primarily been observed in an external ac field. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. TECH UNIV DENMARK,PHYS LAB 1,DK-2800 LYNGBY,DENMARK. RP GRONBECHJENSEN, N (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 17 TC 45 Z9 45 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12799 EP 12803 PN A PG 5 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100012 ER PT J AU LI, Q CLEM, JR FINNEMORE, DK AF LI, Q CLEM, JR FINNEMORE, DK TI NUCLEATION AND MOTION OF AN ISOLATED ABRIKOSOV VORTEX SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING VORTEX; FORCE AB A new family of superconductor-normal-metal-insulator-superconductor (S/I/N/S) Josephson junctions have been developed in which a single Abrikosov vortex can be nucleated and systematically moved to selected positions. The location of the vortex within the junction is determined from the shape of the diffraction patterns. Methods have been developed to push the vortex to most any desired location within the junction by applying currents in either or both of the cross-strip legs of the junction. The elementary pinning force for a vortex in a pure Pb film was measured and found to be much smaller than for a Pb-Bi film. In addition, the vortex moves in much smaller steps for the Pb film than was found for the Pb-Bi films. For S/I/N/S junctions, the voltages and currents are in the microvolt and milliamp range; so very conventional detection can be used if a device is to be built based on the motion of a single Abrikosov vortex. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP LI, Q (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 11 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12843 EP 12847 DI 10.1103/PhysRevB.43.12843 PN A PG 5 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100018 ER PT J AU SANCHEZCASTRO, C BEDELL, KS AF SANCHEZCASTRO, C BEDELL, KS TI 2-COMPONENT FERMI LIQUIDS AND THE INDUCED-INTERACTION MODEL SO PHYSICAL REVIEW B LA English DT Article ID QUASIPARTICLE INTERACTION; METALLIC HYDROGEN; NUCLEAR-MATTER; SYSTEMS AB In this paper we generalize the induced-interaction equations to calculate quasiparticle interactions and scattering amplitudes for an arbitrary, two-component Fermi liquid. An application of this formalism to a two-band electron system, with relevance to heavy-fermion physics, will be subsequently presented in another paper. We include a review of the Landau theory for an arbitrary, charged two-component Fermi liquid with arbitrary Fermi momenta. This review includes equilibrium, dynamic, and transport properties. In the weak-coupling regime, it is shown how the results obtained from the random-phase approximation agree with Landau theory. 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 29 TC 6 Z9 6 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12874 EP 12887 DI 10.1103/PhysRevB.43.12874 PN A PG 14 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100022 ER PT J AU CRESPI, VH COHEN, ML PENN, DR AF CRESPI, VH COHEN, ML PENN, DR TI ANHARMONIC PHONONS AND THE ISOTOPE EFFECT IN SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Article ID OXYGEN ISOTOPE; YBA2CU3O7 AB Anharmonic interionic potentials are examined in an Einstein model to study the unusual isotope-effect exponents for the high-T(c) oxides. The mass dependences of the electron-phonon coupling constant-lambda and the average phonon frequency square-root are computed from weighted sums over the oscillator levels. The isotope-effect exponent is depressed below 1/2 by either a double-well potential or a potential with positive quadratic and quartic parts. Numerical solutions of Schrodinger's equation for double-well potentials produce lambda's in the range 1.5-4 for a material with a vanishing isotope-effect parameter-alpha. However, low phonon frequencies limit T(c) to roughly 15 K. A negative quartic perturbation to a harmonic well can increase-alpha above 1/2. In the extreme-strong-coupling limit, alpha is 1/2, regardless of anharmonicity. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP CRESPI, VH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Crespi, Vincent/0000-0003-3846-3193 NR 14 TC 31 Z9 31 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12921 EP 12924 DI 10.1103/PhysRevB.43.12921 PN A PG 4 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100027 ER PT J AU SALES, BC CHAKOUMAKOS, BC AF SALES, BC CHAKOUMAKOS, BC TI HOLE FILLING AND HOLE CREATION IN THE SUPERCONDUCTING COMPOUNDS BI2SR2-XRXCUO6+Y (R = LA, PR, ND, AND SM) SO PHYSICAL REVIEW B LA English DT Article ID CU-O SYSTEM; OXYGEN-CONTENT; TC; TEMPERATURE; PHASES; BI2SR2-XLAXCUO6+DELTA; VALENCE AB The superconducting properties, hole content, and lattice constants of several rare-earth-doped compounds Bi2Sr(2-x)R(x)CuO6+y have been investigated as a function of rare-earth doping and oxygen content. The maximum superconducting transition temperature, T(c), obtained for each of the rare-earth dopants was 23 K (La), 25 K (Pr), 21 K (Nd), and 12 K (Sm). The T(c)'s of these compounds exhibited a parabolic dependence on the La and Pr concentration (0 < x < 1), with the maximum T(c) occurring for x = 0.4 for samples with low oxygen content. For La- and Pr-doped samples treated in pure oxygen, the position of the maximum shifted to x = 0.6 and 0.5, respectively, with a concurrent reduction in the maximum value for T(c) (17 K for La and 18 K for Pr). For x > 0.2, the samples were single phase and exhibited unusually sharp superconducting transitions (width of acsusceptibility transition less than 2 K). The high quality of the samples allowed a precise study of the variation of the orthorhombic cell parameters with the rare-earth and oxygen content. The oxygen content of the samples was systematically varied using oxygen partial pressures that ranged from 100 ppm to 100% oxygen during the heat treatments. Absolute values of the oxygen content and the changes of the oxygen content with heat treatments were determined using thermogravimetric analysis. The qualitative features of the dependence of T(c) on x and y can be understood by assuming an excess of holes in the Cu-O planes of the undoped compound that are filled by the extra electrons contributed with rare-earth doping or increased with the addition of oxygen. For La-doped samples treated in pure oxygen there was a smooth variation of T(c) with hole content, with the maximum T(c) (18 K) occurring at a hole content of 0.2 +/- 0.02. For La-doped samples treated in 0.1% oxygen, the maximum T(c) occurred at the same hole content (0.2), but the value of T(c) was significantly higher (23 K). These data illustrate that, even within one alloy system, composition can affect T(c) as well as hole content. Finally, lattice-constant and oxygen-content data from the Pr-doped materials suggest that Pr substituted onto the Sr site has a formal valence of approximately 3.3. RP SALES, BC (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 35 TC 37 Z9 37 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12994 EP 13000 DI 10.1103/PhysRevB.43.12994 PN A PG 7 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100037 ER PT J AU VANDERBEEK, CJ KES, PH AF VANDERBEEK, CJ KES, PH TI DISLOCATION-MEDIATED FLUX CREEP IN BI2SR2CACU2O8+DELTA SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; SINGLE-CRYSTAL BI2SR2CACU2O8; II SUPERCONDUCTORS; IRREVERSIBILITY LINE; PENETRATION DEPTH; LATTICE; FLOW; DEPENDENCE; FIELD; FILM AB We have investigated the possible role of two-dimensional vortex-lattice defects in thermally assisted flux flow for the very anisotropic high-temperature superconductor Bi2Sr2CaCu2O8+delta (Bi-Sr-Ca-Cu-O). At low current densities, this mechanism, which we shall refer to as plastic flux creep, is expected to prevail over creep of elastically correlated flux bundles, or elastic creep. It is assumed that vortices are pinned by oxygen vacancies, for which the elementary interaction is obtained. Measurements of the ac susceptibility in an applied dc field, B(c1) < mu-0H < 0.2B(c2), carried out using a sufficiently low driving-field amplitude, were performed on a Bi-Sr-Ca-Cu-O single-crystalline sample It is shown that under the above assumptions the experimental data may be consistently interpreted. The field dependence of the activation barrier is explained. Furthermore, the irreversibility line is reproduced, as well as the shape of the ac-susceptibility transition. Deviations from the plastic-flux-creep model can be qualitatively understood using a criterion describing the crossover to elastic flux creep. C1 UNIV CALIF LOS ALAMOS SCI LAB,ERDC,LOS ALAMOS,NM 87545. RP VANDERBEEK, CJ (reprint author), LEIDEN STATE UNIV,KAMERLINGH ONNES LAB,POB 9506,2312 AV LEIDEN,NETHERLANDS. NR 44 TC 140 Z9 140 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13032 EP 13041 DI 10.1103/PhysRevB.43.13032 PN A PG 10 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100042 ER PT J AU VANDERVOORT, KG WELP, U KESSLER, JE CLAUS, H CRABTREE, GW KWOK, WK UMEZAWA, A VEAL, BW DOWNEY, JW PAULIKAS, AP LIU, JZ AF VANDERVOORT, KG WELP, U KESSLER, JE CLAUS, H CRABTREE, GW KWOK, WK UMEZAWA, A VEAL, BW DOWNEY, JW PAULIKAS, AP LIU, JZ TI MAGNETIC MEASUREMENTS OF THE UPPER AND LOWER CRITICAL FIELDS OF OXYGEN-DEFICIENT YBA2CU3O7-DELTA SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING TRANSITION-TEMPERATURE; NONSTOICHIOMETRIC SAMPLES; UNTWINNED YBA2CU3O7-DELTA; ELECTRONIC BEHAVIOR; PINNING FORCES; DEPENDENCE; ANISOTROPY; STATE; 0.04-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1.00; BA2YCU3O7-DELTA AB We present dc-magnetization measurements in fields up to 5 T on oxygen-deficient (T(c) congruent-to 60 K) YBa2Cu3O7-delta single crystals. The upper-critical-field slopes are -2.0 and -8.7 T/K and the lower critical fields at 5 K are 83 and 25 Oe for fields perpendicular and parallel to the Cu-O planes, respectively The upper-critical-field slope anisotropy is not substantially different from the anisotropy found for the 90-K crystals. The H(c1) values are, however, much smaller for the 60-K crystals. We explain these results through a model in which the chains do not contribute significantly to the coupling between the Cu-O planes but rather serve as a charge reservoir for the superconductivity that occurs in the planes. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV ILLINOIS,CHICAGO,IL 60680. UNIV ALBERTA,EDMONTON T6G 2J1,ALBERTA,CANADA. RP VANDERVOORT, KG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 47 TC 43 Z9 43 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13042 EP 13048 DI 10.1103/PhysRevB.43.13042 PN A PG 7 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100043 ER PT J AU XU, M SHI, DL UMEZAWA, A VANDERVOORT, KG CRABTREE, GW AF XU, M SHI, DL UMEZAWA, A VANDERVOORT, KG CRABTREE, GW TI FULL-PENETRATION TEMPERATURE AND MAGNETIC-RELAXATION IN A SINGLE-CRYSTAL OF BI2SR2CACU2OX SO PHYSICAL REVIEW B LA English DT Article ID BA-CU-O; ACTIVATED FLUX MOTION; SUPERCONDUCTORS; CREEP; STATE; IRREVERSIBILITY; MODEL AB We have developed the concept of a characteristic temperature T* at which the flux first fully penetrates the sample. Based on this concept, we have interpreted the effects of the temperature on the magnetic relaxation that have been measured in a single crystal of Bi2Sr2CaCu2Ox in a broad range of temperature (5-35 K) and applied magnetic field (0.1-4 kG). The magnetic relaxation exhibits a clear peak in the dM/d lnt-versus-temperature plot, and the peak position is highly affected by the applied field. We have also interpreted the peak shift of dM/d lnt with different fields in terms of the flux-creep and the critical-state models. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. NR 18 TC 26 Z9 26 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13049 EP 13052 DI 10.1103/PhysRevB.43.13049 PN A PG 4 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100044 ER PT J AU ONOZUKA, T IWABUCHI, Y FUKASE, T SATO, H MITCHELL, TE AF ONOZUKA, T IWABUCHI, Y FUKASE, T SATO, H MITCHELL, TE TI STRUCTURAL-CHANGES OF BI1.8SR2(CA1-XYX)CU2.2OZ CERAMICS WITH YTTRIUM CONTENT STUDIED BY ELECTRON-DIFFRACTION AND HIGH-RESOLUTION ELECTRON-MICROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID SR-CU-O; HIGH-TC SUPERCONDUCTOR; X-RAY-DIFFRACTION; MODULATED STRUCTURE; MAGNETIC-PROPERTIES; HOLE CONCENTRATION; SYSTEM; BI2SR2CA1-XYXCU2OY; SUPERSTRUCTURE; LONG AB The mode of the incommensurate modulation in the b direction of the Bi1.8Sr2(Ca(1-x)Y(x))Cu2.2O(z) (0.05 < x < 0.75) system is investigated by means of electron diffraction and high-resolution lattice imaging. The change of period of the long-period structure with x is found to be basically due to the mixing ratio of domains of two modulation periods with b = 4.5b0 and 5b0 or 4.5b0 and 4b0, thus creating periods of b = 4.75b0-4.0b0. The fundamental orthorhombic lattice has dimensions of a congruent-to b congruent-to b0 (0.54 nm) and c congruent-to c0 (3.1 nm). The change of the mixing mode from one to the other mentioned above occurs just in the yttrium concentration range, 0.45 < x < 0.65, which also corresponds to the superconductor (metallic)-to-semiconductor transition boundary. The mixing modes of the domains are directly recorded as a contrast modulation with half periods, 4.5b0/2 and 5b0/2 or 4.5b0/2 and 4b0/2 in high-resolution lattice images. These images are reproduced well by a multislice computer-simulation technique. C1 PURDUE UNIV,SCH MAT ENGN,W LAFAYETTE,IN 47907. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP ONOZUKA, T (reprint author), TOHOKU UNIV,INST MAT RES,SENDAI,MIYAGI 980,JAPAN. NR 26 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13066 EP 13072 DI 10.1103/PhysRevB.43.13066 PN A PG 7 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100047 ER PT J AU BEYERMANN, WP HUNDLEY, MF CANFIELD, PC THOMPSON, JD LATROCHE, M GODART, C SELSANE, M FISK, Z SMITH, JL AF BEYERMANN, WP HUNDLEY, MF CANFIELD, PC THOMPSON, JD LATROCHE, M GODART, C SELSANE, M FISK, Z SMITH, JL TI COMPETING INTERACTIONS IN THE HEAVY-ELECTRON ANTIFERROMAGNETS CEM2SN2 (M = NI, IR, CU, RH, PD, AND PT) SO PHYSICAL REVIEW B LA English DT Article ID KONDO AB Specific-heat, magnetic-susceptibility, and resistivity measurements on annealed polycrystalline samples of CeM2Sn2, with M = Ni, Ir, Cu, Rh, Pd, and Pt, indicate that each of these compounds orders antiferromagnetically at Neel temperatures T(N) between approximately 0. 5 and 4.2 K. Just above T(N), all these materials have a significant enhancement of their electronic specific heat, which can be as large as 3-4 J/mol K2. We discuss the role of critical fluctuations on the specific heat and argue that the enhancement is associated with a large effective mass and not fluctuations. The anomalously low ordering temperatures and very large electronic specific heat suggest that T(N) and the Kondo temperature T(K) are comparable, making these materials particularly attractive for studying the competition between Kondo and Ruderman-Kittel-Kasuya-Yosida interactions. Measurements of the pressure dependence of T(N) in CeIr2Sn2 were performed to explore this competition, which is discussed in terms of Doniach's Kondo-necklace model. C1 CNRS,F-92190 MEUDON,FRANCE. RP BEYERMANN, WP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014; LATROCHE, MICHEL/L-6254-2014 OI LATROCHE, MICHEL/0000-0002-8677-8280 NR 17 TC 58 Z9 58 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13130 EP 13136 DI 10.1103/PhysRevB.43.13130 PN A PG 7 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100055 ER PT J AU LIN, H REBELSKY, L COLLINS, MF GARRETT, JD BUYERS, WJL AF LIN, H REBELSKY, L COLLINS, MF GARRETT, JD BUYERS, WJL TI MAGNETIC-STRUCTURE OF UNI2SI2 SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-DIFFRACTION; INTERMETALLIC SYSTEMS; UCU2SI2; MODEL AB The magnetic ordering and phase transitions have been studied in UNi2Si2 single crystals by neutron diffraction. Three distinct ordered phases are observed, all with magnetic moments along the c axis. The high-temperature (103 < T< 124 K) phase is an incommensurate longitudinal spin-density wave with temperature-dependent wave vector. At 110 K, q = (0,0,0.745 +/- 0.002). The intermediate temperature (53 < T < 103 K) phase is a simple body-centered antiferromagnet with a moment of (1.6 +/- 0.3)mu-B. The low-temperature phase shows a similar scattering pattern to that of the high-temperature phase with q = (0,0, 2/3 ), and with extra scattering at the nuclear Bragg peaks corresponding to a ferromagnetic moment mu-z of (1.0 +/- 0.3)mu-B per uranium atom. This pattern can be interpreted either as a longitudinal spin-density wave with maximum moment mu-0 = (2.7 +/- 0.3)mu-B and a ferromagnetic component or as a squared-up wave with uranium moments of 2.22-mu-B, two thirds of which are along +z and one third along -z. Hysteresis is observed in the low-temperature phase transition. The phase transitions at 53 and 103 K are both first order. At 124 +/- 1 K there is a critical phase transition to the paramagnetic state with beta = 0. 35 +/- 0.03. Above 124 K conventional critical scattering is observed centered on the wave vector q. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. MCMASTER UNIV,INST MAT RES,HAMILTON L8S 4M1,ONTARIO,CANADA. ATOM ENERGY CANADA LTD,CHALK RIVER NUCL LABS,CHALK RIVER K0J 1J0,ONTARIO,CANADA. RP LIN, H (reprint author), MCMASTER UNIV,DEPT PHYS,HAMILTON L8S 4M1,ONTARIO,CANADA. NR 16 TC 57 Z9 57 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13232 EP 13239 DI 10.1103/PhysRevB.43.13232 PN A PG 8 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100067 ER PT J AU RICKMAN, JM JASZCZAK, JA AF RICKMAN, JM JASZCZAK, JA TI CALCULATION OF ELASTIC-CONSTANTS FROM A REPLICA MONTE-CARLO SIMULATION SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; GRAIN-BOUNDARIES; METALS AB A Monte Carlo method, combining a replica Monte Carlo simulation with a cumulant analysis of the generated replica energies, is employed in order to calculate efficiently and accurately the second-order, isothermal elastic constants of a defect-free, Lennard-Jones crystal. The advantages of this method are that it is easy to implement, that it does not require the calculation of stresses or their strain derivatives, and that only one constant-strain simulation is required. It is shown that other methods presently used to calculate elastic constants can be regarded, more generally, as alternative, cumulant expansions. This method is further extended to calculate higher-order elastic constants and, in particular, the dependence of the bulk modulus on strain. RP RICKMAN, JM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 20 TC 6 Z9 6 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13285 EP 13293 DI 10.1103/PhysRevB.43.13285 PN B PG 9 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200004 ER PT J AU GOODING, RJ YE, YY CHAN, CT HO, KM HARMON, BN AF GOODING, RJ YE, YY CHAN, CT HO, KM HARMON, BN TI ROLE OF NON-SYMMETRY-BREAKING ORDER PARAMETERS IN DETERMINING THE MARTENSITIC ENERGY BARRIER - THE BCC-TO-9R TRANSFORMATION SO PHYSICAL REVIEW B LA English DT Note ID PHASE-TRANSITION; ALLOYS AB Distortions that do not affect the symmetry of the final product phase obtained in a martensitic transition, so-called non-symmetry-breaking order parameters, but that do affect the energy barrier encountered during homogeneous nucleation, are considered. For the bcc-to-9R transition undergone by Na, first-principles total-energy calculations verify the importance of these distortions in that a 40% reduction is obtained when the non-symmetry-breaking order parameters are allowed to alter the transformation path defined only by the symmetry-breaking order parameters. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES LAB,AMES,IA 50011. RP GOODING, RJ (reprint author), QUEENS UNIV,DEPT PHYS,KINGSTON K7L 3N6,ONTARIO,CANADA. NR 14 TC 27 Z9 27 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13626 EP 13629 DI 10.1103/PhysRevB.43.13626 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200050 ER PT J AU CROMMIE, MF CRAIG, K SHERWIN, MS ZETTL, A AF CROMMIE, MF CRAIG, K SHERWIN, MS ZETTL, A TI EFFECT OF RANDOM NOISE ON A MODE-LOCKED SYSTEM SO PHYSICAL REVIEW B LA English DT Note ID CHARGE-DENSITY WAVES; DISSIPATIVE SYSTEMS; TRANSITION; RESONANCES; DYNAMICS; LOCKING; CHAOS; MAPS AB We have experimentally added white noise to an analog Josephson-junction simulator in the mode-locked state. The Poincare sections and power spectra of the analog simulator have been reconstructed from the resultant time-series data. A classical form of noise squeezing is observed. In addition, the power spectra associated with noisy motion about the subharmonic fixed points in the simulator's Poincare section are found to be Lorentzian in shape. These observations are well accounted for by a theory of noisy mode-locked dynamics recently developed by Wiesenfeld and C1 UNIV CALIF SANTA BARBARA,CTR NONLINEAR SCI,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP CROMMIE, MF (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 11 TC 2 Z9 2 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13699 EP 13702 DI 10.1103/PhysRevB.43.13699 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200073 ER PT J AU SHARMA, RP REHN, LE BALDO, PM AF SHARMA, RP REHN, LE BALDO, PM TI COMPARISON OF P-CHANNELING AND HE CHANNELING ACROSS TC IN YBA2CU3O7-X SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTING TRANSITION; ION AB Measurements are reported for the temperature dependence of both the minimum yield and critical angle during ion channeling with proton (p) and He-4 beams, in high-quality single crystals of YBa2Cu3O7-x. Rutherford backscattering and characteristic x-ray yields were acquired between 25 and 300 K, with primary attention given to temperatures near the superconducting transition T(c). For both p and He channeling, an abrupt increase (approximately 7%) in the critical angle and a decrease (less-than-or-similar-to 10%) in the minimum yield were found as the specimen temperature was lowered through T(c). No evidence was found for an increase in minimum yield at T(c), as reported previously for deuterium channeling in YBa2Cu3O7-x [T. Haga et al., Phys. Rev. B 41, 826 (1990)). The x-ray results confirm that the anomalous changes found across T(c) involve only displacements of the Cu(1 and 2) and O(4) atoms. RP SHARMA, RP (reprint author), ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 10 TC 8 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13711 EP 13713 DI 10.1103/PhysRevB.43.13711 PN B PG 3 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200076 ER PT J AU ZHAO, ZY BEHROOZI, F ADENWALLA, S GUAN, Y KETTERSON, JB SARMA, BK HINKS, DG AF ZHAO, ZY BEHROOZI, F ADENWALLA, S GUAN, Y KETTERSON, JB SARMA, BK HINKS, DG TI CRITICAL FIELDS AND LANDAU-GINZBURG PARAMETERS OF THE HEAVY-FERMION SUPERCONDUCTOR UPT3 SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC-FIELD; PHASE-DIAGRAM; TRANSITION AB Measurements of both the lower and upper critical fields along all three principal axes of the heavy-fermion superconductor UPt3 have been performed. A kink in the temperature dependence of the lower critical field, H(c1), is observed for all three orientations, which is in agreement with a recent theory by Hess, Tokuyasu, and Sauls. Also, an anisotropy of the temperature dependence of the lower critical field is observed at low temperatures (T < 290 mK). The Landau-Ginzburg parameters are estimated from the experimental results. C1 UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53201. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ZHAO, ZY (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Ketterson, John/B-7234-2009 NR 13 TC 17 Z9 17 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13720 EP 13723 DI 10.1103/PhysRevB.43.13720 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200079 ER PT J AU BUSSMANNHOLDER, A BISHOP, AR BATISTIC, I AF BUSSMANNHOLDER, A BISHOP, AR BATISTIC, I TI UNCONVENTIONAL ELECTRON-PHONON INTERACTIONS IN HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID STRUCTURAL PHASE-TRANSITIONS; HIGH-TC SUPERCONDUCTIVITY; OXYGEN ISOTOPE; POLARIZABILITY MODEL; FERROELECTRICITY; YBA2CU3O7; EXCITATIONS; SYSTEMS; ORIGIN AB The infrared absorption of the 155-cm-1 c-axis mode of YBa2Cu3O7 is calculated on the basis of an anharmonic-electron-phonon-interaction model and a large enhancement of its intensity is obtained. A double-well potential in the electron-phonon interaction gives the right order of magnitude for shifts in the bridging O(4) position in agreement with recent extended x-ray-absorption fine-structure data. Electron-density-two-phonon-interaction terms are derived which represent a violation of the Migdal theorem and a BCS-type superconducting state with nonlinearly enhanced electron-phonon coupling is expected together with an anisotropy of the superconducting energy gap. C1 UNIV BAYREUTH,W-8580 BAYREUTH,GERMANY. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BUSSMANNHOLDER, A (reprint author), MAX PLANCK INST FESTKORPERFORSCH,HEISENBERGSTR 1,W-7000 STUTTGART 80,GERMANY. NR 41 TC 33 Z9 33 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13728 EP 13731 DI 10.1103/PhysRevB.43.13728 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200081 ER PT J AU CIVALE, L MCELFRESH, MW MARWICK, AD HOLTZBERG, F FEILD, C THOMPSON, JR CHRISTEN, DK AF CIVALE, L MCELFRESH, MW MARWICK, AD HOLTZBERG, F FEILD, C THOMPSON, JR CHRISTEN, DK TI SCALING OF THE HYSTERETIC MAGNETIC-BEHAVIOR IN YBA2CU3O7 SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Note ID CU-O CRYSTAL; FLUX CREEP; GLASS MODEL; SUPERCONDUCTORS; IRREVERSIBILITY; CURRENTS; FIELD AB We have studied the pinning force F(p)(B,T) in YBa2Cu3O7 crystals as a function of fluence of 3-MeV protons. For a given ion-damage level, we could reduce all F(p) data to a single function of reduced field b = B/B*, where the scaling field B*(T) << H(c2)(T) is related to the irreversibility line. This result rules out the possibility of matching effects between the vortex lattice and the distribution of pinning sites. We emphasize the influence of thermally activated relaxation in the determination of F(p) and compare the data with simple pinning models. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CIVALE, L (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. RI Christen, David/A-9709-2008 NR 26 TC 100 Z9 104 U1 3 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13732 EP 13735 DI 10.1103/PhysRevB.43.13732 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200082 ER PT J AU MCCARTY, KF RADOUSKY, HB LIU, JZ SHELTON, RN AF MCCARTY, KF RADOUSKY, HB LIU, JZ SHELTON, RN TI TEMPERATURE-DEPENDENCE OF THE LINEWIDTHS OF THE RAMAN-ACTIVE PHONONS OF YBA2CU3O7 - EVIDENCE FOR A SUPERCONDUCTING GAP BETWEEN 440 AND 500 CM-1 SO PHYSICAL REVIEW B LA English DT Note ID SINGLE-CRYSTAL YBA2CU3O7-DELTA; INELASTIC-NEUTRON-SCATTERING; POLARIZATION; ANISOTROPY; DENSITY; NB3SN AB The linewidths and frequencies of three Raman-active phonons have been measured in twin-free single crystals of YBa2Cu3O7. Below T(c), the phonon at 340 cm-1 sharpens dramatically, the phonon at 440 cm-1 sharpens slightly, and the phonon at 500 cm-1 broadens. The temperature dependence of the phonon linewidths places the superconducting energy gap (2-DELTA) between 440 and 500 cm-1, or 2-DELTA = (6.8-7.7)k(B)T(c). Based upon the observed change in linewidth, the electron-phonon coupling strength of the 340-cm-1 phonon is estimated to be between 0.6 and 0.8. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP MCCARTY, KF (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 23 TC 50 Z9 50 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13751 EP 13754 DI 10.1103/PhysRevB.43.13751 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FP632 UT WOS:A1991FP63200087 ER PT J AU CHATURVEDI, L ZHAO, X RAMAYYA, AV HAMILTON, JH KORMICKI, J ZHU, S GIRIT, C XIE, H GAO, WB JIANG, YR PETROVICI, A SCHMID, KW FAESSLER, A JOHNSON, NR BAKTASH, C LEE, IY MCGOWAN, FK HALBERT, ML RILEY, MA MCNEILL, JH KORTELAHTI, MO COLE, JD PIERCEY, RB JIN, HQ AF CHATURVEDI, L ZHAO, X RAMAYYA, AV HAMILTON, JH KORMICKI, J ZHU, S GIRIT, C XIE, H GAO, WB JIANG, YR PETROVICI, A SCHMID, KW FAESSLER, A JOHNSON, NR BAKTASH, C LEE, IY MCGOWAN, FK HALBERT, ML RILEY, MA MCNEILL, JH KORTELAHTI, MO COLE, JD PIERCEY, RB JIN, HQ TI TESTS OF MICROSCOPIC CALCULATIONS OF MULTIPLE BAND STRUCTURES AND LARGE DEFORMATIONS IN GE-68 AND SE-72 SO PHYSICAL REVIEW C LA English DT Article ID NUCLEAR-STRUCTURE; COEXISTENCE AB High-spin states in Ge-68 and Se-72 have been studied by in-beam, gamma-ray spectroscopy. In Ge-68 the three known bands beginning at 8+ are found to exhibit crossing transitions and other new positive-parity bands are discovered to feed into them. In Se-72 only a single positive-parity yrast band is seen to high spin. Detailed, more realistic microscopic model calculations have been carried out for Ge-68 and Se-72. There is striking agreement between the calculations and the new data for Ge-68, including a predicted new band with superdeformation, beta approximately 0.42. The calculations for Se-72 predict similar multiple band structures that are not seen experimentally. C1 VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235. UNIV TUBINGEN,INST THEORET PHYS,W-7400 TUBINGEN 1,GERMANY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. LOUISIANA STATE UNIV,DEPT PHYS,BATON ROUGE,LA. IDAHO NUCL ENGN LAB,IDAHO FALLS,ID. MISSISSIPPI STATE UNIV,DEPT PHYS,MISSISSIPPI STATE,MS 39762. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. NR 14 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2541 EP 2545 DI 10.1103/PhysRevC.43.2541 PG 5 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800009 ER PT J AU HENSLEY, DC GROSS, EE HALBERT, ML BEENE, JR BERTRAND, FE VOURVOPOULOS, G HUMPHREY, DL AF HENSLEY, DC GROSS, EE HALBERT, ML BEENE, JR BERTRAND, FE VOURVOPOULOS, G HUMPHREY, DL TI MG-26 NUCLEAR-STRUCTURE FROM MG-26(200 MEV)+PB-208 SCATTERING SO PHYSICAL REVIEW C LA English DT Article ID MOMENTS; MODEL AB Differential cross sections are reported for elastic scattering and for exciting the 2(1)+ (1.81 MeV), 2(2)+ (2.94 MeV), 4(1)+ (4.32 MeV), and the 4(2)+ (4.90 MeV) states of Mg-26 from Mg-26 (200 MeV) + Pb-208 scattering. In addition, we have measured complete particle-gamma angular correlations for the 2(1)+ --> 0(1)+, 2(2)+ --> 2(1)+, and 4(2)+ --> 2(1)+ gamma-decays. Coupled-channels analysis was performed to extract E2 and E4 matrix elements. For the ground-state rotational band we find M(E2;0(1)+ <--> 2(1)+) = -16.79 +/- 0.13 e fm2, M(E4;0(1)+ <--> 4(2)+) = +95 +/- 10 e fm4, and Q2(2(1)+) = -20.9 +/- 1.9 e fm2, where we have identified the 4(2)+ (4.90 MeV) state as a member of the ground-state band rather than the 4(1)+ (4.32 MeV) state. The 2(2)+ (2.94 MeV) state is not well accounted for by the asymmetric-rotor model. C1 WESTERN KENTUCKY UNIV,BOWLING GREEN,KY 42101. RP HENSLEY, DC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 22 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2546 EP 2553 DI 10.1103/PhysRevC.43.2546 PG 8 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800010 ER PT J AU HILL, JC SCHWELLENBACH, DD WOHN, FK WINGER, JA GILL, RL OHM, H SISTEMICH, K AF HILL, JC SCHWELLENBACH, DD WOHN, FK WINGER, JA GILL, RL OHM, H SISTEMICH, K TI STRUCTURE OF HIGHLY DEFORMED ZR-102 POPULATED IN DECAY OF LOW-SPIN AND HIGH-SPIN ISOMERS OF Y-102 SO PHYSICAL REVIEW C LA English DT Article ID SHELL-MODEL DESCRIPTION; EVEN EVEN NUCLEI; SHAPE COEXISTENCE; INTRUDER STATES; LEVEL STRUCTURE; DEFORMATION; ISOTOPES; FISSION; SR-98; IDENTIFICATION AB The decay of low- and high-spin isomers of 102Y to levels in highly deformed 102Zr was studied from mass-separated activity produced by thermal neutron fission of U-235 . Based on gamma-singles and coincidence measurements, decay schemes for both isomers are deduced. Of special interest are states observed at 894 and 1211 keV that are postulated to be 0(2)+ and 2(2)+, respectively. Possible interpretations of these newly observed levels in terms of beta, gamma, or spherical bands are given. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. BROOKHAVEN NATL LAB,UPTON,NY 11973. FORSCHUNGSZENTRUM JULICH,INST KERNPHYS,W-5170 JULICH,GERMANY. RP HILL, JC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 29 TC 15 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2591 EP 2598 DI 10.1103/PhysRevC.43.2591 PG 8 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800016 ER PT J AU CIVITARESE, O DUMRAUF, AG REBOIRO, M RING, P SHARMA, MM AF CIVITARESE, O DUMRAUF, AG REBOIRO, M RING, P SHARMA, MM TI EFFECT OF PAIRING ON BREATHING MODE AND NUCLEAR-MATTER COMPRESSIBILITY SO PHYSICAL REVIEW C LA English DT Article ID INELASTIC ALPHA-SCATTERING; GIANT MONOPOLE RESONANCE; FINITE TEMPERATURE; EXCITATIONS AB The systematics of the giant monopole resonance in even-mass Sn isotopes have been studied in the framework of the quasiparticle random-phase approximation. The effect of the inclusion of pairing correlations on the properties of the giant monopole and giant quadrupole resonances in superfluid Sn nuclei has been evaluated. A shift in the monopole energies of these nuclei by about 100-150 keV has been observed. It is shown that the shift in the energy of the breathing mode of finite superfluid nuclei influences the extraction of the nuclear matter compressibility from empirical data only minimally. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV DELHI,DEPT PHYS & ASTROPHYS,DELHI 110007,INDIA. UNIV MUNICH,SEKT PHYS,W-8046 GARCHING,GERMANY. TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. RP CIVITARESE, O (reprint author), UNIV LA PLATA,DEPT PHYS,RA-1900 LA PLATA,ARGENTINA. RI Ring, Peter/O-1638-2015; OI Reboiro, Marta/0000-0002-9598-7770 NR 32 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2622 EP 2630 DI 10.1103/PhysRevC.43.2622 PG 9 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800020 ER PT J AU CHACON, AD BISTIRLICH, JA BOSSINGHAM, RR BOSSY, H BOWMAN, HR CLAWSON, CW CROWE, KM HUMANIC, TJ JUSTICE, M KAMMEL, P KURCK, JM LJUNGFELT, S MEYER, CA PETITJEAN, C RASMUSSEN, JO STOYER, MA HASHIMOTO, O MCHARRIS, WC SULLIVAN, JP WOLF, KL ZAJC, WA AF CHACON, AD BISTIRLICH, JA BOSSINGHAM, RR BOSSY, H BOWMAN, HR CLAWSON, CW CROWE, KM HUMANIC, TJ JUSTICE, M KAMMEL, P KURCK, JM LJUNGFELT, S MEYER, CA PETITJEAN, C RASMUSSEN, JO STOYER, MA HASHIMOTO, O MCHARRIS, WC SULLIVAN, JP WOLF, KL ZAJC, WA TI PION CORRELATIONS IN RELATIVISTIC HEAVY-ION COLLISIONS FOR 3 SYMMETRICAL SYSTEMS SO PHYSICAL REVIEW C LA English DT Article ID INTRANUCLEAR CASCADE MODEL; NUCLEAR COLLISIONS; LIGHT FRAGMENTS; INTERFEROMETRY; DYNAMICS; AR; SIMULATION; MECHANISM; PARTICLES; MOMENTUM AB The method of two-pion interferometry was used to obtain source-size and lifetime parameters for the pions produced in heavy ion collisions. Two acceptances (centered at approximately 0-degrees and approximately 90-degrees, in the center of mass) were used for each of three systems, 1.70 GeV/nucleon Fe-56 + Fe, 1.82 GeV/nucleon Ar-40 + KCl, and 1.54 GeV/nucleon Nb-93 + Nb, allowing a search for dependences on nuclear mass and viewing angle. The correlation functions were calculated by comparing data samples to event-mixed reference samples. The effect of the particle correlations on the reference samples was corrected by weighting the events appropriately to remove the residual correlation effect. The source parameters, in the nucleus-nucleus center-of-mass frame, show an oblate source (i.e., R perpendicular-to > R parallel-to) for the lighter systems and an approximately spherical source for the heaviest system. The dependence on nuclear mass shows that R perpendicular-to is essentially constant (under both viewing angles), whereas R parallel-to for the 90-degrees (c.m.) data increases with the nuclear mass. No evidence was found for a dependence of the source size on the pion momentum. C1 UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. MICHIGAN STATE UNIV,E LANSING,MI 48824. TEXAS A&M UNIV SYST,INST CYCLOTRON,COLLEGE STN,TX 77843. COLUMBIA UNIV,NEW YORK,NY 10027. RP CHACON, AD (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 55 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2670 EP 2688 DI 10.1103/PhysRevC.43.2670 PG 19 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800026 ER PT J AU DELCAMPO, JG AUBLE, RL BEENE, JR HALBERT, ML KIM, HJ DONOFRIO, A CHARVET, JL AF DELCAMPO, JG AUBLE, RL BEENE, JR HALBERT, ML KIM, HJ DONOFRIO, A CHARVET, JL TI POPULATIONS OF EXCITED-STATES AND REACTION-MECHANISMS IN THE EMISSION OF COMPLEX FRAGMENTS FOR COLLISIONS OF NI-58+NI-58 AT 11 MEV NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID TEMPERATURES; MEV/NUCLEON; DECAY AB Cross sections for emission of complex fragments (Z > 2) in their ground and excited states are presented for the reaction Ni-58 + Ni-58 at a bombarding energy of 630 MeV. Measurements of energy spectra, angular distributions, and angle-integrated cross sections were made for fragments of Z = 4 to 20. Gamma-rays emitted in coincidence with the fragments were measured in a 4-pi geometry using 62 NaI detectors and 8 Compton-suppressed germanium detectors. Data presented are mostly for the cross sections extracted by gamma-ray techniques. A simple statistical approach to associate the ratio of cross sections for excited states and ground states to the temperature of the emitter fails to give the expected temperatures. However, it is shown that this is mostly due to the fact that the fragments that gamma-decay are secondary fragments produced by particle decay of the primary fragments. A Hauser-Feshbach analysis accounts well for the fragment cross sections, energy spectra, and extracted temperatures, provided that evaporation from the primary fragments is included. C1 IST NAZL FIS NUCL,I-80125 NAPLES,ITALY. CTR ETUDES SACLAY,SERV PHYS NUCL BASSE ENERGIE,F-91191 GIF SUR YVETTE,FRANCE. RP DELCAMPO, JG (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 19 TC 40 Z9 40 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2689 EP 2695 PG 7 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800027 ER PT J AU BAKER, SI ALLEN, RA YURISTA, P AGORITSAS, V CUMMING, JB AF BAKER, SI ALLEN, RA YURISTA, P AGORITSAS, V CUMMING, JB TI CU(P,X)NA-24 CROSS-SECTION FROM 30 TO 800 GEV SO PHYSICAL REVIEW C LA English DT Note ID NUCLEAR-REACTIONS; 300-GEV PROTONS; SILVER; AU-197 AB The Cu(p,X)Na-24 cross section was measured at energies of 30, 150, 400, and 800 GeV. Proton fluences were determined with beam current transformer systems which were calibrated electrically in situ. The Na-24 produced in Cu targets was assayed by comparing the intensity of its 1368-keV gamma-ray with that of the 1332-keV gamma-ray from Co-60 standard sources. Results are consistent with an energy-independent cross section of 3.59 +/- 0.14 mb. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Cumming, James/I-3358-2013 OI Cumming, James/0000-0001-6930-0958 NR 13 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2862 EP 2865 DI 10.1103/PhysRevC.43.2862 PG 4 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800048 ER PT J AU ZAMFIR, NV AF ZAMFIR, NV TI NONPAIRING LIKE-NUCLEON VALENCE RESIDUAL INTERACTIONS SO PHYSICAL REVIEW C LA English DT Note AB Nonpairing like-nucleon residual interactions, delta-V(nn) and delta-V(pp), of the last two neutrons or protons are extracted from double differences of nuclear binding energies for all even-even nuclei. They are found to be weakly repulsive and, combined with analogous information on p-n interactions, provide an alternate way of demonstrating that the T = 0 interaction is strongly attractive. Anomalies in delta-V(nn) and delta-V(pp) are shown to correlate with changes in core structure, and repulsive spikes for N = Z nuclei are interpreted in terms of shell-model calculations with realistic interactions. C1 INST ATOM PHYS,BUCHAREST,ROMANIA. RP ZAMFIR, NV (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 16 TC 8 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP 2879 EP 2882 DI 10.1103/PhysRevC.43.2879 PG 4 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800053 ER PT J AU GIBSON, BF PEARCE, BC PAYNE, GL AF GIBSON, BF PEARCE, BC PAYNE, GL TI COMMENT ON TRITON MODEL CALCULATION TEST OF THE BONN W-MATRIX RANK-ONE APPROXIMATION - REPLY SO PHYSICAL REVIEW C LA English DT Editorial Material C1 UNIV IOWA HOSP & CLIN,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. RP GIBSON, BF (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 6 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 JUN PY 1991 VL 43 IS 6 BP 2897 EP 2897 DI 10.1103/PhysRevC.43.2897 PG 1 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800058 ER PT J AU WANG, TF KUHNERT, A BECKER, JA HENRY, EA YATES, SW BRINKMAN, MJ CIZEWSKI, JA AZAIEZ, FA DELEPLANQUE, MA DIAMOND, RM DRAPER, JE KELLY, WH KORTEN, W MACCHIAVELLI, AO RUBEL, E STEPHENS, FS AF WANG, TF KUHNERT, A BECKER, JA HENRY, EA YATES, SW BRINKMAN, MJ CIZEWSKI, JA AZAIEZ, FA DELEPLANQUE, MA DIAMOND, RM DRAPER, JE KELLY, WH KORTEN, W MACCHIAVELLI, AO RUBEL, E STEPHENS, FS TI SUPERDEFORMATION IN PB-198, PB-196 SO PHYSICAL REVIEW C LA English DT Note ID SHAPE ISOMERISM; PB ISOTOPES; NUCLEI; SPIN; EXCITATIONS; ALIGNMENT AB A weakly populated rotational band with energy spacings characteristic of superdeformation has been found in the reaction Sm-154(48Ca,xn) at E(48Ca) = 205 MeV. This band has seven transitions with an average gamma-ray energy spacing of approximately 42 keV. It is assigned to 198Pb on the basis of the excitation-function results. We also confirm the isotopic assignment of a previously reported superdeformed (SD) band in 196Pb via the cross bombardments 176Yb(Mg-26,xn) and 176Yb(Mg-24,xn). Three SD bands have now been identified in the Pb isotopes with neutron numbers 112, 114, and 116. C1 CEN BORDEAU GRADIGNAN,INST NATL PHYS NUCL & PHYS PARTICULES,F-33170 GRADIGNAN,FRANCE. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. UNIV KENTUCKY,LEXINGTON,KY 40506. UNIV CALIF DAVIS,DAVIS,CA 95616. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP WANG, TF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI KORTEN, Wolfram/H-3043-2013 NR 17 TC 30 Z9 30 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUN PY 1991 VL 43 IS 6 BP R2465 EP R2469 PG 5 WC Physics, Nuclear SC Physics GA FT208 UT WOS:A1991FT20800001 ER PT J AU FLYNN, JM HERNANDEZ, OF HILL, BR AF FLYNN, JM HERNANDEZ, OF HILL, BR TI RENORMALIZATION OF 4-FERMION OPERATORS DETERMINING B-BBAR MIXING ON THE LATTICE SO PHYSICAL REVIEW D LA English DT Article ID EFFECTIVE FIELD-THEORY; HEAVY QUARKS; WEAK DECAYS; CONTINUUM; QCD; LIGHT; MESONS; APPROXIMATION; CONNECTION; PARAMETER AB The B-BBAR mixing parameter can be determined from lattice gauge theory by treating the heavy quarks using the static effective field theory. We determine to order alpha-s the linear combination of discretized four-fermion operators whose matrix element determines this parameter. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. RP FLYNN, JM (reprint author), UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106, USA. OI Flynn, Jonathan/0000-0002-6280-1677 NR 34 TC 39 Z9 39 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1991 VL 43 IS 11 BP 3709 EP 3714 DI 10.1103/PhysRevD.43.3709 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN761 UT WOS:A1991FN76100015 ER PT J AU DANIEL, D GUPTA, R RICHARDS, DG AF DANIEL, D GUPTA, R RICHARDS, DG TI CALCULATION OF THE PIONS QUARK DISTRIBUTION AMPLITUDE IN LATTICE QCD WITH DYNAMIC FERMIONS SO PHYSICAL REVIEW D LA English DT Article ID EXCLUSIVE PROCESSES; QUANTUM CHROMODYNAMICS; GAUGE-THEORY; MONTE-CARLO AB We present a calculation of the pion decay constant and of the second moment of the quark distribution amplitude of the pion within full lattice QCD. Measurements are made on 12(3) x 24 and 16(3) x 32 lattices, using two flavors of Wilson fermion. Different methods used to extract f-pi give consistent results. We find a better signal for the second moment of the distribution amplitude than in previous lattice calculations and obtain results that are significantly smaller than those obtained from sum-rule calculations and previously in (quenched) lattice QCD. C1 UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH8 9JZ,MIDLOTHIAN,SCOTLAND. RP DANIEL, D (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,T-8 MS-B285,LOS ALAMOS,NM 87545, USA. NR 17 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 JUN 1 PY 1991 VL 43 IS 11 BP 3715 EP 3724 DI 10.1103/PhysRevD.43.3715 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN761 UT WOS:A1991FN76100016 ER PT J AU ALBRIGHT, CH AF ALBRIGHT, CH TI NEUTRINO MASSES AND MIXINGS BASED ON A SPECIAL SET OF QUARK MASS MATRICES SO PHYSICAL REVIEW D LA English DT Note ID TOP-QUARK; INVARIANT FUNCTIONS; OSCILLATIONS; MATTER; SPECTROSCOPY; ENHANCEMENT; BOUNDS; MODEL; SAW AB A special set of quark mass matrices favored by the hadronic flavor-changing data and yielding a top-quark mass near 135 GeV is used as input for the leptonic Dirac mass submatrices. A lower bound of sin2(2)theta-12 = 0.0193 emerges, which implies a signal less than 25-40 solar-neutrino units in the nonadiabatic Mikheyev-Smirnov-Wolfenstein (MSW) region for the solar-neutrino gallium experiments. By varying the Dirac and heavy diagonal Majorana mass input, we obtain allowed regions in the sigma-m23(2) vs sin2(2)theta-23 planes for fixed points in the nonadiabatic MSW region. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP ALBRIGHT, CH (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. OI Albright, Carl/0000-0002-2252-6359 NR 35 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 JUN 1 PY 1991 VL 43 IS 11 BP R3595 EP R3598 DI 10.1103/PhysRevD.43.R3595 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN761 UT WOS:A1991FN76100002 ER PT J AU RODEAN, HC AF RODEAN, HC TI THE UNIVERSAL CONSTANT FOR THE LAGRANGIAN STRUCTURE-FUNCTION SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Letter ID RANDOM-WALK MODELS; TURBULENT FLOWS; INHOMOGENEOUS TURBULENCE; PARTICLE TRAJECTORIES; VELOCITY VARIANCE; BOUNDARY-LAYER; DISPERSION; SIMULATION; DIFFUSION; GRADIENT AB The Langevin equation has been used for many years to model the dispersion of passive scalars in turbulent flow. It is a stochastic differential equation for the incremental change of Lagrangian particle velocity as a function of the sum of a deterministic term and a stochastic term. The stochastic term is the product of a coefficient and an incremental Wiener process. The coefficient can be written as (C0-epsilon)1/2, where C0 is a universal constant associated with the Lagrangian structure function and epsilon-is the mean rate of turbulent kinetic energy dissipation. There is considerable uncertainty about the value of C0. The values obtained by different investigators are reviewed. A value of C0 = 5.7 is calculated for the constant-stress region in the neutral boundary layer. RP RODEAN, HC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV ATMOSPHER & GEOPHYS SCI,LIVERMORE,CA 94550, USA. NR 23 TC 23 Z9 23 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD JUN PY 1991 VL 3 IS 6 BP 1479 EP 1480 DI 10.1063/1.857984 PG 2 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA FN767 UT WOS:A1991FN76700003 ER PT J AU TURNER, L AF TURNER, L TI BRILLOUIN LIMIT FOR NONNEUTRAL PLASMA IN INHOMOGENEOUS MAGNETIC-FIELDS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ELECTRON AB The effect of magnetic field inhomogeneity upon the maximum density of non-neutral plasma that can be confined in hydrostatic equilibrium under the combined influence of electrostatic and magnetostatic fields is explored in two cases of azimuthally symmetric geometries: first, a plasma in an arbitrary vacuum poloidal magnetic field, B = B(r) (r,z)r-triple-overdot + B(z) (r,z)z-triple-overdot, and second, a toroidal plasma in a toroidal vacuum magnetic field. For the poloidal field case, it is demonstrated that the Brillouin limit on number density can be achieved only with a homogeneous axial magnetic field. For the toroidal field case, it is demonstrated that although the Brillouin limit does not provide a limitation on the local number density confined, it nevertheless does provide an upper limit on the total amount of non-neutral plasma confined in equilibrium. It is also demonstrated that when viscosity is present in the toroidal field case, its effect to first order in the inverse aspect ratio can be opposed by a readjustment of only the external electrostatic potential. RP TURNER, L (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 17 Z9 17 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1355 EP 1363 DI 10.1063/1.859700 PG 9 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500006 ER PT J AU CARRERAS, BA LYNCH, VE GARCIA, L AF CARRERAS, BA LYNCH, VE GARCIA, L TI ELECTRON DIAMAGNETIC EFFECTS ON THE RESISTIVE PRESSURE-GRADIENT-DRIVEN TURBULENCE AND POLOIDAL FLOW GENERATION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB The nonlinear evolution of resistive pressure-gradient-driven turbulence with diamagnetic effects included generates a dc electric field (poloidal velocity) through the convective nonlinearity in the momentum balance equation. This radial electric field has a strong shear and contributes to the saturation of the turbulence; its effect on the saturation level of turbulence is more important than the change of the time and length scales of the modes by the direct omega* effects. C1 UNIV COMPLUTENSE MADRID,MADRID 3,SPAIN. ASSOC CIEMAT EURATOM,MADRID,SPAIN. RP CARRERAS, BA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Lynch, Vickie/J-4647-2012; Garcia, Luis/A-5344-2015 OI Lynch, Vickie/0000-0002-5836-7636; Garcia, Luis/0000-0002-0492-7466 NR 11 TC 91 Z9 91 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1438 EP 1444 DI 10.1063/1.859709 PG 7 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500015 ER PT J AU HAHM, TS AF HAHM, TS TI NONLINEAR-THEORY OF TRAPPED-ELECTRON TEMPERATURE-GRADIENT-DRIVEN TURBULENCE IN FLAT DENSITY H-MODE PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID DRIFT; WAVES AB Ion-temperature-gradient turbulence-based transport models have difficulties reconciling the recent DIII-D H-mode results [Proceedings of 17th European Conference on Controlled Fusion and Plasma Heating (EPS, Geneva, 1990), Vol. 1, p. 271], where the density profile is flat, but X(e) > X(i) in the core region. In this work, a nonlinear theory is developed for recently discovered ion-temperature-gradient trapped-electron modes propagating in the electron diamagnetic direction. This instability is predicted to be linearly unstable for L(Ti)/R less-than-or-similar-to k-theta-rho-s less-than-or-similar-to (L(Ti)/R)1/4. They are also found to be strongly dispersive even at these long wavelengths, thereby suggesting the importance of the wave-particle-wave interactions in the nonlinear saturation phase. The fluctuation spectrum and anomalous fluxes are calculated. In accordance with the trends observed in DIII-D, the predicted electron thermal diffusivity can be larger than the ion thermal diffusivity. RP HAHM, TS (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 17 TC 8 Z9 8 U1 2 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 JUN PY 1991 VL 3 IS 6 BP 1445 EP 1451 DI 10.1063/1.859710 PG 7 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500016 ER PT J AU ONO, Y YAMADA, M JANOS, AC LEVINTON, FM AF ONO, Y YAMADA, M JANOS, AC LEVINTON, FM TI EXPERIMENTAL-STUDY OF THE RELAXATION CYCLE OF A DECAYING SPHEROMAK IN AN EXTERNAL MAGNETIC-FIELD SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MINIMUM-ENERGY STATE; S-1 SPHEROMAK; PLASMA CONFIGURATION; PINCH; GENERATION; EVOLUTION AB For high electron temperature plasma discharges in the S-1 spheromak device [Plasma Physics and Controlled Nuclear Fusion Research, 1984 (IAEA, Vienna, 1985), Vol. 2, p. 535], "sawtooth"- like oscillations appear on signals of magnetic field, flux, q value, and electron temperature. Based on the internal magnetic field profiles measured by magnetic probe scans, the mechanisms and causes of these oscillations are revealed. The cycle of one oscillation consists of a toroidal current peaking phase and a subsequent relaxation phase. In the peaking phase, resistive current decay at the edge causes the spheromak to deviate from the initial minimum-energy Taylor state. The deviation was revealed experimentally by the preferential decay of toroidal flux over poloidal flux. A simple calculation shows that a peaking of the electron temperature profile is the most probable cause for the preferential decay of toroidal flux over poloidal flux. During the peaking phase, q decreases so low as to make the configuration unstable to low-n magnetohydrodynamic (MHD) modes (mainly n = 2 mode). In the relaxation phase, these modes invoke current redistribution (relaxation), restoring the Taylor state. A significant finding in the relaxation phase is that a reversed toroidal field similar to that of the reversed-field pinch (RFP) configuration is sometimes measured at the edge of the plasma for a brief period. The disappearance or resistive decay of the reversed toroidal flux is attributed to a flux conversion through the magnetic reconnections caused by the low-n modes. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RI Yamada, Masaaki/D-7824-2015 OI Yamada, Masaaki/0000-0003-4996-1649 NR 27 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1452 EP 1460 DI 10.1063/1.859711 PG 9 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500017 ER PT J AU SCHOENBERG, KF MOSES, RW AF SCHOENBERG, KF MOSES, RW TI MAGNETIC TURBULENT ELECTRON-TRANSPORT IN THE REVERSED-FIELD PINCH SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ZERO-DIMENSIONAL SIMULATIONS; ANOMALOUS TRANSPORT; CONFINEMENT PHYSICS; PLASMA; FLUCTUATIONS; TOKAMAKS; ZT-40M; EDGE AB A model of magnetic turbulent electron transport is presented. The model, based on test particle diffusion in a stochastic magnetic field, entails a Boltzmann description of electron dynamics in the long mean-free-path limit and quantitatively describes the salient features of superthermal electron measurements in the reversed-field pinch (RFP) edge plasma. Included are predictions of the mean superthermal electron energy, current density, and distribution function asymmetry. The distribution function asymmetry leads directly to the observed power flow asymmetry in present generation RFP's. A discussion of the transport model, the assumptions implicit in the model, a comparison of model predictions with experiment, and the relevance of this work to the general issue of magnetic turbulent transport in toroidal systems are presented. RP SCHOENBERG, KF (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 37 TC 15 Z9 15 U1 1 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 JUN PY 1991 VL 3 IS 6 BP 1467 EP 1472 DI 10.1063/1.859713 PG 6 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500019 ER PT J AU DARROW, CB DRAKE, RP MONTGOMERY, DS YOUNG, PE ESTABROOK, K KRUER, WL JOHNSTON, TW AF DARROW, CB DRAKE, RP MONTGOMERY, DS YOUNG, PE ESTABROOK, K KRUER, WL JOHNSTON, TW TI EXPERIMENTAL STUDIES OF STIMULATED RAMAN-SCATTERING IN REACTOR-SIZE, LASER-PRODUCED PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID UNDERDENSE PLASMA; MU-M; BRILLOUIN-SCATTERING; ABSOLUTE INSTABILITY; ELECTRON PRODUCTION; TARGETS; LIGHT; BACKSCATTER; SPECTRA; PLANAR AB In this paper the results of experiments designed to provide information regarding the scaling of the stimulated Raman scattering (SRS) instability in long-scale-length, inertial-confinement-fusion-reactor-size plasmas are described. Reactor-scale plasma conditions were experimentally simulated by exploding thin CH foils with nine beams of the Nova laser [Rev. Sci. Instrum. 57, 2101 (1986)]. Using a one-dimensional hydro model, the target and irradiation parameters were chosen to produce the largest-possible scale length plasma consistent with the energy and pulse width capabilities of Nova. The SRS emissions, driven by both the nine plasma-production beams and a tightly focused and delayed tenth beam, were recorded using an angularly resolved photodiode array and a temporally resolved optical spectrometer. These measurements verified the production of a reactor-size plasma (L/lambda almost-equal-to 5000) and indicated that the absolute levels of SRS backscatter detected in the present experiments have not increased relative to those measured in previous experiments despite a calculated sevenfold increase in the plasma density-gradient scale length. Inverse bremsstrahlung absorption of the scattered light is believed to be the dominant mechanism for this apparent saturation and, in this parameter regime, may enhance the effective thermal coupling between the incident laser and plasma densities below 0.15n(crit) where absorption of the incident laser light is typically weak. C1 INST NATL RECH SCI ENERGIE VARENNES,VARENNES JOL 2PO,QUEBEC,CANADA. RP DARROW, CB (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; Montgomery, David/0000-0002-2355-6242 NR 32 TC 14 Z9 14 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1473 EP 1478 DI 10.1063/1.859714 PG 6 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500020 ER PT J AU KANIA, DR KRUER, WL BELL, P OBENSCHAIN, SP KEARNEY, K MOSTOVYCH, A AF KANIA, DR KRUER, WL BELL, P OBENSCHAIN, SP KEARNEY, K MOSTOVYCH, A TI INCREASED X-RAY CONVERSION EFFICIENCY FROM GOLD PLASMAS IRRADIATED WITH SPATIALLY AND TEMPORALLY INCOHERENT-LIGHT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RAMAN-SCATTERING; MU-M; LASER; EMISSION; ILLUMINATION; RADIATION; TARGETS AB The efficiency with which 1.05-mu-m laser light is converted into x rays with energy less than 1.5 keV in high Z materials (gold) is increased by approximately 20% with the use of spatially and temporally incoherent light when compared to a nominal, high-powered laser beam with an identical average irradiance of 10(14) W/cm2. This effect is not a result of increased laser light absorption, laser bandwidth, nor reduced hot electron generation for the incoherent light, but is probably due to the change in the short scale length (approximately 100-mu-m) laser light intensity distribution in the target plane. The absolute levels of stimulated scattering and hot electron generation were small in all cases. Incoherent illumination reduced stimulated Brillouin scattering levels from 1.1% to 0.2% and, similarly, hot electron generation was decreased from 0.1% to 0.07%. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KANIA, DR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L473,POB 5508,LIVERMORE,CA 94550, USA. NR 19 TC 2 Z9 2 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1496 EP 1500 DI 10.1063/1.859717 PG 5 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500023 ER PT J AU WONG, KL AF WONG, KL TI AN ALPHA-PARTICLE DIAGNOSTIC BASED ON MEASUREMENTS OF LOWER-HYBRID WAVE FLUCTUATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note ID ION AB It is shown that the one-dimensional alpha particle velocity distribution function can be determined from a first-order differential equation based on measurements of lower-hybrid wave fluctuations in an equilibrium plasma. This method uses collective Thomson scattering data from an array of detectors placed on a prescribed curve. It is applicable only when the alpha particles have an isotropic velocity distribution. RP WONG, KL (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1501 EP 1503 DI 10.1063/1.859718 PG 3 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500024 ER PT J AU WILLIAMS, EA AF WILLIAMS, EA TI CONVECTIVE GROWTH OF PARAMETRICALLY UNSTABLE MODES IN INHOMOGENEOUS-MEDIA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note AB By a suitable definition of an amplification coefficient, a convenient analytic criterion for convective instability of damped parametrically coupled unstable modes in an inhomogeneous medium is obtained. The net growth factor F3 on propagation through the resonant interaction region is found to be given by F3 = exp[(pi-gamma-0(2)/kappa'upsilon-1-upsilon-2)F(square-root nu-1-nu-2/gamma-0)], where the reduction factor F(x) = (2/pi)[acos(x) - x square-root 1 - x2]. This can readily be seen to reduce to the usual inhomogeneous gain formula when damping is negligible and F = 1, and to manifest the homogeneous convective threshold, gamma-0(2) > nu-1-nu-2. This result should find useful application in laser fusion plasmas, where damping and spatial inhomogeneity are frequently suppression mechanisms of comparable importance for laser-driven parametric instabilities. RP WILLIAMS, EA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L472,BOX 5508,LIVERMORE,CA 94550, USA. NR 5 TC 16 Z9 16 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1504 EP 1506 DI 10.1063/1.859719 PG 3 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500025 ER PT J AU ESTABROOK, K KRUER, WL AF ESTABROOK, K KRUER, WL TI PARAMETRIC-INSTABILITIES NEAR THE CRITICAL DENSITY ON STEEPENED DENSITY PROFILES - REPLY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter AB In a recent Comment, theoretical estimates of the density scale length in a laser-produced plasma were compared with some experimental observations. It is noted that many assumptions of the ideal model are not satisfied for the experiments with 5 nsec pulses of 1.06-mu-m light. It is also noted that the model predicts a local profile modification near the critical density which can be difficult to resolve in some experiments. RP ESTABROOK, K (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1512 EP 1512 DI 10.1063/1.859722 PG 1 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500028 ER PT J AU ROSENSTEIN, B WARR, BJ PARK, SH AF ROSENSTEIN, B WARR, BJ PARK, SH TI DYNAMIC SYMMETRY-BREAKING IN 4-FERMION INTERACTION MODELS SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID GROSS-NEVEU MODEL; SU(N) THIRRING MODEL; EXACT S-MATRIX; ANTIFERROMAGNETIC HEISENBERG-MODEL; SEMICLASSICAL BOUND-STATES; ULTRAVIOLET FIXED-POINT; NONLINEAR SIGMA-MODEL; QUANTUM-FIELD-THEORY; ONE-COMPONENT MODEL; CHIRAL-SYMMETRY AB Dynamical symmetry breaking in 4-fermion models in 2 + 1 dimensions is quantitatively studied. We use the 1/N expansion and show that these models are renormalizable in this framework, in spite of their non-renormalizability in weak coupling expansion. The particular topics discussed include interactions of composite Goldstone bosons with other particles and among themselves, low-energy theorems, chiral lagrangians, the effects of explicit symmetry breaking, and the thermodynamics of the dynamical symmetry restoring phase transition. C1 INT CTR THEORET PHYS, I-34100 TRIESTE, ITALY. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. RP UNIV BRITISH COLUMBIA, VANCOUVER V6T 2A6, BC, CANADA. NR 192 TC 233 Z9 236 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 EI 1873-6270 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUN PY 1991 VL 205 IS 2 BP 59 EP 108 DI 10.1016/0370-1573(91)90129-A PG 50 WC Physics, Multidisciplinary SC Physics GA FU340 UT WOS:A1991FU34000001 ER PT J AU ROY, R SUMPTER, BG PFEFFER, GA GRAY, SK NOID, DW AF ROY, R SUMPTER, BG PFEFFER, GA GRAY, SK NOID, DW TI NOVEL METHODS FOR SPECTRAL-ANALYSIS SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID MOLECULAR-DYNAMICS SIMULATIONS; SEMICLASSICAL CALCULATION; ENERGY REDISTRIBUTION; RAMAN-SPECTROSCOPY; WAVE PACKET; MULTIDIMENSIONAL SYSTEMS; VANDERWAALS MOLECULES; STRESSED POLYETHYLENE; UNIMOLECULAR REACTION; SCHRODINGER-EQUATION AB In this review article, various techniques for obtaining estimates of parameters related to the spectrum of an underlying process are discussed. These techniques include the conventional nonparametric FFT approach and more recently developed parametric techniques such as maximum entropy, MUSIC, and ESPRIT, the latter two being classified as signal-subspace or eigenvector techniques. These estimators span the spectrum (of possible estimators in that extremes of a priori knowledge are assumed (nonparametric versus parametric) and extremes in the underlying model of the observed process (deterministic versus stochastic) are involved. The advantage of parametric techniques is their ability to provide very accurate estimates using data from extremely short time intervals. Several applications of these novel methods for frequency analysis of very short time data are presented. These include calculation of dispersion curves, and the density of vibrational states g(omega) for many-body systems, semiclassical transition frequencies, overtone linewidths. and resonance energies of the time-dependent Schrodinger equation for few-body problems. C1 SYST RES ASSOC INC,STANFORD,CA. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. UNIV NEBRASKA,DEPT CHEM,OMAHA,NE 68182. RP ROY, R (reprint author), STANFORD UNIV,DEPT ELECT ENGN,STANFORD,CA 94305, USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 129 TC 54 Z9 54 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUN PY 1991 VL 205 IS 3 BP 109 EP 152 DI 10.1016/0370-1573(91)90044-M PG 44 WC Physics, Multidisciplinary SC Physics GA FT939 UT WOS:A1991FT93900001 ER PT J AU MILONNI, PW AF MILONNI, PW TI VACUUMS, RETARDATION AND CASIMIR INTERACTIONS SO PHYSICS TODAY LA English DT Letter RP MILONNI, PW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 3 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1991 VL 44 IS 6 BP 13 EP 13 DI 10.1063/1.2810131 PG 1 WC Physics, Multidisciplinary SC Physics GA FV089 UT WOS:A1991FV08900002 ER PT J AU JORGENSEN, JD AF JORGENSEN, JD TI DEFECTS AND SUPERCONDUCTIVITY IN THE COPPER OXIDES SO PHYSICS TODAY LA English DT Article ID PHASE-SEPARATION; OXYGEN-DEFECT; TEMPERATURE; YBA2CU3O7-DELTA; 60-K; SITE RP JORGENSEN, JD (reprint author), ARGONNE NATL LAB,XRAY CATTERING GRP,ARGONNE,IL 60439, USA. NR 32 TC 123 Z9 126 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1991 VL 44 IS 6 BP 34 EP 40 DI 10.1063/1.881304 PG 7 WC Physics, Multidisciplinary SC Physics GA FV089 UT WOS:A1991FV08900009 ER PT J AU SCHWEINLER, H ERMAN, B MARK, JE WEINBERG, A AF SCHWEINLER, H ERMAN, B MARK, JE WEINBERG, A TI GUTH,EUGENE - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual C1 BOGAZICI UNIV,ISTANBUL,TURKEY. UNIV CINCINNATI,CINCINNATI,OH 45221. OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830. RP SCHWEINLER, H (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1991 VL 44 IS 6 BP 133 EP 134 DI 10.1063/1.2810157 PG 2 WC Physics, Multidisciplinary SC Physics GA FV089 UT WOS:A1991FV08900021 ER PT J AU UCKAN, T MIODUSZEWSKI, PK BIGELOW, T GLOWIENKA, JC HIROE, S MURAKAMI, M WILGLEN, JB WING, WR AF UCKAN, T MIODUSZEWSKI, PK BIGELOW, T GLOWIENKA, JC HIROE, S MURAKAMI, M WILGLEN, JB WING, WR TI POWER AND PARTICLE BALANCE STUDIES USING AN INSTRUMENTED LIMITER SYSTEM ON ATF SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article AB Power and particle balance studies on the Advanced Toroidal Facility (ATF) torsatron are carried out using a rail limiter system. Both top and bottom limiters are made of graphite tile arrays, and these tiles are instrumented with thermocouples and Langmuir probes for calorimetric and particle flux measurements. Initial experimental results indicate that the limiter power loss accounts for about 12% of the total and the radiation loss for about 30% of the total; the rest of the plasma heating power appears to be going to the vessel wall. The particle flux to the limiters is also about 18%. The fractions of power and particle flux to the limiters are relatively lower than in Tokamaks because of the low edge safety factor, q approximately 1 rather than q approximately 3 as in a typical Tokamak, at the natural boundary of the ATF plasma (which results from the magnetic stellarator configuration of this currentless device). Therefore, for limiters of the same size, these fractions are about a factor of q lower in ATF than in a comparable Tokamak device. RP UCKAN, T (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831, USA. NR 11 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JUN PY 1991 VL 33 IS 6 BP 703 EP 712 DI 10.1088/0741-3335/33/6/010 PG 10 WC Physics, Fluids & Plasmas SC Physics GA FT132 UT WOS:A1991FT13200010 ER PT J AU SHARP, DJ AF SHARP, DJ TI NEW CAPABILITIES AND APPLICATIONS FOR ELECTROPHORETICALLY DEPOSITED COATINGS SO PLATING AND SURFACE FINISHING LA English DT Article AB Electrophoresis is employed for numerous practical applications, ranging from lipid and protein identification in biochemistry and medicine, to coatings for appliances, automobile primer coats, and enamel and glass finishes. A few applications of various electrophoretic systems have been recently investigated at Sandia National Laboratories. During these studies, it was observed that virtually all finely divided dispersions of various materials may be coated on conductive substrates, using electrophoresis. RP SHARP, DJ (reprint author), SANDIA NATL LABS,DIV INTERFACIAL CHEM & COATING RES,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 5 TC 1 Z9 1 U1 1 U2 1 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD JUN PY 1991 VL 78 IS 6 BP 38 EP & PG 0 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA FQ039 UT WOS:A1991FQ03900012 ER PT J AU HAYASHI, F YAMAZAKI, A AF HAYASHI, F YAMAZAKI, A TI POLYMORPHISM IN PURIFIED GUANYLATE-CYCLASE FROM VERTEBRATE ROD PHOTORECEPTORS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE GLYCOPROTEIN; RETINA; AFFINITY CHROMATOGRAPHY ID NATRIURETIC FACTOR RECEPTOR; CYCLIC-GMP SYNTHESIS; GTP-BINDING PROTEIN; OUTER SEGMENTS; LIGHT ADAPTATION; RAT LUNG; PURIFICATION; CALCIUM; PHOSPHODIESTERASE; CHROMATOGRAPHY AB Guanylate cyclase from rod photoreceptors of amphibian (toad, Bufo marinus, and frog, Rana catesbiana) and bovine retinas was solubilized and purified by a single chromatography step on a GTP-agarose column. Silver staining of purified amphibian enzymes in SDS/polyacrylamide gels disclosed a doublet band (110 and 115 kDa), while the bovine enzyme appeared as a singlet band (110 kDa). The identification of these guanylate cyclases was confirmed using three chromatography systems with the purified enzymes. Specific binding to Con A-Sepharose suggested that rod guanylate cyclase is a glycoprotein. Two-dimensional gel electrophoresis of purified toad, frog, and bovine enzymes resolved two, three, and five variants, respectively, that differed in isoelectric point. Two variants of toad guanylate cyclase showed differences in various characterizations. These data suggest multiple mechanisms for regulation of guanylate cyclase activity in vertebrate rod photoreceptors. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,CELLULAR & MOLEC BIOL GRP,MAIL STOP M888,LOS ALAMOS,NM 87545. FU NEI NIH HHS [EY07546] NR 23 TC 77 Z9 78 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 JUN PY 1991 VL 88 IS 11 BP 4746 EP 4750 DI 10.1073/pnas.88.11.4746 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FP087 UT WOS:A1991FP08700039 PM 1675787 ER PT J AU WOLK, CP CAI, YP PANOFF, JM AF WOLK, CP CAI, YP PANOFF, JM TI USE OF A TRANSPOSON WITH LUCIFERASE AS A REPORTER TO IDENTIFY ENVIRONMENTALLY RESPONSIVE GENES IN A CYANOBACTERIUM SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE ANABAENA; HETEROCYST; PATTERN; TEMPERATURE; TN5 ID SP-STRAIN PCC-7120; ESCHERICHIA-COLI; NITROGENASE ACTIVITY; NUCLEOTIDE-SEQUENCE; MYXOCOCCUS-XANTHUS; PLASMID VECTOR; ANABAENA; EXPRESSION; CONSTRUCTION; DNA AB Anabaena, a filamentous cyanobacterium, is of developmental interest because, when deprived of fixed nitrogen, it shows patterned differentiation of N2-fixing cells called heterocysts. To help elucidate its early responses to a decrease in nitrogen, we used a derivative of transposon Tn5 to generate transcriptional fusions of promoterless bacterial luciferase genes, luxAB, to the Anabaena genome. Genes that responded to removal of fixed nitrogen or to other environmental shifts by increased or decreased transcription were identified by monitoring the luminescence of colonies from transposon-generated libraries. The Tn5 derivative transposed in Anabaena at ca. 1-4 X 10(-5) per cell and permitted high-resolution mapping of its position and orientation in the genome and facile cloning of contiguous genomic DNA. C1 MICHIGAN STATE UNIV,CTR MICROBIAL ECOL,E LANSING,MI 48824. RP WOLK, CP (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. NR 56 TC 183 Z9 194 U1 2 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 JUN PY 1991 VL 88 IS 12 BP 5355 EP 5359 DI 10.1073/pnas.88.12.5355 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FR448 UT WOS:A1991FR44800060 PM 11607193 ER PT J AU LOEHLE, C AF LOEHLE, C TI FRACTAL-D - VERSION-1.00 SO QUARTERLY REVIEW OF BIOLOGY LA English DT Software Review RP LOEHLE, C (reprint author), SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0033-5770 J9 Q REV BIOL JI Q. Rev. Biol. PD JUN PY 1991 VL 66 IS 2 BP 243 EP 244 DI 10.1086/417236 PG 2 WC Biology SC Life Sciences & Biomedicine - Other Topics GA FT060 UT WOS:A1991FT06000010 ER PT J AU NAGASAWA, H LITTLE, JB INKRET, WC CARPENTER, S RAJU, MR CHEN, DJ STRNISTE, GF AF NAGASAWA, H LITTLE, JB INKRET, WC CARPENTER, S RAJU, MR CHEN, DJ STRNISTE, GF TI RESPONSE OF X-RAY-SENSITIVE CHO MUTANT-CELLS (XRS-6C) TO RADIATION .2. RELATIONSHIP BETWEEN CELL-SURVIVAL AND THE INDUCTION OF CHROMOSOMAL DAMAGE WITH LOW-DOSES OF ALPHA-PARTICLES SO RADIATION RESEARCH LA English DT Article ID SISTER-CHROMATID EXCHANGES; DENSITY-INHIBITED CULTURES; MOUSE 10T1/2 CELLS; HAMSTER OVARY CELLS; MALIGNANT TRANSFORMATION; CYTOLOGICAL CHARACTERIZATION; ATAXIA-TELANGIECTASIA; HUMAN-LYMPHOCYTES; MAMMALIAN-CELLS; UV-IRRADIATION C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV HLTH SAFETY & ENVIRONM,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP NAGASAWA, H (reprint author), HARVARD UNIV,SCH PUBL HLTH,RADIOBIOL LAB,BOSTON,MA 02115, USA. FU NCI NIH HHS [CA47542] NR 54 TC 48 Z9 49 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1991 VL 126 IS 3 BP 280 EP 288 DI 10.2307/3577917 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA FN911 UT WOS:A1991FN91100002 PM 2034785 ER PT J AU DALE, VH AF DALE, VH TI REVEGETATION OF MOUNT ST-HELENS DEBRIS AVALANCHE 10 YEARS POST ERUPTION SO RESEARCH & EXPLORATION LA English DT Article ID GROWTH AB Vegetation establishment on the debris avalanche created by the 1980 eruption of Mount St. Helens averaged 18% by September 1989. The current species composition and life-form spectrum resemble that which occurred in the vicinity of Mount St. Helens before the eruption. Both deciduous and coniferous trees present before the eruption were established on the debris avalanche by 1981 and their size and density have been increasing since then. By 1989 willows were the most important trees on the debris; average cover was almost 3%, but willows are expected to remain restricted to wet sites. Red alder is likely to become more important in the successional process during the next decades. Herbaceous species and grasses, which were aerially seeded in an attempt to establish vegetation and reduce erosion, actually seem to inhibit recovery. The coniferous forest typical of the Pacific Northwest cannot achieve dominance for many decades. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI Dale, Virginia/B-6023-2009 NR 19 TC 17 Z9 17 U1 1 U2 6 PU NATL GEOGRAPHIC SOC PI WASHINGTON PA 17TH AND M STS NW, WASHINGTON, DC 20036 SN 8755-724X J9 RES EXPLOR JI Res. Explor. PD SUM PY 1991 VL 7 IS 3 BP 328 EP 341 PG 14 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LE779 UT WOS:A1991LE77900007 ER PT J AU MANNING, JF CHIESA, SC AF MANNING, JF CHIESA, SC TI FERMENTATION INDUSTRY SO RESEARCH JOURNAL OF THE WATER POLLUTION CONTROL FEDERATION LA English DT Review ID WASTE-WATER; ACTIVATED-SLUDGE; ANAEROBIC-DIGESTION; DRIED GRAINS; UASB PROCESS; DISTILLERY; WASTEWATERS; EXPERIENCES; OPERATION; FACTORIES C1 SANTA CLARA UNIV,DEPT CIVIL ENGN,SANTA CLARA,CA. RP MANNING, JF (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ER-203,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 30 TC 0 Z9 0 U1 1 U2 2 PU WATER ENVIRONMENT FEDERATION PI ALEXANDRIA PA 601 WYTHE ST, ALEXANDRIA, VA 22314-1994 SN 1047-7624 J9 RES J WATER POLLUT C PD JUN PY 1991 VL 63 IS 4 BP 448 EP 450 PG 3 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA FR368 UT WOS:A1991FR36800023 ER PT J AU YE, MY SCHULER, RH AF YE, MY SCHULER, RH TI AN APPLICATION OF HPLC AND ION CHROMATOGRAPHY TO STUDY INTRAMOLECULAR CHARGE-TRANSFER IN POLYHALOGENATED SYSTEMS SO RESEARCH ON CHEMICAL INTERMEDIATES LA English DT Article ID AQUEOUS-SOLUTION; RADICALS AB Reaction of hydrated electrons with aromatics substituted with both bromine and chlorine results in the production of significant yields of chloride ion and the complementary bromine substituted phenyl radical. The total yields show that in all cases the reduction is essentially quantitative. For the dihalogenated benzenes and phenols the relative yields for C-Br and C-Cl bond rupture (0.86:0.14) reflect the relative rates for electron attachment at the Br and Cl positions, suggesting that there is little intramolecular charge transfer on the time scale of dissociation of the initial anion. In the case of dihalogenated benzoates about 40% of the reduction results in C-Cl bond rupture. In this case the added charge initially localized on the carboxyl group is transferred preferentially to the chlorine atom indicating that solvation of the intermediate radical anion must play an extremely important role in controlling the overall reduction process. C1 UNIV NOTRE DAME, RADIAT LAB, NOTRE DAME, IN 46556 USA. UNIV NOTRE DAME, DEPT CHEM, NOTRE DAME, IN 46556 USA. RP YE, MY (reprint author), PACIFIC NW LAB, P8-47,POB 999, RICHLAND, WA 99352 USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU VSP BV PI ZEIST PA PO BOX 346, 3700 AH ZEIST, NETHERLANDS SN 0922-6168 J9 RES CHEM INTERMEDIAT JI Res. Chem. Intermed. PD JUN PY 1991 VL 15 IS 3 BP 239 EP 252 DI 10.1163/156856791X00354 PG 14 WC Chemistry, Multidisciplinary SC Chemistry GA GB974 UT WOS:A1991GB97400003 ER PT J AU MUELLER, KT CHINGAS, GC PINES, A AF MUELLER, KT CHINGAS, GC PINES, A TI NMR PROBE FOR DYNAMIC-ANGLE SPINNING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; HIGH-RESOLUTION NMR; SOLID-STATE NMR; QUADRUPOLAR NUCLEI; ROTATING SOLIDS; DOUBLE-ROTOR; O-17 NMR; MAS-NMR; SPECTROSCOPY; MINERALS AB We describe the design of a probe for dynamic-angle spinning (DAS) NMR experiments, comprised of a spinning cylindrical sample holder whose axis may be reoriented rapidly between discrete directions within the bore of a superconducting magnet. This allows the refocusing of nuclear spin magnetization that evolves under anisotropic interactions such as chemical shift anisotropy and quadrupolar coupling, providing high resolution NMR spectra for quadrupolar nuclei in solid materials. The probe includes an axial air delivery system to bearing and drive jets which support and spin a rotor containing the sample. Axis reorientation is accomplished with a pulley attached to the probehead and coupled to a stepping motor outside of the magnet. The choice of motor and gear ratio is based on an analysis of the moments of inertia of the motor and load, the desired angular resolution, and simplicity of design. Control of angular accuracy and precision are discussed, as well as the efficiency of radiofrequency irradiation and detection. High resolution DAS spectra of oxygen-17 and aluminum-27 nuclei in polycrystalline minerals illustrate the experimental capabilities. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. RP MUELLER, KT (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Mueller, Karl/A-3637-2010 NR 35 TC 32 Z9 32 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1445 EP 1452 DI 10.1063/1.1142465 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200011 ER PT J AU NOREM, J AF NOREM, J TI A BEAM PROFILE MONITOR FOR SMALL ELECTRON-BEAMS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Measurement of beam properties at the foci of high energy linacs is difficult due to the small size of the waists in proposed and existing accelerators (1 nm - 2-mu-m). This article considers the use of bremsstrahlung radiation from thin foils to measure the size and phase space density these beams using nonimaging optics. The components of the system are described, and the ultimate resolution, evaluated theoretically for the case of the Final Focus Test Beam (FFTB) at Stanford Linear Accelerator Center, is a few nm. RP NOREM, J (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 12 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1464 EP 1467 DI 10.1063/1.1142468 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200014 ER PT J AU CHRIEN, RE AF CHRIEN, RE TI NEUTRON CALIBRATION FOR THE FRX-C LSM MAGNETIC COMPRESSION EXPERIMENT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID FIELD-REVERSED CONFIGURATION; ACTIVATION SYSTEM; TOKAMAK; TFTR AB Neutron source strength and yield from field-reversed configurations have been measured in the FRX-C/LSM magnetic compression experiment using plastic scintillators, indium activation samples, and moderated rhodium activation counters. The calibration of these neutron detectors is complicated by the changing shape and position of the plasma and by the presence of the massive aluminum compression coils. The overall uncertainty in the neutron measurements is estimated to be 45%. RP CHRIEN, RE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 2 Z9 2 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1489 EP 1493 DI 10.1063/1.1142473 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200019 ER PT J AU KWAN, JW ACKERMAN, GD ANDERSON, OA CHAN, CF COOPER, WS DEVRIES, GJ KUNKEL, WB LEUNG, KN PURGALIS, P STEELE, WF WELLS, RP AF KWAN, JW ACKERMAN, GD ANDERSON, OA CHAN, CF COOPER, WS DEVRIES, GJ KUNKEL, WB LEUNG, KN PURGALIS, P STEELE, WF WELLS, RP TI TESTING OF AN ADVANCED VOLUME H- SOURCE AND PREACCELERATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID MULTICUSP ION-SOURCE; OPTIMIZATION; EXTRACTION; BEAMS AB In testing a cesiated volume-production negative ion source, we have obtained 75 mA of H- beam current in a 270 ms pulse length delivered downstream of the 87 keV preaccelerator. Optimum pressure in the source was less than 8 mT and the electron-to-ion ratio in the beam was less than 4. With future improvements in the electron trap, it is anticipated that higher H- current can be obtained by operating with a higher discharge power and a lower plasma electrode bias. RP KWAN, JW (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1521 EP 1526 DI 10.1063/1.1142480 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200026 ER PT J AU STYGAR, WA MIX, LP LEEPER, RJ AF STYGAR, WA MIX, LP LEEPER, RJ TI OPTIMIZED RUTHERFORD-SCATTERING GEOMETRIES FOR INTENSE ION-BEAM DIAGNOSTICS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INERTIAL CONFINEMENT FUSION; THOMSON SPECTROMETER; ENERGY DEPOSITION; DIODE; TARGETS AB Rutherford scattering is used routinely for diagnostic purposes to reduce the intensity of ion beams in inertial-confinement-fusion experiments. A limitation of the scattering technique is the strong dependence of the Rutherford cross section on the scattering angle [sigma proportional-to 1/sin4(theta-s/2)] because the angular distribution of the beam ions is not precisely known and is difficult to measure. It is shown that this limitation can be overcome with the use of a thin scattering foil, and an analytic expression is derived that defines geometries for which the scattering probability is, to first order, independent of theta-s. RP STYGAR, WA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 29 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1527 EP 1530 DI 10.1063/1.1142481 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200027 ER PT J AU MCNAMEE, MJ WAWERSIK, WR SHIELDS, ME HOLCOMB, DJ AF MCNAMEE, MJ WAWERSIK, WR SHIELDS, ME HOLCOMB, DJ TI A COMPACT COAXIAL ELECTRICAL FEEDTHROUGH FOR USE UP TO 400 MPA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB Acoustic emission (AE) measurements coupled with source locations of AE are an important tool for monitoring the evolution of microcracking during the deformation of pressure-sensitive brittle materials. Successful resolution of acoustic emission signals, however, requires the transmission of low-amplitude (tens of microvolts), high-frequency (1 MHz) electrical signals. To accomplish this under hydrostatic pressure, AE signals must be transmitted along coaxial cables and through coaxial electrical feedthroughs from the inside to the outside of pressure vessels. The need for multiple, isolated feedthroughs in relatively small pressure vessels led to the development of the coaxial electrical feedthroughs as shown. RP MCNAMEE, MJ (reprint author), SANDIA NATL LABS,DIV GEOMECH 6232,ALBUQUERQUE,NM 87185, USA. NR 6 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1662 EP 1663 DI 10.1063/1.1142454 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200054 ER PT J AU COSTANTINO, M AF COSTANTINO, M TI A HIGH PRESSURE-HIGH TEMPERATURE VALVE PACKING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB A rotating valve stem packing for use at temperatures at least to 400-degrees-C and pressures to 300 MPa is described. The design is based on the unsupported area principle, with copper packing washers. RP COSTANTINO, M (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,HIGH PRESSURE HIGH TEMP LAB,LIVERMORE,CA 94550, USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1668 EP 1669 DI 10.1063/1.1142406 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200057 ER PT J AU YOUNGBLOOD, RW AF YOUNGBLOOD, RW TI A REVIEW OF FAULTREASE VERSION 1.0 SO RISK ANALYSIS LA English DT Software Review RP YOUNGBLOOD, RW (reprint author), BROOKHAVEN NATL LAB,DEPT EARTH & SPACE SCI,FACILIT RISK ANAL GRP,UPTON,NY 11973, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 343 EP 348 PG 6 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA FT984 UT WOS:A1991FT98400023 PM 1876730 ER PT J AU WHITE, RK AF WHITE, RK TI BIOLOGIC MARKERS IN PULMONARY TOXICOLOGY - NATL-RES-COUNCIL SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 351 EP 351 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 FT984 UT WOS:A1991FT98400025 ER PT J AU WHITE, RK AF WHITE, RK TI RISK PERSPECTIVES ON ENVIRONMENTAL-IMPACT ASSESSMENT - GRIMA,AP, FOWLE,CD, MUNN,RE SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 351 EP 351 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 FT984 UT WOS:A1991FT98400026 ER PT J AU WHITE, RK AF WHITE, RK TI ENVIRONMENTAL IMPACTS OF HAZARDOUS-WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES - SALCEDO,RN, CROSS,FL, CHRISMON,RL SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 352 EP 352 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 FT984 UT WOS:A1991FT98400027 ER PT J AU WHITE, RK AF WHITE, RK TI ANALYTICAL GROUNDWATER MODELING - FLOW AND CONTAMINANT MIGRATION - WALTON,WC SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 352 EP 352 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 FT984 UT WOS:A1991FT98400028 ER PT J AU WHITE, RK AF WHITE, RK TI PRINCIPLES OF HAZARDOUS MATERIALS MANAGEMENT - GRIFFIN,RD SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 352 EP 353 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 FT984 UT WOS:A1991FT98400030 ER PT J AU WHITE, RK AF WHITE, RK TI BENCHMARKS - ALTERNATIVE METHODS IN TOXICOLOGY - MEHLMAN,MA SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 353 EP 353 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 FT984 UT WOS:A1991FT98400033 ER PT J AU WHITE, RK AF WHITE, RK TI BIOHAZARDS OF DRINKING-WATER TREATMENT - LARSON,RA SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 75009,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 353 EP 353 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 FT984 UT WOS:A1991FT98400031 ER PT J AU WHITE, RK AF WHITE, RK TI HAZARDOUS-WASTE MINIMIZATION HANDBOOK - HIGGINS,TE SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 353 EP 353 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 FT984 UT WOS:A1991FT98400032 ER PT J AU WHITE, RK AF WHITE, RK TI INTERMEDIA POLLUTANT TRANSPORT - MODELING AND FIELD-MEASUREMENTS - ALLEN,DT, COHEN,Y, KAPLAN,IR SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6383 7509,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD JUN PY 1991 VL 11 IS 2 BP 354 EP 354 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 FT984 UT WOS:A1991FT98400034 ER PT J AU JOY, DC AF JOY, DC TI AN INTRODUCTION TO MONTE-CARLO SIMULATIONS SO SCANNING MICROSCOPY LA English DT Article DE MONTE-CARLO SIMULATION; ELECTRON SCATTERING; STOPPING POWER; ELECTRON RANGE; X-RAY GENERATION; ELECTRON-HOLE PAIR GENERATION; BACKSCATTERING; SECONDARY ELECTRON EMISSION ID ELECTRON; MODEL AB The interaction of an electron beam with a solid can be modeled by the so-called Monte Carlo method. This technique produces a stepwise simulation of the electron trajectory by using random numbers to predict scattering angles on the basis of theoretical probability distributions or empirical models. The physical basis of electron scattering in a solid is described and two generic types of Monte Carlo model are then developed together with suggested examples of their application. An IBM PC compatible disc containing these programs is available from the author. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP JOY, DC (reprint author), UNIV TENNESSEE,EM FACIL,F239,WALTERS LIFE SCI BLDG,KNOXVILLE,TN 37996, USA. NR 17 TC 74 Z9 74 U1 1 U2 9 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 JUN PY 1991 VL 5 IS 2 BP 329 EP 337 PG 9 WC Microscopy SC Microscopy GA GC670 UT WOS:A1991GC67000004 ER PT J AU SEED, TM NIIRO, GK AF SEED, TM NIIRO, GK TI ALPHA-PARTICLE IRRADIATION-INDUCED CHANGE IN BRONCHOPULMONARY MACROPHAGE MORPHOLOGY, INVITRO SO SCANNING MICROSCOPY LA English DT Article DE ALPHA-RADIATION; HEAVY PARTICLES; HIGH-LET; MACROPHAGES; BRONCHOPULMONARY MACROPHAGES; ULTRASTRUCTURE; ELECTRON MICROSCOPY ID ALVEOLAR MACROPHAGES; BONE-MARROW; RADIATION; CELLS; SURFACE; DEATH AB Bronchopulmonary macrophages, isolated from canine lungs by saline lavage and grown in tissue culture for short periods, were acutely irradiated with a range of doses of either Americium-241 alpha particles (0.03-48 Gy) or 250 keV x-rays (0.5-24 Gy). Following a 24-hour reincubation and "expression" period, cells were examined for radiation-induced changes in overall viability, as well as in cell morphology and ultrastructure. Results indicated that neither quality of radiation had much effect on cell viability over dose ranges examined, but substantial changes in cell volume, surface topography, and cytoplasmic features were noted, especially in the alpha-particle-irradiated specimens. Results support the concept that the limiting plasma membrane of the targeted macrophage is a sensitive subcellular target for ionizing radiation, especially high-linear-energy-transfer heavy particles. RP SEED, TM (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439, USA. NR 19 TC 2 Z9 2 U1 0 U2 0 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 JUN PY 1991 VL 5 IS 2 BP 565 EP 572 PG 8 WC Microscopy SC Microscopy GA GC670 UT WOS:A1991GC67000025 PM 1947939 ER PT J AU LIU, CT AF LIU, CT TI INTERGRANULAR FRACTURE AND BORON EFFECTS IN NI3AL AND OTHER INTERMETALLICS - INTRODUCTORY PAPER SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-BOUNDARY STRENGTH; ROOM-TEMPERATURE DUCTILITY; LL2 ORDERED ALLOYS; BASE L12 ALLOYS; RAPID SOLIDIFICATION; TENSILE PROPERTIES; AL-ALLOYS; CHEMISTRY; NI3SI; SEGREGATION RP LIU, CT (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 79 TC 52 Z9 57 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 JUN PY 1991 VL 25 IS 6 BP 1231 EP 1236 DI 10.1016/0956-716X(91)90392-E PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300001 ER PT J AU VITEK, V CHEN, SP AF VITEK, V CHEN, SP TI MODELING OF GRAIN-BOUNDARY STRUCTURES AND PROPERTIES IN INTERMETALLIC COMPOUNDS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID RESOLUTION ELECTRON-MICROSCOPY; LL2 ORDERED ALLOYS; COMPUTER-SIMULATION; BRITTLE-FRACTURE; TILT BOUNDARIES; BODY POTENTIALS; NI3AL; BORON; STRENGTH; L12 C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP VITEK, V (reprint author), UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104, USA. NR 61 TC 42 Z9 43 U1 3 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN PY 1991 VL 25 IS 6 BP 1237 EP 1242 DI 10.1016/0956-716X(91)90393-F PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300002 ER PT J AU KING, AH FROST, HJ YOO, MH AF KING, AH FROST, HJ YOO, MH TI PLASTICITY ENHANCEMENT THROUGH DISORDERING AT GRAIN-BOUNDARIES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 DARTMOUTH COLL,THAYER SCH ENGN,HANOVER,NH 03755. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP KING, AH (reprint author), SUNY STONY BROOK,DEPT MAT SCI & ENGN,STONY BROOK,NY 11794, USA. RI King, Alexander/B-3148-2012; King, Alexander/P-6497-2015 OI King, Alexander/0000-0001-9677-3769; King, Alexander/0000-0001-7101-6585 NR 11 TC 6 Z9 6 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN PY 1991 VL 25 IS 6 BP 1249 EP 1252 DI 10.1016/0956-716X(91)90395-H PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300004 ER PT J AU GEORGE, EP WHITE, CL HORTON, JA AF GEORGE, EP WHITE, CL HORTON, JA TI GRAIN-BOUNDARY COHESION AND FRACTURE IN ORDERED INTERMETALLICS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ROOM-TEMPERATURE DUCTILITY; BORON-DOPED NI3AL; INTERGRANULAR FRACTURE; BRITTLE-FRACTURE; SEGREGATION; SULFUR; EMBRITTLEMENT; CHEMISTRY; STRENGTH; ALLOYS C1 MICHIGAN TECHNOL UNIV,DEPT MET & MAT ENGN,HOUGHTON,MI 49931. RP GEORGE, EP (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI White, Calvin/F-7981-2011; George, Easo/L-5434-2014 OI White, Calvin/0000-0003-1299-4375; NR 56 TC 21 Z9 21 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 JUN PY 1991 VL 25 IS 6 BP 1259 EP 1264 DI 10.1016/0956-716X(91)90397-J PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300006 ER PT J AU MILLS, MJ GOODS, SH FOILES, SM WHETSTONE, JR AF MILLS, MJ GOODS, SH FOILES, SM WHETSTONE, JR TI THE INFLUENCE OF BORON SEGREGATION ON THE STRUCTURE AND MECHANICAL-PROPERTIES OF BOUNDARIES IN BICRYSTALS OF NI3AL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-BOUNDARIES; ALLOYS C1 GM CORP,ALLISON GAS TURBINES DIV,INDIANAPOLIS,IN 46206. RP MILLS, MJ (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 13 TC 20 Z9 20 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN PY 1991 VL 25 IS 6 BP 1283 EP 1288 DI 10.1016/0956-716X(91)90401-L PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300010 ER PT J AU WALSTON, WS MOODY, NR BERNSTEIN, IM THOMPSON, AW AF WALSTON, WS MOODY, NR BERNSTEIN, IM THOMPSON, AW TI COMPARISONS OF KJIC AND KIC VALUES FROM TESTS ON A SINGLE-CRYSTAL NICKEL-BASE SUPERALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID FRACTURE-TOUGHNESS C1 SANDIA NATL LABS,LIVERMORE,CA 94550. IIT,CHICAGO,IL 60616. CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213. RP WALSTON, WS (reprint author), GEN ELECT AIRCRAFT ENGINES,CINCINNATI,OH 45215, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN PY 1991 VL 25 IS 6 BP 1333 EP 1337 DI 10.1016/0956-716X(91)90410-3 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300019 ER PT J AU CEREZO, A HETHERINGTON, MG HYDE, JM MILLER, MK AF CEREZO, A HETHERINGTON, MG HYDE, JM MILLER, MK TI A TOPOLOGICAL APPROACH TO MATERIALS CHARACTERIZATION SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ATOM PROBE; DECOMPOSITION C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP CEREZO, A (reprint author), UNIV OXFORD,DEPT MAT,PARKS RD,OXFORD OX1 3PH,ENGLAND. NR 10 TC 18 Z9 18 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN PY 1991 VL 25 IS 6 BP 1435 EP 1440 DI 10.1016/0956-716X(91)90429-5 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300038 ER PT J AU MARGOLIS, SB AF MARGOLIS, SB TI NEW ROUTES TO QUASI-PERIODIC COMBUSTION OF SOLIDS AND HIGH-DENSITY FLUIDS NEAR RESONANT HOPF-BIFURCATION POINTS SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE QUASI-PERIODIC COMBUSTION; RESONANCE; HOPF BIFURCATION ID CONDENSED PHASE COMBUSTION; FLAME PROPAGATION; ASYMPTOTIC THEORY; FUEL COMBUSTION; REACTION FRONT AB Steady, planar combustion waves propagating through solids and high-density fluids can lose stability to a time-periodic mode of burning via Hopf bifurcation as an activation-energy parameter increases past a critical value. However, if the combustion wave is confined in a long channel, there exist critical values of the transverse channel dimensions such that stability is simultaneously lost to two (or more) nonsteady modes of burning at a multiple eigenvalue of this parameter. In the present work, the case of bifurcation near a point of strong resonance from which multiple primary branches corresponding to a single pulsation frequency (but different spatial structures) emanate from the basic solution is considered. In contrast to the multiple-frequency case, the resulting amplitude equations contain transcendental terms which can lead to both secondary and isolated branches of multimodal time-periodic motions. In addition, the higher-order bifurcation of quasi-periodic waves can arise either through a classical Hopf bifurcation from a multimodal branch, or through a new type of nonlinear mechanism from a single-mode primary branch. RP MARGOLIS, SB (reprint author), SANDIA NATL LABS, COMBUST RES FACIL, LIVERMORE, CA 94551 USA. NR 23 TC 9 Z9 9 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1399 EI 1095-712X J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD JUN PY 1991 VL 51 IS 3 BP 693 EP 726 DI 10.1137/0151036 PG 34 WC Mathematics, Applied SC Mathematics GA FU251 UT WOS:A1991FU25100006 ER PT J AU MACKEN, CA HAGAN, PS PERELSON, AS AF MACKEN, CA HAGAN, PS PERELSON, AS TI EVOLUTIONARY WALKS ON RUGGED LANDSCAPES SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE EVOLUTIONARY WALKS; SOMATIC HYPERMUTATION; IMMUNE RESPONSE; COMBINATORIAL OPTIMIZATION ID IMMUNE-RESPONSE; MOLECULAR EVOLUTION; OPTIMAL STRATEGIES; OPTIMIZATION; ANTIBODY; AFFINITY; MODEL; IMMUNOLOGY; MATURATION; GENERATION AB The rapid evolution of antibody molecules during an immune response enables the immune system to respond efficiently to an immense variety of challenges. To investigate this response, a theory for molecular evolution in biological systems is developed and analyzed. A molecule can be represented as a sequence of N letters, with each letter being chosen from an alphabet of size a; for protein molecules the alphabet consists of the twenty amino acids, while for nucleic acids it consists of the four base pairs. Together, these a(N) possibilities form a sequence space S. It is assumed that a fitness can be assigned to each sequence in S; for the immune response the fitness is just the chemical affinity of the antibody for the immunizing antigen. Evolution is assumed to occur by random point mutations that change a single letter in the sequence, this defines the set of one-mutant neighbors of a sequence. It is assumed that the original sequence will be replaced by the one-mutant neighbor if and only if the mutant has a higher fitness than the original. Thus, molecular evolution is modeled as being a strictly uphill walk on a fitness landscape, with the landscape being determined by the function that assigns a fitness to each sequence in S. Here evolution is studied on a completely random fitness landscape; evolution on other landscapes is considered elsewhere. It is shown that the fitness landscape is characterized by a large number of local optima, and that evolutionary walks can be expected to become trapped fairly quickly at local optima, rather than at the global optimum. Various statistics of the trapping process are computed, such as the probability of being trapped on the kth mutational step, and the mean and variance of the number of steps to a local optimum. It is also shown that, on average, the local optimum obtained at the end of an evolutionary walk is closer to the global optimum than a randomly selected local optimum, thus establishing that the evolutionary process is more efficient than random search. Because not all mutations improve fitness, various statistics are examined that characterize the total number of mutations and the number of different mutations attempted during the evolutionary process. Finally, the theory is applied to somatic mutation during an immune response. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. UNIV CALIF LOS ALAMOS SCI LAB, DIV COMP & COMMUNICAT, LOS ALAMOS, NM 87545 USA. SANTA FE INST, SANTA FE, NM 87551 USA. NR 37 TC 40 Z9 40 U1 0 U2 3 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1399 EI 1095-712X J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD JUN PY 1991 VL 51 IS 3 BP 799 EP 827 DI 10.1137/0151040 PG 29 WC Mathematics, Applied SC Mathematics GA FU251 UT WOS:A1991FU25100010 ER PT J AU GRAY, LJ AF GRAY, LJ TI STORAGE TANK DESIGN SO SIAM REVIEW LA English DT Article DE VOLUME INTEGRAL; SYMBOLIC COMPUTATION AB A calculus problem arising in the operation of a storage tank for a chemical processing plant is described. Constructing an appropriate gauge for the storage tank requires computing the volume of water residing inside a tilted cylindrical pipe. RP GRAY, LJ (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831, USA. NR 1 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 0036-1445 J9 SIAM REV JI SIAM Rev. PD JUN PY 1991 VL 33 IS 2 BP 271 EP 274 DI 10.1137/1033052 PG 4 WC Mathematics, Applied SC Mathematics GA FQ976 UT WOS:A1991FQ97600005 ER PT J AU COOK, AK BECK, DM AF COOK, AK BECK, DM TI METROPOLITAN DOMINANCE VERSUS DECENTRALIZATION IN THE INFORMATION AGE SO SOCIAL SCIENCE QUARTERLY LA English DT Article ID HEADQUARTERS; MIGRATION; SOCIETY; SYSTEM; AREAS C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP COOK, AK (reprint author), WASHINGTON STATE UNIV, DEPT SOCIOL, PULLMAN, WA 99164 USA. NR 27 TC 9 Z9 9 U1 0 U2 0 PU UNIV TEXAS PRESS PI AUSTIN PA BOX 7819, AUSTIN, TX 78713-7819 SN 0038-4941 J9 SOC SCI QUART JI Soc. Sci. Q. PD JUN PY 1991 VL 72 IS 2 BP 284 EP 298 PG 15 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA FT404 UT WOS:A1991FT40400006 ER PT J AU FAINE, P KURTZ, SR RIORDAN, C OLSON, JM AF FAINE, P KURTZ, SR RIORDAN, C OLSON, JM TI THE INFLUENCE OF SPECTRAL SOLAR IRRADIANCE VARIATIONS ON THE PERFORMANCE OF SELECTED SINGLE-JUNCTION AND MULTIJUNCTION SOLAR-CELLS SO SOLAR CELLS LA English DT Article ID MODEL AB The sensitivities of selected single-junction and multijunction cells to variations in solar irradiance are presented. The one-sun spectral irradiance is varied as a function of air mass, optical aerosol depth (turbidity) and amount of precipitable water vapor for direct-normal and global-normal geometries. Several devices, including one-, two- and three- junction devices with low and high bandgaps and either series- or independent-connection schemes, were investigated. The effects of air mass and turbidity on the consistency of high-bandgap device performance are shown to be greater than the effect of precipitable water vapor. Low-bandgap devices are less affected by variations in air mass and turbidity, but are more sensitive to high water-vapor conditions. The efficiency gained by redesigning a multijunction device for the latitude at which it is expected to be used is shown to be less than about 3% (relative). RP FAINE, P (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 17 TC 84 Z9 84 U1 0 U2 10 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6787 J9 SOL CELLS PD JUN PY 1991 VL 31 IS 3 BP 259 EP 278 DI 10.1016/0379-6787(91)90027-M PG 20 WC Energy & Fuels SC Energy & Fuels GA FT607 UT WOS:A1991FT60700005 ER PT J AU ERIKSSON, O FERNANDO, GW ALBERS, RC BORING, AM AF ERIKSSON, O FERNANDO, GW ALBERS, RC BORING, AM TI ENHANCED ORBITAL CONTRIBUTION TO SURFACE MAGNETISM IN FE, CO, AND NI SO SOLID STATE COMMUNICATIONS LA English DT Article ID ELECTRONIC-STRUCTURE; THIN-FILMS; SPIN; INTERFACES; ANISOTROPY; METALS; OVERLAYERS; MONOLAYERS; FE(001); CO(001) AB We have, for the first time, theoretically determined the self-consistent orbital contribution to the magnetic moment on the (001) surfaces of Fe, Co and Ni. We used a surface geometry that corresponds to the bulk crystal structure with no relaxation of the surface. In addition to enhanced spin moments at the surface, we find that the orbital moment for surface states is greatly enhanced (sometimes by over 100%). C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP ERIKSSON, O (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 31 TC 44 Z9 44 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUN PY 1991 VL 78 IS 9 BP 801 EP 806 DI 10.1016/0038-1098(91)90624-5 PG 6 WC Physics, Condensed Matter SC Physics GA FQ979 UT WOS:A1991FQ97900005 ER PT J AU WENTZCOVITCH, RM MARTINS, JL AF WENTZCOVITCH, RM MARTINS, JL TI 1ST PRINCIPLES MOLECULAR-DYNAMICS OF LI - TEST OF A NEW ALGORITHM SO SOLID STATE COMMUNICATIONS LA English DT Article ID SPACE FORMALISM; TOTAL ENERGY; ABINITIO AB We have tested a new algorithm to perform first-principles molecular dynamics simulations. This new scheme differs from the Car-Parrinello method and is based on the calculation of the self-consistent solutions of the Kohn-Sham equations at each molecular dynamics timestep, using a fast iterative diagonalization algorithm. We do not use a fictitious electron dynamics, and therefore the molecular dynamics timesteps can be considerably larger in our method than in the Car-Parrinello algorithm. Furthermore, the number of basis functions is variable, which makes this method particularly suited to deal with simulations involving a cell with variable shape and volume. Applications of this method to liquid Li offers results which are in excelent agreement with experiment and indicates that it is basically comparable in efficiency to the Car-Parrinello method. C1 UNIV MINNESOTA, DEPT CHEM ENGN & MAT SCI, MINNEAPOLIS, MN 55455 USA. UNIV MINNESOTA, INST SUPERCOMP, MINNEAPOLIS, MN 55455 USA. RP WENTZCOVITCH, RM (reprint author), BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RI Martins, Jose Luis/F-3888-2011; Wentzcovitch, Renata/J-8768-2015 OI Martins, Jose Luis/0000-0002-9061-967X; NR 18 TC 89 Z9 89 U1 3 U2 15 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUN PY 1991 VL 78 IS 9 BP 831 EP 834 DI 10.1016/0038-1098(91)90629-A PG 4 WC Physics, Condensed Matter SC Physics GA FQ979 UT WOS:A1991FQ97900010 ER PT J AU COX, LE ELLIS, WP AF COX, LE ELLIS, WP TI CORE-LEVEL AND VALENCE-BAND X-RAY PHOTOELECTRON DIFFRACTION IN UO2(100) SO SOLID STATE COMMUNICATIONS LA English DT Article ID SINGLE-CRYSTAL TUNGSTEN; BINDING-ENERGY SHIFTS; AUGER-ELECTRON; PHOTOEMISSION; SCATTERING; SPECTROSCOPY; UO2; INTENSITIES; SURFACES; OXYGEN AB X-ray photoelectron diffraction (XPD) effects have been studied in the U 4f, O 1s and valence-band spectra of UO2(100). A simple nearest-neighbor forward-scattering model adequately explains the intensity modulations which occur with changes in polar angle, 0. In the valence band, the U 5f and U 6p3/2 peaks and the O 2p band show very similar angular intensity variations showing that the O 2p band's intensity is largely U-orbital derived. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. RP COX, LE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 24 TC 4 Z9 4 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUN PY 1991 VL 78 IS 12 BP 1033 EP 1037 DI 10.1016/0038-1098(91)90124-E PG 5 WC Physics, Condensed Matter SC Physics GA FV442 UT WOS:A1991FV44200005 ER PT J AU VANOOIJ, WJ SABATA, A APPELHANS, AD AF VANOOIJ, WJ SABATA, A APPELHANS, AD TI APPLICATION OF SURFACE-ANALYSIS TECHNIQUES TO THE STUDY OF PAINT METAL INTERFACES RELATED TO ADHESION AND CORROSION PERFORMANCE SO SURFACE AND INTERFACE ANALYSIS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON ADHESION AND SURFACE ANALYSIS CY APR 03-05, 1990 CL LOUGHBOROUGH UNIV, LOUGHBOROUGH, ENGLAND HO LOUGHBOROUGH UNIV ID STEELS AB Interfaces between galvanized steel and automotive cathodic electrocoat paint systems were characterized by imaging XPS and static SIMS, using time-of-flight SIMS and quadrupole SIMS with an SF6 primary source. Variables were the pretreatment of the metal (phosphate coating) and the cure state of the paint system. Analyses were carried out prior to and following exposure in an accelerated cyclic corrosion test. In systems without phosphate pretreatments, severe delamination was observed in non-corroded areas. In such areas, zinc hydroxycarbonate was found at the interface. In corroded areas, adhesion was retained, probably as a result of an interaction between cathodically generated OH- ions and the paint. In phosphated systems, an undercure of the paint led to an increase of the underfilm corrosion. Static SIMS analysis of the paint/metal interface demonstrated that the state of cure of cathodic electrocoat systems can be detected by this technique and, furthermore, that certain paint constituents are preferentially adsorbed on the metal surface. The degree of cure of the paint was shown to change in going from the air/paint surface to the bulk and on to the paint/metal interface. The adhesion behaviour of epoxy electrocoat systems to metallic substrates can be described in terms of acid-base interactions. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP VANOOIJ, WJ (reprint author), ARMCO INC,RES & TECHNOL,MIDDLETOWN,OH 45043, USA. NR 22 TC 33 Z9 33 U1 0 U2 6 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JUN PY 1991 VL 17 IS 7 BP 403 EP & DI 10.1002/sia.740170703 PG 0 WC Chemistry, Physical SC Chemistry GA FV520 UT WOS:A1991FV52000002 ER PT J AU HANER, AN ROSS, PN BARDI, U AF HANER, AN ROSS, PN BARDI, U TI THE SURFACE-STRUCTURE AND COMPOSITION OF (111) AND (100) ORIENTED SINGLE-CRYSTALS OF THE ORDERED ALLOY PT3SN SO SURFACE SCIENCE LA English DT Article ID DISORDER TRANSFORMATION; SANDWICH SEGREGATION; ATOMIC-STRUCTURE; 001 SURFACE; SN ALLOYS; LEED; SPECTROSCOPY; PLATINUM; PROFILE; PT(111) AB The surface composition and structure of [111] and [100] oriented single crystals of the ordered alloy Pt3Sn (Ll2 or Cu3Au-type) were determined using a combination of low-energy electron diffraction (LEED) and low-energy ion scattering spectroscopy (LEISS). The clean annealed surfaces displayed p(2 x 2) and c(2 x 2) LEED patterns, respectively, and the Sn/Pt LEISS intensity ratios at normal incidence were consistent with the surface compositions expected for bulk termination surface structures. In the case of the [100] crystal, preferential termination in the mixed (50% Sn) layer was indicated, which appears to be the consequence of the thermodynamic tendency for Sn to be at the surface. A strong variation in Sn/Pt LEISS intensity ratios with incidence angle was observed on both surfaces, indicating an outward displacement of tin atoms from the plane of platinum atoms. C1 UNIV FLORENCE,DEPT CHEM,I-50121 FLORENCE,ITALY. RP HANER, AN (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720, USA. RI Bardi, Ugo/L-1978-2015 OI Bardi, Ugo/0000-0003-2240-2070 NR 27 TC 42 Z9 42 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN PY 1991 VL 249 IS 1-3 BP 15 EP 20 DI 10.1016/0039-6028(91)90829-H PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FV267 UT WOS:A1991FV26700015 ER PT J AU WANDER, A HELD, G HWANG, RQ BLACKMAN, GS XU, ML DEANDRES, P VANHOVE, MA SOMORJAI, GA AF WANDER, A HELD, G HWANG, RQ BLACKMAN, GS XU, ML DEANDRES, P VANHOVE, MA SOMORJAI, GA TI A DIFFUSE LEED STUDY OF THE ADSORPTION STRUCTURE OF DISORDERED BENZENE ON PT(111) SO SURFACE SCIENCE LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; SURFACE-STRUCTURE DETERMINATION; ABSORPTION FINE-STRUCTURE; COADSORBED BENZENE; INTENSITY ANALYSIS; CARBON-MONOXIDE; SPECTROSCOPY; CO; SCATTERING; OVERLAYERS AB Previous LEED structural studies of benzene chemisorption on transition metal surfaces have relied on the presence of coadsorbed carbon monoxide to induce ordering in the overlayer. To investigate the effect of CO on the benzene structure, the disordered pure benzene layer chemisorbed on Pt(111) is studied by diffuse LEED intensity analysis. The diffuse LEED intensity has been measured using a digital LEED apparatus and analysed using an extension of the beam set neglect method. The benzene is found to chemisorb in a two-fold bridge site rotated by 30-degrees with respect to the site found for the ordered phase formed in the presence of coadsorbed CO. In addition, the benzene ring is found to be distorted. Parallel distortions are subject to large error bars, but perpendicular spacings have been more accurately determined. These include a buckling distortion not previously seen for benzene chemisorption on transition metal surfaces. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP WANDER, A (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Van Hove, Michel/A-9862-2008; de Andres, Pedro/B-2043-2010; Held, Georg/D-5468-2013; OI Van Hove, Michel/0000-0002-8898-6921; Held, Georg/0000-0003-0726-4183 NR 29 TC 120 Z9 120 U1 2 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN PY 1991 VL 249 IS 1-3 BP 21 EP 34 DI 10.1016/0039-6028(91)90830-L PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FV267 UT WOS:A1991FV26700016 ER PT J AU BALOOCH, M OLANDER, DR SIEKHAUS, WJ MILLER, DE AF BALOOCH, M OLANDER, DR SIEKHAUS, WJ MILLER, DE TI REACTION OF CHLORINE AND MOLYBDENUM BY MODULATED MOLECULAR-BEAM MASS-SPECTROMETRY SO SURFACE SCIENCE LA English DT Article ID SURFACE-DIFFUSION; HIGH-TEMPERATURES; URANIUM-DIOXIDE; LIQUID-METALS; LOW-PRESSURE; TANTALUM; FLUORINE; DESORPTION; KINETICS; HALOGENS AB The reaction of molecular chlorine with polycrystalline molybdenum was studied by the modulated molecular beam mass spectrometry technique. Between 300 and 900 K, MoCl2 was produced with a reaction probability of about 10(-3) on a chlorine-covered surface. At higher temperatures, the chlorine coverage decreased because of three direct reactions on the substrate metal: recombination to form Cl2; direct desorption of atomic chlorine; and a second reaction channel to produce MoCl2. Chlorine chemisorbed on the metal surface acquired sufficient mobility to move away from the spot illuminated by the incident molecular beam. By 1500 K, the only major processes remaining were chemisorption of incident Cl2 with near-unity sticking probability followed by rapid desorption of atomic chlorine. A kinetic model of the reaction, including all of the component elementary steps, was developed and compared to the data. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP BALOOCH, M (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 1 Z9 1 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN PY 1991 VL 249 IS 1-3 BP 322 EP 334 DI 10.1016/0039-6028(91)90856-N PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FV267 UT WOS:A1991FV26700042 ER PT J AU SCHMITZ, PJ KANG, HC LEUNG, WY THIEL, PA AF SCHMITZ, PJ KANG, HC LEUNG, WY THIEL, PA TI GROWTH MODE AND CO ADSORPTION PROPERTIES OF AU FILMS ON PD(110) SO SURFACE SCIENCE LA English DT Article ID ENERGY-ION-SCATTERING; RECONSTRUCTED AU(110) SURFACE; AUGER-ELECTRON SPECTROSCOPY; SINGLE-CRYSTAL SURFACES; THIN PD FILMS; FCC FE FILMS; PT(110)-(1X2) SURFACE; 110 SURFACE; DESORPTION SPECTROSCOPY; EPITAXIAL-GROWTH AB We describe a study of Au films, 1 to 7 monolayers thick, grown on Pd(110). The growth mode is elucidated by Auger electron spectroscopy and thermal desorption of carbon monoxide. The experimental data indicate that the films follow Stranski-Krastanov growth with a critical thickness of two monolayers, even at 130 K. CO exhibits desorption states at 225 and 190 K which we associate with adsorption on first and second layers of the Pd-modified Au surface, respectively. Ours is the first observation of CO stably adsorbed on Au(110) in vacuum. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. RI Kang, Hway Chuan/A-3401-2012 NR 66 TC 22 Z9 22 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD JUN PY 1991 VL 248 IS 3 BP 287 EP 294 DI 10.1016/0039-6028(91)91174-V PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FT731 UT WOS:A1991FT73100005 ER PT J AU SCHWARTZ, DT MULLER, RH AF SCHWARTZ, DT MULLER, RH TI OXIDATION FILMS ON COPPER IN ALKALINE MEDIA - INTENSITY MODULATED PHOTOELECTROCHEMICAL AND RAMAN-SPECTROSCOPY STUDIES SO SURFACE SCIENCE LA English DT Article ID ANODIC-OXIDATION; AQUEOUS-SOLUTIONS; METAL-ELECTRODES; OXIDE-FILMS; BEHAVIOR; ILLUMINATION; CORROSION; REDUCTION; GROWTH; LAYERS AB The composition of thin surface layers on copper oxidized in alkaline media has been determined by combining in situ intensity modulated photocurrent measurements and laser Raman spectroscopy with cyclic voltammetry. Photocurrent measurements showed that the high intensity (less-than-or-equal-to 250 W/cm2) laser Raman probe beam facilitated reduction of the oxidized surface. Laser-facilitated reduction was used to identify the presence of CuO and Cu2O and, when combined with Raman spectroscopy, to differentiate between the formation of CuO and Cu(OH)2 films. Raman spectra confirmed that a thin Cu2O film formed as oxidation of the copper surface was initiated. Increasing the potential produced a Cu(OH)2 layer on top of the Cu2O film. Further oxidation at higher potentials converted the Cu2O film to a CuO underlayer that coexisted with the Cu(OH)2 overlayer. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,BERKELEY,CA 94720. RP SCHWARTZ, DT (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 28 TC 30 Z9 30 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 JUN PY 1991 VL 248 IS 3 BP 349 EP 358 DI 10.1016/0039-6028(91)91181-V PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FT731 UT WOS:A1991FT73100012 ER PT J AU SHUSTOROVICH, E BELL, AT AF SHUSTOROVICH, E BELL, AT TI AN ANALYSIS OF FISCHER-TROPSCH SYNTHESIS BY THE BOND-ORDER-CONSERVATION-MORSE-POTENTIAL APPROACH SO SURFACE SCIENCE LA English DT Article ID TRANSIENT-RESPONSE TECHNIQUES; TRANSITION-METAL SURFACES; BOC-MP APPROACH; CO HYDROGENATION; CHAIN GROWTH; CARBON-MONOXIDE; METHANATION; MECHANISM; RUTHENIUM; CATALYSTS AB The BOC-MP (bond-order-conservation-Morse-potential) approach has been used to calculate the heats of chemisorption of adspecies and activation barriers for elementary reaction steps envisioned to occur during Fischer-Tropsch (F-T) synthesis over the periodic series Fe/W(110), Ni(111), Pt(111), and Cu(111). Dissociative adsorption of CO to form carbidic carbon is projected to occur spontaneously on Fe/W(110) and with a small activation barrier on Ni(111). The calculated barrier heights for this reaction on Pt(111) and Cu(111) are high enough to preclude appreciable dissociation of CO. Hydrogen-assisted dissociation of CO(s) is found to have an even smaller activation barrier on Fe/W and Ni, but not on Pt or Cu. On all the metal surfaces, the energetically preferred path for initiation of alkyl chain growth is via insertion of a CH2 group into the carbon-metal bond of a CH3 group. The activation barrier for CO insertion into the metal-carbon bond of a CH3 group is greater than that for CH2 insertion. As a consequence, the acetyl group formed by CO insertion serves mainly as a precursor to oxygenated products. On Fe/W, Ni, and Pt the activation barrier for termination of alkyl chain growth by beta-elimination of hydrogen is found to be lower than that for alpha-addition of hydrogen, and as a consequence olefins are projected to be formed more readily than paraffins. By using as examples Fe(100) and Fe(100)-c(2 x 2)C,O, it is shown that carburization of an Fe surface reduces the heats of adsorption of C, O, and CO, resulting in nondissociative chemisorption of CO, similar to that on Pt(111). The BOC-MP model projections are consistent with the available experimental data and contain claims that can be tested experimentally in the future. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT & CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP SHUSTOROVICH, E (reprint author), EASTMAN KODAK CO,CORP RES LABS,ROCHESTER,NY 14650, USA. OI Bell, Alexis/0000-0002-5738-4645 NR 52 TC 69 Z9 72 U1 2 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN PY 1991 VL 248 IS 3 BP 359 EP 368 DI 10.1016/0039-6028(91)91182-W PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FT731 UT WOS:A1991FT73100013 ER PT J AU HATCHER, RD AF HATCHER, RD TI INTERACTIVE PROPERTY OF LARGE THRUST SHEETS WITH FOOTWALL ROCKS - THE SUBTHRUST INTERACTIVE DUPLEX HYPOTHESIS - A MECHANISM OF DOME FORMATION IN THRUST SHEETS SO TECTONOPHYSICS LA English DT Article; Proceedings Paper CT CONF ON DEFORMATION AND PLATE TECTONICS CY SEP 07-09, 1987 CL GIJON, SPAIN ID OROGENIC BELTS AB Recently acquired Appalachian Ultradeep Core Hole (ADCOH) Project site investigation seismic reflection data and geologic data from the Appalachians and several other orogenic belts suggest an important mutually interdependent relationship exists between emplacement of large crystalline thrust sheets and the deforming foreland rocks beneath. This relationship suggests isolated domes beneath crystalline thrust sheets may be produced by passive folding of the sheet as a result of formation of an antiformal stack duplex in the platform sedimentary sequence beneath. Suggestions that domes in crystalline thrust sheets formed by interference of late open folds is doubtlessly still valid in places, but the platform duplex mechanism is probably also valid to explain the late doming of many crystalline and other large thrust sheets. The dome beneath the Shooting Creek and Brasstown Bald windows in the ADCOH site region is imaged as an antiformal stack duplex at depth. The Tallulah Falls dome, Grandfather Mountain and Mountain City windows, and Smokies Foothills duplex in the site region and elsewhere in the southern Blue Ridge are all late isolated domes and all are probably or demonstrably underlain by antiformal stack duplexes beneath the Blue Ridge-Piedmont composite crystalline thrust sheet. The Assynt window and footwall duplex beneath the Arnabol and Moine thrusts in Scotland, and the Engadine window in the Alps may be similar structures. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP HATCHER, RD (reprint author), UNIV TENNESSEE,DEPT GEOL SCI,KNOXVILLE,TN 37996, USA. NR 17 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-1951 J9 TECTONOPHYSICS JI Tectonophysics PD JUN 1 PY 1991 VL 191 IS 3-4 BP 237 EP 242 DI 10.1016/0040-1951(91)90059-2 PG 6 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FT069 UT WOS:A1991FT06900006 ER PT J AU HAYES, EF DARAKJIAN, Z WALKER, RB AF HAYES, EF DARAKJIAN, Z WALKER, RB TI BENCHMARK STUDIES OF THE BCRLM REACTIVE SCATTERING CODE - IMPLICATIONS FOR ACCURATE QUANTUM CALCULATIONS SO THEORETICA CHIMICA ACTA LA English DT Article DE CHEMICAL REACTIONS; QUANTUM DYNAMICS; PARALLEL COMPUTING ID ARRANGEMENT-CHANNEL APPROACH; DISCRETE VARIABLE REPRESENTATION; 3-DIMENSIONAL QUANTUM; FLUORINE ATOMS; CLASSICAL DYNAMICS; HYDROGEN MOLECULES; H+H2 SYSTEM; PROBABILITIES; ENERGY; HD AB The Bending Corrected Rotating Linear Model (BCRLM), developed by Hayes and Walker, is a simple approximation to the true multidimensional scattering problem for reactions of the type: A + BC --> AB + C. While the BCRLM method is simpler than methods designed to obtain accurate three-dimensional quantum scattering results, this turns out to be a major advantage in terms of our benchmarking studies. The computer code used to obtain BCRLM scattering results is written for the most part in standard FORTRAN and has been ported to several scalar, vector, and parallel architecture computers including the IBM 3090-600J, the Cray XMP and YMP, the Ardent Titan, IBM RISC System/6000, Convex C-1 and the MIPS 2000. Benchmark results will be reported for each of these machines with an emphasis on comparing the scalar, vector, and parallel performance for the standard code with minimum modifications. Detailed analysis of the mapping of the BCRLM approach onto both shared and distributed memory parallel architecture machines indicates the importance of introducing several key changes in the basic strategy and algorithms used to calculate scattering results. This analysis of the BCRLM approach provides some insights into optimal strategies for mapping three-dimensional quantum scattering methods, such as the Parker-Pack method, onto shared or distributed memory parallel computers. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP HAYES, EF (reprint author), RICE UNIV,DEPT CHEM,HOUSTON,TX 77251, USA. NR 39 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0040-5744 J9 THEOR CHIM ACTA JI Theor. Chim. Acta PD JUN PY 1991 VL 79 IS 3-4 BP 199 EP 213 DI 10.1007/BF01113692 PG 15 WC Chemistry, Physical SC Chemistry GA FT417 UT WOS:A1991FT41700006 ER PT J AU HOFFMAN, DK SHARAFEDDIN, OA KOURI, DJ CARTER, M NAYAR, N GUSTAFSON, J AF HOFFMAN, DK SHARAFEDDIN, OA KOURI, DJ CARTER, M NAYAR, N GUSTAFSON, J TI ON THE ROLE OF PARALLEL ARCHITECTURE SUPERCOMPUTERS IN TIME-DEPENDENT APPROACHES TO QUANTUM SCATTERING SO THEORETICA CHIMICA ACTA LA English DT Review DE WAVE PACKETS; INTEGRAL EQUATIONS; PARALLEL COMPUTING ID WAVE-PACKET APPROACH; REACTIVE MOLECULAR-COLLISIONS; ARRANGEMENT-CHANNEL APPROACH; INTEGRAL CROSS-SECTIONS; COLLINEAR H+H2 REACTION; FOURIER METHOD SOLUTION; GAS SURFACE SCATTERING; ATOM-DIATOM COLLISIONS; S-MATRIX ELEMENTS; SCHRODINGER-EQUATION AB Results of our initial study of the use of parallel architecture super-computers in solving time-dependent quantum scattering equations are reported. The specific equations solved are obtained from the time-dependent Lippmann-Schwinger integral equation by means of a quadrature approximation to the time integral. This leads to a modified Cayley transform algorithm in which the primary computational step is a matrix-vector multiplication. Implementation has been carried out both for the MasPar MP-1 and the NCUBE 6400 parallel machines. The codes are written in a modular form that greatly facilitates porting from one machine architecture to another. Both parallel machines prove to be more powerful for this application than the serial architecture VAX 8650. Specific analysis of machine performance is given. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,SCALABLE COMP FACIL,AMES,IA 50011. RP HOFFMAN, DK (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 123 TC 12 Z9 12 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0040-5744 J9 THEOR CHIM ACTA JI Theor. Chim. Acta PD JUN PY 1991 VL 79 IS 3-4 BP 297 EP 311 DI 10.1007/BF01113698 PG 15 WC Chemistry, Physical SC Chemistry GA FT417 UT WOS:A1991FT41700012 ER PT J AU MILLER, DJ AF MILLER, DJ TI ARTIFACTS OF SPECIMEN CHARGING IN X-RAY-MICROANALYSIS IN THE SCANNING ELECTRON-MICROSCOPE SO ULTRAMICROSCOPY LA English DT Article AB The effects of charging of uncoated, highly resistive samples on energy-dispersive X-ray spectra are examined. It is observed that as sample charging increases, the continuum background and characteristic peaks at higher X-ray energies diminish. Modelling of the continuum background has allowed this effect to be related to the development of a surface potential on the sample. This potential reduces the effective accelerating voltage of the electrons and results in a decreased overvoltage necessary for excitation of higher-energy X-rays. This artifact may lead to erroneous results in compositional analysis based on such charging-affected spectra. However, it is observed that many highly resistive samples of practical interest may be accurately analyzed without coating when only a small potential is developed. RP MILLER, DJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUN PY 1991 VL 35 IS 3-4 BP 357 EP 366 DI 10.1016/0304-3991(91)90088-N PG 10 WC Microscopy SC Microscopy GA FZ009 UT WOS:A1991FZ00900020 ER PT J AU LERNER, K AF LERNER, K TI GOVERNMENTAL NEGLIGENCE LIABILITY EXPOSURE IN DISASTER MANAGEMENT SO URBAN LAWYER LA English DT Article RP LERNER, K (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 9 TC 6 Z9 6 U1 0 U2 0 PU AMER BAR ASSOC PI CHICAGO PA 750 N LAKE SHORE DR ATTN:ORDER FULFILLMENT, CHICAGO, IL 60611 SN 0042-0905 J9 URBAN LAWYER JI Urban Lawyer PD SUM PY 1991 VL 23 IS 3 BP 333 EP 353 PG 21 WC Law; Urban Studies SC Government & Law; Urban Studies GA GF642 UT WOS:A1991GF64200002 ER PT J AU FONTAINE, TA AF FONTAINE, TA TI PREDICTING MEASUREMENT ERROR OF AREAL MEAN PRECIPITATION DURING EXTREME EVENTS SO WATER RESOURCES BULLETIN LA English DT Article DE SURFACE WATER HYDROLOGY; EXTREME RAINFALL; PRECIPITATION GAUGE NETWORKS; MEASUREMENT ERROR; PRECIPITATION ID RAINFALL; RUNOFF AB The areal mean precipitation (AMP) over a catchment is normally calculated using point measurements at rainfall gages. Error in AMP estimates occurs when an insufficient number of gages are used to sample precipitation which is highly variable in space. AMP error is investigated using historic, severe rainfalls with a set of hypothetical catchments and raingage networks. The potential magnitude of error is estimated for typical gage network densities and arrangements. Possible sources of error are evaluated, and a method is proposed for predicting the magnitude of error using data that are commonly available for severe, historic rainfall. RP FONTAINE, TA (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 17 TC 5 Z9 5 U1 0 U2 3 PU AMER WATER RESOURCES ASSOC PI HERNDON PA 950 HERNDON PARKWAY SUITE 300, HERNDON, VA 22070-5528 SN 0043-1370 J9 WATER RESOUR BULL JI Water Resour. Bull. PD JUN PY 1991 VL 27 IS 3 BP 509 EP 520 PG 12 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA GR495 UT WOS:A1991GR49500016 ER PT J AU BENSON, SM WHITE, AF HALFMAN, S FLEXSER, S ALAVI, M AF BENSON, SM WHITE, AF HALFMAN, S FLEXSER, S ALAVI, M TI GROUNDWATER CONTAMINATION AT THE KESTERSON RESERVOIR, CALIFORNIA .1. HYDROGEOLOGIC SETTING AND CONSERVATIVE SOLUTE TRANSPORT SO WATER RESOURCES RESEARCH LA English DT Article ID SAN-JOAQUIN VALLEY; SELENIUM AB Shallow groundwater under Kesterson Reservoir, Merced County, California, was contaminated over a period of 6 years while the reservior was used for disposal of brackish subsurface agricultural drainage water from farmlands in the San Joaquin Valley. Drainage water contained an average of 10,000 mg/L total dissolved solids (TDS), high concentrations of selenium (300-mu-g/L), nitrate (37 mg/L as nitrogen), boron (15 mg/L), and lesser amounts of mercury, chromium, and molybdenum. Infiltration and lateral migration of this water created a 20-m-deep plume of high-TDS, boron-rich water covering an area of about 5 km2. Transport of selenium and nitrate was inhibited by biogeochemical reactions in the pond bottom sediments, so that migration of these two constituents into the aquifer was limited. This paper focuses on physical parameters affecting seepage and lateral migration of nonreactive solutes and on hydrogeological factors associated with selenium break-through into the shallow aquifer. An accompanying paper describes biogeochemical processes that limit nitrate and selenium migration (White et al., this issue). The regional hydrogeologic system at Kesterson Reservoir is dominated by the presence of four lithostratigraphic units. These are, in order of increasing depth, a fine-grained surfical layer extending to depths of as much as 8 m, a semiconfined sandy aquifer extending to 60 m, a widespread lacustrine clay confining layer, and a confined sandy aquifer. Within each of these units, order of magnitude variations in the hydrologic properties of the sediments occur ubiquitously over lateral distances of tens of meters and vertical distances of a fraction of a meter. Seepage rates from the ponds into the underlying aquifer are dominated by local hydrogeologic properties and thickness of the fine-grained surface layer. Selenium migrated into the aquifer in an area where the fine-grained surface layer was thin or absent. Once in the aquifer, local rates of migration are controlled by the small-scale structure and hydrogeologic properties of the sediments. The aquifer is composed of a heterogeneous mixture of sands, silts, and clays. Individual sand beds, which average about 0.3 m thick, do not appear to extend over lateral distances of more than 30 m. The large range of velocities combined with a limited lateral extent of individual layers are expected to create a broadly dispersed plume of solutes migrating downgradient from Kesterson. A noninvasive electromagnetic survey of electrical conductivity distributions in the shallow aquifer appears to confirm this conceptual model for transport in the shallow aquifer. C1 US GEOL SURVEY,MENLO PK,CA 94025. RP BENSON, SM (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720, USA. NR 34 TC 24 Z9 24 U1 1 U2 12 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUN PY 1991 VL 27 IS 6 BP 1071 EP 1084 DI 10.1029/91WR00265 PG 14 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA FP651 UT WOS:A1991FP65100011 ER PT J AU MARTINEZ, MJ MCTIGUE, DF AF MARTINEZ, MJ MCTIGUE, DF TI THE STEADY DISTRIBUTION OF MOISTURE BENEATH A 2-DIMENSIONAL SURFACE SOURCE SO WATER RESOURCES RESEARCH LA English DT Article ID PERIODIC STRIP SOURCES; SCATTERING ANALOG; EXCLUSION PROBLEM; POROUS-MEDIA; INFILTRATION; CAVITIES; FLOW; SEEPAGE; SOIL AB The steady distribution of moisture beneath a two-dimensional strip source is analyzed by applying the quasi-linear approximation. The source is described by specifying either the moisture content or the infiltration rate. A water table is specified at some depth D below the surface, the depth varying from shallow to semi-infinite. Numerical solutions are determined, via the boundary integral equation method, as a function of the material inverse sorptive length alpha, the width of the strip source 2L, and the depth to the water table. The moisture introduced at the source is broadly spread below the surface when alpha-L << 1, for which absorption by capillary forces is dominant over gravity-induced flow. Conversely, the distribution becomes fingerlike along the vertical when alpha-L >> 1, where gravity is dominant over absorption. For a source described by specifying the moisture content, the presence of a water table at finite depth influences the infiltration through the source when alpha-D is less than about 4; infiltration rates obtained assuming the water table depth is semi-infinite are of sufficient accuracy for greater values of alpha-D. When the source is described by a specified infiltration flux, the maximum allowable value of this flux for which the material beneath the source remains unsaturated is determined as a function of nondimensional sorptive number and depth to the water table. RP MARTINEZ, MJ (reprint author), SANDIA NATL LABS,DEPT FLUID THERMAL & STRUCT SCI,ALBUQUERQUE,NM 87185, USA. NR 32 TC 8 Z9 8 U1 2 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUN PY 1991 VL 27 IS 6 BP 1193 EP 1206 DI 10.1029/91WR00437 PG 14 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA FP651 UT WOS:A1991FP65100020 ER PT J AU BENTLEY, AE AF BENTLEY, AE TI CONTROL OF PINCH WELDING USES QUANTITATIVE FEEDBACK THEORY SO WELDING JOURNAL LA English DT Article RP BENTLEY, AE (reprint author), SANDIA NATL LABS,PROC DEV & FABRICAT,ALBUQUERQUE,NM 87185, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUN PY 1991 VL 70 IS 6 BP 51 EP 63 PG 13 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA FP232 UT WOS:A1991FP23200005 ER PT J AU YAO, XQ FRANZEN, HF AF YAO, XQ FRANZEN, HF TI PREPARATION AND CRYSTAL-STRUCTURE OF NB6.74TA5.26S4 - A NEW COMPOUND IN THE TERNARY-SYSTEM TA-NB-S SO ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE LA English DT Article DE NIOBIUM TANTALUM SULFIDE; PREPARATION; CRYSTAL STRUCTURE AB Nb6.74Ta5.26S4 has been prepared by high temperature techniques. The crystal structure has been determined from single crystal X-ray diffraction data (R/R(w) = 0.0588/0.0655). The compound crystallizes in the orthorhombic space group Pnma with unit cell dimensions a = 959.11 (26) pm, b = 336.37 (10) pm, and c = 3282.51 (74) pm. The orthorhombic cell contains four formula units. Its structure is similar to that of Nb-rich sulfides, rather than to that of Ta-rich sulfides. The metal coordinations are capped distorted cubic prisms and pentagonal prisms while the coordinations of sulfur are capped trigonal prisms. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 16 TC 36 Z9 36 U1 0 U2 0 PU JOHANN AMBROSIUS BARTH VERLAG PI HEIDELBERG PA IM WEIHER 10, D-69121 HEIDELBERG, GERMANY SN 0044-2313 J9 Z ANORG ALLG CHEM JI Z. Anorg. Allg. Chem. PD JUN PY 1991 VL 598 IS 7-8 BP 353 EP 362 DI 10.1002/zaac.19915980132 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GE443 UT WOS:A1991GE44300031 ER PT J AU ULAN, JG GRONSKY, R SZOSTAK, R AF ULAN, JG GRONSKY, R SZOSTAK, R TI SENSITIVITY OF IRON SILICATE MORPHOLOGY AND CRYSTALLINITY TO SYNTHESIS GEL COMPOSITION SO ZEOLITES LA English DT Article DE MOLECULAR SIEVES; IRON SILICATES; ELECTRON MICROSCOPY; MICROSTRUCTURE; CRYSTALLINITY ID ZEOLITE ZSM-5; FERRISILICATE AB Electron microscopy has been applied to the study of iron silicates with the ZSM-5 structure. The microstructure and crystallinity of the products was very sensitive to alkali cation concentration and the SiO2/Fe2O3 ratio of the initial crystallization gel. In all cases, these materials crystallized as aggregates consisting of a shell of fused crystallites encasing smaller particles. The addition of alkali cations resulted in the crystallization of larger aggregates. Although the smaller particles within the aggregates were primarily crystalline, amorphous regions indicative of occluded gel were found inside aggregates, which appear highly crystalline when examined by X-ray diffraction. C1 GEORGIA INST TECHNOL,GEORGIA TECH RES INST,ZEOLITE RES PROGRAM,ATLANTA,GA 30332. RP ULAN, JG (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,DIV MAT & CHEM SCI,BERKELEY,CA 94720, USA. NR 20 TC 7 Z9 7 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0144-2449 J9 ZEOLITES JI Zeolites PD JUN PY 1991 VL 11 IS 5 BP 466 EP 471 DI 10.1016/S0144-2449(05)80119-8 PG 6 WC Chemistry, Physical SC Chemistry GA FU809 UT WOS:A1991FU80900009 ER PT J AU ULAN, JG GRONSKY, R SZOSTAK, R AF ULAN, JG GRONSKY, R SZOSTAK, R TI COMPOSITIONAL HETEROGENEITY IN IRON SILICATE MOLECULAR-SIEVE SYN-GAS CATALYSTS SO ZEOLITES LA English DT Article DE MOLECULAR SIEVES; IRON SILICATES; COMPOSITIONAL HETEROGENEITY; ANALYTICAL ELECTRON MICROSCOPY ID ZEOLITE ZSM-5; FERRISILICATE AB Analytical electron microscopy has been utilized to examine iron silicates with the ZSM-5 structure. The sensitivity of the iron distribution to synthesis gel composition was studied. The addition of a small excess of alkali cations to the initial crystallization gel resulted in large deviations in product iron distribution. Such an iron distribution would produce heterogeneous iron particle-size distributions and must be considered in choosing these materials for catalytic processes. C1 GEORGIA INST TECHNOL,GEORGIA TECH RES INST,ZEOLITE RES PROGRAM,ATLANTA,GA 30332. RP ULAN, JG (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,DIV MAT & CHEM SCI,BERKELEY,CA 94720, USA. NR 23 TC 2 Z9 2 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0144-2449 J9 ZEOLITES JI Zeolites PD JUN PY 1991 VL 11 IS 5 BP 472 EP 476 DI 10.1016/S0144-2449(05)80120-4 PG 5 WC Chemistry, Physical SC Chemistry GA FU809 UT WOS:A1991FU80900010 ER PT J AU CINKOSKY, MJ FICKETT, JW GILNA, P BURKS, C AF CINKOSKY, MJ FICKETT, JW GILNA, P BURKS, C TI ELECTRONIC DATA PUBLISHING AND GENBANK SO SCIENCE LA English DT Article ID LIBRARY AB GenBank, the national repository for nucleotide sequence data, has implemented a new model of scientific data management, which we term electronic data publishing. In traditional publishing, both scientific conclusions and supporting data are communicated via the printed page, and in electronic journal publishing, both types of information are communicated via electronic media. In electronic data publishing, by contrast, conclusions are published in a journal while data are published via a network-accessible, electronic database. RP CINKOSKY, MJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, THEORET BIOL & BIOPHYS GRP, F10, MS K710, LOS ALAMOS, NM 87545 USA. RI Gilna, Paul/I-3608-2016 OI Gilna, Paul/0000-0002-6542-0191 FU NIGMS NIH HHS [GM-7-2110] NR 31 TC 46 Z9 46 U1 0 U2 7 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD MAY 31 PY 1991 VL 252 IS 5010 BP 1273 EP 1277 DI 10.1126/science.1925538 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FN857 UT WOS:A1991FN85700030 PM 1925538 ER PT J AU SATCHLER, R AF SATCHLER, R TI HEAVY-ION REACTIONS - LECTURE NOTES, VOL 1, THE ELEMENTARY PROCESSES .1. ELASTIC AND INELASTIC REACTIONS .2. TRANSFER-REACTIONS - BROGLIA,RA, WINTHER,A SO SCIENCE LA English DT Book Review RP SATCHLER, R (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 31 PY 1991 VL 252 IS 5010 BP 1325 EP 1326 DI 10.1126/science.252.5010.1325 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FN857 UT WOS:A1991FN85700050 PM 17842957 ER PT J AU LI, J LASHIER, ME SCHRADER, GL GERSTEIN, BC AF LI, J LASHIER, ME SCHRADER, GL GERSTEIN, BC TI OXIDATION-STATES OF VANADIUM IN V-P-O OXIDATION CATALYSTS - P-31-NMR BY SPIN-ECHO MAPPING SO APPLIED CATALYSIS LA English DT Article DE CATALYST CHARACTERIZATION (P-31-NMR); NORMAL-BUTANE; OXIDATION CATALYSTS; OXIDATION STATES; VANADIUM-PHOSPHORUS OXIDES ID PHOSPHORUS OXIDE CATALYSTS; NORMAL-BUTANE OXIDATION; MALEIC-ANHYDRIDE SYNTHESIS; PHOSPHATE-BASED CATALYSTS; SELECTIVE OXIDATION; P/V RATIO; CHEMISTRY AB The oxidation state of vanadium in V-P-O catalysts before and after use has been examined using P-31 NMR spin echo mapping. The presence of V4+ and V5+ species could be detected for beta-VOPO4, (VO)2P2O7 and industrially-related materials with P/V = 0.9, 1.0, and 1.1. Magnetic susceptibility measurements were used to confirm the presence of para-magnetic vanadium in most catalysts which had been exposed to n-butane or 1-butene. Several models of active V-P-O catalysts have been offered previously which can be related to the NMR results. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM ENGN, AMES, IA 50011 USA. RP SCHRADER, GL (reprint author), US DOE, AMES LAB, AMES, IA 50011 USA. NR 41 TC 54 Z9 55 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-9834 J9 APPL CATAL PD MAY 30 PY 1991 VL 73 IS 1 BP 83 EP 95 DI 10.1016/0166-9834(91)85114-B PG 13 WC Chemistry, Physical SC Chemistry GA FR362 UT WOS:A1991FR36200011 ER PT J AU JAMES, VJ MCCONNELL, JF CAPEL, M AF JAMES, VJ MCCONNELL, JF CAPEL, M TI THE D-SPACING OF COLLAGEN FROM MITRAL HEART-VALVES CHANGES WITH AGING, BUT NOT WITH COLLAGEN TYPE-III CONTENT SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE X-RAY DIFFRACTION; COLLAGEN; AGING ID SKIN AB A low angle X-ray diffraction study of normal and myxomatous human heart valves has been carried out using a Synchrotron radiation source. This study has shown a slight progressive decrease in the d-spacing of the collagen with age. Despite suggestions reported in the literature, no significant relative change was observed in the d-spacing with the increase in the percentage of collagen type III from 24% in normal to 31% in myxomatous heart valves. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP JAMES, VJ (reprint author), UNIV NEW S WALES,DEPT BIOPHYS,REX VOWELS LOW ANGLE DIFFRACT LAB,POB 1,KENSINGTON,NSW 2033,AUSTRALIA. NR 8 TC 12 Z9 12 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD MAY 30 PY 1991 VL 1078 IS 1 BP 19 EP 22 DI 10.1016/0167-4838(91)90086-F PG 4 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FR992 UT WOS:A1991FR99200004 PM 2049380 ER PT J AU MARCHAJ, A KELLEY, DG BAKAC, A ESPENSON, JH AF MARCHAJ, A KELLEY, DG BAKAC, A ESPENSON, JH TI KINETICS OF THE REACTIONS BETWEEN ALKYL RADICALS AND MOLECULAR-OXYGEN IN AQUEOUS-SOLUTION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PULSE-RADIOLYSIS; RATE CONSTANTS; COMPLEXES; METHYL; SPECTRA; O2 AB The rate constant for the reaction R. + O2 --> ROO. in aqueous solution was determined for 18 alkyl radicals by laser flash photolysis. The values are all at the diffusion-controlled limit and lie in the range (1.6-4.9) x 10(9) L mol-1 s-1. The radicals studied are primary, substituted primary, secondary, and benzyl radicals. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. NR 26 TC 60 Z9 60 U1 0 U2 2 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 MAY 30 PY 1991 VL 95 IS 11 BP 4440 EP 4441 DI 10.1021/j100164a051 PG 2 WC Chemistry, Physical SC Chemistry GA FP241 UT WOS:A1991FP24100051 ER PT J AU BARTRAM, ME MICHALSKE, TA ROGERS, JW AF BARTRAM, ME MICHALSKE, TA ROGERS, JW TI A REEXAMINATION OF THE CHEMISORPTION OF TRIMETHYLALUMINUM ON SILICA SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; HYDROGEN SEQUESTERING AGENTS; DEHYDROXYLATED SILICA; ALUMINUM FILMS; OXIDE SURFACES; TRIMETHYLGALLIUM; DECOMPOSITION; SPECTROSCOPY; HYDRAZINE; ALKYLS AB Fourier transform infrared spectroscopy, temperature-programmed desorption, and X-ray photoelectron spectroscopy have been used to study the chemisorption and decomposition of trimethylaluminum (TMA) on silica under high vacuum. By annealing a series of silica substrates from 425 to 1573 K prior to TMA exposures at 300 K, we have examined the distributions of chemisorption products as a function of the relative concentrations of isolated hydroxyls (OH(i)), hydrogen-bonded hydroxyls (OH(H)), and siloxane bridges. The observed variation in the Si-methyl to Al-methyl population ratios supports a new chemisorption model in which a monomethylaluminum surface complex and methyl groups bonded to silicon are proposed as the majority species on the surface at 300 K. Although the initial reactive sticking probability for TMA on the silica substrates is < 0.01 at 300 K, TMA chemisorption affects OH(i), OH(H), and siloxane bridges on the surface with equivalent probability. The common reaction probability (equivalent rate constants) implies that similar requirements may be involved in the reactive adsorption that consumes each site. Decomposition of the monomethylaluminum adsorbate begins above 373 K and increases the population of methyl groups bonded to silicon on the surface. The methyl groups react to form methane(g) and ethane(g) and adsorbed hydrocarbon fragments. In addition, the methyl groups also react further with the surface to form tetramethylsilane(g). At coverages of one-third saturation and greater, the monomethylaluminum surface complex can also react with methyl groups to yield TMA(g) above 500 K. RP BARTRAM, ME (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 55 TC 91 Z9 91 U1 2 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 MAY 30 PY 1991 VL 95 IS 11 BP 4453 EP 4463 DI 10.1021/j100164a054 PG 11 WC Chemistry, Physical SC Chemistry GA FP241 UT WOS:A1991FP24100054 ER PT J AU AHN, MK ITON, LE AF AHN, MK ITON, LE TI SOLID-STATE CESIUM-133 NMR-STUDIES OF CATIONS IN CS/LI/NA ZEOLITE-A - AN EXAMPLE OF CATION DYNAMICS INVOLVING 3 SITES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID INDUCED ION-EXCHANGE; NUCLEI; CS-133; SHIFTS AB Cs-133 NMR spectra show marked changes in the line shape as a function of temperature for a fully hydrated zeolite A sample containing a mixture of Li+, Na+, and Cs+ ions. A single Lorentzian peak is observed at temperature above 285 K, and three resolvable peaks are observed at temperatures below 268 K. These three peaks arise from the Cs+ ion at the sites of the single eight-membered ring (S8R), the single six-membered ring (S6R), and the alpha-cage sites near the four-membered rings. The experimental line shapes are satisfactorily simulated by the modified Bloch equations that include the chemical exchange kinetics between these three sites. The analysis yields a lifetime, tau, of 0.12 ms for the Cs+ at S8R site at 297 K. The Arrhenius plot yields an activation energy of 44 kJ/mol for the site-exchange process of the charge-balancing Cs+ ions. The exchange between the S6R and S8R sites is considered to be the elementay step of the Cs+ diffusion process. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP AHN, MK (reprint author), INDIANA STATE UNIV,DEPT CHEM,TERRE HAUTE,IN 47809, USA. NR 30 TC 16 Z9 16 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 30 PY 1991 VL 95 IS 11 BP 4496 EP 4500 DI 10.1021/j100164a059 PG 5 WC Chemistry, Physical SC Chemistry GA FP241 UT WOS:A1991FP24100059 ER PT J AU MORTLOCK, RF BELL, AT CHAKRABORTY, AK RADKE, CJ AF MORTLOCK, RF BELL, AT CHAKRABORTY, AK RADKE, CJ TI EFFECT OF SILICATE RATIO ON THE DISTRIBUTION OF SILICATE AND ALUMINOSILICATE ANIONS IN TPA ALUMINOSILICATE SOLUTIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; SI-29 NMR-SPECTROSCOPY; POTASSIUM SILICATE; AQUEOUS-SOLUTION; CHEMICAL-SHIFTS; GROUND-STATES; EXCHANGE; RELAXATION; PRECURSORS; EQUILIBRIA AB Si-29 and Al-27 spectroscopies were used to characterize dilute, highly alkaline tetrapropylammonium (TPA) aluminosilicate solutions. The solution compositions ranged from 0.1 to 2 mol % SiO2, silicate ratios (R = [SiO2]/[(TPA)2O]) from 0.05 to 1, and Si/Al molar ratios from 0.25 to 5. Si-29 NMR resonances were observed for Al incorporation into the dimer, linear trimer, cyclic trimer, branched cyclic trimer, double three-membered ring (D3R), and double four-membered ring (D4R) anions. In aluminosilicate solutions with 2 mol % SiO2, silicate ratios of less than 1.5 lead to the stabilization of D3R(1Al) anions. The addition of DMSO to TPA aluminosilicate solutions provides the solutions with a high concentration of D3R(1Al) and D4R(1Al) anions. Semiempirical quantum mechanical calculations were performed to calculate the partial charges on Si atoms in silicate and aluminosilicate anionic structures. A correlation between the Si atom partial charge and its experimentally observed chemical shift assists in the assignment of Si-29 NMR peaks due to soluble aluminosilicates. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 53 TC 29 Z9 30 U1 0 U2 6 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 MAY 30 PY 1991 VL 95 IS 11 BP 4501 EP 4506 DI 10.1021/j100164a060 PG 6 WC Chemistry, Physical SC Chemistry GA FP241 UT WOS:A1991FP24100060 ER PT J AU FOLLANSBEE, PS GRAY, GT AF FOLLANSBEE, PS GRAY, GT TI DYNAMIC DEFORMATION OF SHOCK PRESTRAINED COPPER SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID STRAIN; SUBSTRUCTURE AB Measurements of yield stress and strain hardening behavior at strain rates in the range 10(-3)-10(4) s-1 are reported for copper that has been previously shock deformed at a shock pressure of 10 GPa. Characterization of the mechanical properties and microstructure, using transmission electron microscopy, showed that the hardening induced by the shock wave is equivalent to that achieved when copper is deformed at low strain rates to strains between 20% and 30%. Deformation in the shock-deformed material is analyzed using the internal-state-variable model applied by Follansbee and Kocks. The model adequately describes the stress levels, the strain hardening rate, and the dependence of the flow stress on strain rate measured for high strain rate compression tests on the shock-deformed material. RP FOLLANSBEE, PS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 32 TC 46 Z9 47 U1 0 U2 7 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1991 VL 138 IS 1 BP 23 EP 31 DI 10.1016/0921-5093(91)90673-B PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA FU709 UT WOS:A1991FU70900003 ER PT J AU LEE, CH YOON, SU AF LEE, CH YOON, SU TI EXISTENCE AND STABILITY OF GAUGED NONTOPOLOGICAL SOLITONS SO MODERN PHYSICS LETTERS A LA English DT Article AB Classical non-topological soliton configurations are considered in a theory with a local U(1) symmetry. Their existence, stability against dispersion into free particles are studied numerically. As in the case of Friedberg, Lee, and Sirlin with a global U(1) symmetry, also in this case there are two critical charges; Q(c) for the existence and Q(s) for the stability of the non-topological soliton configurations. Our numerical results show that the magnitudes of both Q(c) and Q(s) increase as the magnitude of the gauge coupling constant e is increased with the other parameters kept at fixed values. RP LEE, CH (reprint author), FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD MAY 30 PY 1991 VL 6 IS 16 BP 1479 EP 1486 DI 10.1142/S0217732391001597 PG 8 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA FT872 UT WOS:A1991FT87200006 ER PT J AU MATHEWS, GJ AF MATHEWS, GJ TI NUCLEOSYNTHESIS - FINDING THE PROTON DRIP LINE SO NATURE LA English DT Editorial Material RP MATHEWS, GJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAY 30 PY 1991 VL 351 IS 6325 BP 348 EP 349 DI 10.1038/351348a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FN856 UT WOS:A1991FN85600022 ER PT J AU HANDS, SJ KOGUT, JB RENKEN, R KOCIC, A SINCLAIR, DK WANG, KC AF HANDS, SJ KOGUT, JB RENKEN, R KOCIC, A SINCLAIR, DK WANG, KC TI MONOPOLE CONDENSATION AND THE DYNAMICS OF CHIRAL SYMMETRY-BREAKING IN NONCOMPACT LATTICE QED WITH DYNAMIC FERMIONS SO PHYSICS LETTERS B LA English DT Article ID QUANTUM ELECTRODYNAMICS; CONTINUUM-LIMIT; GAUGE-THEORIES; FINITE-SIZE AB We study the interplay of chiral symmetry breaking, strong vector forces, monopole condensation and four Fermi interactions in non-compact lattice quantum electrodynamics (QED) with N(f) species of almost massless fermions. For N(f) = 2 and 4 simulations on 10(4) and 16(4) lattices show that the chiral symmetry breaking transition is coincident with monopole condensation. This result implies that lattice non-compact QED in its current implementation cannot be used to study the properties of conventional continuum QED at strong bare couplings, but may be relevant to grand unification schemes containing abelian gauge sectors with monopoles. We present measurements of finite size scaling of the monopole susceptibility and the chiral equation of state. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP HANDS, SJ (reprint author), UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. OI Hands, Simon/0000-0001-5720-7852 NR 20 TC 16 Z9 16 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 30 PY 1991 VL 261 IS 3 BP 294 EP 302 DI 10.1016/0370-2693(91)90331-J PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FR714 UT WOS:A1991FR71400017 ER PT J AU COWAN, DO MAYS, MD MCCULLOUGH, RD KISTENMACHER, TJ POEHLER, TO BENO, MA KINI, AM WILLIAMS, JM KWOK, YK CARLSON, KD XIOA, L NOVOA, JJ WHANGBO, MH POUGET, JP AF COWAN, DO MAYS, MD MCCULLOUGH, RD KISTENMACHER, TJ POEHLER, TO BENO, MA KINI, AM WILLIAMS, JM KWOK, YK CARLSON, KD XIOA, L NOVOA, JJ WHANGBO, MH POUGET, JP TI STUDY OF TTEF-TCNQ AND RELATED-COMPOUNDS SO SYNTHETIC METALS LA English DT Meeting Abstract C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20707. ARGONNE NATL LAB,DIV CHEM & MAT SCI,ARGONNE,IL 60439. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. UNIV PARIS 11,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE. RP COWAN, DO (reprint author), JOHNS HOPKINS UNIV,DEPT CHEM,BALTIMORE,MD 21218, USA. RI Kini, Aravinda/F-4467-2012; Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2513 EP 2513 DI 10.1016/0379-6779(91)91415-7 PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100059 ER PT J AU BATISTIC, I BISHOP, AR GAMMEL, JT SAXENA, A AF BATISTIC, I BISHOP, AR GAMMEL, JT SAXENA, A TI THEORY OF MX CHAIN MATERIALS - A 2-BAND PEIERLS-HUBBARD MODEL SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID 2 BAND MODEL; DEFECT STATES; COMPLEXES AB Theoretical modeling of halogen-bridged mixed valence insulators such as [Pt(en)2] [Pt(en)2Cl2](ClO4)4 (en = N2C2H8) is described in terms of an extended peierls-Hubbard tight-binding model incorporating 3/4-filling of 2-bands. Ground and polaronic defects are described and characterized by optical absorption and by infra-red and resonance raman spectroscopy. Striking agreement with recent experiments is pointed out, including distinct asymmetry between electron- and hole-polarons. Finally, analogies are drawn with modeling of oxide high-temperature superconductors. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP BATISTIC, I (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 21 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2715 EP 2720 DI 10.1016/0379-6779(91)91459-N PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100103 ER PT J AU BATISTIC, I GAMMEL, JT BISHOP, AR AF BATISTIC, I GAMMEL, JT BISHOP, AR TI INCOMMENSURATE GROUND-STATES OF THE COMMENSURATE PEIERLS-HUBBARD HAMILTONIAN - SUPERLATTICE PHASES IN THE MX COMPOUNDS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID LINEAR-CHAIN COMPLEXES; 2 BAND MODEL; LATTICE STRUCTURE; TRANSITION AB We study a two-band Peierls-Hubbard model for halogen-bridged mixed-valence transition metal linear chain complexes (MX chains). Electron-electron correlations (both Hubbard and PPP-like expressions) are incorporated using several techniques. A sequence of long period (non-2k(F), superlattice) phases is found to occur even at exactly commensurate filling as the strength of on-site electron-phonon coupling is varied. These phases are understood as ordering of "bipolaronic" defects with respect to the commensurate 2k(F) or other states. Such long period phases may have been observed in MIX chains via STM experiments [1]. The superlattice phases are analogous to intrinsic twinning textures. The effect of including the electron-phonon in addition to the electron-electron interaction on the polaron/bipolaron (real space pairing) competition is especially interesting when this class of compounds is viewed as a 1-D analog of high T(c) superconductors. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BATISTIC, I (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2727 EP 2732 DI 10.1016/0379-6779(91)91461-I PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100105 ER PT J AU SWANSON, BI DONOHOE, RJ WORL, LA GAMMEL, JT SAXENA, A BATISTIC, I BISHOP, AR AF SWANSON, BI DONOHOE, RJ WORL, LA GAMMEL, JT SAXENA, A BATISTIC, I BISHOP, AR TI ULTRAGAP EDGE STATES IN MIXED HALIDE CHAIN SOLIDS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID VALENCE; 4; DEFECTS AB Resonance Raman spectroscopy has been performed above and below the intervalence charge transfer band for mixed halide [Pt(en)2][Pt(en)2X2](ClO4)4 (en = ethylenediamine. X = ClxBr1-x, Clxl1-x, and Brxl1-x) linear chain MX solids. Strong resonance enhancement is observed for local state vibrational modes in tuning between the band gaps of the constituent PtX species and well to the blue of the band gaps of both species in the case of PtBrxl1-x. These ultragap states have been attributed to edge states created by the junction between segments with different halides. In the case of PtClxBr1-x and PtBrxl1-x, we observe ultragap edge state vibrational modes at ca. 210 and 181 cm-1 that can be attributed to phonons dominated by the PtBr segment motions near the PtBr-PtCl interface; similar vibrational modes are observed for PtCl and Ptl segments in the mixed halide solids, Ultragap edge states are explicitly demonstrated within theoretical calculations of a discrete, 3/4-filled, 2-band, tight binding, extended Peierls-Hubbard model that employs mean-field and direct-space random phase approximations. C1 UNIV CALIF LOS ALAMOS SCI LAB,STAT PHYS & CONDENSED MATTER THEORY GRP,LOS ALAMOS,NM 87545. RP SWANSON, BI (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,INORGAN & STRUCT CHEM GRP,INC-4,MS C345,LOS ALAMOS,NM 87545, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2733 EP 2738 DI 10.1016/0379-6779(91)91462-J PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100106 ER PT J AU ALBERS, RC ALOUANI, M WILLS, JM SPRINGBORG, M AF ALBERS, RC ALOUANI, M WILLS, JM SPRINGBORG, M TI ELECTRONIC-PROPERTIES OF MIXED-VALENCE PT-BR CHAINS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID 2 BAND MODEL; COMPLEXES; STATES AB We present first-principles local-density-approximation (LDA) calculations on the electronic structure of the mixed-valence halogen-bridged transition-metal (MX) linear chain compound Pt2Br4(NH3)4 in simplified geometries; neither the ammonia ligands nor the dimerization were included. We present results on equilibrium lattice constants and on the tight-binding and Coulomb parameters needed for many-body models of this system. C1 UNIV CONSTANCE,FAK CHEM,W-7750 CONSTANCE,GERMANY. RP ALBERS, RC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET PHYS,LOS ALAMOS,NM 87545, USA. RI Alouani, Mebarek/A-9101-2011 OI Alouani, Mebarek/0000-0002-7985-5276 NR 15 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2739 EP 2743 DI 10.1016/0379-6779(91)91463-K PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100107 ER PT J AU DONOHOE, RJ WORL, LA BULOU, A SWANSON, BI GAMMEL, JT BISHOP, AR AF DONOHOE, RJ WORL, LA BULOU, A SWANSON, BI GAMMEL, JT BISHOP, AR TI SPECTROSCOPIC STUDIES OF POLARON AND BIPOLARON DEFECTS IN THE STRONGLY LOCALIZED CDW SOLID [PTII(EN)2][PTIV(EN)2CL2](CLO4)4 SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID VALENCE PLATINUM COMPLEXES; STATES AB The resonance Raman spectroscopy of defect states in [Pt(en)2][Pt(en)2Cl2](ClO4)4 serves to resolve the two intragap defect absorption features (A and B bands) located immediately to the red of the charge transfer band edge into five separate transitions. Of these five absorptions, two are associated with a mode at 263 cm-1, assigned to electron polarons, and two with a mode at 287 cm-1, assigned to hole polarons, while a fifth band, associated with a mode at 272 cm-1, is not readily assigned. Of the polaron absorptions, we find that the electron and hole defects exhibit offset absorptions in the order Ap- < Ap+ < Bp- < Bp+, where P- and P+ refer to electron and hole polarons, respectively. This energy asymmetry can be quantitatively reproduced by a two band 3/4-filled model that includes both the metal and halides bands. Alternatively, the asymmetry may be a result of preferential pinning of one type of polaron at a preexisting defect site on the lattice. Temperature dependence of the defect Raman signals shows that the 287 cm-1 hole polaron and the unassigned 272 cm-1 peaks are diminished by raising temperature from 12 to 200 K while the 263 cm-1 electron polaron signal gains relative intensity over this temperature range. C1 UNIV CALIF LOS ALAMOS SCI LAB,STAT PHYS & CONDENSED MATTER GRP,LOS ALAMOS,NM 87545. RP DONOHOE, RJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & NUCL CHEM GRP,INC-4,MS-C345,LOS ALAMOS,NM 87545, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2745 EP 2748 DI 10.1016/0379-6779(91)91464-L PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100108 ER PT J AU DONOHOE, RJ WORL, LA SWANSON, BI BULOU, A AF DONOHOE, RJ WORL, LA SWANSON, BI BULOU, A TI POLARONS AND BIPOLARONS IN WEAK 1-D CDW SOLIDS - SPECTRAL STUDIES OF LOCAL STATES IN [PTII(EN)2][PTIV(EN)2BR2](CLO4)4 AND [PTII(EN)2][PTIV(EN)2]2](CLO4)4 SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID COMPLEXES AB The Peierls distorted quasi one-dimensional solids [Pt(II)(en)2][pt(IV)(en)2Br2](ClO4)4 and [Pt(II)(en)2][Pt(IV)(en)2l2](ClO4)4, referred to as PtBr and Ptl, respectively, are weaker CDW solids than the chloride analogue, PtCl. The resonance Raman (RR) data for PtBr exhibit a broad feature at 130 cm-1 that has been assigned to an electron bipolaron. Most of this signal is lost upon warming the sample from 12 to 50 K but can be largely recovered upon recooling. This demonstrates interconversion of defects that we suggest is "melting" of electron bipolarons into electron polarons. PtBr undergoes a first order phase change near room temperature (28.7-degrees-C) that dramatically effects the resonance Raman (RR) data acquired with excitation energies below the charge transfer band edge, i.e., the intragap defect absorption region. Crystals grown at 40-degrees-C exhibit higher intensity for defect vibrational features when compared to data for crystals grown at 5-degrees-C. Ptl cannot be probed within the defect region, but RR data acquired above the band edge indicate that ultragap defect states are present, which is consistent with 3/4-filled two band description. C1 UNIV MAINE,FAC SCI,PHYS ETAT CONDENSE LAB,CNRS 807,F-72017 LE MANS,FRANCE. RP DONOHOE, RJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,INORGAN & STRUCT CHEM GRP,INC-4,MS-C345,LOS ALAMOS,NM 87545, USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2749 EP 2752 DI 10.1016/0379-6779(91)91465-M PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100109 ER PT J AU GAMMEL, JT BISHOP, AR EFSTATHIODIS, H PHILLPOT, SR AF GAMMEL, JT BISHOP, AR EFSTATHIODIS, H PHILLPOT, SR TI LATTICE-DYNAMICS OF GROUND-STATES AND EXCITATIONS IN THE 3/4-FILLED, 2-BAND PEIERLS-HUBBARD HAMILTONIAN FOR MX CHAINS SO SYNTHETIC METALS LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP GAMMEL, JT (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Phillpot, Simon/J-9117-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2753 EP 2753 DI 10.1016/0379-6779(91)91466-N PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100110 ER PT J AU GAMMEL, JT WEBERMILBRODT, SM BISHOP, AR MARIANER, S LOH, EY REICHL, J AF GAMMEL, JT WEBERMILBRODT, SM BISHOP, AR MARIANER, S LOH, EY REICHL, J TI EFFECTS OF ELECTRON-ELECTRON CORRELATIONS AND QUANTUM PHONONS IN A 3/4-FILLED, 2-BAND PEIERLS-HUBBARD HAMILTONIAN FOR MX CHAINS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID MODEL; SUPERCONDUCTIVITY AB We have studied the effects of electron-electron (e-e) correlations on the ground state and excitations of MX chains within a 3/4-filled two-band discrete Peierls-Hubbard model with on-site and inter-site electron-phonon (e-p) couplings. We have used perturbation theory, Hartree-Fock and exact diagonalization for classical adiabatic phonons, and a variational approach allowing for finite phonon frequency (quantum phonons). We compare model predictions with experiments on MX chains. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV BAYREUTH,INST PHYS,W-8580 BAYREUTH,GERMANY. UNIV MINNESOTA,TATE LAB PHYS,MINNEAPOLIS,MN 55455. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. SIEMENS AG,W-8000 MUNICH 1,GERMANY. RP GAMMEL, JT (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, 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 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2755 EP 2759 DI 10.1016/0379-6779(91)91467-O PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100111 ER PT J AU GAMMEL, JT SAXENA, A BISHOP, AR AF GAMMEL, JT SAXENA, A BISHOP, AR TI CHANGES IN THE SPECTROSCOPIC SIGNATURES FOR POLARONIC AND BIPOLARONIC DEFECTS IN MX CHAINS AS A FUNCTION OF VALENCE DELOCALIZATION SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID COMPLEXES AB We consider a two-band discrete tight-binding Peierls-Hubbard model for an isolated chain of a halogen-bridged, mixed-valence, transition metal linear chain complex (MX chain). We investigate various intrinsic excitations - kinks, polarons, bipolarons - and their corresponding optical absorption features as functions of the model parameters. The systematics of going from the strongly distorted charge-density-wave limit to the undistorted spin-density-wave limit is probed and compared to the experimental variation in the PtCl/PtBr/PtI and the PtBr/PdBr/NiBr series. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV BAYREUTH,INST PHYS,W-8580 BAYREUTH,GERMANY. RP GAMMEL, JT (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2761 EP 2765 PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100112 ER PT J AU GAMMEL, JT BISHOP, AR DONOHOE, RJ SWANSON, BI AF GAMMEL, JT BISHOP, AR DONOHOE, RJ SWANSON, BI TI VIBRATIONAL AND ELECTRONIC SIGNATURES FOR POLARONS AND BIPOLARONS IN MX CHAINS - EVIDENCE FOR ELECTRON-HOLE ASYMMETRY SO SYNTHETIC METALS LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP GAMMEL, JT (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2766 EP 2766 DI 10.1016/0379-6779(91)91469-Q PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100113 ER PT J AU HAY, PJ MARTIN, RL BOYLE, CA AF HAY, PJ MARTIN, RL BOYLE, CA TI MOLECULAR ELECTRONIC-STRUCTURE APPROACHES TO FINITE ASSEMBLIES AS MODELS FOR PLATINUM HALOGEN AND OTHER ONE-DIMENSIONAL M-X CHAIN COMPOUNDS SO SYNTHETIC METALS LA English DT Meeting Abstract RP HAY, PJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2768 EP 2768 PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100115 ER PT J AU HUCKETT, SC ARRINGTON, CA BURNS, CJ CLARK, DL SWANSON, BI AF HUCKETT, SC ARRINGTON, CA BURNS, CJ CLARK, DL SWANSON, BI TI NEW CHAIN MATERIALS FROM BINUCLEAR METAL-COMPLEXES SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID RAY AB Reaction of RU2(O2CR)4 (R = H, Me, Et, n-Pr, Ph) and bis(2,5-dimethyl-N,N'-dicyanoquinonediimine) (DMDCNQI) produces blue/black to purple materials. On the basis of analytical and spectral data these compounds are formulated as linear chains of Ru2(5+) metal centers bridged by radical anionic DMDCNQI ligands. RP HUCKETT, SC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & NUCL CHEM GRP,INC-4,MS C-345,LOS ALAMOS,NM 87545, USA. RI Clark, David/A-9729-2011 NR 11 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2769 EP 2772 DI 10.1016/0379-6779(91)91472-M PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100116 ER PT J AU HUCKETT, SC DONOHOE, RJ WORL, LA BULOU, ADF BURNS, CJ SWANSON, BI AF HUCKETT, SC DONOHOE, RJ WORL, LA BULOU, ADF BURNS, CJ SWANSON, BI TI ON THE ORIGIN OF THE RESONANCE RAMAN V1 DISPERSION AND FINE-STRUCTURE OF PTBR SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID VALENCE; 4; SPECTROSCOPY; COMPLEXES; DEFECTS AB The standard preparative route to [Pten2][Pten2Br2](ClO4)4 (PtBr, where en = H2NCH2CH2NH2) results in Cl- impurities in the product. A study of resonance Raman (RR) spectra of PtBr as a function of chloride ion doping illustrates that the 166 cm-1 component of the RR spectrum corresponds to the chain axis v1 mode. Previously reported v1 dispersion and fine structure and several other resonance enhanced defect vibrations are shown to result from chloride doping of the PtBr solid. RP HUCKETT, SC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & NUCL CHEM GRP,INC-4,MS C-345,LOS ALAMOS,NM 87545, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2773 EP 2776 DI 10.1016/0379-6779(91)91473-N PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100117 ER PT J AU HUCKETT, SC GARCIA, E LAIA, JR CARROLL, D SWANSON, BI AF HUCKETT, SC GARCIA, E LAIA, JR CARROLL, D SWANSON, BI TI THE EFFECT OF CHLORIDE DOPING ON THE CRYSTAL-STRUCTURE OF THE MIXED-VALENCE LINEAR-CHAIN [PTEN2][PTEN2BR2](CLO4)4 SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID SALT ANALOGS AB Chloride ion doping of [Pten2][Pten2Br2](ClO4)4 (PtBr, where en = H2NCH2CH2NH2) results in crystalline solids with a solid solubility that ranges from pure PtBr to pure PtCl. The previously reported monoclinic and orthorhombic forms of PtBr are shown to arise form differing chloride impurity concentrations and resulting changes in critical temperatures (T(c)). Similar structural phase transformations for pure PtBr, PtBr (55% Cl), and PtCl were observed (T(c) = 28.7, 25.5, 19.8-degrees-C, respectively). C1 UNIV CALIF LOS ALAMOS SCI LAB,POLYMER & COATINGS GRP,LOS ALAMOS,NM 87545. RP HUCKETT, SC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & NUCL CHEM GRP,INC-4,MS C-345,LOS ALAMOS,NM 87545, 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 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2777 EP 2780 DI 10.1016/0379-6779(91)91474-O PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100118 ER PT J AU BISHOP, AR GAMMEL, JT BATISTIC, I SWANSON, BI DONOHOE, RJ AF BISHOP, AR GAMMEL, JT BATISTIC, I SWANSON, BI DONOHOE, RJ TI MX CHAIN MATERIALS AS TUNABLE 1-D-ANALOGS OF OXIDE SUPERCONDUCTORS SO SYNTHETIC METALS LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BISHOP, AR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2795 EP 2795 DI 10.1016/0379-6779(91)91479-T PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100123 ER PT J AU WEINRACH, J HAWLEY, M HUCKETT, S SWANSON, BI AF WEINRACH, J HAWLEY, M HUCKETT, S SWANSON, BI TI STM STUDIES OF MMX AND MX CHAINS - EXPERIMENTAL-EVIDENCE FOR SUPERLATTICE STRUCTURE IN QUASI-ONE-DIMENSIONAL CDW SOLIDS SO SYNTHETIC METALS LA English DT Meeting Abstract RP WEINRACH, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 29 PY 1991 VL 42 IS 3 BP 2801 EP 2801 DI 10.1016/0379-6779(91)91481-O PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV611 UT WOS:A1991FV61100125 ER PT J AU SMITH, HB HARTMAN, FC AF SMITH, HB HARTMAN, FC TI DEMONSTRATION OF A FUNCTIONAL REQUIREMENT FOR THE CARBAMATE NITROGEN OF RIBULOSEBISPHOSPHATE CARBOXYLASE OXYGENASE BY CHEMICAL RESCUE SO BIOCHEMISTRY LA English DT Article ID RIBULOSE-BISPHOSPHATE CARBOXYLASE; SITE-DIRECTED MUTAGENESIS; 1,5-BISPHOSPHATE CARBOXYLASE; CARBON-DIOXIDE; ACTIVE-SITE; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; ACTIVATION; COMPLEX; ENZYME; RESTORATION AB Ribulosebisphosphate carboxylase/oxygenase is reversibly activated by the reaction of CO2 with a specific lysyl residue (Lys191 of the Rhodospirillum rubrum enzyme) to form a carbamate that coordinates an essential Mg2+ cation. Surprisingly, the Lys191 --> Cys mutant protein, in the presence of CO2 and Mg2+, exhibits tight binding of the reaction intermediate analogue 2-carboxyarabinitol bisphosphate [Smith, H. B., Larimer, F. W., & Hartman, F. C. (1988) Biochem. Biophys. Res. Commun. 152, 579-584], a property normally equated with effective coordination of the Mg2+ by the carbamate. Catalytic ineptness of the Cys191 mutant protein, despite its ability to coordinate Mg2+ properly, might be due to the absence of the carbamate nitrogen. To investigate this possibility, we have evaluated the ability of exogenous amines to restore catalytic activity to the mutant protein. Significantly, the Cys191 protein manifests ribulose bisphosphate dependent fixation of (CO2)-C-14 when incubated with aminomethanesulfonate but not ethanesulfonate. This novel activity reflects a K(m) value for ribulose bisphosphate which is not markedly perturbed relative to wild-type enzyme, a K(m) for Mg2+ which is in fact decreased 10-fold, and rate saturation with respect to aminomethanesulfonate (K(d) = 8 mM). Chromatographic and spectrophotometric analyses reveal the product of CO2 fixation to be D-3-phosphoglycerate, while turnover of [1-H-3]ribulose bisphosphate into [H-3]phosphoglycolate confirms oxygenase activity. We conclude that aminomethanesulfonate restored ribulosebisphosphate carboxylase/oxygenase activities to the Cys191 mutant protein by providing a nitrogenous function which satisfies a catalytic demand normally met by the carbamate nitrogen of Lys191. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. NR 28 TC 24 Z9 24 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 28 PY 1991 VL 30 IS 21 BP 5172 EP 5177 DI 10.1021/bi00235a009 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FN552 UT WOS:A1991FN55200009 PM 1903652 ER PT J AU GRIMSDITCH, M RIVIER, N AF GRIMSDITCH, M RIVIER, N TI ANOMALY IN CP/CV - A POSSIBLE SIGNATURE OF A LIQUID-GLASS TRANSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID BRILLOUIN-SCATTERING; LIGHT-SCATTERING; HYPERSONIC RELAXATION; SUPERCOOLED LIQUIDS; PENTACHLOROBIPHENYL; MIXTURE AB Brillouin scattering from two classic glass-forming materials, ZnCl2 and glycerol, reveals a maximum in the ratio (gamma) of specific heats C(p) and C(v) as a function of temperature. We propose that the temperature at which the maximum in gamma occurs in our materials may be indicative of a "liquid-like" to "solid-like" transformation. As such it may be a convenient thermodynamic signature of a 'glass' transition. RP GRIMSDITCH, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 30 TC 14 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1991 VL 58 IS 21 BP 2345 EP 2347 DI 10.1063/1.104920 PG 3 WC Physics, Applied SC Physics GA FM820 UT WOS:A1991FM82000009 ER PT J AU MOTOOKA, T HOLLAND, OW AF MOTOOKA, T HOLLAND, OW TI AMORPHIZATION PROCESSES IN SELF-ION-IMPLANTED SI - DOSE DEPENDENCE SO APPLIED PHYSICS LETTERS LA English DT Article ID RAMAN-SPECTRUM; SILICON; DAMAGE AB The structural transformation in self-ion-implanted Si has been investigated using Raman spectroscopy and Rutherford backscattering spectrometry. The crystal Si Raman peak at 520 cm-1 decreased, broadened, and shifted toward lower wave numbers as the 100 keV Si+ dose was increased from 0.8 X 10(14) cm-2. These peak shifts can be attributed to uniaxial lattice expansion in the direction normal to the Si surface and they are substantially larger than those predicted in uniaxially strained crystal Si. The results suggest that accumulated defects generated by ion bombardment not only expand the crystal Si lattice but also reduce the force constant which in turn increases plasticity and finally gives rise to amorphization of the Si lattice. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MOTOOKA, T (reprint author), UNIV TSUKUBA,INST APPL PHYS,SAKURA,IBARAKI 305,JAPAN. NR 10 TC 45 Z9 45 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1991 VL 58 IS 21 BP 2360 EP 2362 DI 10.1063/1.104871 PG 3 WC Physics, Applied SC Physics GA FM820 UT WOS:A1991FM82000014 ER PT J AU WARREN, WL RONG, FC POINDEXTER, EH KANICKI, J GERARDI, GJ AF WARREN, WL RONG, FC POINDEXTER, EH KANICKI, J GERARDI, GJ TI LOW-TEMPERATURE ELECTRON-SPIN-RESONANCE INVESTIGATIONS OF SILICON PARAMAGNETIC DEFECTS IN SILICON-NITRIDE SO APPLIED PHYSICS LETTERS LA English DT Article ID DANGLING-BOND CENTERS; AMORPHOUS-SILICON; CORRELATION-ENERGY; 1ST OBSERVATION; FILMS; ILLUMINATION; CHARGE; STATES AB We have reproduced and extended some recently reported electron spin resonance (ESR) measurements related to the nature of the dominant charge traps in silicon nitride. We detected defect centers at low temperatures using ESR, in both as-deposited and ultraviolet-irradiated silicon nitride powders and films prepared by low-pressure chemical vapor deposition (LPCVD). Only two silicon dangling bond defects were observed in the silicon nitride, one at g = 2.003 (.Si= N3), and the other at g = 2.005 (.Si= Si3). The signal intensity at g = 2.003 is by far the dominant signal in the LPCVD films and powders subjected to UV illumination; the signal at g = 2.005 is only about 3% of its intensity. These results support the idea that there is just one dominant silicon paramagnetic center (.Si = N3), which is responsible for charge trapping in silicon nitride. C1 USA,ELECTR TECHNOL & DEVICES LAB,FT MONMOUTH,NJ 07703. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. WILLIAM PATERSON STATE COLL,DEPT CHEM,WAYNE,NJ 07470. RP WARREN, WL (reprint author), SANDIA NATL LABS,DIV ELECTR PROPERTIES MAT,ALBUQUERQUE,NM 87185, USA. RI Kanicki, Jerzy/E-2753-2016 OI Kanicki, Jerzy/0000-0002-3649-8360 NR 29 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 27 PY 1991 VL 58 IS 21 BP 2417 EP 2419 DI 10.1063/1.104889 PG 3 WC Physics, Applied SC Physics GA FM820 UT WOS:A1991FM82000033 ER PT J AU SHANK, CV AF SHANK, CV TI LABORATORY WASTE-DISPOSAL SO CHEMICAL & ENGINEERING NEWS LA English DT Letter C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD MAY 27 PY 1991 VL 69 IS 21 BP 3 EP 3 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA FN279 UT WOS:A1991FN27900006 ER PT J AU BELTRAN, S HOOPER, HH BLANCH, HW PRAUSNITZ, JM AF BELTRAN, S HOOPER, HH BLANCH, HW PRAUSNITZ, JM TI MONTE-CARLO STUDY OF POLYELECTROLYTE ADSORPTION - ISOLATED CHAINS ON A PLANAR CHARGED SURFACE SO MACROMOLECULES LA English DT Article ID POLY-ELECTROLYTE ADSORPTION; WEAK POLYELECTROLYTES; LATTICE THEORY AB Monte Carlo simulations are presented for the adsorption of a lattice-model isolated polyelectrolyte on an impenetrable, oppositely charged surface. We consider the effects of chain ionization, chain hydrophobicity, surface charge density, and solution ionic strength on the conformational and interfacial properties of the model system. The overall conformational properties of the model polyelectrolytes in the adsorbed state are similar to those of isolated polyelectrolytes in solution; however, the adsorbed chains are conformationally anisotropic. This anisotropy is described here by calculating the components of the polymer end-to-end distance in directions parallel and orthogonal to the interface. Detailed structural features of the adsorbed chains are described by the distributions of tails, trains, and loops. Tails are favored at low degrees of chain ionization, while trains become more favorable at high degrees of ionization. The number of adsorbed chain segments (e.g., degree of adsorption) increases with the surface charge density and decreases with increasing solution ionic strength; for some conditions, this degree of adsorption is a strong function of solution and surface properties. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. OI Beltran, Sagrario/0000-0003-2559-3925 NR 23 TC 38 Z9 38 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 27 PY 1991 VL 24 IS 11 BP 3178 EP 3184 DI 10.1021/ma00011a021 PG 7 WC Polymer Science SC Polymer Science GA FN849 UT WOS:A1991FN84900021 ER PT J AU AMUNDSON, KR REIMER, JA DENN, MM AF AMUNDSON, KR REIMER, JA DENN, MM TI INVESTIGATION OF MICROSTRUCTURE IN POLY[(PARA-HYDROXYBENZOIC ACID)-CO-(ETHYLENE TEREPHTHALATE)] USING NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY SO MACROMOLECULES LA English DT Article ID CHAIN THERMOTROPIC COPOLYESTERS; PARA-ACETOXYBENZOIC ACID; MESOPHASE MACROMOLECULES; AROMATIC POLYESTERS; PHASE-TRANSITIONS; MOLECULAR MOTIONS; SOLID-STATE; POLY(ETHYLENE-TEREPHTHALATE); C-13; MORPHOLOGY AB The microstructure and dynamics of liquid crystalline copolymers of p-hydroxybenzoic acid (HBA) and ethylene terephthalate (ETP) were investigated by proton and C-13 solid-state NMR spectroscopy. The HBA/ETP 80/20 (80 mol % HBA) copolymer contains poly(HBA)-like crystallites with a mass fraction of 4-7% and a smallest linear dimension of about 80 angstrom. The dominant crystal structures in HBA/ETP 60/40 (60 mol % HBA) have a similar mass fraction but resemble poly(ethylene terephthalate) crystallites. NMR spin-lock relaxation indicates cooperative motion in both copolymers above 130-degrees-C involving small angular fluctuations of the local polymer chain axis about the local nematic director. A minority "rigid" component in HBA/ETP 80/20, which is 22-28% abundant at 150-degrees-C and about 15% abundant at 290-degrees-C, does not exhibit cooperative motion. HBA/ETP 60/40 displays similar behavior. Static C-13 NMR line shapes indicate that aromatic rings exhibit free rotation about the polymer chain axis within the component that exhibits cooperative motion, while aromatic rings exhibit small-angle (approximately 20-degrees) fluctuations about their substituted axes in the rigid component. C-13 MAS NMR shows that the compositions of the rigid components in both copolymers above 130-degrees-C are nearly the same as the bulk compositions. The observed behavior is consistent with the presence of nonperiodic layer crystallites. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 30 TC 18 Z9 18 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 27 PY 1991 VL 24 IS 11 BP 3250 EP 3260 DI 10.1021/ma00011a033 PG 11 WC Polymer Science SC Polymer Science GA FN849 UT WOS:A1991FN84900033 ER PT J AU GREEN, PF AF GREEN, PF TI TUBE RENEWAL EFFECTS IN BINARY POLYMER MIXTURES SO MACROMOLECULES LA English DT Article ID SELF-DIFFUSION; TEMPERATURE-DEPENDENCE; COPOLYMER STRUCTURES; ENTANGLED POLYMERS; MELTS; DYNAMICS; VISCOELASTICITY; HOMOPOLYMERS; PREDICTIONS; REPTATION AB The effects of tube renewal on the diffusion of deuterated polystyrene (d-PS) into binary mixtures of polystyrene (PS) and poly(vinyl methyl ether) (PVME) were examined by using elastic recoil detection (ERD). The molecular weight and volume fraction, phi, of PVME were kept constant in each mixture while the molecular weight of PS was allowed to vary. The contribution of tube renewal to the diffusivity of the d-PS chains was smaller in these mixtures than observed for the diffusion of d-PS into PS hosts. A model based on the work of Klein and Graessley was developed to describe these observations. The relaxation times of the PVME chains in the mixtures were extracted from the data. This information, together with the relaxation times of the d-PS chains, was used to calculate the temperature dependence of the viscosity. The calculated values are in surprisingly good agreement with independent viscosity measurements. RP GREEN, PF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 30 TC 19 Z9 19 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 27 PY 1991 VL 24 IS 11 BP 3373 EP 3376 DI 10.1021/ma00011a051 PG 4 WC Polymer Science SC Polymer Science GA FN849 UT WOS:A1991FN84900051 ER PT J AU GREEN, PF ADOLF, DB GILLIOM, LR AF GREEN, PF ADOLF, DB GILLIOM, LR TI DYNAMICS OF POLYSTYRENE POLY(VINYL METHYL-ETHER) BLENDS SO MACROMOLECULES LA English DT Article ID SELF-DIFFUSION COEFFICIENT; COMPATIBLE POLYMER MIXTURES; TEMPERATURE-DEPENDENCE; MUTUAL DIFFUSION; TUBE MODEL; ATACTIC POLYSTYRENE; RHEOLOGICAL PROPERTIES; POLY(PROPYLENE OXIDE); DISSIMILAR CHAINS; MOLECULAR THEORY AB Diffusion and viscosity measurements were performed on compatible binary mixtures of polystyrene (PS) and poly(vinyl methyl ether) (PVME). Elastic recoil detection (ERD) studies show that the diffusion coefficient, D(G), of deuterated polystyrene (PS-d) chains into highly entangled mixtures of PS/PVME is well described by D(G) approximately M-2, where M is the molecular weight of the PS-d chains. Under conditions of T - T(g) = 100-degrees-C, where T(g) is the glass transition temperature of the blend, the composition dependence of the friction factor of the PS-d chains exhibited a very large positive deviation from predictions made by the rule of additivity. The zero-shear-rate bulk viscosity, eta, of the system exhibited a similar trend. Temperature-dependent measurements of the diffusivity of PS-d chains in a blend containing a weight fraction of phi = 0.4 of PVME and of the viscosity of the same blend revealed, within the limits of experimental error, that both log eta and log (T/D(G)) exhibited the same dependence on temperature. RP GREEN, PF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 59 TC 57 Z9 57 U1 0 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 27 PY 1991 VL 24 IS 11 BP 3377 EP 3382 DI 10.1021/ma00011a052 PG 6 WC Polymer Science SC Polymer Science GA FN849 UT WOS:A1991FN84900052 ER PT J AU DIXON, LJ KAPLUNOVSKY, VS LOUIS, J AF DIXON, LJ KAPLUNOVSKY, VS LOUIS, J TI MODULI DEPENDENCE OF STRING LOOP CORRECTIONS TO GAUGE COUPLING-CONSTANTS SO NUCLEAR PHYSICS B LA English DT Article ID CONFORMAL FIELD-THEORY; LOW-ENERGY LIMIT; SUPERSYMMETRY BREAKING; SUPERSTRING THEORIES; LOCAL SUPERSYMMETRY; WORLD SHEET; INVARIANCE; CONDENSATION; ORBIFOLDS; DUALITY AB We consider one-loop corrections DELTA-a to inverse gauge couplings g(a)-2 in supersymmetric vacua of the heterotic string. The form of these corrections plays an important role in scenarios for dynamical supersymmetry breaking in string theory. Specifically, we calculate the exact functional dependence of DELTA-a(U) on any untwisted modulus field U of an orbifold vacuum; it has the universal form DELTA-a(U,UBAR) = A(a) . log(\eta(U)\4 . Im U) + const., where A(a) are easily computable rational constants. The dependence is nontrivial (A(a) not-equal 0) only if some sectors of the orbifold Hilbert space have precisely N = 2 space-time supersymmetry. The expression for DELTA-a has an expected invariance under modular transformations of U, since these are symmetries of the orbifold vacuum state. However, DELTA-a is not the real part of a holomorphic function, in seeming contradiction with the existence of a supersymmetric effective lagrangian. The apparent paradox is an infrared problem, and can occur not just in string theory but in renormalizable supersymetric field theories as well. We show how the paradox is resolved in the field theory case and argue that the same resolution applies also to the string theory case. C1 UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. RP DIXON, LJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 58 TC 537 Z9 537 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 MAY 27 PY 1991 VL 355 IS 3 BP 649 EP 688 DI 10.1016/0550-3213(91)90490-O PG 40 WC Physics, Particles & Fields SC Physics GA FL649 UT WOS:A1991FL64900003 ER PT J AU MATTHIAS, BE AHN, HE BADERTSCHER, A CHMELY, F ECKHAUSE, M HUGHES, VW JUNGMANN, KP KANE, JR KETTELL, SH KUANG, Y MUNDINGER, HJ NI, B ORTH, H PUTLITZ, GZ SCHAEFER, HR WITKOWSKI, MT WOODLE, KA AF MATTHIAS, BE AHN, HE BADERTSCHER, A CHMELY, F ECKHAUSE, M HUGHES, VW JUNGMANN, KP KANE, JR KETTELL, SH KUANG, Y MUNDINGER, HJ NI, B ORTH, H PUTLITZ, GZ SCHAEFER, HR WITKOWSKI, MT WOODLE, KA TI NEW SEARCH FOR THE SPONTANEOUS CONVERSION OF MUONIUM TO ANTIMUONIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID NON-CONSERVATION; SILICA-POWDER; NEUTRINO MASS; VIOLATION; LEPTON AB To search for spontaneous conversion of muonium to antimuonium with very low background, a new signature was implemented that required the coincident detection of the decay products of the antimuonium atom, the energetic e- and the atomic e+. No conversion events were seen, which sets an improved upper limit of 6.5 x 10(-7) (90% C.L.) on the conversion probability. The corresponding limit on the coupling constant, using a V - A form for the conversion Hamiltonian, is G(MMBAR) < 0.16G(F) (90% C.L.), where G(F) is the Fermi coupling constant. C1 YALE UNIV,NEW HAVEN,CT 06520. COLL WILLIAM & MARY,WILLIAMSBURG,VA 23185. GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY. PAUL SCHERRER INST,CH-5234 VILLIGEN,SWITZERLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP MATTHIAS, BE (reprint author), UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY. RI Jungmann, Klaus/A-7142-2010; jungmann, klaus/H-1581-2013 OI jungmann, klaus/0000-0003-0571-4072 NR 28 TC 47 Z9 47 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 MAY 27 PY 1991 VL 66 IS 21 BP 2716 EP 2719 DI 10.1103/PhysRevLett.66.2716 PG 4 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600008 ER PT J AU SCHNEIDER, BI RESCIGNO, TN LENGSFIELD, BH MCCURDY, CW AF SCHNEIDER, BI RESCIGNO, TN LENGSFIELD, BH MCCURDY, CW TI ACCURATE ABINITIO TREATMENT OF LOW-ENERGY ELECTRON COLLISIONS WITH ETHYLENE SO PHYSICAL REVIEW LETTERS LA English DT Article ID RESONANT VIBRATIONAL-EXCITATION; KOHN VARIATIONAL METHOD; POLYATOMIC-MOLECULES; SCATTERING AB We report the results of a complex Kohn variational calculation of the low-energy electron scattering from ethylene, C2H4. Our calculations are the first to confirm the existence of the Ramsauer-Townsend effect in a molecule which possesses a permanent quadrupole moment and suggest that such minima may be found in electron-scattering cross sections for many nonpolar molecules. The calculations also reveal a low-energy shape resonance in 2B2g symmetry at 1.83 eV, in excellent agreement with both beam and swarm measurements. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. RP SCHNEIDER, BI (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,T-12,LOS ALAMOS,NM 87545, USA. NR 18 TC 36 Z9 36 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1991 VL 66 IS 21 BP 2728 EP 2730 DI 10.1103/PhysRevLett.66.2728 PG 3 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600011 ER PT J AU KIM, KJ AF KIM, KJ TI SPECTRAL BANDWIDTH IN FREE-ELECTRON-LASER OSCILLATORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MODE COMPETITION; COHERENCE; RADIATION; OPERATION; LINEWIDTH; WIGGLER AB The evolution of the spectral bandwidth in free-electron-laser (FEL) oscillators is studied and found to be different for different saturation characteristics: For weakly saturated FELs in storage rings, the limiting bandwidth is given by that derived in the supermode theory; for linac-based FELs, where the gain reduction due to the high-intensity effect is significant, it is determined by the Fourier transform of the electron pulse length; for the case of a dc beam, it is given by a Schawlow-Townes formula, but the approach to the limit is very slow. RP UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 25 TC 9 Z9 9 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 MAY 27 PY 1991 VL 66 IS 21 BP 2746 EP 2749 DI 10.1103/PhysRevLett.66.2746 PG 4 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600016 ER PT J AU DELARUBIA, TD GUINAN, MW AF DELARUBIA, TD GUINAN, MW TI NEW MECHANISM OF DEFECT PRODUCTION IN METALS - A MOLECULAR-DYNAMICS STUDY OF INTERSTITIAL-DISLOCATION-LOOP FORMATION IN HIGH-ENERGY DISPLACEMENT CASCADES SO PHYSICAL REVIEW LETTERS LA English DT Article ID CU; NI; SIMULATION; ALLOYS AB We present molecular-dynamics computer-simulation studies of 25-keV displacement cascades in Cu at low temperature. We observe the splitting of a cascade into subcascades and for the first time show by molecular dynamics that cascades in metals may lead to the formation of both vacancy and interstitial dislocation loops. We propose a new mechanism of defect production based on interstitial prismatic dislocation-loop formation and discuss its consequences regarding the primary state of damage in irradiated metals. RP DELARUBIA, TD (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-644,LIVERMORE,CA 94550, USA. NR 25 TC 175 Z9 175 U1 0 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1991 VL 66 IS 21 BP 2766 EP 2769 DI 10.1103/PhysRevLett.66.2766 PG 4 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600021 ER PT J AU BADDORF, AP PLUMMER, EW AF BADDORF, AP PLUMMER, EW TI ENHANCED SURFACE ANHARMONICITY OBSERVED IN VIBRATIONS ON CU(110) SO PHYSICAL REVIEW LETTERS LA English DT Article ID COPPER 110 SURFACE; THERMAL-EXPANSION; HIGH-TEMPERATURE; METAL-SURFACES; SCATTERING; DIFFRACTION; DYNAMICS; RESONANCES AB Surface anharmonicity has been measured on Cu(110) by examining the temperature dependence of surface phonons with atomic motion normal to the surface using high-resolution electron-energy-loss spectroscopy. At the Brillouin zone center GAMMA-BAR the energy of the MS7 resonance decreases by 3.2 meV and the intrinsic width increases by 8.6 meV as the temperature increases from 21 to 766 K. Energy decrease and width increase are also observed at the Brillouin zone edge YBAR in the S3 phonon. The percentage energy decrease is the same in both phonons. Direct comparison with bulk-phonon measurements shows that the anharmonicity at the surface is 4.1-4.8 times greater than in the bulk. C1 UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP BADDORF, AP (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Baddorf, Arthur/I-1308-2016 OI Baddorf, Arthur/0000-0001-7023-2382 NR 23 TC 66 Z9 66 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1991 VL 66 IS 21 BP 2770 EP 2773 DI 10.1103/PhysRevLett.66.2770 PG 4 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600022 ER PT J AU COLVIN, VL ALIVISATOS, AP TOBIN, JG AF COLVIN, VL ALIVISATOS, AP TOBIN, JG TI VALENCE-BAND PHOTOEMISSION FROM A QUANTUM-DOT SYSTEM SO PHYSICAL REVIEW LETTERS LA English DT Article ID UV PHOTOELECTRON-SPECTROSCOPY; SEMICONDUCTOR CLUSTERS; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; CADMIUM-SULFIDE; WURTZITE CDS; SURFACE; SIZE; MICROCRYSTALLITES; COLLOIDS AB We report the first application of valence-band photoemission to a quantum-dot system. Photoemission spectra of cadmium sulfide quantum dots, ranging in size from 12 to 35 angstrom radius, were obtained using photon energies of 20 to 70 eV. The spectra are qualitatively similar to those obtained for bulk cadmium sulfide, but show a shift in the valence-band maximum with size. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,CONDENSED MATTER & ANALYT SCI,LIVERMORE,CA 94550. RP COLVIN, VL (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Tobin, James/O-6953-2015; Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 24 TC 153 Z9 153 U1 4 U2 25 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1991 VL 66 IS 21 BP 2786 EP 2789 DI 10.1103/PhysRevLett.66.2786 PG 4 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600026 ER PT J AU THEILER, J AF THEILER, J TI SOME COMMENTS ON THE CORRELATION DIMENSION OF 1/F-ALPHA NOISE SO PHYSICS LETTERS A LA English DT Article ID 1/F NOISE; FRACTAL DIMENSION; DYNAMICAL-SYSTEMS; TIME-SERIES; TURBULENCE; SPECTRA; INTERMITTENCY; ATTRACTORS AB It has recently been observed by Osborne and Provenzale that a stochastic (infinite degree of freedom) time series with a 1/f-alpha power spectrum can exhibit a finite correlation dimension, even for arbitrarily large data sets. I will discuss the relevance of this observation to the practical estimation of dimension from a time series, and in particular I will argue that a good dimension algorithm need not be trapped by this anomalous fractal scaling. Further, I will analytically treat the case of Gausian 1/f-alpha noise, with explicit high and low frequency cutoffs, and derive the scaling of the correlation integral C(N, r) in various regimes of the (N, r) plane. RP THEILER, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,COMPLEX SYST GRP,MS-B213,LOS ALAMOS,NM 87545, USA. NR 28 TC 208 Z9 210 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 27 PY 1991 VL 155 IS 8-9 BP 480 EP 493 DI 10.1016/0375-9601(91)90651-N PG 14 WC Physics, Multidisciplinary SC Physics GA FQ323 UT WOS:A1991FQ32300009 ER PT J AU MANGEL, WF LIN, B RAMAKRISHNAN, V AF MANGEL, WF LIN, B RAMAKRISHNAN, V TI CONFORMATION OF ONE-CHAIN AND 2-CHAIN HIGH-MOLECULAR-WEIGHT UROKINASE ANALYZED BY SMALL-ANGLE NEUTRON-SCATTERING AND VACUUM ULTRAVIOLET CIRCULAR-DICHROISM SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID AMINO-ACID-SEQUENCE; PLASMINOGEN-ACTIVATOR; ESCHERICHIA-COLI; MASS UROKINASE; SECONDARY STRUCTURE; BINDING-SITES; PRO-UROKINASE; HIGH-AFFINITY; HUMAN-URINE; RECEPTOR AB The structures of one- and two-chain high molecular weight human urokinase were analyzed by small-angle neutron scattering and vacuum ultraviolet circular dichroism. Both one- and two-chain high molecular weight urokinases exhibited a radius of gyration of 31 angstrom and a maximum dimension of 90 angstrom. Neither parameter was affected by the presence of lysine sufficient to saturate all the lysine-binding sites in human plasminogen. These physical parameters are consistent with the sedimentation coefficient of high molecular weight urokinase and indicate that both proteins are highly asymmetric. Neither protein contained much alpha-helix or parallel beta-sheet. Most of the secondary structure was in the form of antiparallel beta-sheet and beta-turns, very similar to the secondary structure of plasminogen. The macroscopic kinetic constants, K(m) and k(cat), for the hydrolysis of (< Glu-Gly-Arg-NH)2-rhodamine by two-chain high molecular weight urokinase and low molecular weight urokinase which lacks the epidermal growth factor and kringle domains were similar. These structural and kinetic data are consistent with the domains in both forms of urokinase being independent structural and functional units. RP MANGEL, WF (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 57 TC 9 Z9 9 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAY 25 PY 1991 VL 266 IS 15 BP 9408 EP 9412 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FM459 UT WOS:A1991FM45900014 PM 2033041 ER PT J AU ROTHMAN, S UNDERWOOD, J MCQUAID, K GRENDELL, J AF ROTHMAN, S UNDERWOOD, J MCQUAID, K GRENDELL, J TI THE RELATIONSHIP BETWEEN THE LIGHT-SCATTERING PROPERTIES OF ZYMOGEN GRANULES AND THE RELEASE OF THEIR CONTAINED PROTEINS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article ID CELLULAR MEMBRANES; GUINEA PIG; PANCREAS; INVITRO; BEHAVIOR; ENZYMES; SIZE; PH AB The optical density of suspensions of the digestive enzyme-containing zymogen granule, a roughly spherical 1-mu-m diameter membrane-enclosed subcellular structure isolated from the exocrine pancreas of mammals, is reduced greatly when they are suspended in physiological media. This reduction in optical density is accompanied by the release of the granule's protein contents. It has traditionally been assumed that this property is due to granule lysis; that is, dissolution of the particle and its consequent disappearance as a strongly scattering object. Thus, lysis would decrease optical density by decreasing the number density of suspended spheres (N) according to Beer's law. However, as a general matter, changes in the optical density of suspensions of spheres may be a function of changes in the refractive index (m) or radius (r) of the objects as well. In this study, we apply Mie theory of scattering by small particles, which, in conjunction with Beer's law, allows us to evaluate whether changes in the scattering properties of granule suspensions are due to changes in N, m or r. Scattering by granule suspensions was reduced in three ways - pH, calcium ion concentration, and detergent concentration. A simple reduction in particle number did not account for decreased scattering and protein release in any of these circumstances. Instead, the changes appear attributable to decreases in particle size and refractive index. C1 UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP ROTHMAN, S (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,2-400,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 28 TC 5 Z9 5 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 MAY 24 PY 1991 VL 1074 IS 1 BP 85 EP 94 DI 10.1016/0304-4165(91)90044-H PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FQ679 UT WOS:A1991FQ67900016 PM 2043685 ER PT J AU GOLSHANSHIRAZI, S GUIOCHON, G AF GOLSHANSHIRAZI, S GUIOCHON, G TI USE OF THE LEVAN - VERMEULEN ISOTHERM MODEL FOR THE CALCULATION OF ELUTION BAND PROFILES IN NONLINEAR CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID NONLINEAR LIQUID-CHROMATOGRAPHY; COLUMN SATURATION CAPACITIES; DISPLACEMENT CHROMATOGRAPHY; MOBILE PHASE; 2 COMPONENTS; SEPARATION; ADSORPTION; MIXTURE; PROPAGATION; DIFFERENCE AB The two-term LeVan-Vermeulen isotherm is the simplest competitive isotherm based on the ideal adsorbed solution model. It applies when both components follow individually the single-component Langmuir isotherm model. It takes into account the influence of the difference in the column saturation capacity for these two components. Individual band profiles calculated with this isotherm are in qualitative agreement with experimental results. They exhibit a stronger displacement effect, a weaker tag-along effect and a higher degree of band separation than predicted by the Langmuir competitive isotherm when the column saturation capacity is larger for the second component than for the first. Conversely, when the column saturation capacity is larger for the first component than for the second, the displacement effect is less intense and the tag-along effect is stronger than with the competitive Langmuir isotherm and the separation deteriorates. When the sample size is increased, a reversal of the elution order is observed. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DEPT ANALYT CHEM,OAK RIDGE,TN 37831. NR 28 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD MAY 24 PY 1991 VL 545 IS 1 BP 1 EP 26 DI 10.1016/S0021-9673(01)88692-1 PG 26 WC Chemistry, Analytical SC Chemistry GA FQ109 UT WOS:A1991FQ10900001 ER PT J AU LAMBERT, SJ KABALKA, GW KNAPP, FF SRIVASTAVA, PC AF LAMBERT, SJ KABALKA, GW KNAPP, FF SRIVASTAVA, PC TI INDUCTIVE EFFECT OF POSITIVELY CHARGED NITROGEN ON THE ADDITION OF IODINE MONOCHLORIDE TO ALKYNAMINE HYDROCHLORIDES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Note ID ALKYNES C1 OAK RIDGE NATL LAB,NUCL MED GRP,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT RADIOL,KNOXVILLE,TN 37996. NR 21 TC 2 Z9 2 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 MAY 24 PY 1991 VL 56 IS 11 BP 3707 EP 3711 DI 10.1021/jo00011a048 PG 5 WC Chemistry, Organic SC Chemistry GA FN573 UT WOS:A1991FN57300048 ER PT J AU BRYAN, RP OLBRIGHT, GR CHENG, J AF BRYAN, RP OLBRIGHT, GR CHENG, J TI CASCADABLE SURFACE-EMITTING LASER LOGIC - DEMONSTRATION OF BOOLEAN LOGIC SO ELECTRONICS LETTERS LA English DT Article DE LOGIC DEVICES; OPTICAL LOGIC AB We demonstrate cascadable optical logic (AND- OR- and exclusive OR-gates) implemented with heterojunction phototransistors and vertical-cavity surface-emitting lasers. We also discuss an architecture for implementing binary arithmetic using cascadable surface-emitting laser logic devices and optical symbolic substitution. C1 UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. RP BRYAN, RP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 19 Z9 19 U1 0 U2 2 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAY 23 PY 1991 VL 27 IS 11 BP 893 EP 894 DI 10.1049/el:19910559 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA FQ425 UT WOS:A1991FQ42500001 ER PT J AU HSU, SDH AF HSU, SDH TI VACUUM TUNNELING VIA PARTICLE COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID METASTABLE VACUUM; AMPLITUDES; ENERGY AB We investigate whether vacuum tunneling can be catalyzed by high energy particle collisions. In a scalar field theory which exhibits nondegenerate vacua, we show that the instanton mediated cross section for inclusive scalar-scalar scattering in the false vacuum grows exponentially with center of mass energy E2/3. We also show that the cross section for producing a true vacuum bubble grows with energy. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP HSU, SDH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 15 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 23 PY 1991 VL 261 IS 1-2 BP 81 EP 88 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FR366 UT WOS:A1991FR36600016 ER PT J AU FOOT, R HERNANDEZ, OF RIZZO, TG AF FOOT, R HERNANDEZ, OF RIZZO, TG TI SU(5)C COLOR MODEL CONSTRAINTS FROM UA2 SO PHYSICS LETTERS B LA English DT Article AB We investigate the possibility that the color gauge group SU(3) may arise as a consequence of the spontaneous symmetry breaking of SU(5)c. In an earlier paper we examine the constraints imposed on the SU(5)c color model by recent measurements of the dijet mass distribution at CDF. We found that the CDF data did not exclude any region of parameter space in the model. Here we consider similar data from UA2 and find that it leads to the constraint M(z) greater-than-or-similar-to 280 GeV. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP FOOT, R (reprint author), UNIV SOUTHAMPTON,DEPT PHYS,HIGHFIELD,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. NR 5 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 23 PY 1991 VL 261 IS 1-2 BP 153 EP 154 DI 10.1016/0370-2693(91)91342-S PG 2 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FR366 UT WOS:A1991FR36600029 ER PT J AU BULL, C NIEDERHOFFER, EC YOSHIDA, T FEE, JA AF BULL, C NIEDERHOFFER, EC YOSHIDA, T FEE, JA TI KINETIC-STUDIES OF SUPEROXIDE DISMUTASES - PROPERTIES OF THE MANGANESE-CONTAINING PROTEIN FROM THERMUS-THERMOPHILUS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID METAL-DIOXYGEN COMPLEXES; ESCHERICHIA-COLI; PULSE-RADIOLYSIS; BACILLUS-STEAROTHERMOPHILUS; SATURATION BEHAVIOR; IRON; RESOLUTION; MECHANISM; PORPHYRIN; SPECTRA AB The catalysis of superoxide dismutation (2O2- + 2H+ --> H2O2 + O2) by manganese superoxide dismutase (MnSOD) from Thermus Thermophilus was examined by stopped-flow spectrophotometry. As found earlier by McAdam et al. [McAdam, M.E.; Fox, R.A.; Lavelle, F.; Fielden, E.M. Biochem J. 1977, 165, 81-87], decay curves of O2- in the presence of MnSOD from Bacillus Stearothermophilus are characterized by three distinct phases: rapid disappearance of O2- (the ''burst'' phase), a period of approximately zero-order disappearance of O2- (the ''steady-state'' phase), and a very rapid depletion of O2- toward the end of the reaction. The enzyme from T. Thermophilus shows a similar kinetic pattern, and our data provide a chemical explanation for this behavior: The molar consumption of O2- in the burst phase is ([O2-]B/[Mn]T) approximately 80. The magnitude of the burst is decreased approximately 2.5-fold in D2O, whereas the zero-order phase is the same in both solvent. This indicates that proton transfer is probably the rate-limiting step when the enzyme is saturated with O2- and that the reaction by which inactive enzyme returns to active enzyme is not limited by proton transfer. At low temperatures (2-6-degrees-C) in D2O, the overall reaction was sufficiently slow to allow observation of spectral changes associated with the metal chromophore during the steady state, and we were able to obtain an absorption spectrum of the enzyme during this period. This was assigned to the inactive form of the enzyme and is characterized by a band near 650 nm (epsilon approximately 230 [Mn]-1 cm-1) and a band near 410 nm (epsilon approximately 700 [Mn]-1 cm-1). We speculate that inactivation of the enzyme occurs by oxidative addition of O2- to Mn(II), within a Michaelis complex, forming a cyclic peroxo complex of Mn(III) with the reverse of this reaction yielding active enzyme. C1 LOS ALAMOS NATL LAB,STABLE ISOTOPE RESOURCE ISOTOPE & STRUCT CHEM GRP,INC-4,LOS ALAMOS,NM 87545. UNIV MICHIGAN,DIV BIOPHYS RES,ANN ARBOR,MI 48109. NR 34 TC 116 Z9 116 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 22 PY 1991 VL 113 IS 11 BP 4069 EP 4076 DI 10.1021/ja00011a003 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA FN005 UT WOS:A1991FN00500003 ER PT J AU SHELNUTT, JA MEDFORTH, CJ BERBER, MD BARKIGIA, KM SMITH, KM AF SHELNUTT, JA MEDFORTH, CJ BERBER, MD BARKIGIA, KM SMITH, KM TI RELATIONSHIPS BETWEEN STRUCTURAL PARAMETERS AND RAMAN FREQUENCIES FOR SOME PLANAR AND NONPLANAR NICKEL(II) PORPHYRINS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTER; PROTOPORPHYRIN RECONSTITUTED MYOGLOBIN; TRANSIENT PHOTOLIGATION BEHAVIOR; LIGHT-ABSORPTION PROPERTIES; MOLECULAR STEREOCHEMISTRY; CRYSTAL-STRUCTURE; RHODOPSEUDOMONAS-VIRIDIS; DIFFERENCE SPECTROSCOPY; ELECTRONIC-STRUCTURE; CORE EXPANSION AB Molecular mechanics calculations, based on a force field derived from a previously published normal coordinate analysis for NiOEP (1) and the X-ray structure of NiOEP B triclinic form, have been used to predict the structures of NiTPP (2), NiP(3), and several recently synthesized nickel porphyrins which bear alkyl or phenyl groups at all 12 peripheral positions (4-10). These calculations predict that porphyrins 4 (NiOMTPP),5 (NiOETPP), 6 (NiOPTPP), 7 (NiDPP),9 (NiTC6TPP), and 10 (NiTC7TPP) adopt a saddle conformation with varying degrees of nonplanarity of the macrocycle. To evaluate the accuracy of these calculations, a single-crystal X-ray structure of the porphyrin with the most nonplanar calculated structure (NiOPTPP) was determined. The agreement between observed and calculated structures is good, both in terms of the general molecular conformation and more subtle structural differences such as a decrease in core size and increase in the C-alpha-NC-alpha bond angle compared to planar nickel porphyrins. The structural parameters obtained from these calculations were then used to investigate the relationship between core size and the frequency of the structure-sensitive Raman lines (nu-4, nu-3, nu-2, and nu-19). The linear relationship between core size and Raman frequency has a positive slope, in contrast to the negative slope exhibited by the usual core size-Raman frequency relationship. Thus it is not the core size that determines the frequencies of the structure-sensitive Raman lines. On the other hand, the linear correlation between the C-alpha-NC-alpha angle and Raman frequency has a negative slope for both the nickel porphyrins used in this study and the metalloporphyrins of the conventional core-size relationship, suggesting a more direct relationship between this angle and the marker line frequencies. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP SHELNUTT, JA (reprint author), SANDIA NATL LABS,DIV FUEL SCI 6211,ALBUQUERQUE,NM 87185, USA. RI Shelnutt, John/A-9987-2009; Medforth, Craig/D-8210-2013; REQUIMTE, FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Medforth, Craig/0000-0003-3046-4909; Smith, Kevin/0000-0002-6736-4779 NR 68 TC 303 Z9 306 U1 1 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 22 PY 1991 VL 113 IS 11 BP 4077 EP 4087 DI 10.1021/ja00011a004 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA FN005 UT WOS:A1991FN00500004 ER PT J AU JELINEK, R CHMELKA, BF WU, Y GRANDINETTI, PJ PINES, A BARRIE, PJ KLINOWSKI, J AF JELINEK, R CHMELKA, BF WU, Y GRANDINETTI, PJ PINES, A BARRIE, PJ KLINOWSKI, J TI STUDY OF THE ALUMINOPHOSPHATES ALPO4-21 AND ALPO4-25 BY AL-27 DOUBLE-ROTATION NMR SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SOLID-STATE NMR; DOUBLE-ROTOR; ANGLE; NUCLEI AB Aluminum-27 double-rotation NMR in a magnetic field of 11.7 T distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor ALPO4(-21). Upon calcination, ALPO4(-21) transforms to ALPO4(-25), which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7 T field. The two tetrahedral environments, however, have a different quadrupole coupling constants and are distinguished by double rotation at 4.2 T field. The quadrupole coupling constants obtained for these sites indicates that the tetrahedral aluminum environments are less distorted in the hydrated material. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. UNIV CAMBRIDGE,DEPT CHEM,CAMBRIDGE CB2 1EW,ENGLAND. RI Grandinetti, Philip/F-1084-2010; OI Grandinetti, Philip/0000-0003-0102-316X; jelinek, raz/0000-0002-0336-1384 NR 16 TC 58 Z9 58 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 22 PY 1991 VL 113 IS 11 BP 4097 EP 4101 DI 10.1021/ja00011a007 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA FN005 UT WOS:A1991FN00500007 ER PT J AU ZEMVA, B LUTAR, K JESIH, A CASTEEL, WJ WILKINSON, AP COX, DE VONDREELE, RB BORRMANN, H BARTLETT, N AF ZEMVA, B LUTAR, K JESIH, A CASTEEL, WJ WILKINSON, AP COX, DE VONDREELE, RB BORRMANN, H BARTLETT, N TI SILVER TRIFLUORIDE - PREPARATION, CRYSTAL-STRUCTURE, SOME PROPERTIES, AND COMPARISON WITH AUF3 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID FLUORIDES; COMPLEXES; XENON; AGF3; GOLD AB Red, diamagnetic AgF3 is precipitated from anhydrous hydrogen fluoride (AHF) solutions of AgF4- salts by addition of fluoro acids (L) such as BF3, PF5, or AsF5: AgF4- + L --> AgF3 + LF-. With additional AsF5, silver(III) is reduced: AgF3 + AsF5 --> AgFAsF6 + 1/2 F2. Such reduction does not occur with BF3, and the latter acid is therefore preferred for the preparation of stoichiometric AgF3. AgF3 is thermodynamically unstable and, in contact with AHF, at approximately 20-degrees-C, loses F2 in less than 19 h according to the equation 3AgF3 --> Ag3F8 + 1/2F2. The trifluoride is isostructural with AuF3. To provide for meaningful comparisons, the structure of AuF3 was redetermined. AgF3 and AuF3 were successfully refined in space group P6(1)22-D62 (No. 178) by using the Rietveld method from time-of-flight neutron powder diffraction data from 100-mg samples contained in 2-mm capillary tubes. The 7762 observations for AgF3 yielded a = 5.0782 (2) angstrom, c = 15.4524 (8) angstrom, and V = 345.10 (2) angstrom-3, the reliability parameters for the structure being R(wp) = 6.21 and R(p) = 3.83%. From the 7646 observations for AuF3, a = 5.1508 (1) angstrom, c = 16.2637 (7) angstrom, V = 373.68 (2) angstrom-3, and R(wp) = 11.21 and R(p) = 7.58%. The silver or gold atom lies at the center of an elongated octahedron with two Ag-F(1) = 1.990 (3) angstrom, two Au-F(1) = 1.998 (2) angstrom, two Ag-F(2) = 1.863 (4) angstrom, and two Au-F(2) = 1.868 (3) angstrom, the approximately square, isodimensional AF4 units being joined by symmetrical mu-fluoro bridges (two F(1) in cis relationship in the AF4 unit) to form the 6(1) (or 6(5)) helical chains where Ag-F(1)-Ag = 123.2 (2)-degrees and Au-F(1)-Au = 119.3 (2)-degrees. The approximately 5-angstrom-3 smaller formula unit volume of AgF3 compared with AuF3 and the and the shorter z axis interatomic distance (Ag-F = 2.540 (4), Au-F = 2.756 (8) angstrom) are in accord with the tighter binding of the Ag(III) d-orbital electrons evident in the strong oxidizing properties of Ag(III). Interaction of AgF+ with AgF4- (1:1) in AHF yields maroon Ag(II)Ag(III)F5. The latter interacts with AgF3 to yield Ag(II)Ag(III)2F8, which is identical with the product of the decomposition of AgF3 at 20-degrees-C in AHF and with the material previously described1,2 as AgF3. The magnetic susceptibility for Ag(II)Ag(III)2F8 obeys the Curie-Weiss law (4-280 K) with theta = -4.2 (5)-degrees and mu-eff = 1.924 (3)-mu-B. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. UNIV OXFORD,DEPT CHEM CRYSTALLOG,OXFORD OX1 3PD,ENGLAND. UNIV LJUBLJANA,INST JOZEF STEFAN,YU-61000 LJUBLJANA,SLOVENIA. LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RI Wilkinson, Angus/C-3408-2008; Jesih, Adolf/A-1831-2008 OI Wilkinson, Angus/0000-0003-2904-400X; NR 26 TC 63 Z9 63 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 22 PY 1991 VL 113 IS 11 BP 4192 EP 4198 DI 10.1021/ja00011a021 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA FN005 UT WOS:A1991FN00500021 ER PT J AU WERST, DW AF WERST, DW TI RADICAL CATION ARENE PI-MOLECULAR COMPLEXES - THIOETHER RADICAL CATIONS IN AROMATIC SOLVENTS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID ELECTRON-SPIN-RESONANCE; ORGANIC SULFIDES; PHOTOCHLORINATION; DISULFIDES; CHLORINE RP WERST, DW (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 21 TC 11 Z9 11 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 22 PY 1991 VL 113 IS 11 BP 4345 EP 4346 DI 10.1021/ja00011a056 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA FN005 UT WOS:A1991FN00500056 ER PT J AU FAY, SP POSNER, RG SWANN, WN SKLAR, LA AF FAY, SP POSNER, RG SWANN, WN SKLAR, LA TI REAL-TIME ANALYSIS OF THE ASSEMBLY OF LIGAND, RECEPTOR, AND G PROTEIN BY QUANTITATIVE FLUORESCENCE FLOW-CYTOMETRY SO BIOCHEMISTRY LA English DT Article ID FORMYL PEPTIDE RECEPTOR; TERNARY COMPLEX MODEL; ADENYLATE-CYCLASE; HUMAN-NEUTROPHILS; ADRENERGIC-RECEPTORS; ANTAGONIST BINDING; PERTUSSIS TOXIN; DYNAMICS; AGONIST; DISSOCIATION AB We describe a general approach for the quantitative analysis of the interaction among fluorescent peptide ligands (L), receptors (R), and G proteins (G) using fluorescence flow cytometry. The scheme depends upon the use of commercially available fluorescent microbeads as standards to calibrate the concentration of fluorescent peptides in solution and the receptor number on cells in suspension. We have characterized a family of fluoresceinated formyl peptides and analyzed both steady-state and dynamic aspects of ligand formyl peptide-receptor interactions in digitonin-permeabilized human neutrophils. Detailed receptor-binding studies were performed with the pentapeptide N-formyl-Met-Leu-Phe-Phe-Lys-fluorescein. Equilibrium studies showed that GTP[S] caused a loss of binding affinity of approximately two orders of magnitude, from approximately 0.04 nM (LRG) to approximately 3 nM (LR), respectively. Kinetic studies revealed that this change in affinity was principally due to an increase in the dissociation rate constants from approximately 1 X 10(-3) s-1 (LRG) to approximately 1 X 10(-1) s-1 (LR). In contrast, the association rate constants in the presence and absence of guanine nucleotide (approximately 3 X 10(7) s-1 M-1) were statistically indistinguishable and close to the diffusion limit. In the presence of guanine nucleotide (LR), the kinetic data were adequately fit by a single-step reversible-binding model. In the absence of guanine nucleotides, not all receptors have rapid access to G to form the LRG ternary complex. Mathematically, those R that have rapid access to G are either precoupled to R or the association of G with R is fast compared to the association of L with R. The physiological consequences of coupling heterogeneity are discussed. C1 UNIV NEW MEXICO, SCH MED, ALBUQUERQUE, NM 87131 USA. UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. FU NCRR NIH HHS [RR01315]; NIAID NIH HHS [AII9032] NR 31 TC 91 Z9 92 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 21 PY 1991 VL 30 IS 20 BP 5066 EP 5075 DI 10.1021/bi00234a033 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FM712 UT WOS:A1991FM71200033 PM 1645188 ER PT J AU BRUBAKER, ME MATTSON, JE SOWERS, CH BADER, SD AF BRUBAKER, ME MATTSON, JE SOWERS, CH BADER, SD TI OSCILLATORY INTERLAYER MAGNETIC COUPLING OF SPUTTERED FE/MO SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID ENHANCED MAGNETORESISTANCE; GIANT MAGNETORESISTANCE; MULTILAYERED STRUCTURES; FE LAYERS; CR; EXCHANGE; FE/CR AB Sputtered Fe/Mo superlattices grown on sapphire exhibit an oscillatory magnetic coupling as a function of Mo thickness. Ferromagnetic Fe layers 25 angstrom thick couple across the nonmagnetic Mo layers ferro- or antiferromagnetically with a period of approximately 11 angstrom Mo. Ferromagnetically aligned films show the anticipated trend in longitudinal Kerr-rotation values based on calculation, while the antiferromagnetically coupled films in zero field yield only weak Kerr signals due to their characteristically "pinched" hysteresis loops. The films are well ordered and exhibit up to seven low-angle, x-ray diffraction peaks, but have negative magnetoresistive anomalies that are only less-than-or-similar-to 2% at 4.2 K. RP BRUBAKER, ME (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 23 TC 58 Z9 58 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 20 PY 1991 VL 58 IS 20 BP 2306 EP 2308 DI 10.1063/1.104907 PG 3 WC Physics, Applied SC Physics GA FM039 UT WOS:A1991FM03900039 ER PT J AU BOYD, RN FENCL, HS AF BOYD, RN FENCL, HS TI PHOTOEROSION AND THE ABUNDANCES OF LI-7, BE-9, B-10, AND B-11 NEAR ACTIVE GALACTIC NUCLEI SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ABUNDANCES; GALAXIES, NUCLEI; NUCLEAR REACTIONS; STARS, ABUNDANCES ID PRIMORDIAL NUCLEOSYNTHESIS; LIGHT-ELEMENTS; CROSS-SECTIONS; UNIVERSE; ISOTOPES; LITHIUM AB Photoerosion, a shifting of nuclear abundances from higher to lower mass which results from interactions between high-energy photons and nuclei, is shown to be capable of producing copious amounts of Li-7, Be-9, B-10, and B-11 in some environments, most notably those associated with an active galactic nucleus. If even a small amount of these nuclides could be admixed with the rest of the galaxy, or with the galactic halo, it would greatly enhance their abundances therein. The abundance signatures of these nuclides are different from those resulting from some other processes which have been suggested for their production, thereby allowing discrimination of the products of photoerosion from at least some of the other potential production processes. C1 OHIO STATE UNIV,DEPT ASTRON,COLUMBUS,OH 43210. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV PHYS,LIVERMORE,CA 94550. RP BOYD, RN (reprint author), OHIO STATE UNIV,DEPT PHYS,174 W 18TH AVE,COLUMBUS,OH 43210, USA. NR 34 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 20 PY 1991 VL 373 IS 1 BP 84 EP 88 DI 10.1086/170026 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FK917 UT WOS:A1991FK91700009 ER PT J AU HOWARD, WM MEYER, BS WOOSLEY, SE AF HOWARD, WM MEYER, BS WOOSLEY, SE TI A NEW SITE FOR THE ASTROPHYSICAL GAMMA-PROCESS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ABUNDANCES; NUCLEAR REACTIONS; STARS, SUPERNOVAE ID S-PROCESS; SOLAR-SYSTEM; I SUPERNOVAE; MODELS; NUCLEOSYNTHESIS; PHYSICS; STARS AB A leading model for the origin of rare proton-rich isotopes (p-isotopes) involves the transmutation of heavy elements into lighter p-isotopes via a series of (gamma, n), (gamma, p) and (gamma, alpha) reactions. Such a model, called the gamma-process, is quite successful in reproducing the abundance pattern of many rare p-isotopes if one assumes that a distribution of near-solar seeds is exposed to the thermodynamic conditions that occur naturally in the neon-oxygen layers of massive stars (M > 10-12 M.) experiencing Type II supernova explosions. However, a failure of this model is the inability to reproduce the abundance pattern of the light p-isotopes 78Kr, Mo-92, Mo-94, Ru-96, and Ru-98 due to a lack of sufficient seeds with A greater-than-or-equal-to 96. We propose that the requisite thermodynamic conditions may also occur in Type Ia or certain subclasses of Type II supernovae, where a carbon-oxygen white dwarf explodes by deflagration or detonation. For such cases, the abundance pattern of all p-nuclei, including the light p-nuclei, is well reproduced. We also note the production of several possible p-isotope cosmochronometers Mn-53 (tau-1/2: 3.7 x 10(6) yr), Nb-92 (tau-1/2: 36. x 10(6) yr), Tc-97 (tau-1/2: 2.6 x 10(6) yr) and Sm-146 (tau-1/2: 103. x 10(6) yr). C1 UNIV CALIF SANTA CRUZ,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. RP HOWARD, WM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-297,LIVERMORE,CA 94550, USA. NR 36 TC 124 Z9 124 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 20 PY 1991 VL 373 IS 1 BP L5 EP L8 DI 10.1086/186038 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FK918 UT WOS:A1991FK91800002 ER PT J AU ELLINGSON, RG ELLIS, J FELS, S AF ELLINGSON, RG ELLIS, J FELS, S TI THE INTERCOMPARISON OF RADIATION CODES USED IN CLIMATE MODELS - LONG-WAVE RESULTS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CONTINUUM ABSORPTION; COOLING RATES; WATER-VAPOR; CO2; PARAMETERIZATION; REGION AB An international program of intercomparison of radiation codes used in climate models has been initiated because of the central role of radiative processes in many proposed climate change mechanisms. During the past 6 years, results of calculations from such radiation codes have been compared with each other, with results from the most detailed radiation models (line-by-line models) and with observations from within the atmosphere. Line-by-line model results tend to agree with each other to within 1%; however, the intercomparison shows a spread of 10-20% in the calculations of radiation budget components by the less detailed climate model codes. The spread among the results is even larger (30-40%) for the sensitivities of the codes to changes in radiatively important variables, such as carbon dioxide and water vapor. The analysis of the model calculations shows that the outliers to many of the clear-sky calculations appear to be related to those models that have not tested the techniques used to perform the integration over altitude. When those outliers are removed, the agreement between narrow band models and the line-by-line models is about +/- 2% for fluxes at the atmospheric boundaries, about +/- 5% for the flux divergence for the troposphere, and to about +/- 5% for the change of the net flux at the tropopause as CO2 doubles. However, this good agreement does not extend to the majority of the models currently used in climate models. The lack of highly accurate flux observations from within the atmosphere has made it necessary to rely on line-by-line model results for evaluating model accuracy. As the intercomparison project has proceeded, the number of models agreeing more closely with the line-by-line results has increased as the understanding of the various parameterizations has improved and as coding errors have been discovered. The most recent results indicate that several climate model techniques are in the marginal range of (relative) accuracy for longwave flux calculations for many climate programs. However, not all such models will give such accuracy. It is recommended that a code not be accepted to provide such accuracy until it has made comparisons to the line-by-line results of this study. The data necessary to make such comparisons are included herein. However, uncertainties in the physics of line wings and in the proper treatment of the water vapor continuum make it impossible for the line-by-line models to provide an absolute reference for evaluating less-detailed model calculations. A dedicated field measurement program is recommended for the purpose of obtaining accurate spectral radiance rather than integrated fluxes as a basis for evaluating model performance. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP ELLINGSON, RG (reprint author), UNIV MARYLAND, DEPT METEOROL, 2213 COMP & SPACE SCI BLDG, COLLEGE PK, MD 20742 USA. NR 40 TC 240 Z9 248 U1 0 U2 4 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 MAY 20 PY 1991 VL 96 IS D5 BP 8929 EP 8953 DI 10.1029/90JD01450 PG 25 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FN179 UT WOS:A1991FN17900003 ER PT J AU COVEY, C TAYLOR, KE DICKINSON, RE AF COVEY, C TAYLOR, KE DICKINSON, RE TI UPPER LIMIT FOR SEA ICE ALBEDO FEEDBACK CONTRIBUTION TO GLOBAL WARMING SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID RADIATION BUDGET EXPERIMENT; CLIMATE SENSITIVITY; MODEL; EARTH AB Two versions of the National Center for Atmospheric Research Community Climate Model (CCM) are used to calculate the increase in solar energy absorbed by the Earth-atmosphere system if all sea ice on the planet were to melt. The increase in solar energy is determined at several time points in the seasonal cycle by brief integrations of the models with the surface albedo of sea ice changed to that of open ocean; temperature, cloudiness, and other climate parameters are unchanged during the short integrations, so that our results isolate the climatic effect of sea ice albedo changes in the absence of other processes and feedbacks. (In particular, we do not include the effects of removing the insulation between ocean underneath sea ice and the atmosphere above it.) We find that the globally and annually averaged enhancement of absorbed solar flux due to removal of sea ice is 2-3 W m-2; a simple calculation indicates that most of the difference between model versions is due to differences in the surface albedo of sea ice. About half the albedo reduction at the surface is masked at the top of the atmosphere by clouds, even though the CCM versions we use tend to underestimate cloudiness. Our upper limit is significant compared to the direct radiative forcing of a doubling of atmospheric carbon dioxide, but it suggests that for greenhouse gas warming equivalent to doubling of CO2 or greater, the sea ice albedo feedback is likely to be smaller than from water vapor and potentially that from clouds. C1 NATL CTR ATMOSPHER RES, BOULDER, CO 80307 USA. RP COVEY, C (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB, DIV ATMOSPHER & GEOPHYS SCI, POB 808, MAIL CODE L-264, LIVERMORE, CA 94551 USA. RI Taylor, Karl/F-7290-2011 OI Taylor, Karl/0000-0002-6491-2135 NR 20 TC 17 Z9 17 U1 0 U2 4 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 MAY 20 PY 1991 VL 96 IS D5 BP 9169 EP 9174 DI 10.1029/91JD00236 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FN179 UT WOS:A1991FN17900018 ER PT J AU APPEL, R BARTON, DS BUNCE, G CARROLL, AS COURANT, H FANG, G GUSHUE, S HELLER, KJ MAKDISI, YI MARSHAK, ML RUSSELL, JJ SHUPE, MA WHITE, C WU, JY AF APPEL, R BARTON, DS BUNCE, G CARROLL, AS COURANT, H FANG, G GUSHUE, S HELLER, KJ MAKDISI, YI MARSHAK, ML RUSSELL, JJ SHUPE, MA WHITE, C WU, JY TI HARD EXCLUSIVE HADRON NUCLEON-SCATTERING AND COLOR TRANSPARENCY SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID MOMENTUM AB We present preliminary results on the measurement of a variety of exclusive hadron interactions at center of mass scattering angles of 90-degrees. Data are also presented which show the relative transparency of nuclei to pi-p and pp elastic scattering in this kinematic range. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. SE MASSACHUSETTS UNIV,N DARTMOUTH,MA 02747. RP APPEL, R (reprint author), PENN STATE UNIV,UNIVERSITY PK,PA 16802, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C581 EP C583 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700060 ER PT J AU ATIYA, MS CHIANG, IH FRANK, JS HAGGERTY, JS ITO, MM KYCIA, TF LI, KK LITTENBERG, LS STEVENS, AJ STRAND, RC LOUIS, WC AKERIB, DS MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS AZUELOS, G BLACKMORE, EW BRYMAN, DA FELAWKA, L KITCHING, PR KUNO, Y MACDONALD, JA NUMAO, T PADLEY, BP POUTISSOU, JM POUTISSOU, R ROY, J AF ATIYA, MS CHIANG, IH FRANK, JS HAGGERTY, JS ITO, MM KYCIA, TF LI, KK LITTENBERG, LS STEVENS, AJ STRAND, RC LOUIS, WC AKERIB, DS MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS AZUELOS, G BLACKMORE, EW BRYMAN, DA FELAWKA, L KITCHING, PR KUNO, Y MACDONALD, JA NUMAO, T PADLEY, BP POUTISSOU, JM POUTISSOU, R ROY, J TI A SEARCH FOR K+-]PI+NU-NU-BAR AND OTHER RARE K+ DECAYS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID STANDARD MODEL; BOSON; LIGHT C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. PRINCETON UNIV,PRINCETON,NJ 08544. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. RP ATIYA, MS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Marlow, Daniel/C-9132-2014 NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C727 EP C729 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700088 ER PT J AU BEIER, EW DAVIS, R KIM, SB ELLIOTT, SR JELLEY, N AF BEIER, EW DAVIS, R KIM, SB ELLIOTT, SR JELLEY, N TI STATUS OF SOLAR NEUTRINO EXPERIMENTS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID OSCILLATIONS; MATTER AB A summary of the status of four solar neutrino experiments is presented. The Homestake Cl-37 data are presented and the possible time dependence of the data is addressed. Data from 1040 days of operation of the Kamiokande II detector are presented next. The status of the Ga-71 experiment in the Baksan Neutrino Observatory, which has operated for a short time, is discussed. The summary concludes with a discussion of the status of the Sudbury Neutrino Observatory, which has been under construction since the beginning of 1990. C1 UNIV PENN,DEPT ASTRON,PHILADELPHIA,PA 19104. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3NP,ENGLAND. RP BEIER, EW (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Kim, Soo-Bong/B-7061-2014 NR 14 TC 1 Z9 1 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 MAY 20 PY 1991 VL 527 BP C653 EP C662 PG 10 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700075 ER PT J AU BITAR, KM DEGRAND, TA EDWARDS, R GOTTLIEB, S HELLER, U KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL ROSSI, P SINCLAIR, DK SUGAR, RL TEPER, M TOUSSAINT, D WANG, KC AF BITAR, KM DEGRAND, TA EDWARDS, R GOTTLIEB, S HELLER, U KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL ROSSI, P SINCLAIR, DK SUGAR, RL TEPER, M TOUSSAINT, D WANG, KC TI LATTICE SPECTRUM WITH DYNAMIC STAGGERED QUARKS AT 6/G2 = 5.6 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID GLUEBALL; SCALAR AB Under the DOE Grand Challenge program, we have calculated the hadron spectrum of QCD with two flavors of dynamical quarks. We set 6/g2 = 5.6 and use bare quark masses am(q) = 0.025 and 0.01 to generate gauge configurations. The spectrum is calculated using both staggered and Wilson valence quarks. There are several positive features when these results are compared to those with large lattice spacing; however, the nucleon to rho mass ratio is still too large. C1 UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. ARGONNE NATL LAB,DIV HEP,ARGONNE,IL 60439. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV OXFORD,DEPT THEORET PHYS,OXFORD OX1 3NP,ENGLAND. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. RP BITAR, KM (reprint author), FLORIDA STATE UNIV,SCRI,TALLAHASSEE,FL 32306, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C527 EP C529 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700049 ER PT J AU BLOOMER, MA LOVE, W WATERS, L AF BLOOMER, MA LOVE, W WATERS, L TI NEW RESULTS FROM AGS HEAVY-ION EXPERIMENTS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID COLLISIONS AB We review the most recent data from Experiments 802, 810 and 814 of the heavy-ion program at the Brookhaven Alternating Gradient Synchrotron (AGS). C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. SUNY STONY BROOK,STONY BROOK,NY 11794. RP BLOOMER, MA (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C595 EP C599 PG 5 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700063 ER PT J AU BOWLES, TJ AF BOWLES, TJ TI NEUTRINO PROPERTIES AND PUZZLES SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID BETA-SPECTRUM; COSMOLOGICAL RELEVANCE; PROMPT NEUTRINOS; MASS-DIFFERENCES; DECAY; OSCILLATIONS; TRITIUM; SN1987A; LIMITS; BURST AB Sixty years after the existence of the neutrino was first postulated, we are still lacking in information on the fundamental properties of neutrinos. Measurements have consistently pushed the limits on the mass, magnetic moment, and possible mixing down. Solar neutrino experiments are now shedding more light on the "solar neutrino problem" and are starting to give a hint that perhaps these quantities are nonzero. The present status of our knowledge of neutrino properties, the newest experimental data on the "solar neutrino problem", and future plans are presented. RP BOWLES, TJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 28 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C251 EP C263 PG 13 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700019 ER PT J AU CHANOWITZ, MS AF CHANOWITZ, MS TI THE MESON SPECTRUM BETWEEN 1 AND 2 GEV - GLUONIC STATES AND OTHER EXOTICA SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID FLUX-TUBE MODEL; 300 GEV/C; PSEUDOSCALAR RESONANCES; ETA-PI+PI; GLUEBALL; HADRONS; SYSTEM; QCD; PI; G(1590) AB Present understanding of the meson spectrum is reviewed, with special attention on the search for gluonic states. Experimental progress has resulted in several paradoxes indicating states outside the qBARq spectrum of the nonrelativistic quark model. RP CHANOWITZ, MS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 73 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C61 EP C72 PG 12 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700006 ER PT J AU CHRIEN, R AF CHRIEN, R TI STRANGE EXPERIMENTS AT THE AGS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT AB The purpose of this review is to report recent progress in nuclear experiments involving strangeness which have been carried out at the Brookhaven Alternating Gradient Synchrotron over the past three years. These recent developments are noted in three areas: 1) Few Body Systems and Dibaryons; 2) Strange Probes of the Nucleus; and 3) Associated Production of Hypernuclei. RP CHRIEN, R (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C465 EP C469 PG 5 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700040 ER PT J AU DOVER, CB AF DOVER, CB TI ANTIMATTER, STRANGENESS AND EXOTIC OBJECTS AT RHIC SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID HEAVY-ION COLLISIONS; DIBARYON AB We investigate the production of multiply strange composite objects and their antiparticles in collisions at the relativistic heavy ion collider RHIC. RP DOVER, CB (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C633 EP C635 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700071 ER PT J AU FULLER, GM MALANEY, RA AF FULLER, GM MALANEY, RA TI A PRIMORDIAL HE-4 CONSTRAINT ON DIRAC NEUTRINO MASSES SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID PHASE-TRANSITION; GAUGE-THEORY; NUCLEOSYNTHESIS; UNIVERSE; NUMBER; LIMIT AB The implications of the Z0-width experiment for the number of neutrino flavors taken together with the He-4 constraint on the energy density at the nucleosynthesis epoch, can give a limit on the extent to which a right-handed neutrino sea could contribute to the expansion rate of the universe during Big Bang nucleosynthesis. Since the population of the right-handed neutrino sea depends on the neutrino mass we can extract a Dirac neutrino mass limit of m(v) << 150 keV. This limit could apply to nu-mu or nu-tau if they have purely Dirac masses. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP FULLER, GM (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. RI Malaney, Robert/F-6588-2012 OI Malaney, Robert/0000-0001-9672-5601 NR 23 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C675 EP C678 PG 4 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700078 ER PT J AU GEESAMAN, DF AF GEESAMAN, DF TI NUCLEON PARTON DISTRIBUTIONS AND NUCLEAR-STRUCTURE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID INELASTIC MUON SCATTERING; HIGH STATISTICS MEASUREMENT; PROTON STRUCTURE FUNCTIONS; STRUCTURE FUNCTIONS F2N; HIGH Q2; SCALING VIOLATIONS; DEEP; DEUTERIUM; F2(X,Q2); IRON AB The current experimental status of measurement of nucleon structure functions in deep inelastic lepton scattering is presented. Recent BCDMS and SLAC results provide a consistent data set for charged lepton scattering. New probes of parton distributions: direct photons, Drell-Yan di-muon production, W, Z and heavy quark production are providing information on the gluon and antiquark distributions. The implications of these data on our understanding of the structure of the nucleon and the structure of the nucleon in the nucleus are discussed. RP GEESAMAN, DF (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 34 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C109 EP C121 PG 13 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700009 ER PT J AU GRAM, PAM AF GRAM, PAM TI MULTINUCLEON PHENOMENA IN PION-NUCLEUS REACTIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID DOUBLE-CHARGE-EXCHANGE; ABSORPTION; HE-4 RP GRAM, PAM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C45 EP C57 PG 13 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700005 ER PT J AU GYULASSY, M PLUMER, M AF GYULASSY, M PLUMER, M TI JET QUENCHING AS A PROBE OF DENSE MATTER SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID NUCLEUS-NUCLEUS COLLISIONS; QUARK AB We estimate the quenching of QCD hard jets in nuclear collisions at RHIC with particular emphasis on the consequences of a possible decrease in dE/dx at the critical point of the deconfinement phase transition. C1 UNIV MARBURG,DEPT PHYS,W-3550 MARBURG,GERMANY. RP GYULASSY, M (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 17 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C641 EP C644 PG 4 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700073 ER PT J AU HARTMANN, DH HAXTON, WC HOFFMAN, RD WOOSLEY, SE AF HARTMANN, DH HAXTON, WC HOFFMAN, RD WOOSLEY, SE TI NEUTRINO-INDUCED NUCLEOSYNTHESIS IN CORE-COLLAPSE SUPERNOVAE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID EQUATION; ORIGIN; SHOCK; STATE AB Almost all of the 3.10(53) ergs liberated in a core collapse supernova is radiated as neutrinos by the cooling neutron star. These neutrinos can excite nuclei in the mantle of the star by their neutral and charged current reactions. The resulting spallation reactions are an important nucleosynthesis mechanism that may be responsible for the galactic abundances of Li-7, B-11, F-19, La-138, Ta-180, and a number of other nuclei. C1 UNIV WASHINGTON,DEPT PHYS,NUCL THEORY GRP,SEATTLE,WA 98195. UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,MT HAMILTON,CA 95140. RP HARTMANN, DH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C663 EP C668 PG 6 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700076 ER PT J AU KINNEY, ER AF KINNEY, ER TI REALIZATIONS OF POLARIZED TARGETS IN STORAGE-RINGS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT AB While particle storage rings generally provide a large average current, they require ultra-thin targets in order to maintain a reasonable lifetime of the beam. Targets composed of polarized atomic gas are well-suited for use in storage rings because of their thinness and the high degree of purity and polarization possible. Several of these so-called internal targets have been developed and successfully used to measure scattering asymmetries at Novosibirsk; future experiments have been proposed at Bates, NIKHEF, and HERA, for example, which also rely on these techniques. The methods that have so far proved feasible for producing and storing highly polarized atoms will be reviewed. RP KINNEY, ER (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C827 EP C829 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700105 ER PT J AU LABS, JF AF LABS, JF TI RECENT RESULTS IN CHARM DECAYS FROM MARK-III SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT AB Measurements of D0 --> KBAR0-pi-0, KBAR0-eta and KBAR0-eta' are reported. Preliminary results of a search for the doubly Cabibbo-suppressed decays D+ --> K+pi-pi+ and K+pi-0 are also given. Both analyses used 9.3 +/- 0.47pb-1 of data collected near the psi-(3770) at SPEAR. RP LABS, JF (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C753 EP C754 PG 2 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700095 ER PT J AU LUDLAM, T ZEHNDER, A AF LUDLAM, T ZEHNDER, A TI DETECTORS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT C1 PAUL SHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RP LUDLAM, T (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C819 EP C819 PG 1 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700103 ER PT J AU MANDULA, JE KARLINER, M AF MANDULA, JE KARLINER, M TI STRANGER THAN GLUE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID DEPENDENT PARTON DISTRIBUTIONS; PROTON; SPIN; SCATTERING; G1 AB Experiment indicates that quarks carry only a small fraction of the proton's spin and that the strange quark sea in the proton is substantially polarized. An alternative explanation requires a large polarization of gluons in the proton. This explanation is strongly constrained by the existing experimental data and by a recent lattice calculation. The surprisingly small contribution of quarks to the proton spin requires a stranger explanation than anomalous gluons. C1 TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP MANDULA, JE (reprint author), US DOE,DIV HIGH ENERGY PHYS,WASHINGTON,DC 20545, USA. NR 20 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C589 EP C592 PG 4 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700062 ER PT J AU MCCLELLAND, J SOYEUR, M AF MCCLELLAND, J SOYEUR, M TI NUCLEON-NUCLEON AND NUCLEON-NUCLEUS INTERACTIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID CHARGE-EXCHANGE; POLARIZED BEAM; EXCITATION; COLLISIONS; STRENGTH; GEV/C C1 CENS,NATL SATURNE LAB,F-91191 GIF SUR YVETTE,FRANCE. RP MCCLELLAND, J (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MEDIUM ENERGY PHYS,MS H841,LOS ALAMOS,NM 87545, USA. NR 34 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C377 EP C391 PG 15 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700027 ER PT J AU MEYER, BS AF MEYER, BS TI COUPLED BARYON DIFFUSION AND NUCLEOSYNTHESIS IN THE EARLY UNIVERSE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID NEUTRON DIFFUSION; PRIMORDIAL NUCLEOSYNTHESIS AB Detailed calculations of big-bang nucleosynthesis in baryon-inhomogeneous universes show that OMEGA-b can be considerably larger than its limit from standard big-bang nucleosynthesis. Such results require that late-time hydrodynamic effects deplete overproduction of Li-7 and that the QCD surface tension be near the cube of the QCD coexistence temperature for fluctuations of the correct length scales to arise. RP MEYER, BS (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-413,LIVERMORE,CA 94550, USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C669 EP C673 PG 5 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700077 ER PT J AU MILLENER, DJ AF MILLENER, DJ TI PROGRESS AND OPEN PROBLEMS IN HYPERNUCLEAR STRUCTURE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID PHOTOPRODUCTION AB A hypernuclei exist as particle-stable systems with spectroscopies analogous to those of ordinary nuclei. The analysis of Brookhaven data on (pi+,K+) reactions, for selected targets up to A approximately 90, has yielded information on LAMBDA single-particle energies and thus the LAMBDA-nucleus mean field. Better energy resolution and higher intensity beams are needed to carry out coincidence experiments and detailed spectroscopic studies. The prospects for investigating hypernuclear structure at high-energy electron accelerator facilities via the (e,e'K) or (gamma,K) reactions, which are kinematically similar to the (pi+,K+) reaction, but which favor spin-flip transitions, are also considered. RP MILLENER, DJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C471 EP C475 PG 5 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700041 ER PT J AU MORRIS, CL AF MORRIS, CL TI NUCLEAR-STRUCTURE WITH PIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID GIANT QUADRUPOLE-RESONANCE; PARTICLE-HOLE STATES; LOW-LYING STATES; INELASTIC-SCATTERING; MATRIX-ELEMENTS; 2+ STATES; TRANSITIONS; EXCITATION; NEUTRON; PB-208 RP MORRIS, CL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 25 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C433 EP C441 PG 9 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700035 ER PT J AU MORSE, WM LEIPUNER, LB LARSEN, RC JASTRZEMBSKI, E ADAIR, RK GREENLEE, HB KASHA, H MANNELLI, EB OHL, KE SCHMIDT, MP VAGINS, MR SCHWARZ, CB AF MORSE, WM LEIPUNER, LB LARSEN, RC JASTRZEMBSKI, E ADAIR, RK GREENLEE, HB KASHA, H MANNELLI, EB OHL, KE SCHMIDT, MP VAGINS, MR SCHWARZ, CB TI SEARCH FOR THE DECAY KL0-]PI-0 E+E- SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID LIMIT AB Results are presented of a recent search by AGS Experiment 845 for the CP violating decay K(L)0 --> pi-0e+e-. The 90% C.L. limit B(K(L)0 --> pi-0e+e-) < 5.5 x 10(-9) was obtained. The background to the pi-0e+e- search, K(L)0e+e-gamma with an internal bremsstrahlung is discussed. C1 YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06511. RP MORSE, WM (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, 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 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C717 EP C720 PG 4 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700086 ER PT J AU ROCK, S AF ROCK, S TI PROTON AND NEUTRON STRUCTURE FUNCTIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID INELASTIC MUON SCATTERING; HIGH STATISTICS MEASUREMENT; HIGH Q2 AB New results on charged lepton scattering from hydrogen and deuterium targets by the BCDMS, NMC and SLAC collaborations have greatly increased our knowledge of the structure functions of protons and neutrons. The disagreement between the high energy muon scattering cross sections obtained by the EMC and BCDMS collaborations have been almost completely resolved by comparison with a global analysis of old and new SLAC data and a reanalysis of EMC data. We now have a consistent set of structure functions which covers an approximate range 1 less-than-or-equal-to Q2 less-than-or-equal-to 200(GeV/c)2 and 0.07 less-than-or-equal-to x less-than-or-equal-to 0.7. The ratio of neutron to proton structure functions decreases with increasing Q2 for values of x greater-than-or-equal-to 0.1. The difference between proton and neutron structure functions approaches zero as x decreases, consistent with the expected square-root-x behavior. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP ROCK, S (reprint author), AMERICAN UNIV,WASHINGTON,DC 20016, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C553 EP C557 PG 5 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700055 ER PT J AU SCHROEDER, LS AF SCHROEDER, LS TI DILEPTON (E+E-) PRODUCTION AT BEVALAC ENERGIES SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID P-BE COLLISIONS; DIELECTRON PRODUCTION; NUCLEUS COLLISIONS; MATTER AB The use of dilepton production in p-A and A-A collisions as a probe of nuclear matter under extreme conditions is described. Recent results from the DLS collaboration at the Bevalac are presented. RP SCHROEDER, LS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C625 EP C627 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700069 ER PT J AU SHURYAK, EV AF SHURYAK, EV TI PHYSICS OF CHIRAL SYMMETRY-BREAKING SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID JONA-LASINIO MODEL; INSTANTON LIQUID; QUANTITATIVE THEORY; QUANTUM CHROMODYNAMICS; DUAL QCD; QUARKS; NUCLEONS; FERMIONS; VACUUM; MESONS AB This subsection of the "Modeling QCD" Workshop has included five talks. E. Shuryak spoke on "Recent Progress in Understanding Chiral Symmetry Breaking"; below it is split into two parts: (i) a mini-review of the field and (ii) a brief presentation of the status of the theory of interacting instantons. The next sections correspond to the following talks: (iii) K. Goeke et al., "Chiral Restoration and Medium Corrections to Nucleon in the NJL Model"; (iv) M. Takizawa and K. Kubodera, "Study of Meson Properties and Quark Condensates in the NJL Model with Instanton Effects"; (v) G. Klein and A. G. Williams, "Dynamical Chiral Symmetry Breaking in Dual QCD"; and (vi) R. D. Ball, "Skyrmions and Baryons." RP SHURYAK, EV (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 40 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C513 EP C518 PG 6 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700047 ER PT J AU SORENSEN, SP AF SORENSEN, SP TI EXPERIMENTAL RESULTS FROM CERN ON REACTION-MECHANISMS IN HIGH-ENERGY HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID NUCLEUS-NUCLEUS COLLISIONS; HADRON-NUCLEUS; PROTON-NUCLEUS; MODEL; FLOW AB Three main experimental results from CERN concerning reaction mechanisms in high energy heavy ion collisions are discussed: 1) the striking validity of the single particle picture, 2) the nuclear stopping power and 3) the attained energy densities. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SORENSEN, SP (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C607 EP C609 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700065 ER PT J AU SZCZEPANIAK, A HENLEY, EM BRODSKY, SJ AF SZCZEPANIAK, A HENLEY, EM BRODSKY, SJ TI PERTURBATIVE QCD EFFECTS IN HEAVY MESON DECAYS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT AB The amplitude for the exclusive nonleptonic decay of a heavy meson into two light pseudoscalar mesons is analyzed using the factorization formalism of perturbative QCD for exclusive reactions at large momentum transfer. We calculate the form factor for b --> u transition and compare it to the old quark model calculation and the new one based on the light cone formulation of the full quark model wave function. The new results we obtain are smaller by a factor 2 - 3 as compared to the old value. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP SZCZEPANIAK, A (reprint author), UNIV WASHINGTON,DEPT PHYS,INST NUCL THEORY,FM-15,SEATTLE,WA 98195, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C757 EP C759 PG 3 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700097 ER PT J AU SZYMANSKI, JJ BOWMAN, CD BOWMAN, JD KNUDSON, J PENTTILA, S SEESTROM, SJ YUAN, VW BUSH, JE FRANKLE, CM GOULD, CR HAASE, DG MITCHELL, GE DELHEIJ, PPJ POSTMA, H ROBERSON, NR ZHU, X AF SZYMANSKI, JJ BOWMAN, CD BOWMAN, JD KNUDSON, J PENTTILA, S SEESTROM, SJ YUAN, VW BUSH, JE FRANKLE, CM GOULD, CR HAASE, DG MITCHELL, GE DELHEIJ, PPJ POSTMA, H ROBERSON, NR ZHU, X TI PARITY AND TIME-REVERSAL SYMMETRY NONCONSERVATION IN NEUTRON-NUCLEUS INTERACTIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID MANY-PARTICLE SPECTRA; STATISTICAL PROPERTIES; VIOLATION; LA-139 AB Parity non-conservation was studied for seventeen states in U-239 by measuring the helicity dependence of the p-wave resonance cross section for epithermal neutrons scattered from U-238. The root-mean-squared parity-violating matrix element for the mixing of p-wave and s-wave states was determined to be M = 0.58(-0.25)+0.50 meV. This corresponds to a parity-violating spreading width of GAMMA-PV 1.0 x 10(-7) eV. Under plausible assumptions this gives a value of 4 x 10(-7) for alpha-p, the ratio of strengths of the P-odd and P-even effective nucleon-nucleon interactions. The application of these techniques in studies of Time Reversal Symmetry is discussed. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. TRIANGLE UNIV NUCL LAB,DURHAM,NC 27706. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. DELFT UNIV TECHNOL,2600 GA DELFT,NETHERLANDS. RP SZYMANSKI, JJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Gould, Christopher/M-7676-2013 NR 19 TC 2 Z9 2 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 MAY 20 PY 1991 VL 527 BP C701 EP C706 PG 6 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700083 ER PT J AU TADDEUCCI, TN BYRD, RC CAREY, TA CISKOWSKI, DE GOODMAN, CD GULMEZ, E HUANG, W MARCHLENSKI, D MCCLELLAND, JB PROUT, D RAPAPORT, J RYBARCYK, LJ SAILOR, WC SUGARBAKER, E AF TADDEUCCI, TN BYRD, RC CAREY, TA CISKOWSKI, DE GOODMAN, CD GULMEZ, E HUANG, W MARCHLENSKI, D MCCLELLAND, JB PROUT, D RAPAPORT, J RYBARCYK, LJ SAILOR, WC SUGARBAKER, E TI CROSS-SECTION AND ANALYZING POWER FOR QUASI-FREE (P,N) REACTIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT ID INELASTIC-SCATTERING; INTERMEDIATE ENERGIES; POLARIZATION TRANSFER; PROTON-SCATTERING; EXCITATION C1 INDIANA UNIV,BLOOMINGTON,IN 47405. OHIO STATE UNIV,COLUMBUS,OH 43210. OHIO UNIV,ATHENS,OH 45701. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV COLORADO,BOULDER,CO 80309. UNIV TEXAS,AUSTIN,TX 78712. RP TADDEUCCI, TN (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Gulmez, Erhan/P-9518-2015 OI Gulmez, Erhan/0000-0002-6353-518X NR 16 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C393 EP C398 PG 6 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700028 ER PT J AU VUARIDEL, B KRISCH, AD RAYMOND, RS ROSER, T STEWART, JA GOODWIN, JE MEYER, HO MINTY, MG PANCELLA, PV POLLOCK, RE RINCKEL, T ROSS, MA SPERISEN, F STEPHENSON, EJ VONPRZEWOSKI, B COURANT, ED LEE, SY RATNER, LG AF VUARIDEL, B KRISCH, AD RAYMOND, RS ROSER, T STEWART, JA GOODWIN, JE MEYER, HO MINTY, MG PANCELLA, PV POLLOCK, RE RINCKEL, T ROSS, MA SPERISEN, F STEPHENSON, EJ VONPRZEWOSKI, B COURANT, ED LEE, SY RATNER, LG TI OVERCOMING DEPOLARIZING RESONANCES WITH A SIBERIAN SNAKE SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT C1 INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47408. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP VUARIDEL, B (reprint author), UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C835 EP C836 PG 2 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700107 ER PT J AU WARNOCK, RL AF WARNOCK, RL TI LONG-TERM BEHAVIOR OF PARTICLE ORBITS IN STORAGE-RINGS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON PARTICLES AND NUCLEI ( PANIC XII ) CY JUN 25-29, 1990 CL MIT, CAMBRIDGE, MA SP ARGONNE NATL LAB, BROOKHAVEN NATL LAB, LAWRENCE BERKELEY LAB, LOS ALAMOS NATL LAB, OAK RIDGE NATL LAB HO MIT RP WARNOCK, RL (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 20 PY 1991 VL 527 BP C831 EP C834 PG 4 WC Physics, Nuclear SC Physics GA FQ927 UT WOS:A1991FQ92700106 ER PT J AU CHANG, D KEUNG, WY LIU, J AF CHANG, D KEUNG, WY LIU, J TI THE ELECTRIC-DIPOLE MOMENT OF W-BOSON SO NUCLEAR PHYSICS B LA English DT Article ID LEFT-RIGHT SYMMETRY; NEUTRAL CURRENTS; CP-VIOLATION; PARITY AB Theoretical predictions of the electric dipole moment D(W) of the W gauge boson are estimated for various models of CP-violation. It is shown that, for the supersymmetric model and the Weinberg-Higgs model, D(W) can be of the order of 10(-20) e cm, which is close to the upper bound derived indirectly from the neutron electric dipole moment. We also obtain smaller D(W)-values of about 10(-22) e cm and less than 10(-38) e cm, predicted by the left-right model and the Kobayashi-Maskawa (KM) model, respectively. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109. RP CHANG, D (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60201, USA. NR 29 TC 31 Z9 31 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAY 20 PY 1991 VL 355 IS 2 BP 295 EP 304 DI 10.1016/0550-3213(91)90115-E PG 10 WC Physics, Particles & Fields SC Physics GA FJ820 UT WOS:A1991FJ82000002 ER PT J AU GIVEON, A PORRATI, M AF GIVEON, A PORRATI, M TI DUALITY INVARIANT STRING ALGEBRA AND D=4 EFFECTIVE ACTIONS SO NUCLEAR PHYSICS B LA English DT Article ID WARD IDENTITIES; N=4 SUPERGRAVITY; KALUZA-KLEIN; 4-DIMENSIONAL SUPERSTRINGS; DIMENSIONAL REDUCTION; MATTER COUPLINGS; FIELD-THEORY; YANG-MILLS; MODELS; ORBIFOLDS AB An infinite-dimensional gauge algebra (DISG) is defined in terms of string vertex operators. The DISG reproduce the gauge algebra of 4D, N = 4 compactifications of the heterotic string, and is invariant under the full internal duality group O(6, 22, Z). The DISG is an indefinite signature lattice algebra which contains affine Lie algebras of any level. It uniquely specifies the N = 4 low-energy effective lagrangian for gravitational and matter N = 4 multiplets. The gauge symmetries are broken on any background to a finite-dimensional gauge group. Orbifold truncations to N = 1, 2 are defined and studied for the case of Z(N) orbifolds. Inclusion of higher spin fields and the appearance of "duality forms" due to integration of massive fields are discussed. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP GIVEON, A (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 71 TC 35 Z9 35 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAY 20 PY 1991 VL 355 IS 2 BP 422 EP 454 DI 10.1016/0550-3213(91)90121-D PG 33 WC Physics, Particles & Fields SC Physics GA FJ820 UT WOS:A1991FJ82000008 ER PT J AU CASPER, D BECKERSZENDY, R BRATTON, CB CADY, DR CLAUS, R DYE, ST GAJEWSKI, W GOLDHABER, M HAINES, TJ HALVERSON, PG JONES, TW KIELCZEWSKA, D KROPP, WR LEARNED, JG LOSECCO, JM MCGREW, C MATSUNO, S MATTHEWS, J MUDAN, MS PRICE, L REINES, F SCHULTZ, J SINCLAIR, D SOBEL, HW STONE, JL SULAK, LR SVOBODA, R THORNTON, G VANDERVELDE, JC AF CASPER, D BECKERSZENDY, R BRATTON, CB CADY, DR CLAUS, R DYE, ST GAJEWSKI, W GOLDHABER, M HAINES, TJ HALVERSON, PG JONES, TW KIELCZEWSKA, D KROPP, WR LEARNED, JG LOSECCO, JM MCGREW, C MATSUNO, S MATTHEWS, J MUDAN, MS PRICE, L REINES, F SCHULTZ, J SINCLAIR, D SOBEL, HW STONE, JL SULAK, LR SVOBODA, R THORNTON, G VANDERVELDE, JC TI MEASUREMENT OF ATMOSPHERIC NEUTRINO COMPOSITION WITH THE IMB-3 DETECTOR SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLUX; SEARCH; DECAY AB The atmospheric neutrino flux is measured using a 3.4-kt yr exposure of the IMB-3 detector. Single-ring events are classified as showering or nonshowering using the geometry of the Cerenkov pattern. A simulation of neutrino interactions and three models of atmospheric neutrino production are used to predict the composition of the sample. Showering-nonshowering character is strongly correlated with the flavor of the neutrino parent. In the lepton momentum range p < 1500 MeV/c, we find that nonshowering events comprise [41 +/- 3(stat) +/- 2(syst)]% of the total. The fraction expected is [51 +/- 5(syst)]%. C1 UNIV MICHIGAN,ANN ARBOR,MI 48109. BROOKHAVEN NATL LAB,UPTON,NY 11973. BOSTON UNIV,BOSTON,MA 02215. UNIV HAWAII,HONOLULU,HI 96822. UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND. UNIV WARSAW,PL-00325 WARSAW,POLAND. CLEVELAND STATE UNIV,CLEVELAND,OH 44115. UNIV NOTRE DAME,NOTRE DAME,IN 46556. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. UNIV MARYLAND,COLLEGE PK,MD 20742. RP CASPER, D (reprint author), UNIV CALIF IRVINE,IRVINE,CA 92717, USA. RI Sobel, Henry/A-4369-2011; OI Matthews, James/0000-0002-1832-4420 NR 20 TC 416 Z9 416 U1 1 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 MAY 20 PY 1991 VL 66 IS 20 BP 2561 EP 2564 DI 10.1103/PhysRevLett.66.2561 PG 4 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600005 ER PT J AU PILE, PH BART, S CHRIEN, RE MILLENER, DJ SUTTER, RJ TSOUPAS, N PENG, JC MISHRA, CS HUNGERFORD, EV KISHIMOTO, T TANG, LG VONWITSCH, W XU, Z MAEDA, K GILL, D MCCRADY, R QUINN, B SEYDOUX, J SLEIGHT, JW STEARNS, RL PLENDL, H RAFATIAN, A REIDY, J AF PILE, PH BART, S CHRIEN, RE MILLENER, DJ SUTTER, RJ TSOUPAS, N PENG, JC MISHRA, CS HUNGERFORD, EV KISHIMOTO, T TANG, LG VONWITSCH, W XU, Z MAEDA, K GILL, D MCCRADY, R QUINN, B SEYDOUX, J SLEIGHT, JW STEARNS, RL PLENDL, H RAFATIAN, A REIDY, J TI STUDY OF HYPERNUCLEI BY ASSOCIATED PRODUCTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID 800 MEV/C; SCATTERING; CA AB Data obtained by the associated production of LAMBDA-hypernuclei through the (pi+, K+) reaction are presented for a wide range of mass numbers. The special features which make this reaction useful are pointed out. The reaction is shown to be an excellent probe of LAMBDA-single-particle states, as demonstrated by the excitation of deeply bound states which are interpreted as the weak coupling of a LAMBDA to neutron-hole states of the core. The LAMBDA-binding energies and ground-state production cross sections for LAMBDA-Be-9, LAMBDA-C-12, LAMBDA-O-16, LAMBDA-Si-28, LAMBDA-Ca-40, LAMBDA-V-51, and LAMBDA-Y-89 are presented. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV HOUSTON,HOUSTON,TX 77004. TOHOKU UNIV,SENDAI,MIYAGI 980,JAPAN. TRIUMF,VANCOUVER V5A 2A3,BC,CANADA. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. VASSAR COLL,POUGHKEEPSIE,NY 12601. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV MISSISSIPPI,OXFORD,MS 38677. RP PILE, PH (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. OI Quinn, Brian/0000-0003-2800-986X NR 13 TC 179 Z9 182 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 MAY 20 PY 1991 VL 66 IS 20 BP 2585 EP 2588 DI 10.1103/PhysRevLett.66.2585 PG 4 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600011 ER PT J AU AMENDT, P EDER, DC WILKS, SC AF AMENDT, P EDER, DC WILKS, SC TI X-RAY LASING BY OPTICAL-FIELD-INDUCED IONIZATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID HYDROGENIC IONS; TRANSITIONS; PLASMAS; LASER AB A scheme for accomplishing tabletop x-ray lasing in Li-like Ne at 98 angstrom in an optically ionized plasma during recombination in the transient regime is presented. Saturation effects and parametric heating processes by stimulated Raman scattering are analyzed and found to allow energy efficiencies in excess of 10(-5) for a 100-fsec-duration, 0.25-mu-m laser driver of intensity 10(17) W/cm2. Significant improvement in efficiency is indicated for shorter laser pulse lengths. RP AMENDT, P (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. NR 21 TC 177 Z9 179 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1991 VL 66 IS 20 BP 2589 EP 2592 DI 10.1103/PhysRevLett.66.2589 PG 4 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600012 ER PT J AU KULANDER, KC SCHAFER, KJ KRAUSE, JL AF KULANDER, KC SCHAFER, KJ KRAUSE, JL TI DYNAMIC STABILIZATION OF HYDROGEN IN AN INTENSE, HIGH-FREQUENCY, PULSED LASER FIELD SO PHYSICAL REVIEW LETTERS LA English DT Article ID IONIZATION; SUPERINTENSE; SUPPRESSION; GENERATION; RADIATION; ATOM AB We present calculations of ionization rates, trapping probabilities, and electron densities for a three-dimensional hydrogen atom in an intense, high-frequency, pulsed laser field. Under certain conditions, we find that hydrogen has a significant probability of surviving the ramp of the laser field to intensities at which ionization is strongly suppressed. We examine the dynamics of this process and discuss a method to observe it experimentally. RP KULANDER, KC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 14 TC 264 Z9 267 U1 1 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1991 VL 66 IS 20 BP 2601 EP 2604 DI 10.1103/PhysRevLett.66.2601 PG 4 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600015 ER PT J AU UEMURA, YJ LE, LP LUKE, GM STERNLIEB, BJ WU, WD BREWER, JH RISEMAN, TM SEAMAN, CL MAPLE, MB ISHIKAWA, M HINKS, DG JORGENSEN, JD SAITO, G YAMOCHI, H AF UEMURA, YJ LE, LP LUKE, GM STERNLIEB, BJ WU, WD BREWER, JH RISEMAN, TM SEAMAN, CL MAPLE, MB ISHIKAWA, M HINKS, DG JORGENSEN, JD SAITO, G YAMOCHI, H TI BASIC SIMILARITIES AMONG CUPRATE, BISMUTHATE, ORGANIC, CHEVREL-PHASE, AND HEAVY-FERMION SUPERCONDUCTORS SHOWN BY PENETRATION-DEPTH MEASUREMENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; MUON-SPIN ROTATION; MAGNETIC-FIELD PENETRATION; TEMPERATURE; KAPPA-(BEDT-TTF)2CU(NCS)2; RELAXATION; MASS; UPT3; GAP AB Muon-spin-relaxation and bulk measurements of the magnetic-field penetration depth suggest that the cuprate high-T(c), bismuthate, organic, Chevrel-phase, and heavy-fermion systems possibly belong to a unique group of superconductors characterized by high transition temperatures T(c) relative to the values of n(s)/m* (carrier density/effective mass). This feature distinguishes these exotic superconductors from ordinary BCS superconductors. C1 UNIV BRITISH COLUMBIA, VANCOUVER V6T 2A3, BC, CANADA. UNIV BRITISH COLUMBIA, TRIUMF, VANCOUVER V6T 2A3, BC, CANADA. UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. UNIV TOKYO, INST SOLID STATE PHYS, TOKYO 106, JAPAN. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. KYOTO UNIV, DEPT CHEM, KYOTO 606, JAPAN. RP COLUMBIA UNIV, DEPT PHYS, NEW YORK, NY 10027 USA. RI Luke, Graeme/A-9094-2010; OI Luke, Graeme/0000-0003-4762-1173; Brewer, Jesse H./0000-0002-8211-1235 NR 29 TC 545 Z9 549 U1 5 U2 37 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1991 VL 66 IS 20 BP 2665 EP 2668 DI 10.1103/PhysRevLett.66.2665 PG 4 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600031 ER PT J AU MANDULA, JE AF MANDULA, JE TI ANOMALOUS GLUON CONTRIBUTION TO THE PROTON SPIN - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter RP MANDULA, JE (reprint author), US DOE,DIV HIGH ENERGY PHYS,WASHINGTON,DC 20545, USA. NR 5 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1991 VL 66 IS 20 BP 2685 EP 2685 DI 10.1103/PhysRevLett.66.2685 PG 1 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600039 ER PT J AU MYRICK, ML HUD, NV ANGEL, SM GARVIS, DG AF MYRICK, ML HUD, NV ANGEL, SM GARVIS, DG TI TUNNELING SPECTROSCOPY ON GRAPHITE DEFECTS - IMPLICATIONS FOR BIOLOGICAL STM SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MICROSCOPY; STATES AB Scanning-tunneling-microscope images are obtained for freshly cleaved graphite in air. Large flat regions of graphite are observed, as well as steps between graphite layers. Tunneling spectroscopy (TS) shows a lower surface density of states for graphite near surface defects at the bias voltages tested. This indicates that TS is sensitive to the state of the substrate and this may have implications regarding the use of TS to reveal detailed information about the presence of molecular adsorbates on surfaces with defects. RP MYRICK, ML (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM SCI,POB 808,LIVERMORE,CA 94550, USA. OI Myrick, Michael/0000-0002-6905-0925; Angel, Stanley/0000-0002-0328-0568 NR 16 TC 6 Z9 6 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 17 PY 1991 VL 180 IS 3 BP 156 EP 160 DI 10.1016/0009-2614(91)87133-V PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FQ317 UT WOS:A1991FQ31700003 ER PT J AU NOVOA, JJ WHANGBO, MH WILLIAMS, JM AF NOVOA, JJ WHANGBO, MH WILLIAMS, JM TI INTERACTION ENERGIES ASSOCIATED WITH SHORT INTERMOLECULAR CONTACTS OF C-H BONDS .4. ABINITIO COMPUTATIONAL STUDY OF C-H ... ANION INTERACTIONS IN CH4...X- (X = F, CL, BR, I) SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ORGANIC SUPERCONDUCTOR; BASIS-SETS; TRANSITION; REACTIVITY; ELEMENTS; SALTS; TC AB We carried out SCF and MP2 calculations on the corner-bridged (1, C3v), edge-bridged (2, C2v) and face-bridged (3, C3v) structures of CH4...X- (X = F, Cl, Br, I). Our study shows that the relative stabilities of the structures 1-3 decrease in the order 1 > 2 > 3, that 1 is the only minimum-energy structure, and that the stabilization energies of the structure 1 decrease in the order X- = F- >> Cl- > Br- > I-. The C-H...X- interaction energies are estimated to be 6.1, 2.7, 2.5 and 2.0 kcal/mol for X = F, Cl, Br and I, respectively. C1 ARGONNE NATL LAB,DIV CHEM & MAT SCI,ARGONNE,IL 60439. RP NOVOA, JJ (reprint author), N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695, USA. RI Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 22 TC 21 Z9 21 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 17 PY 1991 VL 180 IS 3 BP 241 EP 248 DI 10.1016/0009-2614(91)87147-4 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FQ317 UT WOS:A1991FQ31700017 ER PT J AU AMES, BN GOLD, LS AF AMES, BN GOLD, LS TI CARCINOGENESIS MECHANISMS - THE DEBATE CONTINUES SO SCIENCE LA English DT Letter ID INTERCELLULAR COMMUNICATION; RODENT CARCINOGENS; TOO C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP AMES, BN (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,401 BARKER HALL,BERKELEY,CA 94720, USA. NR 14 TC 13 Z9 13 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 17 PY 1991 VL 252 IS 5008 BP 902 EP 902 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FM040 UT WOS:A1991FM04000002 ER PT J AU CAHN, RN AF CAHN, RN TI THE JOY OF INSIGHT - PASSIONS OF A PHYSICIST - WEISSKOPE,V SO SCIENCE LA English DT Book Review RP CAHN, RN (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 17 PY 1991 VL 252 IS 5008 BP 995 EP 996 DI 10.1126/science.252.5008.995 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FM040 UT WOS:A1991FM04000060 PM 17843247 ER PT J AU VINJE, K ULAN, J SZOSTAK, R GRONSKY, R AF VINJE, K ULAN, J SZOSTAK, R GRONSKY, R TI STACKING DISORDERS IN VPI-5 AND ALPO4-8 AND THE RELATED LOSS OF ADSORPTION CAPACITY SO APPLIED CATALYSIS LA English DT Article DE ADSORPTION; ALPO4-8; CRYSTAL DISORDERS; STACKING DISORDERS; VPI-5; ZEOLITES ID MOLECULAR-SIEVE AB The transformation of VPI-5 to AlPO4-8 generates stacking disorders within the crystal which severely restricts its function as a molecular sieve. Evidence of these stacking disorders is established with adsorption measurements and high resolution transmission electron microscopy (HRTEM). Even partial transformation (less than 10% conversion to AlPO(4)-8) results in an 80% loss in adsorption capacity. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, DIV MAT CHEM SCI, BERKELEY, CA 94720 USA. GEORGIA INST TECHNOL, GEORGIA TECH RES INST, ZEOLITE RES PROGRAM, ATLANTA, GA 30332 USA. RP VINJE, K (reprint author), CTR IND RES, POB 124 BLINDERN, N-0315 OSLO, NORWAY. NR 12 TC 34 Z9 34 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-9834 J9 APPL CATAL PD MAY 16 PY 1991 VL 72 IS 2 BP 361 EP 372 DI 10.1016/0166-9834(91)85062-Z PG 12 WC Chemistry, Physical SC Chemistry GA FN872 UT WOS:A1991FN87200012 ER PT J AU LIN, S STRUVE, WS ANSTEAD, GM KATZENELLENBOGEN, JA AF LIN, S STRUVE, WS ANSTEAD, GM KATZENELLENBOGEN, JA TI TIME-RESOLVED FLUORESCENCE SPECTROSCOPY OF SOLVATOCHROMIC-2,3-DIARYLINDENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LOW-VISCOSITY SOLVENTS; GROUND-STATE; LASER-DYES; EMISSION-SPECTROSCOPY; MOLECULAR-STRUCTURE; 2,3-DIARYLINDENES; PHOTOCHEMISTRY; PROBE; DECAY; DIARYLETHYLENES AB The fluorescence decay kinetics of the Stokes-shifted emission bands in two strongly solvatochromic diarylindenes, 2-(3-nitrophenyl)-3-(4-methoxyphenyl)-6-methoxyindene (2) and 2-(4-nitrophenyl)-3-(4-methoxyphenyl)-6-methoxyindene (2) have been investigated through time-correlated photon counting in several solvents with varying polarity. Neither of the indenes exhibits single-exponential decay. The 1/e emission lifetimes of indene 2 (which exhibits smaller fluorescence Stokes shifts than indene 1) are typically approximately 3 ns and vary little with solvent polarity. The corresponding lifetimes for indene 1 (which displays exceptionally large emission Stokes shifts of 11 000-16 000 cm-1) are strongly solvent-dependent, varying from several nanoseconds in nonpolar solvents to several hundred picoseconds in polar solvents. The lifetime trend in indene 1 is consistent with S1-S0 nonradiative decay in a twisted intramolecular charge-transfer (TICT) state across an energy gap whose width is controlled by the solvent polarity. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV ILLINOIS,DEPT CHEM,URBANA,IL 61801. NR 36 TC 4 Z9 4 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1991 VL 95 IS 10 BP 3919 EP 3923 DI 10.1021/j100163a008 PG 5 WC Chemistry, Physical SC Chemistry GA FM513 UT WOS:A1991FM51300008 ER PT J AU ROLES, J GUIOCHON, G AF ROLES, J GUIOCHON, G TI DETERMINATION OF THE SURFACE-ENERGY DISTRIBUTION USING ADSORPTION-ISOTHERM DATA OBTAINED BY GAS SOLID CHROMATOGRAPHY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MODIFIED SILICA-GELS; PHYSICAL ADSORPTION; NITROGEN ADSORPTION; HETEROGENEOUS SOLIDS; RANDOM CONFIGURATION; EQUATION; LIQUID AB A new numerical method for calculating the adsorption energy distribution function from adsorption isotherm data is introduced. It is intended to be robust with respect to quasi-Langmuir adsorption isotherms, the type most often observed in inverse gas chromatographic experiments involving energetically heterogeneous stationary phases. The stability of the method and the accuracy of its solutions is demonstrated by using simulated data. The determination of the energy distribution of diethyl ether on activated alumina is reported. It is composed of two narrow bands at 11.04 and 12.68 kcal/mol. The variances of these bands are 1.66 X 10(-5) and 1.00 X 10(-6) kcal2/mol2, respectively. The monolayer capacity is 5.36 X 10(-6) mol/g for the low-energy band and 2.53 X 10(-6) mol/g for the high-energy band. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 66 TC 26 Z9 26 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1991 VL 95 IS 10 BP 4098 EP 4109 DI 10.1021/j100163a038 PG 12 WC Chemistry, Physical SC Chemistry GA FM513 UT WOS:A1991FM51300038 ER PT J AU LYLE, PA STRUVE, WS AF LYLE, PA STRUVE, WS TI TEMPERATURE-DEPENDENCE OF ANTENNA EXCITATION TRANSPORT IN NATIVE PHOTOSYSTEM-I PARTICLES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BACTERIOCHLOROPHYLL-A-PROTEIN; PUMP PROBE SPECTROSCOPY; PROSTHECOCHLORIS-AESTUARII; ENERGY-TRANSFER; ELECTRON-TRANSFER; PHOTOSYNTHESIS; ABSORPTION; DYNAMICS; COMPLEX; SPINACH AB The temperature dependence of polarized photobleaching dynamics was investigated through 680-nm pump-probe experiments in the Chl a antenna of native photosystem I particles (Chl/P700 approximately 200) from spinach. The anisotropic decay time is lengthened by an order of magnitude (from approximately 7 to approximately 62 ps) when the temperature is reduced from 290 to 38 K; most of this increase occurs between 65 and 38 K. The occurrence of this transition temperature in the tens of kelvin reflects the participation of protein phonons in antenna EET. The isotropic decay kinetics are considerably less temperature sensitive, indicating that the anisotropic and isotropic decays stem from different energy-transfer processes with contrasting temperature dependence. The 38 K photobleaching spectrum at 5 ps exhibits considerably more weighting in the lower energy Chl a spectral forms than the room-temperature spectrum, suggesting that rapid spectral equilibration occurs in the photosystem I antenna. In light of the phonon frequency and electron-phonon coupling parameters determined in independent PSI-200 spectral hole-burning experiments, the quantitative temperature dependence in the anisotropic decay times is consistent with a theory for phonon-assisted EET in which the pertinent phonons are independent modes localized about the donor and acceptor chromophores. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 36 TC 18 Z9 18 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 16 PY 1991 VL 95 IS 10 BP 4152 EP 4158 DI 10.1021/j100163a047 PG 7 WC Chemistry, Physical SC Chemistry GA FM513 UT WOS:A1991FM51300047 ER PT J AU BEIRIGER, JM GRANT, PM AF BEIRIGER, JM GRANT, PM TI ENTHALPY OF REACTION OF THORIUM(IV) WITH OXALATE SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-LETTERS LA English DT Article ID COMPLEXATION; THERMODYNAMICS AB We have employed titration calorimetry to investigate the aqueous solution chemistry of the Th (IV) + oxalate coordination system. The enthalpies of formation of the two oxalic acid species and the first Th-oxalate complex have been measured at an ionic strength I = 1.0M and temperature t = 25-degrees-C. Corresponding entropy values were calculated from the van't Hoff equation, and a thermodynamic summary of the Th/H/oxalate system is presented in a table. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM L-234,LIVERMORE,CA 94550. NR 12 TC 3 Z9 3 U1 1 U2 2 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH LE JI J. Radioanal. Nucl. Chem.-Lett. PD MAY 16 PY 1991 VL 154 IS 2 BP 89 EP 94 DI 10.1007/BF02162666 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA FQ101 UT WOS:A1991FQ10100002 ER PT J AU ZAMFIR, NV CASTEN, RF AF ZAMFIR, NV CASTEN, RF TI SIGNATURES OF GAMMA-SOFTNESS OR TRIAXIALITY IN LOW-ENERGY NUCLEAR-SPECTRA SO PHYSICS LETTERS B LA English DT Article ID INTERACTING BOSON MODEL AB Signatures of gamma-softness or rigid triaxiality in low energy, low spin nuclear spectra are discussed. Two classes of signatures, relating to gamma-band energy staggering, are found to provide clear distinctions between these shapes. The data for even-even nuclei are compared to predictions for potentials with varying gamma-dependence. It is found that nuclei with large asymmetries can be characterized by potentials that are nearly gamma-flat, with, at most, a few percent deviation from gamma-independence. C1 INST ATOM PHYS,BUCHAREST,ROMANIA. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE,GERMANY. RP ZAMFIR, NV (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 17 TC 131 Z9 132 U1 1 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 MAY 16 PY 1991 VL 260 IS 3-4 BP 265 EP 270 DI 10.1016/0370-2693(91)91610-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FP725 UT WOS:A1991FP72500001 ER PT J AU PEILERT, G RANDRUP, J STOCKER, H GREINER, W AF PEILERT, G RANDRUP, J STOCKER, H GREINER, W TI CLUSTERING IN NUCLEAR-MATTER AT SUBSATURATION DENSITIES SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; UEHLING-UHLENBECK THEORY; QUANTUM MOLECULAR-DYNAMICS; GROUND-STATE PROPERTIES; GAS PHASE-TRANSITION; MANY-BODY MODEL; CLASSICAL SIMULATION; STATISTICAL MULTIFRAGMENTATION; MICROSCOPIC CALCULATIONS; QUASIPARTICLE DYNAMICS AB Canonical Metropolis simulations of nuclear matter at finite temperatures are made with a quasi-classical many-body model. It is demonstrated that considerable clustering develops at subsaturation densities. This effect lowers the energy by several MeV per nucleon, for temperatures below almost-equal-to 8 MeV. This result will modify previous simple estimates of the critical parameters of the liquid-vapour phase transition. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP PEILERT, G (reprint author), UNIV FRANKFURT,INST THEORET PHYS,W-6000 FRANKFURT,GERMANY. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 56 TC 51 Z9 51 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 16 PY 1991 VL 260 IS 3-4 BP 271 EP 277 DI 10.1016/0370-2693(91)91611-X PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FP725 UT WOS:A1991FP72500002 ER PT J AU ZHOU, XG TU, XL WOUTERS, JM VIEIRA, DJ LOBNER, KEG SEIFERT, HL ZHOU, ZY BUTLER, GW AF ZHOU, XG TU, XL WOUTERS, JM VIEIRA, DJ LOBNER, KEG SEIFERT, HL ZHOU, ZY BUTLER, GW TI DIRECT MASS MEASUREMENTS OF THE NEUTRON-RICH ISOTOPES OF FLUORINE THROUGH CHLORINE SO PHYSICS LETTERS B LA English DT Article ID SPECTROMETER; REGION; NUCLEI; MODEL AB The masses of 34 neutron-rich isotopes of fluorine through chlorine are reported. These measurements more fully delineate the mass surface in the region of deformed nuclei centered around 31Na and, in addition, provide the first mass values of several silicon through sulfur nuclei. We compare our data to recent shell model and mass model calculations. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. UNIV MUNICH,SEKT PHYS,W-8046 GARCHING,GERMANY. UNIV GIESSEN,INST PHYS 2,W-6300 GIESSEN,GERMANY. NANJING UNIV,DEPT PHYS,NANJING,PEOPLES R CHINA. RP ZHOU, XG (reprint author), UTAH STATE UNIV,DEPT PHYS,LOGAN,UT 84322, USA. NR 24 TC 62 Z9 62 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 16 PY 1991 VL 260 IS 3-4 BP 285 EP 290 DI 10.1016/0370-2693(91)91613-Z PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FP725 UT WOS:A1991FP72500004 ER PT J AU JADACH, S RICHTERWAS, E WARD, BFL WAS, Z AF JADACH, S RICHTERWAS, E WARD, BFL WAS, Z TI HIGHER-ORDER QED CORRECTIONS TO BHABHA SCATTERING AT LOW ANGLES SO PHYSICS LETTERS B LA English DT Article ID RADIATIVE-CORRECTIONS; PHOTON CORRECTIONS; HIGH-ENERGIES; ANNIHILATION; HARD; PAIR AB We calculate the QED bremsstrahlung corrections beyond O(alpha) for small-angle Bhabha scattering. These corrections are of vital importance for measuring the luminosity and consequently the total cross sections in LEP experiments. They are dominated by the second order leading-logarithmic contributions. We calculate them with the high technical precision 0.02% and we show that they depend strongly of the details of experimental cut-offs. We propose a practical method of introducing the O(alpha-2) correction calculated in this paper into current procedures of the luminosity measurement at LEP. The remaining overall QED uncertainty is estimated to be 0.3%. This estimate includes 0.2% due to pure bremsstrahlung and 0.1% due to light pair production but does not include hadronic uncertainty in the photon vacuum polarization. C1 INST NUCL PHYS,PL-30055 KRAKOW,POLAND. JAGIELLONIAN UNIV,CHAIR COMP SCI,PL-30059 KRAKOW,POLAND. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP JADACH, S (reprint author), CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. NR 25 TC 56 Z9 56 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 16 PY 1991 VL 260 IS 3-4 BP 438 EP 446 DI 10.1016/0370-2693(91)91640-H PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FP725 UT WOS:A1991FP72500031 ER PT J AU AGRON, PA ELLISON, RD LEVY, HA AF AGRON, PA ELLISON, RD LEVY, HA TI STRUCTURE OF IRON DIRHENIUM TETRADECACARBONYL, [RE(CO)5FE(CO)4RE(CO)5] SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID CARBONYL; CLUSTERS AB Tetracarbonylbis(pentacarbonylrhenio)-iron, [FeRe2(CO)14], M(r) = 820.4, monoclinic, C2/m, a = 12.062 (1), b = 14.679 (1), c = 11.816 (1) angstrom, beta = 97.31 (1)-degrees, V = 2075.1 angstrom 3, Z = 4, D(x) = 2.626 g cm-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 129 cm-1, F(000) = 1488, T = 295 K, R(F2) = 0.049 for 1580 reflections having F2 > sigma(F2), wR(F2) = 0.03. The asymmetric unit contains two crystallographically distinct molecules with symmetry 2/m, similar to those found in FeMn2(CO)14. Both molecules have linear arrangements of metal atoms without bridging carbonyl linkages, but differ in disposition of symmetry elements. The principal observations discussed are a shortening of the Re-Fe bond [0.027 (2) angstrom] and a torsional distortion of the Re(CO)5 and Fe(CO)4 groups from an idealized staggered configuration [45 --> 40.2 (5)-degrees] in one of the two independent molecules. These differences between the two molecules are attributed to differences in crystalline environment. Interatomic distances have also been reported but without discussion by Crocker, Mattson, Heinekey & Schulte [Inorg. Chem. (1988), 27, 3722-3729]. RP AGRON, PA (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 16 TC 3 Z9 3 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 MAY 15 PY 1991 VL 47 BP 913 EP 916 DI 10.1107/S0108270190011258 PN 5 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA FN530 UT WOS:A1991FN53000001 ER PT J AU WHITTEN, WB RAMSEY, JM ARNOLD, S BRONK, BV AF WHITTEN, WB RAMSEY, JM ARNOLD, S BRONK, BV TI SINGLE-MOLECULE DETECTION LIMITS IN LEVITATED MICRODROPLETS SO ANALYTICAL CHEMISTRY LA English DT Article ID LASER-INDUCED FLUORESCENCE; HYDRODYNAMICALLY FOCUSED FLOWS; ELECTRODYNAMIC BALANCE; LIGHT-SCATTERING; PARTICLES; PHYCOERYTHRIN; SPHERES; SIZE AB Laser-excited fluorescence from electrodynamically levitated microdroplets is used to detect small numbers of rhodamine-6G molecules. The small sample volume, typically a few picoliters reduces the background due to solvent and impurity Raman and fluorescence emission. With 514.5-nm excitation from an argon ion laser, as few as 12 molecules have been detected in glycerol-water droplets. Our present detection limit, due to variations in the impurity concentration in the blanks, corresponds to a signal-to-noise ratio of 3 for a single molecule of rhodamine-6G contained in a 1-pL volume (droplet diameter of congruent-to 12-mu-m). C1 POLYTECH INST NEW YORK,DEPT PHYS,BROOKLYN,NY 11201. USA,CTR CHEM RES DEV & ENGN,ABERDEEN PROVING GROUND,MD 21010. RP WHITTEN, WB (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 28 TC 88 Z9 88 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 15 PY 1991 VL 63 IS 10 BP 1027 EP 1031 DI 10.1021/ac00010a019 PG 5 WC Chemistry, Analytical SC Chemistry GA FL305 UT WOS:A1991FL30500021 ER PT J AU ELKIND, MM BEDFORD, JS BENJAMIN, SA HOOVER, EA SINCLAIR, WK WALLACE, SS ZIMBRICK, JD AF ELKIND, MM BEDFORD, JS BENJAMIN, SA HOOVER, EA SINCLAIR, WK WALLACE, SS ZIMBRICK, JD TI ONCOGENIC MECHANISMS IN RADIATION-INDUCED CANCER SO CANCER RESEARCH LA English DT Editorial Material C1 COLORADO STATE UNIV, DEPT PATHOL, FT COLLINS, CO 80523 USA. NATL COUNCIL RADIAT PROTECT & MEASUREMENTS, BETHESDA, MD 20814 USA. UNIV VERMONT, DEPT MICROBIOL & MOLEC GENET, BURLINGTON, VT 05405 USA. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. RP ELKIND, MM (reprint author), COLORADO STATE UNIV, DEPT RADIOL HLTH SCI, FT COLLINS, CO 80523 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAY 15 PY 1991 VL 51 IS 10 BP 2740 EP 2747 PG 8 WC Oncology SC Oncology GA FK910 UT WOS:A1991FK91000038 PM 2021953 ER PT J AU CARTWRIGHT, DC HAY, PJ TRAJMAR, S AF CARTWRIGHT, DC HAY, PJ TRAJMAR, S TI ESTIMATION OF THE INTEGRAL CROSS-SECTION FOR DISSOCIATIVE EXCITATION OF F2 BY ELECTRON-IMPACT SO CHEMICAL PHYSICS LA English DT Article ID INCIDENT ENERGIES; STATES; TRANSITIONS; N2; FLUORINE; MOLECULE; H-2 AB Integral cross sections for electron impact dissociation of F2 as a function of incident electron energy are very important for predicting the performance of electron-beam-pumped KrF lasers. Approximate scaling relationships from similar transitions in N2 are combined with the few available electron energy-loss spectra in F2 to obtain an estimate of the direct dissociation cross section of F2 by electron impact from threshold to 100 eV. A conservative estimate of the direct dissociation cross section obtained by this process is very large (1.6 angstrom-2 at 25 eV) and appears to have a large contribution from excitation of perturbed Rydberg states at 12.87 eV. This estimated magnitude and the prediction of F+ and F- fragment production below the F+ ionization threshold (15.7 eV) should be checked experimentally because of the important role these processes play in rare-gas fluoride lasers. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. RP CARTWRIGHT, DC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 28 TC 6 Z9 6 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD MAY 15 PY 1991 VL 153 IS 1-2 BP 219 EP 231 DI 10.1016/0301-0104(91)90020-T PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FM943 UT WOS:A1991FM94300020 ER PT J AU YUNLU, K GRADEFF, PS EDELSTEIN, N KOT, W SHALIMOFF, G STREIB, WE VAARTSTRA, BA CAULTON, KG AF YUNLU, K GRADEFF, PS EDELSTEIN, N KOT, W SHALIMOFF, G STREIB, WE VAARTSTRA, BA CAULTON, KG TI PHOTOREDUCTION OF CERIUM(IV) IN CE2(OPR-I)8(PR-IOH)2 - CHARACTERIZATION AND STRUCTURE OF CE4O(OPR-I)13(PR-IOH) SO INORGANIC CHEMISTRY LA English DT Article ID RAY CRYSTAL-STRUCTURE; BUTTERFLY OXO CLUSTER; COMPLEXES; ALKOXIDE; CHEMISTRY; NITRATE; YTTRIUM AB Visible irradiation of Ce2(O(i)Pr)8((i)PrOH)2 yields the mixed-valence compound Ce4O(O(i)Pr)13((i)PrOH), characterized by H-1 NMR and infrared spectra, elemental analysis, and X-ray diffraction. The structure is described as Ce4(mu-4-O)(mu-3-O(i)Pr)2(mu-2-O(i)Pr)4(O(i)Pr)7((i)PrOH). The Ce4(mu-4-O) core has a butterfly form, with a crystallographic C2 axis that passes through the oxide ion and the center of a symmetric hydrogen bond between the coordinated alcohol and one terminal alkoxide. This photoredox reaction cannot be thermally induced and requires that hydrogen be present on the carbon alpha to the alkoxide oxygen. Magnetic susceptibility and EPR studies show the compound to be paramagnetic. Two temperature ranges of Curie-Weiss behavior are observed with mu-eff = 2.7 mu-B from 80 to 300 K. Crystal data (-130-degrees-C): a 21.405 (6) angstrom, b = 14.077 (3) angstrom, c = 20.622 (6) angstrom, and beta = 103.97 (1)-degrees with Z = 4 in space group C2/c. C1 INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. INDIANA UNIV,CTR MOLEC STRUCT,BLOOMINGTON,IN 47405. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RHONE POULENC INC,NEW BRUNSWICK,NJ 08901. NR 31 TC 58 Z9 59 U1 0 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 MAY 15 PY 1991 VL 30 IS 10 BP 2317 EP 2321 DI 10.1021/ic00010a018 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FM296 UT WOS:A1991FM29600018 ER PT J AU KAISER, RE COOKS, RG STAFFORD, GC SYKA, JEP HEMBERGER, PH AF KAISER, RE COOKS, RG STAFFORD, GC SYKA, JEP HEMBERGER, PH TI OPERATION OF A QUADRUPOLE ION TRAP MASS-SPECTROMETER TO ACHIEVE HIGH MASS CHARGE RATIOS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID CHEMICAL IONIZATION; METAL-HALIDES; DISTRIBUTIONS AB One of the principal limitations of the commercial quadrupole ion trap mass spectrometer is the relatively low limiting value of mass/charge ratio (650 Da per charge). This constraint limits applications of desorption ionization techniques which can produce ions of many thousand Da per charge. Several techniques for extending the mass/charge range of the quadrupole ion trap are presented. These include (i) the use of smaller electrodes, (ii) operation at lower radio frequencies, and (iii) resonance ion ejection using a voltage of appropriate frequency, applied symmetrically across the end-cap electrodes during the mass scan. The performance of each of these methods is compared using external ionization of alkali halide salts with Cs+ bombardment. Special attention is given to the effects of scan rate on resolution and a method of reducing the scan rate without loss of data is described. Mass measurement accuracy is studied in some detail, the mass shifts which occur using resonance ejection are characterized and this information is used to correct mass assignments. The relative merits of the three methods of mass range extension are assessed. Field inhomogeneities in the particular smaller electrodes used here apparently cause some loss of performance in these devices making them the least successful of the methods. Frequency reduction gives excellent results over a limited range of m/z values. However, resonance ejection can be used alone to achieve an even greater m/z extension and is the (single) method of choice. A combination of modest size and frequency reduction with axial modulation is probably an ideal solution for high mass biological mass spectrometry. Performance at high mass is illustrated by recording data on CsI clusters and on peptides. These experiments show that mass/charge measurements are accurate to better than 0.1% without external calibration, that a mass resolution of 3000 FWHM is achieved (unit resolution at 50% valley to 3000), and that a mass/charge range in excess of 70 000 Da per charge is accessible. C1 FINNIGAN MAT CORP,SAN JOSE,CA 95134. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KAISER, RE (reprint author), PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907, USA. RI Cooks, R/G-1051-2015 OI Cooks, R/0000-0002-9581-9603 NR 25 TC 208 Z9 210 U1 3 U2 26 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAY 15 PY 1991 VL 106 BP 79 EP 115 DI 10.1016/0168-1176(91)85013-C PG 37 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FP130 UT WOS:A1991FP13000006 ER PT J AU ECKENRODE, BA MCLUCKEY, SA GLISH, GL AF ECKENRODE, BA MCLUCKEY, SA GLISH, GL TI COMPARISON OF ELECTRON IONIZATION AND CHEMICAL IONIZATION SENSITIVITIES IN AN ION TRAP MASS-SPECTROMETER SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID REACTANT IONS AB The factors that influence the sensitivity and detection limits under electron ionization (EI) and chemical ionization (CI) conditions in an ion trap mass spectrometer have been examined. It was found that for benzophenone, EI had a three times lower detection limit than CI, and EI was approximately three times more sensitive for the detection of the molecular species. When sensitivities were compared on the basis of total ion current detected, using equal duty cycles, EI was observed to be fifteen times more sensitive than CI. Selected reagent ion CI is shown, by defining the kinetic as well as thermodynamic aspects of the ion/molecule reactions in the ion trap, to be particularly useful in sensitivity studies and should be exploited for certain analyses. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 24 TC 18 Z9 18 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAY 15 PY 1991 VL 106 BP 137 EP 157 DI 10.1016/0168-1176(91)85015-E PG 21 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FP130 UT WOS:A1991FP13000008 ER PT J AU GOERINGER, DE WHITTEN, WB RAMSEY, JM AF GOERINGER, DE WHITTEN, WB RAMSEY, JM TI RESONANCE-ENHANCED MULTIPHOTON IONIZATION SPECTROSCOPY IN AN ION TRAP DETECTOR SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID MASS-SPECTROMETER; NITRIC-OXIDE; LASER DESORPTION; PHOTO-IONIZATION; NO; STATE AB The potential benefits of performing laser photoionization experiments in an ion trap detector (ITD) are investigated. The 2 + 2 resonance-enhanced multiphoton ionization (REMPI) of nitric oxide NO through the A2-SIGMA+ (nu = 1) <-- X2-PI-1/2 (nu = 0) transition is studied. Mass spectra which reveal various isotopic combinations of NO are recorded simultaneously as the laser is scanned. With 6 ppm of NO in the He buffer gas the P11 + O-12 bandheads of the three most abundant NO isotopomers can be identified. The corresponding concentration of the (NO)-N-14-O-18 isotopomer is 13 +/- 3 ppb which is considered to be the limit of detection. The trap volume contains almost-equal-to 10(6) molecules at the detection limit and almost-equal-to 50 of these molecules are accessible to the laser at the bandhead. The concentration and molecular-number detection limits are factors of 30 and 150 better, respectively, than those obtained by other workers with a supersonic beam time-of-flight apparatus using a 2 + 1 REMPI scheme. This photoionization scheme is also at least 10 times more sensitive than electron impact ionization in the ITD. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 22 TC 11 Z9 11 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAY 15 PY 1991 VL 106 BP 175 EP 189 DI 10.1016/0168-1176(91)85017-G PG 15 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FP130 UT WOS:A1991FP13000010 ER PT J AU MCLUCKEY, SA GLISH, GL VANBERKEL, GJ AF MCLUCKEY, SA GLISH, GL VANBERKEL, GJ TI MULTIPLE STAGES OF MASS-SPECTROMETRY IN A QUADRUPOLE ION TRAP MASS-SPECTROMETER - PREREQUISITES SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID CHEMICAL IONIZATION; REACTANT IONS; DISSOCIATION AB The number of stages of mass spectrometry that can be performed with a quadrupole ion trap is discussed. The conditions necessary, both instrumental and chemical, to maximize the number of stages are delineated. The overall efficiency of the MS(n) experiment is broken down into the isolation efficiency of the initial parent ion, the conversion efficiencies associated with the conversion of first generation parents to second generation parents, and so on, and the efficiency of the final step which yields the final product ions. The conversion efficiencies are further broken down into component terms that reflect both instrumental and chemical factors. Both collision-induced dissociation reactions and low energy ion/molecule reactions are discussed. These considerations are illustrated with MS(n) experiments involving ions derived from aniline, N,N-dimethylaniline, and several porphyrins. RP MCLUCKEY, SA (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 34 TC 91 Z9 91 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAY 15 PY 1991 VL 106 BP 213 EP 235 DI 10.1016/0168-1176(91)85020-M PG 23 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FP130 UT WOS:A1991FP13000013 ER PT J AU HEMBERGER, PH ALARID, JE CAMERON, D LEIBMAN, CP CANNON, TM WOLF, MA KAISER, RE AF HEMBERGER, PH ALARID, JE CAMERON, D LEIBMAN, CP CANNON, TM WOLF, MA KAISER, RE TI A TRANSPORTABLE TURNKEY GAS-CHROMATOGRAPH ION TRAP DETECTOR FOR FIELD ANALYSIS OF ENVIRONMENTAL-SAMPLES SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID PROCESS ANALYTICAL-CHEMISTRY; MASS-SPECTROMETRY; CAPILLARY COLUMNS AB A transportable gas chromatograph-ion trap detector has been developed for the in situ characterization of chemical waste sites. This instrument is based on a modular design and can be readily modified in the field for air, water, or soil sampling. A purge-and-trap gas chromatograph developed for this instrument is used for the separation of volatile organic compounds before their introduction to the ion trap for mass spectral analysis. A daughter microprocessor has been developed for the control of ancillary hardware via the ion trap software. Most analyses are accomplished in an automated 20 min procedure. The detection limit for trichloroethylene in water is in the low part-per-trillion range. The analysis of soil and water samples is demonstrated by using surrogate samples spiked with 24 volatile organic compounds. The instrument has been used under field conditions for soil analysis at a chemical waste site. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MECH & ELECTR ENGN,LOS ALAMOS,NM 87454. PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. RP HEMBERGER, PH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 23 TC 18 Z9 18 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAY 15 PY 1991 VL 106 BP 299 EP 313 DI 10.1016/0168-1176(91)85025-H PG 15 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FP130 UT WOS:A1991FP13000018 ER PT J AU GLISH, GL MCLUCKEY, SA AF GLISH, GL MCLUCKEY, SA TI SPECIAL ISSUE - QUADRUPOLE ION TRAPS - PREFACE SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Editorial Material RP GLISH, GL (reprint author), OAK RIDGE NATL LAB,POB 2008,BLDG 5510,OAK RIDGE,TN 37831, USA. NR 0 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAY 15 PY 1991 VL 106 BP R7 EP R8 DI 10.1016/0168-1176(91)85008-A PG 2 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FP130 UT WOS:A1991FP13000001 ER PT J AU EMAMI, B LYMAN, J BROWN, A COIA, L GOITEIN, M MUNZENRIDER, JE SHANK, B SOLIN, LJ WESSON, M AF EMAMI, B LYMAN, J BROWN, A COIA, L GOITEIN, M MUNZENRIDER, JE SHANK, B SOLIN, LJ WESSON, M TI TOLERANCE OF NORMAL TISSUE TO THERAPEUTIC IRRADIATION SO INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS LA English DT Article DE NORMAL TISSUE TOLERANCE; 3-DIMENSIONAL TREATMENT PLANNING; VOLUME EFFECTS; IRRADIATION ID INDUCED HEART-DISEASE; RADIATION-INDUCED PERICARDITIS; TOTAL-BODY IRRADIATION; THORACIC SPINAL-CORD; HODGKINS-DISEASE; COMPUTED-TOMOGRAPHY; MANTLE IRRADIATION; FIELD IRRADIATION; SMALL BOWEL; X-RAYS AB The importance of knowledge on tolerance of normal tissue organs to irradiation by radiation oncologists cannot be overemphasized. Unfortunately, current knowledge is less than adequate. With the increasing use of 3-D treatment planning and dose delivery, this issue, particularly volumetric information, will become even more critical. As a part of the NCI contract NO1 CM-47316, a task force, chaired by the primary author, was formed and an extensive literature search was carried out to address this issue. In this manuscript we present the updated information on tolerance of normal tissues of concern in the protocols of this contract, based on available data, with a special emphasis on partial volume effects. Due to a lack of precise and comprehensive data base, opinions and experience of the clinicians from four universities involved in the contract have also been contributory. Obviously, this is not and cannot be a comprehensive work, which is beyond the scope of this contract. C1 MEM MED CTR,SPRINGFIELD,IL 62781. UNIV PENN,SCH MED,DEPT RADIAT THERAPY,PHILADELPHIA,PA 19104. FOX CHASE CANC INST,PHILADELPHIA,PA 19111. MASSACHUSETTS GEN HOSP,DEPT RADIAT MED,BOSTON,MA 02114. HARVARD UNIV,SCH MED,BOSTON,MA 02115. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. RP EMAMI, B (reprint author), WASHINGTON UNIV,SCH MED,EDWARD MALLINCKRODT INST RADIOL,4939 AUDUBON AVE,ST LOUIS,MO 63110, USA. FU NCI NIH HHS [N01 CM-47316, N01 CM-47695, N01 CM-47696] NR 197 TC 2113 Z9 2208 U1 11 U2 79 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-3016 J9 INT J RADIAT ONCOL JI Int. J. Radiat. Oncol. Biol. Phys. PD MAY 15 PY 1991 VL 21 IS 1 BP 109 EP 122 PG 14 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA FM941 UT WOS:A1991FM94100010 PM 2032882 ER PT J AU MONTIERTH, LM NEUMAN, WA NIGG, DW MERRILL, BJ AF MONTIERTH, LM NEUMAN, WA NIGG, DW MERRILL, BJ TI ENERGY DEPOSITION IN DIRECT NUCLEAR PUMPED OPTICAL CAVITIES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LASER; CO AB A two-dimensional, time-dependent model has been developed to determine the coupled fluid dynamic and charged particle transport behavior of a flowing gas, nuclear pumped laser cavity. Stationary results are presented for a typical cavity that uses a flowing He buffer gas pumped with charged particles produced by the B-10(n,alpha)7Li reaction. The boron is coated on fuel plates mounted parallel to the flow direction. The effects of changing the buffer gas inlet flow velocity and outlet pressure are investigated. For a fixed inlet velocity, the results presented show that the gradients of the charged particle energy deposition and density increase in magnitude primarily in the direction perpendicular to the gas flow, i.e., normal to the fuel plates, as the outlet pressure is increased. With increasing inlet velocity and a fixed outlet pressure, the density variations decrease, whereas the variations in energy deposition increase in the direction perpendicular to the flow and decrease in the direction parallel to the gas flow. For higher inlet velocity cases, the deposition is nearly one-dimensional, varying primarily in the direction perpendicular to the flow. Qualitatively similar results can be found with an argon buffer gas and fission fragment pumping for similar charged particle ranges. In general, for a fixed cavity geometry similar charged particle energy deposition behavior can be obtained for different laser gases by adjusting the outlet pressure and charged particle source. RP MONTIERTH, LM (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 16 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 6776 EP 6788 DI 10.1063/1.347667 PG 13 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100003 ER PT J AU NEUMAN, WA FINCKE, JR AF NEUMAN, WA FINCKE, JR TI BEAM QUALITY OF DIRECT NUCLEAR PUMPED LASER-AMPLIFIERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CO AB The achievable beam quality resulting from heavy charged particle pumping of transverse flow, gas laser amplifiers is presented. The charged particles are generated by nuclear reactions in either B4C or UO2 coated on plates parallel to the lasant flow. The character of the laser medium aberration resulting from the nonuniform energy deposition and fluid dynamic effects is discussed as well as the effects on the far-field beam quality of the amplifier. Pumping from plates parallel to the flow produces a medium aberration which is dominated by a cylindrical focus perpendicular to the flow, and a tilt in the flow direction. Beam qualities of better than 2 times diffraction limited (TDL) are obtained with a B4C fueled 1-m-long amplifier pumped at an average power deposition of 100 W/cm3 with an inlet 0.1-MPa helium flow at 100 m/s. Amplifiers using UO2 fuel coatings to pump argon under the same flow conditions with fission fragments have similar qualitative laser medium aberrations but with larger magnitude, resulting in beam qualities of > 20 TDL for a 100 W/cm3 average power deposition. RP NEUMAN, WA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 15 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 6789 EP 6798 DI 10.1063/1.347668 PG 10 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100004 ER PT J AU MCGARRAH, DB ANTOLAK, AJ WILLIAMSON, W AF MCGARRAH, DB ANTOLAK, AJ WILLIAMSON, W TI ELASTIC-SCATTERING OF ELECTRONS BY FREE AND BOUND ZINC AND CADMIUM ATOMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CROSS-SECTIONS; OPTICAL-MODEL; SILICON AB Elastic differential and total cross sections are presented for electron scattering by zinc and cadmium using the optical model. The cross sections are determined for scattering by free atoms and by atoms bound in a solid. The phase shifts are obtained from solutions to the reduced radial wave equation based on an optical potential consisting of static, polarization, and exchange terms. Electron energies from 12.5 to 200 eV are considered. Differences in the total cross section from using two different forms of the exchange potential are examined. A simple parametric fit of the total cross section which is suitable for Monte Carlo applications is given. C1 UNIV TOLEDO,DEPT PHYS & ASTRON,TOLEDO,OH 43606. RP MCGARRAH, DB (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 16 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 6812 EP 6816 DI 10.1063/1.347670 PG 5 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100006 ER PT J AU JAEGER, EF BERRY, LA BATCHELOR, DB AF JAEGER, EF BERRY, LA BATCHELOR, DB TI CHARACTERISTICS OF A CYLINDRICAL LANGMUIR PROBE OF FINITE LENGTH SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ION-BEAMS; OPTICS; PLASMA AB The current collected by a finite-length cylindrical probe is calculated numerically from a self-consistent solution to the Poisson-Vlasov system of equations. A Boltzmann distribution is assumed for the electrons, and results are compared to the standard "orbital-motion-limited" theory. When the probe is very long compared to the sheath thickness and the ratio of probe radius to electron Debye length, R(p)/gamma-De less-than-or-similar-to 1, the collected current agrees with the orbital-motion theory for cylindrical probes; when the probe is very short compared to the sheath thickness and R(p)/gamma-De less-than-or-similar-to 1, the collected current agrees with the orbital-motion theory for spherical probes. When the probe length is comparable to the sheath thickness, there is a critical potential above which the probe behaves as a sphere and below which it behaves as a cylinder. Ion charge density, space potential, and ion particle orbits are displayed graphically in the sheath plasma surrounding the probe tip. RP JAEGER, EF (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 11 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 6918 EP 6922 DI 10.1063/1.347629 PG 5 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100018 ER PT J AU KOCH, JA MACGOWAN, BJ AF KOCH, JA MACGOWAN, BJ TI ALUMINUM-COATED OPTICAL FIBERS AS EFFICIENT INFRARED TIMING FIDUCIAL PHOTOCATHODES FOR SYNCHRONIZING X-RAY STREAK CAMERAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PULSE LASER EXCITATION; THERMAL RESPONSE; NONEQUILIBRIUM ELECTRON; PHOTOELECTRIC-EMISSION; LATTICE TEMPERATURES; WORK FUNCTION; METALS; COPPER; FEMTOSECOND; OXIDATION AB The timing fiducial system at the Nova Two-Beam Facility allows time-resolved x-ray and optical streak camera data from laser-produced plasmas to be synchronized to within 30 ps. In this system, an A1-coated optical fiber is inserted into an aperture in the cathode plate of each streak camera. The coating acts as a photocathode for a low-energy pulse of 1-omega (gamma = 1.054-mu-m) light which is synchronized to the main Nova beam. The use of the fundamental (1-omega) for this fiducial pulse has been found to offer significant advantages over the use of the 2-omega second harmonic (gamma = 0.53-mu-m). These advantages include brighter signals, greater reliability, and a higher relative damage threshold, allowing routine use without fiber replacement. The operation of the system is described, and experimental data and interpretations are discussed which suggest that the electron production in the A1 film is due to thermionic emission. The results of detailed numerical simulations of the relevant thermal processes, undertaken to model the response of the coated fiber to 1-omega laser pulses, are also presented, which gave qualitative agreement with experimental data. Quantitative discrepancies between the modeling results and the experimental data are discussed, and suggestions for further research are given. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP KOCH, JA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB, POB 5508, LIVERMORE, CA 94550 USA. NR 45 TC 8 Z9 8 U1 0 U2 1 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 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 6935 EP 6944 DI 10.1063/1.347631 PG 10 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100020 ER PT J AU THOMPSON, LR COLLINS, GJ STEIN, HJ AF THOMPSON, LR COLLINS, GJ STEIN, HJ TI ELECTRICAL TRANSPORT AND RELATED PROPERTIES OF ZONE-MELT-RECRYSTALLIZED SILICON-ON-INSULATOR FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Electrical transport properties of zone-melt-recrystallized Si films of Si-on-Insulator wafers were investigated using resistivity and Hall effect measurements between 77 and 300 K. Both graphite strip and cold cathode electron beam methods were used for zone melting which produced high resistivity (> 10(3) OMEGA-cm at room temperature) recrystallized films. Phosphorus implantation into the silicon films to a dopant level of 1 x 10(16) cm-3 and subsequent annealing at 1100-degrees-C reduced the room-temperature resistivities to approximately 1 OMEGA-cm. Hall mobilities of 950 cm2/V s were observed at room temperature for both materials after the implant anneal sequence. However, for temperatures less than 150 K, the mobility is higher in graphite strip than in electron beam recrystallized films. This behavior is consistent with the relative crystalline qualities of the two films as determined by electron channeling and x-ray diffraction. It is noteworthy that a deep level was observed at 0.2 eV below the conduction band in the graphite strip recrystallized film but not in the electron beam recrystallized samples. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP THOMPSON, LR (reprint author), COLORADO STATE UNIV, DEPT ELECT ENGN, FT COLLINS, CO 80523 USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 7111 EP 7117 DI 10.1063/1.347651 PG 7 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100042 ER PT J AU CAMP, JB DARLING, TW BROWN, RE AF CAMP, JB DARLING, TW BROWN, RE TI MACROSCOPIC VARIATIONS OF SURFACE-POTENTIALS OF CONDUCTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The surface potential variations of the following conductors have been measured over a 0.7 cm2 area: bronze, NiP, conducting polymer (polyaniline), Al, Cu, Au, and graphite. The measurements were performed with a Kelvin probe of spatial and potential resolution of 1.5 mm and 1 m V, respectively. Subjecting the surfaces to no cleaning procedure other than a low temperature ultrahigh vacuum bake, we find a wide spectrum of variation in surface potential uniformity, with alloys typically the least uniform and nonreactive surfaces such as gold and graphite the most uniform (no fluctuations above the 1 m V probe sensitivity). Application of these results to the Los Alamos antiproton gravity experiment is discussed. RP CAMP, JB (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 70 Z9 70 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 7126 EP 7129 DI 10.1063/1.347601 PG 4 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100044 ER PT J AU SANFORD, TWL HALBLEIB, JA MCATEE, WH MIKKELSON, KA MOCK, RC POUKEY, JW AF SANFORD, TWL HALBLEIB, JA MCATEE, WH MIKKELSON, KA MOCK, RC POUKEY, JW TI IMPROVED FLASH X-RAY UNIFORMITY AT 19 MEV USING A COMPOUND-LENS DIODE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PLANAR-ANODE DIODE AB Significantly improved spatial uniformity of bremsstrahlung radiation, relative to a planar-anode diode, is obtained on the HERMES III accelerator when a compound-lens diode is used to control the 19-MeV, 700-kA electron beam. The compound-lens diode uses a conical anode to control the beam electrostatically, followed by a gas cell with externally applied current to control the beam magnetically. Variation of the external current enables average doses at the target to be varied by a factor of 3 without breaking the vacuum system of the accelerator to change diode hardware. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 10 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 7283 EP 7286 DI 10.1063/1.347626 PG 4 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100069 ER PT J AU BERRY, EA HUANG, LS DEROSE, VJ AF BERRY, EA HUANG, LS DEROSE, VJ TI UBIQUINOL-CYTOCHROME C OXIDOREDUCTASE OF HIGHER-PLANTS - ISOLATION AND CHARACTERIZATION OF THE BC1 COMPLEX FROM POTATO-TUBER MITOCHONDRIA SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID BEEF-HEART MITOCHONDRIA; POLYACRYLAMIDE-GEL ELECTROPHORESIS; OXIDATION-REDUCTION POTENTIALS; SACCHAROMYCES-CEREVISIAE; RESPIRATORY-CHAIN; PARACOCCUS-DENITRIFICANS; B-C1 COMPLEX; AFFINITY-CHROMATOGRAPHY; CARDIAC CYTOCHROME-C1; DENSITY GRADIENTS AB A procedure is described for isolation of active ubiquinol-cytochrome c oxidoreductase (bc1 complex) from potato tuber mitochondria using dodecyl maltoside extraction and ion exchange chromatography. The same procedure works well with mitochondria from red beet and sweet potato. The potato complex has at least 10 subunits resolvable by gel electrophoresis in the presence of dodecyl sulfate. The fifth subunit carries covalently bound heme. The two largest ("core") subunits either show heterogeneity or include a third subunit. The purified complex contains about 4-mu-mol of cytochrome c1, 8-mu-mol of cytochrome b, and 20-mu-mol of iron/g of protein. The complex is highly delipidated, with 1-6 mol of phospholipid and about 0.2 mol of ubiquinone/mol of cytochrome c1. Nonetheless it catalyzes electron transfer from a short chain ubiquinol analog to equine cytochrome c with a turnover number of 50-170 mol of cytochrome c reduced per mol of cytochrome c1 per s, as compared with approximately 220 in whole mitochondria. The enzymatic activity is stable for weeks at 4-degrees-C in phosphate buffer and for months at -20-degrees-C in 50% glycerol. The activity is inhibited by antimycin, myxothiazol, and funiculosin. The complex is more resistant to funiculosin and diuron than the beef heart enzyme. The optical difference spectra of the cytochromes were resolved by analysis of full-spectrum redox titrations. The alpha-band absorption maxima are 552 nm (cytochrome c1), 560 nm (cytochrome b-560), and 557.5 + 565.5 nm (cytochrome b-566, which has a split alpha-band). Extinction coefficients appropriate for the potato cytochromes are estimated. Despite the low lipid and ubiquinone content of the purified complex, the midpoint potentials of the cytochromes (257, 51, and -77 mV for cytochromes c1, b-560, and b-566, respectively) are not very different from values reported for whole mitochondria. EPR spectroscopy shows the presence of a Rieske-type iron sulfur center, and the absence of centers associated with succinate and NADH dehydrogenases. The complex shows characteristics associated with a Q-cycle mechanism of redox-driven proton translocation, including two pathways for reduction of b cytochromes by quinols and oxidant-induced reduction of b cytochromes in the presence of antimycin. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV CHEM BIODYNAM, BERKELEY, CA 94720 USA. RP BERRY, EA (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV CELL & MOLEC BIOL, BERKELEY, CA 94720 USA. FU NCRR NIH HHS [S07RR05918-05]; NIGMS NIH HHS [GM36884] NR 91 TC 69 Z9 71 U1 1 U2 3 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 EI 1083-351X J9 J BIOL CHEM JI J. Biol. Chem. PD MAY 15 PY 1991 VL 266 IS 14 BP 9064 EP 9077 PG 14 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FM038 UT WOS:A1991FM03800064 PM 1851164 ER PT J AU ZAJFMAN, D VAGER, Z NAAMAN, R MITCHELL, RE KANTER, EP GRABER, T BELKACEM, A AF ZAJFMAN, D VAGER, Z NAAMAN, R MITCHELL, RE KANTER, EP GRABER, T BELKACEM, A TI THE STRUCTURES OF C2H+ AND C2H2+ AS MEASURED BY COULOMB EXPLOSION IMAGING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID BAYESIAN DECONVOLUTION; ACETYLENE; STATES; MOLECULES; DETECTOR; MCSCF; IONS AB The structures of ethynyl and acetylene cations were investigated utilizing the Coulomb explosion imaging method. The geometrical probability density functions for the bending modes were obtained for the protonated and deuterated forms of each species. Detailed analyses of the data reveal that both the measured linear equilibrium geometries and the observed extent of the correlated bending vibrations agree with ab initio calculations for C2H2+ and C2D2+. C2H+ and C2D+ are found to be linear, but the extent of the bending amplitudes are by far larger than the corresponding theoretical predictions. C1 WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL. WEIZMANN INST SCI,DEPT CHEM PHYS,IL-76100 REHOVOT,ISRAEL. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. RP ZAJFMAN, D (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 21 TC 13 Z9 13 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1991 VL 94 IS 10 BP 6377 EP 6887 DI 10.1063/1.460316 PG 511 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FL001 UT WOS:A1991FL00100004 ER PT J AU SEDLACEK, AJ WESTON, RE FLYNN, GW AF SEDLACEK, AJ WESTON, RE FLYNN, GW TI INTERROGATING THE VIBRATIONAL-RELAXATION OF HIGHLY EXCITED POLYATOMICS WITH TIME-RESOLVED DIODE-LASER SPECTROSCOPY - C6H6, C6D6, AND C6F6+CO2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT ENERGY-TRANSFER; COLLISIONAL DEACTIVATION; FLASH-PHOTOLYSIS; HOT BENZENE; MOLECULES; CO2; EXCITATION; STATE; ABSORPTION; AZULENE AB The vibrational relaxation of highly excited ground state benzene d6, and hexafluorobenzene by CO2 has been investigated with high resolution diode laser spectroscopy. The vibrationally hot polyatomics are formed by single photon 248 nm excitation to the S1 state followed by rapid radiationless transitions. It has been found that in all cases less than 1% of the energy initially present in the polyatomics is deposited into the high frequency mode of CO2 (v3). An investigation of the CO2(00(0)1) nascent rotational distribution under single collision conditions reveals that very little rotational excitation accompanies vibrational energy transfer to the v3 mode. The CO2(v3) rotational states can be described by temperatures, T(rot), as follows: C6H6, T(rot) = 360 +/- 30 K; C6D6, T(rot) = 350 +/- 35 K and C6F6, T(rot) = 340 +/- 23 K. An estimate of v3, the mean energy transferred to the CO2 v3 mode per collision, suggests that as the availability of low frequency modes in the excited molecule increases, less energy is deposited into the high frequency mode of CO2. Finally, evidence is presented suggesting that even at moderate laser fluences, the two-photon ionization of benzene can lead to substantial CO2 v3 excitation via electron + CO2 inelastic collisions. C1 COLUMBIA UNIV,DEPT CHEM,NEW YORK,NY 10027. COLUMBIA UNIV,COLUMBIA RADIAT LAB,NEW YORK,NY 10027. RP SEDLACEK, AJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 51 TC 41 Z9 41 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 MAY 15 PY 1991 VL 94 IS 10 BP 6483 EP 6490 DI 10.1063/1.460277 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FL001 UT WOS:A1991FL00100014 ER PT J AU SONNENFROH, DM MACDONALD, RG LIU, K AF SONNENFROH, DM MACDONALD, RG LIU, K TI A CROSSED-BEAM STUDY OF THE STATE-RESOLVED INTEGRAL CROSS-SECTIONS FOR THE INELASTIC-SCATTERING OF OH(CHI-2-PI) WITH CO AND N2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COLLISIONS INVOLVING MOLECULES; LAMBDA-DOUBLET PROPENSITIES; LASER-INDUCED-FLUORESCENCE; FINE-STRUCTURE TRANSITIONS; ROTATIONAL ENERGY-TRANSFER; SHELL DIATOMIC-MOLECULES; RARE-GAS COLLISIONS; ELECTRONIC STATES; REACTION DYNAMICS; BIMOLECULAR REACTIONS AB State-resolved cross sections for the inelastic scattering of OH(X2-PI) with CO and N2 have been measured in a crossed molecular beam apparatus over the energy range from 0.5 to 5.5 kcal mol-1. The magnitude and shape of the excitation functions for the same OH final states were virtually independent of the two targets except near threshold. Both spin-orbit conserving and spin-orbit changing transitions have been investigated. Cross sections for spin-orbit changing transitions of large DELTA-N were approximately the same magnitude as those for spin-orbit conserving transitions. For small DELTA-N, however, the spin-orbit conserving transitions became more favorable. The LAMBDA-doublet ratio, PI(A')/PI(A"), in the PI-3/2 (F1) manifold differed from unity only for the N2 target for which the ratio became increasingly larger than unity as N' increased. The observed fine-structure effects were nearly the same as those from the corresponding (reverse) reactive collisions, and a close connection between the inelastic and reactive events has been conjectured. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Liu, Kopin/F-7929-2012 NR 92 TC 58 Z9 58 U1 1 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1991 VL 94 IS 10 BP 6508 EP 6518 DI 10.1063/1.460279 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FL001 UT WOS:A1991FL00100017 ER PT J AU POLLOCK, EL KOCH, SW AF POLLOCK, EL KOCH, SW TI PATH-INTEGRAL STUDY OF EXCITONS AND BIEXCITONS IN SEMICONDUCTOR QUANTUM DOTS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SHAPE; STATE AB Computational path integral methods have been used to study the excitonic properties of an effective mass quantum dot model. The results are compared to those of variational calculations. The variational method, using a free particle basis, accurately gives the ground and low lying excited state properties for small radii dots where the kinetic energy dominates over the Coulomb interaction. The path integral approach, which is not restricted to small radii dots, gives a thermal average over states. One thermal effect noted for this model is an inversion of the surface charge layer with temperature due to the competition between thermal and Coulomb energies. At high temperature, where Coulomb effects are secondary, the thermal deBroglie wavelength sets the scale for the density variation near a surface and thus the heavier holes approach the surface more closely than the electrons. As the temperature is lowered the now more important Coulomb binding causes the holes to be cushioned away from the surface by the electron cloud. This inversion temperature decreases as the dot radius increases. Both calculations predict increasing biexciton binding energy with decreasing dot size. C1 UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. RP POLLOCK, EL (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 9 TC 25 Z9 25 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 MAY 15 PY 1991 VL 94 IS 10 BP 6776 EP 6781 DI 10.1063/1.460254 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FL001 UT WOS:A1991FL00100045 ER PT J AU LI, Z FISHER, ES LIU, JZ NEVITT, MV AF LI, Z FISHER, ES LIU, JZ NEVITT, MV TI SINGLE-CRYSTAL ELASTIC-CONSTANTS OF CO-AL AND CO-FE SPINELS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB The elastic stiffness moduli of single-crystals CoAl2O4, a normal spinel, and CoFe2O4, an inverse spinel, have been determined by an ultrasonic method. The measured values are: C-11 = 290.5, C-12 = 170.3 and C44 = 138.6 GPa for CoAl2O4, and C-11 = 257.1, C-12 = 150.0 and C44 = 85.3 GPa for CoFe2O4. The elastic constants are compared with previously published data of other spinel single crystals and the results show that the cation valence and cation distribtion have little influence on the elastic properties of the spinel materials. C1 MAT CONSULTING SERV,MINNETONKA,MN 55343. RP LI, Z (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 14 TC 24 Z9 24 U1 0 U2 11 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD MAY 15 PY 1991 VL 26 IS 10 BP 2621 EP 2624 DI 10.1007/BF02387728 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA FM323 UT WOS:A1991FM32300012 ER PT J AU SIADATI, MH CHAWLA, KK FERBER, M AF SIADATI, MH CHAWLA, KK FERBER, M TI THE ROLE OF THE SNO2 INTERPHASE IN AN ALUMINA GLASS COMPOSITE - A FRACTOGRAPHIC STUDY SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID CERAMIC-MATRIX COMPOSITES; TOUGHNESS; STRENGTH AB The role of tin dioxide (SnO2) interphase for the alumina/glass composite system was investigated using fractography. Alumina (Al2O3) and glass form a strong chemical bond which is undesirable for toughness in a ceramic matrix composite. SnO2 interphase was incorporated to prevent this strong bond between alumina and glass. SnO2 was deposited on Al2O3 substrates via chemical vapour deposition and bonded with glass. The role of the interphase was then studied by characterizing the fracture surfaces of the bend test and special composite disc samples loaded in diametral compression. Bend tests results showed that the SnO2 interphase and/or the SnO2/Al2O3 interface acted as a plane of weakness. Secondary cracking at 90-degrees to the major crack direction was observed along this plane of weakness, which appears to be in accord with the Cook and Gordon model. Crack deflection and secondary cracking were also observed in the SnO2 region of the compression samples. These results indicate the suitability of SnO2 interphase for the alumina/glass composite system. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP SIADATI, MH (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801, USA. NR 22 TC 12 Z9 12 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD MAY 15 PY 1991 VL 26 IS 10 BP 2743 EP 2749 DI 10.1007/BF02387745 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA FM323 UT WOS:A1991FM32300029 ER PT J AU KRISTENSSON, G KRUEGER, RJ WINTHER, RC AF KRISTENSSON, G KRUEGER, RJ WINTHER, RC TI EXISTENCE AND CONSTRUCTION OF SOLUTIONS OF DISSIPATIVE INVERSE PROBLEMS SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article ID WAVE-EQUATION; TIME DOMAIN; SCATTERING OPERATORS C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP KRISTENSSON, G (reprint author), LUND INST TECHNOL,DEPT ELECTROMAGNET THEORY,S-22100 LUND,SWEDEN. NR 8 TC 3 Z9 3 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 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD MAY 15 PY 1991 VL 157 IS 2 BP 542 EP 554 DI 10.1016/0022-247X(91)90105-9 PG 13 WC Mathematics, Applied; Mathematics SC Mathematics GA FV044 UT WOS:A1991FV04400016 ER PT J AU TRACY, JG AF TRACY, JG TI STATUS OF THE ISOTOPE ENRICHMENT PROGRAM AT OAK-RIDGE-NATIONAL-LABORATORY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC AB The objectives of the isotope enrichment program at the Oak Ridge National Laboratory are to prepare and distribute electromagnetically separated stable isotopes to the research, medical and industrial communities on a worldwide basis. Topics discussed in this presentation include (1) a review of facility modifications, (2) current facility capabilities, (3) enrichment processes, and (4) final product distribution. An update on alternative separations methods to augment the electromagnetic separations process is covered, as well as special services that are available for providing custom materials to meet special applications. Recent changes in U.S. Department of Energy policy that impact the nation's isotope and isotope-related programs are summarized, with special emphasis on the effects on isotope enrichment, radioisotope production, target fabrication, pricing, and marketing and distribution of stable isotopes. RP TRACY, JG (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 3 EP 8 DI 10.1016/0168-9002(91)90756-G PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800003 ER PT J AU BORDEN, MJ ADAMSON, GE JOHNSON, RN NICAISE, WF AF BORDEN, MJ ADAMSON, GE JOHNSON, RN NICAISE, WF TI LONG-LIFE CARBON-FIBER-SUPPORTED CARBON STRIPPER FOILS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC AB Significantly increased stripper foil lifetimes have resulted from the use of carbon fibers to suspend a carbon stripper foil in an 800 MeV proton beam. Two carbon foils, each 16 mm x 16 mm and 100-mu-g/cm2, were superimposed on each other to produce an equivalent 200-mu-g/cm2 "postage stamp" foil which was then sandwiched between two fine grids composed of 4-5-mu-m diameter carbon fibers. The carbon foils were made by electron-beam evaporation-condensation techniques. The "postage stamp" foil survived irradiation with 800 MeV protons at a flux of 6.6 x 10(16) cm-2 s-1 to a fluence of 1.1 x 10(23) protons/cm2. The effective lifetime of the foil was determined by reduced stripping efficiency due to foil shrinkage. Compared to previously used carbon foils, the new foil extended stripper lifetimes by up to 300% and reduced beam losses by 30%. This allowed an increase of average stored beam current by 30% and decreased radiation exposure to operations personnel by one third, for foil changes. C1 WESTINGHOUSE HANFORD CO,RICHLAND,WA 99352. RP BORDEN, MJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MS-H838,LOS ALAMOS,NM 87544, USA. NR 2 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 63 EP 68 DI 10.1016/0168-9002(91)90765-I PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800012 ER PT J AU FOWLER, MM GURSKY, JC WILHELMY, JB AF FOWLER, MM GURSKY, JC WILHELMY, JB TI PREPARATION OF ACTINIDE TARGETS AND SOURCES USING NONAQUEOUS ELECTRODEPOSITION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC ID ORGANIC SOLUTIONS; FISSION AB Application of the method of "molecular plating" to prepare actinide targets suitable for accelerator bombardment is presented. Two example applications involving Th-229 and Es-254 are discussed along with the merits and liabilities of the method. RP FOWLER, MM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 7 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 99 EP 101 DI 10.1016/0168-9002(91)90770-Q PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800017 ER PT J AU CAI, SY GHIORSO, A HOFFMAN, DC AF CAI, SY GHIORSO, A HOFFMAN, DC TI THE PREPARATION OF ACCELERATOR TARGETS BY EVAPORATION OF ACETATE ORGANIC SOLUTIONS IN THE PRESENCE OF NH3 GAS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC ID ELECTRODEPOSITION AB The chemical methods described in this paper have been developed for the preparation of isotopic targets for bombardment by accelerator-produced ions. Three systems are compared: nitrate-, chloride-, and acetate-organic solutions. The best method was found to be the metal acetate-organic solution system, evaporated on the substrate to dryness in the presence of ammonia gas. A detailed procedure is given for this method. The targets obtained by the acetate-organic solution system are uniform and adherent. thicknesses from a few-mu-g/cm2 to several mg/cm2. The process is simple and fast. RP CAI, SY (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 18 TC 0 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 141 EP 145 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800024 ER PT J AU THOMAS, GE GREENE, JP MAIERKOMOR, P LEONARD, RH AF THOMAS, GE GREENE, JP MAIERKOMOR, P LEONARD, RH TI CHARACTERISTICS OF VARIOUS ELECTRON-BEAM SOURCES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC AB Various changes have been made in two electron beam sources to make them more suitable for target preparation. The beam spot size has been made more flexible and the accessibility to some of the component parts has been improved. C1 TECH UNIV MUNICH,W-8046 GARCHING,GERMANY. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. RP THOMAS, GE (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 3 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 MAY 15 PY 1991 VL 303 IS 1 BP 162 EP 164 DI 10.1016/0168-9002(91)90781-K PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800028 ER PT J AU GREENE, JP THOMAS, GE AF GREENE, JP THOMAS, GE TI THE PRODUCTION OF MOLYBDENUM TARGETS FOR HEAVY-ION EXPERIMENTS BY ELECTRON-BEAM EVAPORATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC AB Self-supporting targets of Mo-92, Mo-98, with thicknesses of 100 and 200-mu-g/cm2, were prepared by electron beam gun evaporation. Substrate heating proved crucial for the production of these foils. The numerous parting agents explored will be discussed. Targets of Mo-92, Mo-98 were also prepared on carbon backings of various thicknesses. Problems encountered in the production of 100-200-mu-g/cm2 thick self-supporting and carbon-backed Mo targets for reactions with heavy ions are discussed. RP GREENE, JP (reprint author), ARGONNE NATL LAB,DIV PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 13 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 165 EP 167 DI 10.1016/0168-9002(91)90782-L PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800029 ER PT J AU KOEHLER, PE OBRIEN, HA GURSKY, JC AF KOEHLER, PE OBRIEN, HA GURSKY, JC TI RADIOACTIVE TARGETS FOR NUCLEAR ASTROPHYSICS RESEARCH AT LANSCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC ID CROSS-SECTION; NEUTRON-CAPTURE; S-PROCESS AB During the past few years we have made measurements of (n, p) and (n, alpha) cross sections on several radioactive nuclei of importance to nuclear astrophysics. The measurements were made at the Manuel Lujan, Jr. Neutron Scattering Center (LANSCE) from thermal neutron energy to approximately 100 keV. Successful measurements have been completed on the radioisotopes Be-7, Na-22 and Cl-36 while preliminary data have been taken on targets of Mn-54 and Fe-55. Similar measurements have also been made on the stable isotopes N-14, O-17 and Cl-35. We are currently assembling a 4-pi barium fluoride (BaF2) detector which will allow us to expand our program to (n, gamma) measurements. The (n, gamma) (and in some cases future (n, p)) measurements will require targets with higher specific activity and greater chemical purity than we have so far been able to use. We discuss the fabrication techniques used for the samples produced so far, the requirements the future (n, gamma) targets must meet and our current plans for producing them, and the physics motivations for the measurements. RP KOEHLER, PE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. OI Koehler, Paul/0000-0002-6717-0771 NR 21 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 182 EP 186 DI 10.1016/0168-9002(91)90785-O PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800032 ER PT J AU GOBBY, PL BARTHELL, BL GOMEZ, VM MOORE, JE AF GOBBY, PL BARTHELL, BL GOMEZ, VM MOORE, JE TI COATING TECHNIQUES USED IN TARGET FABRICATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC AB A review of coating techniques used to fabricate targets and experimental components is presented. Coating techniques include physical vapor deposition, chemical vapor deposition, electroplating and dip coating. In all cases the substrate or mandrel material is removed from the coating to result in the final part. RP GOBBY, PL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 5 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP 187 EP 191 DI 10.1016/0168-9002(91)90786-P PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800033 ER PT J AU MUENCHAUSEN, RE FOLTYN, SR NOGAR, NS ESTLER, RC PETERSON, EJ WU, XD AF MUENCHAUSEN, RE FOLTYN, SR NOGAR, NS ESTLER, RC PETERSON, EJ WU, XD TI LASER-INDUCED TARGET MODIFICATION EFFECTS ON PULSED LASER DEPOSITIONS OF Y-BA-CU-O SUPERCONDUCTING THIN-FILMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15TH WORLD CONF OF THE INTERNATIONAL NUCLEAR TARGET SAFETY DEVELOPMENT SOC : SPECIAL HIGH PURITY MATERIALS AND TARGETS CY SEP 10-14, 1990 CL SANTA FE, NM SP INT NUCL TARGET SAFETY DEV SOC ID ABLATION; YBA2CU3O7-DELTA; EVAPORATION; SRTIO3 AB Target modifications due to laser irradiation during the pulsed laser deposition of high-T(c) YBa2Cu3O7-x thin films were studied. Although phase segregation occurs on the target surface as the formation of yttrium-rich phases results in a pronounced decrease in the overall evaporation rate, the corresponding evaporant stoichiometry, as measured in the deposited film, remains unchanged. Deposition rate dependence on laser fluence and background gas pressure were also determined for evaporations from conditioned targets. RP MUENCHAUSEN, RE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 2 Z9 2 U1 2 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 MAY 15 PY 1991 VL 303 IS 1 BP 204 EP 207 DI 10.1016/0168-9002(91)90789-S PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800036 ER PT J AU GOBBY, PL AF GOBBY, PL TI SPECIAL HIGH-PURITY MATERIALS AND TARGETS - PROCEEDINGS OF THE 15TH WORLD CONFERENCE OF THE INTERNATIONAL-NUCLEAR-TARGET-DEVELOPMENT-SOCIETY SANTA-FE, NM, USA, SEPTEMBER 10-14, 1990 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Editorial Material RP GOBBY, PL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1991 VL 303 IS 1 BP R7 EP R7 DI 10.1016/0168-9002(91)90754-E PG 1 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FR338 UT WOS:A1991FR33800001 ER PT J AU KWEI, GH CANFIELD, PC FISK, Z THOMPSON, JD VONDREELE, RB AF KWEI, GH CANFIELD, PC FISK, Z THOMPSON, JD VONDREELE, RB TI STRUCTURE OF THE NEW 1201 LEAD CUPRATE SUPERCONDUCTOR SO PHYSICA C LA English DT Article ID COPPER-OXIDE SUPERCONDUCTORS; CRYSTAL-STRUCTURE; NEUTRON POWDER; TC; DIFFRACTION; TEMPERATURE; OXIDATION; SYSTEM; SINGLE; OXYGEN AB The structure of the newly discovered "1201" lead cuprate superconductor (Pb, Cu)(Sr, La)2CuO5-delta, with T(c) = 27.5 K at onset and a shielding fraction 38% at 5 K and 10 Oe, has been determined using neutron powder diffraction. The structure is similar to the other 1201 materials TlBa1.2La0.8CuO5 and Tl0.5Pb0.5Sr2CuO5 (where the former superconductors with a T(c) of 52 K and the latter is not superconducting), belonging to the space group P4/mmm. The doping scheme in (Pb, Cu) (Sr, La)2CuO5-delta combines the doping scheme used in these two compounds, in that both the Tl and Sr sites are doped. The starting stoichiometry, the refined scale factors for the impurity phases and the refined site occupancies for oxygen suggests that the stoichiometry (relative to Cu) of the superconducting phase is Pb0.60Cu0.40Sr1.08La0.92CuO4.96. Calculation of the average hole concentration in these compounds from charge summation is difficult with these compounds because the Tl/Pb-O layers provide polarizable charge reservoirs that can participate in substantial covalent bonding and because of the probable mixed-valent nature of Tl and Pb. Nevertheless, bond valence sums calculated for the Cu ions in the CuO2 layers for the three 1201 cuprates do provide a correlation with the values of T(c) or the absence of superconductivity. RP KWEI, GH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 24 TC 9 Z9 9 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 MAY 15 PY 1991 VL 176 IS 1-3 BP 57 EP 63 DI 10.1016/0921-4534(91)90695-U PG 7 WC Physics, Applied SC Physics GA FQ010 UT WOS:A1991FQ01000008 ER PT J AU KLEMM, RA LIU, SH AF KLEMM, RA LIU, SH TI INTERLAYER PAIRING AND C-AXIS VERSUS AB-PLANE GAP ANISOTROPY IN HIGH-TC SUPERCONDUCTORS SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; SINGLE-CRYSTALS; MAGNETIC-FIELD; ENERGY-GAP; THIN-FILMS; YBA2CU3O7; BI2SR2CACU2O8 AB Interlayer BCS-like pairing in nearly two-dimensional superconductors with N = 1, 2 conducting layers per unit cell is investigated. For N = 1, the singlet DELTA-s and triplet DELTA-t order parameters have identical T(c)'s (T(cs) = T(ct)) and magnitudes, and the gap is isotropic. For N = 2, T(cs) greater-than-or-equal-to T(ct) and \DELTA-s\ greater-than-or-equal-to DELTA-t\. In region I of the parameters, the gap is anisotropic and nodeless for T < T(cs). In region II, the gap has nodes near T(cs), but is nodeless at low T. In a magnetic field, non-unitary states are possible. For N = 1 (2), intra-and interlayer pairing are completely (essentially) incompatible. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. NR 25 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 EI 1873-2143 J9 PHYSICA C JI Physica C PD MAY 15 PY 1991 VL 176 IS 1-3 BP 189 EP 194 DI 10.1016/0921-4534(91)90712-8 PG 6 WC Physics, Applied SC Physics GA FQ010 UT WOS:A1991FQ01000025 ER PT J AU ERPENBECK, JJ COHEN, EGD AF ERPENBECK, JJ COHEN, EGD TI EQUIPARTITION OF ENERGY IN A ONE-DIMENSIONAL MODEL OF DIATOMIC-MOLECULES .3. SOFT-INTERACTION CASE SO PHYSICAL REVIEW A LA English DT Article ID CLASSICAL PERTURBATION-THEORY; HIGH-FREQUENCY DEGREES; HOLONOMIC CONSTRAINTS; HAMILTONIAN-SYSTEMS; FREEDOM; REALIZATION; THRESHOLD; LIGHT AB The model of a one-dimensional, diatomic gas with harmonic intramolecular forces and soft intermolecular forces, introduced by Benettin, Galgani, and Giorgilli [Phys. Lett. A 120, 23 (1987)], is studied numerically for a set of initial conditions for various values of the vibrational frequency omega and the number of molecules N. The use of many trajectories, rather than a single one, as was done before, allows us to infer conclusions about the structure of the phase space of the system using statistical analysis of simple functions of the phase. Thus, for fixed omega and small N, the average vibrational energy differs from trajectory to trajectory, implying nonergodic behavior. However, these differences become statistically insignificant for large N, implying a transition to ergodicity. While this transition is not sharp, it occurs at larger N for increasing omega, due to the increasingly difficult exchange of energy between vibrational and translational degrees of freedom. The phase-space-averaged vibrational-energy time-autocorrelation function decays on two time scales for all frequencies considered, at least for N large enough that the system behaves ergodically. A rapid, Gaussian decay on the time scale of the mean free time is followed by a much slower, approximately stretched-exponential decay, due to interactions with adiabatic islands in phase space. This second time scale increases sharply with omega and is related to the increasingly slow, possibly Arnold-like, diffusion in phase space. C1 ROCKEFELLER UNIV,NEW YORK,NY 10021. RP ERPENBECK, JJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 1 Z9 1 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1991 VL 43 IS 10 BP 5308 EP 5320 DI 10.1103/PhysRevA.43.5308 PG 13 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300014 ER PT J AU VANSICLEN, CD WOLFER, WG AF VANSICLEN, CD WOLFER, WG TI VACANCY SUPERSATURATION IN RAPIDLY SOLIDIFIED METAL DROPLETS SO PHYSICAL REVIEW A LA English DT Article ID FOKKER-PLANCK EQUATIONS; PATH-INTEGRAL SOLUTIONS; NUMERICAL EVALUATION; CRYSTALLIZATION; MELT AB A self-consistent theory for vacancy entrapment in rapidly solidified metal droplets is presented. Supersaturation occurs when excess (nonequilibrium) vacancies created at the solidification front by the liquid-solid density difference are unable to diffuse back to interface before the droplet solidifies. The model consists of heat-conduction equations for the liquid and solid phases, a vacancy-diffusion equation, and boundary conditions at the internal and external surfaces that provide coupling between regions and generate the interface dynamics and and vacancy entrapment. Solutions to this system of equations are derived in the form of a set of integral equations that incorporate the boundary conditions as integral kernels. These are evaluated numerically to produce temperature and vacancy-concentration profiles for rapidly solidified droplets of various sizes, initial undercoolings, and convective cooling rates. For undercooled, micrometer-sized metal droplets, the model gives vacancy concentrations at solidification far in excess of equilibrium values. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP VANSICLEN, CD (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 14 TC 4 Z9 4 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1991 VL 43 IS 10 BP 5344 EP 5354 DI 10.1103/PhysRevA.43.5344 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300018 ER PT J AU CHEN, CP DAVIDSON, RC AF CHEN, CP DAVIDSON, RC TI CHAOTIC PARTICLE DYNAMICS IN FREE-ELECTRON LASERS SO PHYSICAL REVIEW A LA English DT Article ID AXIAL GUIDE FIELD; HELICAL-WIGGLER; MAGNETIC-FIELD; SIDEBAND INSTABILITY; ORBITS; WAVE; ACCELERATION AB The motion of a relativistic test electron in a free-electron laser can be altered significantly by the equilibrium self-field effects produced by the beam space charge and current and by the transverse spatial inhomogeneities in a realizable magnetic wiggler field. In a field configuration consisting of an ideal (constant-amplitude) helical-wiggler field and a uniform axial-guide field, it is shown in a model that the inclusion of self-field effects destroys the integrability of the particle equations of motion. Consequently, the group-I orbits and the group-II orbits become chaotic at sufficiently high beam density. An analytical estimate of the threshold value of the self-field parameter epsilon-s = omega-pb2/c2k(w)2 for the onset of chaos is obtained and found to be in good agreement with computer simulations. In addition, the effects of transverse spatial gradients in a realizable helical-wiggler field with three-dimensional spatial variations are investigated in the absence of an axial-guide field, but including self-field effects. For a thin electron beam (k(w)2r(b)2 <<1) and small wiggler field amplitude (a(w)2 << gamma-b2), it is shown that the motion is regular and confined radially provided epsilon-a < gamma-b(a)w2/(1 + a(w)2). However, because of the intrinsic nonintegrability of the motion, the regular region in phase space diminishes in size as the wiggler amplitude is increased. The threshold value of the wiggler amplitude for the onset of chaos is estimated analytically and confirmed by computer simulations for the special case where self-field effects are negligibly small. Moreover, it is shown that the particle motion becomes chaotic on a time scale comparable with the beam transit time through a few wiggler periods. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP CHEN, CP (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 31 TC 59 Z9 66 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1991 VL 43 IS 10 BP 5541 EP 5554 DI 10.1103/PhysRevA.43.5541 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300037 ER PT J AU MTINGWA, SK AF MTINGWA, SK TI THEORY OF THE ANISOTROPIC FERRITE WAKE-FIELD ACCELERATOR .1. AZIMUTHALLY SYMMETRICAL CASE SO PHYSICAL REVIEW A LA English DT Article ID DIELECTRIC STRUCTURES; PLASMA; BEAM AB The theory of the anisotropic ferrite wake-field accelerator is solved, wherein the ferrite is driven into saturation by a static magnetic field, resulting in a permeability tensor having off-diagonal elements. We show that it is possible to obtain a maximum accelerating gradient of 1.5 MV/[m(nC driver beam charge)] for a driver beam of 0.7-mm rms bunch length. This compares favorably with wake-field accelerators based upon other types of structures. C1 YEREVAN PHYS INST,YEREVAN 375036,ARMENIA,USSR. RP MTINGWA, SK (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 29 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1991 VL 43 IS 10 BP 5581 EP 5589 DI 10.1103/PhysRevA.43.5581 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300042 ER PT J AU CHIU, JT MTINGWA, SK AF CHIU, JT MTINGWA, SK TI THEORY OF THE ANISOTROPIC FERRITE WAKE-FIELD ACCELERATOR .2. HIGHER-ORDER MODES SO PHYSICAL REVIEW A LA English DT Article AB The theory of the anisotropic ferrite wake-field accelerator is solved for the case of any general angular mode m. The ferrite is driven into saturation by a static magnetic field, resulting in the permeability tensor having off-diagonal elements. Expressions for the radial and angular transverse forces are obtained. Finally, we give numerical examples showing that the transverse forces in the anisotropic ferrite wake-field accelerator are reduced as the static saturated magnetization is increased. RP CHIU, JT (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1991 VL 43 IS 10 BP 5590 EP 5596 DI 10.1103/PhysRevA.43.5590 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300043 ER PT J AU BOROVSKY, JE HANSEN, PJ AF BOROVSKY, JE HANSEN, PJ TI BREAKING OF THE 1ST ADIABATIC INVARIANTS OF CHARGED-PARTICLES IN TIME-DEPENDENT MAGNETIC-FIELDS - COMPUTER-SIMULATIONS AND THEORY SO PHYSICAL REVIEW A LA English DT Article AB The mechanics of the first adiabatic invariant-mu of nonrelativistic charged particles in time-dependent magnetic inductions B(t) are studied by means of computer simulations and analytic theory. Linear-ramp magnetic-induction profiles B = B0 + (DELTA-B/DELTA-t)t are utilized, as well as hyperbolic-tangent ramps and sine half-wave ramps. The change in mu that results from an induction change DELTA-B that occurs over a time DELTA-t is quantified for all values of DELTA-B and DELTA-t, as well as for all values of the particle position. It is found that the cases fall into two categories with very different mu-behavior: cases in which the change in the magnetic induction occurs over a time DELTA-t that is exactly equal to an integer number of gyroperiods (textbook case) or cases in which the change in the induction occurs over a time DELTA-t that is not equal to an integer number of gyroperiods (more general case). In both categories-mu is an adiabatic invariant, although the conservation of mu is much poorer in the latter category. It is pointed out that, in addition to the well-known constraints on DELTA-B and DELTA-t there is a constraint on the particle's initial position in the magnetic field if the change in the adiabatic invariant is to be kept small. C1 UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. RP BOROVSKY, JE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545, USA. NR 56 TC 9 Z9 9 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1991 VL 43 IS 10 BP 5605 EP 5627 DI 10.1103/PhysRevA.43.5605 PG 23 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300045 ER PT J AU ZHU, XD DAUM, W XIAO, XD CHIN, R SHEN, YR AF ZHU, XD DAUM, W XIAO, XD CHIN, R SHEN, YR TI COVERAGE DEPENDENCE OF SURFACE OPTICAL 2ND-HARMONIC GENERATION FROM CO/NI(110) - INVESTIGATION WITH A NONLINEAR-INTERFERENCE TECHNIQUE SO PHYSICAL REVIEW B LA English DT Article ID 2ND HARMONIC-GENERATION; ENERGY-LOSS SPECTROSCOPY; 110 NICKEL SURFACES; CARBON-MONOXIDE; THERMAL-DESORPTION; NI(110) SURFACE; ADSORBED CO; ADSORPTION; CHEMISORPTION; INTERFACE AB A nonlinear-optical-interference technique in surface second-harmonic generation is developed to measure directly the variation of surface nonlinear susceptibility of CO/Ni(110) as a function of the CO coverage. It is found that some of the susceptibility elements vary linearly with the coverage and others nonlinearly. A simple model suggests that the former are dominated by contributions from nearly free electrons, while the latter by contributions from the more localized electrons. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. FORSCHUNGSZENTRUM JULICH, INST GRENZFLACHENFORSCH & VAKUUMPHYS, W-5170 JULICH, GERMANY. RP ZHU, XD (reprint author), UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. NR 36 TC 27 Z9 27 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11571 EP 11580 DI 10.1103/PhysRevB.43.11571 PG 10 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300001 ER PT J AU ROSE, JH SHORE, HB AF ROSE, JH SHORE, HB TI BONDING ENERGETICS OF METALS - EXPLANATION OF TRENDS SO PHYSICAL REVIEW B LA English DT Article ID WORK FUNCTION; SURFACE; EXCHANGE; DENSITY AB Bonding energetics of elemental metals are explained by a uniform electron-gas model that has been modified to be in mechanical equilibrium. The trends in the work functions, cohesive energies, and chemical potentials are explained semiquantitatively. The same model explains the surface energies of the simple metals; however, it fails qualitatively for the surface energies of the transition metals. The approach retains the simplicity of the uniform electron gas; its only input parameter is the average electron density. Basically, we change the definition of the uniform electron gas slightly, so that the electron gas is in mechanical equilibrium at any particular specified density. The change is a rule for splitting the constant background charge when jellium is cleaved. The trends in the energetics of metals result. The concept of a bonding valence will be defined in order to treat the transition metals in terms of a uniform electron gas. Further, the model, due to its simplicity, may serve as a theoretical laboratory for the study of bonding in metals. For example, it presents the possibility of a nonperturbative calculation of the surface energy of the simple metals beyond the local-density approximation. It is also expected to be a better starting point than jellium for modeling the dynamical surface excitations of metals. C1 SAN DIEGO STATE UNIV, DEPT PHYS, SAN DIEGO, CA 92182 USA. RP IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 20 TC 40 Z9 40 U1 0 U2 3 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 MAY 15 PY 1991 VL 43 IS 14 BP 11605 EP 11611 DI 10.1103/PhysRevB.43.11605 PG 7 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300005 ER PT J AU WATSON, RE BENNETT, LH AF WATSON, RE BENNETT, LH TI CRYSTALLINE AND GLASSY PHASES OF TRANSITION-METAL METALLOID SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID ALLOYS; ND2FE14B AB Glasses formed in the Ni-P and Fe-B systems are known to be polymorphic. The crystalline phases in these systems display markedly different metalloid environments and a one-to-one relationship can be made between those environments and the glassy phases for Ni-P. It is the purpose of the present paper to explore the prospects for polymorphism in other transition-metal-rich metalloid glassy systems in which the metalloids are P, Si, B, C, and N. The known crystal structures of the phosphides, silicides, carbides, nitrides, and borides have been inspected using radical Voronoi (Wigner-Seitz) -cell constructs to deduce metalloid-site nearest-neighbor arrangements. The occurrence of differences, such as those obtained in Ni-P and Fe-B, is taken as indicative of possible polymorphism in the glasses. A list of such glasses has been constructed. It is seen that polymorphism is most likely to occur in the phosphides and silicides, and very unlikely in the nitrides. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP WATSON, RE (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 25 TC 17 Z9 17 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11642 EP 11652 DI 10.1103/PhysRevB.43.11642 PG 11 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300010 ER PT J AU EMIN, D AF EMIN, D TI SEMICLASSICAL SMALL-POLARON HOPPING IN A GENERALIZED MOLECULAR-CRYSTAL MODEL SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION; SOLIDS AB The thermally activated rates for high-temperature adiabatic and nonadiabatic small-(bi)polaron hopping are calculated for a generalization of Holstein's molecular-crystal model. In the expanded model a carrier occupying a molecule is coupled to many molecular vibrational modes rather than to just the single vibrational mode envisioned in the original model. This generalization of the molecular-crystal model does not significantly affect the semiclassical small-(bi)polaron jump rates. In particular, for the generalized model the hopping activation energy becomes a sum of contributions associated with each of the vibrational modes to which the carrier is coupled. The vibrational frequency that is the preexponential factor for adiabatic small-(bi)polaron hopping is the square root of the sum of the squares of the vibrational frequencies weighted by their relative contributions to the net hopping activation energy. RP EMIN, D (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 18 TC 34 Z9 35 U1 2 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11720 EP 11724 DI 10.1103/PhysRevB.43.11720 PG 5 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300018 ER PT J AU KHAN, FS BROUGHTON, JQ AF KHAN, FS BROUGHTON, JQ TI RELAXATION OF ICOSAHEDRAL-CAGE SILICON CLUSTERS VIA TIGHT-BINDING MOLECULAR-DYNAMICS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; C-60; SURFACES; STABILITY; SI AB We have used a tight-binding total-energy expression for silicon to study the stability and structure of relatively large silicon clusters. Relaxation is performed using a fictitious Lagrangian and molecular dynamics. Specifically, we have looked at the relaxation of 50-, 60-, and 70-atom spheroidal hollow (icosahedral-cage-structure) clusters. We find that these clusters are not stable and relax into structures which look like puckered balls. Our results show that the unrelaxed clusters are metallic and the relaxed clusters are insulating with the Fermi level passing between localized states. We have also examined the relaxation of large clusters (size of about 100 atoms) extracted from pure diamond, fcc, and sc bulk silicon. We find that the cohesive energies of the relaxed icosahedral-cage clusters are greater than the relaxed diamond clusters and less than the relaxed fcc clusters. We also find that a single layer of flat silicon graphite is not stable and relaxes into a nonplanar layer with properties very similar to those of the relaxed icosahedral clusters. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. USN,RES LAB,COMPLEX SYST THEORY GRP,WASHINGTON,DC 20375. RP KHAN, FS (reprint author), OHIO STATE UNIV,DEPT ELECT ENGN,COLUMBUS,OH 43210, USA. NR 23 TC 65 Z9 66 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11754 EP 11761 DI 10.1103/PhysRevB.43.11754 PG 8 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300023 ER PT J AU SELA, I WATKINS, DE LAURICH, BK SMITH, DL SUBBANNA, S KROEMER, H AF SELA, I WATKINS, DE LAURICH, BK SMITH, DL SUBBANNA, S KROEMER, H TI MODULATED PHOTOABSORPTION IN STRAINED GA1-XINXAS/GAAS MULTIPLE QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID LAYER SUPERLATTICES; OPTICAL-PROPERTIES; PHOTOREFLECTANCE; HETEROSTRUCTURES; ABSORPTION; MECHANISMS; GAAS AB Modulated photoabsorption measurements in strained Ga1-xInxAs/GaAs multiple quantum wells are presented. The modulating intensities vary from a few to about 10(5) W/cm2. The absorption near the first heavy-hole exciton is probed with a tunable Ti:sapphire laser. The modulating beam is either from the same Ti:sapphire laser as the test beam or from an Ar+-ion laser whose photon energy is much larger than the first heavy-hole exciton transition energy. A dramatic difference is observed in the modulated transmission spectra for the two modulating wavelengths. This difference in behavior can be explained as arising from screening of the residual surface electric field by Ar+-ion-laser excitation but not by Ti:sapphire laser excitation. The Ar+-ion laser creates high-energy carriers that are initially free to drift in the surface field before they are captured in the quantum wells. Carriers excited by the low-photon-energy Ti:sapphire laser are created in the quantum wells and therefore cannot effectively screen the surface field. We present a model based on surface-field screening and exciton saturation for Ar+-ion-laser modulation and exciton saturation alone for Ti:sapphire laser modulation that describes the observed results. C1 UNIV CALIF SANTA BARBARA, DEPT ELECT & COMP ENGN, SANTA BARBARA, CA 93106 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. NR 22 TC 7 Z9 7 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11884 EP 11892 DI 10.1103/PhysRevB.43.11884 PG 9 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300038 ER PT J AU SOOS, ZG KEPLER, RG AF SOOS, ZG KEPLER, RG TI 2-PHOTON-ABSORPTION SPECTRUM OF POLY(DI-NORMAL-HEXYLSILANE) FILMS SO PHYSICAL REVIEW B LA English DT Article ID POLYSILANES; STATES; EXCITONS; POLYMERS AB Two-photon-absorption (TPA) spectra of poly(di-n-hexylsilane) (PDHS) films are obtained from 605 to 410 nm at 295 and 11 K, where the intensity is an order of magnitude higher. A strong TPA band is found above 5 eV and interpreted in terms of interacting sigma-electrons in a Pariser-Parr-Pople (PPP) model. PPP models for (Si)n chains relate the excitonic (one-photon) absorption at E(g) = 3.4 in PDHS to the 4.2-eV TPA at the alternation gap and the high-energy TPA derived from two-electron excitations at E(g). The smaller alternation gap in pi-conjugated polymers and their intense TPA above E(g) also indicate correlated states and differ qualitatively from single-particle descriptions. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SOOS, ZG (reprint author), PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544, USA. NR 41 TC 56 Z9 56 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 MAY 15 PY 1991 VL 43 IS 14 BP 11908 EP 11912 DI 10.1103/PhysRevB.43.11908 PG 5 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300041 ER PT J AU PARK, JL CHEN, Y WILLIAMS, GP WILLIAMS, RT POGATSHNIK, GJ AF PARK, JL CHEN, Y WILLIAMS, GP WILLIAMS, RT POGATSHNIK, GJ TI LUMINESCENCE OF F+ CENTERS IN CAO CRYSTALS UNDER PULSED-LASER EXCITATION SO PHYSICAL REVIEW B LA English DT Article ID ALKALINE-EARTH OXIDES; MGO CRYSTALS; MAGNESIUM-OXIDE; HYDROGEN; STATES; CHARGE AB Luminescence of F+ centers (oxygen vacancies each with one electron) has been investigated in thermochemically reduced, electron-irradiated, and neutron-irradiated CaO crystals. Time-dependent emission spectra following laser excitation into the F+ absorption band at 351 nm were measured for the three types of crystals. We observed a fast component with a lifetime less-than-or-equal-to 10 ns and a slow decay attributed to charge trapping and transport. The intensity and decay kinetics of the F+ phosphorescence depended on the method by which the defects had been produced. Estimated gain coefficients for stimulated emission under pulsed laser pumping are less than 0.1 cm-1. These values are significantly smaller than the absorption coefficient at the emission wavelength. C1 WAKE FOREST UNIV,DEPT PHYS,WINSTON SALEM,NC 27109. SO ILLINOIS UNIV,DEPT PHYS,EDWARDSVILLE,IL 62026. RP PARK, JL (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 26 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11991 EP 11998 DI 10.1103/PhysRevB.43.11991 PG 8 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300051 ER PT J AU LIN, SY WEI, HP TSUI, DC KLEM, JF ALLEN, SJ AF LIN, SY WEI, HP TSUI, DC KLEM, JF ALLEN, SJ TI EXTREME G-FACTOR ANISOTROPY INDUCED BY STRAIN SO PHYSICAL REVIEW B LA English DT Note ID TWO-DIMENSIONAL HOLES; MAGNETIC-FIELDS; QUANTUM-WELLS; INVERSION LAYERS; ELECTRON-GAS; OSCILLATIONS; HETEROJUNCTIONS; ENHANCEMENT; RESONANCE AB Magnetotransport measurements as a function of B-field orientation are studied on p-type strained-layer (001) GaAs/In0.20Ga0.80As/GaAs quantum wells at temperatures from 4.2 to 0.4 K. It is shown that the two-dimensional holes are derived from the m(j) = +/- 3/2 subbands and that the Zeeman splitting between the m(j) = 3/2 and m(j) = -3/2 states of the same Landau level depends on the components of B perpendicular to the strained layer and not the total B. This g-factor anisotropy is shown to be a consequence of the large unaxial strain in the In0.20Ga0.80As layer. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. BELL COMMUN RES INC,RED BANK,NJ 08544. RP LIN, SY (reprint author), PRINCETON UNIV,DEPT ELECT ENGN,PRINCETON,NJ 08544, USA. RI Schaff, William/B-5839-2009 NR 25 TC 21 Z9 21 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 12110 EP 12113 DI 10.1103/PhysRevB.43.12110 PG 4 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300081 ER PT J AU ZHU, XJ LOUIE, SG AF ZHU, XJ LOUIE, SG TI QUASI-PARTICLE SURFACE BAND-STRUCTURE AND PHOTOELECTRIC THRESHOLD OF GE(111)-2X1 SO PHYSICAL REVIEW B LA English DT Note ID NORM-CONSERVING PSEUDOPOTENTIALS; DANGLING-BOND BAND; CHAIN MODEL; STATE BAND; PHOTOEMISSION; SEMICONDUCTORS; INSULATORS; GAAS(110); REFLECTIVITY; SI(111)2X1 AB The surface-state energies of the Ge(111)-2 x 1 surface are calculated using a quasiparticle self-energy approach. The surface structural parameters are determined through a local-density-functional total-energy minimization resulting in a buckled pi-bonded-chain geometry. The quasiparticle energies are computed using a first-order expansion of the electron self-energy operator in the screened Coulomb interaction with a model static dielectric matrix. Our calculated surface-state band gaps and dispersions of both the occupied and unoccupied surface states agree well with experiments. Further, the photoelectric threshold-phi is found to be 4.73 eV, compared to 4.74-4.80 eV obtained experimentally. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 37 TC 28 Z9 28 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 12146 EP 12149 DI 10.1103/PhysRevB.43.12146 PG 4 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300090 ER PT J AU SLUITER, M TURCHI, PEA AF SLUITER, M TURCHI, PEA TI PHASE-STABILITY IN TI-V AND TI-CR ALLOYS - A THEORETICAL INVESTIGATION SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL ALLOYS; ELECTRONIC-STRUCTURE; SUBSTITUTIONAL ALLOYS; DIAGRAMS; ORDER AB The phase stability of Ti-V and Ti-Cr alloys is examined within the context of an electronic-structure description. Substitutional alloys based on the bcc lattice are considered as well as the complex Laves phases. The relationship between the three Laves phases is examined in detail. Energies of mixing, effective pair interactions, and ultimately phase diagrams are computed and compared with experimental data. A metastable B2 type of structure is predicted in near-equiatomic Ti-Cr alloys, whereas Ti-V alloys exhibit a clear tendency towards phase separation. RP SLUITER, M (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV CONDENSED MATTER,L-268,LIVERMORE,CA 94550, USA. RI Sluiter, Marcel/E-6086-2010 OI Sluiter, Marcel/0000-0002-6514-4318 NR 27 TC 31 Z9 31 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 15 BP 12251 EP 12266 DI 10.1103/PhysRevB.43.12251 PG 16 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300010 ER PT J AU SPECHT, ED ICE, GE PETERS, CJ SPARKS, CJ LUCAS, N ZHU, XM MORET, R MORKOC, H AF SPECHT, ED ICE, GE PETERS, CJ SPARKS, CJ LUCAS, N ZHU, XM MORET, R MORKOC, H TI X-RAY-DIFFRACTION MEASUREMENT OF INTERFACE STRUCTURE IN GAAS/SI(001) SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-BEAM EPITAXY; GAAS AB We have developed an x-ray-diffraction technique that provides depth sensitivity to the near-interface region of a thick, nonregistered film. By measuring the intensity profiles along the Si[00l] substrate crystal truncation rods, we compare the diffraction from the Si/GaAs interface with a model based on a grid of misfit dislocations. We find that the interface atoms have a root-mean-square displacement of 1.09 +/- 0.10 angstrom and that the interface has a roughness of 2.9 +/- 1.0 angstrom. The diffraction indicates an anomalously small strain perpendicular to the interface in the GaAs near the interface. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. UNIV ILLINOIS,COORDINATED SCI LAB,URBANA,IL 61801. RP SPECHT, ED (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009 OI Specht, Eliot/0000-0002-3191-2163 NR 22 TC 23 Z9 23 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 15 BP 12425 EP 12430 DI 10.1103/PhysRevB.43.12425 PG 6 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300029 ER PT J AU ZOUBOULIS, ES GRIMSDITCH, M AF ZOUBOULIS, ES GRIMSDITCH, M TI RAMAN-SCATTERING IN DIAMOND UP TO 1900-K SO PHYSICAL REVIEW B LA English DT Article ID TEMPERATURE-DEPENDENCE; OPTICAL PHONONS; SPECTRUM; SILICON AB The temperature dependence of the zone-center optical phonon of diamond has been investigated up to 1900 K using Raman scattering. Our frequencies agree well with the first measurements of the temperature dependence of this mode but are found to fall halfway between those obtained in two later determinations up to 1000 K. Up to approximately 1000 K, there is a noticeable nonlinearity in the frequency changes; above approximately 1000 K the frequency change is almost linear with temperature. The measured positions and widths are also compared with theoretical calculations. RP ZOUBOULIS, ES (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 15 TC 95 Z9 95 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 15 BP 12490 EP 12493 DI 10.1103/PhysRevB.43.12490 PG 4 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300037 ER PT J AU KEPLER, RG SOOS, ZG AF KEPLER, RG SOOS, ZG TI ELECTRONIC EXCITATIONS OF POLY(METHLPHENYLSILANE) FILMS SO PHYSICAL REVIEW B LA English DT Article ID CHARGE-TRANSFER TRANSITIONS; CONJUGATED POLYMERS; POLYSILANES; SPECTRA; EXCITONS; ELECTROREFLECTANCE; TRANSPORT; CRYSTALS; PTS AB We report electroabsorption (EA), two-photon absorption (TPA), and the spectrum for charge-carrier generation in thin films of poly(methylphenylsilane) (PMPS). The one-photon absorption to a singlet exciton, which begins at E(g) = 3.5 eV, appears in EA and indicates a polarizability change of 1.8 X 10(-22) cm3. The onset around 4.6 eV of direct generation of charge carriers by photons defines the interband gap E(b) and correlates with an EA feature at 4.65 eV that we associate with charge transfer between polymer segments. The TPA around 4.4 eV is to the second 1A(g) state and gives the alternation gap E(a), while the broad TPA above 5 eV is assigned to an even-parity state derived from exciting two electrons across E(g). A Pariser-Parr-Pople model for sigma-conjugation in polysilanes accounts for E(g), for polarizability changes, for TPA, and for the singlet-triplet gap E(t) in terms of correlated states. We contrast the spectra of amorphous PMPS with films of poly(di-n-hexylsilane), whose side groups are ordered at low temperature, and compare EA spectra in polysilanes with EA in crystalline organic solids and wideband semiconductors. C1 PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544. RP KEPLER, RG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 46 TC 51 Z9 51 U1 3 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 15 BP 12530 EP 12537 DI 10.1103/PhysRevB.43.12530 PG 8 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300042 ER PT J AU KRESS, JD VOTER, AF AF KRESS, JD VOTER, AF TI INTERATOMIC POTENTIAL FOR DIRECTIONAL BONDING - THE ROTATED-2ND-MOMENT APPROXIMATION SO PHYSICAL REVIEW B LA English DT Note ID EMBEDDED-ATOM METHOD; TRANSITION-METALS; ENERGIES AB An interatomic potential is presented, the rotated-second-moment approximation (RSMA), which incorporates directional bonding through energy moments evaluated over directional atomic orbitals. When nondirectional orbitals are used, RSMA reduces to the standard SMA (which is equivalent to the embedded-atom method) and is thus capable of describing metallic systems. A model RSMA potential is constructed for 3d transition metals, with only first-neighbor shell interactions, which can correctly predict the experimental trend in the relative stability of the fcc and hcp structures. RP KRESS, JD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET T-12 MS B268,LOS ALAMOS,NM 87545, USA. OI Voter, Arthur/0000-0001-9788-7194 NR 22 TC 10 Z9 10 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 15 BP 12607 EP 12610 DI 10.1103/PhysRevB.43.12607 PG 4 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300051 ER PT J AU FULLER, GM MALANEY, RA AF FULLER, GM MALANEY, RA TI NEW COSMOLOGICAL LIMIT ON NEUTRINO MASS SO PHYSICAL REVIEW D LA English DT Article ID PHASE-TRANSITION; PRIMORDIAL NUCLEOSYNTHESIS; GAUGE-THEORY; UNIVERSE; NUMBER AB We show that considerations of the equilibration of right- and left-handed neutrino seas in the early Universe and the well-known He-4 constraint on the number of relativistic degrees of freedom extant at the nucleosynthesis epoch lead to a new limit on the Dirac neutrino mass of m-mu <<300 keV. This constraint would apply to any neutrino so long as it had a purely Dirac mass and a life-time exceeding the nucleosynthesis time scale. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP FULLER, GM (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. RI Malaney, Robert/F-6588-2012 OI Malaney, Robert/0000-0001-9672-5601 NR 39 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 MAY 15 PY 1991 VL 43 IS 10 BP 3136 EP 3139 DI 10.1103/PhysRevD.43.3136 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FM345 UT WOS:A1991FM34500005 ER PT J AU SALOPEK, DS AF SALOPEK, DS TI NONLINEAR SOLUTIONS OF LONG-WAVELENGTH GRAVITATIONAL-RADIATION SO PHYSICAL REVIEW D LA English DT Article ID INFLATIONARY UNIVERSE; DENSITY; GRAVITY AB In a significant improvement over homogeneous minisuperspace models models, it is shown that the classical nonlinear evolution of inhomogeneous scalar fields and the metric is tractable when the wavelength of the fluctuations is larger than the Hubble radius. Neglecting second-order spatial gradients, one can solve the energy constraint as well as the evolution equations by invoking a transformation to new canonical variables. The Hamilton-Jacobi equation is separable and complete solutions are given for gravitational radiation and multiple scalar fields interacting through an exponential potential. Although the time parameter is arbitrary, the natural choice is the determinant of the three-metric. The momentum constraint may be simply expressed in terms of the new canonical variables which define the spatial coordinates. The long-wavelength analysis is essential for a proper formulation of stochastic inflation which enables one to model non-Gaussian primordial fluctuations for structure formation. RP SALOPEK, DS (reprint author), NASA,FERMILAB ASTROPHYS CTR,POB 500,MS-209,BATAVIA,IL 60510, USA. NR 30 TC 32 Z9 32 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1991 VL 43 IS 10 BP 3214 EP 3233 DI 10.1103/PhysRevD.43.3214 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FM345 UT WOS:A1991FM34500014 ER PT J AU COOPER, F JONES, HF SIMMONS, LM AF COOPER, F JONES, HF SIMMONS, LM TI COMPARISON OF SOME VARIATIONAL STRATEGIES USED IN FIELD-THEORY SO PHYSICAL REVIEW D LA English DT Article ID NONSTANDARD EXPANSION TECHNIQUES; PERTURBATIVE SCHEME; SYMMETRY BREAKING; DELTA-EXPANSION; LARGE-N; MODEL AB Recently two variational strategies have been applied to the standard and linear delta expansions for quantum field theories. These strategies, both of which improve the accuracy of the expansions, have the property that for N self-interacting fields at large N the lowest-order delta expansion improved by the variational strategy gives the exact large-N result. In this article, we study, in the context of supersymmetric quantum mechanics, the numerical accuracy of the improved delta expansions when calculated to large order in delta and compare them with the accuracy of the large-N expansion. We find that the usual delta expansion is the most accurate, followed by the linear delta expansion. The large-N expansion, analytically continued to N = 1, is the least accurate method of the three. C1 UNIV LONDON IMPERIAL COLL SCI & TECHNOL,DEPT PHYS,LONDON SW7 2BZ,ENGLAND. SANTE FE INST,SANTA FE,NM 87501. RP COOPER, F (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,MS B285,LOS ALAMOS,NM 87545, USA. NR 19 TC 4 Z9 4 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1991 VL 43 IS 10 BP 3396 EP 3399 DI 10.1103/PhysRevD.43.3396 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FM345 UT WOS:A1991FM34500029 ER PT J AU MANE, SR AF MANE, SR TI VACUUM STRESS-ENERGY TENSOR OF THE ELECTROMAGNETIC-FIELD IN ROTATING FRAMES - COMMENT SO PHYSICAL REVIEW D LA English DT Letter ID ELECTRONS AB Hacyan and Sarmiento have found that an observer accelerating in a circle will detect a nonzero energy flux (Poynting vector) caused by the vacuum electromagnetic fluctuations in that frame. I wish to suggest that the above flux is related to synchrotron radiation. I treat only the leading order of perturbation theory. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1991 VL 43 IS 10 BP 3578 EP 3579 DI 10.1103/PhysRevD.43.3578 PG 2 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FM345 UT WOS:A1991FM34500052 ER PT J AU SKOTHEIM, TA LEE, HS HALE, PD KARAN, HI OKAMOTO, Y SAMUELSON, L TRIPATHY, S AF SKOTHEIM, TA LEE, HS HALE, PD KARAN, HI OKAMOTO, Y SAMUELSON, L TRIPATHY, S TI DERIVATIZED POLYPYRROLE LANGMUIR-BLODGETT-FILMS - APPLICATIONS TO BIOELECTRONICS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER AB A new class of derivatized conducting polypyrrole Langmuir-Blodgett films have been prepared with electroactive groups covalently attached to alkyl-pyrroles. Specifically, we have studied copolymers formed by polymerizing mixed 3-alkyl pyrrole and ferrocene-3-alkyl pyrrole (Fc-Py) at the air-water interface, with the subphase containing FeCl3. When the Fc-Py containing LB film is deposited on an electrode surface, the resulting derivatized electrode can be used for reoxidizing reduced flavin enzymes such as glucose oxidase. C1 MOLTECH CORP,STONY BROOK,NY 11794. CUNY MEDGAR EVERS COLL,BROOKLYN,NY 11225. POLYTECH INST NEW YORK,BROOKLYN,NY 11201. UNIV LOWELL,LOWELL,MA 01854. RP SKOTHEIM, TA (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 3 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 15 PY 1991 VL 42 IS 1-2 BP 1433 EP 1437 DI 10.1016/0379-6779(91)91871-7 PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV276 UT WOS:A1991FV27600004 ER PT J AU KEPLER, RG SOOS, ZG AF KEPLER, RG SOOS, ZG TI THE ELECTROABSORPTION SPECTRUM AT THE FREE CARRIER BAND-GAP IN POLY(METHYL PHENYLSILANE) SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID POLYSILANES; TRANSPORT; POLYMERS AB We have measured the electroabsorption spectrum in poly(methylphenylsilane) at 95 K. A feature observed at 4.65 eV is assigned to the conduction band of poly(methylphenylsilane) and resembles an electroabsorption signal in polydiacetylene-PCHD crystals. C1 PRINCETON UNIV,PRINCETON,NJ 08544. RP KEPLER, RG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 15 PY 1991 VL 42 IS 1-2 BP 1563 EP 1566 DI 10.1016/0379-6779(91)91899-L PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV276 UT WOS:A1991FV27600032 ER PT J AU WEI, X HAN, SG WONG, KS HESS, BC ZHENG, LX VARDENY, ZV NI, QX SHINAR, J PANG, Y IJADIMAGHSOODI, S BARTON, TJ GRIGORAS, S AF WEI, X HAN, SG WONG, KS HESS, BC ZHENG, LX VARDENY, ZV NI, QX SHINAR, J PANG, Y IJADIMAGHSOODI, S BARTON, TJ GRIGORAS, S TI OPTICAL-PROPERTIES OF POLYDIETHYNYLSILANES - A QUASI (AB)X POLYMER SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID RESONANT RAMAN-SCATTERING; EXCITATIONS AB We have measured optical absorption, resonant Raman scattering (RRS), cw photomodulation (PM), picosecond transient PM and degenerate four-wave mixing, in I2-doped and undoped polydiethynylsilanes (PDES): [(HC = C)2SiR2]x, where R = alkyl, phenyl, etc. Our measurements show that the PDES backbone structure consists of units of four-membered rings alternatively connected to CH and SiR2 units and thus it can be regarded as an almost degenerate ground state (AB-AB-approximately)x conducting polymer. As such, it supports A and B solitons as primary excitations; these have been observed in doping and photoexcitation spectra. The non-linear chi-(3) value at 625 nm was measured to be 3 x 10(-9) esu, one of the largest measured in conjugated polymers. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS & CHEM,AMES,IA 50011. DOW CORNING CORP,MIDLAND,MI 48686. RP WEI, X (reprint author), UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112, USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 15 PY 1991 VL 42 IS 1-2 BP 1583 EP 1586 DI 10.1016/0379-6779(91)91903-N PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV276 UT WOS:A1991FV27600036 ER PT J AU MAZUMDAR, S CAMPBELL, DK LIN, HQ AF MAZUMDAR, S CAMPBELL, DK LIN, HQ TI A NOVEL VALENCE-TRANSITION MODEL FOR THE PRESSURE-INDUCED METAL-TO-INSULATOR TRANSITION IN THE ORGANIC CONDUCTOR (2,5DM-DCNQI)2CU SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NON LINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. RP MAZUMDAR, S (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 15 PY 1991 VL 42 IS 1-2 BP 1859 EP 1859 DI 10.1016/0379-6779(91)91968-G PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV276 UT WOS:A1991FV27600101 ER PT J AU WANG, HH CARLSON, KD GEISER, U KINI, AM SCHULTZ, AJ WILLIAMS, JM MONTGOMERY, LK KWOK, WK WELP, U VANDERVOORT, KG BORYSCHUK, SJ CROUCH, AVS KOMMERS, JM WATKINS, DM SCHIRBER, JE OVERMYER, DL JUNG, D NOVOA, JJ WHANGBO, MH AF WANG, HH CARLSON, KD GEISER, U KINI, AM SCHULTZ, AJ WILLIAMS, JM MONTGOMERY, LK KWOK, WK WELP, U VANDERVOORT, KG BORYSCHUK, SJ CROUCH, AVS KOMMERS, JM WATKINS, DM SCHIRBER, JE OVERMYER, DL JUNG, D NOVOA, JJ WHANGBO, MH TI NEW KAPPA-PHASE MATERIALS, KAPPA-(ET)2CU[N(CN)2]X, X = CL, BR AND I - THE SYNTHESIS, STRUCTURE AND SUPERCONDUCTIVITY ABOVE 11-K IN THE CL (TC = 12.8 K, 0.3 KBAR) AND.BR(TC = 11.6K) SALTS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID DITHIOLO) TETRATHIOFULVALENE TRIIODIDE>; NORMAL-PRESSURE SUPERCONDUCTIVITY; ORGANIC SUPERCONDUCTOR; MOLECULAR SUPERCONDUCTOR; ELECTRONIC-STRUCTURES; K-(BEDT-TTF)2CUBR; BETA-(BEDT-TTF)2I3; CONDUCTOR; CRYSTAL AB The syntheses, structures, selected physical properties, and band electronic structures of three copper (I) dicyanamide halide salts of bis(ethylenedithio)tetrathiafulvalene [kappa-(ET)2Cu[N(CN)2]X, where X = Cl, Br, and I] are discussed. X-ray crystallographic studies demonstrate that the three derivatives are isostructural. The bromide salt is an ambient pressure superconductor with an inductive onset at 11.6 K and a resistive onset at 12.5 K. kappa-(ET)2Cu[N(CN)2]Cl exhibits the highest reported superconducting transition temperature (T(c) = 12.8 K, 0.3 kbar) for an organic superconductor, once a semiconductor-semiconductor transition (42 K) is suppressed. The application of GE varnish or Apiezon N grease to crystals of kappa-(ET)2Cu[N(CN)2]Cl provides sufficient stress to induce superconductivity at "ambient pressure". Crystals of the iodide remain metallic to approximately 150 K, where they become weakly semiconductive. No sign of superconductivity was detected at pressures (hydrostatic and shearing) up to 5.2 kbar and at temperatures as low as 1.1 K. The band electronic structures of the three salts are essentially identical. The differences in superconducting properties are explained in terms of differences in lattice softness, which are strongly influenced by short C-H...donor and C-H...anion contacts. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. N CAROLINA STATE UNIV,RALEIGH,NC 27695. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP WANG, HH (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012; Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 19 TC 61 Z9 61 U1 3 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 15 PY 1991 VL 42 IS 1-2 BP 1983 EP 1990 DI 10.1016/0379-6779(91)91996-N PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV276 UT WOS:A1991FV27600129 ER PT J AU ALWAN, JJ HONIG, J FAVARO, ME BEERNINK, KJ KLATT, JL AVERBACK, RS COLEMAN, JJ BRYAN, RP AF ALWAN, JJ HONIG, J FAVARO, ME BEERNINK, KJ KLATT, JL AVERBACK, RS COLEMAN, JJ BRYAN, RP TI INDEX-GUIDED OPERATION IN NARROW STRIPE INGAAS-GAAS STRAINED-LAYER QUANTUM-WELL HETEROSTRUCTURE LASERS BY MEV OXYGEN IMPLANTATION SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMI-INSULATING LAYERS AB Stable index-guided operation of variable stripe strained-layer InGaAs-GaAs-AlGaAs lasers achieved by MeV oxygen implantation-induced disorder of the active region is demonstrated. Well-behaved near- and far-field patterns for lasers implanted with 5 X 10(16) cm-2 and 1 X 10(17) cm-2 oxygen are observed to be stable with increasing drive current. Comparison with unimplanted, oxide-defined stripe lasers fabricated from the same wafer indicates a dramatic improvement in emission characteristics as a result of the presence of a lateral real-index waveguide in the oxygen-disordered regions which is stronger than the carrier-induced antiguide present in unimplanted InGaAs-GaAs strained-layer lasers. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV ILLINOIS,COMPOUND SEMICOND MICROELECTR LAB,URBANA,IL 61801. RP ALWAN, JJ (reprint author), UNIV ILLINOIS,MAT RES LAB,208 N WRIGHT ST,URBANA,IL 61801, USA. RI Coleman, James/C-9703-2011 NR 15 TC 2 Z9 2 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2058 EP 2060 DI 10.1063/1.105009 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700002 ER PT J AU WOLF, D AF WOLF, D TI SURFACE-STRESS-INDUCED STRUCTURE AND ELASTIC BEHAVIOR OF THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID SUPERLATTICES AB Computer simulations of unsupported (111), (001), and (011) thin films of gold, using an embedded-atom-method potential, demonstrate a direct correlation between the bulk-surface stress and the film dimensions. The considerably more complex elastic behavior, by contrast, appears to be dominated by the atomic structure of the film surfaces, and not by the stress-induced anisotropic lattice parameter changes. RP WOLF, D (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 10 TC 36 Z9 38 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2081 EP 2083 DI 10.1063/1.105017 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700010 ER PT J AU CHANG, Y CHOU, SY KRAMER, J SIGMON, TW MARSHALL, AF WEINER, KH AF CHANG, Y CHOU, SY KRAMER, J SIGMON, TW MARSHALL, AF WEINER, KH TI FABRICATION OF PATTERNED GEXSI1-X/SI LAYERS BY PULSED LASER-INDUCED EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID HETEROJUNCTION BIPOLAR-TRANSISTOR; MOLECULAR-BEAM EPITAXY AB Selective growth of GexSi1-x on Si is demonstrated for the first time using a pulsed laser induced epitaxy technique, combined with either standard oxide or liftoff patterning processes. Two different dimensions of Ge0.12Si0.88/Si lateral wells are formed, 3.5-mu-m wide by 1700 angstrom deep, and 6-mu-m wide by 1300 angstrom deep. High-resolution transmission electron microscopy, combined with energy-dispersive x-ray imaging, reveals a well-defined two-dimensional (2D) Ge redistribution profile with no significant line or surface defects observed. The 2D Ge well distribution profiles, governed by heat and mass transport during the laser processing, are discussed. C1 STANFORD UNIV,DEPT ELECT ENGN,STANFORD,CA 94305. STANFORD UNIV,CTR MAT RES,STANFORD,CA 94305. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CHANG, Y (reprint author), STANFORD UNIV,SOLID STATE LAB,STANFORD,CA 94305, USA. NR 8 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2150 EP 2152 DI 10.1063/1.104989 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700033 ER PT J AU LILIENTALWEBER, Z SWIDER, W YU, KM KORTRIGHT, J SMITH, FW CALAWA, AR AF LILIENTALWEBER, Z SWIDER, W YU, KM KORTRIGHT, J SMITH, FW CALAWA, AR TI BREAKDOWN OF CRYSTALLINITY IN LOW-TEMPERATURE-GROWN GAAS-LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; DEFECTS AB A systematic study of the change in structural quality of as-grown GaAs layers deposited at temperatures between 180 and 210-degrees-C by molecular beam epitaxy was performed using transmission electron microscopy, double-crystal x-ray rocking curves, and particle-induced x-ray emission. We found that the crystal quality was correlated strongly with growth temperature near 200-degrees-C. The lattice parameter and the amount of As incorporated in the layer were observed to increase at lower growth temperatures. After exceeding a certain growth-temperature-dependent layer thickness, large densities of pyramidal-type defects are formed, which at lowest growth temperature result in the breakdown of crystallinity and in columnar polycrystalline growth. The lattice expansion is ascribed to the excess As in the layers. The mechanisms of breakdown of crystallinity are discussed. C1 MIT,LINCOLN LAB,LEXINGTON,MA 02173. RP LILIENTALWEBER, Z (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012; Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 11 TC 90 Z9 90 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2153 EP 2155 DI 10.1063/1.104990 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700034 ER PT J AU MILLER, TA OSTENSON, JE LI, Q SCHWARTZKOPF, LA FINNEMORE, DK RIGHI, J GLEIXNER, RA ZEIGLER, D AF MILLER, TA OSTENSON, JE LI, Q SCHWARTZKOPF, LA FINNEMORE, DK RIGHI, J GLEIXNER, RA ZEIGLER, D TI STRAIN TOLERANT MICROFILAMENTARY CONDUCTORS OF BI2SR2CA1CU2O8-DELTA SO APPLIED PHYSICS LETTERS LA English DT Article AB A highly strain tolerant family of conductors has been developed for the high-temperature superconductor Bi2Sr2Ca1Cu2O8-delta by fabricating a microfilamentary composite in which discontinuous filaments of the superconductors are separated from one another by very thin layers of Ag. The Ag provides a region of plastic flow and the strain tolerance. The Ag also provides barriers to supercurrent flow and to overcome these barriers long slender filaments of Bi(2212) are arranged to have enormous overlap areas perpendicular to the direction of average current flow. This requires filament length to diameter ratios of about 10 000 to 1 and Ag barrier thicknesses on the order of 20 nm. This permits high J(c) values even though the sample has a dense array of barriers. At 4.2 K and 0.3 T, critical current densities typically fall smoothly from 1000 to 800 A/cm2 as the strain increases from 0 to 1.6%. C1 BABCOCK & WILCOX CO,RES CTR,ALLIANCE,OH 44601. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP MILLER, TA (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 8 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2159 EP 2161 DI 10.1063/1.104992 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700036 ER PT J AU WU, XD DYE, RC MUENCHAUSEN, RE FOLTYN, SR MALEY, M ROLLETT, AD GARCIA, AR NOGAR, NS AF WU, XD DYE, RC MUENCHAUSEN, RE FOLTYN, SR MALEY, M ROLLETT, AD GARCIA, AR NOGAR, NS TI EPITAXIAL CEO2 FILMS AS BUFFER LAYERS FOR HIGH-TEMPERATURE SUPERCONDUCTING THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article AB We have prepared epitaxial (100)CeO2 thin films on LaAlO3, sapphire, and yttria-stabilized zirconia using pulsed laser deposition. It is demonstrated in this letter that the CeO2 films are chemically and structurally compatible to the high-temperature superconductor YBa2Cu3O7-delta (YBCO). Epitaxial YBCO films on CeO2/LaAlO3 had a zero resistance temperature and critical current density in a zero field of 90 K and 5.9 X 10(6) A/cm2 at 75 K, respectively. Furthermore, epitaxial multilayers of CeO2/YBCO were prepared. This work demonstrated that CeO2 is an excellent buffer layer material for the high-temperature superconductors. RP WU, XD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 11 TC 179 Z9 184 U1 2 U2 16 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2165 EP 2167 DI 10.1063/1.104994 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700038 ER PT J AU BUDAI, JD CHISHOLM, MF FEENSTRA, R LOWNDES, DH NORTON, DP BOATNER, LA CHRISTEN, DK AF BUDAI, JD CHISHOLM, MF FEENSTRA, R LOWNDES, DH NORTON, DP BOATNER, LA CHRISTEN, DK TI PREFERRED ALIGNMENT OF TWIN BOUNDARIES IN YBA2CU3OX THIN-FILMS AND YBA2CU3OX/PRBA2CU3OX SUPERLATTICES ON SRTIO3 SO APPLIED PHYSICS LETTERS LA English DT Article ID CRYSTALS AB The structure of c perpendicular to YBa2Cu3Ox thin films and YBa2Cu3Ox/PrBa2Cu3Ox superlattice films grown on (00L) SrTiO3 substrates has been studied using x-ray diffraction and transmission electron microscopy. The films consist of four symmetry-equivalent domains related by mutually perpendicular (hh0) and (hh0BAR) twin boundaries. One twin orientation is often highly favored over the other. We have correlated this in-plane symmetry breaking with small miscuts of the substrate surface towards the [HH0] direction and propose that interfacial steps act as nucleation sites for twins. Thus, by controlling the surface normal, a technique is described for producing films containing aligned twin boundaries. RP BUDAI, JD (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Boatner, Lynn/I-6428-2013; Budai, John/R-9276-2016 OI Boatner, Lynn/0000-0002-0235-7594; Budai, John/0000-0002-7444-1306 NR 9 TC 35 Z9 35 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 13 PY 1991 VL 58 IS 19 BP 2174 EP 2176 DI 10.1063/1.104997 PG 3 WC Physics, Applied SC Physics GA FL317 UT WOS:A1991FL31700041 ER PT J AU GREEN, PF RUSSELL, TP AF GREEN, PF RUSSELL, TP TI SEGREGATION OF LOW-MOLECULAR-WEIGHT SYMMETRICAL DIBLOCK COPOLYMERS AT THE INTERFACE OF HIGH-MOLECULAR-WEIGHT HOMOPOLYMERS SO MACROMOLECULES LA English DT Article ID BLOCK COPOLYMERS; IMMISCIBLE POLYMERS; METHACRYLATE); DIFFUSION; BLENDS AB Elastic recoil detection was used to study the segregation of low molecular weight symmetric diblock copolymers of polystyrene (PS) and poly(methyl methacrylate) (PMMA) to the interface of PS and PMMA homopolymers. Copolymer chains composed of 292 and of 262 segments were used. The PS and PMMA homopolymers were composed of 18 000 and 13 000 segments, respectively. At the concentrations studied, SIGMA-i-1, the excess number of copolymer chains per unit area at the interface of the homopolymers, varied linearly with, phi-c, the volume fraction of copolymer chains in the bulk. The solubility of the copolymer chains was found to be slightly higher in the PMMA phase than in the PS phase. The results are compared with predictions based on modification of mean field arguments of Leibler. The predicted dependence for the situation in which the density of copolymer chains at the interface is low is in good agreement with the experimental data. The predictions are based on assumptions that both the excluded volume interactions that lead to swelling of the copolymers at the interface and the elastic entropy contributions that limit the swelling of the copolymers are not important. An estimate of the Flory interaction parameter that was made based on the data and the theory is in good agreement with the value determined from small-angle neutron scattering of the PS/PMMA system. Finally, we estimated the reduction in interfacial tension that results when the copolymer chains segregate to the interface. It is consistent with surface tension data on similar systems. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP GREEN, PF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87195, USA. NR 19 TC 49 Z9 50 U1 2 U2 21 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 13 PY 1991 VL 24 IS 10 BP 2931 EP 2935 DI 10.1021/ma00010a045 PG 5 WC Polymer Science SC Polymer Science GA FL697 UT WOS:A1991FL69700045 ER PT J AU FRIEMAN, JA GIUDICE, GF AF FRIEMAN, JA GIUDICE, GF TI COSMIC TECHNICOLOR NUGGETS SO NUCLEAR PHYSICS B LA English DT Article ID MIT BAG MODEL; SPONTANEOUS SYMMETRY-BREAKING; WEINBERG-SALAM THEORY; OF-MASS CORRECTION; STRANGE MATTER; CHIRAL HIERARCHIES; EARLY UNIVERSE; MISSING MASS; PHASES; EVAPORATION AB We study the structure of technicolor theories at finite baryon number. In particular, we investigate whether "technicolor matter", containing comparable numbers of all technifermions, may be absolutely stable, as opposed to individual technibaryons. This proposal is the technicolor analogue of Witten's conjecture regarding the stability of strange (three-flavor quark) matter. We model technicolor using a rescaled version of the MIT bag. For gauge group SU(N)TC, the stability and cosmic durability of techni-matter is enhanced with increasing N and for large flavor symmetry. For N greater-than-or-similar-to 5-8, technimatter nuggets formed at the technicolor confinement transition can survive to the present epoch, and they are likely to contain virtually all of the technibaryon number of the Universe. We discuss various astrophysical and experimental constraints on the abundance of technicolor nuggets in the galactic halo. RP FRIEMAN, JA (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 62 TC 5 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAY 13 PY 1991 VL 355 IS 1 BP 162 EP 191 DI 10.1016/0550-3213(91)90308-K PG 30 WC Physics, Particles & Fields SC Physics GA FH741 UT WOS:A1991FH74100009 ER PT J AU MARCIANO, WJ PAIGE, FE AF MARCIANO, WJ PAIGE, FE TI ASSOCIATED PRODUCTION OF HIGGS BOSONS WITH TBART PAIRS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-QUARK FUSION; MASS; MODEL; BOUNDS; DECAYS AB Associated production of Higgs bosons with top-antitop pairs at hadron colliders, pp --> HttBARX, is examined. By tagging on an isolated secondary lepton, e or mu, from the t or tBAR decay, discovery of an intermediate-mass Higgs boson, m(H) congruent-to 80-150 GeV, via H --> gamma-gamma is rendered feasible at the Superconducting Super Collider (SSC) (square-root s = 40 TeV). Allowing a factor-of-0.4 signal reduction for isolation cuts and selection efficiencies leaves about 21 events per SSC year for m(H) congruent-to 80-130 GeV, and somewhat less for 130-150 GeV, above an anticipated small background. At the CERN Large Hadron Collider (square-root s = 16 TeV), the cross section is reduced by about a factor of 1/8. C1 SUPERCONDUCTING SUPER COLLIDER SSC,DIV PHYS RES,DALLAS,TX 75237. RP MARCIANO, WJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 21 TC 110 Z9 111 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 13 PY 1991 VL 66 IS 19 BP 2433 EP 2435 DI 10.1103/PhysRevLett.66.2433 PG 3 WC Physics, Multidisciplinary SC Physics GA FL122 UT WOS:A1991FL12200005 ER PT J AU SUR, B NORMAN, EB LESKO, KT HINDI, MM LARIMER, RM LUKE, PN HANSEN, WL HALLER, EE AF SUR, B NORMAN, EB LESKO, KT HINDI, MM LARIMER, RM LUKE, PN HANSEN, WL HALLER, EE TI EVIDENCE FOR THE EMISSION OF A 17-KEV NEUTRINO IN THE BETA-DECAY OF C-14 SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-NEUTRINO; SPECTRUM; SEARCH; S-35; MASSES; LIMITS AB We have studied the beta-spectrum of C-14 using a germanium detector containing a crystal with C-14 disolved in it. We find a feature in the beta-spectrum 17 keV below the end point which can be explained by the hypothesis that there is a heavy neutrino emitted in the beta-decay of C-14 with a mass of 17 +/- 2 keV and an emission probability of (1.40 +/- 0.45 +/- 0.14)%. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. TENNESSEE TECHNOL UNIV,DEPT PHYS,COOKEVILLE,TN 38505. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. NR 28 TC 138 Z9 138 U1 1 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 MAY 13 PY 1991 VL 66 IS 19 BP 2444 EP 2447 DI 10.1103/PhysRevLett.66.2444 PG 4 WC Physics, Multidisciplinary SC Physics GA FL122 UT WOS:A1991FL12200008 ER PT J AU CARRA, P HARMON, BN THOLE, BT ALTARELLI, M SAWATZKY, GA AF CARRA, P HARMON, BN THOLE, BT ALTARELLI, M SAWATZKY, GA TI MAGNETIC-X-RAY DICHROISM IN GADOLINIUM METAL SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXCHANGE SCATTERING; ABSORPTION-SPECTRA; FERROMAGNETIC GD; SYSTEMS AB We present a calculation of magnetic x-ray dichroism at the L2,3 edges of Gd metal, which takes into account dipolar transitions to the spin-polarized conduction bands, as well as quadrupole transitions to the highly localized 4f states. The striking agreement with the data demonstrates the validity of the single-particle approximation in the whole range of energies, above the Fermi level, probed by the experiments. The quadrupolar dischroism is important in determining the pre-edge structure of the measured spectra. Results for the L2,3 edges of Ho are also briefly discussed. C1 STATE UNIV GRONINGEN,DEPT CHEM PHYS,9747 AG GRONINGEN,NETHERLANDS. STATE UNIV GRONINGEN,CTR MAT SCI,DEPT APPL & SOLID STATE PHYS,9747 AG GRONINGEN,NETHERLANDS. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. MAX PLANCK INST FESTKORPERFORSCH,HOCHFELD MAGNET LAB,F-91405 ORSAY,FRANCE. RP CARRA, P (reprint author), EUROPEAN SYNCHROTRON RADIAT FACIL,BP 220,F-38043 GRENOBLE,FRANCE. RI Sawatzky, George/D-2997-2012 NR 20 TC 112 Z9 112 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 13 PY 1991 VL 66 IS 19 BP 2495 EP 2498 DI 10.1103/PhysRevLett.66.2495 PG 4 WC Physics, Multidisciplinary SC Physics GA FL122 UT WOS:A1991FL12200021 ER PT J AU SHORE, HB ROSE, JH AF SHORE, HB ROSE, JH TI THEORY OF IDEAL METALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACES; DENSITY AB An improved electron-gas model is proposed; it predicts the trends in the chemical potentials, cohesive energies, surface energies, and work functions of the simple metals. The uniform electron gas is altered so that it is in mechanical equilibrium at the electron density characteristic of a given metal. This leads to a new rule for splitting the constant background charge when jellium is cleaved. The trends in the energetics of metals result. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. RP SAN DIEGO STATE UNIV, DEPT PHYS, SAN DIEGO, CA 92182 USA. NR 9 TC 74 Z9 74 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 13 PY 1991 VL 66 IS 19 BP 2519 EP 2522 DI 10.1103/PhysRevLett.66.2519 PG 4 WC Physics, Multidisciplinary SC Physics GA FL122 UT WOS:A1991FL12200027 ER PT J AU ZHOU, Y BOWEN, SP MANCINI, JD AF ZHOU, Y BOWEN, SP MANCINI, JD TI MANY-ELECTRON VARIATIONAL GROUND-STATE OF THE 2-DIMENSIONAL ANDERSON LATTICE SO PHYSICS LETTERS A LA English DT Article ID BODY PROBLEM; MODEL; TRIDIAGONALIZATION AB A variational upper bound of the ground state energy of function of lattice size (up to 16 x 16). Two different sets of many-electron basis vectors are used to determine the ground state for all values of the Coulomb integral U. This variational scheme has been successfully tested for one-dimensional models and should give good estimates in two dimensions. C1 FORDHAM UNIV,DEPT PHYS,BRONX,NY 10458. RP ZHOU, Y (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 13 PY 1991 VL 155 IS 4-5 BP 290 EP 292 DI 10.1016/0375-9601(91)90485-Q PG 3 WC Physics, Multidisciplinary SC Physics GA FP361 UT WOS:A1991FP36100014 ER PT J AU JOHNSON, KH GRAY, DM SUTHERLAND, JC AF JOHNSON, KH GRAY, DM SUTHERLAND, JC TI VACUUM UV CD SPECTRA OF HOMOPOLYMER DUPLEXES AND TRIPLEXES CONTAINING A.T OR A.U BASE-PAIRS SO NUCLEIC ACIDS RESEARCH LA English DT Article ID HELIX FORMATION; CIRCULAR-DICHROISM; STRANDED POLYNUCLEOTIDES; DNA; CONFORMATION; SEQUENCE; CLEAVAGE; SITE; POLY(DA).POLY(DT); BINDING AB Vacuum UV circular dichroism (CD) spectra were measured down to 174 nm for five homopolymers, five duplexes, and four triplexes containing adenine, uracil, and thymine. Near 190 nm, the CD bands of poly[d(A)] and poly[r(A)] were larger than the CD bands of the polypyrimidines, poly[d(T)], poly[d(U)], and poly[r(U)]. Little change was observed in the 190 nm region upon formation of the duplexes (poly[d(A).d(T)], poly[d(A).d(U)], poly[r(A).d(T)], poly[r(A).d(U)], and poly[r(A).r(U)]) or upon formation of two of the triplexes (poly[d(T).d(A).d(T)] and poly[d(U).d(A).d(U)]). This showed that the purine strand had the same or a similar structure in these duplexes and triplexe as when free in solution. Both A.U and A.T base pairing induced positive bands at 177 and 202 nm. For three triplexes containing poly[d(A)], the formation of a triplex from a duplex and a free pyrimidine strand induced a negative band centered between 210 and 215 nm. The induction of a band between 210 and 215 nm indicated that these triplexes had aspects of the A conformation. C1 UNIV TEXAS,PROGRAM MOLEC & CELL BIOL,MAIL STOP FO31,BOX 830688,RICHARDSON,TX 75083. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM-19060, GM-35662] NR 27 TC 49 Z9 50 U1 0 U2 5 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 11 PY 1991 VL 19 IS 9 BP 2275 EP 2280 DI 10.1093/nar/19.9.2275 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FM145 UT WOS:A1991FM14500004 PM 2041768 ER PT J AU YANG, WK HENLEY, DC AF YANG, WK HENLEY, DC TI A SIMPLE AND ECONOMICAL PROCEDURE FOR LARGE-SCALE PLASMID DNA ISOLATION SO NUCLEIC ACIDS RESEARCH LA English DT Note RP YANG, WK (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [Y01 ES 40118] NR 3 TC 2 Z9 2 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 11 PY 1991 VL 19 IS 9 BP 2507 EP 2507 DI 10.1093/nar/19.9.2507 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FM145 UT WOS:A1991FM14500049 PM 2041793 ER PT J AU STRICKLAND, RN CHANDLER, DW AF STRICKLAND, RN CHANDLER, DW TI RECONSTRUCTION OF AN AXISYMMETRICAL IMAGE FROM ITS BLURRED AND NOISY PROJECTION SO APPLIED OPTICS LA English DT Article ID MULTIPHOTON IONIZATION; NM PHOTODISSOCIATION; METHYL-IODIDE; RESTORATION; TRANSFORM; STATE AB The 3-D velocity distribution of ionized photofragments resulting from the dissociation of methyl iodide is recovered by digitally deblurring and Abel inverting a single measured 2-D projection. The reconstructed distribution reveals two rings which are the dissociation channels corresponding to ground state and excited state iodine. A factor of 1.6 in resolution improvement of the channels is achieved by deconvolving the 2-D projection using a line-by-line implementation of Kawata's reblur algorithm. This technique guarantees noise-smoothed projections for the notoriously sensitive Abel inversion procedure, which in this paper is implemented using discrete Fourier and Hankel transforms. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. RP STRICKLAND, RN (reprint author), UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721, USA. NR 20 TC 36 Z9 36 U1 0 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 10 PY 1991 VL 30 IS 14 BP 1811 EP 1819 PG 9 WC Optics SC Optics GA FM764 UT WOS:A1991FM76400008 PM 20700363 ER PT J AU MAUCHE, CW WADE, RA POLIDAN, RS VANDERWOERD, H PAERELS, FBS AF MAUCHE, CW WADE, RA POLIDAN, RS VANDERWOERD, H PAERELS, FBS TI ON THE X-RAY EMITTING BOUNDARY-LAYER OF THE DWARF NOVA VW-HYDRI SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, DWARF NOVAE; STARS, INDIVIDUAL (VW-HYI); STARS, X-RAYS ID CATACLYSMIC VARIABLES; IUE OBSERVATIONS; ACCRETION DISKS; SS-CYGNI; EMISSION; OSCILLATIONS AB By combining EXOSAT LE filter observations of the dwarf nova VW Hyi in superoutburst with Voyager far-and extreme-ultraviolet spectrophotometry and a measurement of the column density of neutral hydrogen, we have constrained the temperature and luminosity of the boundary layer of VW Hyi to be kT(BL) approximately 10.5 eV and L(BL) approximately 6 x 10(32) (d/65 pc)2 ergs s-1. Based on contemporaneous optical, IUE, and Voyager spectrophotometry, Polidan, Mauche, & Wade found that the luminosity of the accretion disk is L(disk) approximately 1.5 x 10(34) (d/65 pc)2 ergs s-1. Therefore, while theory predicts that the luminosities of the boundary layer and the accretion disk should be comparable unless the white dwarf is rotating very rapidly, zeta = L(BL)L(disk) approximately 1, we find that zeta approximately 0.04. We also find that EXOSAT Al-Par filter observations of VW Hyi in outburst are likely to be severely contaminated by light from the accretion disk. The contamination of the Al-Par filter and the consequent high Al-Par over 3000 Lex filter ratio is therefore not the signature of a luminous ultrasoft boundary layer but rather that of the inner accretion disk, a component which is suppressed in observations of other cataclysmic variables because of their higher neutral hydrogen column densities. C1 UNIV CALIF BERKELEY,DEPT PHYS,SPACE SCI LAB,BERKELEY,CA 94720. UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85724. RIJKSINST VOLKSGEZONDHEID MILIEUHYG,EXOSAT OBSERV,3720 BA BILTHOVEN,NETHERLANDS. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RIJKSINST VOLKSGEZONDHEID MILIEUHYG,AIR RES LAB,3720 BA BILTHOVEN,NETHERLANDS. RP MAUCHE, CW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,L-401,POB 808,LIVERMORE,CA 94550, USA. RI van der Woerd, Hans/K-9812-2013 OI van der Woerd, Hans/0000-0002-8901-7567 NR 21 TC 27 Z9 27 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 10 PY 1991 VL 372 IS 2 BP 659 EP 663 DI 10.1086/170008 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FK241 UT WOS:A1991FK24100026 ER PT J AU GRIEST, K ALCOCK, C AXELROD, TS BENNETT, DP COOK, KH FREEMAN, KC PARK, HS PERLMUTTER, S PETERSON, BA QUINN, PJ RODGERS, AW STUBBS, CW AF GRIEST, K ALCOCK, C AXELROD, TS BENNETT, DP COOK, KH FREEMAN, KC PARK, HS PERLMUTTER, S PETERSON, BA QUINN, PJ RODGERS, AW STUBBS, CW TI GRAVITATIONAL MICROLENSING AS A METHOD OF DETECTING DISK DARK MATTER AND FAINT DISK STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DARK MATTER; GRAVITATIONAL LENSES; STARS, LOW-MASS ID GALACTIC DISK; DENSITY; LENS; SUN AB Gravitational microlensing of stars in the Galactic bulge is proposed as a method of probing the mass density of disk objects in the 10(-3) to 10(-1) M. range. A substantial rate is found if disk dark matter of this form exists, and even without any dark matter, a significant microlensing rate is found, owing to the faint low-mass disk stars which are known to exist. Such a search would provide new information on the disk dark matter question, probe the low-end stellar mass function, and also search for halo dark matter, all with rates comparable to those expected for the ongoing LMC microlensing halo dark matter searches. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WODEN,ACT 2606,AUSTRALIA. RP GRIEST, K (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. RI Stubbs, Christopher/C-2829-2012; Quinn, Peter/B-3638-2013; Bennett, David/O-2136-2013; Perlmutter, Saul/I-3505-2015 OI Stubbs, Christopher/0000-0003-0347-1724; Bennett, David/0000-0001-8043-8413; Perlmutter, Saul/0000-0002-4436-4661 NR 17 TC 113 Z9 113 U1 0 U2 5 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 10 PY 1991 VL 372 IS 2 BP L79 EP L82 DI 10.1086/186028 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FK238 UT WOS:A1991FK23800008 ER PT J AU KLUZNIAK, W WILSON, JR AF KLUZNIAK, W WILSON, JR TI HARD X-RAY-SPECTRA FROM GAP ACCRETION ONTO NEUTRON-STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION; RELATIVITY; STARS, NEUTRON; X-RAYS, SPECTRA ID BINARIES; MODELS; DISKS; RADIATION AB Weakly magnetized neutron stars undergoing disk accretion are found to emit copious hard X-rays if the marginally stable orbit lies outside the stellar surface. In this general relativistic picture (impossible in Newtonian gravity) the accretion disk terminates well outside the stellar surface. Accreting matter crosses the "gap" between the disk and the star in free fall; it then strikes the neutron star surface at a shallow angle, creating a hot equatorial accretion belt with a temperature inversion. For accretion rates that are not too high, the fluid flowing through the gap is optically thin to X-rays escaping from the equatorial belt. The structure of the surface boundary layer in such stars may then be largely decoupled from that of the disk. We exhibit a typical emergent spectrum, which was obtained in a self-consistent manner by a one-plus-one-dimensional radiative transfer and hydro code; power-law emission extends up to approximately 200 keV. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KLUZNIAK, W (reprint author), COLUMBIA UNIV,DEPT PHYS,ASTROPHYS LAB,NEW YORK,NY 10027, USA. NR 27 TC 49 Z9 49 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 10 PY 1991 VL 372 IS 2 BP L87 EP L90 DI 10.1086/186030 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FK238 UT WOS:A1991FK23800010 ER PT J AU WHITE, AR AF WHITE, AR TI ANALYTIC MULTI-REGGE THEORY AND THE POMERON IN QCD .1. THE SUPERCRITICAL POMERON SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article AB The formalism of analytic multi-Regge theory is developed as a basis for the study of abstract critical and super-critical pomeron high-energy behavior and for related studies of the Regge behavior of spontaneously broken gauge theories and the pomeron in QCD. Asymptotic domains of analyticity for multiparticle amplitudes are shown to follow from properties of field theory and S-matrix theory. General asymptotic dispersion relations are then derived for such amplitudes in which the spectral components are described by the graphical formalism of hexagraphs. Further consequences are distinct Sommerfeld-Watson representations for each hexagraph spectral component, together with a complete set of angular momentum plane unitarity equations which control the form of all multi-Regge amplitudes. Because of this constraint of "reggeon unitarity" the critical pomeron solution of the reggeon field theory gives the only known "non-trivial" unitary high-energy S-matrix. By exploiting the full structure of multi-Regge amplitudes as the pomeron becomes super-critical, one can study the simultaneous modification of hadrons and the pomeron. The result is a completely consistent description of the super-critical pomeron appearing in hadron scattering. Reggeon unitarity is satisfied in the super-critical phase by the appearance of a massive "gluon" (Reggeized vector particle) coupling pair-wise to the pomeron. RP WHITE, AR (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 0 TC 18 Z9 18 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD MAY 10 PY 1991 VL 6 IS 11 BP 1859 EP 1959 DI 10.1142/S0217751X91000976 PG 101 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA FH168 UT WOS:A1991FH16800001 ER PT J AU GABLE, CW OCONNELL, RJ TRAVIS, BJ AF GABLE, CW OCONNELL, RJ TRAVIS, BJ TI CONVECTION IN 3 DIMENSIONS WITH SURFACE PLATES - GENERATION OF TOROIDAL FLOW SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS LA English DT Article ID MANTLE CONVECTION; EARTHS MANTLE; SUBDUCTED SLABS; BENIOFF ZONES; MODELS; TECTONICS; NEODYMIUM; RHEOLOGY; BOUNDARY; MOTIONS AB This work presents numerical calculations of mantle convection that incorporate some of the basic observational constraints imposed by plate tectonics. The model is three-dimensional and includes surface plates; it allows plate velocity to change dynamically according to the forces which result from convection. We show that plates are an effective means of introducing a toroidal component into the flow field. After initial transients the plate motion is nearly parallel to transform faults and in the direction that tends to minimizes the toroidal flow field. The toroidal field decays with depth form its value at the surface; the poloidal field is relatively constant throughout the layer but falls off slightly at the top and bottom boundaries. Layered viscosity increasing with depth causes the toroidal field to decay more rapidly, effectively confining it to the upper, low-viscosity layer. The effect of viscosity layering on the poloidal field is relatively small, which we attribute to its generation by temperature variations distributed throughout the system. The generation of toroidal flow by surface plates would seem to account for the observed nearly equal energy of toroidal and poloidal fields of plate motions on the Earth. A low-viscosity region in the upper mantle will cause the toroidal flow to decay significantly before reaching the lower mantle. The resulting concentration of toroidal flow in the upper mantle may result in more thorough mixing there and account for some of the geochemical and isotopic differences proposed to exist between the upper and lower mantles. C1 UNIV CALIF LOS ALAMOS SCI LAB,INST GEOPHYS & PLANETARY PHYS,CTR NON LINEAR STUDIES,LOS ALAMOS,NM 87545. RP GABLE, CW (reprint author), HARVARD UNIV,DEPT EARTH & PLANETARY SCI,20 OXFORD ST,CAMBRIDGE,MA 02138, USA. RI Gable, Carl/B-4689-2011; OI Gable, Carl/0000-0001-7063-0815 NR 52 TC 127 Z9 128 U1 0 U2 7 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOLID PD MAY 10 PY 1991 VL 96 IS B5 BP 8391 EP 8405 DI 10.1029/90JB02743 PG 15 WC Geosciences, Multidisciplinary SC Geology GA FL388 UT WOS:A1991FL38800027 ER PT J AU AXE, JD AF AXE, JD TI NEUTRON-SCATTERING - PROGRESS AND PROSPECTS SO SCIENCE LA English DT Article ID VITREOUS SILICA; MAGNETIC-STRUCTURE; CRITICAL-BEHAVIOR; CRYSTAL; DIFFRACTION; REFLECTION; SUPERCONDUCTIVITY; LA2-XBAXCUO4; LA2-XSRXCUO4; DEPENDENCE AB Over the last decade the unique properties of neutrons have proven useful in a growing number of scientific disciplines. Neutron scattering, traditionally the probe of choice for many magnetic and spectroscopic studies, is now firmly established as an invaluable complement to x-ray scattering for structural and dynamic studies within many other areas of the material sciences, chemistry, and biology. In recent years the instruments and techniques have matured to the point where they are of increasing relevance to the understanding and design of improved practical, everyday materials. RP AXE, JD (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 71 TC 3 Z9 3 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 10 PY 1991 VL 252 IS 5007 BP 795 EP 802 DI 10.1126/science.2028255 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FL123 UT WOS:A1991FL12300036 PM 2028255 ER PT J AU Abreu, P Adam, W Adami, F Adye, T Akesson, T Alekseev, GD Allen, P Almehed, S Alted, F Alvsvaag, SJ Amaldi, U Anassontzis, E Antilougus, P Apel, WD Asman, B Astier, P Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Bardin, DY Baroncelli, A Barring, O Bartl, W Bates, MJ Baubillier, M Becks, KH Beeston, CJ Begalli, M Beilliere, P Belokopytov, I Belous, K Beltran, P Benedic, D Benlloch, JM Berggren, M Bertrand, D Biagi, S Bianchi, F Bibby, JH Bilenky, MS Billoir, P Bjarne, J Bloch, D Bogolubov, PN Bolognese, T Bonapart, M Bonesini, M Booth, PSL Boratav, M Borgeaud, P Borner, H Bosio, C Botner, O Bonquet, B Bozzo, M Braibant, S Branchini, P Brand, KD Brenner, RA Bricman, C Brown, RCA Brummer, N Brunet, JM Bugge, L Buran, T Burmeister, H Buytaert, JAMA Caccia, M Calvi, M Rozas, AJC Campagne, JE Campion, A Camporesi, T Canale, V Cao, F Carroll, L Caso, C Castelli, E Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Charpentier, P Checchia, P Chelkov, GA Chevalier, L Chliapnikov, P Chorowicz, V Cirio, R Clara, MP Contreras, JL Contri, R Cosme, G Couchot, F Crawley, HB Crennell, D Crosetti, G Crosland, N Crozon, M Maestro, JC Czellar, S Dagoret, S Dahl-Jensen, E Dalmagne, B Dam, M Damgaard, G Darbo, G Daubie, E Dauncey, PD Davenport, M David, P De Angelis, A De Beer, M De Boeck, H De Boer, W De Clercq, C Laso, MDMD De Groot, N De La Vaissiere, C De Lotto, B Defoix, C Delikaris, D Delorme, S Delpierre, P Demaria, N Di Ciaccio, L Dijkstra, H Djama, F Dolbeau, J Doll, O Donszelmann, M Doroba, K Dracos, M Drees, J Dris, M Dulinski, W Dzhelyadin, R Eek, LO Eerola, PAM Ekelof, T Ekspong, G Engel, JP Falaleev, V Fassouliotis, D Fenyuk, A Alonso, MF Ferrer, A Filippas, TA Firestone, A Foeth, H Fokitis, E Folegati, P Fontanelli, F Forsbach, H Franek, B Fransson, KE Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R Fulda-Quenzer, F Furnival, K Furstenau, H Fuster, J Gago, JM Galeazzi, G Gamba, D Garcia, J Gasparini, U Gavillet, P Gazis, EN Gerber, JP Giacomelli, P Glitza, KW Gokieli, R Golovatyuk, VM Cadenas, JJGY Goobar, A Gopal, G Gorski, M Gracco, V Grant, A Grard, F Graziani, E Gritsaenko, IA Gros, MH Grosdidier, G Grossetete, B Gumenyuk, S Guy, J Hahn, F Hahn, M Haider, S Hajduk, Z Hakansson, A Hallgren, A Hamacher, K De Monchenault, GH Harris, FJ Heck, BW Herbst, I Hernandez, JJ Herquet, P Herr, H Higon, E Hilke, HJ Hodgson, SD Hofmokl, T Holmes, R Holmgren, SO Holthuizen, D Hooper, JE Houlden, M Hrubec, J Hulth, PO Hultqvist, K Husson, D Hyams, BD Ioannou, P Iversen, PS Jackson, JN Jalocha, P Jarlskog, G Jarry, P Jean-Marie, B Johansson, EK Johnson, D Jonker, M Jonsson, L Juillot, P Kalkanis, G Kalmus, G Kantardjian, G Kapusta, F Kapusta, P Katsanevas, S Katsoufis, EC Keranen, R Kesteman, J Khomenko, BA Khovanski, NN King, B Klein, H Klempt, W Klovning, A Kluit, P Koehne, JH Koene, B Kokkinias, P Kopf, M Koratzinos, M Korcyl, K Korytov, AV Korzen, B Kostrikov, M Kostukhin, V Kourkoumelis, C Kreuzberger, T Krolikowski, J Kruener-Marquis, U Krupinski, W Kucewicz, W Kurvinen, K Laakso, MI Lambropoulos, C Lamsa, JW Lanceri, L Lapchine, V Lapin, V Laugier, JP Lauhakangas, R Laurikainen, P Leder, G Ledroit, F Lemonne, J Lenzen, G Lepeltier, V Letessier-Selvon, A Lieb, E Lillethun, E Lindgren, J Lippi, I Llosa, R Loerstad, B Lokajicek, M Loken, JG Aguera, MAL Lopez-Fernandez, A Los, M Loukas, D Lounis, A Lozano, JJ Lucock, R Lutz, P Lyons, L Maehlum, G Magnussen, N Maillard, J Maltezos, A Maltezos, S Mandl, F Marco, J Margoni, M Marin, JC Markou, A Mathis, L Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R Mc Nulty, R Menichetti, E Meroni, C Meyer, WT Mitaroff, WA Mitselmakher, GC Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Muller, H Myatt, G Naraghi, F Nau-Korzen, U Navarria, FL Negri, P Nielsen, BS Nijjhar, B Nikolaenko, V Obraztsov, V Olshevski, AG Orava, R Ouraou, A Pain, R Palka, H Papadopoulou, T Pape, T Passeri, A Pegoraro, M Perevozchikov, V Pernicka, M Perrotta, A Pimenta, M Pingot, O Pinsent, A Pol, ME Polok, G Poropat, P Privitera, P Pullia, A Pyyhtia, J Rademakers, AA Radojicic, D Ragazzi, S Range, WH Ratoff, PN Read, AL Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, M Ridky, J Rinaudo, G Roditi, I Romero, A Ronchese, P Ronjin, V Rosenberg, EI Rossi, U Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W Ruhlmann, V Ruiz, A Saarikko, H Sacquin, Y Salt, J Sanchez, E Sanchez, J Sannino, M Schaeffer, M Schneider, H Scuri, F Segar, AM Sekulin, R Sessa, M Sette, G Seufert, R Shellard, RC Siegrist, P Simonetti, S Simonetto, F Sissakian, AN Skaali, TB Skjevling, G Smadja, G Smith, GR Sosnowski, R Spassoff, TS Spiriti, E Squarcia, S Staeck, H Stanescu, C Stavropoulos, G Stichelbaut, F Stocchi, A Strauss, J Strub, R Stubenrauch, CJ Szczekowski, M Szeptycka, M Szymanski, P Tavernier, S Tcherniaev, E Theodosiou, G Tilquin, A Timmermans, J Timofeev, VG Tkatchev, LG Todorov, T Toet, DZ Topphol, AK Tortora, L Trainor, MT Treille, D Trevisan, U Trischuk, W Tristram, G Troncon, C Tsirou, A Tsyganov, EN Turala, M Turchetta, R Turluer, ML Tuuva, T Tyapkin, IA Tyndel, M Tzamarias, S Udo, F Ueberschaer, S Uvarov, VA Valenti, G Vallazza, E Ferrer, JAV Van Apeldoorn, GW Van Dam, P Van Doninck, WK Van Eijndhoven, N Vander Velde, C Varela, J Vaz, P Vegni, G Velasco, J Ventura, L Venus, W Verbeure, F Vertogradov, LS Vibert, L Vilanova, D Vishnevsky, N Vlasov, EV Vodopyanov, AS Vollmer, M Voulgaris, G Voutilainen, M Vrba, V Wahlen, H Walck, C Waldner, F Wayne, M Wehr, A Weilhammer, P Werner, J Wetherell, AM Wickens, JH Wikne, J Wilkinson, GR Williams, WSC Winter, M Wormald, D Wormser, G Woschnagg, K Yamdagni, N Yepes, P Zaitsev, A Zalewska, A Zalewski, P Zevgolatakos, E Zhang, G Zimin, NI Zitoun, R Funchal, RZ Zumerle, G Zuniga, J AF Abreu, P Adam, W Adami, F Adye, T Akesson, T Alekseev, GD Allen, P Almehed, S Alted, F Alvsvaag, SJ Amaldi, U Anassontzis, E Antilougus, P Apel, WD Asman, B Astier, P Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Bardin, DY Baroncelli, A Barring, O Bartl, W Bates, MJ Baubillier, M Becks, KH Beeston, CJ Begalli, M Beilliere, P Belokopytov, I Belous, K Beltran, P Benedic, D Benlloch, JM Berggren, M Bertrand, D Biagi, S Bianchi, F Bibby, JH Bilenky, MS Billoir, P Bjarne, J Bloch, D Bogolubov, PN Bolognese, T Bonapart, M Bonesini, M Booth, PSL Boratav, M Borgeaud, P Borner, H Bosio, C Botner, O Bonquet, B Bozzo, M Braibant, S Branchini, P Brand, KD Brenner, RA Bricman, C Brown, RCA Brummer, N Brunet, JM Bugge, L Buran, T Burmeister, H Buytaert, JAMA Caccia, M Calvi, M Rozas, AJC Campagne, JE Campion, A Camporesi, T Canale, V Cao, F Carroll, L Caso, C Castelli, E Gimenez, MVC Cattai, A Cavallo, FR Cerrito, L Charpentier, P Checchia, P Chelkov, GA Chevalier, L Chliapnikov, P Chorowicz, V Cirio, R Clara, MP Contreras, JL Contri, R Cosme, G Couchot, F Crawley, HB Crennell, D Crosetti, G Crosland, N Crozon, M Maestro, JC Czellar, S Dagoret, S Dahl-Jensen, E Dalmagne, B Dam, M Damgaard, G Darbo, G Daubie, E Dauncey, PD Davenport, M David, P De Angelis, A De Beer, M De Boeck, H De Boer, W De Clercq, C Laso, MDMD De Groot, N De La Vaissiere, C De Lotto, B Defoix, C Delikaris, D Delorme, S Delpierre, P Demaria, N Di Ciaccio, L Dijkstra, H Djama, F Dolbeau, J Doll, O Donszelmann, M Doroba, K Dracos, M Drees, J Dris, M Dulinski, W Dzhelyadin, R Eek, LO Eerola, PAM Ekelof, T Ekspong, G Engel, JP Falaleev, V Fassouliotis, D Fenyuk, A Alonso, MF Ferrer, A Filippas, TA Firestone, A Foeth, H Fokitis, E Folegati, P Fontanelli, F Forsbach, H Franek, B Fransson, KE Frenkiel, P Fries, DC Frodesen, AG Fruhwirth, R Fulda-Quenzer, F Furnival, K Furstenau, H Fuster, J Gago, JM Galeazzi, G Gamba, D Garcia, J Gasparini, U Gavillet, P Gazis, EN Gerber, JP Giacomelli, P Glitza, KW Gokieli, R Golovatyuk, VM Cadenas, JJGY Goobar, A Gopal, G Gorski, M Gracco, V Grant, A Grard, F Graziani, E Gritsaenko, IA Gros, MH Grosdidier, G Grossetete, B Gumenyuk, S Guy, J Hahn, F Hahn, M Haider, S Hajduk, Z Hakansson, A Hallgren, A Hamacher, K De Monchenault, GH Harris, FJ Heck, BW Herbst, I Hernandez, JJ Herquet, P Herr, H Higon, E Hilke, HJ Hodgson, SD Hofmokl, T Holmes, R Holmgren, SO Holthuizen, D Hooper, JE Houlden, M Hrubec, J Hulth, PO Hultqvist, K Husson, D Hyams, BD Ioannou, P Iversen, PS Jackson, JN Jalocha, P Jarlskog, G Jarry, P Jean-Marie, B Johansson, EK Johnson, D Jonker, M Jonsson, L Juillot, P Kalkanis, G Kalmus, G Kantardjian, G Kapusta, F Kapusta, P Katsanevas, S Katsoufis, EC Keranen, R Kesteman, J Khomenko, BA Khovanski, NN King, B Klein, H Klempt, W Klovning, A Kluit, P Koehne, JH Koene, B Kokkinias, P Kopf, M Koratzinos, M Korcyl, K Korytov, AV Korzen, B Kostrikov, M Kostukhin, V Kourkoumelis, C Kreuzberger, T Krolikowski, J Kruener-Marquis, U Krupinski, W Kucewicz, W Kurvinen, K Laakso, MI Lambropoulos, C Lamsa, JW Lanceri, L Lapchine, V Lapin, V Laugier, JP Lauhakangas, R Laurikainen, P Leder, G Ledroit, F Lemonne, J Lenzen, G Lepeltier, V Letessier-Selvon, A Lieb, E Lillethun, E Lindgren, J Lippi, I Llosa, R Loerstad, B Lokajicek, M Loken, JG Aguera, MAL Lopez-Fernandez, A Los, M Loukas, D Lounis, A Lozano, JJ Lucock, R Lutz, P Lyons, L Maehlum, G Magnussen, N Maillard, J Maltezos, A Maltezos, S Mandl, F Marco, J Margoni, M Marin, JC Markou, A Mathis, L Matorras, F Matteuzzi, C Matthiae, G Mazzucato, M McCubbin, M McKay, R Mc Nulty, R Menichetti, E Meroni, C Meyer, WT Mitaroff, WA Mitselmakher, GC Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Morettini, P Mueller, H Muller, H Myatt, G Naraghi, F Nau-Korzen, U Navarria, FL Negri, P Nielsen, BS Nijjhar, B Nikolaenko, V Obraztsov, V Olshevski, AG Orava, R Ouraou, A Pain, R Palka, H Papadopoulou, T Pape, T Passeri, A Pegoraro, M Perevozchikov, V Pernicka, M Perrotta, A Pimenta, M Pingot, O Pinsent, A Pol, ME Polok, G Poropat, P Privitera, P Pullia, A Pyyhtia, J Rademakers, AA Radojicic, D Ragazzi, S Range, WH Ratoff, PN Read, AL Redaelli, NG Regler, M Reid, D Renton, PB Resvanis, LK Richard, F Richardson, M Ridky, J Rinaudo, G Roditi, I Romero, A Ronchese, P Ronjin, V Rosenberg, EI Rossi, U Rosso, E Roudeau, P Rovelli, T Ruckstuhl, W Ruhlmann, V Ruiz, A Saarikko, H Sacquin, Y Salt, J Sanchez, E Sanchez, J Sannino, M Schaeffer, M Schneider, H Scuri, F Segar, AM Sekulin, R Sessa, M Sette, G Seufert, R Shellard, RC Siegrist, P Simonetti, S Simonetto, F Sissakian, AN Skaali, TB Skjevling, G Smadja, G Smith, GR Sosnowski, R Spassoff, TS Spiriti, E Squarcia, S Staeck, H Stanescu, C Stavropoulos, G Stichelbaut, F Stocchi, A Strauss, J Strub, R Stubenrauch, CJ Szczekowski, M Szeptycka, M Szymanski, P Tavernier, S Tcherniaev, E Theodosiou, G Tilquin, A Timmermans, J Timofeev, VG Tkatchev, LG Todorov, T Toet, DZ Topphol, AK Tortora, L Trainor, MT Treille, D Trevisan, U Trischuk, W Tristram, G Troncon, C Tsirou, A Tsyganov, EN Turala, M Turchetta, R Turluer, ML Tuuva, T Tyapkin, IA Tyndel, M Tzamarias, S Udo, F Ueberschaer, S Uvarov, VA Valenti, G Vallazza, E Ferrer, JAV Van Apeldoorn, GW Van Dam, P Van Doninck, WK Van Eijndhoven, N Vander Velde, C Varela, J Vaz, P Vegni, G Velasco, J Ventura, L Venus, W Verbeure, F Vertogradov, LS Vibert, L Vilanova, D Vishnevsky, N Vlasov, EV Vodopyanov, AS Vollmer, M Voulgaris, G Voutilainen, M Vrba, V Wahlen, H Walck, C Waldner, F Wayne, M Wehr, A Weilhammer, P Werner, J Wetherell, AM Wickens, JH Wikne, J Wilkinson, GR Williams, WSC Winter, M Wormald, D Wormser, G Woschnagg, K Yamdagni, N Yepes, P Zaitsev, A Zalewska, A Zalewski, P Zevgolatakos, E Zhang, G Zimin, NI Zitoun, R Funchal, RZ Zumerle, G Zuniga, J TI A STUDY OF THE REACTION E+E--]MU+MU- AROUND THE Z0 POLE SO PHYSICS LETTERS B LA English DT Article ID RESONANCE PARAMETERS; LEPTONIC DECAYS; PARTIAL WIDTHS; BOSON AB Measurements of the cross section and forward-backward asymmetry for the reaction e+e- --> mu+mu- using the DELPHI detector at LEP are presented. The data come from a scan around the Z0 peak at seven centre of mass energies, giving a sample of 3858 events in the polar angle region 22-degrees < theta < 158-degrees. From a fit to the cross section for 43-degrees < theta < 137-degrees, a polar angle region for which the absolute efficiency has been determined, the square root of the product of the Z0 --> e+e- and Z0 --> mu+mu- partial widths is determined to be (GAMMA-e-GAMMA-mu)1/2 = 85.0 +/- 0.9 (stat.) +/- 0.8 (syst.) MeV. From this measurement of the partial width, the value of the effective weak mixing angle is determined to be sin2(theta-w) = 0.2267 +/- 0.0037. The ratio of the hadronic to muon pair partial widths is found to be GAMMA-h/GAMMA-mu = 19.89 +/- 0.40 (stat.) +/- 0.19 (syst.). The forward-backward asymmetry at the resonance peak energy E(CMS) = 91.22 GeV is found to be A(FB) = 0.028 +/- 0.020 (stat.) +/- 0.005 (syst.). From a combined fit to the cross section and forward-backward asymmetry data, the products of the electron and muon vector and axial-vector coupling constants are determined to be V(e)V-mu = 0.0024 +/- 0.0015 (stat.) +/- 0.0004 (syst.) and A(e)A-mu = 0.253 +/- 0.003 (stat.) +/- 0.003 (syst.). These results are in good agreement with the expectations of the minimal standard model. C1 LIP, P-1000 Lisbon, PORTUGAL. Oesterreich Akad Wissensch, Inst Hochenergiephys, A-1050 Vienna, AUSTRIA. CEN Saclay, DPhPE, F-91191 Gif Sur Yvette, FRANCE. Rutherford Appleton Lab, Chilton OXll OQX, Didcot, ENGLAND. Univ Lund, Dept Phys, S-22363 Lund, SWEDEN. Joint Inst Nucl Res, SU-101000 Moscow, RUSSIA. Univ Valencia, Inst Fis Corpuscular IFIC, Ctr Mixto, CSIC, E-46100 Burjassot, Valencia, SPAIN. Univ Bergen, Dept Phys, N-5007 Bergen, NORWAY. CERN, CH-1211 Geneva 23, SWITZERLAND. Univ Athens, Phys Lab, GR-10680 Athens, GREECE. Univ Lyon 1, F-69622 Villeurbanne, FRANCE. Univ Karlsruhe, Inst Expt Kernphys, W-7500 Karlsruhe 1, GERMANY. Univ Stockholm, Inst Phys, S-11346 Stockholm, SWEDEN. Univ Paris 06, LPNHE, F-75230 Paris 05, FRANCE. Univ Paris 07, LPNHE, F-75230 Paris 05, FRANCE. Univ Paris Sud, Lab Accelerateur Lineaire, F-91405 Orsay, FRANCE. Univ Trieste, Dipartimento Fis, I-34127 Trieste, ITALY. Ist Nazl Fis Nucl, I-34127 Trieste, ITALY. Univ Udine, Ist Fis, I-33100 Udine, ITALY. Ist Nazl Fis Nucl, Ist Super Sanita, I-01161 Rome, ITALY. Univ Rome 2, Dipartimento Fis, I-00173 Rome, ITALY. Ist Nazl Fis Nucl, I-00173 Rome, ITALY. Univ Oxford, Nucl Phys Lab, Oxford OX1 3RH, ENGLAND. Univ Wuppertal, Fachbereich Phys, W-5600 Wuppertal 1, GERMANY. Univ Genoa, Dipartimento Fis, I-16146 Genoa, ITALY. Ist Nazl Fis Nucl, I-16146 Genoa, ITALY. Coll France, Lab Phys Corpusculaire, F-75231 Paris 05, FRANCE. Inst High Energy Phys, SU-142 284 Protvino, Moscow Region, RUSSIA. NRC Demokritos, Inst Nucl Phys, GR-15310 Athens, GREECE. CRN Grp DELPHI, Div Hautes Energies, F-67037 Strasbourg, FRANCE. LEPSI, F-67037 Strasbourg, FRANCE. Univ Instelling Antwerp, Dept Phys, B-2610 Wilrijk, BELGIUM. ULB VUB, IIHE, B-1050 Brussels, BELGIUM. Univ Etat Mons, Fac Sci, Serv Phys Part Elem, B-7000 Mons, BELGIUM. Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, ENGLAND. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, ITALY. Ist Nazl Fis Nucl, I-10125 Turin, ITALY. NIKHEF H, NL-1009 DB Amsterdam, NETHERLANDS. Univ Milan, Dipartmento Fis, I-20133 Milan, ITALY. Ist Nazl Fis Nucl, I-20133 Milan, ITALY. Univ Uppsala, Dept Radiat Sci, S-75121 Uppsala, SWEDEN. Univ Padua, Dipartimento Fis, I-35131 Padua, ITALY. Ist Nazl Fis Nucl, I-35131 Padua, ITALY. Univ Helsinki, Dept High Energy Phys, SF-00170 Helsinki 17, FINLAND. Univ Oslo, Dept Phys, N-1000 Oslo 3, NORWAY. Univ Santander, Fac Ciencias, E-39005 Santander, SPAIN. Univ Bologna, Dipartimento Fis, I-40126 Bologna, ITALY. Ist Nazl Fis Nucl, I-40126 Bologna, ITALY. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys, Ames, IA 50011 USA. Niels Bohr Inst, DK-2100 Copenhagen 0, DENMARK. Univ Warsaw, PL-00681 Warsaw, POLAND. Inst Nucl Studies, PL-00681 Warsaw, POLAND. Natl Tech Univ, Dept Phys, GR-15773 Athens, GREECE. Inst Nucl Phys, High Energy Phys Lab, PL-30055 Krakow 30, POLAND. Fac Sci Luminy, F-13288 Marseille 09, FRANCE. RP Abreu, P (reprint author), LIP, Av Elias Garcia 14-1e, P-1000 Lisbon, PORTUGAL. RI Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Zuniga, Juan/P-4385-2014; Ruiz, Alberto/E-4473-2011; Vaz, Pedro/K-2464-2013; Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Tcherniaev, Evgueni/G-3453-2016; Olshevskiy, Alexander/I-1580-2016; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Zaitsev, Alexandre/B-8989-2017; Varela, Joao/K-4829-2016; OI Pimenta, Mario/0000-0002-2590-0908; Matteuzzi, Clara/0000-0002-4047-4521; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; De Angelis, Alessandro/0000-0002-3288-2517; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Zuniga, Juan/0000-0002-1041-6451; Ruiz, Alberto/0000-0002-3639-0368; Vaz, Pedro/0000-0002-7186-2359; Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Tcherniaev, Evgueni/0000-0002-3685-0635; Olshevskiy, Alexander/0000-0002-8902-1793; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Zaitsev, Alexandre/0000-0002-4961-8368; Varela, Joao/0000-0003-2613-3146; De Lotto, Barbara/0000-0003-3624-4480 NR 26 TC 6 Z9 6 U1 0 U2 5 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. Lett. B PD MAY 9 PY 1991 VL 260 IS 1-2 BP 240 EP 248 DI 10.1016/0370-2693(91)90998-6 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN050 UT WOS:A1991FN05000040 ER PT J AU CHOI, MG ROBERTSON, MJ ANGELICI, RJ AF CHOI, MG ROBERTSON, MJ ANGELICI, RJ TI SULFUR VERSUS 2,3-ETA-2 COORDINATION OF BENZO[B]THIOPHENE (BT) IN CP'(CO)2RE(BT) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID HOMOGENEOUS CATALYTIC-HYDROGENATION; COO-MOO3-AL2O3 CATALYST; IRIDIUM COMPLEXES; THIOPHENE; HYDRODESULFURIZATION; BENZOTHIOPHENE; METAL; MODEL; RUTHENIUM; REDUCTION C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,GILMAN HALL,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 27 TC 44 Z9 44 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 8 PY 1991 VL 113 IS 10 BP 4005 EP 4006 DI 10.1021/ja00010a060 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA FL177 UT WOS:A1991FL17700060 ER PT J AU GERMANAS, J AUBERT, C VOLLHARDT, KPC AF GERMANAS, J AUBERT, C VOLLHARDT, KPC TI ONE-STEP CONSTRUCTION OF THE STEMODANE FRAMEWORK VIA THE COBALT-CATALYZED CYCLIZATION OF MONOCYCLIC ENYNES - A FORMAL TOTAL SYNTHESIS OF STEMODIN SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID STEREOSELECTIVE TOTAL SYNTHESIS; APHIDICOLIN; (+/-)-APHIDICOLIN; (+/-)-MARITIMOL; DITERPENES; EFFICIENT; ACID; (+/-)-2-DESOXYSTEMODINONE; (+/-)-STEMODINONE; CONVERSION C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 45 TC 73 Z9 73 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 8 PY 1991 VL 113 IS 10 BP 4006 EP 4008 DI 10.1021/ja00010a061 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA FL177 UT WOS:A1991FL17700061 ER PT J AU MACHEROUX, P MASSEY, V THIELE, DJ VOLOKITA, M AF MACHEROUX, P MASSEY, V THIELE, DJ VOLOKITA, M TI EXPRESSION OF SPINACH GLYCOLATE OXIDASE IN SACCHAROMYCES-CEREVISIAE - PURIFICATION AND CHARACTERIZATION SO BIOCHEMISTRY LA English DT Article ID FLAVOENZYME LACTATE OXIDASE; ACTIVE-SITE PROBES; ACID OXIDASE; GLYCOLLATE OXIDASE; PIG LIVER; FLAVOPROTEINS; MECHANISM; YEAST; ADDUCTS; 8-MERCAPTOFLAVINS AB Glycolate oxidase from spinach has been expressed in Saccharomyces cerevisiae. The active enzyme was purified to near-homogeneity (purification factor approximately 1400-fold) by means of hydroxyapatite and anion-exhange chromatography. The purified glycolate oxidase is nonfluorescent and has absorbance peaks at 448 (epsilon = 9200 M-1 cm-1) and 346 nm in 0.1 M phosphate buffer, pH 8.3. The large bathochromic shift of the near-UV band indicates that the N(3) position is deprotonated at pH 8.3. A pH titration revealed that the pK of the N(3) is shifted from 10.3 in free flavin to 6.4 in glycolate oxidase. Glycolate oxidase is competitively inhibited by oxalate with a K(d) of 0.24 mM at 4-degrees-C in 0.1 M phosphate buffer, pH 8.3. Three pieces of evidence demonstrate that glycolate oxidase stabilizes a negative charge at the N(1)-C(2 = O) locus: the enzyme forms a tight sulfite complex with a K(d) of 2.7 x 10(-7) M and stabilizes the anionic flavosemiquinone and the benzoquinoid form of 8-mercapto-FMN. Steady-state analysis at pH 8.3, 4-degrees-C, yielded a K(m) = 1 x 10(-3) M for glycolate and K(m) = 2.1 x 10(-4) M for oxygen. The trunover number has been determined to be 20 s-1. Stopped-flow studies of the reductive (k = 25 s-1) and oxidative (k = 8.5 x 10(4) M-1 s-1) half-reactions have identified the reduction of glycolate oxidase to be the rate-limiting step. C1 UNIV MICHIGAN,SCH MED,DEPT BIOL CHEM,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. FU NIGMS NIH HHS [GM-11106] NR 39 TC 57 Z9 59 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 7 PY 1991 VL 30 IS 18 BP 4612 EP 4619 DI 10.1021/bi00232a036 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FK814 UT WOS:A1991FK81400036 PM 1850628 ER PT J AU ZHOU, TQ RADZIMSKI, Z PATNAIK, B ROZGONYI, GA SOPORI, B AF ZHOU, TQ RADZIMSKI, Z PATNAIK, B ROZGONYI, GA SOPORI, B TI CONDUCTIVITY-TYPE INVERSION FOLLOWING LOW-ENERGY HYDROGEN IMPLANTATION SO APPLIED PHYSICS LETTERS LA English DT Article ID SINGLE-CRYSTAL SILICON; PASSIVATION; IMPURITIES; DEFECTS AB A surface conductivity-type inversion has been observed following low-energy (400 eV), high-dose, hydrogen implantation of p-type silicon. Detailed structural, chemical, and electrical examination of the surface revealed that the inversion resulted from hydrogen forming n-type complexes with extended defects. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP ZHOU, TQ (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695, USA. NR 13 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 6 PY 1991 VL 58 IS 18 BP 1985 EP 1987 DI 10.1063/1.105040 PG 3 WC Physics, Applied SC Physics GA FK188 UT WOS:A1991FK18800019 ER PT J AU MATSUYAMA, A LEE, TSH AF MATSUYAMA, A LEE, TSH TI UNITARY MESON-EXCHANGE CALCULATION OF THE PI+D REVERSIBLE PP REACTION SO NUCLEAR PHYSICS A LA English DT Article ID NN-NN SYSTEMS; NUCLEON-NUCLEON-SCATTERING; PION-PRODUCTION THRESHOLD; INTERMEDIATE ENERGIES; DEUTERON SCATTERING; 3-BODY CALCULATION; 2-NUCLEON SYSTEM; UNIFIED THEORY; CHANNELS; MODEL AB The pi+d <--> pp reaction is studied within a unitary meson-exchange pi-NN model which was developed in our previous studies of NN and pi-d scattering. The predicted total cross sections are about 3/4 of the data in the DELTA resonance region. The calculated amplitudes in J-pi = 2+, 3- channels reproduce the resonant counter-clockwise behavior of Bugg's amplitude analysis. The predicted pp --> pi-d angular distributions and analyzing powers are, however, only in qualitative agreement with the data. The dynamical content of our calculations is analyzed and compared with some of the previous approaches. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP MATSUYAMA, A (reprint author), SHIZUOKA UNIV,FAC LIBERAL ARTS,HAMAMATSU,SHIZUOKA 432,JAPAN. NR 53 TC 10 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 6 PY 1991 VL 526 IS 3-4 BP 547 EP 559 DI 10.1016/0375-9474(91)90432-6 PG 13 WC Physics, Nuclear SC Physics GA FK991 UT WOS:A1991FK99100005 ER PT J AU BARNES, PD DIEBOLD, G FRANKLIN, G MAHER, C QUINN, B SEYDOUX, J KILIAN, K BESOLD, R EYRICH, W VONFRANKENBERG, R HOFMANN, A MALZ, D STINZING, F WOLDT, P BIRIEN, P DUTTY, W FRANZ, J HAMANN, N ROSSLE, E SCHLEDERMANN, H SCHMITT, H URBAN, HJ EISENSTEIN, RA HERTZOG, D OELERT, W SEHL, G BONNER, BE ERICSSON, G JOHANSSON, T OHLSSON, S BREUNLICH, WH PAWLEK, P AF BARNES, PD DIEBOLD, G FRANKLIN, G MAHER, C QUINN, B SEYDOUX, J KILIAN, K BESOLD, R EYRICH, W VONFRANKENBERG, R HOFMANN, A MALZ, D STINZING, F WOLDT, P BIRIEN, P DUTTY, W FRANZ, J HAMANN, N ROSSLE, E SCHLEDERMANN, H SCHMITT, H URBAN, HJ EISENSTEIN, RA HERTZOG, D OELERT, W SEHL, G BONNER, BE ERICSSON, G JOHANSSON, T OHLSSON, S BREUNLICH, WH PAWLEK, P TI STUDY OF THE REACTION PBARP-]LAMBDA-BAR-LAMBDA AT 1.546 AND 1.695 GEV/C SO NUCLEAR PHYSICS A LA English DT Article DE PBARP-]LAMBDA-BAR-LAMBDA; PLAB=1.546, 1.695 GEV/C; MEASURED SIGMA, SIGMA(THETA), POLARIZATION, AND SPIN CORRELATION ID CP INVARIANCE; DRIFT CHAMBERS; QUARK-MODEL; THRESHOLD; EXCHANGE; PBARP->LAMBDABARLAMBDA; POLARIZATION; DECAY; LEAR AB The PS185 experiment at the CERN Low Energy Antiproton Ring (LEAR) has studied the reaction pBARp --> LAMDA-BAR-LAMDA at several momenta. In this paper results from two runs with high statistics at 1.546 GeV/c and 1.695 GeV/c are described. Based on 4063 and 11362 analysed events, respectively, differential and integrated cross sections, polarizations and spin correlations are presented. The singlet fraction, extracted from the spin correlations, is consistent with zero at both momenta, showing that the LAMDA-BAR-LAMDA pairs are produced in a pure triplet state. A comparison of the decay asymmetry parameters of LAMDA and LAMDA-BAR reduces the upper limits for the violation of the CP invariance for this system. C1 CERN, CH-1211 GENEVA 23, SWITZERLAND. UNIV ERLANGEN NURNBERG, W-8520 ERLANGEN, GERMANY. UNIV FREIBURG, W-7800 FREIBURG, GERMANY. UNIV ILLINOIS, CHAMPAIGN, IL 61820 USA. FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH 1, GERMANY. UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. UNIV UPPSALA, S-75121 UPPSALA, SWEDEN. AUSTRIAN ACAD SCI, INST MITTELENERGIEPHYS, A-1090 VIENNA, AUSTRIA. RP BARNES, PD (reprint author), CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. RI Eyrich, Wolfgang /E-1730-2013 NR 51 TC 85 Z9 85 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 6 PY 1991 VL 526 IS 3-4 BP 575 EP 601 DI 10.1016/0375-9474(91)90434-8 PG 27 WC Physics, Nuclear SC Physics GA FK991 UT WOS:A1991FK99100007 ER PT J AU GARCIARECIO, C OSET, E SALCEDO, LL STROTTMAN, D LOPEZ, MJ AF GARCIARECIO, C OSET, E SALCEDO, LL STROTTMAN, D LOPEZ, MJ TI PION-NUCLEUS ELASTIC-SCATTERING IN A LOCAL APPROXIMATION TO THE DELTA-HOLE MODEL SO NUCLEAR PHYSICS A LA English DT Article ID MANY-BODY PROBLEM; RESONANCE REGION; INELASTIC-SCATTERING; ABSORPTION; HE-3; O-16 AB Differential elastic cross sections for pion-nucleus scattering are calculated by means of a handy and useful local approximation to a DELTA-h model based on a many-body expansions which provides a good description of the different pion-nuclear reaction cross sections. Good agreement with the experimental results is obtained in a wide range of energies around resonance and for different nuclei. The model is particularly useful for the study of heavy nuclei where the original DELTA-h model in its different versions becomes technically prohibitive. C1 MIT,CTR THEORET PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV VALENCIA,FAC FIS,DEPT FIS TEOR,VALENCIA,SPAIN. UNIV VALLADOLID,FAC CIENCIAS,DEPT FIS TEOR & FIS ATOM & NUCL,VALLADOLID,SPAIN. RI Salcedo, Lorenzo Luis/A-8845-2008; Lopez, Maria/H-2492-2013; Garcia-Recio, Carmen/A-7328-2008 OI Salcedo, Lorenzo Luis/0000-0002-3575-0341; Lopez, Maria/0000-0001-7698-9327; Garcia-Recio, Carmen/0000-0002-0442-3700 NR 40 TC 54 Z9 54 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 6 PY 1991 VL 526 IS 3-4 BP 685 EP 702 DI 10.1016/0375-9474(91)90438-C PG 18 WC Physics, Nuclear SC Physics GA FK991 UT WOS:A1991FK99100011 ER PT J AU BODMER, AR AF BODMER, AR TI RELATIVISTIC MEAN FIELD-THEORY OF NUCLEI WITH A VECTOR-MESON SELF-INTERACTION SO NUCLEAR PHYSICS A LA English DT Article ID MATTER; SYSTEMATICS; EQUATION; SURFACE; MODEL; STATE AB The inclusion of an isoscalar vector-meson quartic self-interaction (VSI) in the relativistic mean field theory of nuclei is discussed. We consider mostly nuclear matter, and in particular the equation of state (EOS) at T = 0. A VSI softens the EOS; in particular a moderately strong VSI gives an EOS similar to those obtained from nonrelativistic many-body calculations. Estimates of the spin-orbit splitting in light nuclei indicate that this splitting is not sensitive to the strength of the VSI and will depend mostly on the effective mass M*. The energy dependence of the optical potential gives M*/M congruent-to 0.6 independent of the VSI, and consistent with that obtained from the spin-orbit splitting. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP BODMER, AR (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680, USA. NR 18 TC 150 Z9 151 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 6 PY 1991 VL 526 IS 3-4 BP 703 EP 721 DI 10.1016/0375-9474(91)90439-D PG 19 WC Physics, Nuclear SC Physics GA FK991 UT WOS:A1991FK99100012 ER PT J AU KAZAKOV, VA AF KAZAKOV, VA TI EXTERNAL MATRIX FIELD PROBLEM AND NEW MULTICRITICALITIES IN (-2)-DIMENSIONAL RANDOM SURFACES SO NUCLEAR PHYSICS B LA English DT Article ID PLANAR RANDOM LATTICE; LARGE-N LIMIT; MODULI SPACE; GAUGE-THEORY; ISING-MODEL; DIMENSIONS; INTEGRATION; SERIES; QCD AB An external matrix field problem generalizing a discretized bosonic string field theory in (-2) dimensions is solved and analyzed in the double scaling limit. By an appropriate choice of the external field one can reach new multicritical regimes. A remarkable feature of a pth multicritical point is the absence of the contributions to the main singularity for the genera which are not multiples of p. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KAZAKOV, VA (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 54 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAY 6 PY 1991 VL 354 IS 2-3 BP 614 EP 624 DI 10.1016/0550-3213(91)90368-8 PG 11 WC Physics, Particles & Fields SC Physics GA FH571 UT WOS:A1991FH57100012 ER PT J AU ALDE, DM BAER, HW CAREY, TA GARVEY, GT KLEIN, A LEE, C LEITCH, MJ LILLBERG, JW MCGAUGHEY, PL MISHRA, CS MOSS, JM PENG, JC BROWN, CN COOPER, WE HSIUNG, YB ADAMS, MR GUO, R KAPLAN, DM MCCARTHY, RL DANNER, G WANG, MJ BARLETT, ML HOFFMANN, GW AF ALDE, DM BAER, HW CAREY, TA GARVEY, GT KLEIN, A LEE, C LEITCH, MJ LILLBERG, JW MCGAUGHEY, PL MISHRA, CS MOSS, JM PENG, JC BROWN, CN COOPER, WE HSIUNG, YB ADAMS, MR GUO, R KAPLAN, DM MCCARTHY, RL DANNER, G WANG, MJ BARLETT, ML HOFFMANN, GW TI NUCLEAR-DEPENDENCE OF THE PRODUCTION OF GAMMA-RESONANCES AT 800 GEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSVERSE-MOMENTUM DEPENDENCE; J-PSI-SUPPRESSION; QUARKONIUM PRODUCTION; COLLISIONS; J/PSI; QCD AB The yields of the 1S and the sum of the 2S and 3S Y resonances have been measured for 800-GeV protons incident on targets of H-2, C, Ca, Fe, and W. A significant nuclear dependence is seen in the yield per nucleon which, within errors, is the same for the Y(1S) and Y(2S + 3S) states. A large decrease in the relative yield from heavy nuclei is found for the range x(F) < 0. Significant nuclear dependence is also observed in the p(t) distribution. Differential cross sections for the Y(1S) for H-2 are presented over the ranges 0.24 less-than-or-equal-to p(t) less-than-or-equal-to 3.4 GeV/c and -0.15 less-than-or-equal-to x(F) less-than-or-equal-to 0.5. C1 FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. UNIV ILLINOIS, CHICAGO, IL 60680 USA. NO ILLINOIS UNIV, DE KALB, IL 60115 USA. SUNY STONY BROOK, STONY BROOK, NY 11794 USA. CASE WESTERN RESERVE UNIV, CLEVELAND, OH 44106 USA. UNIV TEXAS, AUSTIN, TX 78712 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. NR 25 TC 140 Z9 140 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 6 PY 1991 VL 66 IS 18 BP 2285 EP 2288 DI 10.1103/PhysRevLett.66.2285 PG 4 WC Physics, Multidisciplinary SC Physics GA FK183 UT WOS:A1991FK18300002 ER PT J AU PINDZOLA, MS GRIFFIN, DC BOTTCHER, C AF PINDZOLA, MS GRIFFIN, DC BOTTCHER, C TI VALIDITY OF TIME-DEPENDENT HARTREE-FOCK THEORY FOR THE MULTIPHOTON IONIZATION OF ATOMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID O-16 + O-16; HYDROGEN; DYNAMICS; FIELDS; XENON AB The validity of time-dependent Hartree-Fock (TDHF) theory is explored for the multiphoton ionization of atoms. The 3D electrostatic interaction is replaced by a 1D soft-core interaction which allows the construction of an N-electron atom in only N dimensions. For multiphoton ionization of a two-electron "He" atom in its ground state, we solve the time-dependent Schrodinger equation directly on a 2D lattice and solve a 1D formulation of the TDHF equations. The 2D lattice solution compares favorably with the frozen-core TDHF results, but not with the full nonlinear TDHF results. C1 ROLLINS COLL,DEPT PHYS,WINTER PK,FL 32789. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37830. RP PINDZOLA, MS (reprint author), AUBURN UNIV,DEPT PHYS,AUBURN,AL 36849, USA. NR 25 TC 82 Z9 82 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 MAY 6 PY 1991 VL 66 IS 18 BP 2305 EP 2307 DI 10.1103/PhysRevLett.66.2305 PG 3 WC Physics, Multidisciplinary SC Physics GA FK183 UT WOS:A1991FK18300007 ER PT J AU BATHA, SH MONTGOMERY, DS BRADLEY, KS DRAKE, RP ESTABROOK, K REMINGTON, BA AF BATHA, SH MONTGOMERY, DS BRADLEY, KS DRAKE, RP ESTABROOK, K REMINGTON, BA TI INTENSITY SCALING OF STIMULATED RAMAN FORWARD SCATTERING IN LASER-PRODUCED PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSTABILITY; BACKWARD AB Measurement of the intensity scaling of stimulated Raman forward scattering (SRFS) at one observation angle is presented. A single, high-intensity 527-nm laser beam excited the instability in a preformed plasma whose properties are such that the predicted gain for SRFS spans the range anticipated for high-gain laser-fusion experiments. At low intensities, the gain of the instability was consistent with convective theory. At intensities greater than 1 X 10(15) W/cm2, the instability saturated at a level of less than 10(11) W/sr nm cm2. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. RP BATHA, SH (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST,LIVERMORE,CA 94550, USA. RI Drake, R Paul/I-9218-2012; OI Drake, R Paul/0000-0002-5450-9844; Montgomery, David/0000-0002-2355-6242 NR 21 TC 17 Z9 17 U1 0 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 MAY 6 PY 1991 VL 66 IS 18 BP 2324 EP 2327 DI 10.1103/PhysRevLett.66.2324 PG 4 WC Physics, Multidisciplinary SC Physics GA FK183 UT WOS:A1991FK18300012 ER PT J AU XIAO, XD ZHU, XD DAUM, W SHEN, YR AF XIAO, XD ZHU, XD DAUM, W SHEN, YR TI ANISOTROPIC SURFACE-DIFFUSION OF CO ON NI(110) SO PHYSICAL REVIEW LETTERS LA English DT Article ID HARMONIC-GENERATION; MOLECULAR-DYNAMICS; SELF-DIFFUSION; DESORPTION; PLANE; TEMPERATURE; DEUTERIUM; HYDROGEN; TUNGSTEN; OXYGEN AB Anisotropic surface diffusion of CO on Ni(110) has been studied using the newly developed technique of optical second-harmonic diffraction from a laser-induced CO monolayer grating. Two distinct orthogonal diffusion channels, along [110BAR] and [001], were found. The measured diffusion coefficients yield the diffusion activation energies E(d)(110BAR) = 1.1 +/- 0.2 kcal/mol and E(d)(001) = 3.1 +/- 0.4 kcal/mol and the preexponential factors D0(110BAR) = (3.8 +/- 2.0) X 10(-9) cm2/sec and D0(001) = (4.8 +/- 4.4) X 10(-6) cm2/sec. The anisotropy in the surface diffusion appears to cross over at T approximately 160 K. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP XIAO, XD (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 28 TC 45 Z9 45 U1 1 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 MAY 6 PY 1991 VL 66 IS 18 BP 2352 EP 2355 DI 10.1103/PhysRevLett.66.2352 PG 4 WC Physics, Multidisciplinary SC Physics GA FK183 UT WOS:A1991FK18300019 ER PT J AU MARUYAMA, T GARWIN, EL PREPOST, R ZAPALAC, GH SMITH, JS WALKER, JD AF MARUYAMA, T GARWIN, EL PREPOST, R ZAPALAC, GH SMITH, JS WALKER, JD TI OBSERVATION OF STRAIN-ENHANCED ELECTRON-SPIN POLARIZATION IN PHOTOEMISSION FROM INGAAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARITY NON-CONSERVATION; EPITAXIAL LAYERS; QUANTUM-WELL; GAAS; PHOTOLUMINESCENCE; SUPERLATTICES; SPECTROSCOPY; SCATTERING; STRESS AB Electron-spin polarization in excess of 70% has been observed in photoemission from a 0.1-mu-m-thick epitaxial layer of InxGa1-xAs with x almost-equal-to 0.13 grown on a GaAs substrate. Under these conditions, the epitaxial layer is expected to be highly strained by the 0.9% lattice mismatch. The electron polarization and the quantum efficiency have been measured as a function of the excitation photon energy from 1.25 to 2.0 eV. A significant enhancement of the electron polarization occurs in the vicinity of 1.33 eV where the expected strain-induced level splitting permits optical excitation of a single-band transition. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,ELECTR RES LAB,BERKELEY,CA 94720. RP MARUYAMA, T (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 27 TC 89 Z9 89 U1 0 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 MAY 6 PY 1991 VL 66 IS 18 BP 2376 EP 2379 DI 10.1103/PhysRevLett.66.2376 PG 4 WC Physics, Multidisciplinary SC Physics GA FK183 UT WOS:A1991FK18300025 ER PT J AU ANDERSON, IS BERK, NF RUSH, JJ UDOVIC, TJ BARNES, RG MAGERL, A RICHTER, D AF ANDERSON, IS BERK, NF RUSH, JJ UDOVIC, TJ BARNES, RG MAGERL, A RICHTER, D TI RAPID LOW-TEMPERATURE HOPPING OF HYDROGEN IN A PURE METAL - THE SCHX SYSTEM - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 NATL INST STAND & TECHNOL,MAT SCI & ENGN LAB,GAITHERSBURG,MD 20899. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. INST FESTKORPERFORSCH KERNFORSCHUNGSANLAGE,W-6170 JULICH,GERMANY. RP ANDERSON, IS (reprint author), PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RI Richter, Dieter/H-3701-2013; Magerl, Andreas/E-1797-2013 OI Richter, Dieter/0000-0003-0719-8470; NR 1 TC 0 Z9 0 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 MAY 6 PY 1991 VL 66 IS 18 BP 2415 EP 2415 DI 10.1103/PhysRevLett.66.2415 PG 1 WC Physics, Multidisciplinary SC Physics GA FK183 UT WOS:A1991FK18300037 ER PT J AU ARONSON, MC ALDISSI, M ARMES, SP THOMPSON, JD AF ARONSON, MC ALDISSI, M ARMES, SP THOMPSON, JD TI HIGH-PRESSURE CONDUCTIVITY AND MORPHOLOGY OF CONDUCTING POLYMER COLLOIDS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID ELECTRICAL-CONDUCTIVITY; POLYPYRROLE PARTICLES; DISPERSIONS; STABILIZERS; DEPENDENCE; TRANSPORT C1 CHAMPLAIN CABLE CORP,WINOOSKI,VT 05404. UNIV SUSSEX,SCH CHEM & MOLEC SCI,BRIGHTON BN1 9QJ,E SUSSEX,ENGLAND. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP ARONSON, MC (reprint author), UNIV MICHIGAN,HARRISON M RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. OI Armes, Steven/0000-0002-8289-6351 NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 6 PY 1991 VL 41 IS 3 BP 837 EP 842 DI 10.1016/0379-6779(91)91507-7 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV271 UT WOS:A1991FV27100012 ER PT J AU POPLAWSKI, J EHRENFREUND, E CROMACK, K EPSTEIN, AJ FRANK, AJ AF POPLAWSKI, J EHRENFREUND, E CROMACK, K EPSTEIN, AJ FRANK, AJ TI PHOTOEXCITED DEFECTS IN POLY(3-METHYLTHIOPHENE) - LIGHT-INDUCED ELECTRON-SPIN-RESONANCE AND PHOTOINDUCED ABSORPTION SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID POLYTHIOPHENE; FILMS AB Light induced electron spin resonance (LESR) and photoinduced absorption (PA) are reported for poly(3-methylthiophene) (P3MT). The LESR is composed of a single line at g congruent-to 2 whose position, width and intensity are dependent on the exciting photon energy, h-omega-L. The LESR line intensity shows a sharp peak at 2.05 eV, where the line is the narrowest and it has the smallest g. The PA spectrum is composed of infrared active vibrations (IRAV) absorption bands and two midgap electronic bands, at 0.39 and 1.28 eV. The intensity of these three features as a function of h-omega-L is similar to each other and shows a sharp peak at 2.10 eV. Based on these observations, the possible spin-charge relationships for the photoinduced defects are discussed. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. SOLAR ENERGY RES INST,GOLDEN,CO 80401. TECHNION ISRAEL INST TECHNOL,INST SOLID STATE,IL-32000 HAIFA,ISRAEL. RP POPLAWSKI, J (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL. RI Ehrenfreund, Eitan/B-6680-2008 NR 6 TC 4 Z9 4 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 6 PY 1991 VL 41 IS 3 BP 1225 EP 1229 DI 10.1016/0379-6779(91)91593-Y PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV271 UT WOS:A1991FV27100098 ER PT J AU AUERBACH, I CARNICOM, ML AF AUERBACH, I CARNICOM, ML TI SORPTION OF WATER BY NYLON-66 AND KEVLAR-29 - EQUILIBRIA AND KINETICS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID POLYMERS AB The sorption of water by nylon 66 and Kevlar 29 fabrics was studied over a range of 20-98% relative humidities at 27-degrees-C. Equilibrium and rate relationships were developed from the data in this study and from nylon 66 and nylon 6 data of other studies involving fiber and film. The ratio of sorbed moisture to amide concentration is, on average and at high relative humidities, one water molecule per amide unit. The nylon equilibrium data show that there exist threshold relative humidities above and below which sorption properties differ. One threshold is correlated with the glass transition. Another is identified in the glassy state of nylon 6 in which moisture is tightly bound. The equilibrium constant values are highest and the moisture is most tightly bound at very low humidities, and the values are lowest in the plastic region at high humidities. NMR, DSC, and mechanical property data from others are correlated with the sorption discontinuities observed in this study. Rate data indicate that sorption is a diffusion-controlled process. RP AUERBACH, I (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 24 TC 14 Z9 15 U1 2 U2 10 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD MAY 5 PY 1991 VL 42 IS 9 BP 2417 EP 2427 DI 10.1002/app.1991.070420907 PG 11 WC Polymer Science SC Polymer Science GA FG308 UT WOS:A1991FG30800007 ER PT J AU UEMURA, Y LEE, TC SNYDER, F AF UEMURA, Y LEE, TC SNYDER, F TI A COENZYME A-INDEPENDENT TRANSACYLASE IS LINKED TO THE FORMATION OF PLATELET-ACTIVATING-FACTOR (PAF) BY GENERATING THE LYSO-PAF INTERMEDIATE IN THE REMODELING PATHWAY SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID POLYMORPHONUCLEAR LEUKOCYTES; ARACHIDONIC-ACID; LYSOPHOSPHOLIPIDS; PHOSPHOLIPIDS; BIOSYNTHESIS; NEUTROPHILS AB The remodeling pathway for the biosynthesis of platelet-activating factor (PAF) consists of the following reaction sequence: alkylacylglycerophosphocholine --> lyso-PAF --> PAF. Results presented in this article describe a novel transacylase activity that generates the lyso-PAF intermediate, which can then be acetylated to form PAF. Ethanolamine-containing lysoplasmalogens, 1-acyl-2-lyso-sn-glycero-3-phosphoethanolamine, alkyllysophosphoethanolamine, unlabeled lyso-PAF, 1-acyl-2-lyso-GPC, where GPC is sn-glycero-3-phosphocholine, and choline-containing lysoplasmalogens were all able to stimulate the formation of [H-3]lyso-PAF from a [H-3]alkylacyl-GPC precursor pool associated with HL-60 cell (granulocytic type) membranes. Other glycerolipids containing free hydroxyl groups (3-alkyl-2-lyso-sn-glycero-1-phosphocholine, lysophosphatidylserine, lysophosphatidylinositol, diacylglycerols, alkylglycerols, and monoacylglycerols), cholesterol, phosphatidylcholine, and phosphatidylethanolamine had no stimulatory effect on the release of [H-3]lyso-PAF from the prelabled membranes under identical incubation conditions. The observed transacylase reaction is directly coupled to PAF production, since the addition of a lysoethanolamine plasmalogen preparation to HL-60 membranes in the presence of [C-14]acetyl-CoA stimulated PAF formation; under these conditions the lysoethanolamine plasmalogen was acylated. The transacylase responsible for the release of lyso-PAF from the membrane-associated alkylacyl-GPC was not affected by Ca2+, EGTA, or a known phospholipase A2 inhibitor, p-bromophenacyl bromide. The fact that the unnatural analog of lyso-PAF, lysophosphatidylserine, and lysophosphatidylinositol did not influence transacylase activity, whereas detergents such as deoxycholate and Triton X-100 inhibited the activity, demonstrated the observed stimulatory effects of the choline- and ethanolamine-containing lysophospholipids on the formation of [H-3]lyso-PAF from [H-3]alkylacyl-GPC were not due to any detergent property of these lysophospholipids. Thus, we conclude a CoA-independent transacylase (possessing phospholipase A2/acyltransferase activities) can be responsible for the formation of the lyso-PAF intermediate in the remodeling route of PAF biosynthesis. C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,POB 117,OAK RIDGE,TN 37831. FU PHS HHS [27109-10] NR 21 TC 115 Z9 119 U1 0 U2 3 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAY 5 PY 1991 VL 266 IS 13 BP 8268 EP 8272 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FK441 UT WOS:A1991FK44100051 PM 2022643 ER PT J AU CONBOY, JG CHAN, JY CHASIS, JA KAN, YW MOHANDAS, N AF CONBOY, JG CHAN, JY CHASIS, JA KAN, YW MOHANDAS, N TI TISSUE-SPECIFIC AND DEVELOPMENT-SPECIFIC ALTERNATIVE RNA SPLICING REGULATES EXPRESSION OF MULTIPLE ISOFORMS OF ERYTHROID MEMBRANE-PROTEIN 4.1 SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID SKELETAL PROTEIN-4.1; MAMMALIAN-CELLS; BAND 4.1; VARIANTS; CLONING; ACTIN; DIFFERENTIATION; HOMOLOGY; SEQUENCE; BIOLOGY AB Protein 4.1, a multifunctional structural protein originally described as an 80-kDa component of the erythroid membrane skeleton, exhibits tissue- and development-specific heterogeneity in molecular weight, subcellular localization, and primary amino acid sequence. Earlier reports suggested that some of this impressive heterogeneity is generated by alternative RNA splicing (Conboy, J. G., Chan, J., Mohandas, N., and Kan, Y. W. (1988) Proc. Natl. Acad. Sci. U. S. A. 85, 9062-9065; Tang, T. K., Leto, T., Marchesi, V. T., and Benz, E. J. (1990) J. Cell Biol. 110, 617-624). We have now completed a systematic analysis of 4.1 mRNA isoforms expressed in erythroid cells, and have generated an "alternative splicing map" which summarizes diagrammatically a multitude of polypeptide isoforms potentially generated by combinatorial splicing of nine alternative exons. Complex 5' splicing events yield mRNA isoforms that may initiate translation at different sites and thus generate elongated or truncated NH2 termini; elongated approximately 135-kDa and prototypical approximately 80-kDa species were detected in both erythrocytes and T-lymphocytes, but in very different ratios. Among the functional domains of 4.1 responsible for interaction with other membrane skeletal elements, four variants of the 10-kDa spectrin-actin-binding region and four variants of the putative 30-kDa glycophorin-binding region are predicted. Developmentally controlled alternative RNA splicing in the spectrin-actin-binding region may help regulate remodeling of membrane architecture and mechanical properties that occur during erythropoiesis. C1 UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,HOWARD HUGHES MED INST,SAN FRANCISCO,CA 94143. RP CONBOY, JG (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,1 CYCLOTRON RD,BLDG 74-157,BERKELEY,CA 94720, USA. FU NIDDK NIH HHS [DK 32094] NR 54 TC 133 Z9 134 U1 0 U2 2 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAY 5 PY 1991 VL 266 IS 13 BP 8273 EP 8280 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FK441 UT WOS:A1991FK44100052 PM 2022644 ER PT J AU BERTRANDBURGGRAF, E SELBY, CP HEARST, JE SANCAR, A AF BERTRANDBURGGRAF, E SELBY, CP HEARST, JE SANCAR, A TI IDENTIFICATION OF THE DIFFERENT INTERMEDIATES IN THE INTERACTION OF (A)BC EXCINUCLEASE WITH ITS SUBSTRATES BY DNASE-I FOOTPRINTING ON 2 UNIQUELY MODIFIED OLIGONUCLEOTIDES SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE (A)BC EXCINUCLEASE; FOOTPRINTING; DAMAGE RECOGNITION ID REPRESSOR-OPERATOR INTERACTION; UVRABC EXCISION NUCLEASE; ESCHERICHIA-COLI; PROTEIN INTERACTIONS; ABC EXCINUCLEASE; REPAIR; COMPLEX; STRAND; ACID; UVRB C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT CHEM BIODYNAM,BERKELEY,CA 94720. RP BERTRANDBURGGRAF, E (reprint author), UNIV N CAROLINA,SCH MED,DEPT BIOCHEM & BIOPHYS,CHAPEL HILL,NC 27599, USA. FU NIEHS NIH HHS [ES05486]; NIGMS NIH HHS [GM32833] NR 28 TC 60 Z9 60 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 5 PY 1991 VL 219 IS 1 BP 27 EP 36 DI 10.1016/0022-2836(91)90854-Y PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FL034 UT WOS:A1991FL03400004 PM 2023258 ER PT J AU STUDIER, FW AF STUDIER, FW TI USE OF BACTERIOPHAGE-T7 LYSOZYME TO IMPROVE AN INDUCIBLE T7 EXPRESSION SYSTEM SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE T7 LYSOZYME; T7 RNA POLYMERASE; T7 EXPRESSION SYSTEM; TOXIC TARGET GENES; CLONED GENES ID RNA-POLYMERASE; NUCLEOTIDE-SEQUENCE; GENE 1.2; DNA RP STUDIER, FW (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 23 TC 616 Z9 628 U1 3 U2 48 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 5 PY 1991 VL 219 IS 1 BP 37 EP 44 DI 10.1016/0022-2836(91)90855-Z PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FL034 UT WOS:A1991FL03400005 PM 2023259 ER PT J AU DUBENDORFF, JW STUDIER, FW AF DUBENDORFF, JW STUDIER, FW TI CONTROLLING BASAL EXPRESSION IN AN INDUCIBLE T7 EXPRESSION SYSTEM BY BLOCKING THE TARGET T7 PROMOTER WITH LAC REPRESSOR SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE T7 RNA POLYMERASE; T7 EXPRESSION SYSTEM; T7 PROMOTERS; LAC REPRESSOR; TOXIC TARGET GENES ID BACTERIOPHAGE-T7 RNA-POLYMERASE; CLONING VEHICLES; NUCLEOTIDE-SEQUENCE; ESCHERICHIA-COLI; GENE; DNA; CONSTRUCTION; TRANSCRIPTION; OPERATORS; PROTEIN C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM21872] NR 29 TC 273 Z9 287 U1 4 U2 60 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 5 PY 1991 VL 219 IS 1 BP 45 EP 59 DI 10.1016/0022-2836(91)90856-2 PG 15 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FL034 UT WOS:A1991FL03400006 PM 1902522 ER PT J AU DUBENDORFF, JW STUDIER, FW AF DUBENDORFF, JW STUDIER, FW TI CREATION OF A T7 AUTOGENE - CLONING AND EXPRESSION OF THE GENE FOR BACTERIOPHAGE-T7 RNA-POLYMERASE UNDER CONTROL OF ITS COGNATE PROMOTER SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE AUTOGENE; T7 AUTOGENE; T7 RNA POLYMERASE; LAC REPRESSOR; T7 LYSOZYME ID NUCLEOTIDE-SEQUENCE; SYSTEM C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM21872] NR 16 TC 64 Z9 66 U1 0 U2 3 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 5 PY 1991 VL 219 IS 1 BP 61 EP 68 DI 10.1016/0022-2836(91)90857-3 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FL034 UT WOS:A1991FL03400007 PM 2023261 ER PT J AU JIANG, F KIM, SH AF JIANG, F KIM, SH TI SOFT DOCKING - MATCHING OF MOLECULAR-SURFACE CUBES SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE MOLECULAR DOCKING; SOFT DOCKING; MOLECULAR SURFACE COMPLEMENTARITY; CUBE REPRESENTATION OF MOLECULAR SURFACE; MOLECULAR RECOGNITION ID SOLVENT-ACCESSIBLE SURFACES; PROTEIN-PROTEIN-INTERACTION; EGG-WHITE LYSOZYME; DIHYDROFOLATE-REDUCTASE; 3-DIMENSIONAL STRUCTURE; SHAPE COMPLEMENTARITY; ENERGY REFINEMENT; LIGAND-BINDING; NUCLEIC-ACIDS; CYTOCHROME-C C1 UNIV CALIF BERKELEY,GRAD GRP BIOPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 48 TC 289 Z9 298 U1 2 U2 14 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD MAY 5 PY 1991 VL 219 IS 1 BP 79 EP 102 DI 10.1016/0022-2836(91)90859-5 PG 24 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FL034 UT WOS:A1991FL03400009 PM 2023263 ER PT J AU KRESS, JD AF KRESS, JD TI ACCURATE 3-DIMENSIONAL QUANTUM SCATTERING CALCULATIONS FOR NE+H2+-]NEH++H SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DISCRETE VARIABLE REPRESENTATION; POTENTIAL-ENERGY SURFACES; TOTAL ANGULAR-MOMENTUM; REACTIVE SCATTERING; CROSS-SECTIONS; THERMAL ENERGIES; GROUND-STATE; MOLECULES; MECHANICS; DYNAMICS AB Accurate 3D coupled channel calculations are presented for the reaction Ne + H2+ --> NeH+ + H computed with the diatomics-in-molecules potential of Hayes and co-workers. Reaction probabilities for total angular momentum J = O and total energies up to 1.1 eV are reported. The hyperspherical formulation of Pack and Parker is used, and the adiabatic basis functions are generated using the discrete variable representation (DVR). The total reaction probabilities show much structure as a function of total energy, structure that is indicative of quantum dynamical resonances. The trend in the results agrees with that observed experimentally: vibrational energy is more effective than an equivalent amount of translational energy for promoting the reaction. RP KRESS, JD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET T-12 MS B268,LOS ALAMOS,NM 87545, USA. NR 33 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 3 PY 1991 VL 179 IS 5-6 BP 510 EP 516 DI 10.1016/0009-2614(91)87095-S PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FL741 UT WOS:A1991FL74100018 ER PT J AU WERST, DW TRIFUNAC, AD AF WERST, DW TRIFUNAC, AD TI STUDY OF RADICAL IONS IN THE CONDENSED PHASE BY FLUORESCENCE-DETECTED MAGNETIC-RESONANCE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Review ID ELECTRON-SPIN-RESONANCE; STILBENE-AMINE EXCIPLEXES; HEXAMETHYL-DEWAR BENZENE; PULSE-RADIOLYSIS; PHOTOCHEMICAL ADDITION; IONIZING-RADIATION; OPTICAL-DETECTION; ORGANIC SULFIDES; LINEAR ALKANES; FREON MATRICES AB Magnetic resonance studies of transient condensed-phase radical ions have been realized for the first time without the use of a stabilizing matrix. The occurrence, structure, and, reactivity of radical cations and radical anions in the condensed phase using time-resolved fluorescence-detected magnetic resonance (FDMR) is reviewed. FDMR observes the time-resolved EPR spectra of spin-correlated radical-ion pairs on the 10(-8)-10(-6) time scale. FDMR studies have elucidated the identity and fate of primary radical cations in saturated hydrocarbons, alcohols, and other solvent media exposed to ionizing or photoionizing radiation. In photoionization, FDMR allows the determination of the photophysical pathway, i.e., the photon order and the multiplicity of the state which is ionized. The formation of secondary radical cations via electron transfer from solutes to solvent radical cations allows the FDMR/pulse radiolysis method to study a wide range of organic radical cations. Radical-cation reactions that have been studied include unimolecular dissociation, charge transfer, aggregate formation, and ion-molecule reactions. Ion-molecule reactions such as proton transfer are the principal channels besides neutralization for radical-cation decay in the condensed phase. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 88 TC 33 Z9 33 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 2 PY 1991 VL 95 IS 9 BP 3466 EP 3477 DI 10.1021/j100162a007 PG 12 WC Chemistry, Physical SC Chemistry GA FK322 UT WOS:A1991FK32200007 ER PT J AU HANER, AN ROSS, PN AF HANER, AN ROSS, PN TI ELECTROCHEMICAL OXIDATION OF METHANOL ON TIN-MODIFIED PLATINUM SINGLE-CRYSTAL SURFACES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID FUEL-CELLS; ELECTROCATALYTIC OXIDATION; FORMIC-ACID; AD-ATOMS; ELECTRODES; CATALYSTS; METAL; STABILITY; SN AB To understand the role of tin as a promoter in the electrochemical oxidation of methanol, we have studied the geometric and electronic effect of tin atoms in different chemical states on/in the platinum surface by using single-crystal faces of the ordered alloy Pt3Sn and single-crystal faces of pure Pt modified by electrodeposited/adsorbed tin, i.e., the so-called adatom state. We found that none of the alloy surfaces were more effective catalysts than any of the pure platinum surfaces under the conditions of measurement employed here and that alloying platinum with tin to any extent significantly reduced the activity. As reported previously by others, we observed tin to spontaneously adsorb on platinum surfaces from dilute sulfuric acid supporting electrolyte containing Sn(II) in concentrations above ca. 5-mu-m. At a given concentration, the coverage by tin decreased as the atomic density of the platinum surface increased. However, we did not observe any enhancement of methanol oxidation on any platinum modified by this irreversibly adsorbed tin. We did observe a diffusion-limited enhancement on Pt(111) and on Pt(100) due to Sn(II) in the electrolyte at 1-mu-M concentration. At this concentration, tin did not appear to be adsorbed to any observable extent, and the catalysis appeared to occur via the direct interaction of a dissolved tin species with the surface. We propose a mechanism of catalysis that is a hybrid homogeneous-heterogeneous sequence based on known homogeneous Pt-Sn catalysts. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,MAT & CHEM RES DIV,BERKELEY,CA 94720. NR 37 TC 109 Z9 110 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 MAY 2 PY 1991 VL 95 IS 9 BP 3740 EP 3746 DI 10.1021/j100162a056 PG 7 WC Chemistry, Physical SC Chemistry GA FK322 UT WOS:A1991FK32200056 ER PT J AU TAVANI, M AF TAVANI, M TI ORBITAL EVOLUTION OF LOW-MASS X-RAY BINARIES DUE TO RADIATION DRIVEN MASS-TRANSFER SO NATURE LA English DT Article ID 4U 1820-30; CYGNUS-X-3; SYSTEMS; WINDS AB A LOW-MASS X-ray binary (LMXB) consists of a compact star, probably a neutron star, accreting mass from a low-mass (less-than-or-similar-to 1 M.) companion via an accretion disk. Of approximately 100 known LMXBs in the Galaxy, only four have stable enough X-ray modulations to have allowed the reliable determination of orbital period changes. For these four LMXBs, all of which have P(orb) less-than-or-similar-to 5.6 h, the measured values 1-4 of P(orb)/P(orb) disagree markedly with what would be expected for orbital evolution driven by angular momentum loss due to gravitational radiation, possibly supplemented by magnetic braking; the empirically derived timescale for orbital evolution is approximately 100 times less than expected. On the assumption that the observed period changes are secular, and not due to some longer-term periodic change, I argue here that the observed behaviour of LMXBs can be explained as the result of mass loss from the companion star caused by irradiation of the secondary star and accretion disk by the primary 5. The typical lifetime of a radiation-driven LMXB is expected to be approximately 10(6)-10(7) yr. This reduced evolutionary timescale can resolve the statistical discrepancy between the number of binary millisecond pulsars and of their presumed LMXB progenitors if about half of all the LMXBs are radiation-driven 5-7. C1 UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP TAVANI, M (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550, USA. OI Tavani, Marco/0000-0003-2893-1459 NR 29 TC 23 Z9 23 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAY 2 PY 1991 VL 351 IS 6321 BP 39 EP 41 DI 10.1038/351039a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FK193 UT WOS:A1991FK19300050 ER PT J AU CHISHOLM, MF PENNYCOOK, SJ AF CHISHOLM, MF PENNYCOOK, SJ TI STRUCTURAL ORIGIN OF REDUCED CRITICAL CURRENTS AT YBA2CU3O7-DELTA GRAIN-BOUNDARIES SO NATURE LA English DT Article ID SUPERCONDUCTORS; OXYGEN AB THE critical current density across individual grain boundaries in thin films of the high-T(c) superconductor YBa2Cu3O7-delta (YBCO) has been found 1-4 to be inversely proportional to lattice misorientation for tilts up to approximately 10-degrees. Reports of impurity segregation 5,6 at grain boundaries, and variations in the chemical stoichiometry 7,8, have led to the view that deviations from the ideal composition are responsible for the depressed superconducting order parameter at the boundary. Here we present images of YBCO grain boundaries obtained by a scanning transmission electron microscope in Z-contrast mode 9,10, which show that chemical segregation does not necessarily occur at these boundaries. A simple model of the strain associated with the grain-boundary dislocations provides a reasonable physical explanation of the suppressed superconductivity. The surprisingly large effect of strain implied by our model has implications beyond critical currents, for the physics and applications of any thin-film YBCO structures involving strained epitaxial layers. RP CHISHOLM, MF (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 23 TC 182 Z9 182 U1 6 U2 45 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAY 2 PY 1991 VL 351 IS 6321 BP 47 EP 49 DI 10.1038/351047a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FK193 UT WOS:A1991FK19300053 ER PT J AU KISSLINGER, LS JOHNSON, MB AF KISSLINGER, LS JOHNSON, MB TI LIGHT-FRONT NUCLEAR SHELL-MODEL - EMC EFFECT SO PHYSICS LETTERS B LA English DT Article ID DEEP-INELASTIC-SCATTERING; ELECTRON-SCATTERING; CROSS-SECTIONS; BOUND-STATES; DEUTERIUM; DYNAMICS; BINDING; HADRON; FORM; QCD AB We examine the effects of nuclear structure on deep inelastic scattering - the EMC effect - in a light-cone shell model. With instant-form and light-front formulations of inelastic structure functions which are currently widely used, we show that nuclear binding corrections for the EMC effect are much smaller in the latter case. To guarantee near-equivalent descriptions in the two formulations we employ a toy harmonic oscillator model of a two-nucleon nucleus in the laboratory system. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KISSLINGER, LS (reprint author), CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213, USA. NR 27 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 2 PY 1991 VL 259 IS 4 BP 416 EP 421 DI 10.1016/0370-2693(91)91649-G PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN126 UT WOS:A1991FN12600005 ER PT J AU JIANG, CL KUBONO, S IKEDA, N TANAKA, M KAWASHIMA, H FUCHI, Y KATAYAMA, I NOMURA, T PIEPER, SC AF JIANG, CL KUBONO, S IKEDA, N TANAKA, M KAWASHIMA, H FUCHI, Y KATAYAMA, I NOMURA, T PIEPER, SC TI STRONG MUTUAL EXCITATION OF ND-148+NE-20 SO PHYSICS LETTERS B LA English DT Article ID INELASTIC-SCATTERING; LI-7 AB The angular distribution for mutual excitation has been measured for Nd-148 + Ne-20 scattering. The colliding system studied was chosen for its very strong Coulomb coupling. Mutual excitation as strong as the single excitation of Ne-20 2+ has been observed, which is much stronger than in previously measured cases. The angular distribution of the mutual excitation is not bell shaped and is similar to that of the Ne 2+ state. Coupled-channels calculations fail to reproduce the data. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP JIANG, CL (reprint author), UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. NR 20 TC 2 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 2 PY 1991 VL 259 IS 4 BP 427 EP 430 DI 10.1016/0370-2693(91)91651-B PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN126 UT WOS:A1991FN12600007 ER PT J AU YAMAGISHI, K AF YAMAGISHI, K TI A HAMILTONIAN-STRUCTURE OF KP HIERARCHY, W1+INFINITY ALGEBRA, AND SELF-DUAL GRAVITY SO PHYSICS LETTERS B LA English DT Article ID EXTENDED VIRASORO ALGEBRAS; FIELD-THEORIES; W-INFINITY; YANG-MILLS; SU(INFINITY); EQUATIONS; CONSTRUCTION; SYMMETRIES; KORTEWEG; MODELS AB It is well known that the second hamiltonian structures for the (N-1)th generalized KdV hierarchy (of A(n) type) are isomorphic to the classical W(N) algebra for finite N(greater-than-or-equal-to 2). Here we construct an analogue of the first structures for the KP hierarchy in its pseudo-differential operator formalism L = D + D-1-upsilon-1 + D-2-upsilon-2 + D-3-upsilon-3 + ..., and show that the corresponding Poisson brackets are given by the W1 + infinity algebra with no central charge. Its implication to the quantization of 4D self-dual gravity is briefly discussed. RP YAMAGISHI, K (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-412,LIVERMORE,CA 94550, USA. NR 53 TC 51 Z9 51 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 2 PY 1991 VL 259 IS 4 BP 436 EP 441 DI 10.1016/0370-2693(91)91653-D PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN126 UT WOS:A1991FN12600009 ER PT J AU ELLIS, RK AF ELLIS, RK TI RATES FOR TOP QUARK PRODUCTION SO PHYSICS LETTERS B LA English DT Article ID PROTON STRUCTURE FUNCTIONS; DEEP-INELASTIC-SCATTERING; HADRONIC COLLISIONS; HIGH Q2; QCD; F2(X,Q2); JET AB Total rates for the production of top quarks at Tevatron energies are presented and compared with earlier work. RP ELLIS, RK (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 20 TC 38 Z9 38 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 2 PY 1991 VL 259 IS 4 BP 492 EP 496 DI 10.1016/0370-2693(91)91663-G PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FN126 UT WOS:A1991FN12600019 ER PT J AU BAZANT, ZP KAZEMI, MT AF BAZANT, ZP KAZEMI, MT TI SIZE EFFECT ON DIAGONAL SHEAR FAILURE OF BEAMS WITHOUT STIRRUPS SO ACI STRUCTURAL JOURNAL LA English DT Article DE BEAMS (SUPPORTS); BRITTLENESS; CRACKING (FRACTURING); CRACK PROPAGATION; FAILURE; FRACTURE PROPERTIES REINFORCED CONCRETE; SHEAR PROPERTIES; STRUCTURAL DESIGN; TESTS ID FRACTURE ENERGY; CONCRETE; BRITTLENESS; STRENGTH AB Presents the results of recent tests on diagonal shear failure of reinforced concrete beams without stirrups. The beams are geometrically similar, and the size range is 1:16. The test results indicate a significant size effect and show a good agreement with Bazant's law for size effect. Scatter of the test results is much lower than that previously found by studying extensive test data from the literature, which have not been obtained on geometrically similar beams. The tests also show that preventing bond slip of the longitudinal bars (by providing end anchorage with hooks) causes an increase of the brittleness number of the beam. It is concluded that the current design approach, which is intended to provide safety against the diagonal crack initiation load, should be replaced or supplemented by a design approach based on the ultimate load, in which a size effect of the fracture mechanics type, due to release of stored energy, must be taken into account. A relatively simple adjustment of the existing formula might be sufficient for design, although determination of the brittleness number of the beam deserves more study. C1 NORTHWESTERN UNIV, CTR CONCRETE & GEOMAT, EVANSTON, IL 60201 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. SHARIF UNIV TECHNOL, TEHRAN, IRAN. RI Bazant, Zdenek/B-6743-2009 NR 21 TC 120 Z9 123 U1 3 U2 9 PU AMER CONCRETE INST PI FARMINGTON HILLS PA 38800 COUNTRY CLUB DR, FARMINGTON HILLS, MI 48331 USA SN 0889-3241 J9 ACI STRUCT J JI ACI Struct. J. PD MAY-JUN PY 1991 VL 88 IS 3 BP 268 EP 276 PG 9 WC Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary SC Construction & Building Technology; Engineering; Materials Science GA FL095 UT WOS:A1991FL09500002 ER PT J AU HELLQUIST, B BENGTSSON, LA HOLMBERG, B HEDMAN, B PERSSON, I ELDING, LI AF HELLQUIST, B BENGTSSON, LA HOLMBERG, B HEDMAN, B PERSSON, I ELDING, LI TI STRUCTURES OF SOLVATED CATIONS OF PALLADIUM(II) AND PLATINUM(II) IN DIMETHYL-SULFOXIDE, ACETONITRILE AND AQUEOUS-SOLUTION STUDIED BY EXAFS AND LAXS SO ACTA CHEMICA SCANDINAVICA LA English DT Article ID PRESSURE NMR KINETICS; X-RAY-DIFFRACTION; CRYSTAL-STRUCTURE; WATER-EXCHANGE; AQUA COMPLEXES; VARIABLE-TEMPERATURE; CHLORO-AQUA; MECHANISM; TETRAAQUAPLATINUM(II); DIMETHYLSULFOXIDE AB X-Ray absorption edge and EXAFS spectra of the solvated cations of platinum(II) in water, dimethyl sulfoxide and acetonitrile and of palladium(II) in dimethyl sulfoxide have been recorded and analyzed. The cations are four-coordinated. Pt-O in Pt(H2O)4(2+) is 2.01(1) angstrom and Pt-N in Pt(CH3CN)4(2+) is 2.00(1) angstrom. The dimethyl sulfoxide solvated cations of both platinum and palladium contain two sulfur- and two oxygen-bonded ligands with Pt-O 2.07(2), Pt-S 2.21(2), Pd-O 2.04(2), and Pd-S 2.23(2) angstrom, probably in a square-planar cis-arrangement, as in the solid state. Large-angle X-ray scattering (LAXS) studies of the platinum(II) dimethyl sulfoxide solvated cation in a solution of the triflate salt gave Pt-O 2.07(1) and Pt-S 2.20(1) angstrom and in a solution of the tetrafluoroborate salt Pt-O 2.07(2) and Pt-S 2.21(5) angstrom, in good agreement with the EXAFS results. Neither technique gave any support for axially bound solvent molecules in addition to the four in the assumed square coordination plane. C1 LUND UNIV,CTR CHEM,POB 124,S-22100 LUND,SWEDEN. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. SWEDISH UNIV AGR SCI,DEPT CHEM,S-75007 UPPSALA,SWEDEN. NR 47 TC 45 Z9 45 U1 3 U2 10 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0904-213X J9 ACTA CHEM SCAND JI Acta Chem. Scand. PD MAY PY 1991 VL 45 IS 5 BP 449 EP 455 DI 10.3891/acta.chem.scand.45-0449 PG 7 WC Biochemistry & Molecular Biology; Chemistry, Multidisciplinary SC Biochemistry & Molecular Biology; Chemistry GA FZ089 UT WOS:A1991FZ08900003 ER PT J AU HOU, PY STRINGER, J AF HOU, PY STRINGER, J TI ROOM-TEMPERATURE STRAINS IN CR2O3 SCALES FORMED AT ELEVATED-TEMPERATURES ON NI-25 WT-PERCENT CR AND Y-DOPED AND AL-DOPED NI-25WT-PERCENT CR SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID ADHERENCE; OXIDATION; ELEMENTS; ALLOYS AB Ni-25wt%Cr, Ni-25wt%Cr-1wt%Al and Ni-25wt%Cr-0.2wt%Y alloys were oxidized at 1000-degrees-C in O2 to form similar thicknesses of Cr2O3 scales. After cooling to ambient temperatures, the residual strains in these oxide films were measured using X-ray diffraction, and qualitative indications of the interfacial strength were obtained using a micro-identation technique. Compressive elastic strains of the order of 0.4% were measured on the Y- and the Al-doped alloys. This value agees well with calculated thermal strains which arose from cooling. Only 0.1% compressive elastic strains were observed for the undoped Ni-25Cr alloy. Localized scale buckling and separation from the substrate is believed to have allowed relaxation of the strain in this case. The Y- and the Al-doped alloys on the other hand, have extremely strong scale/alloy interfaces, and therefore were able to retain higher strain levels. C1 ELECT POWER RES INST, PALO ALTO, CA 94304 USA. RP HOU, PY (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV MAT & CHEM SCI, BERKELEY, CA 94720 USA. NR 20 TC 26 Z9 26 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD MAY PY 1991 VL 39 IS 5 BP 841 EP 849 DI 10.1016/0956-7151(91)90284-8 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FH777 UT WOS:A1991FH77700012 ER PT J AU SHIN, HK CHI, KM HAMPDENSMITH, MJ KODAS, TT FARR, JD PAFFETT, M AF SHIN, HK CHI, KM HAMPDENSMITH, MJ KODAS, TT FARR, JD PAFFETT, M TI SELECTIVE LOW-TEMPERATURE CHEMICAL VAPOR-DEPOSITION OF COPPER FROM (HEXAFLUOROACETYLACETONATO)COPPER(I)TRIMETHYLPHOSPHINE, (HFA)CUP(ME)3 SO ADVANCED MATERIALS LA English DT Note ID FILMS AB Communication: The deposition of smooth, dense, fine-grained, low resistivity copper films has been achieved at temperatures as low as 150-degrees-C from an organometallic precursor. It is suggested that the films (see figure) are formed as the result of thermal disproportionation of the precursor without decomposition of the ligand. Substrate-selective deposition at rates of over 1000 angstrom/min is demonstrated. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 21 TC 79 Z9 79 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD MAY PY 1991 VL 3 IS 5 BP 246 EP 248 PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA FN467 UT WOS:A1991FN46700004 ER PT J AU BALACHANDRAN, U POEPPEL, RB HUNT, JG AF BALACHANDRAN, U POEPPEL, RB HUNT, JG TI HOT EXTRUSION OF HIGH-TEMPERATURE SUPERCONDUCTING OXIDES SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Article ID WIRES C1 POLYMET CORP,CINCINNATI,OH 45246. RP BALACHANDRAN, U (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7812 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD MAY PY 1991 VL 70 IS 5 BP 813 EP 816 PG 4 WC Materials Science, Ceramics SC Materials Science GA FK912 UT WOS:A1991FK91200006 ER PT J AU NELSON, ME FISHER, EC DILMANIAN, FA DALLAL, GE EVANS, WJ AF NELSON, ME FISHER, EC DILMANIAN, FA DALLAL, GE EVANS, WJ TI A 1-Y WALKING PROGRAM AND INCREASED DIETARY CALCIUM IN POSTMENOPAUSAL WOMEN - EFFECTS ON BONE SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Article DE EXERCISE; DIET; OSTEOPOROSIS; BODY COMPOSITION; DUAL-PHOTON ABSORPTIOMETRY; SINGLE-PHOTON ABSORPTIOMETRY; QUANTITATIVE COMPUTED TOMOGRAPHY; INVIVO NEUTRON-ACTIVATION ANALYSIS ID DUAL-PHOTON ABSORPTIOMETRY; LIQUID-CHROMATOGRAPHY; EXERCISE; OSTEOPOROSIS; SUPPLEMENTATION; PHOSPHORUS; DENSITY; RATES; SPINE; ASSAY AB The effects of a supervised 1-y walking program and increased dietary calcium (milk supplement, 831 mg/d, vs placebo drink, 41 mg/d) on bones were examined in 36 postmenopausal women (60.2 +/- 6.5 y). Trabecular bone-mineral density (BMD) of the lumbar spine (L1-L3), measured by computed tomography, increased by 0.5% in exercising women (n = 18) and decreased by 7.0% in sedentary women (n = 18; P = 0.02). Femoral-neck BMD measured by dual-photon absorptiometry (DPA) increased by 2.0% in women consuming high dietary calcium (n = 18) and decreased by 1.1% in those on moderate calcium intake (n = 18; P = 0.001). Neither exercise nor dietary calcium had an effect on lumbar spine (L2-L4) measured by DPA, distal radius measured by single-photon absorptiometry, or total body calcium measured by in vivo neutron activation. The varying proportions and rates of turnover of trabecular and cortical bone from one site to another suggest that exercise and high dietary calcium may preferentially alter bone density at different skeletal sites. C1 TUFTS UNIV,USDA,HUMAN NUTR RES CTR AGING,DEPT BIOSTAT,BOSTON,MA 02111. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RP NELSON, ME (reprint author), TUFTS UNIV,USDA,HUMAN NUTR RES CTR AGING,HUMAN PHYSIOL LAB,711 WASHINGTON ST,BOSTON,MA 02111, USA. NR 46 TC 163 Z9 164 U1 0 U2 1 PU AMER SOC CLIN NUTRITION INC PI BETHESDA PA 9650 ROCKVILLE PIKE SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD MAY PY 1991 VL 53 IS 5 BP 1304 EP 1311 PG 8 WC Nutrition & Dietetics SC Nutrition & Dietetics GA FJ408 UT WOS:A1991FJ40800034 PM 2021138 ER PT J AU VOLKOW, ND FOWLER, JS WOLF, AP HITZEMANN, R DEWEY, S BENDRIEM, B ALPERT, R HOFF, A AF VOLKOW, ND FOWLER, JS WOLF, AP HITZEMANN, R DEWEY, S BENDRIEM, B ALPERT, R HOFF, A TI CHANGES IN BRAIN GLUCOSE-METABOLISM IN COCAINE DEPENDENCE AND WITHDRAWAL SO AMERICAN JOURNAL OF PSYCHIATRY LA English DT Article ID POSITRON EMISSION TOMOGRAPHY; OBSESSIVE-COMPULSIVE DISORDER; CAUDATE-PUTAMEN; BINDING-SITES; RAT; INVIVO; HUMANS; DRUGS AB Objective: The authors investigated changes in brain function associated with cocaine dependence and withdrawal to provide clues regarding the processes that lead to the uncontrollable self-administration of cocaine. Method: They measured regional brain metabolism with [F-18]-fluorodeoxyglucose (FDG) and positron emission tomography in 15 outpatients with the diagnosis of cocaine abuse and 17 normal comparison subjects. Ten of the patients were studied less than 1 week after they had last had cocaine, and five were studied 2-4 weeks after withdrawal. Results: Patients studied within 1 week of cocaine withdrawal but not those studied within 2-4 weeks of cocaine withdrawal had higher levels of global brain metabolism as well as higher levels of regional brain metabolism in the basal ganglia and orbitofrontal cortex than did normal subjects, probably as a consequence of less brain dopamine activity. There was also a significant relationship between the number of days since cocaine withdrawal and regional brain glucose metabolism in the orbitofrontal cortex and in the basal ganglia, and the correlations between cocaine craving and metabolic activity were significant in the prefrontal cortex and the orbitofrontal cortex. Conclusions: Although the time-dependent fall in metabolic activity suggests that the higher metabolic activity observed less than a week after cocaine withdrawal may represent a nonspecific expression of drug withdrawal, the selectivity of changes in glucose metabolism for the basal ganglia and for the orbitofrontal cortex suggests that the regional metabolic changes seen in cocaine abusers during detoxification are related to changes in brain dopamine activity. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. RP VOLKOW, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. FU NIDA NIH HHS [DA-06278] NR 33 TC 301 Z9 305 U1 7 U2 10 PU AMER PSYCHIATRIC ASSOCIATION PI WASHINGTON PA 1400 K ST NW, WASHINGTON, DC 20005 SN 0002-953X J9 AM J PSYCHIAT JI Am. J. Psychiat. PD MAY PY 1991 VL 148 IS 5 BP 621 EP 626 PG 6 WC Psychiatry SC Psychiatry GA FJ317 UT WOS:A1991FJ31700010 PM 2018164 ER PT J AU ELFALLAH, MZ GUIOCHON, G AF ELFALLAH, MZ GUIOCHON, G TI COMPARISON OF EXPERIMENTAL AND CALCULATED RESULTS IN OVERLOADED GRADIENT ELUTION CHROMATOGRAPHY FOR A SINGLE-COMPONENT BAND SO ANALYTICAL CHEMISTRY LA English DT Article ID PERFORMANCE LIQUID-CHROMATOGRAPHY; IDEAL MODEL; PREPARATIVE SEPARATION; SYNTHETIC PEPTIDES; LANGMUIR ISOTHERM; PROTEIN SAMPLES; MOBILE PHASE; PROFILES; PURIFICATION; PROPAGATION AB The elution profiles of high-concentration bands of pure compounds in gradient elution chromatography are investigated. Emphasis is placed on the influences of the amount of sample injected and of the gradient program. At moderate gradient rates, the band profiles recorded for 2-phenylethanol agree very well with those predicted by numerical integration of the mass balance equation, following a procedure widely used in isocratic chromatography which is now conventional. For steep gradients, the agreement is still good but differences appear, probably related to the higher importance of the equilibrium isotherm data at high solute concentrations. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 53 TC 33 Z9 33 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 1 PY 1991 VL 63 IS 9 BP 859 EP 867 DI 10.1021/ac00009a004 PG 9 WC Chemistry, Analytical SC Chemistry GA FJ318 UT WOS:A1991FJ31800006 ER PT J AU VOLPE, AM OLIVARES, JA MURRELL, MT AF VOLPE, AM OLIVARES, JA MURRELL, MT TI DETERMINATION OF RADIUM ISOTOPE RATIOS AND ABUNDANCES IN GEOLOGIC SAMPLES BY THERMAL IONIZATION MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article AB We describe chemical separation and mass spectrometric procedures for the measurement of radium isotopes in geologic samples. These methods provide Ra-226/Ra-228 ratio measurements for 1 g or less of rock sample containing subpicogram amounts of radium with precision better than 1.5% (95% confidence level). Radium-226 concentrations were measured by isotope dilution for smaller sample sizes (100-500 mg) containing as little as 1-10 fg of total Ra-226 with similar high precision. RP VOLPE, AM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE GEOCHEM,J-514,LOS ALAMOS,NM 87545, USA. NR 8 TC 80 Z9 80 U1 5 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 1 PY 1991 VL 63 IS 9 BP 913 EP 916 DI 10.1021/ac00009a015 PG 4 WC Chemistry, Analytical SC Chemistry GA FJ318 UT WOS:A1991FJ31800017 PM 1858983 ER PT J AU SESSLER, DI MCGUIRE, J SESSLER, AM AF SESSLER, DI MCGUIRE, J SESSLER, AM TI PERIOPERATIVE THERMAL INSULATION SO ANESTHESIOLOGY LA English DT Article DE MEASUREMENT TECHNIQUES, HEAT, THERMAL FLUX TRANSDUCERS; TEMPERATURE, HYPOTHERMIA, POSTOPERATIVE; THERMOREGULATION ID ANESTHESIA; TEMPERATURE AB To determine the efficacy of passive insulators advocated for prevention of cutaneous heat loss, we determined heat loss in unanesthetized volunteers covered by one of the following: a cloth "split sheet" surgical drape; a Convertors(R) disposable-paper split sheet; a Thermadrape(TM) disposable laparotomy sheet; an unheated Bair Hugger(R) patient-warming blanket; 1.5-mil-thick plastic hamper bags; and a prewarmed, cotton hospital blanket. Cutaneous heat loss was measured using 10 area-weighted thermal flux transducers while volunteers were exposed to a 20.6-degrees-C environment for 1 h. Heat loss decreased significantly from 100 +/- 3 W during the control periods to 69 +/- 6 W (average of all covers) after 1 h of treatment. Heat losses from volunteers insulated by the Thermadrape(TM) (61 +/- 6 W) and Bair Hugger(R) covers (64 +/- 5 W) were significantly less than losses from those insulated by plastic bags (77 +/- 11 W). The paper drape (67 +/- 7 W) provided slightly, but not significantly, better insulation than the cloth drape (70 +/- 4 W). Coverage by prewarmed cotton blankets initially resulted in the least heat loss (58 +/- 8 W), but after 40 min, resulted in heat loss significantly greater than that for the Thermadrape(TM) (71 +/- 7 W). Regional heat loss was roughly proportional to surface area, and the distribution of regional heat loss remained similar with all covers. These data suggest that cost and convenience should be major factors when choosing among passive perioperative insulating covers. It is likely that the amount of skin surface covered is more important than the choice of skin region covered or the choice of insulating material. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SESSLER, DI (reprint author), UNIV CALIF SAN FRANCISCO,DEPT ANESTHESIA,ROOM C-450,SAN FRANCISCO,CA 94143, USA. FU NIGMS NIH HHS [R29 GM 39723] NR 22 TC 74 Z9 76 U1 0 U2 3 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD MAY PY 1991 VL 74 IS 5 BP 875 EP 879 DI 10.1097/00000542-199105000-00012 PG 5 WC Anesthesiology SC Anesthesiology GA FJ905 UT WOS:A1991FJ90500012 PM 2021204 ER PT J AU MORE, RM WARREN, KH AF MORE, RM WARREN, KH TI SEMICLASSICAL CALCULATION OF MATRIX-ELEMENTS SO ANNALS OF PHYSICS LA English DT Article ID OSCILLATOR-STRENGTHS; WAVE-PACKETS; STATES; ORBITS; DIPOLE; PLASMA RP MORE, RM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 41 TC 22 Z9 22 U1 2 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD MAY 1 PY 1991 VL 207 IS 2 BP 282 EP 342 DI 10.1016/0003-4916(91)90060-L PG 61 WC Physics, Multidisciplinary SC Physics GA FL056 UT WOS:A1991FL05600002 ER PT J AU LADELFE, PC AF LADELFE, PC TI INADEQUATE HEATING OF FUSED-SILICA COMPONENTS DURING THE COATING PROCESS SO APPLIED OPTICS LA English DT Note RP LADELFE, PC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 2 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 MAY 1 PY 1991 VL 30 IS 13 BP 1578 EP 1579 PG 2 WC Optics SC Optics GA FL911 UT WOS:A1991FL91100001 PM 20700320 ER PT J AU HOWELLS, MR JACOBSEN, C AF HOWELLS, MR JACOBSEN, C TI POSSIBILITIES FOR PROJECTION X-RAY-LITHOGRAPHY USING HOLOGRAPHIC OPTICAL-ELEMENTS SO APPLIED OPTICS LA English DT Note C1 SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. RP HOWELLS, MR (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Jacobsen, Chris/E-2827-2015 OI Jacobsen, Chris/0000-0001-8562-0353 NR 12 TC 8 Z9 8 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 1 PY 1991 VL 30 IS 13 BP 1580 EP 1582 PG 3 WC Optics SC Optics GA FL911 UT WOS:A1991FL91100002 PM 20700321 ER PT J AU FORMAN, PR JAHODA, FC MASON, BL AF FORMAN, PR JAHODA, FC MASON, BL TI MULTIMODE FIBER INTERFEROMETRY WITH AND WITHOUT PHASE CONJUGATION SO APPLIED OPTICS LA English DT Article AB It is generally assumed that fiber interferometers must be constructed from single-mode fibers. An alternative is to employ phase conjugation mirrors on the arms of a multimode fiber interferometer so that the spatial scrambling of modes is reversed, and good fringe contrast is maintained. When several interferometers all share the same self-conjugating BaTiO3 crystal, however, the results show crosstalk between the separate fibers ranging from negligible to prohibitively large depending on on the precise spatial configuration within the conjugator. A model accounting for these results is proposed. In addition it was observed in control experiments with conventional Mach-Zehnder configurations that good data could be obtained despite reduced contrast with both graded and step index multimode fibers. RP FORMAN, PR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 6 TC 3 Z9 3 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 1 PY 1991 VL 30 IS 13 BP 1629 EP 1632 PG 4 WC Optics SC Optics GA FL911 UT WOS:A1991FL91100015 PM 20700334 ER PT J AU KUHLER, K DERENIAK, EL BUCHANAN, M AF KUHLER, K DERENIAK, EL BUCHANAN, M TI MEASUREMENT OF THE INDEX OF REFRACTION OF THE PLASTIC PHENOXY PKFE SO APPLIED OPTICS LA English DT Article AB The index of refraction, n of Phenoxy PKFE, a light yellow plastic produced by Union Carbide, is measured at lambda = 588 nm (n(D)), lambda = 656 nm (n(C)), and lambda = 486 nm (n(F)). These values are of interest because they must be known to determine the optical characteristics of a Phenoxy PKFE lens over the visible spectrum. Lenses made of Phenoxy PKFE have an important advantage over lenses made of other plastics. Phenoxy PKFE is chemically resistant to many epoxy glues commonly used to form airtight bonds in hermetically sealed chambers. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KUHLER, K (reprint author), UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721, USA. NR 2 TC 15 Z9 15 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 MAY 1 PY 1991 VL 30 IS 13 BP 1711 EP 1714 PG 4 WC Optics SC Optics GA FL911 UT WOS:A1991FL91100028 PM 20700347 ER PT J AU SANTONI, A TERMINELLO, LJ HIMPSEL, FJ TAKAHASHI, T AF SANTONI, A TERMINELLO, LJ HIMPSEL, FJ TAKAHASHI, T TI MAPPING THE FERMI-SURFACE OF GRAPHITE WITH A DISPLAY-TYPE PHOTOELECTRON SPECTROMETER SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID RESOLVED INVERSE PHOTOEMISSION; SECONDARY-ELECTRON EMISSION; TARGET-CURRENT SPECTROSCOPY; CONDUCTION-BAND STRUCTURE; SINGLE-CRYSTAL GRAPHITE; ENERGY; STATES AB A display spectrometer is used to image the momentum distribution of photoelectrons from the Fermi level in graphite. The Fermi "surface" consists of six points at the corners K of the hexagonal, two-dimensional Brillouin zone, in agreement with band theory. The method is also applied to other equal energy surfaces below the Fermi level, thereby giving the band dispersion of the pi-bands. C1 SINCROTRONE TRIESTE,TIB,ENEA,I-34012 TRIESTE,ITALY. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SANTONI, A (reprint author), IBM CORP,DIV RES,THOMAS J WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. RI Tohoku, Arpes/A-4890-2010; Takahashi, Takashi/E-5080-2010 NR 25 TC 45 Z9 46 U1 0 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD MAY PY 1991 VL 52 IS 5 BP 299 EP 301 DI 10.1007/BF00324768 PG 3 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA FM364 UT WOS:A1991FM36400004 ER PT J AU CHEN, X MAZUMDER, J PUROHIT, A AF CHEN, X MAZUMDER, J PUROHIT, A TI OPTICAL-EMISSION DIAGNOSTICS OF LASER-INDUCED PLASMA FOR DIAMOND-LIKE FILM DEPOSITION SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID CARBON-FILMS; INDUCED FLUORESCENCE; CLUSTER SOURCE; BAND SYSTEMS; ABLATION; VAPORIZATION; GRAPHITE; RADIATION; POLYMERS; C-2 AB Optical emission from a laser-induced plasma plume is recorded during KrF excimer laser ablation of graphite in a gas mixture of Ar and H2 (3 %) for deposition of diamond-like thin films. At sub-GW/cm2 laser intensities the spectrum is dominated by the bands of C2 and CN. From the band intensities, the vibrational temperatures of both radicals are calculated to be 12-15 x 10(3) K, and their concentrations are estimated to be 5 x 10(14) cm-3 and 2 x 10(14) cm-3, respectively. C1 ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439. RP CHEN, X (reprint author), UNIV ILLINOIS,DEPT MECH & IND ENGN,LASER AIDED MAT PROC LAB,URBANA,IL 61801, USA. NR 42 TC 53 Z9 53 U1 2 U2 12 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD MAY PY 1991 VL 52 IS 5 BP 328 EP 334 DI 10.1007/BF00324774 PG 7 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA FM364 UT WOS:A1991FM36400010 ER PT J AU SCHNEIDER, JF SCHNEIDER, KR SPIRO, SE BIERMA, DR SYTSMA, LF AF SCHNEIDER, JF SCHNEIDER, KR SPIRO, SE BIERMA, DR SYTSMA, LF TI EVALUATION OF GAS-CHROMATOGRAPHY MATRIX ISOLATION-INFRARED SPECTROSCOPY FOR THE QUANTITATIVE-ANALYSIS OF ENVIRONMENTAL-SAMPLES SO APPLIED SPECTROSCOPY LA English DT Article DE INFRARED; INSTRUMENTATION; GC/MI-IR; ANALYTICAL METHODS ID ORGANIC-COMPOUNDS; SPECTROMETRY; SPECTRA; IDENTIFICATION; PERFORMANCE; FTIR; OIL AB Gas chromatography/matrix isolation-infrared spectrometry (GC/MI-IR) is being applied to many analyses previously done only by gas chromatography/mass spectrometry (GC/MS). Qualitatively, the infrared spectra of matrix-isolated compounds contain much information about their structure. The information obtained from the infrared spectrum is complementary to the information obtained from mass spectrometry. The technique of GC/MI-IR should also be useful as a quantitative detector. In this study, semivolatile priority pollutant mixtures were analyzed quantitatively by GC/MI-IR. Results were compared with results obtained by GC/MS. Calibration curves were obtained on the GC/MI-IR for several semivolatile priority pollutants to measure the precision and linearity of this technique. The results indicated that GC/MI-IR, in its current form, is only suitable for semiquantitative work. RP SCHNEIDER, JF (reprint author), ARGONNE NATL LAB,ANALYT CHEM LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 28 TC 8 Z9 8 U1 0 U2 2 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD MAY PY 1991 VL 45 IS 4 BP 566 EP 571 DI 10.1366/0003702914336741 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA FN413 UT WOS:A1991FN41300010 ER PT J AU CHANG, HLM YOU, H GUO, J LAM, DJ AF CHANG, HLM YOU, H GUO, J LAM, DJ TI EPITAXIAL TIO2 AND VO2 FILMS PREPARED BY MOCVD SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SOLID FILMS AND SURFACES CY AUG 13-17, 1990 CL BROWN UNIV, PROVIDENCE, RI SP RHODE ISLAND CTR THIN FILM & INTERFACE RES & IND PARTNERSHIP, STATE RHODE ISLAND, DEPT ECON DEV, TECHNOL COUNCIL RHODE ISLAND HO BROWN UNIV ID GROWTH AB Titanium and vanadium oxide systems were selected to study the growth of thin epitaxial film in a metal-organic chemical vapor deposition (MOCVD) process. Epitaxial TiO2 and VO2 films were obtained on sapphire (1120BAR), (0001), and (1102BAR) but not on Si(111). Eight distinct substrate-film epitaxial relationships have been determined by X-ray diffraction studies using a four-circle diffractometer. It was found that none of the eight epitaxial systems had a good lattice match between substrate and film. But further investigation revealed that substantial similarity existed in the local atomic patterns of the substrate and the film for all these systems. Nevertheless, it should be emphasized that mismatches of the local atomic patterns for these systems are, in general, substantially larger than those observed in the epitaxial systems containing semiconductor materials such as silicon and GaAs. RP CHANG, HLM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 11 TC 55 Z9 56 U1 3 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1991 VL 48-9 BP 12 EP 18 DI 10.1016/0169-4332(91)90301-Y PG 7 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA FT442 UT WOS:A1991FT44200003 ER PT J AU FU, SS SOMORJAI, GA AF FU, SS SOMORJAI, GA TI ZINC-OXIDE AND OXYGEN OVERLAYERS ON CU(110) - A MODEL FOR CU-ZN-O CATALYSTS SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SOLID FILMS AND SURFACES CY AUG 13-17, 1990 CL BROWN UNIV, PROVIDENCE, RI SP RHODE ISLAND CTR THIN FILM & INTERFACE RES & IND PARTNERSHIP, STATE RHODE ISLAND, DEPT ECON DEV, TECHNOL COUNCIL RHODE ISLAND HO BROWN UNIV ID SUPPORTED COPPER-CATALYSTS; SINGLE-CRYSTAL SURFACES; ORIENTED THIN-FILMS; METHANOL DECOMPOSITION; 0001 SURFACES; FORMIC-ACID; NON-POLAR; CO; FORMALDEHYDE; ADSORPTION AB Submonolayers to multilayers of zinc and oxygen deposited in UHV on Cu(110) were characterized by Auger electron spectroscopy (AES), low-energy electron diffraction (LEED), and temperature-programmed desorption (TPD) of CO, CO2, and zinc. It is shown that initially, ZnO(x) grows two-dimensionally on Cu(110), but heating above 300 K leads irreversibly to three-dimensional island formation. These three-dimensional ZnO(x) islands were then used with various amounts of chemisorbed oxygen on the exposed Cu(110) as models for Cu-Zn-O methanol synthesis catalysts. Methanol produces formates on the surface, the concentration of which can be controlled by the amount of chemisorbed oxygen. The oxygen coverage found on Cu-Zn-O methanol synthesis catalysts after reaction corresponds to the oxygen coverage at which maximum formate formation occurs on our ZnO(x)/O/Cu(110) surfaces. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP FU, SS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT & CHEM SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 24 TC 17 Z9 17 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1991 VL 48-9 BP 93 EP 103 DI 10.1016/0169-4332(91)90312-8 PG 11 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA FT442 UT WOS:A1991FT44200014 ER PT J AU SHEK, ML SHAM, TK HRBEK, J XU, GQ AF SHEK, ML SHAM, TK HRBEK, J XU, GQ TI A SOFT-X-RAY STUDY OF A LI-S SURFACE COMPOUND SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SOLID FILMS AND SURFACES CY AUG 13-17, 1990 CL BROWN UNIV, PROVIDENCE, RI SP RHODE ISLAND CTR THIN FILM & INTERFACE RES & IND PARTNERSHIP, STATE RHODE ISLAND, DEPT ECON DEV, TECHNOL COUNCIL RHODE ISLAND HO BROWN UNIV ID AUGER; PHOTOELECTRON AB We have studied a "Li2S(x)" compound (x almost-equal-to 0.79 to 0.95) with soft X-ray excited valence and core-level photoemission and Auger electron emission. The Li 1s core level is found at a binding energy of 56.9 eV, shifted by approximately 1.9 eV relative to the bulk 1s level of Li metal. The Li KVV Auger transition gives two peaks at kinetic energies 44.9 and 41.2 eV with respect to the Fermi level, corresponding to final states with two valence holes on different sites or on the same site, respectively. The S 2p photoemission doublets are observed at 162.7 and approximately 163.7 eV, their de-excitation giving rise to the SL2,3VV Auger peak at 149.2 eV. We discuss the electronic interactions in the Li2S(x) surface compound, and make a comparison with those in a Li-O surface compound. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. UNIV WESTERN ONTARIO,DEPT CHEM,LONDON NA6 5B7,ONTARIO,CANADA. RI Xu, Guo Qin/C-2077-2013; Hrbek, Jan/I-1020-2013 NR 14 TC 5 Z9 5 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1991 VL 48-9 BP 332 EP 336 DI 10.1016/0169-4332(91)90353-L PG 5 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA FT442 UT WOS:A1991FT44200055 ER PT J AU ZUO, JK WENDELKEN, JF AF ZUO, JK WENDELKEN, JF TI SUBSTRATE-TEMPERATURE EFFECTS ON (3-SQUARE-ROOT X 3-SQUARE-ROOT)R30-DEGREES DOMAIN GROWTH OF AG ON SI(111) SURFACE SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SOLID FILMS AND SURFACES CY AUG 13-17, 1990 CL BROWN UNIV, PROVIDENCE, RI SP RHODE ISLAND CTR THIN FILM & INTERFACE RES & IND PARTNERSHIP, STATE RHODE ISLAND, DEPT ECON DEV, TECHNOL COUNCIL RHODE ISLAND HO BROWN UNIV ID DIFFRACTION; LEED; AES; OVERLAYER; GEOMETRY; ENERGY AB High-resolution LEED angular profiles associated with (square-root 3 x square-root 3)R30-degrees domain growth of Ag on Si(111) have been analyzed following Ag deposition as a function of substrate temperature. We found that the square-root 3 domain size distribution has the same Gamma distribution at different coverages and substrate temperatures. However, at higher substrate temperatures the square-root 3 structure grows with coverage primarily by domain coalescence as indicated by the considerable increase in the mean and width of the size distribution. As a result, scaling, i.e. self-similar domain growth, is observed. At lower substrate temperatures the square-root 3 structure grows with coverage by simply increasing the number of small, randomly nucleated domains. Hence, the domain size distribution at low temperatures is narrow and varies little with coverage. RP ZUO, JK (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 27 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1991 VL 48-9 BP 366 EP 372 DI 10.1016/0169-4332(91)90359-R PG 7 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA FT442 UT WOS:A1991FT44200061 ER PT J AU NELSON, AJ GEBHARD, S KAZMERSKI, LL ROCKETT, A COLAVITA, E ENGELHARDT, M HOCHST, H AF NELSON, AJ GEBHARD, S KAZMERSKI, LL ROCKETT, A COLAVITA, E ENGELHARDT, M HOCHST, H TI SOFT-X-RAY PHOTOEMISSION INVESTIGATION OF THE CDS/CUINSE2 HETEROJUNCTION INTERFACE SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SOLID FILMS AND SURFACES CY AUG 13-17, 1990 CL BROWN UNIV, PROVIDENCE, RI SP RHODE ISLAND CTR THIN FILM & INTERFACE RES & IND PARTNERSHIP, STATE RHODE ISLAND, DEPT ECON DEV, TECHNOL COUNCIL RHODE ISLAND HO BROWN UNIV ID SOLAR-CELLS; CUINSE2; CUGASE2; GROWTH AB Synchrotron radiation soft X-ray photoemission spectroscopy was used to investigate the development of the electronic structure at the CdS/CuInSe2 heterojunction interface. CdS overlayers were deposited sequentially in steps on single-crystal p- and n-type CuInSe2 at 250-degrees-C. Results indicate that the CdS grows in registry with the substrate, initially in a two-dimensional growth mode followed by three-dimensional island growth as is corroborated by RHEED analysis. Photoemission measurements were acquired after each growth in order to observe changes in the valence band electronic structure as well as changes in the In 4d, Se 3d, Cd 4d and S2p core lines. The results were used to correlate the interface chemistry with the electronic structure at these interfaces and to directly determine the CdS/CuInSe2 heterojunction valence band discontinuity and the consequent heterojunction band diagram. C1 UNIV ILLINOIS,DEPT MAT SCI,URBANA,IL 61801. UNIV CALABRIA,DEPT PHYS,I-87036 RENDE,ITALY. UNIV WISCONSIN MADISON,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. RP NELSON, AJ (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. RI Rockett, Angus/A-3218-2008; Rockett, Angus/B-5539-2013 OI Rockett, Angus/0000-0001-9759-8421 NR 24 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1991 VL 48-9 BP 419 EP 424 DI 10.1016/0169-4332(91)90367-S PG 6 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA FT442 UT WOS:A1991FT44200069 ER PT J AU LEE, TC QIAN, CG SNYDER, F AF LEE, TC QIAN, CG SNYDER, F TI BIOSYNTHESIS OF CHOLINE PLASMALOGENS IN NEONATAL RAT MYOCYTES SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID PLATELET-ACTIVATING FACTOR; LYSOPHOSPHOLIPASE-D; ZELLWEGER SYNDROME; ETHER LIPIDS; PHOSPHOLIPIDS; METABOLISM; TISSUES; PEROXISOMES; DEFICIENCY; BRAIN RP LEE, TC (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,POB 117,OAK RIDGE,TN 37831, USA. FU NCI NIH HHS [CA-41642-05] NR 37 TC 16 Z9 17 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD MAY 1 PY 1991 VL 286 IS 2 BP 498 EP 503 DI 10.1016/0003-9861(91)90071-P PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FF777 UT WOS:A1991FF77700027 PM 1897971 ER PT J AU ANDERSON, R HASSANI, V KIRKPATRICK, A KNAPPMILLER, K HITTLE, D AF ANDERSON, R HASSANI, V KIRKPATRICK, A KNAPPMILLER, K HITTLE, D TI VISUALIZING THE AIR-FLOW FROM COLD AIR CEILING JETS SO ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS LA English DT Article RP ANDERSON, R (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER SOC HEAT REFRIG AIR- CONDITIONING ENG INC PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 SN 0001-2491 J9 ASHRAE J JI ASHRAE J.-Am. Soc. Heat Refrig. Air-Cond. Eng. PD MAY PY 1991 VL 33 IS 5 BP 30 EP & PG 0 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA FL987 UT WOS:A1991FL98700010 ER PT J AU BRODRICK, JR LEWIS, JE AF BRODRICK, JR LEWIS, JE TI PLANNING FOR THE COMMERCIAL REPLACEMENT MARKET IN THE 1990S SO ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS LA English DT Article RP BRODRICK, JR (reprint author), PACIFIC NW LAB, CTR TECHNOL PLANNING & ANAL, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC HEAT REFRIG AIR- CONDITIONING ENG INC PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 SN 0001-2491 J9 ASHRAE J JI ASHRAE J.-Am. Soc. Heat Refrig. Air-Cond. Eng. PD MAY PY 1991 VL 33 IS 5 BP 42 EP + PG 0 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA FL987 UT WOS:A1991FL98700012 ER PT J AU SCHECHTER, PL AARONSON, M BLANCO, VM COOK, KH AF SCHECHTER, PL AARONSON, M BLANCO, VM COOK, KH TI CARBON STAR REDDENINGS AND LOW LATITUDE H-1 COLUMN DENSITIES SO ASTRONOMICAL JOURNAL LA English DT Article ID SOUTHERN MILKY-WAY; MAGELLANIC CLOUDS; LUMINOSITIES AB Foreground H I column densities are computed toward 564 low latitude northern and southern hemisphere carbon stars, using photometric distances and an assumed rotation curve. Separate dust-to-H I ratios and dereddened (J - H,H - K) loci are obtained for the two hemispheres. A small but statistically significant difference is found between the two samples, which is attributed to a small difference in photometric systems. C1 UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. CERRO TOLOLO INTERAMER OBSERV,LA SERENA,CHILE. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,LIVERMORE,CA 94550. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. RP SCHECHTER, PL (reprint author), CARNEGIE INST WASHINGTON,OBSERV,813 SANTA BARBARA ST,PASADENA,CA 91101, USA. NR 16 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD MAY PY 1991 VL 101 IS 5 BP 1756 EP 1762 DI 10.1086/115803 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FH746 UT WOS:A1991FH74600016 ER PT J AU KAWANO, LH FOWLER, WA KAVANAGH, RW MALANEY, RA AF KAWANO, LH FOWLER, WA KAVANAGH, RW MALANEY, RA TI SIGNATURES OF INHOMOGENEITY IN THE EARLY UNIVERSE SO ASTROPHYSICAL JOURNAL LA English DT Article DE ABUNDANCES; EARLY UNIVERSE; NUCLEOSYNTHESIS ID HADRON PHASE-TRANSITION; NEUTRON DIFFUSION; NUCLEOSYNTHESIS AB We have made a systematic study of the production of elemental CNO in inhomogeneous nucleosynthesis, investigating a much larger region of parameter space than previously studied. We have determined abundances of CNO elements and ascertained the main channels to their production. We have focused in particular on the role played by the Li-7(n, gamma)Li-8(alpha, n)B-11(n, gamma)B-12(beta--nu)C-12 reaction sequence: in models with OMEGA-b = 1, we show that this sequence provides the main channel to CNO element production of which there is a significant amount; for lower values of OMEGA-b there is competition from Li-7(alpha, gamma)B-11, but here there is a concurrent decline in CNO production. From these determinations, CNO element production emerges as a distinct signature of an OMEGA-b = 1 inhomogeneous universe. Beyond C-12, a series of neutron captures is thought to lead to the production of C-14. We have studied the branching at C-14 and have deduced the importance of the C-14(d, n)N-15 reaction which may be the dominant channel for the production of heavier elements. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP KAWANO, LH (reprint author), CALTECH,KELLOGG RADIAT LAB,106-38,PASADENA,CA 91125, USA. RI Malaney, Robert/F-6588-2012 OI Malaney, Robert/0000-0001-9672-5601 NR 25 TC 46 Z9 47 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 1 PY 1991 VL 372 IS 1 BP 1 EP 7 DI 10.1086/169948 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FH367 UT WOS:A1991FH36700001 ER PT J AU VANRIPER, KA AF VANRIPER, KA TI STEADY-STATE ENERGY-SOURCES IN NEUTRON-STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DENSE MATTER; STARS, EVOLUTION; STARS, INTERIORS; STARS, NEUTRON; STARS, X-RAYS ID MATTER; MODELS; CRUST AB The thermal response of 1.4 M. neutron stars to steady state internal energy sources is studied. A thermal evolution model, which calculates the interior temperature distribution, is used. The potentially observable surface luminosity is lower than the source rate because of volume neutrino emission, nonisothermal temperature profiles, and redshift factors. Heating rates between 10(30) and 10(41) ergs s-1 are applied as either a central point source or an inner crust source. The latter models the heat generated as superfluid vortex lines break free from pinning nuclei. The latter case gives heat generation in the stellar layers between 10(12) and 10(14) g cm-3, peaking between 1.5 and 6 x 10(13) g cm-3. Results are given for a surface field B = 10(13) G and for B = 0. The effects of a central accelerated cooling mechanism, represented by a free-quark phase, are shown. These results from the thermal evolution model are compared with isothermal models to establish the range of validity of the latter. RP VANRIPER, KA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,RADIAT TRANSPORT GRP,POB 1663,LOS ALAMOS,NM 87545, USA. NR 18 TC 22 Z9 22 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 1 PY 1991 VL 372 IS 1 BP 251 EP 258 DI 10.1086/169970 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FH367 UT WOS:A1991FH36700023 ER PT J AU LATTANZIO, JC AF LATTANZIO, JC TI STELLAR EVOLUTIONARY MODELS FROM THE ZERO-AGE MAIN-SEQUENCE TO THE 1ST THERMAL PULSE SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE STARS, EVOLUTION; STARS, INTERIORS ID ASYMPTOTIC GIANT BRANCH; INTERMEDIATE-MASS STARS; DREDGE-UP AB We present detailed numerical tabulations of 32 stellar evolutionary sequences extending from either the zero-age main sequence (ZAMS) or the zero-age horizontal branch (ZAHB), and through to the occurrence of thermal pulses on the asymptotic giant branch. The models span a range of 1-3 M. (except for one 4 M. and one 5 M. model) and cover metallicities of Z = 0.02, 0.01, 0.006, 0.003, and 0.001, each with Y = 0.20 and 0.30. These models can be used for various stellar population studies, and as a comparison between rival calculations with different input physics. RP LATTANZIO, JC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,L-413,POB 808,LIVERMORE,CA 94550, USA. NR 32 TC 65 Z9 65 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD MAY PY 1991 VL 76 IS 1 BP 215 EP 357 DI 10.1086/191569 PG 143 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FH135 UT WOS:A1991FH13500007 ER PT J AU HADLEY, SW WILBUR, DS GRAY, MA ATCHER, RW AF HADLEY, SW WILBUR, DS GRAY, MA ATCHER, RW TI ASTATINE-211 LABELING OF AN ANTIMELANOMA ANTIBODY AND ITS FAB FRAGMENT USING N-SUCCINIMIDYL PARA-ASTATOBENZOATE - COMPARISONS INVIVO WITH THE PARA-[125I]IODOBENZOYL CONJUGATE SO BIOCONJUGATE CHEMISTRY LA English DT Article ID MONOCLONAL-ANTIBODIES; PROTEINS; ASTATINATION; CHEMISTRY; STABILITY; CANCER; AT-211 AB Astatine-211 labeling of an antimelanoma antibody, NR-ML-05, and its Fab fragment with N-succinimidyl p-[At-211] astatobenzoate (2a) has been described. Preparation of the astatinated intermediate 2a was accomplished by distilling astatine-211 from an irradiated bismuth target directly into a reaction mixture containing an organometallic compound, N-succinimidyl p-(tri-n-butylstannyl)benzoate (1), and an oxidant, N-chlorosuccinimide, in 5% HOAc/MeOH. Trapping of distilled astatine as 2a was found to be efficient, resulting in 70-90% yields based on the amount of astatine-211 in the reaction mixture. The dry distillation technique employed gave recoveries of astatine-211 which ranged from 20% to 75%. Conjugation of 2a to NR-ML-05 and its Fab fragment was accomplished in 40-60% yields. The [At-211]astatobenzoyl-conjugated antibodies were found to be stable in vitro when challenged by strong denaturants and nucleophilic reagents. Coinjected dual-labeled studies of the 2a astatinated antibodies and the same antibodies labeled with N-succinimidyl p-[I-125]iodobenzoate (2b) in athymic mice bearing the human tumor xenograft A375 Met/Mix demonstrated that both radiolabeled antibodies had equivalent tumor localization. Data from the dual-labeled biodistribution of the intact antibody suggests that the astatine is stably attached. Data from the dual-labeled Fab fragment suggests that a portion of the astatine label is released as astatide, either from the astatinated Fab or from a catabolite. C1 UNIV WASHINGTON,MED CTR,DEPT RADIAT ONCOL,1959 NE PACIFIC ST,SEATTLE,WA 98195. NEORX CORP,SEATTLE,WA 98119. ARGONNE NATL LAB,ARGONNE,IL 60439. FU NCI NIH HHS [N43-CM-67939] NR 50 TC 52 Z9 53 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1043-1802 J9 BIOCONJUGATE CHEM JI Bioconjugate Chem. PD MAY-JUN PY 1991 VL 2 IS 3 BP 171 EP 179 DI 10.1021/bc00009a006 PG 9 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Multidisciplinary; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA GB085 UT WOS:A1991GB08500006 PM 1932216 ER PT J AU DELMORE, JE APPELHANS, AD AF DELMORE, JE APPELHANS, AD TI DETECTION OF AGRICULTURAL CHEMICAL RESIDUES ON PLANT LEAF SURFACES WITH SECONDARY ION MASS-SPECTROMETRY SO BIOLOGICAL MASS SPECTROMETRY LA English DT Article ID PESTICIDES AB The high sensitivity of secondary ion mass spectrometry (SIMS) for materials residing on a sample surface makes it well suited for detecting the presence of chemicals sprayed onto surfaces. To investigate the possibility that agricultural chemicals could be detected by direct analysis of a plant leaf surface, two common agricultural chemicals, 2,4-D and malathion, were sprayed onto separate plants at label-recommended concentrations (6.7 p.p.t. and 5.0 p.p.t., respectively) and individual plant leaves were analyzed using SIMS over a period of up to 9 weeks after spraying. The plants were located in a greenhouse and were not exposed to rain (or overhead watering) during the experiment. Characteristic negative fragment ions of the chemicals were used as marker peaks; the molecular ions were not obtained. The 2,4-D was easily detectable during the first few days after spraying but only marginally detectable thereafter. The malathion was easily detected up to 9 weeks after spraying. The minimum detectable limit for malathion on this particular plant leaf type was determined to be approximately 10 ng. The results indicate that SIMS may be a useful analysis technique when screening for residual chemicals on plant surfaces. RP DELMORE, JE (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 11 TC 14 Z9 14 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1052-9306 J9 BIOL MASS SPECTROM JI Biol. Mass Spectrom. PD MAY PY 1991 VL 20 IS 5 BP 237 EP 246 DI 10.1002/bms.1200200502 PG 10 WC Biophysics; Spectroscopy SC Biophysics; Spectroscopy GA FL336 UT WOS:A1991FL33600001 ER PT J AU QUESADA, MA RYE, HS GINGRICH, JC GLAZER, AN MATHIES, RA AF QUESADA, MA RYE, HS GINGRICH, JC GLAZER, AN MATHIES, RA TI HIGH-SENSITIVITY DNA DETECTION WITH A LASER-EXCITED CONFOCAL FLUORESCENCE GEL SCANNER SO BIOTECHNIQUES LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; MICROSCOPY AB A high-sensitivity, laser-excited confocal fluorescence gel scanner has been developed and applied to the detection of fluorescently labeled DNA. An argon ion laser (1-10 mW at 488 nm) is focused in the gel with a high-numerical aperture microscope objective. The laser-excited fluorescence is gathered by the objective and focused on a confocal spatial filter, followed by a spectral filter and photo-detector. The gel is placed on a computer-controlled scan stage, and the scanned image of the gel fluorescence is stored and analyzed in a computer. This scanner has been used to detect DNA separated on sequencing gels, agarose mapping gels and pulsed field gels. Sanger sequencing gels were run on M13mp18 DNA using a fluoresceinated primer. The 400-mu-m-thick gels, loaded with 30 fmol of DNA fragments in 3-mm lanes, were scanned at 78-mu-m resolution. The high resolution of our scanner coupled with image processing allows us to read up to approximately 300 bases in four adjacent sequencing lanes. The minimum band size that could be detected and read was approximately 200 mu-m. This instrument has a limiting detection sensitivity of approximately 10 amol of fluorescein-labeled DNA in a 1 x 3-mm band. In applications to agarose mapping gels, we have exploited the fact that DNA can be prestained with ethidium homodimer, followed by electrophoresis and fluorescence detection to achieve picogram sensitivity (8). We have also developed methods using both ethidium homodimer and thiazole orange staining which permit two-color detection of DNA in one lane. Finally, these methods have been used to perform high-sensitivity detection of DNA separated on pulsed field gels. This fluorescence gel scanner is advantageous because it has high detection sensitivity, the off-line detection apparatus is not tied to the electrophoresis system, and it immediately provides a quantitative image for data analysis and display. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM 07232] NR 30 TC 52 Z9 52 U1 0 U2 4 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD MAY PY 1991 VL 10 IS 5 BP 616 EP & PG 0 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FL887 UT WOS:A1991FL88700014 PM 1910779 ER PT J AU STANFORD, GS BOYAR, RE AF STANFORD, GS BOYAR, RE TI NUCLEAR-POLITICS - JASPER,JM SO BULLETIN OF THE ATOMIC SCIENTISTS LA English DT Book Review RP STANFORD, GS (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU EDUC FOUNDATION NUCLEAR SCI PI CHICAGO PA 6042 SOUTH KIMBARK, CHICAGO, IL 60637 SN 0096-3402 J9 B ATOM SCI JI Bull. Atom. Scient. PD MAY PY 1991 VL 47 IS 4 BP 45 EP 46 PG 2 WC International Relations; Social Issues SC International Relations; Social Issues GA FJ653 UT WOS:A1991FJ65300018 ER PT J AU TAYLOR, BE AHO, JM MAHONEY, DL ESTES, RA AF TAYLOR, BE AHO, JM MAHONEY, DL ESTES, RA TI POPULATION-DYNAMICS AND FOOD-HABITS OF BLUEGILL (LEPOMIS-MACROCHIRUS) IN A THERMALLY STRESSED RESERVOIR SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID NUCLEAR-REACTOR; BIOMASS; ZOOPLANKTON; RESOURCE AB Bluegil (Lepomis macrochirus) is the dominant fish species in a 67-ha cooling reservoir for a nuclear reactor on the Savannah River Site in South Carolina. Mortality and breeding season of bluegill were strongly influenced by reactor operations, which often produced temperatures of 40-60-degrees-C in portions of the reservoir. Late spring and summer reactor operations caused approximately 90% mortality of bluegill. This mortality was largely associated with reactor restarts. Survivors occupied small thermal refuges in coves. Elevated fall and winter temperatures allowed an extended breeding season, although extremely high summer temperatures appeared to inhibit breeding. Bluegill depended primarily on benthic food resources, including dipterans and microcrustaceans. Despite the great variation in environmental conditions and diets, body condition of surviving bluegill was nearly constant between April 1985 and January 1986. Factors that contribute to the success of bluegill in this system include high thermal tolerance, broad diets, and an ability to breed when thermal conditions are appropriate, regardless of season. RP TAYLOR, BE (reprint author), SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801, USA. NR 23 TC 7 Z9 7 U1 2 U2 7 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD MAY PY 1991 VL 48 IS 5 BP 768 EP 775 DI 10.1139/f91-092 PG 8 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA FP953 UT WOS:A1991FP95300005 ER PT J AU HOWARD, SL WANG, JM ROCKWOOD, AL AF HOWARD, SL WANG, JM ROCKWOOD, AL TI OBSERVATION OF TRANSLATIONAL-TO-VIBRATIONAL ENERGY-TRANSFER IN CHARGE-TRANSFER REACTIONS OF CO+ WITH CO USING CROSSED-BEAM TECHNIQUES SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID MOLECULAR-BEAM; ION; COLLISIONS; EXCHANGE; EXCITATION; RESONANCE; DYNAMICS AB The crossed-beam method was used to investigate the charge-transfer reaction of CO+ (X 2-SIGMA+, v = 0) with CO (X 1-SIGMA+, v = 0). Scattering of CO+ demonstrates that several vibrational states are populated. At a collisional energy of 1.1 eV, transfer of translational energy to vibrational energy is shown to occur by changes of an even number of vibrational quanta. C1 WUHAN INST PHYS, WUHAN, PEOPLES R CHINA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP HOWARD, SL (reprint author), USA, BALLIST RES LABS, SLCBR IB I, ABERDEEN PROVING GROUND, MD 21005 USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD MAY PY 1991 VL 69 IS 5 BP 581 EP 583 PG 3 WC Physics, Multidisciplinary SC Physics GA FV213 UT WOS:A1991FV21300007 ER PT J AU PANOZZO, J BERTONCINI, D MILLER, D LIBERTIN, CR WOLOSCHAK, GE AF PANOZZO, J BERTONCINI, D MILLER, D LIBERTIN, CR WOLOSCHAK, GE TI MODULATION OF EXPRESSION OF VIRUS-LIKE ELEMENTS FOLLOWING EXPOSURE OF MICE TO HIGH-LET AND LOW-LET RADIATIONS SO CARCINOGENESIS LA English DT Article ID PROTEIN KINASE-C; IONIZING-RADIATION; GENE-EXPRESSION; EMBRYO CELLS; MAMMALIAN-CELLS; X-IRRADIATION; VL30 GENES; INDUCTION; SEQUENCES; METALLOTHIONEIN AB Modulation of virus expression has been reported following exposure to a variety of cellular stresses, including UV radiation and heat-shock. The experiments reported here were designed to examine expression of endogenous VL30 (virus-like 30 S) elements following exposure of whole mice to ionizing radiations. Whole mice were exposed to doses of neutrons (50 cGy) or gamma-rays (300 cGy) shown to be equally efficient in cancer production in the whole animal, and tissues were harvested at 10 and 60 min following completion of the exposure. RNA extracted from these tissues and from tissues of untreated controls was examined for VL30 RNA accumulation by dilution dot blot and Northern blot analyses. These studies revealed that neutrons repressed VL30 RNA accumulation evident within 10 min following exposure in brain, gut, thymus and spleen but not in liver, in which VL30 RNA was unaffected by radiation exposure. During this same time interval, gamma-rays induced VL30 expression in gut and brain and to a lesser extent in liver. These experiments suggest the presence of a differential molecular response following whole-body exposure to high- versus low-LET radiations. In addition, this work demonstrates that ionizing radiations may affect expression of murine endogenous viral sequences. C1 LOYOLA UNIV,MED CTR,DEPT PATHOL,MAYWOOD,IL 60153. LOYOLA UNIV,MED CTR,DEPT MED,MAYWOOD,IL 60153. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 28 TC 19 Z9 19 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0143-3334 J9 CARCINOGENESIS JI Carcinogenesis PD MAY PY 1991 VL 12 IS 5 BP 801 EP 804 DI 10.1093/carcin/12.5.801 PG 4 WC Oncology SC Oncology GA FL733 UT WOS:A1991FL73300009 PM 2029743 ER PT J AU BARROWS, LR PAXTON, MB KENNEDY, KA THOMPSON, LH AF BARROWS, LR PAXTON, MB KENNEDY, KA THOMPSON, LH TI CHARACTERIZATION OF REVERTANTS OF THE CHO EM9 MUTANT ARISING DURING DNA TRANSFECTION SO CARCINOGENESIS LA English DT Article ID SISTER-CHROMATID EXCHANGE; STRAND-BREAK REPAIR; MEDIATED TRANSFER; MAMMALIAN-CELLS; HEAT-SHOCK; GENE; INDUCTION; SEQUENCES; O-6-METHYLGUANINE; EXPRESSION AB We have studied reversion in DNA repair deficient EM9 cells, by selection for ethylmethanesulfonate (EMS) resistance. EM9 is a mutant CHO cell line that is hypersensitive to killing by EMS and X-rays and deficient in DNA single-strand break (SSB) repair. EM9 cells were transfected with DNA from a cosmid library, and transfectants resistant to EMS were isolated. Four revertant lines were obtained, which varied in their sensitivity to killing by EMS, ionizing radiation and other genotoxic agents. When the cell lines were analyzed for resistance to killing by chlorodeoxyuridine (CldUrd) or N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), a different relative ranking among the cell lines was observed. The recently cloned human XRCC1 gene is capable of correcting the deficiencies of the EM9 cell line. Using the human XRCC1 cDNA (pXR1-30) as a probe, we determined that the resistant-transfectant cell lines contained only the endogenous hamster XRCC1 gene, implying that a hamster XRCC1 gene was altered during the transfection/selection procedure and was responsible for the EMS resistance. In these cells the levels of XRCC1 mRNA corresponded roughly to the degrees of resistance of the reverted cell lines to killing by EMS or X-rays. The degree of increased resistance to killing by EMS or X-rays also roughly correlated with increased SSB repair. These results suggest that increased cellular levels of the endogenous XRCC1 gene mRNA may largely, though not completely, explain the phenotypes of revertant, EMS-resistant EM9 cell lines. C1 UTAH REG CANC CTR,SALT LAKE CITY,UT 84112. GEORGE WASHINGTON UNIV,DEPT GENET,WASHINGTON,DC 20037. GEORGE WASHINGTON UNIV,DEPT PHARMACOL,WASHINGTON,DC 20037. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP BARROWS, LR (reprint author), UNIV UTAH,DEPT PHARMACOL & TOXICOL,113 SKAGGS HALL,SALT LAKE CITY,UT 84112, USA. FU NCI NIH HHS [R01-CA-36943, R01-CA-41561, P30-CA-42014] NR 27 TC 13 Z9 17 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0143-3334 J9 CARCINOGENESIS JI Carcinogenesis PD MAY PY 1991 VL 12 IS 5 BP 805 EP 811 DI 10.1093/carcin/12.5.805 PG 7 WC Oncology SC Oncology GA FL733 UT WOS:A1991FL73300010 PM 2029744 ER PT J AU SIGDESTAD, CP BERGQUIST, BL GRDINA, DJ AF SIGDESTAD, CP BERGQUIST, BL GRDINA, DJ TI THE EFFECT OF CHEMICAL RADIATION PROTECTORS ON CELL-CYCLE PROGRESSION AFTER GAMMA OR NEUTRON-IRRADIATION SO CELL PROLIFERATION LA English DT Article ID DNA; RADIOPROTECTION; WR-2721; DAMAGE; REPAIR AB The effects of two chemical radiation protectors, WR-1065 and WR-151326, were characterized in V79 Chinese hamster cells after either cobalt-60 (Co-60) gamma or fission spectrum neutron irradiation. Each protector was administered at a concentration of 4 mM to exponentially growing cultures for 30 min prior to and during irradiation with either Co-60 gamma or JANUS fission spectrum neutrons. After irradiation the cells were either plated immediately for survival or returned to the incubator and assayed for cell progression. Aliquots of cells were removed at selected times, counted, fixed and stained with 4'6-diamidino-2-phenylindole (DAPI). Analysis of DNA histograms indicate that the presence of the protector during irradiation reduced the division delay experienced at the G2-M interface. Implications of these effects are discussed. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. UNIV NO IOWA,DEPT BIOL,CEDAR FALLS,IA 50614. UNIV LOUISVILLE,J GRAHAM BROWN CANC CTR,DEPT RADIAT ONCOL,LOUISVILLE,KY 40292. FU NCI NIH HHS [CA-37435] NR 16 TC 19 Z9 19 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0960-7722 J9 CELL PROLIFERAT JI Cell Prolif. PD MAY PY 1991 VL 24 IS 3 BP 271 EP 280 DI 10.1111/j.1365-2184.1991.tb01156.x PG 10 WC Cell Biology SC Cell Biology GA FP829 UT WOS:A1991FP82900003 PM 2039803 ER PT J AU BLEY, U DAVIES, PB GRANTZ, M SEARS, TJ TEMPS, F AF BLEY, U DAVIES, PB GRANTZ, M SEARS, TJ TEMPS, F TI FIR LMR SPECTRA OF FO2 - SOME CLASSIC EXAMPLES OF LEVEL ANTICROSSING RESONANCES SO CHEMICAL PHYSICS LA English DT Article ID LASER MAGNETIC-RESONANCE; SPIN-ROTATION; MICROWAVE SPECTROSCOPY; HO2; SPECTROMETER; AVOIDANCE; RADICALS AB Far infrared LMR spectra of FO2 at wavelengths near 920-mu-m have been recorded and analysed. These spectra extend earlier FIR LMR work on the radical to longer wavelengths. Many of the FO2 spectra, including those around 920-mu-m show features that can only be explained by level anticrossing mechanisms. The rotational assignment of several anticrossing spectra was achieved using zero field parameters from a previous mm wave absorption study and g-factors estimated theoretically. The anticrossings involved in the present study derive from operators in the effective Hamiltonian that mix rotational levels with DELTA-N = 0, DELTA-J = 0, +/- 1 and DELTA-K(a) = +/- 1 where N, K(a) are the usual symmetric top quantum numbers and J = N + S. A combined fit of LMR, anticrossing, and millimetre wave spectral data is used to estimate values for some of the parameters describing these effects. Residual differences between the observed and calculated spectra are discussed in terms of possible additional contributions to the effective Zeeman Hamiltonian and further experimental tests to determine the importance of these small terms are suggested. C1 UNIV CAMBRIDGE,DEPT CHEM,CAMBRIDGE CB2 1EW,ENGLAND. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP BLEY, U (reprint author), MAX PLANCK INST STROMUNGSFORSCH,BUNSENSTR 10,W-3400 GOTTINGEN,GERMANY. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 27 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD MAY 1 PY 1991 VL 152 IS 3 BP 281 EP 292 DI 10.1016/0301-0104(91)85005-2 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FK694 UT WOS:A1991FK69400005 ER PT J AU JANKOWIAK, R SMALL, GJ AF JANKOWIAK, R SMALL, GJ TI FLUORESCENCE LINE NARROWING - A HIGH-RESOLUTION WINDOW ON DNA AND PROTEIN DAMAGE FROM CHEMICAL CARCINOGENS SO CHEMICAL RESEARCH IN TOXICOLOGY LA English DT Review ID PICOSECOND PHOTON-ECHO; ONE-ELECTRON OXIDATION; AROMATIC HYDROCARBON CARCINOGENESIS; HOLE-BURNING SPECTROSCOPY; OPTICAL-SPECTRA; CHLOROPHYLL-A; TEMPERATURE-DEPENDENCE; VIBRONIC SPECTRA; ETIOLATED LEAVES; MAMMALIAN-CELLS C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. FU NCI NIH HHS [P01-CA49210] NR 92 TC 90 Z9 91 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0893-228X J9 CHEM RES TOXICOL JI Chem. Res. Toxicol. PD MAY-JUN PY 1991 VL 4 IS 3 BP 256 EP 269 DI 10.1021/tx00021a001 PG 14 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Toxicology SC Pharmacology & Pharmacy; Chemistry; Toxicology GA FM137 UT WOS:A1991FM13700002 PM 1912307 ER PT J AU HERRMANN, WA ALBERTO, R BRYAN, JC SATTELBERGER, AP AF HERRMANN, WA ALBERTO, R BRYAN, JC SATTELBERGER, AP TI METAL-CARBONYL SYNTHESES .20. SIMPLE METHOD FOR THE PREPARATION OF TC(CO)3 COMPLEXES - SYNTHESIS, STRUCTURES, AND REACTIVITY OF THE NOVEL CUBANE-TYPE CLUSTER NA[TC3(CO)9(OCH3)4] SO CHEMISCHE BERICHTE LA German DT Article DE TECHNETIUM COMPLEXES; ISOCARBONYL LIGAND ID CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; LIGANDS; RE2(CO)10; ADDUCT AB Carbonyltechnetium complexes of type LTc(CO)3 are accessible along a simple route from Na[Tc3(CO)9(OCH3)4] (2) which represents a novel alkoxy complex of cubane-type geometry (single-crystal X-ray diffraction study). 2 is an isolable product of the incomplete carbonylation of sodium pertechnetate (1) conducted in methanol. Under carbon monoxide pressure, 2 yields the binary metal carbonyl Tc2(CO)10 (3), pentamethylcyclopentadiene gives the halfsandwich complex (eta-5-C5Me5)Tc(CO)3 (4), and with benzene/hydrochloric acid the ionic complex [(eta-6-C6H6)Tc(CO)3]Cl (5) is formed. C1 UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & STRUCT CHEM GRP,LOS ALAMOS,NM 87545. RP HERRMANN, WA (reprint author), TECH UNIV MUNICH,INST ANORGAN CHEM,LICHTENBERGSTR 4,W-8046 GARCHING,GERMANY. RI Herrmann, Wolfgang/A-3588-2010 NR 44 TC 21 Z9 21 U1 0 U2 3 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0009-2940 J9 CHEM BER JI Chem. Berichte PD MAY PY 1991 VL 124 IS 5 BP 1107 EP 1111 DI 10.1002/cber.19911240519 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA FN280 UT WOS:A1991FN28000018 ER PT J AU WANG, HH BENO, MA CARLSON, KD THORUP, N MURRAY, A PORTER, LC WILLIAMS, JM MALY, K BU, XH PETRICEK, V CISAROVA, I COPPENS, P JUNG, D WHANGBO, MH SCHIRBER, JE OVERMYER, DL AF WANG, HH BENO, MA CARLSON, KD THORUP, N MURRAY, A PORTER, LC WILLIAMS, JM MALY, K BU, XH PETRICEK, V CISAROVA, I COPPENS, P JUNG, D WHANGBO, MH SCHIRBER, JE OVERMYER, DL TI BEDT-TTF-BASED SYNMETAL - SYNTHESIS, STRUCTURE, ESR, AND ELECTRICAL-PROPERTIES OF (BEDT-TTF)HG0.776(SCN)2 SO CHEMISTRY OF MATERIALS LA English DT Article ID PRESSURE ORGANIC SUPERCONDUCTOR; DITHIOLO) TETRATHIOFULVALENE TRIIODIDE>; AMBIENT-PRESSURE; SPIN-RESONANCE; ELECTRONIC-STRUCTURES; NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; METAL; (BEDT-TTF)2I3; TEMPERATURE AB A new charge-transfer salt, (BEDT-TTF)Hg0.776(SCN)2 (BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene), has been synthesized and found to exhibit metallic conductivity to 13 K. This new synmetal has a composite columnar stack structure in which the BEDT-TTF donor molecule and SCN-ligands form one subsystem with a triclinic cell (P1BAR, with unit-cell dimensions a = 6.746 (2) angstrom, b = 4.114 (1) angstrom, c = 20.580 (3) angstrom, alpha = 83.06 (1)degrees, beta = 105.93 (2)degrees, gamma = 119.01 (2)degrees, V(c) = 480.23 angstrom-3, Z = 1), and the Hg atoms form a subsystem with a second triclinic cell (P1BAR, with unit-cell dimensions a = 6.578 (2) angstrom b = 5.302 (2) angstrom, c = 21.352 (6) angstrom, alpha = 73.10 (2)degrees, beta = 110.44 (3)degrees, V(c) = 618.85 angstrom-3, Z = 1). The two sublattices share the b-axis direction, which is the direction of molecular stacking, but the periodicity in this direction differs for the two sublattices. Since the SCN- ligands and the Hg atoms occur in different subsystems, the Hg coordination varies from unit cell to unit cell. The The interaction between the two sublattices gives rise to each being modulated. The modulation has been analyzed by use of the intensities of the satellite reflections. Four-probe resistivity and single-crystal ESR measurements show that (BEDT-TTF)Hg0.776(SCN)2 is metallic down to at least 13 K. Radio-frequency penetration depth studies at ambient pressure indicate that superconductivity is not observed down to 0.6 K. Tight-binding band electronic structure calculations on the "average structure" of the BEDT-TTF stacks show this material to be strictly one-dimensional. The conflict between this theoretical result and conductivity measurements appears to be resolved by use of a commensurate approximation to the modulation of the BEDT-TTF lattice in the band structure calculations. The Fermi surfaces based on the commensurate approximation are all closed; therefore, (BEDT-TTF)Hg0.776(SCN)2 is expected to be a two-dimensional metal. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SUNY BUFFALO,DEPT CHEM,BUFFALO,NY 14214. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. TECH UNIV DENMARK,DEPT CHEM,DK-2800 LYNGBY,DENMARK. UNIV TEXAS,DEPT CHEM,EL PASO,TX 79968. INST PHYS,DEPT STRUCT & BONDING,CS-18040 PRAGUE 8,CZECHOSLOVAKIA. RP WANG, HH (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Bu, Xianhui/L-9403-2013; Petricek, Vaclav/G-6868-2014; Cisarova, Ivana/B-1385-2017 OI Bu, Xianhui/0000-0002-2994-4051; Cisarova, Ivana/0000-0002-9612-9831 NR 55 TC 11 Z9 11 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAY-JUN PY 1991 VL 3 IS 3 BP 508 EP 513 DI 10.1021/cm00015a028 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FN827 UT WOS:A1991FN82700028 ER PT J AU AUBERT, JH SYLWESTER, AP AF AUBERT, JH SYLWESTER, AP TI MICROCELLULAR FOAMS - HERES HOW SO CHEMTECH LA English DT Article ID LOW-DENSITY; PHASE C1 SANDIA NATL LABS,DIV FUEL SCI,ALBUQUERQUE,NM 87185. RP AUBERT, JH (reprint author), SANDIA NATL LABS,DIV TARGET FABRICAT,DIV 1276,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 9 TC 5 Z9 6 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2703 J9 CHEMTECH JI Chemtech PD MAY PY 1991 VL 21 IS 5 BP 290 EP 295 PG 6 WC Chemistry, Applied SC Chemistry GA FL959 UT WOS:A1991FL95900010 ER PT J AU BRANDRIFF, BF GORDON, LA SEGRAVES, R PINKEL, D AF BRANDRIFF, BF GORDON, LA SEGRAVES, R PINKEL, D TI THE MALE-DERIVED GENOME AFTER SPERM-EGG FUSION - SPATIAL-DISTRIBUTION OF CHROMOSOMAL DNA AND PATERNAL-MATERNAL GENOMIC ASSOCIATION SO CHROMOSOMA LA English DT Article ID 1ST CELL-CYCLE; INSITU HYBRIDIZATION; HAMSTER EGGS; CHROMATIN; FERTILIZATION; SEQUENCE; PROTEINS; OOCYTES; NUCLEI AB After fusion with an egg, the haploid genome of a mammalian sperm expands from a volume of a few cubic microns to a volume of several thousand cubic microns in a fully developed zygote pronucleus. Using fluorescent in situ hybridization we studied two aspects of the chromatin organization of the sperm-derived genome during this process in a model system involving fusion of human sperm with hamster eggs. We found that (a) from the beginning of sperm head decondensation to early pronuclear stages, the hybridization signal of a probe targeted to the satellite III heterochromatin of chromosome 1 appeared as an irregularly shaped domain. In fully developed pronuclei, the signal became a fiber as much as 20-fold more extended compared with interphase somatic nuclei. The signal appeared as a string of non-uniformly distributed "beads" with interspersed gaps. A similar spatial distribution and appearance recurred after the first cleavage division. (b) Male- and female-derived genomes assembled non-randomly on the first mitotic spindle, and continued to be sequestered from each other in the nuclei of two-cell stages. RP BRANDRIFF, BF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,POB 808,L-452,LIVERMORE,CA 94550, USA. NR 26 TC 28 Z9 28 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0009-5915 J9 CHROMOSOMA JI Chromosoma PD MAY PY 1991 VL 100 IS 4 BP 262 EP 266 DI 10.1007/BF00344160 PG 5 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA FG970 UT WOS:A1991FG97000007 PM 2055136 ER PT J AU CHENG, RK SHEPHERD, IG AF CHENG, RK SHEPHERD, IG TI THE INFLUENCE OF BURNER GEOMETRY ON PREMIXED TURBULENT FLAME PROPAGATION SO COMBUSTION AND FLAME LA English DT Article ID COMBUSTION RP CHENG, RK (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV APPL SCI,COMBUST GRP,BERKELEY,CA 94720, USA. NR 32 TC 97 Z9 97 U1 0 U2 8 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAY PY 1991 VL 85 IS 1-2 BP 7 EP 26 DI 10.1016/0010-2180(91)90174-A PG 20 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA FN965 UT WOS:A1991FN96500002 ER PT J AU MANSOUR, MS BILGER, RW DIBBLE, RW AF MANSOUR, MS BILGER, RW DIBBLE, RW TI TURBULENT PARTIALLY PREMIXED FLAMES OF NITROGEN-DILUTED METHANE NEAR EXTINCTION SO COMBUSTION AND FLAME LA English DT Article ID NONPREMIXED FLAMES C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. RP MANSOUR, MS (reprint author), UNIV SYDNEY,DEPT MECH ENGN,SYDNEY,NSW 2006,AUSTRALIA. NR 17 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAY PY 1991 VL 85 IS 1-2 BP 215 EP 231 DI 10.1016/0010-2180(91)90189-I PG 17 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA FN965 UT WOS:A1991FN96500017 ER PT J AU GUNN, R AF GUNN, R TI GROUND LOOPS - WHAT THEY ARE, AND HOW TO AVOID THEM SO CONTROL ENGINEERING LA English DT Article RP GUNN, R (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0010-8049 J9 CONTROL ENG JI Control Eng. PD MAY PY 1991 VL 38 IS 7 BP 75 EP 77 PG 3 WC Automation & Control Systems; Engineering, Electrical & Electronic; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA FL643 UT WOS:A1991FL64300006 ER PT J AU MAX, N AF MAX, N TI UNIFIED SUN AND SKY ILLUMINATION FOR SHADOWS UNDER TREES SO CVGIP-GRAPHICAL MODELS AND IMAGE PROCESSING LA English DT Article RP MAX, N (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 TC 4 Z9 4 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 1049-9652 J9 CVGIP-GRAPH MODEL IM PD MAY PY 1991 VL 53 IS 3 BP 223 EP 230 DI 10.1016/1049-9652(91)90044-K PG 8 WC Computer Science, Software Engineering SC Computer Science GA FK102 UT WOS:A1991FK10200002 ER PT J AU AMENDOLA, R HAENDEL, S WEIER, HU PALLAVICINI, MG AF AMENDOLA, R HAENDEL, S WEIER, HU PALLAVICINI, MG TI TRANSGENE INTEGRATION IN HAIR-FOLLICLES AND PERIPHERAL-BLOOD CELLS MEASURED BY INVITRO DNA AMPLIFICATION AND FLUORESCENCE INSITU HYBRIDIZATION SO DNA AND CELL BIOLOGY LA English DT Article ID MICE; EXPRESSION; GLOBIN; GENE AB Screening of animals to detect the presence of integrated DNA sequences is an essential component of transgenic mouse generation. Rapid and sensitive detection techniques to facilitate identification of transgenic animals for biological studies or subsequent breeding programs are desirable. Most transgenics are generated on F1 backgrounds, thus determination of the histocompatibility status of neonates provides important diagnostic information for establishing congenic colonies. We describe the application of two assays, in vitro DNA amplification using the polymerase chain reaction (PCR) and fluorescence in situ hybridization with biotinylated DNA probes, to facilitate rapid detection of transgenes and their chromosomal integration patterns in young mice. A noninvasive PCR-based assay to detect the transgene in DNA contained in detergent-extracted hair follicles was developed for rapid screening. A total of 147 mice derived from F2, F3, and F4 generations of C57BL x F1(globin transgenics) were assayed to determine whether they carried a globin transgene. Characterization of animals by PCR-based amplification of the transgene was compared with that obtained using standard Southern analysis of DNA extracted from tails. Categorization of animals as positive (carrying the transgene) or negative using PCR was performed successfully in the initial assay with 95% of the animals. Fluorescence in situ hybridization with a DNA probe showing homology with a portion of the transgene was performed on metaphase and interphase cells to determine the integration pattern of the transgene. Our data showed that the transgene was integrated in a single chromosome. These techniques should facilitate rapid identification of transgenic animals and characterization of the genomic transgene integration patterns. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,L-452,LIVERMORE,CA 94550. FU PHS HHS [44047] NR 20 TC 4 Z9 4 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 1044-5498 J9 DNA CELL BIOL JI DNA Cell Biol. PD MAY PY 1991 VL 10 IS 4 BP 311 EP 317 DI 10.1089/dna.1991.10.311 PG 7 WC Biochemistry & Molecular Biology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Cell Biology; Genetics & Heredity GA FL557 UT WOS:A1991FL55700008 PM 2029339 ER PT J AU GRAHAM, RL HUNSAKER, CT ONEILL, RV JACKSON, BL AF GRAHAM, RL HUNSAKER, CT ONEILL, RV JACKSON, BL TI ECOLOGICAL RISK ASSESSMENT AT THE REGIONAL SCALE SO ECOLOGICAL APPLICATIONS LA English DT Article DE ADIRONDACK REGION; BARK BEETLE INFESTATION; DISTURBANCE; ECOLOGICAL RISK ASSESSMENT; REGIONAL RISK ASSESSMENT; RISK ASSESSMENT DEMONSTRATION; SCALE AB Ecological risk assessments are used by policymakers and regulatory agencies for balancing and comparing ecological risks associated with environmental hazards. An approach for regional-scale ecological risk assessment is described and demonstrated by modeling environmental risks associated with elevated ozone in a forested region. The demonstration illustrates (1) how a regional-scale risk assessment might be done, (2) the importance of spatial characteristics in considering regional-scale risk, and (3) the necessity of considering terrestrial and aquatic linkages. Generic problems often encountered when doing regional assessments, the foremost of which is the frequent lack of region-specific information and spatial data, are also highlighted. In the demonstration, two levels of elevated ozone and five different at-risk regional features are considered (forest cover, forest edge, forest interior, landscape pattern, and lake water quality). The mechanism for impacts on these features is ozone-induced stress in coniferous trees, patches of which can then be killed by bark beetle attacks. A stochastic spatial model of land-cover change is developed to evaluate the risks or probabilities of significant changes in the selected ecological features as a consequence of these ozone-triggered beetle attacks. Risk to regional water quality of lakes is evaluated by linking the land-cover output from the spatial stochastic model to an empirical water-quality model that is sensitive to land-cover changes within a lake's watershed. The risk analysis shows that those environmental features that are sensitive to the location of coniferous forest (such as forest edge) are at risk of a significant change due to ozone-induced conifer mortality even though overall coniferous forest cover is only slightly affected. The analysis also suggests a high probability of changes in regional water quality of lakes as a consequence of location-specific forest-cover change. C1 OAK RIDGE NATL LAB,DIV COMP & TELECOMMUN,OAK RIDGE,TN 37831. RP GRAHAM, RL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 33 TC 77 Z9 86 U1 3 U2 32 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD MAY PY 1991 VL 1 IS 2 BP 196 EP 206 DI 10.2307/1941812 PG 11 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA FP618 UT WOS:A1991FP61800009 PM 27755668 ER PT J AU ARTHUR, DL LEWIS, PS MEDVICK, PA FLYNN, ER AF ARTHUR, DL LEWIS, PS MEDVICK, PA FLYNN, ER TI A NEUROMAGNETIC STUDY OF SELECTIVE AUDITORY ATTENTION SO ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY LA English DT Article DE AUDITORY SELECTIVE ATTENTION; MAGNETOENCEPHALOGRAPHY; SOURCE LOCALIZATION; AUDITORY CORTEX; MRI; EQUIVALENT CURRENT DIPOLE ID TONOTOPIC ORGANIZATION; SINGLE NEURONS; CORTEX; POTENTIALS; MONKEY; FIELDS; WAVE AB Auditory event-related magnetic fields and electrical potentials were recorded from subjects who were instructed to attend to a sequence of constant pitch tones presented to one ear and ignore a concurrent sequence of tones with a different pitch presented to the other ear. Subjects' task was to detect and count longer duration 'target' tones (P = 0.1) interspersed with 'standard' tones (P = 0.4) in the attended ear and to ignore tones (both standards and targets) in the other ear. All stimuli both attended and ignored elicited a prominent response approximately 100 msec after tone onset (N1m). Beginning approximately 150 msec following stimulus onset an attetion-dependent modulation of the magnetic response (Ndm) was observed for each subject. In 2 subjects whose magnetic field patterns were mapped in detail, equivalent current dipole (ECD) modeling was used to estimate the sources of N1m and Ndm activity. By transforming the coordinate systems for magnetic resonance images (MRIs) and ECD solutions, the locations and orientations of ECDs were determined relative to each subject's brain structures. ECDs for both N1m and Ndm were located in auditory cortex along the posterior regions of the sylvian fissure. Monte Carlo error analyses indicated that the ECD for Ndm is near, but significantly anterior to that for N1m. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MECH & ENGN,INSTRUMENTAT GRP,LOS ALAMOS,NM 87545. RP ARTHUR, DL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,BIOPHYS GRP P6,POB 1663,MS-M715,LOS ALAMOS,NM 87545, USA. NR 32 TC 54 Z9 54 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0013-4694 J9 ELECTROEN CLIN NEURO JI Electroencephalogr. Clin. Neurophysiol. PD MAY PY 1991 VL 78 IS 5 BP 348 EP 360 DI 10.1016/0013-4694(91)90097-N PG 13 WC Engineering, Biomedical; Clinical Neurology SC Engineering; Neurosciences & Neurology GA FL582 UT WOS:A1991FL58200004 PM 1711454 ER PT J AU MARRONE, BL SIMPSON, DJ YOSHIDA, TM UNKEFER, CJ WHALEY, TW BUICAN, TN AF MARRONE, BL SIMPSON, DJ YOSHIDA, TM UNKEFER, CJ WHALEY, TW BUICAN, TN TI SINGLE CELL ENDOCRINOLOGY - ANALYSIS OF P-450SCC ACTIVITY BY FLUORESCENCE DETECTION METHODS SO ENDOCRINOLOGY LA English DT Note ID GRANULOSA AB A mechanism-based, fluorogenic probe for the cytochrome P-450scc (cholesterol side chain cleavage) enzyme, rate-limiting for the conversion of cholesterol to steroid hormones, is introduced and its application to the study of enzyme activity and regulation in single steroidogenic cells by several fluorescence detection methods is demonstrated. Reaction of the probe with P-450scc gives pregnenolone and the highly fluorescent resorufin anion. Spectroscopic changes in probe fluorescence, indicative of P-450scc activity, were monitored by steady-state fluorescence spectroscopy, flow cytometry, and microspectrofluorometry. This unique probe provides a nonradiometric indicator for real-time measurement of P-450scc activity in single living cells. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. RP MARRONE, BL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. FU NCRR NIH HHS [P41-RR01315]; NICHD NIH HHS [R01-HD22195] NR 9 TC 12 Z9 12 U1 0 U2 0 PU ENDOCRINE SOC PI BETHESDA PA 4350 EAST WEST HIGHWAY SUITE 500, BETHESDA, MD 20814-4110 SN 0013-7227 J9 ENDOCRINOLOGY JI Endocrinology PD MAY PY 1991 VL 128 IS 5 BP 2654 EP 2656 PG 3 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA FJ396 UT WOS:A1991FJ39600061 PM 2019272 ER PT J AU ROSS, M FENG, L AF ROSS, M FENG, L TI THE ENERGY EFFICIENCY OF THE STEEL-INDUSTRY OF CHINA SO ENERGY LA English DT Article AB The Chinese iron and steel industry of 1987 is described in terms of energy consumption and production statistics and compared with the U.S. industry to clarify the major differences. The Chinese industry includes many plants which are extremely small by U.S. standards and use antiquated technology, but this segment is responsible for only 25% of steel production. The more modern key plants of the Chinese industry have an adjusted energy intensity just 20% higher than the U.S. average. The adjustment includes the effect of very large production of cast-iron products in China. Two other major characteristics of the Chinese industry which distinguish it from that of the U.S. are: (1) much lower use of scrap from sources external to the steel industry and (2) much less ambitious shaping and treating of final products. The use of scrap reduces overall energy intensity. The manufacture of more complex and higher quality products increases overall energy intensity. If the Chinese industry could take on the characteristics of the U.S. industry in these two respects, other things being equal, the overall energy intensity would remain about 20% higher. The reasons for this residual difference and the potential of new technology for the Chinese industry are briefly discussed. RP ROSS, M (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV APPL SCI,ENERGY ANAL PROGRAM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 19 TC 10 Z9 10 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD MAY PY 1991 VL 16 IS 5 BP 833 EP 848 DI 10.1016/0360-5442(91)90071-S PG 16 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA FC311 UT WOS:A1991FC31100004 ER PT J AU SCHEPPELE, SE NUTTER, GL PARISI, DL AF SCHEPPELE, SE NUTTER, GL PARISI, DL TI OPTIMIZING PERFORMANCE OF DOUBLE-FOCUSING MASS SPECTROMETERS .1. DETERMINATION AND USE OF TOTAL ABERRATIONS SO ENERGY & FUELS LA English DT Article ID PETROLEUM; DISTILLATES AB Ion intensity is an important factor in determining the repeatability of type analyses. Consideration of ion intensity is exceedingly important in methods of type analysis employing double-focusing mass spectrometers because the sensitivity of these instruments decreases with increasing resolving power. Furthermore, this decrease is essentially linear only over a moderate range of resolving powers and exceeds linearity at higher resolving powers. The ion intensity at a given resolving power is a function of the magnitude of the total aberrations, the width of the source slit, and the value of the transmission. The transmission is the ratio of the beam width at the collector slit to the width of the collector slit. Equations are given for calculating values of the total aberrations from resolving powers obtained at two or more sets of values for the ion source slit width (omega-s) and the transmission (T). Values of the aberrations are used in calculating the optimum values of omega-s and T in order to implement a procedure described for obtaining a resolving power with maximum ion intensity. The reduction in ion intensity resulting from use of nonoptimum values of omega-s and T is considered for different ratios of the resolving power to the aberrations. The effect of the aberrations on analytical repeatability is discussed. C1 US DOE,BARTLESVILLE PROJECT OFF,BARTLESVILLE,OK 74003. RP SCHEPPELE, SE (reprint author), AMOCO RES CTR,NAPERVILLE,IL 60566, USA. NR 51 TC 2 Z9 2 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1991 VL 5 IS 3 BP 360 EP 370 DI 10.1021/ef00027a002 PG 11 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FM557 UT WOS:A1991FM55700003 ER PT J AU ELLIOTT, DC BECKMAN, D BRIDGWATER, AV DIEBOLD, JP GEVERT, SB SOLANTAUSTA, Y AF ELLIOTT, DC BECKMAN, D BRIDGWATER, AV DIEBOLD, JP GEVERT, SB SOLANTAUSTA, Y TI DEVELOPMENTS IN DIRECT THERMOCHEMICAL LIQUEFACTION OF BIOMASS - 1983-1990 SO ENERGY & FUELS LA English DT Review ID RAPID AQUEOUS THERMOLYSIS; VACUUM-PYROLYSIS OILS; FLASH PYROLYSIS; HZSM-5 CATALYST; DIFFERENT LIGNOCELLULOSICS; MOLECULAR CHARACTERIZATION; CHEMICAL FEEDSTOCKS; WOOD LIQUEFACTION; HYDROCARBON FUELS; PEAT LIQUIDS AB This review catalogs the process research in direct thermochemical conversion of biomass to liquid hydrocarbon fuels. Subject areas include pyrolysis, high-pressure liquefaction, upgrading of both pyrolysates and high-pressure oils, supporting analytical and basic research, and technoeconomic assessments. Much progress is presented for the time period from 1983 to 1990. The pyrolytic processes with lower investment costs and higher yields of more oxygenated oils are moving more quickly forward in development. Further development is still required for the upgrading processes for the production of hydrocarbons from the primary oils. Based on the developments, potential exists for economical production of substitute liquid hydrocarbon fuels and chemicals from biomass. C1 ZETON INC, BURLINGTON, ONTARIO, CANADA. ASTON UNIV, BIRMINGHAM, ENGLAND. SOLAR ENERGY RES INST, GOLDEN, CO 80401 USA. CHALMERS UNIV TECHNOL, S-41296 GOTHENBURG, SWEDEN. TECH RES CTR FINLAND, SF-02150 ESPOO 15, FINLAND. RP PACIFIC NW LAB, BOX 999, RICHLAND, WA 99352 USA. NR 165 TC 196 Z9 206 U1 1 U2 47 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0887-0624 EI 1520-5029 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1991 VL 5 IS 3 BP 399 EP 410 DI 10.1021/ef00027a008 PG 12 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FM557 UT WOS:A1991FM55700009 ER PT J AU PENN, JH OWENS, WH SHADLE, LJ AF PENN, JH OWENS, WH SHADLE, LJ TI ULTRARAPID FLASHLAMP PYROLYSIS - THERMAL VERSUS PHOTOCHEMICAL-REACTION PATHWAYS SO ENERGY & FUELS LA English DT Article ID MODEL COMPOUNDS; COAL MACERALS; TEMPERATURE; THERMOLYSIS; BIBENZYL AB A xenon flashlamp has been used to rapidly heat organic substrates coated onto graphite particles by conversion of photochemical energy into thermal energy within the graphite particles, resulting in heating rates of 10(5)-degrees-C/s (i.e., ultrarapid pyrolysis). The compounds chosen for ultrarapid pyrolysis have been carefully selected to verify whether the reported reactions are due to photochemical or thermal activation. Bibenzyl yields primarily acetylene when subjected to flashlamp conditions. In contrast, traditional thermal or photochemical excitation yields products which may be rationalized by cleavage of the central C-C bond to yield benzyl radicals. 1,6-Diphenylhexane also yields acetylene with a significant amount of ethylene when exposed to ultrarapid heating conditions. With traditional heating and photochemical reaction conditions, no products can be found. 1,4-Dibenzoylbutane yields the normal Norrish type II cleavage products upon photoexcitation and no products upon thermal excitation at 650-degrees-C. In contrast, ultrarapid pyrolysis yields acetylene and a small amount of benzaldehyde. Taken together these results indicate that photochemical reactions cannot be responsible for the observed reactions. Since the ultrarapid pyrolysis products differ from those observed with traditional heating techniques, the ultrarapid pyrolysis products are attributed to higher temperature (> 1000-degrees-C) thermal activation. C1 US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26505. RP PENN, JH (reprint author), W VIRGINIA UNIV,DEPT CHEM,MORGANTOWN,WV 26506, USA. OI Shadle, Lawrence/0000-0002-6283-3628 NR 39 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1991 VL 5 IS 3 BP 436 EP 440 DI 10.1021/ef00027a013 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FM557 UT WOS:A1991FM55700014 ER PT J AU WROBLEWSKI, AE LENSINK, C VERKADE, JG AF WROBLEWSKI, AE LENSINK, C VERKADE, JG TI P-31 NMR-SPECTROSCOPY FOR LABILE HYDROGEN GROUP-ANALYSIS - TOWARD QUANTITATION OF PHENOLS IN A COAL CONDENSATE SO ENERGY & FUELS LA English DT Article AB The chlorophospholanes ClP activated OC(CH3)2C(CH3)2O (1) and ClP activated SCH2CH2S (2) are utilized and compared as P-31 NMR tagging agents for quantifying labile hydrogen functional groups known to be present in coal materials. The evaluation of these reagents was carried out with the use of model mixtures of phenols. After development of optimum NMR conditions with the model mixtures, quantitative analyses of an Illinois No. 6 low-temperature pyrolysis condensate were obtained with 1 and 2. The better analytical results with reagent 2 compared with 1 are tentatively attributed to greater P-31 chemical shift sensitivity as a result of decreased ring strain and increased hybridizational flexibility in 2. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES LAB,AMES,IA 50011. NR 13 TC 10 Z9 11 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1991 VL 5 IS 3 BP 491 EP 496 DI 10.1021/ef00027a023 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FM557 UT WOS:A1991FM55700024 ER PT J AU REYNOLDS, JG CRAWFORD, RW BURNHAM, AK AF REYNOLDS, JG CRAWFORD, RW BURNHAM, AK TI ANALYSIS OF OIL-SHALE AND PETROLEUM SOURCE ROCK PYROLYSIS BY TRIPLE QUADRUPOLE MASS-SPECTROMETRY - COMPARISONS OF GAS EVOLUTION AT THE HEATING RATE OF 10-DEGREES-C MIN SO ENERGY & FUELS LA English DT Article ID ORGANIC-MATTER; SULFUR; GENERATION; KEROGENS; HYDROCARBONS; KINETICS; COAL AB Kimmeridge, Phosphoria, La Luna, Teistberget, New Albany, Janusfjellet, Wenzen, Maoming, Fushun, Woodford, and three Green River oil shales were subjected to programmed-temperature pyrolysis at a heating rate of 10-degrees-C/min using triple-quadrupole mass spectrometry as the detection method. Volatile compound evolution, including hydrocarbons, noncondensible gases, and heteroatomic compounds, was monitored by on-line detection. As expected, the temperatures of maximum evolution rate (T(max)) depended on the sample and the species evolving. The T(max) values for generation of total light volatile organic compounds were between 442 and 472-degrees-C, with the New Albany (eastern U.S. Devonian) giving the lowest values and Brotherson (Green River formation) giving the highest values. The heteroatomic species had T(max) values that were slightly lower than those for hydrocarbon evolution. Non-hydrocarbon gas formation, particularly H2S, CO2, CO, and H2O, was highly dependent upon the mineral matrix and mineral matrix-kerogen interactions of the shale. RP REYNOLDS, JG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 46 TC 23 Z9 25 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1991 VL 5 IS 3 BP 507 EP 523 DI 10.1021/ef00027a025 PG 17 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FM557 UT WOS:A1991FM55700026 ER PT J AU COOPER, RC SCHIPPER, L AF COOPER, RC SCHIPPER, L TI THE SOVIET ENERGY-CONSERVATION DILEMMA SO ENERGY POLICY LA English DT Article DE EFFICIENCY; BARRIERS; STRUCTURAL CHANGE AB We have made an extensive analysis of the structure of energy-use in the USSR, since 1960. Based on this work, we find that the opportunities for energy conservation in the USSR are truely enormous. Were the energy intensities of the major activities in the USSR to fall to the levels of Western Europe, energy-use in the USSR in 1985 would have been one third lower than it actually was. The problems in obtaining increased efficiencies are more institutional than technical: the USSR has had little economic incentive to invest in more efficient energy-use. Energy prices are determined by a central pricing authority and have not kept pace with world energy prices or with the costs of domestic energy production. The dilemma for the USSR is that energy inefficiency is really a product of all the other inefficiencies in the Soviet economy and can only improve if the entire economy improves. Changes in the mix of goods produced could also lower Soviet energy-use in industry and for freight. However, economic reform may also bring a surge in the demand for personal mobility, home comfort, and greater activity in the service sector, important sectors of energy growth in the West. Thus economic structural change in the USSR will be a two edged sword. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, ENERGY ANAL PROGRAM, INT ENERGY STUDIES GRP, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, ENERGY ANAL PROGRAM, INT ENERGY STUDIES GRP, BERKELEY, CA 94720 USA. RP COOPER, RC (reprint author), UNIV CALIF BERKELEY, ENERGY & RESOURCES GRP, BERKELEY, CA 94720 USA. NR 30 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0301-4215 EI 1873-6777 J9 ENERG POLICY JI Energy Policy PD MAY PY 1991 VL 19 IS 4 BP 344 EP 363 DI 10.1016/0301-4215(91)90058-V PG 20 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA FQ422 UT WOS:A1991FQ42200007 ER PT J AU REYNOLDS, TD AF REYNOLDS, TD TI MOVEMENT OF GRAVEL BY THE OWYHEE HARVESTER ANT, POGONOMYRMEX-SALINUS (HYMENOPTERA, FORMICIDAE) SO ENTOMOLOGICAL NEWS LA English DT Article AB Colored aquarium gravel was used in a study to determine the source of small fossil and modern zoological and archeological specimens accumulated in the mounds of harvester ants. Results suggest that mature colonies of harvester ants collect, rather than excavate, most of the materials used to reconstruct mounds. RP REYNOLDS, TD (reprint author), US DOE,RADIOL & ENVIRONM SCI LAB,785 DOE PL,IDAHO FALLS,ID 83402, USA. NR 0 TC 2 Z9 3 U1 0 U2 2 PU AMER ENTOMOL SOC PI PHILADELPHIA PA 1900 BENJ FRANKLIN PARKWAY, PHILADELPHIA, PA 19103-1195 SN 0013-872X J9 ENTOMOL NEWS JI Entomol. News PD MAY-JUN PY 1991 VL 102 IS 3 BP 118 EP 124 PG 7 WC Entomology SC Entomology GA FU262 UT WOS:A1991FU26200002 ER PT J AU TRAVIS, CC HESTER, ST AF TRAVIS, CC HESTER, ST TI GLOBAL CHEMICAL POLLUTION SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID VOLATILE ORGANIC-COMPOUNDS; POLYCHLORINATED-BIPHENYLS; BLOOD; PCDDS; PCDFS; DEPOSITION; POLLUTANTS; EMISSIONS; LANDFILLS; EXPOSURES C1 OAK RIDGE NATL LAB,INTEGRATED LAB SYST,OAK RIDGE,TN 37831. RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,OFF RISK ANAL,OAK RIDGE,TN 37831, USA. NR 50 TC 33 Z9 34 U1 2 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAY PY 1991 VL 25 IS 5 BP 814 EP 819 DI 10.1021/es00017a001 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FK083 UT WOS:A1991FK08300003 ER PT J AU GRAY, RH AF GRAY, RH TI CLEANING UP RADIOACTIVE AND CHEMICAL WASTE SITES - IS THE BENEFIT WORTH THE COST AND RISK SO FISHERIES LA English DT Article RP GRAY, RH (reprint author), PACIFIC NW LAB, OFF HANFORD ENVIRONM, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER FISHERIES SOC PI BETHESDA PA 5410 GROSVENOR LANE SUITE 110, BETHESDA, MD 20814-2199 SN 0363-2415 J9 FISHERIES JI Fisheries PD MAY-JUN PY 1991 VL 16 IS 3 BP 2 EP 3 PG 2 WC Fisheries SC Fisheries GA FT289 UT WOS:A1991FT28900002 ER PT J AU DUGAN, PR QUIGLEY, DR AF DUGAN, PR QUIGLEY, DR TI SYMPOSIUM ON BIOTECHNOLOGY FOR THE PRODUCTION OF CLEAN FUELS SO FUEL LA English DT Editorial Material AB Of the 13 manuscripts in this symposium, nine dealt with aspects of the biomodification of coals and four with bioconversion of methane and synthesis gases and hydrogen. One additional presentation dealt with the biological recovery of spent molybdenum coal liquefaction catalysts but was withdrawn from this publication. RP DUGAN, PR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,CTR BIOPROC & BIOTECHNOL GRP,IDAHO FALLS,ID 83401, USA. NR 0 TC 1 Z9 1 U1 1 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD MAY PY 1991 VL 70 IS 5 BP 571 EP 572 DI 10.1016/0016-2361(91)90166-8 PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FL494 UT WOS:A1991FL49400001 ER PT J AU QUIGLEY, DR BRECKENRIDGE, CR POLMAN, JK DUGAN, PR AF QUIGLEY, DR BRECKENRIDGE, CR POLMAN, JK DUGAN, PR TI HYDROGEN-PEROXIDE, PEROXIDASE AND LOW RANK COAL SO FUEL LA English DT Article; Proceedings Paper CT SYMP ON BIOTECHNOLOGY FOR THE PRODUCTION OF CLEAN FUELS CY AUG 27-28, 1990 CL WASHINGTON, DC DE COAL; PEROXIDASES; BIOSOLUBILIZATION ID POLYPORUS-VERSICOLOR; CORIOLUS-VERSICOLOR; SOLUBILIZATION AB Horseradish peroxidase was tested to determine if it catalysed any reaction between coal and hydrogen peroxide. Experiments were performed in aqueous buffers of pH 5.0, 6.5 or 8.0 and used either Wyodak, Beulah Zap, Texas lignite, Mississippi Wilcox lignite or solubilized Mississppi Wilcox lignite. Reactions were monitored by determining the amounts of hydrogen peroxide consumed at various points in time. All coals reacted rapidly with hydrogen peroxide in the absence of peroxidase and these reaction rates increased as pH increased. Horseradish peroxidase did not measurably increase the reaction rates even when present in large concentrations. These data suggest that coal is not a substrate for horseradish peroxidase. RP QUIGLEY, DR (reprint author), IDAHO NATL ENGN LAB,CTR BIOPROC TECHNOL,BIOTECHNOL UNIT,IDAHO FALLS,ID 83415, USA. NR 18 TC 2 Z9 2 U1 0 U2 6 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD MAY PY 1991 VL 70 IS 5 BP 581 EP 583 DI 10.1016/0016-2361(91)90169-B PG 3 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FL494 UT WOS:A1991FL49400004 ER PT J AU ANDREWS, G AF ANDREWS, G TI MASS AND ENERGY-BALANCE CONSTRAINTS ON THE BIOLOGICAL PRODUCTION OF CHEMICALS FROM COAL SO FUEL LA English DT Article; Proceedings Paper CT SYMP ON BIOTECHNOLOGY FOR THE PRODUCTION OF CLEAN FUELS CY AUG 27-28, 1990 CL WASHINGTON, DC DE COAL; BIOPROCESSING; CHEMICALS AB Several organic chemicals, including methane and ethanol, may be produced by the bioprocessing of coal. This may be done either by direct microbial attack on the coal, or indirectly by the bioprocessing of solubilized coal. As in chemical liquefaction and gasification, the relative amounts of the various products that can be produced are severely constrained by mass and energy balance considerations. The main differences in biological processing are that water is a ubiquitous reactant, carbon dioxide a common product and that some of the carbon and nitrogen in the coal may go to the synthesis of new biomass rather than products. The conventional biotechnological yield analysis applied to coal processing has several interesting consequences. The mass balance reduces to a balance of available electrons, and coal has a similar oxidation/reduction state to both carbohydrates and biomass. This makes high product yields feasible particularly under anaerobic conditions, although leaving open the question of whether the relevant hydrolase enzymes exist. Recommendations are made on products, and combinations of two products, that may be made with high yields and economic return. The energy balance provides little extra information. A general intracellular energy balance can be written in terms of the production and consumption of ATP, but much of the necessary information on the metabolic pathways is currently not available for coal processing micro-organisms. RP ANDREWS, G (reprint author), IDAHO NATL ENGN LAB,BIOCHEM ENGN,POB 1625,IDAHO FALLS,ID 83415, USA. NR 9 TC 1 Z9 1 U1 1 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD MAY PY 1991 VL 70 IS 5 BP 585 EP 589 DI 10.1016/0016-2361(91)90170-F PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FL494 UT WOS:A1991FL49400005 ER EF