FN Thomson Reuters Web of Science™ VR 1.0 PT J AU DUNLAP, DH LAVIOLETTE, RA PARRIS, PE AF DUNLAP, DH LAVIOLETTE, RA PARRIS, PE TI THE SPATIAL EVOLUTION OF PARTICLES DIFFUSING IN THE PRESENCE OF RANDOMLY PLACED TRAPS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DYNAMICAL CONSEQUENCE; DISORDERED-SYSTEMS; RANDOM-MEDIA; RANDOM-WALK; LOCALIZATION AB The evolution of a particle undergoing a continuous-time random walk in the presence of randomly placed imperfectly absorbing traps is studied. At long times, the spatial probability distribution becomes strongly localized in a sequence of trap-free regions. The subsequent intermittent transfer of the survival probability from small trap-free regions to larger trap-free regions is described as a time-directed variable range hopping among localized eigenstates in the Lifshitz tail. An asymptotic expression for the configurational average of the spatial distribution of surviving particles is obtained based on this description. The distribution is an exponential function of distance which expands superdiffusively, with the mean-square displacement increasing with time as t(2)/ln((2D+4)/D)(t) in D dimensions. C1 UNIV NEW MEXICO, DEPT PHYS & ASTRON, ALBUQUERQUE, NM 87131 USA. UNIV MISSOURI, DEPT PHYS, ROLLA, MO 65401 USA. UNIV MISSOURI, INST ELECTR MAT, ROLLA, MO 65401 USA. RP EG&G IDAHO INC, IDAHO NATL ENGN LAB, POB 1625, IDAHO FALLS, ID 83415 USA. NR 29 TC 5 Z9 5 U1 2 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1994 VL 100 IS 11 BP 8293 EP 8300 DI 10.1063/1.467261 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NN731 UT WOS:A1994NN73100048 ER PT J AU WOZNY, CE SUMPTER, BG NOID, DW AF WOZNY, CE SUMPTER, BG NOID, DW TI THE EXISTENCE OF NONLINEAR RESONANCES IN COLLECTIVE MODES OF LINEAR MACROMOLECULES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID H STRETCHING REGION; SEMICLASSICAL CALCULATION; POLYMETHYLENE CHAIN; OSCILLATOR-SYSTEMS; FERMI RESONANCE; BOUND-STATES; BEHAVIOR; SPECTRA AB A Lissajous figure and surfaces of section are presented which show a 4:7 nonlinear resonance between two selectively excited coordinates of a system containing 900 degrees of freedom. The significance of this work is, first, plots of this nature have never before been constructed for a multidimensional system this large; and second, the nonlinear resonance exists between two collective modes of the linear macromolecule. RP WOZNY, CE (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 15 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1994 VL 100 IS 11 BP 8540 EP 8541 DI 10.1063/1.466754 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NN731 UT WOS:A1994NN73100080 ER PT J AU RICE, BM GARRETT, BC KOSZYKOWSKI, ML FOILES, SM DAW, MS AF RICE, BM GARRETT, BC KOSZYKOWSKI, ML FOILES, SM DAW, MS TI KINETIC ISOTOPE EFFECTS FOR HYDROGEN DIFFUSION IN BULK NICKEL AND ON NICKEL SURFACES (VOL 92, PG 775, 1990) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Correction C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. SANDIA NATL LABS, LIVERMORE, CA 94551 USA. RP RICE, BM (reprint author), USA, RES LAB, ABERDEEN PROVING GROUND, MD 21005 USA. RI Garrett, Bruce/F-8516-2011 NR 1 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1994 VL 100 IS 11 BP 8556 EP 8556 DI 10.1063/1.467289 PG 1 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NN731 UT WOS:A1994NN73100085 ER PT J AU HOLMES, HF MESMER, RE AF HOLMES, HF MESMER, RE TI AN ISOPIESTIC STUDY OF ((1-Y)NAHSO4+YNA2SO4) (AQ) AT ELEVATED-TEMPERATURES SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID ALKALI-METAL SULFATES; AQUEOUS-SOLUTIONS; THERMODYNAMIC PROPERTIES; ACTIVITY-COEFFICIENTS; OSMOTIC COEFFICIENTS; 298.15-K; ((1-Y)H2SO4+YNA2SO4)(AQ); 250-DEGREES-C; 25-DEGREES-C; ELECTROLYTES RP HOLMES, HF (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 11 Z9 11 U1 1 U2 2 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD JUN PY 1994 VL 26 IS 6 BP 581 EP 594 DI 10.1006/jcht.1994.1067 PG 14 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA NP266 UT WOS:A1994NP26600004 ER PT J AU ELLING, JW MNISZEWSKI, SM ZAHRT, JD KLATT, LN AF ELLING, JW MNISZEWSKI, SM ZAHRT, JD KLATT, LN TI AUTOMATED CHROMATOGRAPHIC DATA INTERPRETATION USING AN EXPERT-SYSTEM SO JOURNAL OF CHROMATOGRAPHIC SCIENCE LA English DT Article ID SEDIMENTS C1 OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,OAK RIDGE,TN 37831. RP ELLING, JW (reprint author), LOS ALAMOS NATL LAB,SENSOR SYST & ROBOT GRP,MAILSTOP J580,LOS ALAMOS,NM 87545, USA. OI Elling, John/0000-0002-1119-1442 NR 11 TC 10 Z9 10 U1 0 U2 0 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0021-9665 J9 J CHROMATOGR SCI JI J. Chromatogr. Sci. PD JUN PY 1994 VL 32 IS 6 BP 213 EP 218 PG 6 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NR129 UT WOS:A1994NR12900002 ER PT J AU MEZA, JC MARTINEZ, ML AF MEZA, JC MARTINEZ, ML TI DIRECT SEARCH METHODS FOR THE MOLECULAR-CONFORMATION PROBLEM SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID OPTIMIZATION AB An important area of research in computational biochemistry is the design of molecules for specific applications. The design of these molecules, which depends on the accurate determination of their three-dimensional structure, can be formulated as a global optimization problem. In this article, we present results from the application of a new conformation searching method based on direct search methods. We compare these results to some earlier results using genetic algorithms and simulated annealing. (C) 1994 John Wiley & Sons, Inc. RP MEZA, JC (reprint author), SANDIA NATL LABS, DEPT COMP SCI, LIVERMORE, CA 94551 USA. NR 20 TC 28 Z9 28 U1 0 U2 1 PU JOHN WILEY & SONS INC PI HOBOKEN PA 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD JUN PY 1994 VL 15 IS 6 BP 627 EP 632 DI 10.1002/jcc.540150606 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA NL343 UT WOS:A1994NL34300005 ER PT J AU FERNANDO, GW WEINERT, M WATSON, RE DAVENPORT, JW AF FERNANDO, GW WEINERT, M WATSON, RE DAVENPORT, JW TI POINT GROUP SYMMETRIES AND GAUSSIAN INTEGRATION SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article AB A computationally efficient and exact method of symmetrizing a complete set of angular functions using Gaussian integration is presented. This technique will be useful in situations such as crystal field-type calculations, full potential electronic structure calculations, and wherever symmetrized functions of a given irreducible representation are needed. As an example, combinations of spherical harmonics transforming as the completely symmetric irreducible representation are given for all the 32 crystallographic point groups in three dimensions. (C) 1994 Academic Press, Inc. C1 UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269. RP FERNANDO, GW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUN PY 1994 VL 112 IS 2 BP 282 EP 290 DI 10.1006/jcph.1994.1100 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NP005 UT WOS:A1994NP00500008 ER PT J AU PANDAY, S WU, YS HUYAKORN, PS SPRINGER, EP AF PANDAY, S WU, YS HUYAKORN, PS SPRINGER, EP TI A 3-DIMENSIONAL MULTIPHASE FLOW MODEL FOR ASSESSING NAPL CONTAMINATION IN POROUS AND FRACTURED MEDIA .2. POROUS-MEDIUM SIMULATION EXAMPLES SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID GROUNDWATER CONTAMINATION AB This paper discusses the verification and application of the three-dimensional (3-D) multiphase flow model presented by Huyakom et al. (Part 1 in this issue) for assessing contamination due to subsurface releases of non-aqueous-phase liquids (NAPL's). Attention is focussed on situations involving one-, two- and three-dimensional flow through porous media. The model formulations and numerical schemes are tested for highly nonlinear field conditions. The utility and accuracy of various simplifications to certain simulation scenarios are assessed. Five simulation examples are included for demonstrative purposes. The first example verifies the model for vertical flow and compares the performance of the fully three-phase and the passive-air-phase formulations. Air-phase boundary conditions are noted to have considerable effects on simulation results. The second example verifies the model for cross-sectional analyses involving LNAPL and DNAPL migration. Finite-difference (5-point) and finite-element (9-point) spatial approximations are compared for different grid aspect ratios. Unless corrected, negative-transmissivity conditions were found to have undesirable impact on the finite-element solutions. The third example provides a model validation against laboratory experimental data on 5-spot water-flood treatment of oil reservoirs. The sensitivity to grid orientation is noted for the finite-difference schemes. The fourth example demonstrates model utility in characterizing the 3-D migration of LNAPL and DNAPL from surface sources. The final example presents a modeling study of air sparging. Critical parameters affecting the performance of air-sparging system are examined. In general, the modeling results indicate sparging is more effective in water-retentive soils, and larger values of sparge influence radius may be achieved for certain anisotropic conditions. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP PANDAY, S (reprint author), HYDROGEOLOG INC,SUITE 900,1165 HERNDON PKWY,HERNDON,VA 22070, USA. RI Wu, Yu-Shu/A-5800-2011; Springer, Everett/B-6376-2012 OI Springer, Everett/0000-0002-9816-8148 NR 16 TC 24 Z9 28 U1 4 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD JUN PY 1994 VL 16 IS 2 BP 131 EP 156 DI 10.1016/0169-7722(94)90049-3 PG 26 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA NU395 UT WOS:A1994NU39500002 ER PT J AU KWON, DS BOOK, WJ AF KWON, DS BOOK, WJ TI A TIME-DOMAIN INVERSE DYNAMIC TRACKING CONTROL OF A SINGLE-LINK FLEXIBLE MANIPULATOR SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB A manipulator system with a large workspace volume and high payload capacity has greater link flexibility than do typical industrial robots and teleoperators. If link flexibility is significant, position control of the manipulator's end-effector exhibits nonminimum-phase, noncollocated, and flexible-structure system control problems. This paper addresses inverse dynamic trajectory planning issues of a single-link flexible manipulator. The inverse dynamic equation of a single-link flexible manipulator was solved in the time-domain. By dividing the inverse system equation into its causal part and anticausal part, the in verse dynamic method calculates the feed-forward torque and the trajectories of all state variables that do not excite structural vibrations for a given end-point trajectory. Through simulation and experiment with a single-link manipulator, the effectiveness of the inverse dynamic method in producing fast and vibration-free motion has been demonstrated. C1 GEORGIA INST TECHNOL,GEORGE W WOODRUFF SCH MECH ENGN,ATLANTA,GA 30332. RP KWON, DS (reprint author), OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,OAK RIDGE,TN 37831, USA. NR 15 TC 81 Z9 82 U1 0 U2 10 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD JUN PY 1994 VL 116 IS 2 BP 193 EP 200 DI 10.1115/1.2899210 PG 8 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA NT348 UT WOS:A1994NT34800003 ER PT J AU CINQUE, RB MORRIS, JW AF CINQUE, RB MORRIS, JW TI THE EFFECT OF GOLD-NICKEL METALLIZATION MICROSTRUCTURE ON FLUXLESS SOLDERING SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE AUGER MICROSCOPY; FLUXLESS SOLDERING; OXIDATION ID DIFFUSION; FILMS; COPPER AB Gold plating is used in the microelectronics industry to maintain the wettability of metal substrates. The nature of wetting during soldering of gold plated metals is discussed, and the results of experiments on the fluxless wettability and oxidation of gold plated nickel are described. The results suggest that electrodeposition of a thin gold plate (0.14 mum) and the concurrent reduction of nickel oxide produce a gold-nickel system which will wet without flux. Oxidation of nickel was observed to occur via nickel out-diffusion and by direct exposure of the substrate through pinhole plating defects. Auger chemical analysis indicates that pinholes do not produce oxidation of the surrounding substrate area. C1 LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP CINQUE, RB (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 20 TC 9 Z9 9 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUN PY 1994 VL 23 IS 6 BP 533 EP 539 DI 10.1007/BF02670656 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA NP306 UT WOS:A1994NP30600008 ER PT J AU BERRYMAN, JG AF BERRYMAN, JG TI ROLE OF POROSITY IN ESTIMATES OF COMPOSITE ELASTIC-CONSTANTS SO JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB The presence of small amounts of residual void space (on the order of one percent by volume) is sufficient to make estimates of composite elastic constants (obtained while ignoring this porosity) violate the Hashin-Shtrikman bounds in many cases. Experimental values failing below the incorrectly estimated lower bound is the normal direction of violation, but erroneous neglect of porosity in ''pure'' samples can also lead to experimental values rising above the incorrectly computed upper bound. Examples are presented to illustrate the nature of the error and methods of correcting it for data on composite ceramics. The result is improved agreement between the Hashin-Shtrikman bounds, effective medium theory estimates, and experimental data. RP BERRYMAN, JG (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808-L-202,LIVERMORE,CA 94550, USA. RI Berryman, James/A-9712-2008 NR 0 TC 17 Z9 17 U1 1 U2 6 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0195-0738 J9 J ENERG RESOUR-ASME JI J. Energy Resour. Technol.-Trans. ASME PD JUN PY 1994 VL 116 IS 2 BP 87 EP 96 DI 10.1115/1.2906023 PG 10 WC Energy & Fuels SC Energy & Fuels GA NT464 UT WOS:A1994NT46400001 ER PT J AU DOUGLASS, RW RAMSHAW, JD AF DOUGLASS, RW RAMSHAW, JD TI FUTURE-RESEARCH DIRECTIONS IN COMPUTATIONAL FLUID-DYNAMICS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Editorial Material ID FLOWS; EQUATIONS AB The current state of computational fluid dynamics (CFD) has yet to reach its full promise as a general tool for engineering design and simulation. Research in the areas of code robustness, complex flows of real fluids, and numerical errors and resolution are proposed as directions aiming toward that goal. We illustrate some of the current CFD challenges using selected applications. RP DOUGLASS, RW (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 13 TC 6 Z9 6 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD JUN PY 1994 VL 116 IS 2 BP 212 EP 215 DI 10.1115/1.2910256 PG 4 WC Engineering, Mechanical SC Engineering GA NV451 UT WOS:A1994NV45100007 ER PT J AU BAKER, DN PULKKINEN, TI HONES, EW BELIAN, RD MCPHERRON, RL ANGELOPOULOS, V AF BAKER, DN PULKKINEN, TI HONES, EW BELIAN, RD MCPHERRON, RL ANGELOPOULOS, V TI SIGNATURES OF THE SUBSTORM RECOVERY PHASE AT HIGH-ALTITUDE SPACECRAFT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA SHEET DYNAMICS; CURRENT DISRUPTION; ISEE 1; EXPANSION; ONSET; MAGNETOTAIL; EVENT; MULTISATELLITE; PROPAGATION; CDAW-9 AB The substorm recovery phase typically commences approixmately 30 min after the substorm expansion phase onset and covers a period of roughly 1 hour. Several signatures have previously been associated with the recovery phase such as plasma sheet expansion in the midtail and magnetic field return toward the quiet time configuration. However, the detailed temporal sequence during the recovery phase is still not very well established. A total of 66 events in February-April 1979 have been investigated where ISEE 2 observed a plasma sheet expansion associated with fast earthward flows. Of these, 50 events were clearly associated with the substorm recovery phase as identified in ground magnetic records. For this data set, energetic electron (>30 keV), and proton (> 145 keV) observations from two geostationary spacecraft were available in 41 cases. Of the 41 cases, 32 of the midtail plasma sheet recoveries were associated with distinctive ion or electron flux increases at geostationary orbit. These flux increases, often in both protons and electrons, were generally observed from the predusk to the postdawn sector. However, very few enhancements were found near local noon. The lack of large energy dispersion in the flux increases and the simultaneous occurrence of both electron and ion enhancements suggests that the particles do not drift from a more distant location (as in substorm expansion phase onsets) but are accelerated or redistributed locally. These events are suggested to be associated with a large-scale reconfiguration of the near-Earth tail as the neutral line retreats to large distances. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. FINNISH METEOROL INST,DEPT GEOPHYS,SF-00101 HELSINKI,FINLAND. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Pulkkinen, Tuija/D-8403-2012 OI Pulkkinen, Tuija/0000-0002-6317-381X NR 37 TC 18 Z9 18 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 10967 EP 10979 DI 10.1029/93JA02719 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300003 ER PT J AU MCKEAN, ME WINSKE, D GARY, SP AF MCKEAN, ME WINSKE, D GARY, SP TI 2-DIMENSIONAL SIMULATIONS OF ION ANISOTROPY INSTABILITIES IN THE MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; HIGH-BETA-PLASMAS; MIRROR WAVES; CYCLOTRON INSTABILITY; SUBSOLAR MAGNETOSHEATH; DRIVEN; MAGNETOSPHERE; DOWNSTREAM; SHOCKS AB Ion populations with large perpendicular temperature anisotropies in the magnetosheath can excite both the mirror and proton cyclotron anisotropy instabilities. We compare kinetic aspects of these two instabilities using two-dimensional hybrid simulations, expanding upon an earlier work using one-dimensional simulations. Three simulation runs are examined: one in which the proton cyclotron instability has a higher linear growth rate, the second in which the mirror instability grows more rapidly, and the third in which the linear growth rates are identical. The last two runs include.,a large density of isotropic He++ ions to suppress the cyclotron instability. We find that initial growth occurs in all three runs at approximately the frequencies, wavenumbers, and obliquities expected by linear theory. As the system evolves, the power in both instabilities shifts to longer wavelength modes, and the characteristic frequency of the proton cyclotron instability decreases. In the first two runs, the instability with the larger linear growth rate dominates the wave energy at saturation, and in the third, the two instabilities contribute about equally. The proton cyclotron instability is relatively more important to wave-particle energy exchange than the mirror instability; its importance to proton isotropization is generally greater than that suggested by its contribution to the total wave energy, and it is almost solely responsible for heating the helium ions. C1 LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. NR 30 TC 50 Z9 50 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 11141 EP 11153 DI 10.1029/93JA03025 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300017 ER PT J AU HESSE, M WINSKE, D AF HESSE, M WINSKE, D TI HYBRID SIMULATIONS OF COLLISIONLESS RECONNECTION IN CURRENT SHEETS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID GENERAL MAGNETIC RECONNECTION; TEARING MODE; SIMULATIONS; INSTABILITY; PLASMAS; LINE AB Thin current sheets, with thicknesses of the order of a few ion gyroradii, are believed to exist quite commonly at the Earth's magnetopause as well as in the magnetotail current sheet just prior to substorm onset. Analytical theory predicts that sheets of this kind can become the locus of an ion-tearing instability. We use a modified hybrid simulation code that treats the ions fully kinetically and the electrons as a fluid with a model for the full pressure tensor to study the ion tearing mode development in one-dimensional current sheets of various thicknesses, with varying initial electron to ion temperature ratios. Further, we investigate the electron anisotropy dependence of the ion tearing mode growth rate and compare the growth rates found in the numerical simulations to linear growth rates for the pure ion-tearing instability derived from analytic theory. Estimates of the numerical accuracy of the simulations and of possible electron distribution functions resulting in the modeled anisotropies are also presented. C1 LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. RP HESSE, M (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ELECTRODYNAM BRANCH,GREENBELT,MD 20771, USA. RI Hesse, Michael/D-2031-2012 NR 44 TC 75 Z9 76 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 11177 EP 11192 DI 10.1029/94JA00676 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300019 ER PT J AU CHENG, CZ QIAN, Q AF CHENG, CZ QIAN, Q TI THEORY OF BALLOONING-MIRROR INSTABILITIES FOR ANISOTROPIC PRESSURE PLASMAS IN THE MAGNETOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID AXISYMMETRIC TOROIDAL PLASMAS; AZIMUTHAL WAVE NUMBER; HIGH-BETA-PLASMA; PC 5 WAVES; GEOSTATIONARY SATELLITES; KINETIC-THEORY; ULF PULSATION; STARE; ORBIT; PROPAGATION AB A kinetic-MHD eigenmode analysis of ballooning-mirror instabilities is performed for anisotropic pressure plasmas in the magnetosphere. The energetic particle kinetic effects and the coupling between the ballooning and mirror modes are taken into account. Without energetic trapped particle kinetic effects the ballooning-mirror modes with symmetric field-aligned structure of parallel perturbed magnetic field deltaB(parallel-to) and electrostatic potential PHI have lower beta instability threshold than the antisymmetric modes. Pressure anisotropy with (P(perpendicular-to)/P(parallel-to) > 1) reduces the beta threshold for ballooning-mirror instabilities. In the limit that the wave frequency is smaller than the energetic trapped particle magnetic drift frequency, the symmetric ballooning-mirror mode is completely stabilized by the energetic trapped particle kinetic effects. However, the antisymmetric ballooning-mirror mode is only weakly influenced by the energetic trapped particle kinetic effects and has the lowest beta threshold. For symmetric modes the energetic trapped particles experience a bounce-averaged wave structure due to their rapid bounce motion, and their nonadiabatic kinetic pressure response cancels with their fluid pressure response so that they do not contribute to the mode stability. Physically, the energetic trapped particles precess very rapidly across the B over arrow pointing right field, and their motion becomes very rigid with respect to low-frequency symmetric MHD perturbations. For antisymmetric modes the energetic trapped particle kinetic pressure response from the northern hemisphere cancels with that from the southern hemisphere in a bounce period, and thus the instability beta thresholds is mainly determined by t,he energetic particle fluid free energy. The field-aligned perturbed magnetic field structure of the antisymmetric mode changes from a ballooning mode with dominant transverse magnetic field components at P(perpendicular-to)/P(parallel-to) = 1 to a mixed ballooning-mirror mode with comparable transverse and compressional components near the equator as P(perpendicular-to)/P(parallel-to) increase. With large equatorial plasma beta (beta(parallel-to) greater-than-or-equal-to 0(1)) and pressure anisotropy (P(perpendicular-to)/P(parallel-to) > 1) the field-aligned wave structure of antisymmetric ballooning-mirror mode resembles the multisatellite observation of a long lasting compressional Pc 5 wave event during November 14-15, 1979 [Takahashi et al., 1987]. RP CHENG, CZ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 32 TC 51 Z9 52 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 11193 EP 11209 DI 10.1029/94JA00657 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300020 ER PT J AU DENTON, RE ANDERSON, BJ GARY, SP FUSELIER, SA AF DENTON, RE ANDERSON, BJ GARY, SP FUSELIER, SA TI BOUNDED ANISOTROPY FLUID MODEL FOR ION TEMPERATURES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; SUBSOLAR MAGNETOSHEATH; DAYSIDE MAGNETOPAUSE; INSTABILITIES; WAVES; SIMULATIONS AB A bounded anisotropy fluid model is developed which describes the temperature evolution of a collisionless plasma including the effect of pitch angle scattering due to ion cyclotron waves. The model equations accurately describe the proton temperature evolution in the plasma depletion layer, a magnetosheath regime of decreasing plasma density near the magnetopause. As in double adiabatic theory, changes in T(perpendicular-to) are driven by changes in flux the area A (is-proportional-to 1/B), while changes in T(parallel-to) are driven by changes in field line scale length L. In the bounded anisotropy model, if the proton temperature ratio T(perpendicular-to)/T(parallel-to) rises above the value 1 + 0.85 beta(parallel-to p)-0.48 (Anderson et al., 1994), where beta(parallel-to p) is the proton parallel beta, energy is transferred from the perpendicular to parallel temperature until this equation is satisfied. This energy exchange represents the effect of ion cyclotron wave pitch angle scattering, which keeps the plasma state near to marginal stability. Equations of the same form, employing bounded anisotropy expressions appropriate to different species, are also applied to He-2+ and to electrons. These equations well describe the evolution of the He-2+ but do not describe the evolution of the electron temperature, apparently due to the high electron thermal conduction which the model does not include. These results indicate that an energy exchange term may be incorporated into anisotropic fluid equations to simulate the effect of ion cyclotron wave pitch angle scattering in global fluid equations. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. RP DENTON, RE (reprint author), DARTMOUTH COLL,DEPT PHYS & ASTRON,6127 WILDER LAB,HANOVER,NH 03755, USA. RI Anderson, Brian/I-8615-2012 NR 28 TC 88 Z9 88 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 11225 EP 11241 DI 10.1029/94JA00272 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300022 ER PT J AU GARY, SP LEE, MA AF GARY, SP LEE, MA TI THE ION-CYCLOTRON ANISOTROPY INSTABILITY AND THE INVERSE CORRELATION BETWEEN PROTON ANISOTROPY AND PROTON-BETA SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; MAGNETOSHEATH; MIRROR; WAVES AB Magnetosheath observations have shown an inverse correlation between the proton temperature anisotropy and the parallel proton beta. Computer simulations have produced similar correlations and have demonstrated that they are due to wave-particle scattering by ion cyclotron anisotropy instabilities. Three derivations of this correlation in an electron/proton plasma yield physical insight into this relationship. C1 UNIV NEW HAMPSHIRE,INST STUDY EARTH OCEANS & SPACE,DURHAM,NH 03824. RP GARY, SP (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 18 TC 80 Z9 81 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 11297 EP 11301 DI 10.1029/94JA00253 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300027 ER PT J AU MOLDWIN, MB THOMSEN, MF BAME, SJ MCCOMAS, DJ MOORE, KR AF MOLDWIN, MB THOMSEN, MF BAME, SJ MCCOMAS, DJ MOORE, KR TI AN EXAMINATION OF THE STRUCTURE AND DYNAMICS OF THE OUTER PLASMASPHERE USING MULTIPLE GEOSYNCHRONOUS SATELLITES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MAGNETOSPHERIC PLASMA ANALYZER; DUSKSIDE BULGE; MORPHOLOGY; REGION; TROUGH; ORBIT AB The structure and the dynamics of the plasmaspheric bulge are examined using in situ three-dimensional plasma observations from magnetospheric plasma analyzers onboard multiple geosynchronous satellites, 'We identify the plasmasphere by the presence of high fluxes of low-energy (almost-equal-to few eV) ions (corresponding to densities of almost-equal-to 10s up to almost-equal-to 100 cm-3). The results from one year (1991) of nearly continuous plasma measurements from two longitudinally and latitudinally separated spacecraft are presented. This study corroborates many of the features and statistical behavior of the plasmaspheric bulge evidenced in past ground-based and single spacecraft data sets, except we often find a more complex outer plasmasphere than earlier studies have suggested. By using multipoint, simultaneous observations to separate spatial from temporal changes, this study extends previous examinations of the plasmasphere at synchronous orbit. We find that the width and location of the plasmaspheric bulge can differ significantly for the two spacecraft (separated by 6-8 hours in time), particularly during quiet geomagnetic conditions. The very different plasmaspheric morphologies seen by the two spacecraft lead us to conclude that the outer plasmasphere is often highly structured even during steady geomagnetic conditions and that the simple teardrop model of the bulge rarely, if ever, adequately describes the duskside plasmasphere. RP MOLDWIN, MB (reprint author), LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,SPACE & ATMOSPHER SCI GRP,LOS ALAMOS,NM 87545, USA. RI Moldwin, Mark/F-8785-2011 OI Moldwin, Mark/0000-0003-0954-1770 NR 27 TC 75 Z9 75 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1994 VL 99 IS A6 BP 11475 EP 11481 DI 10.1029/93JA03526 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NP993 UT WOS:A1994NP99300048 ER PT J AU LERNER, PB SOKOLOV, IM AF LERNER, PB SOKOLOV, IM TI THE MOBILITY OF NEGATIVE CHARGES IN LIQUID-HYDROGEN SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID HELIUM; SPECTRUM AB There is a great difference in behavior of e- in liquid hydrogen and helium despite the fact that the adopted theories of the mobility are quite similar. Recently, Levchenko and Mezhov-Deglin (Journal of Low Temperature Physics, 89, 457 (1992)) reported large discrepancies of the mobility of the electrons in liquid hydrogen from estimates based on the theory that the electrons are trapped in bubbles forming atomlike structures (''bubblonium''). They properly suggested that these deviations are related to the existence in liquid hydrogen of another, metastable type of negative charge carrier. The subject of the current paper is the physical explanation of the existence of two types of carriers in liquid hydrogen. We attribute the second type of carriers to the cluster ion H-(H-2)x, which is created by the formation of solid hydrogen around a bound state of a hydride ion. We provide estimates for the radius and the kinetics of degradation of the ''snowball'' formed around the H- ion on the basis of energy diagrams for a hydride ion submerged in liquid hydrogen. C1 UNIV FREIBURG,D-79104 FREIBURG,GERMANY. RP LERNER, PB (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. OI Lerner , Peter/0000-0002-3086-0170 NR 25 TC 3 Z9 3 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD JUN PY 1994 VL 95 IS 5-6 BP 683 EP 694 DI 10.1007/BF00754710 PG 12 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NR262 UT WOS:A1994NR26200001 ER PT J AU BEESABATHINA, DP SALAMANCARIBA, L MAO, SN XI, XX VENKATESAN, T WU, XD AF BEESABATHINA, DP SALAMANCARIBA, L MAO, SN XI, XX VENKATESAN, T WU, XD TI EFFECT OF SUBSTRATE MATERIALS ON LASER-DEPOSITED ND1.85CE0.15CUO4-Y FILMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID SUPERCONDUCTING THIN-FILMS; GROWTH; INTERFACES; ABLATION AB The growth morphology and interface structure of Nd1.85Ce0.15CuO4-y (NCCO) films grown by pulsed laser deposition on two different types of substrates, ''perovskite'' LaAlO3 (LAO) and SrTiO3 (STO) and ''fluorite'' Y2O3-stabilized ZrO2 (YSZ), were studied using cross-sectional electron microscopy. Structurally, the NCCO films are different when grown on the two types of substrates in three aspects: (i) epitaxy, (ii) substrate-film intermixing, and (iii) substrate-film interface roughness. In general, films deposited on ''fluorite'' substrates showed better superconducting properties than the films grown on ''perovskite'' substrates, especially for thinner films. Lattice mismatch considerations are not sufficient to explain the observed differences since films grown on the YSZ substrate showed sharp substrate-film interface in spite of their large lattice misfit. The atomic arrangements at the interface were analyzed in terms of electrostatic energy (charge balance) and matching of the oxygen sublattices in order to account for the experimental results. C1 UNIV MARYLAND,DEPT PHYS,CTR SUPERCOND RES,COLL PK,MD 20742. LOS ALAMOS NATL LAB,STC,LOS ALAMOS,NM 87545. RP BEESABATHINA, DP (reprint author), UNIV MARYLAND,DEPT MAT & NUCL ENGN,CTR SUPERCOND RES,COLL PK,MD 20742, USA. RI Salamanca-Riba, Lourdes/B-3785-2009; Venkatesan, Thirumalai/E-1667-2013 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403; NR 15 TC 4 Z9 4 U1 1 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1994 VL 9 IS 6 BP 1376 EP 1383 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA NN764 UT WOS:A1994NN76400008 ER PT J AU RABIN, BH WRIGHT, JK WRIGHT, RN SELLERS, CH AF RABIN, BH WRIGHT, JK WRIGHT, RN SELLERS, CH TI GRAIN-GROWTH BEHAVIOR IN FE3AL ALLOYS FABRICATED BY DIFFERENT METHODS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID COMPUTER-SIMULATION; IRON ALUMINIDES; MICROSTRUCTURE; CERAMICS; POWDERS; METALS AB Grain sizes were measured after various heat treatments in three Fe3Al alloys having similar composition that were fabricated using the techniques of ingot metallurgy (cast and wrought), hot extrusion of prealloyed powder, and hot isostatic pressing (HIP) of elemental powders. The ingot metallurgy (I/M) material exhibited normal grain growth behavior at temperatures above 750-degrees-C, in agreement with previous observations. Both powder metallurgy (P/M) materials displayed unusual resistance to grain growth compared to the I/M alloy. In the case of the prealloyed P/M material, the initial (recrystallized) grain size was larger than the initial grain size of the I/M material, although little grain growth was observed for heat-treatment temperatures up to 1100-degrees-C. At higher temperatures grain growth occurred at a rate comparable to that observed to the I/M alloy. The elemental powder P/M material exhibited similar grain growth behavior to the prealloyed P/M material, although the initial (as-HIPed) grain size was considerably smaller. Transmission electron microscopy (TEM) indicated that the grain growth resistance of the P/M materials could be attributed to grain boundary pinning by oxide particles presumed to originate from the powder particle surfaces. The difference in the stable grain size between the prealloyed and elemental powder P/M materials was attributed to the nature of the particle dispersions resulting from processing. RP RABIN, BH (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Wright, Jill/0000-0001-8909-8144 NR 31 TC 14 Z9 20 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1994 VL 9 IS 6 BP 1384 EP 1391 DI 10.1557/JMR.1994.1384 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA NN764 UT WOS:A1994NN76400009 ER PT J AU MARTINEZMIRANDA, LJ SANTIAGOAVILES, JJ GRAHAM, WR HEINEY, PA SIEGAL, MP AF MARTINEZMIRANDA, LJ SANTIAGOAVILES, JJ GRAHAM, WR HEINEY, PA SIEGAL, MP TI X-RAY STRUCTURAL STUDIES OF EPITAXIAL YTTRIUM SILICIDE ON SI(111) SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID 111 SILICON; DIFFRACTION AB We performed a series of glancing angle and reflection x-ray diffraction experiments to study both the in-plane and out-of-plane structure of epitaxial YSi2-x films grown on Si(111), with thicknesses ranging from 85 angstrom to 510 angstrom. These measurements allowed us to characterize the mean film lattice constants, the position correlation lengths of the film, and the presence and extent of strain as a function of film thickness. We find that the strain along the basal plane increases as a function of increasing thickness to approximately 1% in the 510 angstrom film; the corresponding out-of-plane strain is such that the film unit cell volume increases as a function of thickness. The corresponding in-plane microscopic strain varies from 0.5% for the 85 angstrom film to 0.3% for the 510 angstrom film. We relate our results to the mode of film growth and the presence of pinholes in the films. C1 UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP MARTINEZMIRANDA, LJ (reprint author), UNIV PENN,DEPT ELECT ENGN & MAT SCI & ENGN,PHILADELPHIA,PA 19104, USA. NR 16 TC 5 Z9 5 U1 1 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1994 VL 9 IS 6 BP 1434 EP 1440 DI 10.1557/JMR.1994.1434 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA NN764 UT WOS:A1994NN76400014 ER PT J AU MIRKARIMI, PB BARNETT, SA HUBBARD, KM JERVIS, TR HULTMAN, L AF MIRKARIMI, PB BARNETT, SA HUBBARD, KM JERVIS, TR HULTMAN, L TI STRUCTURE AND MECHANICAL-PROPERTIES OF EPITAXIAL TIN V0.3NB0.7N(100) SUPERLATTICES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ELASTIC-CONSTANTS; BRILLOUIN-SCATTERING; TIN; GROWTH; HARDNESS; FILMS; COATINGS; MODULUS; ZRN; HFN AB Epitaxial TiN/V0.3Nb0.7N superlattices with a 1.7% lattice mismatch between the layers were grown by reactive magnetron sputtering on MgO(001) substrates. Superlattice structure, crystalline perfection, composition modulation amplitudes, and coherency strains were studied using transmission electron microscopy and x-ray diffraction. Hardness H and elastic modulus were measured by nanoindentation. H increased rapidly with increasing LAMBDA, peaking at H values almost-equal-to 75% greater than rule-of-mixtures values at LAMBDA almost-equal-to 6 nm, before decreasing slightly with further increases in A. A comparison with previously studied lattice-matched TiN/V0.6Nb0.4N superlattices, which had nearly identical composition modulation amplitudes, showed a similar H variation, but a smaller H enhancement of almost-equal-to 50%. The results suggest that coherency strains, which were larger for the mismatched TiN/V0.3Nb0.7N superlattices, were responsible for the larger hardness enhancement. The results are discussed in terms of coherency strain theories developed for spinodally decomposed materials. Nanoindenter elastic modulus results showed no significant anomalies. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LINKOPING UNIV,DEPT PHYS,S-58183 LINKOPING,SWEDEN. RI Barnett, Scott/B-7502-2009 NR 46 TC 64 Z9 65 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1994 VL 9 IS 6 BP 1456 EP 1467 DI 10.1557/JMR.1994.1456 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA NN764 UT WOS:A1994NN76400017 ER PT J AU LEE, WY BESMANN, TM STOTT, MW AF LEE, WY BESMANN, TM STOTT, MW TI PREPARATION OF MOS2 THIN-FILMS BY CHEMICAL-VAPOR-DEPOSITION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID MOLYBDENUM SILICIDE; ORIENTATION; MECHANISMS AB The chemical vapor deposition (CVD) Of MoS2 by reaction of H2S with molybdenum halides was determined to be thermodynamically favored over a wide range of temperature, pressure, and precursor concentration conditions as long as excess H2S was available. The thermochemical stability of H2S, MoF6, and MoCl5 was also assessed to address their suitability as precursors for the CVD of MoS2. The results from the thermodynamic analysis were used as guidance in the deposition Of MoS2 thin films from MoF6 and H2S. The (002) basal planes Of MoS2 films deposited above 700 K were preferentially oriented perpendicular to the substrate surface. RP LEE, WY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 37 TC 31 Z9 31 U1 5 U2 74 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1994 VL 9 IS 6 BP 1474 EP 1483 DI 10.1557/JMR.1994.1474 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA NN764 UT WOS:A1994NN76400019 ER PT J AU WANG, ZL BENTLEY, J CLAUSING, RE HEATHERLY, L HORTON, LL AF WANG, ZL BENTLEY, J CLAUSING, RE HEATHERLY, L HORTON, LL TI DIRECT CORRELATION OF MICROTWIN DISTRIBUTION WITH GROWTH FACE MORPHOLOGY OF CVD DIAMOND FILMS BY A NOVEL TEM TECHNIQUE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; LOW-PRESSURE; THIN-FILMS AB A thick as-grown diamond film was examined directly by conventional transmission electron microscopy (TEM) without thinning, and the important microstructures near the growth surface were characterized. Specimen preparation for TEM involved simply fracturing the film; some of the diamond grains located on the specimen edge were thin enough to be directly examined by TEM. The 3-D topography of the diamond grains located at the intersection of the growth and the fracture surfaces was obtained using secondary electron images, so that the 2-D projected grain geometry could be derived easily to help interpret the TEM images. A diamond film grown with a [001] texture and having grains 2-3 mum diameter with {001} facets parallel to the substrate and four inclined {111} facets was examined. Grains with fracture surfaces that intersected the top (001) facet, grains with fractures that intersected only {111} facets, and unfractured grains were studied. It was found that the core volume bounded by the (001) top facet and its projected column defined by orthogonal internal {110} were free from microtwins, but contained a few dislocations. The remaining volume around this core, bounded by {111} facets (of grain boundaries) and the internal {110}, was filled with microtwins. The microtwins were not merely at the {111} surfaces. Our results reveal a growth mechanism in which microtwins are formed as material is added to {111} but not {001}. ne formation of microtwins in CVD diamond is thus clearly associated with growth on {111} surface facets. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 18 TC 23 Z9 23 U1 1 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1994 VL 9 IS 6 BP 1552 EP 1565 DI 10.1557/JMR.1994.1552 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA NN764 UT WOS:A1994NN76400028 ER PT J AU BINER, SB AF BINER, SB TI THE ROLE OF INTERFACES AND MATRIX VOID NUCLEATION MECHANISM ON THE DUCTILE FRACTURE PROCESS OF DISCONTINUOUS FIBER-REINFORCED COMPOSITES SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID METAL; DEFORMATION; GROWTH AB The role of fibre morphology, interface failure and void nucleation mechanisms within the matrix on the deformation and fracture behaviour of discontinuous fibre-reinforced composites was numerically investigated. The matrix was modelled using a constitutive relationship that accounts for strength degradation resulting from the nucleation and growth of voids. For the matrix, two materials exhibiting identical strength and ductility but having different void-nucleation mechanisms (stress-controlled and strain-controlled) were considered and fibres were assumed to be elastic. The debonding behaviour at the fibre interfaces was simulated in terms of a cohesive zone model which describes the decohesion by both normal and tangential separation. The results indicate that in the absence of interface failure, for a given fibre morphology the void nucleation in the matrix is the key controlling parameter of the composite strength and ductility, hence, of the fracture toughness. The weak interfacial behaviour between the fibres and the matrix can significantly increase the ductility without sacrificing strength for certain fibre morphology and for certain matrix void-nucleation mechanisms. RP BINER, SB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 26 TC 8 Z9 8 U1 0 U2 0 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 JUN 1 PY 1994 VL 29 IS 11 BP 2893 EP 2902 DI 10.1007/BF01117598 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA NU783 UT WOS:A1994NU78300011 ER PT J AU VAIDYA, RU XU, ZR LI, X CHAWLA, KK ZUREK, AK AF VAIDYA, RU XU, ZR LI, X CHAWLA, KK ZUREK, AK TI AGING RESPONSE AND MECHANICAL-PROPERTIES OF A SICP/AL-LI (8090) COMPOSITE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MATRIX COMPOSITES; PRECIPITATION; ALUMINUM; ALLOYS AB The ageing kinetics of a silicon carbide particle-reinforced Al-Li (8090) matrix composite and unreinforced' alloy, both made by spray forming, were investigated. Ageing treatments, without any straining after solutionizing, and with a 2% plastic strain after solutionizing, were employed. The peak ageing times of the matrix in the composite was shorter than that of the unreinforced alloy. The enhanced hardening rate of the matrix in the composite was attributed to the higher dislocation density induced as a result of the plastic deformation occurring at the particle/matrix interface. This plastic deformation is a result of the large difference in the coefficient of thermal expansion between the particles and matrix. Subjecting the samples to a 2% plastic strain reduced the peak ageing times even further. The tensile strength of the composite samples was marginally higher than that of the unreinforced alloy. Samples subjected to 2% plastic straining prior to ageing also exhibited higher strength values. The strain to failure of all the samples did not recover in the over-aged state. C1 NEW MEXICO INST MIN & TECHNOL,DEPT MAT SCI,SOCORRO,NM 87801. RP VAIDYA, RU (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 18 Z9 18 U1 0 U2 0 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 JUN 1 PY 1994 VL 29 IS 11 BP 2944 EP 2950 DI 10.1007/BF01117605 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA NU783 UT WOS:A1994NU78300018 ER PT J AU CHOU, TC NIEH, TG AF CHOU, TC NIEH, TG TI PEST DISINTEGRATION OF THIN MOSI2 FILMS BY OXIDATION AT 500-DEGREES-C SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID LOW-TEMPERATURE OXIDATION AB Thin molybdenum disilicide (MoSi2) films have been produced by magnetron sputter deposition, and subjected to oxidation tests for the study of ''MOSi2 pest'' - a phenomenon showing disintegration of a solid piece of MoSi2 into powdery products. The as-prepared films were of an amorphous structure. Oxidation of the films in air at 500-degrees-C led first to cracking of the films, and then the cracked pieces eventually evolved into disintegrated powders with a yellowish appearance. Secondary electron microscopy and Auger electron spectroscopy revealed that the reaction products consisted of MoO3 whiskers (platelets), Si-Mo-O fibres, SiO2 clusters, and some residual MOSi2. The disintegration of MOSi2 films appeared to be independent of their crystal structure; a similar phenomenon was also observed in crystallized films, with a metastable hexagonal structure, oxidized under the same conditions. The disintegration of the MoSi2 films is compared to and correlated with the ''pest reaction'' of bulk MoSi2. C1 LOCKHEED RES & DEV DIV,PALO ALTO,CA 94304. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 20 TC 10 Z9 10 U1 0 U2 5 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUN 1 PY 1994 VL 29 IS 11 BP 2963 EP 2967 DI 10.1007/BF01117608 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA NU783 UT WOS:A1994NU78300021 ER PT J AU HONG, SI GRAY, GT AF HONG, SI GRAY, GT TI DYNAMIC-MECHANICAL RESPONSE OF A 1060-AL/AL2O3 COMPOSITE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID BEHAVIOR; ALUMINUM; STRAIN; FLOW AB The flow stress of a 1060 Al/Al2O3 composite increases rapidly with strain rate due to the higher dislocation accumulation rate and the increasing strength of dislocation barriers. The Al/Al2O3 interfaces were found to be well bonded even after high-rate deformation of the composite. MgAl2O4 particles observed at Al/Al2O3 interfaces in the composite of the present study are thought to improve the interface strength. Unlike in pure aluminium, a well-developed cell structure was not observed in the deformed 1060 Al/Al2O3 composite. The absence of a well-developed cell structure is thought to result from a more homogeneous slip distribution in the composite. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 14 TC 18 Z9 19 U1 0 U2 1 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 JUN 1 PY 1994 VL 29 IS 11 BP 2987 EP 2992 DI 10.1007/BF01117611 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA NU783 UT WOS:A1994NU78300024 ER PT J AU PAULSEN, FG SHOJAIE, SS KRANTZ, WB AF PAULSEN, FG SHOJAIE, SS KRANTZ, WB TI EFFECT OF EVAPORATION STEP ON MACROVOID FORMATION IN WET-CAST POLYMERIC MEMBRANES SO JOURNAL OF MEMBRANE SCIENCE LA English DT Article DE MEMBRANE PREPARATION AND STRUCTURE; MICROPOROUS AND POROUS MEMBRANES; THEORY; MACROVOID FORMATION; CELLULOSE ACETATE ACETONE ID ASYMMETRIC MEMBRANES; MECHANISM AB A systematic study was carried out of the effect of the initial casting solution concentration, film thickness, and duration of the evaporation step on the occurrence and prominence of macrovoid pores in cellulose acetate membranes cast from acetone solutions via the dry/wet phase-inversion process. The duration of the evaporation step is shown to have a strong influence on macrovoid formation mainly through its influence on the solvent concentration gradient and casting solution viscosity at the instant of immersion into the precipitation bath. The results of this study are interpreted using predictive models for the evaporative casting process and for macrovoid formation. C1 UNIV COLORADO,DEPT CHEM ENGN,BOULDER,CO 80309. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RI Krantz, William/H-2291-2014 OI Krantz, William/0000-0002-3839-3968 NR 21 TC 83 Z9 88 U1 0 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0376-7388 J9 J MEMBRANE SCI JI J. Membr. Sci. PD JUN 1 PY 1994 VL 91 IS 3 BP 265 EP 282 DI 10.1016/0376-7388(94)80088-X PG 18 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA NT154 UT WOS:A1994NT15400005 ER PT J AU PAWEL, SJ AF PAWEL, SJ TI ROLE OF NITROGEN IN THE COVER GAS OVER MOLTEN LITHIUM HYDRIDE ON CORROSION OF TYPE 304L STAINLESS-STEEL CONTAINMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID LIQUID LITHIUM; RESISTANCE; CARBON AB Nitrogen contamination of the nominal argon-30% hydrogen cover gas over molten lithium hydride dramatically influences corrosion of type 304L stainless steel containment. Compared to 0% nitrogen, 15% nitrogen in the cover gas changes the primary corrosion mechanism from nickel leaching to chromium leaching and increases weight loss and intergranular penetration of 304L by at least an order of magnitude at 800-degrees-C. At 715-degrees-C, weight loss and intergranular penetration are about a factor of 3 greater than at 800-degrees-C for the 15% nitrogen cover gas. Cover gas contamination with 0.5% nitrogen accelerates weight loss about 15% compared to the nitrogen-free experiment at 800-degrees-C and the 304L containment material experiences nickel and chromium leaching. It was postulated that nitrogen and lithium penetrate grain boundaries to form a soluble precipitate incorporating chromium that accelerates corrosion in the presence of nitrogen. RP PAWEL, SJ (reprint author), OAK RIDGE Y-12 PLANT,DIV DEV,OAK RIDGE,TN 37831, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 1-2 BP 51 EP 62 DI 10.1016/0022-3115(94)90222-4 PG 12 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NP989 UT WOS:A1994NP98900008 ER PT J AU MARTZ, JC HASCHKE, JM STAKEBAKE, JL AF MARTZ, JC HASCHKE, JM STAKEBAKE, JL TI A MECHANISM FOR PLUTONIUM PYROPHORICITY SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID GENERALIZED-MODEL; SURFACE-REACTIONS; OXIDATION AB A proposed mechanism for plutonium pyrophoricity quantitatively predicts the ignition temperature of plutonium as a function of surface: mass ratio and particle size. Plutonium must exceed 475-degrees-C before self-ignition occurs. External heating of massive samples is necessary to achieve this condition, while finely divided materials can reach the ignition point by an alternative, two-step mechanism. First, the thin layer of surface PuO2 on the metal undergoes kinetically Controlled reduction to Pu2O3 near 150-degrees-C. Second, the trivalent Pu2O3 reacts with gas-phase oxygen to reform PuO2. Heat generated from the second reaction is sufficient to raise the temperature of small particles or thin foils above the 475-degrees-C ignition point. Details of this mechanism are given, including a discussion of plutonium oxidation and a calculation of adiabatic temperature increase due to oxidation of the Pu2O3 surface layer. Plutonium pyrophoricity data are summarized and compared to model results. C1 EG&G ROCKY FALTS,ROCKY FLATS PLANT,GOLDEN,CO 80402. RP MARTZ, JC (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,MS E506,LOS ALAMOS,NM 87544, USA. NR 48 TC 15 Z9 16 U1 1 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 1-2 BP 130 EP 142 DI 10.1016/0022-3115(94)90231-3 PG 13 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NP989 UT WOS:A1994NP98900017 ER PT J AU REST, J HOFMAN, GL AF REST, J HOFMAN, GL TI DYNAMICS OF IRRADIATION-INDUCED GRAIN SUBDIVISION AND SWELLING IN U3SI2 AND UO2 FUELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID HIGH BURNUP; RECRYSTALLIZATION; BEHAVIOR AB Observations on low-temperature swelling of irradiated uranium silicide dispersion fuels have shown that the growth of fission-gas bubbles is strongly affected by fission rate. The plot of swelling versus fuel burnup exhibits a distinct ''knee'' that shifts to higher fission density with increased fission rate. State-of-the-art models of fission-gas behavior do not predict such a dependence. Below the knee, no gas bubbles can be detected by scanning electron microscopy. Just at the knee, gas bubbles are seen to form in a heterogeneous fashion. Above the knee, the bubble population rapidly multiplies and the bubble size increases with fission density. ''Subdivision'' of the original grains has been observed in high-burnup uranium dioxide. In addition, the peripheral region of LWR fuel pellets reveals an increasingly porous microstructure with burnup. Observations of this ''rim effect'' show that an extremely fine-grained structure formed by subdivision of the original fuel grains is associated with the porous microstructure. The singular observation that gas-bubble swelling is strongly dependent on fission rate has led us to speculate that a dense network of subgrain boundaries forms in UO2 and U3Si2 at high burnup. Fission-gas bubbles nucleate at the newly formed boundaries and then grow at an accelerated rate relative to that of fission-gas bubbles in the bulk material. A theoretical formulation is presented wherein the stored energy in the material is concentrated on a network of sink-like nuclei that diminish with dose due to interaction with radiation-produced defects. Grain subdivision is induced when the energy per nucleus is high enough that the creation of grain-boundary surfaces is offset by the creation of strain-free volumes, with a resultant net decrease in the free energy of the material. This formulation, applied within the context of a mechanistic treatment of fission-gas-bubble behavior, is shown to provide a plausible interpretation of the observed phenomenon. RP REST, J (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. NR 36 TC 37 Z9 38 U1 4 U2 23 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 1-2 BP 187 EP 202 DI 10.1016/0022-3115(94)90237-2 PG 16 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NP989 UT WOS:A1994NP98900023 ER PT J AU FARRELL, K MAHMOOD, ST STOLLER, RE MANSUR, LK AF FARRELL, K MAHMOOD, ST STOLLER, RE MANSUR, LK TI AN EVALUATION OF LOW-TEMPERATURE RADIATION EMBRITTLEMENT MECHANISMS IN FERRITIC ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID PRESSURE-VESSEL STEELS; IRRADIATION; SPECTRUM; DAMAGE AB Investigations underway at Oak Ridge National Laboratory (ORNL) into reasons for the accelerated embrittlement of surveillance specimens of ferritic steels irradiated at 50-degrees-C at the High Flux Isotope Reactor (HFIR) pressure vessel are described. Originally, the major suspects for the precocious embrittlement were a highly thermalized neutron spectrum, a low displacement rate. and the impurities boron and copper. Each of these possibilities has been eliminated. A dosimetry experiment made at one of the major surveillance sites shows that the spectrum at that site is not thermalized. A new model of matrix hardening due to point defect clusters indicates little effect of displacement rate at low irradiation temperature. Boron levels are measured at 1 wppm or less, which is inadequate for embrittlement. Copper and nickel impurities are shown to promote radiation strengthening at high doses but not at the low doses pertinent to the surveillance data. It is shown that a copper embrittlement scenario has other drawbacks, and it is argued that copper impurity is not responsible for the accelerated embrittlement of the HFIR surveillance specimens. The dosimetry experiment revealed unexpectedly high levels of reaction products in some of the fast flux monitors, which are found to be caused by an exceptionally high ratio of gamma rav flux to fast neutron flux at the pressure vessel. Gamma rays can also induce atomic displacements, leading to the suggestion that the accelerated embrittlement may be provoked by gamma irradiation. RP FARRELL, K (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Stoller, Roger/H-4454-2011 NR 64 TC 29 Z9 29 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 3 BP 268 EP 281 DI 10.1016/0022-3115(94)90181-3 PG 14 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NV714 UT WOS:A1994NV71400006 ER PT J AU KATOH, Y STOLLER, RE KOHNO, Y KOHYAMA, A AF KATOH, Y STOLLER, RE KOHNO, Y KOHYAMA, A TI THE INFLUENCE OF HE DPA RATIO AND DISPLACEMENT RATE ON MICROSTRUCTURAL EVOLUTION - A COMPARISON OF THEORY AND EXPERIMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID CRITICAL RADIUS; ALLOYS; HELIUM; IRRADIATION; REACTORS AB A kinetic model was developed to investigate the influence of the displacement rate and helium generation rate on microstructural evolution in austenitic stainless steels. The model integrates the rate equations describing the evolution of point defects, small point defect clusters, helium-vacancy clusters. and the larger cavity size distribution that is responsible for observable swelling. Cavity (bubble) nucleation is accounted for by the helium-vacancy cluster evolution, while void formation occurs when bubbles grow beyond a critical size in the larger cavity distribution. A series of ion irradiation experiments were used to both calibrate the model and to provide a comparison between model predictions and experimental observations. The experiments involved single and dual-beam irradiations of solution annealed AISI-316 stainless steel at 873 K. The displacement rates were in the range of 2 X 10(-3) to 1 X 10(-2) dpa/s and the helium-to-dpa ratios were in the range of 0 to 50 appm He/dpa. The maximum displacement dose was 25 dpa. The experiments revealed a significant effect of helium on both the disLocation structure and the cavity distribution. The model predictions of helium effects over a broad range of He/dpa ratios and displacement rates were consistent with experimental observations. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KATOH, Y (reprint author), UNIV TOKYO,DEPT MAT SCI,7-13-1 HONGO,TOKYO 113,JAPAN. RI Stoller, Roger/H-4454-2011; OI Katoh, Yutai/0000-0001-9494-5862 NR 37 TC 22 Z9 22 U1 3 U2 19 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 3 BP 290 EP 302 DI 10.1016/0022-3115(94)90183-X PG 13 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NV714 UT WOS:A1994NV71400008 ER PT J AU ALLEN, WR AF ALLEN, WR TI THE LATTICE LOCATION OF HELIUM IMPLANTED IN ALPHA-SIC SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Methods of ion channeling analysis, employing backscattering spectrometry and the ion-induced He-3(d,p)He-4 nuclear reaction, were applied to specify a lattice site of high symmetry for helium in alpha-SiC. Single-crystal alpha-SiC, held at 300 K, was implanted with He-3+ at 75 keV. By considering the channeling angular distributions and the crystal structure, a probable position within the unit cell was qualitatively identified. Significant clustering and random positioning were not present. A single helium atom was centrally positioned in either a substitutional site or a tetrahedral interstitial site. Limitations upon the number of available low-index channeling directions prevented precise specification of the final lattice location. The availability of alpha-SiC with an orientation normal to the [0001] axis would allow the two identified possible locations for the helium to be distinguished. RP ALLEN, WR (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. NR 19 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 3 BP 318 EP 323 DI 10.1016/0022-3115(94)90185-6 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NV714 UT WOS:A1994NV71400010 ER PT J AU PELTON, AD TALLEY, PK LEIBOWITZ, L BLOMQUIST, RA AF PELTON, AD TALLEY, PK LEIBOWITZ, L BLOMQUIST, RA TI THERMODYNAMIC ANALYSIS OF PHASE-EQUILIBRIA IN THE IRON URANIUM ZIRCONIUM SYSTEM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Thermodynamic analysis of phase equilibria in metallic nuclear reactor systems has progressed to the study of the iron-uranium-zirconium ternary system. This work is based on our previous assessments and optimizations of the constituent binary subsystems iron-uranium, iron-zirconium, and uranium-zirconium. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. RP PELTON, AD (reprint author), ECOLE POLYTECH,CTR RECH CALCUL THERMOCHEM,SUCCURSALE A,MONTREAL H3C 3A7,QUEBEC,CANADA. NR 18 TC 6 Z9 6 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 3 BP 324 EP 332 DI 10.1016/0022-3115(94)90186-4 PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NV714 UT WOS:A1994NV71400011 ER PT J AU CAUSEY, RA CHRISMAN, WL CRAWFORD, J GAHL, JM AF CAUSEY, RA CHRISMAN, WL CRAWFORD, J GAHL, JM TI TRITIUM RETENTION IN TOKAMAK DISRUPTION-PRODUCED CARBON DEBRIS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP CAUSEY, RA (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1994 VL 210 IS 3 BP 333 EP 335 DI 10.1016/0022-3115(94)90187-2 PG 3 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NV714 UT WOS:A1994NV71400012 ER PT J AU PELUSO, MR SCHNEEMAN, BO AF PELUSO, MR SCHNEEMAN, BO TI A FOOD-GRADE SILICON DIOXIDE IS HYPOCHOLESTEROLEMIC IN THE DIET OF CHOLESTEROL-FED RATS SO JOURNAL OF NUTRITION LA English DT Article DE SILICA; CHOLESTEROL; RATS; BILE ACIDS; DIETARY FIBER ID BILE-ACIDS; LIPOPROTEINS; PLASMA; SERUM; FIBER; POLYSACCHARIDES; SECRETION; LIPIDS AB Silicon dioxide, commonly referred to as silica, is present in plant cell walls and interstitial spaces, and is often found as a component of dietary fibers that have exhibited hypocholesterolemic activity in animals. The primary objective of this study was to determine the cholesterolemic effects of two different morphological forms of silicon in the diet of cholesterol-fed rats. Male Wistar rats were provided diets containing 1 g cholesterol/100 g diet, and 0.65 g Si/100 g diet as either a sodium salt (silicate group) or silicon dioxide, a synthetic silica polymer (silica group). Cellulose was used as a control (control group). The in vitro bile acid binding capacity of the SiO2 was also measured. After 44 d of diet administration, animals were deprived of food for 24 h and then killed. Plasma total, VLDL, and LDL cholesterol concentrations were 18%, 29%, and 26% lower, respectively, in the silica group than in the control group. However, liver cholesterol concentrations were not different among dietary treatments. During the initial 15 d of the study, average daily total fecal bile acids were 38% higher in the silica group than in the control group, but fecal bile acid outputs were not different for the remainder of the experiment. The silica polymer used in the feeding trial was found to adsorb 5 times more cholate than chenodeoxycholate, at pH 7.5 in vitro. In vivo, the potential for silica to enhance fecal cholic acid excretion, relative to chenodeoxycholic acid during the initial stage of the study, may have contributed to the hypocholesterolemic response to the silica diet. It is further hypothesized that normalization of fecal bile acid levels in the silica group may have been due to an adaptation response that involved changes in the spectrum of bile acids in the enterohepatic pool. C1 LAWRENCE LIVERMORE NATL LAB,DEPT NUTR,DAVIS,CA 95616. NR 35 TC 11 Z9 11 U1 0 U2 5 PU AMER INST NUTRITION PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-3166 J9 J NUTR JI J. Nutr. PD JUN PY 1994 VL 124 IS 6 BP 853 EP 860 PG 8 WC Nutrition & Dietetics SC Nutrition & Dietetics GA NP543 UT WOS:A1994NP54300011 PM 8207542 ER PT J AU BATSCHE, K ASHBY, CR LEE, C SCHWARTZ, J WANG, RY AF BATSCHE, K ASHBY, CR LEE, C SCHWARTZ, J WANG, RY TI THE BEHAVIORAL-EFFECTS OF THE STEREOISOMERS OF 4-METHYLAMINOREX, A PSYCHOSTIMULANT, IN THE RAT SO JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS LA English DT Article ID DISCRIMINATIVE STIMULUS PROPERTIES; DOPAMINE RECEPTOR SUBTYPES; D-AMPHETAMINE; PLACE PREFERENCE; ANTAGONISTS; SEROTONIN; AGONISTS; HYPERACTIVITY; LOCOMOTOR; NEURONS AB In this study, we examined the effect of the isomers of the psychostimulant 2-amino-4-methyl-5-phenyl-triangle(2)-oxazoline (4-methylaminorex or 4-MAX) on behavior in rats. The s.c. administration of the stereoisomers of 4-MAX, trans-4S,5S, cis-4R,5S, cis-4S,5R and trans-4R,5R (0.3-3 mg/kg), produced a dose-dependent increase in locomotor activity. However, at a dose of 10 mg/kg, the isomers of 4-MAX produced an initial increase in locomotor activity followed by the appearance of stereotyped behaviors (continuous sniffing, chewing, head bobbing, etc.) then a subsequent phase of rebound-enhanced locomotor activity all over a time course of 4 hr. The rank order of potency for the stereoisomers of 4-MAX was: 4S,5S > 4R,5S = 4S,5R < 4R,5R. To determine what neurotransmitter systems may mediate the action of 4-MAX, the ability of various receptor antagonists to block or attenuate the effect of trans-4S,5S-4-MAX (3 mg/kg s.c.) on locomotor activity was examined. The selective dopamine (DA) D-1 antagonist (-)-trans-6,7,7a,8,9,13b-hexahydro-3-chloro-2-hydroxy-N-methyl-5H-benzo-[d]naph-thio[2,1b]azepine (SCH 39166) and the D-2 receptor antagonist (-)-eticlopride significantly attenuated the behavioral action of trans-4S,5S-4-MAX, whereas antagonists to serotonergic and adrenergic receptors were ineffective. These results suggest that the ability of 4S,5S-4-MAX to induce locomotor hyperactivity and stereotypical behaviors and to increase rearing durations is primarily mediated by DA receptors. To determine whether the action of 4-MAX is dependent upon 5-hydroxytryptamine or DA concentrations in nerve terminals, rats were pretreated with either reserpine, alpha-methyl-p-tyrosine or d,l-p-chlorophenyalanine. Both reserpine and alpha-methyl-p-tyrosine pretreatment markedly attenuated the locomotor activity produced by trans-4S,5S-4-MAX. Moreover, L-dopa partially reversed the inhibitory action of amethyl-p-tyrosine on 4S,5S-4-MAX-induced behavioral activation. In contrast, the administration of d,l-p-chlorophenylalanine did not alter the behavioral responses produced by trans-4S,5S-4-MAX. Taken together, our results suggest that 4-MAX may increase several locomotor behaviors by inducing neuronal DA release, which subsequently interacts with dopaminergic receptors. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. SUNY STONY BROOK,DEPT PSYCHOL,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. FU NIDA NIH HHS [R01 DA 07193, F31 DA 05532]; NIMH NIH HHS [R01 MH41440] NR 48 TC 8 Z9 8 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-3565 J9 J PHARMACOL EXP THER JI J. Pharmacol. Exp. Ther. PD JUN PY 1994 VL 269 IS 3 BP 1029 EP 1039 PG 11 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA PB548 UT WOS:A1994PB54800019 PM 7912274 ER PT J AU SELLERS, CH HYDE, TA OBRIEN, TK WRIGHT, RN AF SELLERS, CH HYDE, TA OBRIEN, TK WRIGHT, RN TI PHASE-TRANSFORMATIONS IN FE3AL+TI ALLOYS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE IRON ALUMINIDES; FE3AL; ELECTRICAL PROPERTIES; MAGNETIC PROPERTIES; DO3; B2 ID FE-AL ALLOYS; ELECTRICAL-RESISTIVITY; IRON ALUMINIDES; MOLYBDENUM; MICROSTRUCTURE; SUBSTITUTION; ADDITIONS; TITANIUM; SILICON AB A series of ternary alloys has been prepared by adding Ti to a nonstoichiometric Fe3Al composition. The effect of these additions on the phase structure has been determined using microscopic, magnetic and electrical techniques. For small additions of Ti, there is an increase in the DO3 <-- --> B2 transition temperature without gross changes in the microstructure or the ordering processes. Additional Ti substitutions result first in the development of a two phase microstructure (alpha + DO3) and then in the precipitation of Fe2Ti at grain boundaries and within grain interiors. RP SELLERS, CH (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 29 TC 15 Z9 16 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD JUN PY 1994 VL 55 IS 6 BP 505 EP 515 DI 10.1016/0022-3697(94)90156-2 PG 11 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA NT647 UT WOS:A1994NT64700008 ER PT J AU BU, HH CHEN, EQ XU, SY GUO, KX WUNDERLICH, B AF BU, HH CHEN, EQ XU, SY GUO, KX WUNDERLICH, B TI SINGLE-MOLECULE SINGLE-CRYSTALS OF ISOTACTIC POLYSTYRENE SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLYSTYRENE; SINGLE MOLECULE CRYSTAL; MOLECULAR MASS DISTRIBUTION ID LATTICE AB Single-molecule single crystals were grown from amorphous droplets of fractionated isotactic polystyrene. The crystals were analyzed by electron microscopy and electron diffraction. The molecular mass distribution could be matched with a statistical analysis of single-molecule particles (amorphous and crystals). Proof was brought that single molecules of isotactic polystyrene do not reach equilibrium dimensions on crystallization, rather assume the lamellar morphology with chain-folded macroconformation, also known from crystallization of polymolecular crystals. (C) 1994 John Wiley & Sons, Inc.* C1 ACAD SINICA,BEIJING LAB ELECTR MICROSCOPY,BEIJING 100080,PEOPLES R CHINA. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP BU, HH (reprint author), FUDAN UNIV,DEPT MAT SCI,SHANGHAI 200433,PEOPLES R CHINA. NR 12 TC 34 Z9 43 U1 0 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD JUN PY 1994 VL 32 IS 8 BP 1351 EP 1357 DI 10.1002/polb.1994.090320806 PG 7 WC Polymer Science SC Polymer Science GA NM081 UT WOS:A1994NM08100006 ER PT J AU SAFRONOVA, UI NILSEN, J AF SAFRONOVA, UI NILSEN, J TI AUTOIONIZATION STATES OF LITHIUM-LIKE IONS WITH LARGE PRINCIPAL QUANTUM NUMBER SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID DIELECTRONIC SATELLITE SPECTRA; HELIUM-LIKE IONS; 3-ELECTRON ATOMIC SYSTEMS; Z-DEPENDENCES; ENERGY-LEVELS; ELECTRON-SYSTEMS; EXCITED-STATES; RATES; HE AB The energy levels of the 1s2lnl' (n = 3 and 4) configurations for ions with Z between 10 and 54 were calculated by using two theoretical methods: the perturbation theory method using Z-expansion (MZ) and the multiconfiguration Dirac-Fock method (MCDF). The asymptotic dependence of the energy matrix of the 1s2lnl' states on the principal quantum number n is discussed. Comparison between the two theoretical methods are given for the 1s2l3l' and 1s2l4l' configurations. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RUSSIAN ACAD SCI,INST SPECTROSCOPY,TROITSK 142092,RUSSIA. NR 34 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD JUN PY 1994 VL 51 IS 6 BP 853 EP 874 DI 10.1016/0022-4073(94)90017-5 PG 22 WC Optics; Spectroscopy SC Optics; Spectroscopy GA NU134 UT WOS:A1994NU13400006 ER PT J AU BOWER, K ANGEL, A GIBSON, R ROBINSON, T KNOBELOCH, D SMITH, B AF BOWER, K ANGEL, A GIBSON, R ROBINSON, T KNOBELOCH, D SMITH, B TI ALPHA-BETA DISCRIMINATION LIQUID SCINTILLATION-COUNTING FOR URANIUM AND ITS DAUGHTERS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article AB Advances in liqiud scintillation counting (LSC)technologies, such as improved scintillation cocktail formulations and alpha-beta radiation discrimination. make LSC suitable for applications in uranium process chemistry. Ease of use, low cost, and the huge dynamic range of LSC are distinct advantages for analytical support of actinide processing. All uranium isotopes decay primarily with alpha radiation emission. The immediate short-lived daughters of U-238 are Th-234 and Pa-234. These nuclides are beta emitters having energy bands that overlap the uranium bands in a liquid scintillation spectrum. The resolution of these overlapping bands hy alpha-beta radiation discrimination is useful for uranium quantification and purity verification. Protactinium-234 is a high-energy beta emitter that can be further identified and quantified from it's Cherenkov radiation. Energy spectra were collected on the Packard 2500AB liquid scintillator analyzer for uranyl solutions in diisopropylnaphthalene and pseudocumene based scintillator cocktails. Calibration curves were prepared for nitric, hydrochloric, and sulfuric acid media. Base titrations demonstrated the effect of acid quenching on those system. Ion exchange and water soluble polymer extraction studies are readily followed using liquid scintillation methods. RP BOWER, K (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD JUN PY 1994 VL 181 IS 1 BP 97 EP 107 DI 10.1007/BF02037551 PG 11 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA PE936 UT WOS:A1994PE93600010 ER PT J AU LYON, WS AF LYON, WS TI ANALYTICALLY SPEAKING SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-LETTERS LA English DT Article RP LYON, WS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 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 JUN 1 PY 1994 VL 187 IS 3 BP 169 EP 173 DI 10.1007/BF02166502 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA NR265 UT WOS:A1994NR26500001 ER PT J AU NARAYANAN, VA STOKES, DL VO-DINH, T AF NARAYANAN, VA STOKES, DL VO-DINH, T TI VIBRATIONAL SPECTRAL-ANALYSIS OF EOSIN-Y AND ERYTHROSIN-B - INTENSITY STUDIES FOR QUANTITATIVE DETECTION OF THE DYES SO JOURNAL OF RAMAN SPECTROSCOPY LA English DT Article ID ENHANCED RAMAN ANALYSIS; P-AMINOBENZOIC ACID; SILVER ELECTRODE; SURFACE; PYRIDINE AB The complete vibrational spectra of Eosin Y and Erythrosin B were recorded using Fourier transform Raman and Fourier transform infrared spectroscopy. The surface-enhanced Raman scattering (SERS) spectra of these two dyes were also studied using an intensified charge-coupled detector (ICCD) Raman spectrophotometer operated with 5 mW laser power. The intensities of the intense alternating C-C bond wavenumbers of the aromatic ring at 1333 cm-1 in Eosin Y and 1317 cm-1 in Erythrosin B were measured as a function of the analyte concentration of these dyes. Calibration graphs of concentration of the dyes in ethanol solution against photon counts are presented. The limits of detection of these two bands in the SERS spectra were determined. RP NARAYANAN, VA (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 38 TC 18 Z9 18 U1 1 U2 22 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 1994 VL 25 IS 6 BP 415 EP 422 DI 10.1002/jrs.1250250607 PG 8 WC Spectroscopy SC Spectroscopy GA NT342 UT WOS:A1994NT34200006 ER PT J AU CUSHMAN, JH HU, XL GINN, TR AF CUSHMAN, JH HU, XL GINN, TR TI NONEQUILIBRIUM STATISTICAL-MECHANICS OF PREASYMPTOTIC DISPERSION SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article DE PREASYMPTOTIC; DISPERSION; NONEQUILIBRIUM; POROUS MEDIUM; HETEROGENEITY ID HETEROGENEOUS POROUS-MEDIA; SOLUTE TRANSPORT; VELOCITY; DIFFUSION; SCALES; MODEL AB Turbulent transport in bulk-phase fluids and transport in porous media with fractal character involve fluctuations on all space and time scales. Consequently one anticipates constitutive theories should be nonlocal in character and involve constitutive parameters with arbitrary wavevector and frequency dependence. We provide here a nonequilibrium statistical mechanical theory of transport which involves both diffusive and convective mixing (dispersion) at all scales. The theory is based on a generalization of classical approaches used in molecular hydrodynamics and on time-correlation functions defined in terms of nonequilibrium expectations. The resulting constitutive laws are nonlocal and constitutive parameters are wavevector and frequency dependent. All results reduce to their convolution-Fickian, quasi-Fickian, or Fickian counterparts in the appropriate limits. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP PURDUE UNIV, 1150 LILLY HALL, W LAFAYETTE, IN 47907 USA. NR 21 TC 91 Z9 91 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-4715 EI 1572-9613 J9 J STAT PHYS JI J. Stat. Phys. PD JUN PY 1994 VL 75 IS 5-6 BP 859 EP 878 DI 10.1007/BF02186747 PG 20 WC Physics, Mathematical SC Physics GA NX388 UT WOS:A1994NX38800005 ER PT J AU SCHRIEFFER, JR BALATSKY, AV ABRAHAMS, E SCALAPINO, DJ AF SCHRIEFFER, JR BALATSKY, AV ABRAHAMS, E SCALAPINO, DJ TI ODD FREQUENCY PAIRING IN SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article ID SINGLET SUPERCONDUCTORS AB The properties of a superconductor having an energy gap function DELTA(k)(omega(n)) which is an odd function of frequency omega(n), or time, are investigated. One finds (a) the allowed pair orbital angular momenta for spin zero and spin one are interchanged, permitting S = 0, l = 1 and S = 1, l = 0 condensates; (b) there exists an equal-time order parameter corresponding to condensation of a spin wave coupled to two fermions, in contrast to the conventional time-reversed fermion pair condensate; an explicit energy gap equation is derived for this composite operator condensate; (c) the coherence factors are shown to be reversed from those of conventional pairing, for omega > 2DELTA, removing the peak in the a + C conductivity sigma(omega) and generating a peak in the omega > 2DELTA acoustic attenuation as a function of temperature; (d) the Josephson current vanishes between an even and odd frequency superconductor, and vanishes to leading order in the tunneling rates approximately t12(2) C1 FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32308. LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08855. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. RP SCHRIEFFER, JR (reprint author), FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32308, USA. NR 5 TC 8 Z9 8 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1994 VL 7 IS 3 BP 501 EP 504 DI 10.1007/BF00728448 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM852 UT WOS:A1994NM85200001 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI SYMMETRY, MECHANISM OF THE PAIRING, AND THE ISOTOPE EFFECT IN THE CUPRATES SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE ORDER-PARAMETER SYMMETRY; ISOTOPE EFFECT; PHONON MECHANISM; CUPRATES ID SUPERCONDUCTING STATE; YBA2CU3O7-DELTA; ANISOTROPY; TC AB This paper is concerned mainly with the problem of the origin of high T(c). s-Wave vs. d-wave pairing, the isotope effect, and the strong coupling of the carriers to low-frequency optical phonon modes are discussed. This latter strong coupling is sufficient to provide high T(c). C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 30 TC 14 Z9 14 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1994 VL 7 IS 3 BP 531 EP 535 DI 10.1007/BF00728454 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM852 UT WOS:A1994NM85200007 ER PT J AU LEVIN, K ZHA, Y RADTKE, RJ SI, Q NORMAN, MR SCHUTTLER, HB AF LEVIN, K ZHA, Y RADTKE, RJ SI, Q NORMAN, MR SCHUTTLER, HB TI SPIN DYNAMICS AND IMPLICATIONS FOR SUPERCONDUCTIVITY - SOME PROBLEMS WITH THE D-WAVE SCENARIO SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SPIN DYNAMICS; D-WAVE PAIRING; ELIASHBERG THEORY; HIGH-TEMPERATURE SUPERCONDUCTORS; IMPURITIES ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; FLUCTUATION-INDUCED SUPERCONDUCTIVITY; NEUTRON-SCATTERING; FERMI-LIQUID; COPPER OXIDES; RELAXATION RATE; STATE; YBA2CU3O7; LA2-XSRXCUO4; NMR AB We review the spin dynamics of the normal state of the cuprates with special emphasis on neutron data in both the YBa2Cu3O7-delta and La2-xSrCuO4 systems. When realistic models of the Fermi surface shapes are incorporated, along with a moderate degree of spin fluctuations, we find good semiquantitative agreement with experiment for both cuprates. Building on the success of this Fermi-liquid-based scheme, we explore the implications for d-wave pairing from a number of vantage points. We conclude that our present experimental and theoretical understanding is inadequate to confirm or refute the d-wave scenario. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08855. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV GEORGIA,DEPT PHYS & ASTRON,ATHENS,GA 30602. RP LEVIN, K (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. RI Norman, Michael/C-3644-2013 NR 40 TC 9 Z9 9 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1994 VL 7 IS 3 BP 563 EP 570 DI 10.1007/BF00728460 PG 8 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM852 UT WOS:A1994NM85200014 ER PT J AU DYKES, JW KLAVINS, P LAN, MD LIU, JZ SHELTON, RN AF DYKES, JW KLAVINS, P LAN, MD LIU, JZ SHELTON, RN TI PRODUCTION OF SINGLE-CRYSTAL K3C60 SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE FULLERIDE; K3C60; SINGLE CRYSTAL; SYNTHESIS ID TRANSPORT AB A simplified technique for synthesizing high-quality millimeter-sized single-crystals of K3C60 is reported. The preparation method consists of a two-step process where pure C60 crystals are first grown and later doped with potassium vapor. The undoped crystals are grown using an open-tube vapor transport with a flowing helium gas carrier. Doping occurs in a high-vacuum environment inside a specialized quartz tube which allows phase purity to be monitored via magnetization measurements of the superconducting state. Utilizing the aforementioned procedure, one can attain samples with magnetically determined superconducting transition widths (10-90% diamagnetic shielding) of less than 1 K. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP DYKES, JW (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1994 VL 7 IS 3 BP 635 EP 637 DI 10.1007/BF00728475 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM852 UT WOS:A1994NM85200028 ER PT J AU ZETTL, A LU, L XIANG, XD HOU, JG VAREKA, WA FUHRER, MS AF ZETTL, A LU, L XIANG, XD HOU, JG VAREKA, WA FUHRER, MS TI NORMAL-STATE TRANSPORT-PROPERTIES OF FULLERENE SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE ALKALI-METAL-DOPED FULLERENES; NORMAL-STATE TRANSPORT; SUPERCONDUCTIVITY ID SINGLE-CRYSTAL K3C60 AB The normal-state transport properties of alkali-metal-doped fullerene crystals are explored. The Hall effect has been measured in KxC60 from room temperature to T(c). The electrical resistivity rho for K3C60 and Rb3C60 has been measured over a wide temperature range (20-650 K), and notable differences are observed for the materials at both low and high temperatures. The electrical resistivity of Rb3C60 has been measured in hydrostatic pressures up to 9 kbar. The resistivity is highly pressure sensitive. The transport results give an insight into the normal-state conduction mechanism and thus have consequences for the superconductivity mechanism. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP ZETTL, A (reprint author), LAWRENCE BERKELEY LAB,DEPT PHYS,BERKELEY,CA 94720, USA. RI Fuhrer, Michael/E-7634-2010; Hou, Jianguo/G-5076-2010; Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016 OI Fuhrer, Michael/0000-0001-6183-2773; Zettl, Alex/0000-0001-6330-136X NR 5 TC 5 Z9 5 U1 0 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1994 VL 7 IS 3 BP 639 EP 642 DI 10.1007/BF00728476 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM852 UT WOS:A1994NM85200029 ER PT J AU WARD, WC SWIFT, GW AF WARD, WC SWIFT, GW TI DESIGN ENVIRONMENT FOR LOW-AMPLITUDE THERMOACOUSTIC ENGINES [43.35.UD, 43.20.MV] SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Note AB In thermoacoustic engines, and in many simple acoustic systems, a one-dimensional wave equation determines the spatial dependence of the acoustic pressure and velocity. Design Environment for Lour-amplitude Thermoacoustic Engines (DELTAE) is a computer program that integrates such wave equations in the acoustic approximation, in gases or liquids, in user-defined geometries. Boundary conditions can include conventional acoustic boundary conditions of geometry and impedance, as well os temperature and thermal power in thermoacoustic systems, and voltage and current in electroacoustic systems. DELTAE can be used easily for apparatus ranging from simple duct networks and resonators to thermoacoustic prime movers, refrigerators, and combinations thereof It can predict how a given apparatus will perform, or can allow the user to design an apparatus to achieve desired performance. DELTAE is now available to the public. RP WARD, WC (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 9 TC 122 Z9 148 U1 7 U2 26 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1994 VL 95 IS 6 BP 3671 EP 3672 DI 10.1121/1.409938 PG 2 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NR920 UT WOS:A1994NR92000069 ER PT J AU BUTT, DP WANTUCK, PJ SAPPEY, AD AF BUTT, DP WANTUCK, PJ SAPPEY, AD TI LASER DIAGNOSTICS OF ZIRCONIUM CARBIDE VAPORIZATION SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article AB Laser diagnostic methods are developed to study the behavior of laser-ablated zirconium carbide (ZrC). The optical emission spectra from the Zr-C plasma plume is measured from 200 to 500 nm. Emission from zirconium atoms dominated the observed spectra. From the spectra, the average plasma temperature was estimated to be 10500 +/- 1500 K. Plume formation is characterized using a CCD camera to capture emission at delay times (with respect to the ablation laser pulse) ranging from 1 mus to 1 ms and using planar laser-induced fluorescence to map Zr atom distributions. C1 LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. RP BUTT, DP (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. RI Butt, Darryl/B-7480-2008 OI Butt, Darryl/0000-0003-4501-8864 NR 13 TC 3 Z9 4 U1 2 U2 3 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 1994 VL 77 IS 6 BP 1411 EP 1417 DI 10.1111/j.1151-2916.1994.tb09737.x PG 7 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900001 ER PT J AU KIRKPATRICK, KS MASON, TO BALACHANDRAN, U POEPPEL, RB AF KIRKPATRICK, KS MASON, TO BALACHANDRAN, U POEPPEL, RB TI IMPEDANCE SPECTROSCOPY STUDY OF SINTERING IN BI-DOPED ZNO SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID ZINC-OXIDE VARISTOR; ZNO-BI2O3 CERAMICS; TEMPERATURE; FREQUENCY; SPECTRA; POWDER AB Solid- and liquid-state sintering kinetics in the (1 - x)ZnO-xBi2O3 system with 0 less-than-or-equal-to x less-than-or-equal-to 0.05 over the range 600 less-than-or-equal-to T(degrees-C) less-than-or-equal-to 1100 were investigated by impedance spectroscopy. Compositions with x < 0.002 retarded sintering, whereas compositions with x greater-than-or-equal-to 0.004 accelerated sintering above the eutectic temperature of 740-degrees-C. The results could be interpreted in terms of limited solid solubility of Bi2O3 in ZnO (x congruent-to 0.004 +/- 0.002), solid-state sintering in the subsolidus, and liquid-state sintering above the solidus. A phase diagram for the ZnO-rich end of the system is proposed, based on these results. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. RP KIRKPATRICK, KS (reprint author), NORTHWESTERN UNIV,MCCORMICK SCH ENGN & APPL SCI,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Mason, Thomas/B-7528-2009 NR 35 TC 10 Z9 10 U1 0 U2 5 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 1994 VL 77 IS 6 BP 1493 EP 1498 DI 10.1111/j.1151-2916.1994.tb09747.x PG 6 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900011 ER PT J AU WANG, XL HUBBARD, CR ALEXANDER, KB BECHER, PF FERNANDEZBACA, JA SPOONER, S AF WANG, XL HUBBARD, CR ALEXANDER, KB BECHER, PF FERNANDEZBACA, JA SPOONER, S TI NEUTRON-DIFFRACTION MEASUREMENTS OF THE RESIDUAL-STRESSES IN AL2O3-ZRO2 (CEO2) CERAMIC COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID THERMAL-EXPANSION ANISOTROPY; TETRAGONAL ZIRCONIA; FRACTURE-TOUGHNESS; POWDER DIFFRACTION; RIETVELD METHOD; TRANSFORMATION; ZRO2; TEMPERATURE; REFINEMENT; BEHAVIOR AB High-resolution neutron powder diffraction was used to study the residual stresses in Al2O3-ZrO2 (12 mol% CeO2) ceramic composites containing 10, 20, and 40 vol% ZrO2 (CeO2). The diffraction data were analyzed using the Rietveld structure refinement technique. The analysis shows that for all samples, the CeO2-stabilized tetragonal ZrO2 particles are in tension and the Al2O3 matrix is in compression. For both the ZrO2 Particles and the Al2O3 matrix, the average lattice strains are anisotropic and increase approximately linearly with a decrease in the corresponding phase content. It is shown that these features can be qualitatively understood by taking into consideration' the thermal expansion mismatch between the ZrO2 and Al2O3 grains. Also, for all composite samples, the diffraction peaks are broader than the instrumental resolution, indicating that the strains in these samples are inhomogeneous. From an analysis of the refined peak shape parameters, the average root-mean-square strain, which describes the distribution of the inhomogeneous strain field, was determined. Finally, the average residual stresses were evaluated from the experimentally determined average lattice strains and compared with recent results of X-ray measurements on similar composites. C1 OAK RIDGE NATL LAB,DEPT SOLID STATE,OAK RIDGE,TN 37831. RP WANG, XL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Wang, Xun-Li/C-9636-2010; Fernandez-Baca, Jaime/C-3984-2014 OI Wang, Xun-Li/0000-0003-4060-8777; Fernandez-Baca, Jaime/0000-0001-9080-5096 NR 33 TC 27 Z9 28 U1 1 U2 3 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 1994 VL 77 IS 6 BP 1569 EP 1575 DI 10.1111/j.1151-2916.1994.tb09758.x PG 7 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900022 ER PT J AU VARMA, HK MANI, TV DAMODARAN, AD WARRIER, KG AF VARMA, HK MANI, TV DAMODARAN, AD WARRIER, KG TI CHARACTERISTICS OF ALUMINA POWDERS PREPARED BY SPRAY OF BOEHMITE SOL SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID ZIRCONIA POWDERS; GEL; TECHNOLOGY; CERAMICS; GLASS AB Boehmite sol prepared from aluminum nitrate has been spray-dried to obtain micrometer-size spherical particles consisting of submicrometer crystallites. The spray-dried powder was further washed with solvents of varying polarities such as acetone, 2-propanol, and 2-methyl-2-propanol. Particle-size distribution, morphology, density, compaction, and sintering characteristics of powders wash ed with different solvents are reported. The effect of posttreatments on the boehmite-sol-derived powders toward reducing agglomeration and obtaining high-density bodies is discussed. C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP VARMA, HK (reprint author), CSIR,REG RES LAB,THIRUVANANTHAPURAM 69510,INDIA. RI TVM, NIIST/E-5132-2012 OI TVM, NIIST/0000-0002-5814-466X NR 21 TC 44 Z9 45 U1 2 U2 7 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 1994 VL 77 IS 6 BP 1597 EP 1600 DI 10.1111/j.1151-2916.1994.tb09762.x PG 4 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900026 ER PT J AU TUNABOYLU, B MCKITTRICK, J NELLIS, WJ NUTT, SR AF TUNABOYLU, B MCKITTRICK, J NELLIS, WJ NUTT, SR TI DYNAMIC COMPACTION OF AL2O3-ZRO2 COMPOSITIONS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SHOCK COMPACTION; PHASE-DIAGRAM; ZIRCONIA; ALUMINA; POWDER; ZRO2 AB Shock compaction of Al2Os-ZrO2 binary and ternary powder compositions resulted in dense, one-piece samples without visible cracks for pressures less-than-or-equal-to 12.6 GPa. Dynamic pressures were achieved by using a 6.5-m-long two-stage gas gun. It is believed that plastic deformation by dislocation slip of alpha-Al2O3 partially accommodates the tensile stresses created during the release-of shock pressures. A fine and narrow particle size distribution is necessary to achieve high bulk densities, but the bulk structural integrity was not strongly related to the distribution. A high-pressure phase of ZrO2, which was formed from the monoclinic polymorph, was found at and above shock pressure of 6.3 GPa. No evidence of the orthorhombic cotunnite structure was observed. Compaction of glassy and submicrocrystalline rapidly solidified starting materials showed good structural integrity, although the bulk density was relatively low. It is not clear what the densification/bonding mechanism is in these materials, although it appears not to be plastic deformation. Microstructural analysis showed that fine and uniform microstructures are retained after compaction at appropriate dynamic pressures for all compositions, with some interparticle cohesion present. C1 LAWRENCE LIVERMORE NATL LAB, INST GEOPHYS & PLANETARY PHYS, LIVERMORE, CA 94550 USA. LAWRENCE LIVERMORE NATL LAB, DIV H, LIVERMORE, CA 94550 USA. UNIV SO CALIF, DEPT MAT SCI & ENGN, LOS ANGELES, CA 90089 USA. RP TUNABOYLU, B (reprint author), UNIV CALIF SAN DIEGO, MAT SCI PROGRAM, LA JOLLA, CA 92093 USA. NR 31 TC 5 Z9 5 U1 1 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0002-7820 EI 1551-2916 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1994 VL 77 IS 6 BP 1605 EP 1612 DI 10.1111/j.1151-2916.1994.tb09764.x PG 8 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900028 ER PT J AU BAMBERGER, CE HAVERLOCK, TJ KOPP, OC AF BAMBERGER, CE HAVERLOCK, TJ KOPP, OC TI SYNTHESIS AND CHARACTERIZATION OF SR2CE2TI5O16 IN THE SYSTEM SRO-CEO2-TIO2 SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note AB The ternary system SrO-CeO2-TiO2 was investigated using X-ray diffractometry. The formation of a new compound, Sr2Ce2Ti5O16, was established, and its compatibilities with SrO, SrCeO3, and SrTiO3 were studied. The results revealed the existence of a series of compounds Sr6-12xCe6xTi5O16 and solid solutions Sr2+nCe2Ti5+nO16+3n (n less-than-or-equal-to 6). RP BAMBERGER, CE (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 3 TC 16 Z9 16 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1994 VL 77 IS 6 BP 1659 EP 1661 DI 10.1111/j.1151-2916.1994.tb09772.x PG 3 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900036 ER PT J AU OHJI, T DEJONGHE, LC AF OHJI, T DEJONGHE, LC TI PRESINTERING HEAT-TREATMENT, DENSIFICATION, AND MECHANICAL-PROPERTIES OF SILICON-CARBIDE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID COMPACTS; ALPHA AB Silicon carbides were subjected to extended heat treatments at 1400-degrees or 1600-degrees-C prior to a 1-h isochronal sintering at 2000-degrees-C in argon, and the resulting microstructures, final densities, and room-temperature four-point bend strengths were compared to those of samples prepared without the pretreatments. The samples heat-treated at 1600-degrees-C exhibited higher relative densities and flexure strengths. Microstructural observation revealed that the heat treatment at 1600-degrees-C modified the initial powder compact microstructure, decreasing the development of large. dense domains in the early and intermediate sintering stages. This evolution was considered to promote a more uniform subsequent densification. The final size and distribution of the grains as well as of the pores were found to be affected favorablv by the pretreatment. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP OHJI, T (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 12 TC 6 Z9 6 U1 1 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 1994 VL 77 IS 6 BP 1685 EP 1687 DI 10.1111/j.1151-2916.1994.tb09780.x PG 3 WC Materials Science, Ceramics SC Materials Science GA NT179 UT WOS:A1994NT17900044 ER PT J AU KLINGLER, RJ RATHKE, JW AF KLINGLER, RJ RATHKE, JW TI HIGH-PRESSURE NMR INVESTIGATION OF HYDROGEN-ATOM TRANSFER AND RELATED DYNAMIC PROCESSES IN OXO CATALYSIS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID TRANSITION-METAL HYDRIDES; SUPERCRITICAL CARBON-DIOXIDE; DICOBALT OCTACARBONYL; DIMANGANESE DECACARBONYL; REDUCTIVE ELIMINATION; THERMAL-DECOMPOSITION; QUADRUPOLAR NUCLEI; BOND-DISSOCIATION; HYDROFORMYLATION; MECHANISM AB The cobalt center in H Co(CO)(4) exchanges with those in Co-2(CO)(8) through a facile hydride ligand transfer reaction which has been studied by Co-59 NMR line-shape analysis over the temperature range of 80 to 200 degrees C and total system pressures up to 370 atm in supercritical carbon dioxide. The lifetime of the cobalt center in HCo(CO)(4) varies from 2 ms at 80 degrees C to 10 mu s at 200 degrees C, exhibiting an activation energy of 15.3 +/- 0.4 kcal/mol. The hydride ligand transfer process is highly specific for the HCo(CO)(4) and Co-2(CO)(8) complexe(s). Thus, neither Co-4(CO)(12) nor MnCo(CO)(9) exhibit measurable chemical exchange line broadening in the Co-59 NMR spectra within solutions where the resonances for HCo(CO)(4) and Co-2(CO)(8) coalesce. In addition, the full peak widths at half-height (W-1/2) for the hydride, dihydrogen, and water resonances vary by less than 3 Hz in the H-1 NMR spectra, while the line widths (W-1/2) for the HCo(CO)(4) and Co-2(CO)(8) resonances broaden by more than 15 000 Hz in the Co-59 NMR spectra. A similar hydride ligand transfer reaction exchanges the hydride moieties in HCo(CO)(4) and HMn(CO)(5). This latter heterometallic hydride ligand transfer reaction has been investigated by H-1 NMR line-width analysis over the temperature range of 110 to 190 degrees C at two initial carbon monoxide concentrations, 1.39 and 4.13 M. The lifetime of the hydride moiety on the manganese center in the heterometallic hydride ligand transfer reaction between HCo(CO)(4) and HMn(CO)(5) is independent of the carbon monoxide pressure and exhibits an activation energy of 19 +/- 1 kcal/mol. The Mn-55 NMR spectra indicate no measurable exchange (less than 30 transfers per second) between the manganese centers in HMn(CO)(5), MnCo(CO)(9), and Mn-2(CO)(10) under the same reaction conditions, where the hydride moieties in HMn(CO)(5) and HCo(CO)(4) are undergoing facile exchange (greater than 10(4) transfers per second) as evident in the H-1 NMR spectra. This lack of measurable exchange between the manganese centers in HMn(CO)(5), MnCo(CO)(9), and Mn-2-(CO)(10) is inconsistent with an oxidative addition reaction mechanism for the heterometallic hydride ligand transfer reaction. Alternatively, the kinetics of these hydride ligand transfer reactions are interpreted in terms of a hydrogen atom transfer reaction mechanism involving Co-.(CO)(4) and .Mn(CO)(5) radicals. Thus, the degenerate hydrogen atom transfer reaction between HCo(CO)(4) and Co-.(CO)(4) proceeds with activation parameters of Delta H-double dagger = 5.5 +/- 0.6 kcal/mol and Delta S-double dagger = -16 +/- 1 cal/(K.mol), while the endothermic hydrogen atom transfer from manganese in HMn(CO)(5) to cobalt in Co-.(CO)(4) exhibits an activation enthalpy of 10 +/- 1 kal/mol. In addition, the kinetics for the ligand exchange reaction between the coordinated carbonyl groups in Co-2(CO)(8) and free carbon monoxide has been studied in mesitylene solvent by C-13 NMR line-shape analysis over the temperature range of 100 to 180 degrees C under 8.2 M of carbon monoxide. In this temperature range, the free carbon monoxide ligand exhibits a strongly temperature-dependent chemical shift in the presence of Co-2(5CO)(8). This temperature-dependent (CO)-C-13 chemical shift is interpreted as a contact chemical shift due to facile ligand exchange with Co-.(CO)(4) radicals. The resultant analysis of the contact chemical shift data yields a calculated Co-Co bond dissociation enthalpy (BDE) of 19 +/- 2 kcal/mol. The magnetic susceptibility of a solution of Co-2(CO)(8) in carbon monoxide has been studied by H-1 NMR spectroscopy over the temperature range of 120 to 225 degrees C, consistently yielding an enthalpy and entropy for Co-CO bond homolysis of Delta H degrees = 19 +/- 2 kcal/mol and Delta S degrees = 29 +/- 4 cal/(K.mol). This Co-Co BDE when used in combination with the enthalpy of hydrogenation for Co-2(CO)(8) yields a Co-H BDE in HCo(CO)(4) of 59 +/- 1 kcal/mol. Consistently, the activation enthalpy for hydrogen atom transfer in the HCo(CO)(4)/Co-.(CO)(4) system is between 5 and 10% of the measured Co-H bond enthalpy (Delta H-double dagger/BDE = 0.093) in agreement with the theory for atom transfer reactions developed by Marcus. RP KLINGLER, RJ (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 98 TC 68 Z9 69 U1 0 U2 9 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 JUN 1 PY 1994 VL 116 IS 11 BP 4772 EP 4785 DI 10.1021/ja00090a025 PG 14 WC Chemistry, Multidisciplinary SC Chemistry GA NQ723 UT WOS:A1994NQ72300025 ER PT J AU KVAM, PH SAMANIEGO, FJ AF KVAM, PH SAMANIEGO, FJ TI NONPARAMETRIC MAXIMUM-LIKELIHOOD-ESTIMATION BASED ON RANKED SET SAMPLES SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Article DE CONSISTENCY; EM ALGORITHM; LIFE TESTING; ORDER STATISTICS ID DOUBLY CENSORED-DATA; SURVIVAL FUNCTION; INCOMPLETE DATA; EM ALGORITHM; CONVERGENCE; CONSISTENCY AB A ranked set sample consists entirely of independently distributed order statistics and can occur naturally in many experimental settings, including problems in reliability. When each ranked set from which an order statistic is drawn is of the same size, and when the statistic of each fixed order is sampled the same number of times, the ranked set sample is said to be balanced. Stokes and Sager have shown that the edf F(n) of a balanced ranked set sample from the cdf F is an unbiased estimator of F and is more precise than the edf of a simple random sample of the same size. The nonparametric maximum likelihood estimator (MLE) F* of F is studied in this article. Its existence and uniqueness is demonstrated, and a general numerical procedure is presented and is shown to converge to F*. If the ranked set sample is balanced, it is shown that the EM algorithm, with F(n) as a seed, converges to the unique solution (F*) of the problem's self-consistency equations; the consistency of every iterate of the EM algorithm is also demonstrated. The modifications needed to obtain similar results in unbalanced cases are also discussed. Finally, the results of a simulation study are reported, which support the claim that the nonparametric maximum likelihood estimator, as approximated by an appropriate iterate of the EM algorithm, performs well in the unbalanced case where F(n) is inapplicable and performs better than F(n) in balanced cases where both estimators exist and can be compared. C1 UNIV CALIF DAVIS,DIV STAT,DAVIS,CA 95616. RP KVAM, PH (reprint author), LOS ALAMOS NATL LAB,GRP A1,LOS ALAMOS,NM 87544, USA. NR 17 TC 53 Z9 53 U1 0 U2 3 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD JUN PY 1994 VL 89 IS 426 BP 526 EP 537 DI 10.2307/2290855 PG 12 WC Statistics & Probability SC Mathematics GA NN155 UT WOS:A1994NN15500025 ER PT J AU SUTIJA, DP MULLER, RH TOBIAS, CW AF SUTIJA, DP MULLER, RH TOBIAS, CW TI ON THE EMERGENCE AND SPACING OF ZINC STRIATIONS .1. DETERMINATION OF PREFERRED STRIATION FREQUENCY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID FLOW VISUALIZATION; ELECTRODEPOSITION AB Profiles normal to the flow direction were analyzed with Fourier transforms and autocorrelation to determine the preferred wavelength of striated zinc electrodeposits formed in flowing acid electrolytes. Striation frequency increases with current density to a minimum separation between striae of approximately 150 mum. At higher current densities, independent of substrate, striae meld and form a smoother nodular deposit. At a given current density, emerging striae possess a higher frequency when deposition occurs on substrates with high growth-center density. Independent control of growth-center spacing by the use of micropatterned electrodes equipped with artificial micron-size hemispherical protrusions triggers the emergence of thin striae earlier and extends the current density range over which they occur. A causal relationship between the density of growth centers and striation emergence is demonstrated. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 22 TC 3 Z9 3 U1 1 U2 2 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 1994 VL 141 IS 6 BP 1477 EP 1483 DI 10.1149/1.2054949 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NQ338 UT WOS:A1994NQ33800017 ER PT J AU MANSOUR, AN MELENDRES, CA PANKUCH, M BRIZZOLARA, RA AF MANSOUR, AN MELENDRES, CA PANKUCH, M BRIZZOLARA, RA TI X-RAY-ABSORPTION FINE-STRUCTURE SPECTRA AND THE OXIDATION-STATE OF NICKEL IN SOME OF ITS OXYCOMPOUNDS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID OXIDE ELECTRODE AB XANES spectra of nickel K-edge and x-ray diffraction patterns of several nickel oxycompounds were measured. The shift in energy of the Ni K-absorption edge toward higher values correlates well with the increase in the oxidation state of nickel from +2 to +4 in the compounds studied. The inflection point energy of the Ni pre-edge structure shifts approximately 1 eV per unit change in valency. Our results provide evidence which supports the assignment that the valency of Ni in beta-NiOOH is +3; Ni3O2(OH)4 and commercial nickel peroxide (NiO2) likewise contain trivalent nickel. The edge shift for quadrivalent nickel in KNilO6 is reported for the first time. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP MANSOUR, AN (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 11 TC 45 Z9 45 U1 2 U2 18 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 1994 VL 141 IS 6 BP L69 EP L71 DI 10.1149/1.2054990 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NQ338 UT WOS:A1994NQ33800004 ER PT J AU CLEAR, R AF CLEAR, R TI THE HOLOR REPRESENTATION OF POLARIZATION - DISCUSSION SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Note RP CLEAR, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 17 EP 18 PG 2 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700007 ER PT J AU BERMAN, SM BULLIMORE, MA JACOBS, RJ BAILEY, IL GANDHI, N AF BERMAN, SM BULLIMORE, MA JACOBS, RJ BAILEY, IL GANDHI, N TI AN OBJECTIVE-MEASURE OF DISCOMFORT GLARE SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article AB Although it is relatively easy to perceive and report the sensation of discomfort caused by the presence of an offending light source of high luminance, no one has yet found a reliable objective correlate of discomfort glare. In order to find an objectively measured correlate of discomfort glare, we have examined electrical activity associated with the two major facial muscles that surround the eye: the orbicularis oculi and the corrugator supercilii. We have made electromyographic (EMG) recordings using small silver-silver chloride electrodes applied to the skin above the muscles and measured electrical potentials while changing lighting glare conditions. Intensities varied over a range of glare luminance determined by a separate procedure according to subjective ratings. For this subjective method, subjects indicated the level of discomfort by marking a visual analog scale (VAS) punctuated with four descriptions of discomfort level: perceptible, annoying, disturbing, and intolerable. We have determined that the VAS is much more reliable with much less variability than the previously used border between comfort and discomfort (BCD) method. For 20 subjects, discomfort glare was assessed under three conditions: 2-degree-diameter glare source with low room illumination, 2-degree glare source with medium room illumination, and 1-degree glare source with medium room illumination. The glare source was a projector beam, 11 degrees to the right of a fixation target on a video monitor. Six different glare luminance levels were presented for 2-s periods. Each glare level was presented six times in a randomized order giving 36 presentations. EMG responses were subjected to Fourier analysis and the power frequency spectrum was determined with appropriate digital filtering used to eliminate powerline artifacts. Blinking causes an artifact whose power spectrum is markedly different and can be determined independently of the glare source. The integrated power spectrum of the EMG activity during exposure to the glare source was compared to the same integral prior to exposure to obtain a quantitative measure of glare-induced activity. For each of the 19 subjects and a variety of glare conditions, the objective measure and the VAS have been plotted as a function of glare luminance. For individual subjects we found increasing objective measure and increasing subjective discomfort with increased glare luminance. We conclude that the EMG technique is a valid, objective means of assessing discomfort glare. RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. OI Jacobs, Robert/0000-0001-6709-1785 NR 0 TC 36 Z9 36 U1 1 U2 7 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 40 EP 48 PG 9 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700023 ER PT J AU BERMAN, SM BULLIMORE, MA JACOBS, RJ BAILEY, IL GANDHI, N AF BERMAN, SM BULLIMORE, MA JACOBS, RJ BAILEY, IL GANDHI, N TI AN OBJECTIVE-MEASURE OF DISCOMFORT GLARE - REPLY SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Note RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 49 EP 49 PG 1 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700025 ER PT J AU CLEAR, R AF CLEAR, R TI THE VERTICAL-TO-HORIZONTAL ILLUMINANCE RATIO - A NEW INDICATOR OF DAYLIGHTING PERFORMANCE - DISCUSSION SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Note RP CLEAR, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 59 EP 60 PG 2 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700027 ER PT J AU BERMAN, SM FEIN, G JEWETT, DL ASHFORD, F AF BERMAN, SM FEIN, G JEWETT, DL ASHFORD, F TI LANDOLT-C RECOGNITION IN ELDERLY SUBJECTS IS AFFECTED BY SCOTOPIC INTENSITY OF SURROUND ILLUMINANTS SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article AB In a previous study of young adults age 20-40, we demonstrated that low-contrast Landolt-C recognition was better with smaller pupils than with larger pupils even though task retinal illuminance was higher for larger pupils. Pupil size in these studies was controlled by the spectrum of the far surround illumination, which was prevented from affecting task luminance. The present study used the same procedures as our previous study with seven healthy elderly adult subjects between the ages of 61 and 66. Because senile miosis is a characteristic of the aging eye, spectral changes in the surround might be expected to produce relatively smaller changes in pupil size and hence performance. Although the.scotopically enhanced surround lighting produced relatively smaller pupil size changes than in young adults, the performance enhancements were surprisingly comparable to those of young adults. As in the previous study, the task was recognition of the orientation of the gap in the C that was presented on a CRT with contrasts varying from 18-80 percent. Two surround illuminants were compared, both provided a luminance of 53 cd/m2 on the front wall at visual angles larger than 30 degrees. Subjects had at least 20/20 vision and performed the task with their spectacles if normally used. RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 0 TC 21 Z9 21 U1 1 U2 4 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 123 EP 128 PG 6 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700056 ER PT J AU BERMAN, SM FEIN, G JEWETT, DL ASHFORD, F AF BERMAN, SM FEIN, G JEWETT, DL ASHFORD, F TI LANDOLT-C RECOGNITION IN ELDERLY SUBJECTS IS AFFECTED BY SCOTOPIC INTENSITY OF SURROUND ILLUMINANTS - REPLY SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Note RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 129 EP 130 PG 2 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700059 ER PT J AU CLEAR, R BERMAN, S AF CLEAR, R BERMAN, S TI ENVIRONMENTAL AND HEALTH-ASPECTS OF LIGHTING - MERCURY SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article AB Most discharge lamps, including fluorescent lamps, metal halide lamps, and high pressure sodium lamps, contain mercury, a toxic chemical. Lighting professionals need to be able to respond to questions about the direct hazards of mercury from accidentally breaking lamps, and the potential environmental hazards of lamp operation and disposal. We calculated the exposures that could occur from an accidental breakage of lamps. Acute poisoning appears almost impossible. Under some circumstances a sealed environment, such as a space station, could be contaminated enough to make it unhealthy for long-term occupation. Mercury becomes a potential environmental hazard after it becomes methylated. Mercury is methylated in aquatic environments, where it may accumulate in fish, eventually rendering them toxic to people and other animals. Lighting causes mercury to enter the environment directly from lamp disposal and indirectly from power plant emissions. The environmental tradeoffs between incandescent and discharge lamps depend upon the amounts released by these two sources, their local concentrations, and the probabilities of their being methylated. Indirect environmental effects of lighting also include the release of other heavy metals (cadmium, lead, and arsenic) and other air pollutants and carbon dioxide emitted by fossil-fuel power plants. For a given light output, the level of power-plant emissions depends upon the efficacy of the light source, and is thus much larger for incandescent lamps than for fluorescent or discharge lamps. As disposal and control technologies change, the relative direct and indirect emissions from discharge and incandescent lamps will change. RP CLEAR, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 8 Z9 8 U1 0 U2 4 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 138 EP 152 PG 15 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700065 ER PT J AU CLEAR, R BERMAN, S AF CLEAR, R BERMAN, S TI ENVIRONMENTAL AND HEALTH-ASPECTS OF LIGHTING - MERCURY - REPLY SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Note RP CLEAR, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1994 VL 23 IS 2 BP 154 EP 156 PG 3 WC Optics SC Optics GA NW827 UT WOS:A1994NW82700070 ER PT J AU NAPOLITANO, GE HILL, WR GUCKERT, JB STEWART, AJ NOLD, SC WHITE, DC AF NAPOLITANO, GE HILL, WR GUCKERT, JB STEWART, AJ NOLD, SC WHITE, DC TI CHANGES IN PERIPHYTON FATTY-ACID COMPOSITION IN CHLORINE-POLLUTED STREAMS SO JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY LA English DT Article DE PERIPHYTON; FATTY ACIDS; LIPIDS; STREAM BIOLOGICAL MONITORING; WATER QUALITY; CHLOROPHYLL AB A manipulative experiment was conducted to evaluate a biochemical method for using periphyton in water quality assessment. Periphyton assemblages that developed in situ on ceramic tiles placed in a reference site in one stream were transferred into a reference site and a polluted site in each of three streams in eastern Tennessee. Samples of periphyton from each site were analyzed for chlorophyll a content, rate of photosynthesis (by ''C uptake), and fatty acid composition, 3, 17, and 35 days after being transferred to the sites. Chlorophyll a and photosynthetic rates per unit of chlorophyll at polluted sites were generally lower than at corresponding reference sites. More than 50 different fatty acids were separated and identified in the periphyton phospholipids; 12 of the 50 accounted for more than 90% of the total fatty acids. Periphyton fatty-acid biomarkers revealed differences in the periphyton taxonomic composition between reference and polluted sites. Fatty acid profiles indicated a shift from diatom to green alga-dominated assemblages in reference and chlorine contaminated sites respectively. Individual fatty-acid biomarkers specific for green algae (18:3omega3 or alpha-linolenic acid) and diatoms (20:5omega3 or eicosapentaenoic acid) proved particularly useful in quantifying the periphyton response to chlorine. The use of algal signature fatty acids may evolve into a quantitative automated method for measuring chlorine effect on stream periphyton. RP NAPOLITANO, GE (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. OI stewart, arthur/0000-0003-1968-5997 NR 0 TC 27 Z9 27 U1 1 U2 10 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 1994 VL 13 IS 2 BP 237 EP 249 DI 10.2307/1467242 PG 13 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA NT887 UT WOS:A1994NT88700011 ER PT J AU LOEHLE, C AF LOEHLE, C TI HOME RANGES RECONSIDERED - REPLY SO LANDSCAPE ECOLOGY LA English DT Note DE TERRITORIALITY; FRACTALS; MINIMUM CONVEX POLYGON RP LOEHLE, C (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU S P B ACADEMIC PUBLISHING BV PI LELYSTAD PA PLATINASTRAAT 33, 8211 AR LELYSTAD, NETHERLANDS SN 0921-2973 J9 LANDSCAPE ECOL JI Landsc. Ecol. PD JUN PY 1994 VL 9 IS 2 BP 147 EP 149 PG 3 WC Ecology; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA NU094 UT WOS:A1994NU09400007 ER PT J AU RUNGE, FE KENT, MS YU, H AF RUNGE, FE KENT, MS YU, H TI CAPILLARY WAVE INVESTIGATION OF SURFACE-FILMS OF DIBLOCK COPOLYMERS ON AN ORGANIC SUBPHASE - POLY(DIMETHYLSILOXANE) - POLY(STYRENE) FILMS AT THE AIR ETHYL BENZOATE INTERFACE SO LANGMUIR LA English DT Article ID LIGHT-SCATTERING; WATER-INTERFACE; POLYMER; MONOLAYERS; VISCOELASTICITY; TENSION; LAYERS AB The surface film viscoelastic properties of poly(dimethylsiloxane) (PDMS) homopolymers and several poly(dimethylsiloxane)-poly(styrene) (PDMS-PS) diblock copolymers at the air/ethyl benzoate (A/EB) interface have been examined by surface quasi-elastic light scattering (SLS) as a function of surface pressure, II, determined with the Wilhelmy plate technique. All systems used in this study form stable, but to some extent, soluble monolayers at A/EB. The advantage of SLS is that it gives reliable dynamic film elasticities and viscosities even in a situation where the static elasticities cannot be determined by standard methods. Relative to the values for PDMS homopolymers at the same II, increases in both the surface dilational elastiCitY, epsilon(d), and the corresponding viscosity, kappa, for the diblock copolymers are observed for all copolymer samples. The deviations occur at much lower surface pressures for the asymmetric copolymers (higher PS content) than for a nearly symmetric sample. This suggests that the symmetric sample interacts mainly via the surface PDMS blocks, while the highly asymmetric samples interact mainly through the submerged PS blocks. The magnitudes of epsilon(d) and kappa for the copolymers obtained in this study are consistent with the picture of relatively flexible, submerged PS blocks. C1 UNIV WISCONSIN,DEPT CHEM,MADISON,WI 53706. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 34 TC 21 Z9 22 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1994 VL 10 IS 6 BP 1962 EP 1970 DI 10.1021/la00018a056 PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NT580 UT WOS:A1994NT58000056 ER PT J AU BURTON, HD AF BURTON, HD TI THE PRIVATE LIVES OF EINSTEIN,ALBERT - HIGHFIELD,R, CARTER,P SO LIBRARY JOURNAL LA English DT Book Review RP BURTON, HD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BOWKER MAGAZINE GROUP CAHNERS MAGAZINE DIVISION PI NEW YORK PA 249 W 17TH ST, NEW YORK, NY 10011 SN 0363-0277 J9 LIBR J JI Libr. J. PD JUN 1 PY 1994 VL 119 IS 10 BP 120 EP & PG 0 WC Information Science & Library Science SC Information Science & Library Science GA NN211 UT WOS:A1994NN21100096 ER PT J AU LEE, SH KEMP, PF AF LEE, SH KEMP, PF TI SINGLE-CELL RNA-CONTENT OF NATURAL MARINE PLANKTONIC BACTERIA MEASURED BY HYBRIDIZATION WITH MULTIPLE 16S RIBOSOMAL-RNA-TARGETED FLUORESCENT-PROBES SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Article ID RIBOSOMAL-RNA; GROWTH-RATE; OLIGONUCLEOTIDE PROBES; PHYLOGENETIC ANALYSIS; BACTERIOPLANKTON; IDENTIFICATION; DNA; COMMUNITY; SEA; MICROORGANISMS AB Despite the potential of cellular RNA as a tool for the study of bacterial activities in natural environments, cellular RNA has rarely been measured because of methodological limitations. In a previous study, we quantitatively analyzed single-cell RNA content with multiple 16S rRNA-targeted fluorescent probes. In the present study, we explore the potential of this approach with 12 samples of natural planktonic bacteria collected from coastal water over a 6-month period (late winter to summer). We measured fluorescence from single cells hybridized with multiple probes, cellular DNA and RNA by ethidium bromide (EtBr) fluorometry, and [H-3]thymidine (TdR) incorporation rates. Fluorescence of the probe-hybridized cells was highly correlated to cellular RNA determined by EtBr fluorometry. Winter and summer samples showed different patterns of fluorescence-frequency distribution. Temperature had a large positive effect on TdR incorporation rates, but there was a negative correlation with cellular RNA content; only the samples taken at elevated summer temperatures showed a positive relationship between TdR incorporation and cellular RNA content. We estimated that the RNA content of the cells not visibly labeled with five probes was <0.3 fg. C1 BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973. RI Kemp, Paul/G-2291-2011 OI Kemp, Paul/0000-0001-8947-4349 NR 33 TC 71 Z9 71 U1 0 U2 9 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 1994 VL 39 IS 4 BP 869 EP 879 PG 11 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA PC982 UT WOS:A1994PC98200009 ER PT J AU CHEN, ZH SACHLEBEN, RA AF CHEN, ZH SACHLEBEN, RA TI H-1 AND C-13 NMR OF SUBSTITUTED DIBENZO-14-CROWN-4 ETHERS SO MAGNETIC RESONANCE IN CHEMISTRY LA English DT Note DE NMR; H-1 NMR; C-13 NMR; CROWN ETHERS; DIBENZO-14-CROWN-4 ID MOLECULAR-STRUCTURE; SOLVENT-EXTRACTION; LARIAT ETHERS; LITHIUM; SPECTROSCOPY; CRYSTAL; COMPLEX; SODIUM; ACID AB Dibenzo-14-crown-4 and eight substituted dibenzo-14-crown-4-ethers were studied by 1D and 2D H-1 and C-13 NMR and their chemical shifts are reported. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. NR 19 TC 0 Z9 0 U1 1 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0749-1581 J9 MAGN RESON CHEM JI Magn. Reson. Chem. PD JUN PY 1994 VL 32 IS 6 BP 375 EP 378 DI 10.1002/mrc.1260320614 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA NR401 UT WOS:A1994NR40100013 ER PT J AU SEGEV, A ZHAO, JL AF SEGEV, A ZHAO, JL TI RULE MANAGEMENT IN EXPERT DATABASE-SYSTEMS SO MANAGEMENT SCIENCE LA English DT Article DE RULE PROCESSING; DERIVED DATA; JOIN INDEXING; DATA MATERIALIZATION; EXPERT DATABASE SYSTEMS AB Expert database systems combine database and expert systems technologies to support the effective management of both rules and data. This paper studies rule processing strategies in expert database systems involving rules that are conditional on joins of relational data. Auxiliary constructs for processing join rules are proposed, and a framework of join rule processing strategies is developed. Cost functions of several strategies are derived based on a stochastic model that characterizes the arrival processes of transactions and queries to the database. Performance evaluation shows that the proposed data constructs and strategies provide an effective method for processing rules. C1 COLL WILLIAM & MARY,GRAD SCH BUSINESS ADM,WILLIAMSBURG,VA 23187. LAWRENCE BERKELEY LAB,DIV INFORMAT & COMP SCI,BERKELEY,CA 94720. RP SEGEV, A (reprint author), UNIV CALIF BERKELEY,WALTER A HAAS SCH BUSINESS,BERKELEY,CA 94720, USA. NR 53 TC 7 Z9 8 U1 0 U2 2 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0025-1909 J9 MANAGE SCI JI Manage. Sci. PD JUN PY 1994 VL 40 IS 6 BP 685 EP 707 DI 10.1287/mnsc.40.6.685 PG 23 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA NX280 UT WOS:A1994NX28000001 ER PT J AU CORKILL, JL RUBIO, A COHEN, ML AF CORKILL, JL RUBIO, A COHEN, ML TI CATION DEPENDENCE OF THE ELECTRONIC-STRUCTURE OF ALAS AND GAAS SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article ID MOLECULAR-BEAM EPITAXY; GALLIUM NITRIDE; BAND-GAPS; GROWTH; PSEUDOPOTENTIALS; SUPERLATTICES; IONICITY; STATE; BAS AB Effects of the cation potential on the electronic structure of AlAs and GaAs are studied using the ab initio pseudo-potential method. Differences between the band gaps and one-electron levels of AlAs and GaAs are explained in terms of the s, p and d angular components of the Al and Ga potentials. Substituting the s- and d-channels of Ga for the corresponding channels in the Al potential reduces the AlAs direct gap by 0.7 and 0.5 eV, respectively. A reduction in the ionicity of GaAs compared to AlAs is mostly due to the stronger Ga-s potential. Comparisons are made to a previous analysis of cation effects in the III-V nitrides. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. NR 32 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JUN PY 1994 VL 25 IS 1 BP 79 EP 84 DI 10.1016/0921-5107(94)90205-4 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA NR204 UT WOS:A1994NR20400014 ER PT J AU KRAMER, PA GLAZER, J MORRIS, JW AF KRAMER, PA GLAZER, J MORRIS, JW TI THE EFFECT OF LOW GOLD CONCENTRATIONS ON THE CREEP OF EUTECTIC TIN-LEAD JOINTS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID SOLDER JOINTS AB The effects of low Au concentrations on the creep properties of a eutectic Sn/Pb alloy were investigated. Creep testing was performed on double-shear specimens of fine-grained, eutectic Sn/Pb joints with Au concentrations of 0, 0.2, 1.0, and 1.5 wt pct Au at 90-degrees-C, 0, 0.2, and 1.0 wt pct Au at 65-degrees-C, and 0.2 wt pct Au at 25-degrees-C. In the absence of Au, the creep of fine-grained eutectic Sn/Pb is dominated by grain-boundary sliding at high homologous temperature and intermediate stress. The addition of 0.2 wt pct Au or more suppressed this mechanism; the high-stress, bulk-creep mechanism was dominant at all stresses tested. Higher concentrations of Au increased porosity within the joints. The porosity decreased joint strength. During failure, the crack path followed softer regions of the joint; cracks propagated through Pb-rich islands or along Sn/Sn grain boundaries. C1 LAWRENCE BERKELEY LAB,DEPT STRUCT MAT,BERKELEY,CA 94720. HEWLETT PACKARD CORP,CTR ELECTR ASSEMBLY DEV,PALO ALTO,CA 94304. RP KRAMER, PA (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 37 TC 27 Z9 27 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD JUN PY 1994 VL 25 IS 6 BP 1249 EP 1257 DI 10.1007/BF02652299 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NM854 UT WOS:A1994NM85400014 ER PT J AU OCONNOR, TG DANTZIG, JA AF OCONNOR, TG DANTZIG, JA TI MODELING THE THIN-SLAB CONTINUOUS-CASTING MOLD SO METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE LA English DT Article AB A three-dimensional mathematical model has been developed to compute the thermomechanical state in the mold of thin-slab continuous casters. The thin-slab mold differs from those used in conventional slab casters in that the upper portion of the broad side walls defines a funnel-shaped chamber which allows the nozzle to be submerged into the liquid metal. The chamber converges with distance down the mold, reducing to the rectangular cross section of the finished casting near the mold exit. The new mold, along with casting speeds up to 6 m/min, allows slabs to be cast 50-60 mm thick, compared with 150 to 350 mm in conventional continuous slab casting. However, the mold shape and high casting speed lead to higher mold temperatures and shorter mold life than are found in conventional slab casters. In this article, we develop mathematical models of the process to determine the role of various process parameters in determining the mold life. Finite-element analysis is used to determine the temperatures in the mold and cast slab, and these data are then used in an elastic-viscoplastic analysis to investigate the deformation of the mold wall in service. Cyclic inelastic strains up to 1.75 pct are found in a region below the meniscus along the funnel edge. These large strains result from the combination of locally high temperatures coupled with geometric restraint of the mold. The deformation leads to short mold life because of thermal fatigue cracking of the mold. The computed locations and time to failure of the mold in fatigue agree very well with observations of the appearance of mold surface cracks in an operating caster. The models are also used to develop an improved mold design. C1 UNIV ILLINOIS, DEPT MECH & IND ENGN, URBANA, IL 61801 USA. RP OCONNOR, TG (reprint author), LAWRENCE LIVERMORE NATL LAB, APPL SUPERCONDUCT GRP, LIVERMORE, CA 94550 USA. NR 52 TC 44 Z9 46 U1 1 U2 5 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1073-5615 J9 METALL MATER TRANS B JI Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci. PD JUN PY 1994 VL 25 IS 3 BP 443 EP 457 DI 10.1007/BF02663395 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA274 UT WOS:A1994PA27400015 ER PT J AU YOUNG, TM GUESS, FM AF YOUNG, TM GUESS, FM TI RELIABILITY PROCESSES AND CORPORATE STRUCTURES SO MICROELECTRONICS AND RELIABILITY LA English DT Article ID HISTORICAL-PERSPECTIVE AB Quality and reliability concepts evolved since the 18th century and before to a stage where the current practitioner has a wide array of tools and algorithms to improve the competitiveness of manufactured products and services. The corporate structures in which engineers and managers apply these quality and reliability concepts are as important to the practitioner as the concepts themselves. Some companies in various countries have had great success in improving the quality and reliability of manufactured products by applying modern principles. However, many businesses and economies throughout the world are in states of decline for a variety of reasons. One key reason is inappropriate management structures for applying these modern principles. Two reliability management perspectives are reviewed in this paper, namely, 1.) Service Response Logistics and 2.) Superior Development for ail Innovative Product. Service Response Logistics focuses on establishing strong relationships directly with customers and delivering value to each customer on an individual basis. Service Response Logistics emphasizes the accuracy of diagnosing customer needs and reliability of delivering benefit to the customer. The insightful work of F.W. Davis is emphasized. Superior Development Process for an Innovative Product involves the development of an integrated product by development teams. The product development process is broken down into distinct components that occur in phases. The structure (process) recognizes that customer expectations need to be assimilated with product ideas and that the selection and development of product and process technology should occur synonymously with a customer needs analysis. The insightful view of C.C. Wilson is stressed. C1 UNIV TENNESSEE,DEPT STAT,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP YOUNG, TM (reprint author), UNIV TENNESSEE,MANAGEMENT SCI PROGRAM,KNOXVILLE,TN 37996, USA. NR 29 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 0026-2714 J9 MICROELECTRON RELIAB JI Microelectron. Reliab. PD JUN PY 1994 VL 34 IS 6 BP 1107 EP 1119 DI 10.1016/0026-2714(94)90075-2 PG 13 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NK836 UT WOS:A1994NK83600015 ER PT J AU ARMENDARIZ, MG HIETALA, VM MYERS, DR AF ARMENDARIZ, MG HIETALA, VM MYERS, DR TI HIGH-SPEED OPTOELECTRONICS SO MICROWAVE JOURNAL LA English DT Article ID GROWTH AB Critical system needs for optoelectronic and photonic components in defense, intelligence, and environmental programs have driven the optoelectronics effort. This paper examines the activities of the Sandia National Laboratories. Such activities include in-house realization of radiation-hardened optoelectronic components, material growth and physics research, device design and fabriction, and test and analysis of completed devices. This paper also illustrates Sandia National Laboratories' application of asymmetric Fabry-Perot modulators for bidirectional communication and optical heterodyning for control of phased-array radars. C1 SANDIA NATL LABS,DEPT MICROELECTR,TECH STAFF,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DEPT COMPOUND SEMICOND TECHNOL,ALBUQUERQUE,NM 87185. RP ARMENDARIZ, MG (reprint author), SANDIA NATL LABS,MICROWAVE SEMICOND GRP,ALBUQUERQUE,NM 87185, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD JUN PY 1994 VL 37 IS 6 BP 64 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NU572 UT WOS:A1994NU57200002 ER PT J AU SLINGERLAND, JM HENGST, L PAN, CH ALEXANDER, D STAMPFER, MR REED, SI AF SLINGERLAND, JM HENGST, L PAN, CH ALEXANDER, D STAMPFER, MR REED, SI TI A NOVEL INHIBITOR OF CYCLIN-CDK ACTIVITY DETECTED IN TRANSFORMING GROWTH-FACTOR BETA-ARRESTED EPITHELIAL-CELLS SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Review ID PROTEIN-KINASE ACTIVITY; BREAST-CANCER-CELLS; H-1 HISTONE KINASE; SACCHAROMYCES-CEREVISIAE; TGF-BETA; FISSION YEAST; MAMMALIAN-CELLS; S-PHASE; SIGNAL-TRANSDUCTION; DEPENDENT KINASE-2 AB Transforming growth factor beta (TGF-beta) is a potent inhibitor of epithelial cell growth. Cyclins E and A in association with Cdk2 have been shown to play a role in the G(1)-to-S phase transition in mammalian cells. We have studied the effects of TGF-beta-mediated growth arrest on G(1)/S cyclins E and A. Inhibition of cyclin A-associated kinase by TGP-beta is primarily due to a decrease in cyclin A mRNA and protein. By contrast, while TGF-beta inhibits accumulation of cyclin E mRNA, the reduction in cyclin E protein is minimal. Instead, we find that the activation of cyclin E-associated kinase that normally accompanies the G(1)-to-S phase transition is inhibited. A novel inhibitor of cyclin-Cdk complexes was detected in TGF-beta-treated cell lysates. Inhibition is mediated by a heat-stable protein that targets both Cdk2 and Cdc2 kinases. In G(0)-arrested cells, a similar inhibitor of Cdk2 kinase was detected. These data suggest the existence of an inhibitor of cyclin-dependent kinases induced under different conditions to mediate antiproliferative responses. C1 SCRIPPS RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV LIFE SCI, BERKELEY, CA 94720 USA. FU NCI NIH HHS [CA-24844]; NIGMS NIH HHS [GM46006] NR 124 TC 303 Z9 306 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0270-7306 J9 MOL CELL BIOL JI Mol. Cell. Biol. PD JUN PY 1994 VL 14 IS 6 BP 3683 EP 3694 PG 12 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA NM741 UT WOS:A1994NM74100016 PM 8196612 ER PT J AU SCHMIDHAUSER, C CASPERSON, GF BISSELL, MJ AF SCHMIDHAUSER, C CASPERSON, GF BISSELL, MJ TI TRANSCRIPTIONAL ACTIVATION BY VIRAL ENHANCERS - CRITICAL DEPENDENCE ON EXTRACELLULAR-MATRIX CELL-INTERACTIONS IN MAMMARY EPITHELIAL-CELLS SO MOLECULAR CARCINOGENESIS LA English DT Note ID RECONSTITUTED BASEMENT-MEMBRANE; CASEIN GENE-EXPRESSION; TRANSGENIC MICE; TERMINAL DIFFERENTIATION; ALBUMIN; PROTEINASES; COMPONENTS; SECRETION; PROMOTER; INVITRO AB Extracellular matrix (ECM)-cell interactions are essential for the regulation of many genes in differentiated cell types. A number of expression vectors that work well in cells cultured on tissue-culture plastic appear to be inactive or sporadically active in vivo. We reasoned that these responses also may be influenced by the ECM. We therefore examined three commonly used viral enhancers and found that they all responded either positively or negatively to the presence of exogenous ECM. Using mouse mammary epithelial cells, we found that a mouse mammary tumor virus enhancer linked to its own promoter or to a truncated (and by itself inactive) beta-casein promoter drove transcription efficiently only when the cells were in contact with an ECM (more than a 100-fold induction over tissue-culture plastic). Similarly, the cytomegalovirus enhancer was more active in cells in contact with ECM. In contrast, the simian virus 40 enhancer, linked to the beta-casein promoter, was 12-fold more active in cells on tissue-culture plastic. This activity was strongly reduced when the cells interacted with ECM. Thus, we conclude that different enhancers can respond to ECM by either activating or suppressing transcription. This observation has important implications for understanding the mechanisms of promoter action and for designing expression systems for use in gene therapy. (C) 1994 Wiley-Liss, Inc. C1 MONSANTO CO,ST LOUIS,MO. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT LIFE SCI,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. RP SCHMIDHAUSER, C (reprint author), ETH ZENTRUM,CH-8092 ZURICH,SWITZERLAND. NR 33 TC 15 Z9 15 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0899-1987 J9 MOL CARCINOGEN JI Mol. Carcinog. PD JUN PY 1994 VL 10 IS 2 BP 66 EP 71 DI 10.1002/mc.2940100203 PG 6 WC Biochemistry & Molecular Biology; Oncology SC Biochemistry & Molecular Biology; Oncology GA NV252 UT WOS:A1994NV25200002 PM 8031466 ER PT J AU DORAN, JC ZHONG, S AF DORAN, JC ZHONG, S TI REGIONAL DRAINAGE FLOWS IN THE PACIFIC-NORTHWEST SO MONTHLY WEATHER REVIEW LA English DT Article ID BASIN AB An analysis of regional drainage flows in the Pacific Northwest is presented using results from a network of surface observations and a series of simulations carried out with a nested mesoscale model. The flows, which occur regularly in southeastern Washington during the late spring and summer months, are marked by an increase in wind speed and a shift to northwesterly wind directions early in the evening. The phenomenon occurs when a deep mixed layer forms east of the Cascade Range, drawing cooler air from the west over the mountain crest. Anabatic and katabatic forcing, terrain channeling, and turning by the Coriolis force combine to produce the characteristic flow patterns. RP DORAN, JC (reprint author), PACIFIC NW LAB, DEPT ATMOSPHER SCI, POB 999,BATTELLE BLVD, RICHLAND, WA 99352 USA. NR 11 TC 15 Z9 15 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD JUN PY 1994 VL 122 IS 6 BP 1158 EP 1167 DI 10.1175/1520-0493(1994)122<1158:RDFITP>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NQ156 UT WOS:A1994NQ15600008 ER PT J AU ROSS, FM AF ROSS, FM TI MATERIALS SCIENCE IN THE ELECTRON-MICROSCOPE SO MRS BULLETIN LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; MOLECULAR-BEAM EPITAXY; SILICON THIN-FILMS; X 7 SURFACES; AMORPHOUS-SILICON; TEMPERATURE OXIDATION; INSITU INVESTIGATIONS; DYNAMIC OBSERVATION; ATOMIC-RESOLUTION; PHASE-TRANSITION RP ROSS, FM (reprint author), LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720, USA. NR 72 TC 0 Z9 0 U1 0 U2 3 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 1994 VL 19 IS 6 BP 17 EP 20 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NT036 UT WOS:A1994NT03600002 ER PT J AU DAHMEN, U AF DAHMEN, U TI EVOLUTION OF GE PRECIPITATE MORPHOLOGY IN AL SO MRS BULLETIN LA English DT Article RP DAHMEN, U (reprint author), LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720, USA. NR 15 TC 6 Z9 6 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1994 VL 19 IS 6 BP 22 EP 25 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NT036 UT WOS:A1994NT03600003 ER PT J AU TWESTEN, RD GIBSON, JM ROSS, FM AF TWESTEN, RD GIBSON, JM ROSS, FM TI VISUALIZATION OF DYNAMIC NEAR-SURFACE PROCESSES SO MRS BULLETIN LA English DT Article ID TRANSMISSION ELECTRON-DIFFRACTION; MOLECULAR-BEAM EPITAXY; ATOMIC STEPS; MICROSCOPY; SI(111)-7X7; RESOLUTION; STRAIN; INSITU C1 UNIV ILLINOIS,DEPT MAT SCI,URBANA,IL 61801. WAYNE STATE UNIV,DETROIT,MI 48202. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP TWESTEN, RD (reprint author), UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801, USA. RI Gibson, Murray/E-5855-2013 OI Gibson, Murray/0000-0002-0807-6224 NR 22 TC 10 Z9 10 U1 1 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 1994 VL 19 IS 6 BP 38 EP 43 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NT036 UT WOS:A1994NT03600006 ER PT J AU ADLER, ID SHELBY, MD BOOTMAN, J FAVOR, J GENEROSO, W PACCHIEROTTI, F SHIBUYA, T TANAKA, N AF ADLER, ID SHELBY, MD BOOTMAN, J FAVOR, J GENEROSO, W PACCHIEROTTI, F SHIBUYA, T TANAKA, N TI SUMMARY REPORT OF THE WORKING-GROUP-ON-MAMMALIAN-GERM-CELL-TESTS SO MUTATION RESEARCH LA English DT Article; Proceedings Paper CT International Workshop on Standardisation of Genotoxicity Test Procedures CY FEB, 1993 CL MELBOURNE, AUSTRALIA DE MAMMALIAN GERM CELL CYTOGENETIC ASSAY; RODENT DOMINANT LETHAL TEST ID DOMINANT LETHAL MUTATIONS; MALE-MICE; INDUCTION AB The two tests considered by the Working Group were the mammalian germ cell cytogenetic assay and the rodent dominant lethal test. It was agreed that both tests were mainly used for identification of germ cell hazards, however, that the commonly applied protocol of the dominant lethal assay often supplied information for hazard characterization such as sensitivity of particular developmental stages of male germ cells. No particular species or strains were indicated. Concurrent solvent controls were regarded as indispensable for both tests. In the discussion of the mammalian germ cell cytogenetic assay, harmonization was obtained to a large extent with the cytogenetic bone marrow assay regarding the number of animals (5), the number of cells analyzed per animal (200), the highest exposure dose (MTD) and sampling times (twice within 24 and 48 h after dosing). However, it was pointed out that only the single acute exposure was adequate for the mammalian germ cell cytogenetic assay. Furthermore, it was stated that only structural chromosome aberrations could be analyzed and that it was not informative to score polyploidies or aneuploidies. In the discussion of the rodent dominant lethal test, it was stated that the assay was generally performed with treated males, however, increasing concern about female specific effects required that a protocol for female dominant lethal testing should be developed and validated. Acute and subacute treatment schedules were considered equally acceptable. It was regarded as highly important that the entire male germ cell development from meiosis to mature sperm was covered in the test protocol either by the appropriate mating schedules after single dosing or by subchronic dosing during the respective period. Postimplantation loss, preimplantation loss and fertility rate were the main parameters to be assessed in the rodent dominant lethal tests. It was agreed that the size of the experiment depended on the spontaneous frequency of dead implants, the mating scheme and the statistical design of the experiment. C1 NIEHS,RES TRIANGLE PK,NC 27709. LIFE SCI RES,SUFFOLK,ENGLAND. ORNL,DIV BIOL,OAK RIDGE,TN. CTR RIC ENERGIA CASACCIA,ENEA,ROME,ITALY. HATANO RES INST,KANAGAWA,JAPAN. RP ADLER, ID (reprint author), GSF,INST SAUGETIERGENET,OBERSCHLEISSHEIM,GERMANY. NR 19 TC 14 Z9 14 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD JUN PY 1994 VL 312 IS 3 BP 313 EP 318 DI 10.1016/0165-1161(94)00017-4 PG 6 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA NQ875 UT WOS:A1994NQ87500012 PM 7514743 ER PT J AU BROUGHTON, BC STEINGRIMSDOTTIR, H WEBER, CA LEHMANN, AR AF BROUGHTON, BC STEINGRIMSDOTTIR, H WEBER, CA LEHMANN, AR TI MUTATIONS IN THE XERODERMA-PIGMENTOSUM GROUP-D DNA REPAIR/TRANSCRIPTION GENE IN PATIENTS WITH TRICHOTHIODYSTROPHY SO NATURE GENETICS LA English DT Article ID NUCLEOTIDE-EXCISION-REPAIR; SACCHAROMYCES-CEREVISIAE; RAD3 PROTEIN; YEAST RAD3; HELICASE; CLONING; ERCC2; HETEROGENEITY; RECOMBINATION; DISORDER AB DNA repair defects in the xeroderma pigmentosum (XP) group D complementation group can be associated with the clinical features of two quite different disorders; XP, a sun-sensitive and cancer-prone disorder, or trichothiodystrophy (TTD) which is characterized by sulphur-deficient brittle hair and a variety of other associated abnormalities, but no skin cancer. The XPD gene product, a DNA helicase, is required for nucleotide excision repair and recent evidence has demonstrated a role in transcription. We have now identified causative mutations in XPD in four TTD patients. The patients are all compound heterozygotes and the locations of the mutations enable us to suggest relationships between different domains in the gene and its roles in excision repair and transcription. C1 UNIV SUSSEX,MRC,CELL MUTAT UNIT,BRIGHTON BN1 9RR,ENGLAND. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551. NR 33 TC 119 Z9 120 U1 0 U2 6 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 1061-4036 J9 NAT GENET JI Nature Genet. PD JUN PY 1994 VL 7 IS 2 BP 189 EP 194 DI 10.1038/ng0694-189 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA NQ037 UT WOS:A1994NQ03700021 PM 7920640 ER PT J AU PAOLETTI, F IGNAT, DW KESNER, J BERNABEI, S KAITA, R LEBLANC, B LEVINTON, FM LUCKHARDT, SC AF PAOLETTI, F IGNAT, DW KESNER, J BERNABEI, S KAITA, R LEBLANC, B LEVINTON, FM LUCKHARDT, SC TI LOWER-HYBRID CURRENT DRIVE ACCESSIBILITY STUDY WITH RECONSTRUCTED MAGNETIC EQUILIBRIA IN PBX-M SO NUCLEAR FUSION LA English DT Article ID PITCH-ANGLE MEASUREMENTS; M TOKAMAK AB Ray tracing simulations based on experimental PBX-M equilibria show a limited range of the parallel wavenumber (n(parallel-to) = k(parallel-to)c/omega) along a my trajectory. The range of n(parallel-to) accessible to the excited wave is shown to have both a lower and an upper bound. The ray's phase volume is projected into (n(parallel-to), R, Z) space to define a domain of wave accessibility for each toroidal mode number excited by the launcher. A comparison of circular and bean shaped plasmas with a high aspect ratio (A approximately 5.5) shows that the rays fill a substantially larger portion of the accessible domain in bean shaped plasmas. Furthermore, in the bean shaped case the accessible domain tends to extend to higher n(parallel-to). C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. FUS PHYS & TECHNOL,TORRANCE,CA. RP PAOLETTI, F (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 21 TC 20 Z9 20 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUN PY 1994 VL 34 IS 6 BP 771 EP 776 DI 10.1088/0029-5515/34/6/I01 PG 6 WC Physics, Fluids & Plasmas SC Physics GA PB822 UT WOS:A1994PB82200001 ER PT J AU REDI, MH CUMMINGS, JC BUSH, CE FREDRICKSON, ED GREK, B HAHM, TS HILL, KW JOHNSON, DW MANSFIELD, DK PARK, HK SCOTT, SD STRATTON, BC SYNAKOWSKI, EJ TANG, WM TAYLOR, G AF REDI, MH CUMMINGS, JC BUSH, CE FREDRICKSON, ED GREK, B HAHM, TS HILL, KW JOHNSON, DW MANSFIELD, DK PARK, HK SCOTT, SD STRATTON, BC SYNAKOWSKI, EJ TANG, WM TAYLOR, G TI TRANSPORT SIMULATIONS OF TFTR - THEORETICALLY BASED TRANSPORT MODELS AND CURRENT SCALING SO NUCLEAR FUSION LA English DT Article ID ANOMALOUS THERMAL CONFINEMENT; TOKAMAK TRANSPORT; ENERGY CONFINEMENT; CODE; TURBULENCE; ELECTRON; PROFILES; GRADIENT; BALDUR; PLT AB Predictions for TFTR current scaling experiments are investigated for four recent theoretically based models, to find support for empirical current scaling used for planning future fusion devices. The profile-consistent drift wave model is found to predict current scaling. None of three multimode models, including the Bateman Version 5. 10 model, previously claimed to show current scaling for TFTR, succeeds in simulating measured temperature and density profiles for either high or low current experiments. Standard edge resistive ballooning mode models do not lead to I(p) scaling of confinement, underestimating losses at low current by factors of 2 to 4. RP REDI, MH (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 48 TC 3 Z9 3 U1 0 U2 3 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 1994 VL 34 IS 6 BP 809 EP 823 DI 10.1088/0029-5515/34/6/I05 PG 15 WC Physics, Fluids & Plasmas SC Physics GA PB822 UT WOS:A1994PB82200005 ER PT J AU MESSIAEN, AM ONGENA, J SAMM, U UNTERBERG, B VANDENPLAS, PE VANOOST, G VANWASSENHOVE, G WINTER, J BOUCHER, D DUMORTIER, P DURODIE, F ESSER, HG EURINGER, H GIESEN, B HINTZ, E LOCHTER, M TOKAR, MZ WOLF, GH FUCHS, G HILLIS, DL HOENEN, F HUTTEMANN, P KOCH, R KONEN, L KOSLOWSKI, HR KRAMERFLECKEN, A PETTIAUX, D POSPIESZCZYK, A SCHWEER, B SOLTWISCH, H TELESCA, G UHLEMANN, R VANNIEUWENHOVE, R VERVIER, M WAIDMANN, G WEYNANTS, RR AF MESSIAEN, AM ONGENA, J SAMM, U UNTERBERG, B VANDENPLAS, PE VANOOST, G VANWASSENHOVE, G WINTER, J BOUCHER, D DUMORTIER, P DURODIE, F ESSER, HG EURINGER, H GIESEN, B HINTZ, E LOCHTER, M TOKAR, MZ WOLF, GH FUCHS, G HILLIS, DL HOENEN, F HUTTEMANN, P KOCH, R KONEN, L KOSLOWSKI, HR KRAMERFLECKEN, A PETTIAUX, D POSPIESZCZYK, A SCHWEER, B SOLTWISCH, H TELESCA, G UHLEMANN, R VANNIEUWENHOVE, R VERVIER, M WAIDMANN, G WEYNANTS, RR TI IMPROVED CONFINEMENT WITH EDGE RADIATIVE COOLING AT HIGH-DENSITIES AND HIGH HEATING POWER IN TEXTOR SO NUCLEAR FUSION LA English DT Article ID PLASMAS AB Improved confinement is achieved on TEXTOR under high power conditions (up to 4 MW of additional heating with NBI-co+ICRH, NBI-co+counter or NBI-co+counter+ICRH) with edge radiative cooling employing silicon or neon as the radiating impurities. It is shown that in quasi-stationary conditions up to 85% of the input power can be radiated. Such high power fractions offer the possibility of utilizing these techniques to facilitate the power exhaust problem for a tokamak reactor. Discharges with edge radiative cooling exhibit enhanced confinement properties at high densities, e.g. at a central line averaged electron density of 7.5 x 10(13) CM-3 , an enhancement factor of 1.7 over ITER L89-P confinement scaling is obtained with an edge q value as low as 2.7. Stable discharges have been obtained even with the q = 2 surface located inside the radiating zone. Furthermore, for radiatively cooled discharges heated with balanced NBI-co+ counter with or without ICRH, supershot-like peaked electron density profiles, with central density values above 1.0 X 10(14) CM-3, are observed. The present results show that there is no impurity accumulation in the centre and the Ne and/or Si concentration is so low that the reactivity of the plasma remains unaffected. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. ITER JOINT CENT TEAM, LA JOLLA, CA USA. MOSCOW HIGH TEMP INST, MOSCOW, RUSSIA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, EURATOM ASSOC, INST PLASMAPHYS, W-5170 JULICH 1, GERMANY. RP MESSIAEN, AM (reprint author), ECOLE ROYALE MIL, ASSOC EURATOM, PHYS PLASMA LAB, BRUSSELS, BELGIUM. OI Tokar, Mikhail/0000-0002-9536-9841; Unterberg, Bernhard/0000-0003-0866-957X NR 29 TC 58 Z9 58 U1 0 U2 8 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 1994 VL 34 IS 6 BP 825 EP 836 DI 10.1088/0029-5515/34/6/I06 PG 12 WC Physics, Fluids & Plasmas SC Physics GA PB822 UT WOS:A1994PB82200006 ER PT J AU IGNAT, DW VALEO, EJ JARDIN, SC AF IGNAT, DW VALEO, EJ JARDIN, SC TI DYNAMIC MODELING OF LOWER-HYBRID CURRENT DRIVE SO NUCLEAR FUSION LA English DT Article ID BEAN-SHAPED TOKAMAKS; RF CURRENT DRIVE; PBX-M TOKAMAK; DENSITY-FLUCTUATIONS; WAVE-PROPAGATION; FOKKER-PLANCK; PLT TOKAMAK; STABILITY; PLASMAS; TRANSPORT AB A dynamic computational model of lower hybrid current drive in the presence of an electric field is described and some results are given. Details of geometry, plasma profiles and circuit equations are treated carefully. Two dimensional velocity space effects are approximated in a one dimensional Fokker-Planck treatment. The model is unable to approximate experimental results in some cases characterized by low density, low current, high aspect ratio and a launched spectrum at high phase velocity relative to the thermal velocity. In other cases, qualitative agreement with measurements is found. A simple formula already in the literature appears to determine whether agreement of model and experiment will be good or poor. Application to an experimental discharge in which q(0) is raised above unity shows an appropriate time-scale. Computation of a planned effort for high beta suggests potential success. RP IGNAT, DW (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Jardin, Stephen/E-9392-2010 NR 66 TC 84 Z9 86 U1 1 U2 5 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 1994 VL 34 IS 6 BP 837 EP 852 DI 10.1088/0029-5515/34/6/I07 PG 16 WC Physics, Fluids & Plasmas SC Physics GA PB822 UT WOS:A1994PB82200007 ER PT J AU CHRISTIAN, DC BERISSO, MC GUTIERREZ, G HOLMES, SD WEHMANN, A AVILEZ, C FELIX, J MORENO, G ROMERO, M SOSA, M FORBUSH, M HUSON, FR WIGHTMAN, JA GARA, A KNAPP, BC SIPPACH, W HARTOUNI, EP JENSEN, DA KREISLER, MN LEE, S MARKIANOS, K WESSON, D AF CHRISTIAN, DC BERISSO, MC GUTIERREZ, G HOLMES, SD WEHMANN, A AVILEZ, C FELIX, J MORENO, G ROMERO, M SOSA, M FORBUSH, M HUSON, FR WIGHTMAN, JA GARA, A KNAPP, BC SIPPACH, W HARTOUNI, EP JENSEN, DA KREISLER, MN LEE, S MARKIANOS, K WESSON, D TI HIGH-RATE DRIFT CHAMBERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Fermilab experiment 690 [1], a study of target dissociation reactions pp --> pX using an 800 GeV/c proton beam and a liquid hydrogen target, collected data in late 1991. The incident beam and 600-800 GeV/c scattered protons were measured using a system of six 6 in. X 4 in. and two 15 in. X 8 in. pressurized drift chambers spaced over 260 m. These chambers provided precise measurements at rates above 10 MHz (2 MHz per cm of sense wire). The measurement resolution of the smaller chambers was 90 mum, and the resolution of the larger chambers was 125 mum. Construction details and performance results, including radiation damage, are presented. C1 UNIV GUANAJUATO,INST FIS,LEON,GUANAJUATO,MEXICO. COLUMBIA UNIV,NEVIS LABS,IRVINGTON,NY 10533. TEXAS A&M UNIV,DEPT PHYS,COLLEGE STN,TX 77843. UNIV MASSACHUSETTS,DEPT PHYS & ASTRON,AMHERST,MA 01003. RP CHRISTIAN, DC (reprint author), FERMILAB NATL ACCELERATOR LAB,MS 220,POB 500,BATAVIA,IL 60510, USA. OI Hartouni, Edward/0000-0001-9869-4351 NR 10 TC 30 Z9 30 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1994 VL 345 IS 1 BP 62 EP 71 DI 10.1016/0168-9002(94)90972-5 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM764 UT WOS:A1994NM76400006 ER PT J AU BLISS, M CRAIG, RA REEDER, PL AF BLISS, M CRAIG, RA REEDER, PL TI METHOD FOR MEASURING THE LIGHT OUTPUT OF SCINTILLATING GLASS SHARDS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB In order to determine the physical processes that govern the production of light in scintillating glasses, it is necessary to work with as-produced samples which have not been subjected to heat treatment, polishing, or other preparation. A combination of an optical system, which is insensitive to sample size and shape, and a Compton backscatter coincidence technique provides a method which gives precise and reproducible results when working with such samples. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Bliss, Mary/G-2240-2012 OI Bliss, Mary/0000-0002-7565-4813 NR 2 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1994 VL 345 IS 1 BP 95 EP 98 DI 10.1016/0168-9002(94)90975-X PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM764 UT WOS:A1994NM76400009 ER PT J AU AHLEN, SP LOOMBA, D MARIN, A ZHOU, B HE, YD PRICE, PB SNOWDENIFFT, DP BOWER, C MUSSER, JA COAN, TE TARLE, G TOMASCH, A SALAMON, MH BEATTY, JJ CRARY, DJ AF AHLEN, SP LOOMBA, D MARIN, A ZHOU, B HE, YD PRICE, PB SNOWDENIFFT, DP BOWER, C MUSSER, JA COAN, TE TARLE, G TOMASCH, A SALAMON, MH BEATTY, JJ CRARY, DJ TI FLIGHT PERFORMANCE OF EXAM - A BALLOON-BORNE DETECTOR TO SEARCH FOR EXTRAGALACTIC ANTIMATTER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID RESOLUTION AB We describe the performance of the EXAM detector during its five hour balloon flight in 1988. EXAM is an experiment designed to search for cosmic rays of extragalactic origin which are made of antimatter. The EXAM technique to identify antinuclei is unique, being based on higher order corrections to electronic stopping power of charged particles, and on the response characteristics of CR-39 track-etch detectors, plastic scintillators, and Cherenkov radiators. Included in the present paper are the completed analysis of the electronic detectors, and preliminary results of the analysis of the track-etch detectors, including a demonstration of our ability to match particles identified with the drift tube tracking elements during the flight with their tracks found in the passive CR-39 detectors. When the CR-39 analysis is complete, we will have approximately 10000 events for which antimatter analysis can be made. C1 UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. RP AHLEN, SP (reprint author), BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215, USA. RI Beatty, James/D-9310-2011 OI Beatty, James/0000-0003-0481-4952 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1994 VL 345 IS 1 BP 156 EP 178 DI 10.1016/0168-9002(94)90985-7 PG 23 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM764 UT WOS:A1994NM76400019 ER PT J AU SIVERS, EA HOLLOWAY, DA ELLINGSON, WA AF SIVERS, EA HOLLOWAY, DA ELLINGSON, WA TI PREDICTING THE PERFORMANCE OF 3D X-RAY COMPUTERIZED-TOMOGRAPHY SYSTEMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MONTE-CARLO SIMULATION; FLUORESCENT SCREENS; IMAGING-SYSTEMS; DETAIL; NOISE; ABSORPTION; EFFICIENCY; RADIOLOGY; DETECTOR; QUALITY AB A model is presented that predicts contrast detectability and resolvability in 3D X-ray computerized tomography images as a function of X-ray source energy, area detector type, data collection hardware, and other system parameters. The model has been found to agree well with experimental observation and to compare favorably with prior theoretical models. This model is used to evaluate the performance of eight different area detector configurations in a micro-focus X-ray system used to inspect small ceramic components. Predicted performance is consistent with that of known systems and serves to illustrate the complexity of imaging system design. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP SIVERS, EA (reprint author), ARGONNE NATL LAB,18028 WESTMINSTER DR,LAKE OSWEGO,OR 97034, USA. NR 31 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1994 VL 345 IS 1 BP 179 EP 197 DI 10.1016/0168-9002(94)90986-5 PG 19 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM764 UT WOS:A1994NM76400020 ER PT J AU SMITH, D BROWNE, E AF SMITH, D BROWNE, E TI CALCULATED UNCERTAINTIES OF ABSOLUTE GAMMA-RAY INTENSITIES AND DECAY BRANCHING RATIOS DERIVED FROM DECAY SCHEMES (VOL 249, PG 461, 1986) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Correction, Addition C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SMITH, D (reprint author), NATL PHYS LAB,TEDDINGTON TW11 0LW,MIDDX,ENGLAND. NR 1 TC 8 Z9 8 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 1 PY 1994 VL 345 IS 1 BP 215 EP 216 DI 10.1016/0168-9002(94)90992-X PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM764 UT WOS:A1994NM76400026 ER PT J AU DAVIS, JC AF DAVIS, JC TI AMS BEYOND 2000 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID BIO-MEDICAL SCIENCES; DOSIMETRY AB Extrapolation of developments in accelerator mass spectrometry since the 1990 conference in Paris tempts one to predict the future of the technology. The rapid expansion of biomedical applications of AMS has required not just development of high throughput spectrometers but demonstration of very short experimental cycles, typically a week or less. Such short cycles then make possible the virtual decoupling of sophisticated sample preparation methodologies from the spectrometer itself, imposing greater need for spectrometer availability and reliability. Established research uses of AMS in archaeology and the geosciences will benefit greatly from these developments and be modified by them. The future appears to hold a mix of proliferation of independent, discipline-dependent sample preparation labs, of large numbers of relatively inexpensive optimized spectrometers, and of steady pressure for capability, reliability, and throughput upgrades of the large multi-isotope laboratories. RP DAVIS, JC (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550, USA. NR 14 TC 13 Z9 13 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 1994 VL 92 IS 1-4 BP 1 EP 6 DI 10.1016/0168-583X(94)95963-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700002 ER PT J AU PROCTOR, ID SOUTHON, JR ROBERTS, ML AF PROCTOR, ID SOUTHON, JR ROBERTS, ML TI DEVELOPMENT OF I-129 AMS FOR THE LLNL SPECTROMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID ISOTRACE AB The multi-user tandem laboratory at LLNL was designed to be a versatile facility which could be configured to develop new capabilities as determined by the requirements of sponsoring agencies and experimental programs. The initial design made some compromises, driven by both the usual budgetary constraints and uncertainties in program needs and support. We were recently funded by the Office of Arms Control in the U.S. DOE to develop an I-129 AMS capability. The first I-129 measurements were performed this year after upgrades and modifications to the originally installed components were completed. The configuration of the present spectrometer and performance achieved to date will be described. Planned improvements to the injector and high energy spectrometer will be outlined. RP PROCTOR, ID (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550, USA. NR 11 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 92 EP 95 DI 10.1016/0168-583X(94)95984-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700023 ER PT J AU ROBERTS, ML NORMAN, PJ GARIBALDI, JL HORNADY, RS AF ROBERTS, ML NORMAN, PJ GARIBALDI, JL HORNADY, RS TI THE NEW LLNL AMS SAMPLE CHANGER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA AB The Center for Accelerator Mass Spectrometry at LLNL has installed a new 64 position AMS sample changer on our spectrometer. This new sample changer has the capability of being controlled manually by an operator or automatically by the AMS data acquisition computer. Automatic control of the sample changer by the data acquisition system is a necessary step towards unattended AMS operation in our laboratory. The sample changer uses a fiber optic shaft encoder for rough rotational indexing of the sample wheel and a series of sequenced pneumatic cylinders for final mechanical indexing of the wheel and insertion and retraction of samples. Transit time from sample to sample varies from 4 to 19 s, depending on distance moved. Final sample location can be set to within 50 microns on the x and y axis and within 100 microns in the z axis. Changing sample wheels on the new sample changer is also easier and faster than was possible on our previous sample changer and does not require the use of any tools. RP ROBERTS, ML (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550, USA. NR 3 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 111 EP 114 DI 10.1016/0168-583X(94)95988-9 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700027 ER PT J AU KUTSCHERA, W PAUL, M AHMAD, I ANTAYA, TA BILLQUIST, PJ GLAGOLA, BG HARKEWICZ, R HELLSTROM, M MORRISSEY, DJ PARDO, RC REHM, KE SHERRILL, BM STEINER, M AF KUTSCHERA, W PAUL, M AHMAD, I ANTAYA, TA BILLQUIST, PJ GLAGOLA, BG HARKEWICZ, R HELLSTROM, M MORRISSEY, DJ PARDO, RC REHM, KE SHERRILL, BM STEINER, M TI LONG-LIVED NOBLE-GAS RADIONUCLIDES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID ACCELERATOR MASS-SPECTROMETRY; MILK RIVER AQUIFER; OPERATING EXPERIENCE; ION; ALBERTA; CANADA; ATLAS; KR-81 AB The first AMS measurements of Ar-39 and Kr-81 have been performed by combining positive-ion production in an ECR ion source with acceleration to 6 MeV/A in the ATLAS linear accelerator and detection in a gas-filled spectrograph. Sensitivities of Ar-39/Ar = 8 x 10(-16) (natural argon), and Kr-18/Kr = 2 x 10(-10) (neutron-activated krypton)were achieved. A full-stripping experiment for Kr-81-Br-81 separation at 45 MeV/A was performed with the MSU K1200 cyclotron. Substantial contributions from nuclear reactions in a Be stripper foil were observed, in the attempt to detect Kr-81(36+) ions in the A1200 recoil separator. The general situation for the detection of noble gas radionuclides is discussed. C1 UNIV VIENNA,INST RADIUMFORSCH & KERNPHYS,A-1090 VIENNA,AUSTRIA. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824. RP KUTSCHERA, W (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Sherrill, Bradley/B-4098-2009; Sherrill, Bradley/B-3378-2011 NR 38 TC 31 Z9 32 U1 0 U2 5 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 1994 VL 92 IS 1-4 BP 241 EP 248 DI 10.1016/0168-583X(94)96013-5 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700052 ER PT J AU BERKOVITS, D BOARETTO, E HEBER, O HOLLOS, G KORSCHINEK, G KUTSCHERA, W PAUL, M AF BERKOVITS, D BOARETTO, E HEBER, O HOLLOS, G KORSCHINEK, G KUTSCHERA, W PAUL, M TI STUDY OF WEAKLY-FORMED NEGATIVE-IONS BY LASER PHOTODETACHMENT AND ACCELERATOR MASS-SPECTROMETRY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID ELECTRON-AFFINITIES; ELEMENTS; YB AB A method of study of weakly-formed negative ions by excitation in laser light and accelerator mass spectrometry is described. Measurement of the photoelectric detachment cross section of the extra electron as a function of the photon energy gives information on the electron affinity. Absolute cross sections for photodetachment of negative ions of La, Ce, Th and U have been measured at the fundamental wavelength (1064 nm) of a Nd:YAG laser. To demonstrate the feasibility of determination of the electron affinity by this method, measurements near the threshold of photodetachment in Te with known electron affinity (1.971 eV) were performed. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. WEIZMANN INST SCI,DEPT NUCL PHYS,ACCELERATOR LAB,IL-76100 REHOVOT,ISRAEL. TECH UNIV GARCHING,FACHBEREICH PHYS,D-85747 GARCHING,GERMANY. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. NR 19 TC 10 Z9 10 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 1994 VL 92 IS 1-4 BP 254 EP 257 DI 10.1016/0168-583X(94)96015-1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700054 ER PT J AU REEDY, RC NISHIIZUMI, K LAL, D ARNOLD, JR ENGLERT, PAJ KLEIN, J MIDDLETON, R JULL, AJT DONAHUE, DJ AF REEDY, RC NISHIIZUMI, K LAL, D ARNOLD, JR ENGLERT, PAJ KLEIN, J MIDDLETON, R JULL, AJT DONAHUE, DJ TI SIMULATIONS OF TERRESTRIAL IN-SITU COSMOGENIC-NUCLIDE PRODUCTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID COSMIC-RAYS; BE-10; AL-26; EXPOSURE; QUARTZ; ROCKS; RATES; CORE AB Targets of silicon and silicon dioxide were irradiated with spallation neutrons to simulate the production of long-lived radionuclides in the surface of the Earth. Gamma-ray spectroscopy was used to measure Be-7 and Na-22, and accelerator mass spectrometry was used to measure Be-10, C-14, and Al-26. The measured ratios of these nuclides are compared with calculated ratios and with ratios from other simulations and agree well with ratios inferred from terrestrial samples. C1 UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. SAN JOSE STATE UNIV,NUCL SCI FACIL,SAN JOSE,CA 95192. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. UNIV ARIZONA,NSF ACCELERATOR FACIL RADIOISOTOPE ANAL,TUCSON,AZ 85721. RP REEDY, RC (reprint author), LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,MS-D436,LOS ALAMOS,NM 87545, USA. OI Reedy, Robert/0000-0002-2189-1303 NR 28 TC 20 Z9 21 U1 1 U2 4 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 1994 VL 92 IS 1-4 BP 297 EP 300 DI 10.1016/0168-583X(94)96022-4 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700061 ER PT J AU DEP, L ELMORE, D FABRYKAMARTIN, J MASARIK, J REEDY, RC AF DEP, L ELMORE, D FABRYKAMARTIN, J MASARIK, J REEDY, RC TI PRODUCTION-RATE SYSTEMATICS OF IN-SITU-PRODUCED COSMOGENIC NUCLIDES IN TERRESTRIAL ROCKS - MONTE-CARLO APPROACH OF INVESTIGATING CL-35(N,GAMMA)CL-36 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID INSITU; CL-36 AB A model is presented to investigate the systematics of in-situ low-energy neutron-capture-produced cosmogenic nuclides in terrestrial rocks, in particular Cl-35(n,gamma)Cl-36, by using a Monte Carlo neutron transport code. The model is validated by comparison of its results with experimental measurements of low-energy cosmogenic neutrons on the Earth's surface. The dependence of Cl-36 production on the elemental composition and water content of rocks has been determined. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DEP, L (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. NR 17 TC 31 Z9 32 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 1994 VL 92 IS 1-4 BP 321 EP 325 DI 10.1016/0168-583X(94)96027-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700066 ER PT J AU REEDY, RC TUNIZ, C FINK, D AF REEDY, RC TUNIZ, C FINK, D TI REPORT ON THE WORKSHOP ON PRODUCTION-RATES OF TERRESTRIAL IN-SITU-PRODUCED COSMOGENIC NUCLIDES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID HIGH-ENERGY NEUTRONS; AL-26; ROCKS; BE-10; EXPOSURE AB Production rates of cosmogenic nuclides made in-situ in terrestrial samples and how they are applied to the interpretation of measured radionuclide concentrations were discussed at a one-day Workshop held 2 October 1993 in Sydney, Australia. The status of terrestrial in-situ studies using the long-lived radionuclides C-14, Be-10, Al-26, Cl-36, and Ca-41 and of various models were presented. The uncertainties in and magnitudes of various factors that go into data interpretation were discussed; no single factor was found to dominate the final uncertainty. C1 AUSTRALIAN NUCL SCI & TECHNOL ORG,MENAI,NSW 2234,AUSTRALIA. RP REEDY, RC (reprint author), LOS ALAMOS NATL LAB,ASTROPHYS & RADIAT MEASUREMENT GRP,MAIL STOP D436,LOS ALAMOS,NM 87545, USA. RI fink, David/A-9518-2012; OI Reedy, Robert/0000-0002-2189-1303 NR 23 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 335 EP 339 DI 10.1016/0168-583X(94)96030-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700069 ER PT J AU VOGEL, JS TURTELTAUB, KW AF VOGEL, JS TURTELTAUB, KW TI ACCELERATOR MASS-SPECTROMETRY IN BIOMEDICAL-RESEARCH SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID HETEROCYCLIC AMINE CARCINOGENS; BIO-MEDICAL SCIENCES; AL-26 TRACER; COOKED FOOD; DOSIMETRY; ALUMINUM; AMS; RADIOCARBON; ABSORPTION; NEUTRONS AB Biological effects occur in natural systems at chemical concentrations of parts per billion (1:10(9)) or less. Affected biomolecules may be separable in only milligram or microgram quantities. Quantification at attomole sensitivity is needed to study these interactions. AMS measures isotope concentrations to parts per 10(13-15) on milligram-sized samples and is ideal for quantifying long-lived radioisotopic labels for tracing biochemical pathways in natural systems. C-14-AMS has now been coupled to a variety of organic separation and definition technologies. Our primary research investigates pharmacokinetics and genotoxicities of toxins and drugs at very low doses. Human subjects research using AMS includes nutrition, toxicity and elemental balance studies. H-3, Ca-41 and Al-26 are also traced by AMS for fundamental biochemical kinetic research. Expansion of biomedical AMS awaits further development of biochemical and accelerator technologies designed specifically for these applications. C1 LAWRENCE LIVERMORE NATL LAB, BIOL & BIOTECHNOL RES PROGRAM L452, LIVERMORE, CA 94550 USA. RP LAWRENCE LIVERMORE NATL LAB, CTR AMS, L397, LIVERMORE, CA 94550 USA. NR 34 TC 42 Z9 42 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X EI 1872-9584 J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 445 EP 453 DI 10.1016/0168-583X(94)96052-6 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700091 ER PT J AU CREEK, MR FRANTZ, CE FULTZ, E HAACK, K REDWINE, K SHEN, N TURTELTAUB, KW VOGEL, JS AF CREEK, MR FRANTZ, CE FULTZ, E HAACK, K REDWINE, K SHEN, N TURTELTAUB, KW VOGEL, JS TI C-14 AMS QUANTIFICATION OF BIOMOLECULAR INTERACTIONS USING MICROBORE AND PLATE SEPARATIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID ACCELERATOR AB AMS directly counts radioisotopes without interference from molecular isobars. No chemical or physical information other than a bulk isotope ratio is available from the usual AMS instrument. Chemical or biological significance of the isotope ratio depends on the definition of the sample prior to conversion to material used in the AMS ion source. We use AMS as a detector for microbore and plate-based separation techniques in quantifying the binding of C-14-labeled compounds to specific DNA and protein fragments. We discuss our methods of using these microbore and plate separations of biomolecules while controlling contamination from C-14 in laboratory equipment and give examples. C1 LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,BIOL BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. NR 6 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 454 EP 458 DI 10.1016/0168-583X(94)96053-4 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700092 ER PT J AU ROBERTS, ML VELSKO, C TURTELTAUB, KW AF ROBERTS, ML VELSKO, C TURTELTAUB, KW TI TRITIUM AMS FOR BIOMEDICAL APPLICATIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA AB We are developing H-3 AMS to measure H-3 activity of mg-sized biological samples. LLNL has already successfully applied C-14 AMS to a variety of problems in the area of biomedical research. Development of H-3 AMS would greatly complement these studies. The ability to perform H-3 AMS measurements at sensitivities equivalent to those obtained for C-14 will allow us to perform experiments using compounds that are not readily available in C-14-tagged form. A H-3 capability would also allow us to perform unique double-labeling experiments in which we learn the fate, distribution, and metabolism of separate fractions of biological compounds. RP ROBERTS, ML (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550, USA. NR 6 TC 17 Z9 17 U1 2 U2 7 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 1994 VL 92 IS 1-4 BP 459 EP 462 DI 10.1016/0168-583X(94)96054-2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700093 ER PT J AU SOUTHON, JR BISHOP, MS KOST, GJ AF SOUTHON, JR BISHOP, MS KOST, GJ TI CA-41 AS A TRACER FOR CALCIUM-UPTAKE AND DEPOSITION IN HEART-TISSUE DURING ISCHEMIA AND REPERFUSION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA ID INJURY; AMS; ION AB We have developed techniques and are commencing experiments using enriched Ca-41 as a tracer in isolated rabbit heart preparations. The aims of the study are to measure calcium uptake and deposition in response to cardiac ischemia and reperfusion, and to investigate events and mechanisms leading to irreversible myocyte injury. C1 UNIV CALIF DAVIS,DEPT MED PATHOL & BIOMED ENGN,DAVIS,CA 95616. RP SOUTHON, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR AMS,L397,LIVERMORE,CA 94550, USA. NR 11 TC 8 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 489 EP 491 DI 10.1016/0168-583X(94)96060-7 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700099 ER PT J AU SISTERSON, JM JULL, AJT BEVERDING, A KOEHLER, AM CASTANEDA, C VINCENT, J DONAHUE, DJ ENGLERT, PAJ GANS, C YOUNG, J REEDY, RC AF SISTERSON, JM JULL, AJT BEVERDING, A KOEHLER, AM CASTANEDA, C VINCENT, J DONAHUE, DJ ENGLERT, PAJ GANS, C YOUNG, J REEDY, RC TI PROTON PRODUCTION CROSS-SECTIONS FOR C-14 FROM SILICON AND OXYGEN - IMPLICATIONS FOR COSMIC-RAY STUDIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 6th International Conference on Accelerator Mass Spectrometry (AMS-6) CY SEP 27-OCT 01, 1993 CL CANBERRA, AUSTRALIA SP ALPHATECH INT, NEW ZEALAND, APPLICAT NUCL PHYS, ANSTO, SYDNEY, AUSTR TOURIST COMMISS, CRYOLAB, AUSTR, CSIRO, DIV EXPLORAT & MINING, SYDNEY, DEPT IND TRADE & COMMERCE AUSTR, AUSTR NATL UNIV, DEPT NUCL PHYS, CANBERRA, DIGITAL EQUIPMENT CORP, AUSTR, EG&G ORTEC NUCLETRON, AUSTR, HIGH VOLTAGE ENGN EUROPA BV, MICRO ANAL RES CTR, MELBOURNE, NATL ELECTROSTAT CORP, USA AB The production rates of C-14 from proton spallation of silicon and oxygen have been measured over a wide range of energies from 31 to 450 MeV. C-14 was measured by accelerator mass spectrometry (AMS) after extraction of carbon from the samples by melting in a flow of oxygen. C1 UNIV ARIZONA,NSF ARIZONA ACCELERATOR MASS SPECTROMETER FACIL,TUCSON,AZ 85721. HARVARD UNIV,HARVARD CYCLOTRON LAB,CAMBRIDGE,MA 02138. SAN JOSE STATE UNIV,DEPT CHEM,SAN JOSE,CA 95192. UNIV CALIF DAVIS,CROCKER NUCL LAB,DAVIS,CA 95616. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. CHICO STATE UNIV,DEPT PHYS,CHICO,CA 95929. LOS ALAMOS NATL LAB,GRP SST9,LOS ALAMOS,NM 87545. NR 15 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 92 IS 1-4 BP 510 EP 512 DI 10.1016/0168-583X(94)96064-X PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV547 UT WOS:A1994NV54700103 ER PT J AU WEBER, WJ WANG, LM AF WEBER, WJ WANG, LM TI EFFECT OF TEMPERATURE AND RECOIL-ENERGY SPECTRA ON IRRADIATION-INDUCED AMORPHIZATION IN CA2LA8(SIO4)6O2 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID CA2ND8(SIO4)6O2; DEPENDENCE AB Single crystals of Ca2La8(SiO4)6O2 have been irradiated with different ions/energies in an in-situ study of the effects of temperature and recoil-energy spectra on irradiation-induced amorphization. The dose for complete amorphization (approximately 0.36 dpa) is independent of recoil-energy spectra at 15 K and-increases with temperature in two stages. The low-temperature stage (below approximately 200 K) has an activation energy of 0.01 +/- 0.003 eV and may be associated with simultaneous close-pair recombination. The high-temperature stage (above approximately 200 K) has an activation energy of 0. 13 +/- 0.02 eV and may be associated with irradiation-enhanced defect mobility. The critical temperature for amorphization increases from approximately 360 K for 0.8 MeV Ne+ to approximately 710 K for 1.5 MeV Kr+. The amorphization dose increases more rapidly with temperature for Ne+ due to the larger fraction of recoverable defects produced by the low energy recoils. C1 UNIV NEW MEXICO, DEPT EARTH & PLANETARY SCI, ALBUQUERQUE, NM 87131 USA. RP WEBER, WJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Weber, William/A-4177-2008 OI Weber, William/0000-0002-9017-7365 NR 13 TC 59 Z9 60 U1 3 U2 9 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 1994 VL 91 IS 1-4 BP 63 EP 66 DI 10.1016/0168-583X(94)96191-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500009 ER PT J AU ZINKLE, SJ AF ZINKLE, SJ TI MICROSTRUCTURE OF ION-IRRADIATED CERAMIC INSULATORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID MAGNESIUM ALUMINATE SPINEL; RADIATION-DAMAGE; ELECTRON-IRRADIATION; DISPLACEMENT; AL2O3; ALPHA-AL2O3; BOMBARDMENT; COMPACTION; MGAL2O4 AB Cross-section transmission electron microscopy was utilized to examine the radiation-induced microstructural changes in Al2O3, MgO, Si3N4 and MgAl2O4 after irradiation with a wide variety of energetic ion beams. The relative influence of ionizing and displacive radiation was studied by systematically varying the mass and energy of the bombarding ions between 1 MeV H+ and 4 MeV Zr3+ ions. The measured ion ranges were between 1 and 15% greater than the ranges calculated by the TRIM code, with the largest discrepancies occurring for intermediate mass ions. The implanted ions exerted a strong influence on the overall microstructural evolution of the irradiated ceramics. Numerous microstructural features (e.g., amorphization, colloids) were produced in the implanted ion regions which could not be produced in irradiated regions that were well separated from the implanted ions. The microstructural evolution in regions welt separated from the implanted ions was found to depend strongly on the mass and energy of the bombarding ion. Light ion irradiation produced a significant enhancement in point defect diffusion (evidenced by defect free zones at the surface and adjacent to internal defect sinks) compared to heavy ion irradiation at the same damage rate. Similarly, irradiation with a given ion at a higher flux generally produced an increased amount of observable diffusion. In some cases such as 1 MeV proton irradiation, observable defect clusters did not form. This suppression in defect cluster formation may be due to the high amount of point defect recombination associated with ionization enhanced diffusion that occurs during energetic light ion irradiation. RP ZINKLE, SJ (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 42 TC 115 Z9 115 U1 6 U2 36 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 1994 VL 91 IS 1-4 BP 234 EP 246 DI 10.1016/0168-583X(94)96224-3 PG 13 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500042 ER PT J AU EVANS, BD POGATSHNIK, GJ CHEN, Y AF EVANS, BD POGATSHNIK, GJ CHEN, Y TI OPTICAL-PROPERTIES OF LATTICE-DEFECTS IN ALPHA-AL2O3 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID SINGLE-CRYSTAL AL2O3; F+ CENTERS; ALPHA-ALUMINA; COLOR-CENTERS; LUMINESCENCE; SAPPHIRE; OXIDE AB Experimental optical properties of lattice vacancy defects in single crystal alpha-Al2O3 are reviewed. Specific ultraviolet absorption and luminescence bands are associated with F-type centers. Following extended exposures to epithermal neutron sources, photobleaching and anisotropic properties allowed the association of several of.the visible and near infrared bands with F2-type centers. Photoconductivity, photostability and charge state considerations provided tentative placement of defect energy levels with respect to the conduction band edge. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. SO ILLINOIS UNIV,DEPT PHYS,EDWARDSVILLE,IL 62026. RP EVANS, BD (reprint author), BOEING DEF & SPACE GRP,POB 3999,MS 9E-XW,SEATTLE,WA 98124, USA. NR 35 TC 95 Z9 97 U1 5 U2 23 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 1994 VL 91 IS 1-4 BP 258 EP 262 DI 10.1016/0168-583X(94)96227-8 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500045 ER PT J AU CAO, DX SOOD, DK BROWN, IG AF CAO, DX SOOD, DK BROWN, IG TI THERMAL ANNEALING OF SINGLE-CRYSTAL ZIRCONIA IMPLANTED WITH PLATINUM IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB Single crystal samples of (100) oriented cubic zirconia stabilised with 9.5 mol% yttria were implanted with platinum ions, using a metal vapour vacuum arc (MEVVA) high current ion implanter, to a nominal dose of 1 X 10(17) ionS/CM2 . The implanted samples were annealed isothermally in air ambient at 400-1200-degrees-C, from 1 to 24 h. Rutherford backscattering spectrometry and channelling (RBSC) of 2 MeV He ions are employed to determine depth distributions of ion damage, Pt ions and substitutionality of Pt ions before and after annealing. As implanted samples do not show an amorphous phase, the retained dose is small, about 35% of the nominal dose, and the Pt depth profiles are sputter limited. Ion damage begins to anneal at 400-degrees-C and eventually recovers quite well at 1200-degrees-C, leading to the formation of partially coherent precipitates of Pt. Platinum shows a solid solubility of at least 13 mol.% in zirconia at 1200-degrees-C. At lower anneal temperatures, cubic zirconia may have transformed to monoclinic or tetragonal phases. C1 LAWRENCE BERKELEY LAB, DIV ACCLERATOR & FUSION RES, BERKELEY, CA 94720 USA. RP CAO, DX (reprint author), ROYAL MELBOURNE INST TECHNOL, CTR MICROELECTR & MAT TECHNOL, 124 LA TROBE ST, MELBOURNE 3000, AUSTRALIA. NR 10 TC 6 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 91 IS 1-4 BP 280 EP 283 DI 10.1016/0168-583X(94)96231-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500049 ER PT J AU MAZZOLDI, P ARNOLD, GW BATTAGLIN, G BERTONCELLO, R GONELLA, F AF MAZZOLDI, P ARNOLD, GW BATTAGLIN, G BERTONCELLO, R GONELLA, F TI PECULIARITIES AND APPLICATION PERSPECTIVES OF METAL-ION IMPLANTS IN GLASSES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID NONLINEAR-OPTICAL-PROPERTIES; ALUMINA-SILICA GLASS; FUSED-SILICA; SIO2 GLASS; CHEMICAL INTERACTIONS; PHOSPHORUS COLLOIDS; PHASE CONJUGATION; PARTICLES; SEMICONDUCTOR; OXYNITRIDE AB Ion implantation in insulators causes modifications in the refractive index as a result of radiation damage, phase separation, or compound formation. As a consequence, light waveguides may be formed with interesting applications in the field of optoelectronics. Recently implantation of metals ions (e.g. silver, copper, gold, lead, etc.) showed the possibility of small radii colloidal particles formation in a thin surface layer of the glass substrate. These particles exhibit an electron plasmon resonance which depends on the optical constants of the implanted metal and on the refractive index of the glass host. The non-linear optical properties of such colloids, in particular the enhancement of optical Kerr susceptibility, suggest that the ion implantation technique may play an important role for the production of all-optical switching devices. In this paper an analysis of the state-of-the-art of the research in this field will be presented in the framework of ion implantation in glass physics and chemistry. C1 UNITA CONSORZIO INTERUNIV NAZL FIS MAT,DIPARTIMENTO CHIM FIS,I-30123 VENICE,ITALY. DIPARTIMENTO CHIM INORGAN MET ORGAN & ANALIT,I-35131 PADUA,ITALY. SANDIA NATL LABS,DEPT 1111,ALBUQUERQUE,NM 87185. RP MAZZOLDI, P (reprint author), UNITA CONSORZIO INTERUNIV NAZL FIS MAT,DIPARTIMENTO FIS,VIA MARZOLO 8,I-35131 PADUA,ITALY. RI Gonella, Francesco/F-6008-2014; Bertoncello, Renzo/D-8132-2017; Battaglin, Giancarlo/H-7792-2015 OI Gonella, Francesco/0000-0001-8504-5301; Bertoncello, Renzo/0000-0003-2090-9310; Battaglin, Giancarlo/0000-0003-1380-4465 NR 86 TC 127 Z9 127 U1 1 U2 9 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 1994 VL 91 IS 1-4 BP 478 EP 492 DI 10.1016/0168-583X(94)96273-1 PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500091 ER PT J AU HAGLUND, RF YANG, L MAGRUDER, RH WHITE, CW ZUHR, RA YANG, L DORSINVILLE, R ALFANO, RR AF HAGLUND, RF YANG, L MAGRUDER, RH WHITE, CW ZUHR, RA YANG, L DORSINVILLE, R ALFANO, RR TI NONLINEAR-OPTICAL PROPERTIES OF METAL-QUANTUM-DOT COMPOSITES SYNTHESIZED BY ION-IMPLANTATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID REFRACTIVE-INDEX; FUSED-SILICA; SINGLE-BEAM; WAVE-GUIDES; ABSORPTION; GLASSES; PARTICLES; LASER; SEMICONDUCTOR; ENHANCEMENT AB Over a decade ago, it was demonstrated that composites comprising metal clusters embedded in dielectric hosts could be synthesized by ion implantation. The optical properties of these metal-cluster composites are dominated by two phenomena which alter the susceptibilities from those of bulk metals: One is a classical field enhancement effect, dielectric confinement, which leads to the characteristic surface plasmon resonance of the metal clusters seen in absorption spectra. The other effect is quantum confinement of the conduction-band electrons which enhances the nonlinear susceptibility of the metal clusters for diameters smaller than about 10 nm and makes them behave as quantum dots with electronic properties which approximate those of independent electrons confined in a spherical potential well. This paper reviews our studies of the nonlinear optical behavior of quantum-dot composites synthesized by ion implantation. We also consider the potential of these quantum-dot composites as materials for nonlinear waveguide devices. C1 VANDERBILT UNIV,DEPT MAT SCI & ENGN,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,DIV SOLID STATE PHYS,SURFACE MODIFICAT & CHARACTERIZAT FACIL,OAK RIDGE,TN 37831. CUNY,DEPT PHYS,ULTRAFAST LASER SPECTROSCOPY LAB,NEW YORK,NY 10031. CUNY,DEPT ELECT ENGN,NEW YORK,NY 10031. RP HAGLUND, RF (reprint author), VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235, USA. NR 69 TC 151 Z9 151 U1 2 U2 16 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 1994 VL 91 IS 1-4 BP 493 EP 504 DI 10.1016/0168-583X(94)96274-X PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500092 ER PT J AU MAZZOLDI, P CACCAVALE, F CATTARUZZA, E CHAKRABORTY, P TRAMONTIN, L BOSCOLOBOSCOLETTO, A BERTONCELLO, R TRIVILLIN, F BATTAGLIN, G ARNOLD, GW AF MAZZOLDI, P CACCAVALE, F CATTARUZZA, E CHAKRABORTY, P TRAMONTIN, L BOSCOLOBOSCOLETTO, A BERTONCELLO, R TRIVILLIN, F BATTAGLIN, G ARNOLD, GW TI COLLOID FORMATION IN COPPER-IMPLANTED FUSED-SILICA AND SILICATE-GLASSES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP AB Copper implantations (90 keV, 5 x 10(16) ionS/CM2) were made into fused silica, borosilicate glasses and soda-lime glass. The copper distribution has been found to vary according to glass type. The optical absorption band characteristic of the implanted metal optical properties was observed only for copper-implanted fused silica. The absorption for all the other samples was either not observable or was negligibly small, however very small metallic particles are present also in the soda-lime glass. A subsequent nitrogen implantation (100 keV, 1.5 x 10(17) ions/cm2) completely eliminated the copper-colloid induced absorption in the copper-implanted fused silica, while it facilitated the formation of copper-colloids.into the soda-lime glass. C1 DIPARTIMENTO INGN ELETT,I-35131 PADUA,ITALY. ENICHEM,I-30175 PORTO MARGHERA,ITALY. DIPARTIMENTO CHIM ORGAN MET ORGAN & ANALIT,I-35131 PADUA,ITALY. DIPARTIMENTO CHIM FIS,I-30123 VENICE,ITALY. SANDIA NATL LABS,DEPT 1111,ALBUQUERQUE,NM 87185. SAHA INST NUCL PHYS,CALCUTTA 700064,INDIA. RP MAZZOLDI, P (reprint author), DIPARTIMENTO FIS,VIA MARZOLO 8,I-35131 PADUA,ITALY. RI Cattaruzza, Elti/A-7304-2008; Bertoncello, Renzo/D-8132-2017; Battaglin, Giancarlo/H-7792-2015 OI Cattaruzza, Elti/0000-0003-0643-0266; Bertoncello, Renzo/0000-0003-2090-9310; Battaglin, Giancarlo/0000-0003-1380-4465 NR 10 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 91 IS 1-4 BP 505 EP 509 DI 10.1016/0168-583X(94)96275-8 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500093 ER PT J AU MCHARGUE, CJ JOSLIN, DL WHITE, CW AF MCHARGUE, CJ JOSLIN, DL WHITE, CW TI ION-BEAM MIXING IN INSULATOR SUBSTRATES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID ENHANCED ADHESION; METAL-FILMS; SIO2; INTERFACES AB Studies of ion beam mixing involving insulator substrates is reviewed with an emphasis on thermodynamical and thermochemical considerations. Such studies generally have employed the bi-layer configuration of metal/insulator combinations. There is little evidence for long-range material transport. In the case of sapphire (single crystal Al2O3) substrates, only recoil mixing has been detected for both metal and oxide films irradiated at room temperature. ''Demixing'' of recoil-implanted cations is indicated at temperatures of 825-900-degrees-C. Agglomeration of non-wetting metal films suggests that surface diffusion occurs under the influence of the ion beam. Ballistic mixing has been reported for metal films on SiC, Si3N4 and SiO2. Ion beam-induced reactions are observed at the interfaces for systems in which the enthalpy of reaction is favorable. There is evidence that chemical effects in the cascade mixing regime determine the phases present in the mixed zone. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP MCHARGUE, CJ (reprint author), UNIV TENNESSEE, KNOXVILLE, TN 37996 USA. NR 51 TC 29 Z9 29 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 1994 VL 91 IS 1-4 BP 549 EP 557 DI 10.1016/0168-583X(94)96284-7 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500102 ER PT J AU COOPER, EA NASTASI, M AF COOPER, EA NASTASI, M TI ION-BEAM MIXING OF MARKER LAYERS INTO AMORPHOUS ALUMINUM-OXIDE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP AB Thin layers of various marker species embedded in amorphous Al2O3 were ion beam mixed with 210 keV Ar in a temperature range of -166-degrees-C to 790-degrees-C. All of the metal markers (Ag, Fe, and Zr) were found to mix only to a ballistic level. The oxide markers studied were Fe2O3, Cr2O3, Y2O3, and ZrO2. Thermally assisted ion mixing was seen, in decreasing amounts, in Fe2O3, Y203, and Cr2O3. No thermally assisted ion beam mixing was observed for ZrO2 or the metal markers. RP COOPER, EA (reprint author), LOS ALAMOS NATL LAB,DIV MAT,LOS ALAMOS,NM 87545, USA. NR 12 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 91 IS 1-4 BP 558 EP 561 DI 10.1016/0168-583X(94)96285-5 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500103 ER PT J AU JOSLIN, DL MCHARGUE, CJ WHITE, CW EVANS, ND AF JOSLIN, DL MCHARGUE, CJ WHITE, CW EVANS, ND TI AMORPHIZATION OF SAPPHIRE DURING ION-BEAM MIXING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP AB Earlier studies indicated that implantation of zirconium into sapphire at room temperature produced an amorphous layer at a critical composition of approximately 6.5% (cation). Further insight into the amorphization of sapphire has been provided by ion beam mixing studies. Bi-layer couples of approximately 80 nm thick polycrystalline ZrO2 films deposited on the (0001) face of alpha-Al2O3 single crystals were irradiated to 4 x 10(16) ions/cm2 with Kr (475 keV, 20-degrees-C) or Cr (340 keV, 20-degrees-C or approximately 900-degrees-C). Transmission electron microscopy showed the unirradiated couples to have sharp, planar interfaces between the films and substrates. Recoil mixing by both ion species gave Zr concentrations greater than 10% (cation) to depths of 10-20 nm. An amorphous layer containing Zr was present at the interface for samples irradiated at room temperature. The sample mixed at the elevated temperature contained a sharp interface similar to the as-deposited sample. The present results suggest that both irradiation-produced damage (defects) and certain chemical species are required to amorphize sapphire. C1 OAK RIDGE INST SCI & EDUC,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP JOSLIN, DL (reprint author), UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996, USA. RI Evans, Neal/F-5955-2011 NR 6 TC 9 Z9 9 U1 0 U2 5 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 1994 VL 91 IS 1-4 BP 562 EP 565 DI 10.1016/0168-583X(94)96286-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500104 ER PT J AU JOSLIN, DL MCHARGUE, CJ WHITE, CW AF JOSLIN, DL MCHARGUE, CJ WHITE, CW TI ION MIXING IN OXIDE-SAPPHIRE SYSTEMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID BILAYERS AB Ion beam mixing of thin oxide films on sapphire substrates has been studied in order to examine any role of equilibrium thermodynamic parameters on the mixing process. Mixing experiments were performed with polycrystalline oxide films deposited on single crystalline alpha-Al2O3 substrates. According to the equilibrium phase diagrams, Cr2O3 is completely soluble in alpha-Al2O3, while ZrO2 is insoluble. The couples were irradiated with Cr ions (160 and 340 keV) or Kr ions to fluences of 4 x 10(16) ions/cm2 at temperatures between 20 and 900-degrees-C. Rutherford backscattering spectrometry, X-ray photoelectron spectroscopy, and transmission electron microscopy were used to analyze samples before and after irradiation to determine the extent and nature of interface modifications. No long-range mixing was detected under any condition studied; the width of the ''mixed'' region in each case was consistent with recoil mixing. The absence of long-range mixing is rationalized in terms of the different ranges of oxygen ions and cations. RP JOSLIN, DL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 19 TC 3 Z9 3 U1 1 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 1994 VL 91 IS 1-4 BP 566 EP 570 DI 10.1016/0168-583X(94)96287-1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500105 ER PT J AU CHASE, LL AF CHASE, LL TI PUMP-PROBE METHOD FOR INVESTIGATING LASER-ABLATION AND OPTICAL-DAMAGE THRESHOLD MECHANISMS IN OPTICAL-MATERIALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID PULSES; PAIRS; EXCITATION AB A pump-probe method involving pairs of picosecond laser pulses is employed to investigate physical mechanisms leading to laser ablation and optical damage to surfaces. Data obtained for two typical optical materials, a borosilicate optical glass and single crystal ZnS, are compared with ablation mechanisms based on the intrinsic absorption processes, two photon absorption and free carrier absorption. The double-pulse method is shown to yield important new information concerning the mechanism of laser-surface interaction and the lifetimes of the excitations produced by these interactions. RP CHASE, LL (reprint author), LAWRENCE LIVERMORE NATL LAB,L-357,POB 808,LIVERMORE,CA 94550, USA. NR 9 TC 1 Z9 1 U1 2 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 1994 VL 91 IS 1-4 BP 597 EP 600 DI 10.1016/0168-583X(94)96294-4 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500112 ER PT J AU MEGGERS, K PRIESMEYER, HG TRELA, WJ BOWMAN, CD DAHMS, M AF MEGGERS, K PRIESMEYER, HG TRELA, WJ BOWMAN, CD DAHMS, M TI REAL-TIME NEUTRON TRANSMISSION INVESTIGATION OF THE AUSTENITE BAINITE TRANSFORMATION IN GREY IRON SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB The first successful application of a new method to investigate phase transformations in real time, like the decomposition of austenite into bainite in grey iron, is described. During the ongoing transformation, transmission spectra of thermal neutrons, which contain Bragg edges corresponding to the crystal structure of the transforming phases, are recorded. By evaluating the height of these Bragg edges, which is a measure of the volume fraction of the phase, at different transformation times, the transformation can be followed in-situ in a time resolved manner. The method is compared to other previously used methods (micrographs, dilatometry, diffraction techniques); also a summary and an outlook are given. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. GKSS FORSCHUNGSZENTRUM GEESTHACHT GMBH,D-21502 GEESTHACHT,GERMANY. RP MEGGERS, K (reprint author), CHRISTIAN ALBRECHTS UNIV KIEL,INST NUCL PHYS,D-24118 KIEL,GERMANY. NR 19 TC 6 Z9 6 U1 1 U2 4 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 1994 VL 88 IS 4 BP 423 EP 429 DI 10.1016/0168-583X(94)95394-5 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NT249 UT WOS:A1994NT24900013 ER PT J AU JAHSHAN, SN MCGEEHAN, TJ AF JAHSHAN, SN MCGEEHAN, TJ TI AN EVALUATION OF THE DEPLOYMENT OF AIROX-RECYCLED FUEL IN PRESSURIZED-WATER REACTORS SO NUCLEAR TECHNOLOGY LA English DT Article DE RECYCLED FUEL; WEAPONS PLUTONIUM DISPOSITION; PWR IN-CORE PERFORMANCE ID MIXED-OXIDE FUEL; PERFORMANCE; MANAGEMENT; EXPERIENCE AB An analytical evaluation is made of the pressurized water reactor (PWR) in-core performance of recycled light water reactor fuel that has been Atomics International reduction oxidation (AIROX) reprocessed and reenriched with fissile materials. The neutronics performance is shown to lie within the neutronics performance of existing high-performance and high-burnup fuels. Three AIROX-recycled fuels are compared with a high-burnup virgin fuel and an equivalent mixed-oxide (MOX) fuel. The AIROX-recycled fuel neutronics performance lies consistently between the virgin and the MOX fuel for both the pin power peaking and the reactivity response characteristics in PWRs. Among the attractive features of AIROX-recycled fuel is that it can optimize fissile and fertile fuel use, minimize final fuel disposal impact on the environment, and provide energy in the process of denaturing weapons-grade fissile materials. The fuel material performance may be anticipated from high-burnup virgin fuel and from MOX fuel performance. Recommendations for lead rod testing and for optimization of the AIROX-processing and resintering techniques are made. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV FLORIDA,CTR NUCL SCI,DEPT NUCL ENGN SCI,GAINESVILLE,FL 32611. NR 15 TC 6 Z9 6 U1 1 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1994 VL 106 IS 3 BP 350 EP 359 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NN836 UT WOS:A1994NN83600009 ER PT J AU NGUYEN, DH AF NGUYEN, DH TI TRANSPORT PHENOMENA AND OCCUPATIONAL CONSEQUENCES OF A TRITIUM RELEASE SO NUCLEAR TECHNOLOGY LA English DT Article DE TRITIUM RELEASE CONSEQUENCES; GASEOUS BACK-DIFFUSION; ACCIDENT ANALYSIS AB Tritium gas, normally in sealed containers, will be present in the U.S. Department of Energy's (DOE's) facilities conducting fusion energy research. A probability of tritium release, however small, exists in these facilities. Once released, tritium can back diffuse against ventilation flow to contaminate other areas of the facility. Tritium can also be released to the environment by exhaust blowers. The problem of back-diffusion of tritium released in a typical DOE facility was examined as a function of flow rates of the ventilation system. The source term (release to the environment) in the emergency ventilation flow was also calculated. The consequences to personnel in the release room and in an adjacent corridor due to back-diffusion were determined. It was shown that for credible release scenarios, the consequences in the adjacent corridor from tritium back-diffusion were negligible. Higher doses in the release room can be avoided by well-planned emergency evacuation procedures. The source term was calculated, but the on- and off-site consequences were not determined. RP NGUYEN, DH (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUN PY 1994 VL 106 IS 3 BP 360 EP 372 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NN836 UT WOS:A1994NN83600010 ER PT J AU PASAMEHMETOGLU, KO AF PASAMEHMETOGLU, KO TI NUMERICAL MODELING OF A NUCLEATE BOILING SURFACE SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article ID HEAT-TRANSFER; POOL AB A computer program developed to analyze nucleate boiling over a heated surface is described. The model solves the three-dimensional transient conduction equation within the heater. The conduction solution is coupled with closure relationships to mimic the bubble dynamics and the associated heat transfer coefficients. Sample problems are run using a copper surface subject to partial nucleate boiling in saturated water at atmospheric pressure. The results are shown to be in good qualitative agreement with the pertinent experimental observations. RP PASAMEHMETOGLU, KO (reprint author), LOS ALAMOS NATL LAB,DIV NUCL TECHNOL & ENGN,LOS ALAMOS,NM 87545, USA. NR 20 TC 4 Z9 5 U1 0 U2 1 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD JUN PY 1994 VL 25 IS 6 BP 703 EP 719 DI 10.1080/10407789408955974 PG 17 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA NR680 UT WOS:A1994NR68000005 ER PT J AU ARMAN, B RABAS, TJ AF ARMAN, B RABAS, TJ TI 2-LAYER-MODEL PREDICTIONS OF HEAT-TRANSFER INSIDE ENHANCED TUBES SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article ID TRANSFER AUGMENTATION; TURBULENCE MODELS; WALL TURBULENCE; NEAR-WALL; CHANNEL; FLOWS AB Turbulent flow in axisymmetric enhanced tubes with repeated transverse rectangular disruptions was simulated using the two-layer turbulence model of Chen and Patel [1]. The predictions were in good agreement with experimental data for friction factors and both local and average Nusselt numbers. The low-Reynolds-number two-equation model of Lam and Bremhorst [2] was considered, and the predicted results were also compared with local heat transfer measurements. This model overestimated the local Nusselt numbers at some locations by about a factor of 2. Results from the two turbulence models were also compared for a sudden pipe-expansion geometry. The Lam and Bremhorst model yielded acceptable local Nusselt number predictions, while the Chen and Patel model underpredicted the local Nusselt numbers and predicted the location of the heat transfer maximum further upstream. RP ARMAN, B (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 34 TC 8 Z9 11 U1 0 U2 1 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD JUN PY 1994 VL 25 IS 6 BP 721 EP 741 DI 10.1080/10407789408955975 PG 21 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA NR680 UT WOS:A1994NR68000006 ER PT J AU BALDWIN, GC SOLEM, JC AF BALDWIN, GC SOLEM, JC TI THE FUTILITY OF OBSERVING STIMULATED GAMMA-RAY EMISSION FROM A LONG-LIVED ISOMERIC STATE SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS LA English DT Note AB We reveal the fallacies in recent gamma-ray laser schemes that propose to obtain gain by stimulating transitions from a long-lived upper to a short-lived lower nuclear state. We point out the errors in recent derivations of the stimulated-emission coefficients, derive the correct formulae, and submit an alternative explanation for an experiment purported to observe stimulated emission from a long-lived isomer. RP BALDWIN, GC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 0392-6737 J9 NUOVO CIMENTO D JI Nuovo Cimento Soc. Ital. Fis. D-Condens. Matter At. Mol. Chem. Phys. Fluids Plasmas Biophys. PD JUN PY 1994 VL 16 IS 6 BP 627 EP 630 DI 10.1007/BF02451661 PG 4 WC Physics, Multidisciplinary SC Physics GA PZ240 UT WOS:A1994PZ24000011 ER PT J AU WATANABE, KH BOIS, FY DAISEY, JM AUSLANDER, DM SPEAR, RC AF WATANABE, KH BOIS, FY DAISEY, JM AUSLANDER, DM SPEAR, RC TI BENZENE TOXICOKINETICS IN HUMANS - EXPOSURE OF BONE-MARROW TO METABOLITES SO OCCUPATIONAL AND ENVIRONMENTAL MEDICINE LA English DT Article ID RISK ASSESSMENT; PHARMACOKINETIC MODEL; OCCUPATIONAL EXPOSURE; ORGANIC-SOLVENTS; CIGARETTE-SMOKE; ETHYL ACETATE; N-HEXANE; TOLUENE; BREATH; TRICHLOROETHYLENE AB A three compartment physiologically based toxicokinetic model was fitted to human data on benzene disposition. Two separate groups of model parameter derivations were obtained, depending on which data sets were being fitted. The model was then used to simulate five environmental or occupational exposures. Predicted values of the total bone marrow exposure to benzene and cumulative quantity of metabolites produced by the bone marrow were generated for each scenario. The relation between cumulative quantity of metabolites produced by the bone marrow and continuous benzene exposure was also investigated in detail for simulated inhalation exposure concentrations ranging from 0.0039 ppm to 150 ppm. At the level of environmental exposures, no dose rate effect was found for either model. The occupational exposures led to only slight dose rate effects. A 32 ppm exposure for 15 minutes predicted consistently higher values than a 1 ppm exposure for eight hours for the total exposure of bone marrow to benzene and the cumulative quantity of metabolites produced by the bone marrow. The general relation between the cumulative quantity of metabolites produced by the bone marrow and the inhalation concentration of benzene is not linear. An inflection point exists in some cases leading to a slightly S shaped curve. At environmental levels (0.0039-10 ppm) the curve bends upward, and it saturates at high experimental exposures (greater than 100 ppm). C1 LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,MAIL STOP 90-3058,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SCH PUBL HLTH,BERKELEY,CA 94720. RI Bois, Frederic/E-9241-2012 OI Bois, Frederic/0000-0002-4154-0391 FU NIEHS NIH HHS [NIEHS P42 ES04705-06] NR 34 TC 15 Z9 15 U1 0 U2 2 PU BRITISH MED JOURNAL PUBL GROUP PI LONDON PA BRITISH MED ASSOC HOUSE, TAVISTOCK SQUARE, LONDON, ENGLAND WC1H 9JR SN 1351-0711 J9 OCCUP ENVIRON MED JI Occup. Environ. Med. PD JUN PY 1994 VL 51 IS 6 BP 414 EP 420 PG 7 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA NQ598 UT WOS:A1994NQ59800009 PM 8044234 ER PT J AU MULHOLLAND, PJ STEINMAN, AD MARZOLF, ER HART, DR DEANGELIS, DL AF MULHOLLAND, PJ STEINMAN, AD MARZOLF, ER HART, DR DEANGELIS, DL TI EFFECT OF PERIPHYTON BIOMASS ON HYDRAULIC CHARACTERISTICS AND NUTRIENT CYCLING IN STREAMS SO OECOLOGIA LA English DT Article DE STREAM PERIPHYTON; NUTRIENT CYCLING STREAM HYDRAULICS; TRANSIENT STORAGE ZONES ID TRANSIENT STORAGE; DESERT STREAM; SOLUTE TRANSPORT; 3RD-ORDER STREAM; WOODLAND STREAM; RETENTION; DYNAMICS; COMMUNITIES; SUCCESSION; SEDIMENT AB The effect of periphyton biomass on hydraulic characteristics and nutrient cycling was studied in laboratory streams with and without snail herbivores. Hydraulic characteristics, such as average water velocity, dispersion coefficients, and relative volume of transient storage zones (zones of stationary water), were quantified by performing short-term injections of a conservative tracer and fitting an advection-dispersion model to the conservative tracer concentration profile downstream from the injection site. Nutrient cycling was quantified by measuring two indices: (1) uptake rate of phosphorus from stream water normalized to gross primary production (GPP), a surrogate measure of total P demand, and (2) turnover rate of phosphorus in the periphyton matrix. These measures indicate the importance of internal cycling (within the periphyton matrix) in meeting the P demands of periphyton. Dense growths of filamentous diatoms and blue-green algae accumulated in the streams with no snails (high-biomass streams), whereas the periphyton communities in streams with snails consisted almost entirely of a thin layer of basal cells of Stigeoclonium sp. (low-biomass streams). Dispersion coefficients were significantly greater and transient storage zones were significantly larger in the high-biomass. streams compared to the low-biomass streams. Rates of GPP-normalized P uptake from water and rates of P turnover in periphyton were significantly lower in high biomass than in low biomass periphyton communities, suggesting that a greater fraction of the P demand was met by recycling in the high biomass communities. Increases in streamwater P concentration significantly increased GPP-normalized P uptake in high biomass communities, suggesting diffusion limitation of nutrient transfer from stream water to algal cells in these communities. Our results demonstrate that accumulations of periphyton biomass can alter the hydraulic characteristics of streams, particularly by increasing transient storage zones, and can increase internal nutrient cycling. They suggest a close coupling of hydraulic characteristics and nutrient cycling processes in stream ecosystems. C1 S FLORIDA WATER MANAGEMENT DIST,DEPT RES,W PALM BEACH,FL 33416. KNOX COLL,DEPT MATH & COMP SCI,GALESBURG,IL 61401. RP MULHOLLAND, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Mulholland, Patrick/C-3142-2012; OI Steinman, Alan/0000-0002-4886-4305 NR 33 TC 87 Z9 92 U1 5 U2 28 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0029-8549 J9 OECOLOGIA JI Oecologia PD JUN PY 1994 VL 98 IS 1 BP 40 EP 47 DI 10.1007/BF00326088 PG 8 WC Ecology SC Environmental Sciences & Ecology GA NR696 UT WOS:A1994NR69600006 PM 28312794 ER PT J AU MULVEY, M AHO, JM RHODES, OE AF MULVEY, M AHO, JM RHODES, OE TI PARASITISM AND WHITE-TAILED DEER - TIMING AND COMPONENTS OF FEMALE REPRODUCTION SO OIKOS LA English DT Article ID POPULATION INTERACTIONS; INFECTIOUS-DISEASES; FASCIOLOIDES-MAGNA; HOST; STABILITY; SURVIVAL; BIOLOGY; SUCCESS; HERD AB Traits contributing to reproductive success in female white-tailed deer were evaluated for uninfected and liver fluke-infected individuals on the Savannah River Site, South Carolina, USA. Mean body weight for fluke-infected females was significantly greater than for uninfected individuals for all habitat-age classes examined. Conception dates for fluke-infected females were significantly earlier than those for uninfected females in two habitat types. There was a trend for larger proportions of single offspring in fluke-infected females. Condition values (kidney fat index) of infected females were lower than those of non-infected females. RP MULVEY, M (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 34 TC 13 Z9 13 U1 1 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0030-1299 J9 OIKOS JI Oikos PD JUN PY 1994 VL 70 IS 2 BP 177 EP 182 DI 10.2307/3545628 PG 6 WC Ecology SC Environmental Sciences & Ecology GA NP944 UT WOS:A1994NP94400001 ER PT J AU LASSAHN, GD LASSAHN, JK TAYLOR, PL DEASON, VA AF LASSAHN, GD LASSAHN, JK TAYLOR, PL DEASON, VA TI MULTIPHASE FRINGE ANALYSIS WITH UNKNOWN PHASE-SHIFTS SO OPTICAL ENGINEERING LA English DT Article DE ALGORITHMS ID INTERFEROMETRY AB We present methods for determining the phase shifts in multiphase fringe analysis from the fringe image data itself, thus eliminating the requirement for prior knowledge or accurate control of the phase shifts. We also discuss methods for calculating the folded (wrapped) and unfolded phases. and quote the accuracy of the fringe analysis method for an example in which the correct result is known. RP LASSAHN, GD (reprint author), EG&G IDAHO INC,POB 1625,IDAHO FALLS,ID 83415, USA. NR 4 TC 45 Z9 46 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUN PY 1994 VL 33 IS 6 BP 2039 EP 2044 DI 10.1117/12.169728 PG 6 WC Optics SC Optics GA NR248 UT WOS:A1994NR24800048 ER PT J AU POLITOV, VY LOBODA, PA LYKOV, VA NILSEN, J AF POLITOV, VY LOBODA, PA LYKOV, VA NILSEN, J TI A 64-ANGSTROM NE-LIKE GE X-RAY LASER RESONANTLY PHOTOPUMPED BY LY-ALPHA MG RADIATION SO OPTICS COMMUNICATIONS LA English DT Article ID POPULATION-INVERSION; RATE COEFFICIENTS; Z-PINCH; IONS; PLASMAS AB A new laboratory X-ray laser is proposed which lases between single electron holes involving several 2sBAR-->2pBAR transitions between 64 and 89 angstrom in neon-like germanium and which is photo-pumped by a 2p-->1s emission line in hydrogen-like magnesium. The bar over the 2s and 2p states represents a single electron hole in an otherwise closed L shell configuration. The lasing occurs with quantum efficiencies as high as 13% on these inner shell transitions. Lasing is also enhanced on several 3p-->3s transitions in Ne-like Ge which would be expected to lase from collisional excitations and recombination processes, therefore it should be much easier to observe the photo-pumping process on these longer wavelength transitions as it will increase an already finite exponential pin. Calculations of the gain of these transitions in steady-state equilibrium plasmas are presented. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP POLITOV, VY (reprint author), NATL INST TECH PHYS,RUSSIAN FED NUCL CTR,POB 245,CHELYABINSK 454070,RUSSIA. NR 30 TC 6 Z9 6 U1 0 U2 0 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 1994 VL 108 IS 4-6 BP 283 EP 288 DI 10.1016/0030-4018(94)90664-5 PG 6 WC Optics SC Optics GA NP150 UT WOS:A1994NP15000019 ER PT J AU BAKEL, AJ OSTROM, PH OSTROM, NE AF BAKEL, AJ OSTROM, PH OSTROM, NE TI CARBON ISOTOPIC ANALYSIS OF INDIVIDUAL N-ALKANES - EVALUATION OF ACCURACY AND APPLICATION TO MARINE PARTICULATE ORGANIC MATERIAL SO ORGANIC GEOCHEMISTRY LA English DT Article DE GC IRMS; CALIBRATION; PARTICULATE ORGANIC MATTER; N-ALKANES ID AMINO-ACIDS; HYDROCARBONS; NITROGEN; OIL AB The accuracy and precision of deltaC-13 analyses for individual n-alkanes determined by gas chromatography/isotope ratio mass spectrometry (GC/IRMS) were determined. A solution of n-alkanes with known deltaC-13 values (ANL-1) was prepared and analyzed by GC/IRMS, and both the precision and accuracy of these measurements were within 0.5 parts per thousand. Silica gel gravity liquid chromatography was carried out on ANL-1 in order to determine if isotopic fractionation occurred during compound class separation. Analyses of the eluates showed that little isotopic fractionation (<0.5 parts per thousand) resulted from this procedure. Two solutions (ANL-2 and EPR-1) were prepared by combining n-alkanes having known deltaC-13 values with natural petroleum backgrounds (unresolved complex mixtures). The GC/IRMS results obtained for these solutions were within 0.5 parts per thousand of the isotope ratio mass spectrometry (IRMS) results for 13 of the 21 n-alkanes measured. Six of the eight n-alkanes with deltaC-13 values that deviated by more than 0.5 parts per thousand from their IRMS results coeluted with other compounds or were present in relatively low abundance. These data indicate that for peaks of adequate size (ion beam current at m/z = 44 > 0.5 nA in this case) which do not coelute with other components, the background can be accurately subtracted using the standard software. Therefore, differences of more than 0.5 parts per thousand in the deltaC-13 values of individual n-alkanes determined by GC/IRMS appear to be significant even in the presence of background. Normal alkanes were extracted and isolated from several samples of particulate organic matter (POM) and a Recent marine sediment. Samples collected during periods of low productivity contained n-C19-n-C24 n-alkanes having higher deltaC-13 values (0.5 parts per thousand or more) than those collected when productivity was high. Normal alkanes (n-C24-n-C28) isolated from sediment samples were depleted in C-13 by more than 0.5 parts per thousand relative to POM taken during the productivity maximum. Similarly, several sediment n-alkanes (n-C24, n-C25 n-C27-n-C29 and n-C31) were depleted in C-13 by 1.0 parts per thousand or more relative to those associated with POM collected when productivity was low. Differences in the deltaC-13 of n-alkanes in these samples can be related to changes in the source and to degradation processes during residence in the water column and in sediments. C1 MICHIGAN STATE UNIV,DEPT GEOL SCI,E LANSING,MI 48824. RP BAKEL, AJ (reprint author), ARGONNE NATL LAB,DEPT GEOSCI,CMT-205,ARGONNE,IL 60439, USA. NR 16 TC 15 Z9 15 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6380 J9 ORG GEOCHEM JI Org. Geochem. PD JUN-JUL PY 1994 VL 21 IS 6-7 BP 595 EP 602 DI 10.1016/0146-6380(94)90005-1 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NU291 UT WOS:A1994NU29100005 ER PT J AU RUBLE, TE BAKEL, AJ PHILP, RP AF RUBLE, TE BAKEL, AJ PHILP, RP TI COMPOUND-SPECIFIC ISOTOPIC VARIABILITY IN UINTA BASIN NATIVE BITUMENS - PALEOENVIRONMENTAL IMPLICATIONS SO ORGANIC GEOCHEMISTRY LA English DT Article DE UINTA BASIN; BITUMEN; UTAH; GC IRMS; GILSONITE; TABBYITE; BETA-CAROTANE; CYANOBACTERIA; METHYLHOPANES; COMPOUND-SPECIFIC CARBON ISOTOPE RATIOS; WURTZILITE; GAMMACERANE; SULFATE-REDUCED BACTERIA ID STERANES; MATURATION; TERPANES AB We have analyzed the solvent extracts from three different types of native bitumens from the Uinta Basin in northeastern Utah by a variety of analytical techniques, including GC-IRMS, to evaluate variations in the paleodepositional environment during two periods of Lake Uinta deposition. The gilsonite and tabbyite bitumens are associated with Parachute Creek Member sediments deposited during a major expansion of ancient Lake Uinta. Compound specific isotopic analyses of beta-carotane and phytane (deltaC-13 = -32.6 to -32.1 parts per thousand) from these bitumens reflect input from primary photosynthetic producers such as cyanobacteria. Sterane deltaC-13 values (-34.5 to -29.2 parts per thousand) reflect contributions from lacustrine algae, while extremely depleted deltaC-13 values for methylhopanes (-58.1 to -61.5 parts per thousand) suggest input from methanotrophic bacteria. Variations in the deltaC-13 values of the alphabeta-hopanes (-51.4 to 37.7 parts per thousand) imply additional input from other bacterial sources. The wurtzilite bitumen was generated from the Saline Facies of the Green River Formation deposited during a later regression of Lake Uinta. Compound specific isotopic analyses of phytane (deltaC-13 = -30.1 parts per thousand) and steranes (deltaC-13 = -29.6 to -26.7 parts per thousand) from this bitumen indicate continued input from primary producers and eukaryotes. The higher relative concentrations of gammacerane (deltaC-13 = -26.9 parts per thousand) indicate increasing input from aerobic protozoa. We observed a slight enrichment in deltaC-13 in the wurtzilite extract (and several biomarkers) and suggest that this is a result of sulfate-reducing bacteria outcompeting methanogens, thereby, eliminating the influence of methanotrophs in this later saline stage of deposition. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP RUBLE, TE (reprint author), UNIV OKLAHOMA,SCH GEOL & GEOPHYS,NORMAN,OK 73019, USA. NR 54 TC 29 Z9 35 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6380 J9 ORG GEOCHEM JI Org. Geochem. PD JUN-JUL PY 1994 VL 21 IS 6-7 BP 661 EP 671 DI 10.1016/0146-6380(94)90011-6 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NU291 UT WOS:A1994NU29100011 ER PT J AU DISTEFANO, JR HENDRICKS, JW AF DISTEFANO, JR HENDRICKS, JW TI OXIDATION RATES OF NIOBIUM AND TANTALUM ALLOYS AT LOW-PRESSURES SO OXIDATION OF METALS LA English DT Article DE OXIDATION RATE; LOW PRESSURE; NB-1ZR; PWC-11; ASTAR-811C AB Niobium and tantalum alloys have excellent properties for use in high-temperature, space-power applications, but must be protected from oxidation that would result from exposure to air in ground-evaluation tests. The oxygen-uptake/oxidation rates of three alloys, Nb-1Zr, PWC-11, and ASTAR-811C were measured at oxygen partial pressure of 10(-6) and 10(-7) torr at temperatures up to 1350 K. No visible oxide film was observed, and the oxidation rate was found to be linearly proportional to pressure and exponentially proportional to temperature. A thin molybdenum coating on Nb-1Zr was a barrier to low-pressure oxidation at 773 K RP DISTEFANO, JR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 TC 7 Z9 7 U1 1 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0030-770X J9 OXID MET JI Oxid. Met. PD JUN PY 1994 VL 41 IS 5-6 BP 365 EP 376 DI 10.1007/BF01113371 PG 12 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA NX046 UT WOS:A1994NX04600004 ER PT J AU HENKEN, AM PLOEGER, HW GRAAT, EAM CARPENTER, TE AF HENKEN, AM PLOEGER, HW GRAAT, EAM CARPENTER, TE TI DESCRIPTION OF A SIMULATION-MODEL FOR THE POPULATION-DYNAMICS OF EIMERIA-ACERVULINA INFECTION IN BROILERS SO PARASITOLOGY LA English DT Article DE SIMULATION; EIMERIA ACERVULINA; COCCIDIOSIS; ANTICOCCIDIAL DRUG EFFICACY; HOST IMMUNITY; BROILERS ID OOCYSTS; LITTER; COCCIDIA; POULTRY AB A simulation model for the population dynamics of Eimeria acervulina infection in broilers is presented. The model describes the development of the numbers of parasites in the various life-stages during the growing period of broilers and the empty house period between grow-outs. The model includes assumptions with respect to development of immunity to E. acervulina infection and effects of application of anticoccidial drugs. The model consists of a set of difference equations that are solved numerically at 1 h intervals. Under constant conditions, an equilibrium level was reached after a few grow-outs during which infection always peaked around the 21st day in the growing period. Within a growing period, infection peaked earlier (later) than the 21st day in case initial numbers of sporulated oocysts were higher (lower) than the equilibrium number. C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT EPIDEMIOL & PREVENT MED,DAVIS,CA 95616. RP HENKEN, AM (reprint author), AGR UNIV WAGENINGEN,DEPT ANIM HUSB,POB 338,6700 AH WAGENINGEN,NETHERLANDS. NR 30 TC 15 Z9 15 U1 0 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0031-1820 J9 PARASITOLOGY JI Parasitology PD JUN PY 1994 VL 108 BP 503 EP 512 PN 5 PG 10 WC Parasitology SC Parasitology GA NR045 UT WOS:A1994NR04500003 PM 8052505 ER PT J AU HENKEN, AM GRAAT, EAM PLOEGER, HW CARPENTER, TE AF HENKEN, AM GRAAT, EAM PLOEGER, HW CARPENTER, TE TI DESCRIPTION OF A MODEL TO SIMULATE EFFECTS OF EIMERIA-ACERVULINA INFECTION ON BROILER PRODUCTION SO PARASITOLOGY LA English DT Article DE SIMULATION; EIMERIA ACERVULINA; COCCIDIOSIS; PRODUCTION CHARACTERISTICS; NET REVENUE; BROILERS AB A simulation model for effects of Eimeria acervulina infection on technical and economic characteristics in broiler production is presented. The model describes development over time of the growth depression, feed intake reduction, and decrease in feed efficiency associated with infection. The model also shows a phase of compensatory growth during which earlier negative effects are counterbalanced, at least partly. Major assumptions made were: infection with E. acervulina occurs in each flock; production is affected in each flock; compensatory growth takes place because immunity develops and cell regeneration occurs. The results show that the pattern of development of the production characteristics during a flock cycle depends on the initial contamination level. Both a high and low initial contamination level results in a lower average daily gain, a worse feed to gain ratio, and a reduced net revenue compared to an intermediate contamination level. C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT EPIDEMIOL & PREVENT MED,DAVIS,CA 95616. RP HENKEN, AM (reprint author), AGR UNIV WAGENINGEN,DEPT ANIM HUSB,POB 338,6700 AH WAGENINGEN,NETHERLANDS. NR 20 TC 11 Z9 11 U1 0 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0031-1820 J9 PARASITOLOGY JI Parasitology PD JUN PY 1994 VL 108 BP 513 EP 518 PN 5 PG 6 WC Parasitology SC Parasitology GA NR045 UT WOS:A1994NR04500004 PM 8052506 ER PT J AU TIWARI, P WU, XD FOLTYN, SR LEE, MQ CAMPBELL, IH DYE, RC MUENCHAUSEN, RE SMITH, JF MITCHELL, TE AF TIWARI, P WU, XD FOLTYN, SR LEE, MQ CAMPBELL, IH DYE, RC MUENCHAUSEN, RE SMITH, JF MITCHELL, TE TI STUDY OF LOW-RESISTIVITY OXIDES ON PT MGO SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID PHYSICAL VAPOR-DEPOSITION; BA-CU-O; THIN-FILMS; YBA2CU3O7-DELTA; SRTIO3 AB Highly crystalline SrRuO3 (SRO) and La0.5Sr0.5CoO3 (LSCO) thin films were deposited on Pt/MgO(100) by pulsed laser deposition. The films were mainly (001) textured normal to the substrate surface with a high degree of in-plane orientation with respect to the substrate's major axes. These films were characterized using X-ray diffraction, Rutherford backscattering, four-point probe resistivity measurement and transmission electron microscopy. The room-temperature resistivities for LSCO and SRO films on Pt/MgO were found to be 35 and 40 muOMEGA cm respectively. lon beam minimum channelling yields of 43 and 33% were obtained for LSCO and SRO films respectively. The interface between Pt and oxide was found to be smooth and free from any interfacial diffusion. This result showed that high-quality low-resistivity oxide thin films can be deposited on Pt. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP TIWARI, P (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JUN PY 1994 VL 69 IS 6 BP 1101 EP 1110 DI 10.1080/01418639408240180 PG 10 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA NR847 UT WOS:A1994NR84700004 ER PT J AU BOUKHNY, M BULLOCK, GL SHIVARAM, BS HINKS, DG AF BOUKHNY, M BULLOCK, GL SHIVARAM, BS HINKS, DG TI UNIAXIAL PRESSURE-DEPENDENCE OF THE CRITICAL-FIELD ANISOTROPY IN UPT3 SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID HEAVY-FERMION SUPERCONDUCTOR; PHASE-DIAGRAM; ODD-PARITY; TRANSITION AB UPt3 is known to possess a unique phase diagram. Close to T(c), three superconducting phases A, B and C coexist with the normal phase N giving rise to a tetracritical point. Furthermore, the anisotropy in the upper critical field H(c2) near T(c) is reversed at low temperatures. In this letter we show that the behaviour under uniaxial pressure is unusual as well. For pressure, P(c) parallel to the c axis, H(c2) is enhanced at low temperatures for H parallel to the a axis but is depressed for H parallel to c. In contrast the B-C transition is always depressed with increasing P(c) for both the field orientations. Order-parameter candidates selected to explain the tetracritical point in the phase diagram of UPt3 near T(c) must also yield results consistent with the behaviour of the phase lines observed by us at low temperatures. C1 ARGONNE NATL LABS,DIV MAT SCI,ARGONNE,IL 60639. RP BOUKHNY, M (reprint author), UNIV VIRGINIA,JESSE W BEAMS LAB PHYS,CHARLOTTESVILLE,VA 22901, USA. NR 25 TC 5 Z9 5 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD JUN PY 1994 VL 69 IS 6 BP 319 EP 326 DI 10.1080/09500839408242440 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA NR845 UT WOS:A1994NR84500004 ER PT J AU CAMPBELL, EM AF CAMPBELL, EM TI THE ROLE OF DOE LABS SO PHOTONICS SPECTRA LA English DT Letter RP CAMPBELL, EM (reprint author), LAWRENCE LIVERMORE NATL LAB,LASER & ENVIRONM PROGRAMS,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD JUN PY 1994 VL 28 IS 6 BP 12 EP 12 PG 1 WC Optics SC Optics GA NQ888 UT WOS:A1994NQ88800004 ER PT J AU ISRAEL, AA NOBEL, PS AF ISRAEL, AA NOBEL, PS TI ACTIVITIES OF CARBOXYLATING ENZYMES IN THE CAM SPECIES OPUNTIA-FICUS-INDICA GROWN UNDER CURRENT AND ELEVATED CO2 CONCENTRATIONS SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE CRASSULACEAN ACID METABOLISM; CO2 ENRICHMENT; OPUNTIA FICUS-INDICA; PEPCASE; RUBISCO ID CRASSULACEAN ACID METABOLISM; CARBON-DIOXIDE; AGAVE-VILMORINIANA; ATMOSPHERIC CO2; SHORT-TERM; PHOTOSYNTHESIS; PLANTS; RESPONSES; PRODUCTIVITY; ACCLIMATION AB Responses of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPCase) to an elevated atmospheric CO2 concentration were determined along with net CO2 uptake rates for the Crassulacean acid metabolism species Opuntia ficus-indica growing in open-top chambers. During the spring 13 months after planting, total daily net CO2 uptake of basal and first-order daughter cladodes was 28% higher at 720 than at 360 mu l CO2 1(-1). The enhancement, caused mainly by higher CO2 assimilation during the early part of the night, was also observed during late summer (5 months after planting) and the following winter. The activities of Rubisco and PEPCase measured in vitro were both lower at the elevated CO2 concentration, particularly under the more favorable growth conditions in the spring and late summer. Enzyme activity in second-order daughter cladodes increased with cladode age, becoming maximal at 6 to 10 days. The effect of elevated CO2 on Rubisco and PEPCase activity declined with decreasing irradiance, especially for Rubisco. Throughout the 13-month observation period, O. ficus-indica thus showed increased CO2 uptake when the atmospheric CO2 concentration was doubled despite lower activities of both carboxylating enzymes. C1 UNIV CALIF LOS ANGELES,UCLA DOE LAB,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024. NR 33 TC 15 Z9 15 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD JUN PY 1994 VL 40 IS 3 BP 223 EP 229 DI 10.1007/BF00034772 PG 7 WC Plant Sciences SC Plant Sciences GA PD908 UT WOS:A1994PD90800002 PM 24309941 ER PT J AU FUCHS, R GHOSH, K AF FUCHS, R GHOSH, K TI OPTICAL AND DIELECTRIC-PROPERTIES OF SELF-SIMILAR STRUCTURES SO PHYSICA A LA English DT Article; Proceedings Paper CT 3rd International Conference on Electrical Transport and Optical Properties of Inhomogeneous Media (ETOPIM 3) CY AUG 09-13, 1993 CL GUANAJUATO, MEXICO ID HETEROGENEOUS SYSTEMS; SEDIMENTARY-ROCKS; CRITICAL-BEHAVIOR; POLARIZATION; CONSTANT; MODEL AB The effective dielectric constant and spectral function of a composite system prepared by recursively introducing inclusions of a given component are calculated. Connections are made with differential effective medium theory, and dynamical critical behavior is studied. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. JACKSON STATE UNIV,DEPT PHYS & ATMOSPHER SCI,JACKSON,MS 39217. RP FUCHS, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD JUN 1 PY 1994 VL 207 IS 1-3 BP 185 EP 196 DI 10.1016/0378-4371(94)90372-7 PG 12 WC Physics, Multidisciplinary SC Physics GA NR992 UT WOS:A1994NR99200026 ER PT J AU SPECHT, ED GOYAL, A KROEGER, DM DELUCA, JA TKACZYK, JE BRIANT, CL SUTLIFF, JA AF SPECHT, ED GOYAL, A KROEGER, DM DELUCA, JA TKACZYK, JE BRIANT, CL SUTLIFF, JA TI X-RAY MICRODIFFRACTION ANALYSIS OF MM-SCALE ORIENTATIONAL CORRELATIONS IN TL-1223 HIGH-CRITICAL-CURRENT, HIGH-TEMPERATURE SUPERCONDUCTING FILMS SO PHYSICA C LA English DT Article ID CRITICAL CURRENT-DENSITY; BA-CU-OXIDE; TAPES; DEPENDENCE; VAPOR; MODEL AB Tl1-yBa2Ca2Cu3Ox, y < 0.2, (Tl-1223) films grown on polycrystalline yttria-stabilized zirconia (YSZ) substrates exhibit a microstructure common in high-critical-current, high-temperature superconducting films. Plate-like grains are aligned with c-axes normal to the film; a- and b-axes are randomly oriented on a macroscopic scale. We describe X-ray pole-figure measurements from 0.1 mm regions of Tl-1223 films. For samples with the highest critical currents, the a-axes of the grains are locally aligned over distances up to 1 mm. Regions of higher critical current are associated with regions of high a-axis alignment. C1 GE CO,RES & DEV,SCHENECTADY,NY 12301. 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 20 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1994 VL 226 IS 1-2 BP 76 EP 84 DI 10.1016/0921-4534(94)90480-4 PG 9 WC Physics, Applied SC Physics GA NR010 UT WOS:A1994NR01000011 ER PT J AU MOROSIN, B VENTURINI, EL SCHIRBER, JE NEWCOMER, PP AF MOROSIN, B VENTURINI, EL SCHIRBER, JE NEWCOMER, PP TI ANNEALING STUDIES ON HG-CONTAINING MATERIALS SO PHYSICA C LA English DT Article ID NEUTRON POWDER DIFFRACTION; SUPERCONDUCTIVITY; HGBA2CACU2O6+DELTA; HGBA2CUO4+DELTA; HGBA2CA2CU3O8+DELTA; TEMPERATURE; RESISTIVITY AB The superconductors, HgBa2CanCun+1O4+2n+delta, with n = 1,2 and 3 were prepared and annealed under a variety of conditions including high-pressure oxygen. Superconducting transition temperatures T(c) are determined as a function of oxygen annealing pressure. These results show that the n = 1 and 2 materials will overdope when annealed at pressures in excess of 1 bar while n = 3 requires tens of bars. RP MOROSIN, B (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 30 TC 34 Z9 34 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1994 VL 226 IS 1-2 BP 175 EP 183 DI 10.1016/0921-4534(94)90494-4 PG 9 WC Physics, Applied SC Physics GA NR010 UT WOS:A1994NR01000025 ER PT J AU HOWIE, DJH HALLETT, WA MYERS, EG DIETRICH, DD SILVER, JD AF HOWIE, DJH HALLETT, WA MYERS, EG DIETRICH, DD SILVER, JD TI MEASUREMENT OF 1S2S S-3(1)-1S2P P-3(2,0) WAVELENGTHS IN HELIUM-LIKE SILICON SO PHYSICAL REVIEW A LA English DT Article ID DIRAC-FOCK CALCULATIONS; RYDBERG STATES; 2-ELECTRON IONS; MICROWAVE SPECTROSCOPY; ISOELECTRONIC SEQUENCE; TRANSITION ENERGIES; TESTS AB We have measured the vacuum-ultraviolet 1s2s S-3(1)-1s2p P-3(2,0) transition wavelengths in heliumlike silicon by photographic spectroscopy of a beam-foil source. The results are 814.71 +/- 0.02 angstrom and 978.68 +/- 0.03 angstrom, respectively, and represent a sensitive test of present relativistic and quantum electrodynamic calculations. Comparisons are made between our results, previous measurements of these transitions, and the current theories. Good agreement is obtained, particularly with recent relativistic many-body perturbation calculations. A discussion of future measurements of this interval is also presented. C1 LAWRENCE LIVERMORE NATL LAB,HIGH TEMP PHYS,LIVERMORE,CA 94550. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. RP HOWIE, DJH (reprint author), UNIV OXFORD,CLARENDON LAB,OXFORD OX1 3PU,ENGLAND. NR 46 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP 4390 EP 4397 DI 10.1103/PhysRevA.49.4390 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800019 ER PT J AU LEON, M AF LEON, M TI 3-BODY MOLECULAR FORMATION IN MUON-CATALYZED D-T FUSION - THE CLASSICAL-TRAJECTORY MODEL SO PHYSICAL REVIEW A LA English DT Article ID COLLISIONS AB The three-body contribution to resonant dtmu formation, coming from the configuration mixing of the angular momentum states of the [(dtmu)d2e]* complex caused by colliding D2 molecules, is calculated in a classical-trajectory model. The collisions bring about significant broadening of the transition energies and an important contribution to three-body molecular formation. Results are presented in terms of a universal ''width function'' lambda(ff') for states f and f', and indicate that neither the impact approximation nor a recent quasistatic calculation of this process can be considered reliable. Furthermore, the calculated three-body molecular formation rate has the experimentally correct magnitude and temperature dependence. RP LEON, M (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 18 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP 4438 EP 4442 DI 10.1103/PhysRevA.49.4438 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800025 ER PT J AU HU, CY HALE, GM COHEN, JS AF HU, CY HALE, GM COHEN, JS TI VARIATIONAL CALCULATIONS FOR THE DT-MU MOLECULE INCLUDING NUCLEAR EFFECTS ON STICKING BY MEANS OF THE BLOCH OPERATOR SO PHYSICAL REVIEW A LA English DT Article ID D-T FUSION; CATALYZED FUSION; MUONIC HELIUM; S-STATES; RESONANCES; FRACTIONS AB We investigate the effects of nuclear forces on the eigenvalues and sticking fractions of the ground and excited J = 0 states of the dtmu molecule using a variational R-matrix approach. The nuclear boundary condition is imposed on the entire variational wave function, rather than on the individual elements of the basis, by means of the Bloch operator. This formulation results in rigorously symmetric variational matrix elements and improved flexibility of the basis at small d-t separations. Oui- results for the fusion rates and initial sticking fractions are lambda(f) = 1.25 x 10(12) sec-1 and omega(s)0 = 0.912% for the v = 0 state and LAMBDA(f) = 1.05 x 10(12) sec-1 and omega(s) = 0.912% for the v = 1 state. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP HU, CY (reprint author), CALIF STATE UNIV LONG BEACH,DEPT PHYS,LONG BEACH,CA 90840, USA. NR 29 TC 20 Z9 21 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 PY 1994 VL 49 IS 6 BP 4481 EP 4488 DI 10.1103/PhysRevA.49.4481 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800031 ER PT J AU REICH, T HEIMANN, PA PETERSEN, BL HUDSON, E HUSSAIN, Z SHIRLEY, DA AF REICH, T HEIMANN, PA PETERSEN, BL HUDSON, E HUSSAIN, Z SHIRLEY, DA TI NEAR-THRESHOLD BEHAVIOR OF THE K-SHELL SATELLITES IN CO SO PHYSICAL REVIEW A LA English DT Article ID PHOTOELECTRON-SPECTRUM; HIGH-RESOLUTION; SYNCHROTRON RADIATION; PHOTOIONIZATION; NEON; 1S; GASES; N2; INTENSITIES; IONIZATION AB The study of photoelectron satellites in the near-threshold region is important for differentiating among various electron correlation mechanisms. For CO, which is a prominent test case for theories describing electron correlation effects, the threshold and near-threshold branching ratios (BR's) of the K-shell satellites were measured. Eight different C ls satellite states were identified, showing very complex threshold behavior. The resonancelike behavior of the (2sigma)-1(1pi)-1(2pi*)1(S'=1) satellite BR agrees with recent theoretical calculations. The observed energy dependence of the singlet (2sigma)-1(1pi)-1(2pi*)1 satellite compares less well with the calculations. Three 2SIGMA+ satellites with a (2sigma)-1(5sigma)-1(nsigma)1 configuration have a constant satellite BR over the energy range studied. Three 2sigma satellites, which have been assigned as pure conjugate shake-up states, have intensity-only near threshold. The threshold spectrum above the O 1s ionization threshold consists of two distinct groups of satellites. Conjugate shake-up transitions contribute to the intense feature centered at 551-eV binding energy, which is not observed above its threshold. Two 2SIGMA+ satellites, which have been described by configuration interaction of (1sigma)-1(5sigma)-1(na)1 states with a singlet pipi* state, show indications of shape-resonance-like behavior. C1 LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUSION RES,BERKELEY,CA 94720. PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. RP REICH, T (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Reich, Tobias/C-7064-2016 OI Reich, Tobias/0000-0002-5600-3951 NR 34 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP 4570 EP 4577 DI 10.1103/PhysRevA.49.4570 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800041 ER PT J AU BELL, EW GUO, XQ FORAND, JL RINN, K SWENSON, DR THOMPSON, JS DUNN, GH BANNISTER, ME GREGORY, DC PHANEUF, RA SMITH, ACH MULLER, A TIMMER, CA WAHLIN, EK DEPAOLA, BD BELIC, DS AF BELL, EW GUO, XQ FORAND, JL RINN, K SWENSON, DR THOMPSON, JS DUNN, GH BANNISTER, ME GREGORY, DC PHANEUF, RA SMITH, ACH MULLER, A TIMMER, CA WAHLIN, EK DEPAOLA, BD BELIC, DS TI MERGED-BEAMS ENERGY-LOSS TECHNIQUE FOR ELECTRON-ION EXCITATION - ABSOLUTE TOTAL CROSS-SECTIONS FOR O5+(2S-]2P) SO PHYSICAL REVIEW A LA English DT Article ID IMPACT EXCITATION; 2S-2P EXCITATION; MONOCHROMATOR; SYSTEMS AB A merged-beams electron-energy-loss technique is described, by which absolute cross sections can be measured for near-threshold electron-impact excitation of multipy charged ions. Results are reported here for absolute total electron-impact excitation cross sections for the O5+(2s --> 2p) transition from below threshold to 1.6 eV above threshold. The experimental data are in good agremeent with a seven-state close-coupling calculation throughout the energy range of the experiment. Results agree with calculations showing that more than 90% of the electrons causing excitation are ejected in the backward direction in the center-of-mass frame. This backscattering is shown in both quantum-mechanical and semiclassical calculations. Evidence is observed for high-lying metastable autoionizing states with a lifetime of approximately 0.9 mus which are made to ionize by electron impact. C1 NATL INST STAND & TECHNOL,BOULDER,CO 80309. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND. UNIV STUTTGART,INST STRAHLENPHYS,D-70569 STUTTGART,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. KANSAS STATE UNIV AGR & APPL SCI,MANHATTAN,KS 66506. UNIV BELGRADE,BELGRADE,YUGOSLAVIA. RP BELL, EW (reprint author), UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309, USA. RI Muller, Alfred/A-3548-2009; DePaola, Brett/I-3533-2013; OI Muller, Alfred/0000-0002-0030-6929; DePaola, Brett/0000-0003-3409-671X; Thompson, Jeffrey/0000-0001-9699-5767 NR 45 TC 49 Z9 49 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP 4585 EP 4596 DI 10.1103/PhysRevA.49.4585 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800043 ER PT J AU BANNISTER, ME GUO, XQ KOJIMA, TM AF BANNISTER, ME GUO, XQ KOJIMA, TM TI ABSOLUTE CROSS-SECTIONS FOR ELECTRON-IMPACT SINGLE IONIZATION OF KR4+, KR5+, AND KR7+ IONS SO PHYSICAL REVIEW A LA English DT Article ID CHARGED KRYPTON IONS; RARE-GAS IONS AB Absolute total cross sections for electron-impact single ionization of Kr4+, Kr5+, and Kr7+ ions have been measured using a crossed-beams technique from below threshold to 500, 400, and 500 eV, respectively, with absolute uncertainties of 12% or less. The measured cross sections are in good agreement with distorted-wave calculations and show significant contributions from excitation autoionization. Nonzero cross sections below threshold for the Kr4+ and Kr5+ ions suggest the presence of metastable ions in those two species that were extracted from an electron-cyclotron-resonance ion source. Such evidence of metastable ions was not found in the case of the Kr7+ ion measurment. C1 UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. NATL INST STAND & TECHNOL,BOULDER,CO 80309. RP BANNISTER, ME (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. OI Bannister, Mark E./0000-0002-9572-8154 NR 20 TC 18 Z9 18 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 JUN PY 1994 VL 49 IS 6 BP 4676 EP 4681 DI 10.1103/PhysRevA.49.4676 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800054 ER PT J AU KURZ, H AUMAYR, F WINTER, HP SCHNEIDER, D BRIERE, MA MCDONALD, JW AF KURZ, H AUMAYR, F WINTER, HP SCHNEIDER, D BRIERE, MA MCDONALD, JW TI ELECTRON-EMISSION AND IMAGE-CHARGE ACCELERATION FOR THE IMPACT OF VERY HIGHLY-CHARGED IONS SO PHYSICAL REVIEW A LA English DT Article ID CLEAN METAL-SURFACE; SLOW MULTICHARGED IONS; X-RAY-EMISSION; GOLD SURFACE; AR IONS; TUNGSTEN SURFACE; ABOVE-SURFACE; HOLLOW ATOMS; NEUTRALIZATION; AUGER AB We present total yields for emission of slow (E(e) less-than-or-equal-to 50 eV) electrons due to the impact of slow (v(p) less-than-or-equal-to 5 X 10(5) m/s) highly charged ions [Ar(q+) (q less-than-or-equal-to 18), Xe(q+) (q less-than-or-equal-to 51), and Th(q+) (q less-than-or-equal-to 80)] on clean polycrystalline gold. The highly charged ions were produced in the Lawrence Livermore National Laboratory electron-beam ion trap; electron yields have been derived from the respective measured electron emission statistics. The experimental data support a currently accepted scenario for multicharged ion-induced electron emission, which is largely based on a classical over-barrier model. In particular, we are able to distinguish different processes contributing to the total above-surface electron emission. In addition, an ultimate low-impact-energy limit due to projectile self-acceleration toward the metal surface, as a result of the projectile image charge, has been demonstrated and evaluated. C1 VIENNA TECH UNIV,INST ALLGEMEINE PHYS,A-1040 VIENNA,AUSTRIA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RI Aumayr, Friedrich/A-3920-2009 OI Aumayr, Friedrich/0000-0002-9788-0934 NR 54 TC 61 Z9 62 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 JUN PY 1994 VL 49 IS 6 BP 4693 EP 4702 DI 10.1103/PhysRevA.49.4693 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800056 ER PT J AU BERMAN, GP BULGAKOV, EN HOLM, DD AF BERMAN, GP BULGAKOV, EN HOLM, DD TI QUANTUM CHAOS OF ATMOS IN A RESONATOR DRIVEN BY AN EXTERNAL RESONANT FIELD SO PHYSICAL REVIEW A LA English DT Article ID PHASE-SPACE METHODS; NONCOMMUTING OPERATORS; COHERENT STATES; SUPER-RADIANCE; MECHANICS; CALCULUS; DYNAMICS; SYSTEMS; ATOMS AB A system of N two-level atoms in a resonator is considered interacting with a resonant eigenmode field and with an external coherent field, with a frequency slightly different from the frequency of the atomic transition. A model Hamiltonian is constructed for describing the slow quantum dynamics of the system, and a set of closed c-number equations for time-dependent quantum expectation values is derived in the boson and spin coherent states. In the region of parameters for developed chaos in the semiclassical limit (when the radiation field is considered classically) we show that the semiclassical approximation is violated by quantum effects at the time scale tau(hBAR) approximately lnN. We also show that quantum correlations grow exponentially during the time interval 0 < tau < tau(hBAR). An additional averaging over the initial density matrix is considered. The connection of our model with the Dicke model [Phys. Rev. 93, 99 (1956)] is demonstrated, and the possiblity of measuring the quantum chaos effects considered in this paper is discussed. C1 KRASNOYARSK STATE UNIV,KRASNOYARSK POLYTECH INST,KIRENSKY INST PHYS,KRASNOYARSK 660036,RUSSIA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. KRASNOYARSK STATE UNIV,DEPT THEORET,KRASNOYARSK 660036,RUSSIA. RP BERMAN, GP (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 33 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP 4943 EP 4956 DI 10.1103/PhysRevA.49.4943 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800082 ER PT J AU STOLTERFOHT, N SCHNEIDER, D BURCH, D WIEMAN, H RISLEY, JS AF STOLTERFOHT, N SCHNEIDER, D BURCH, D WIEMAN, H RISLEY, JS TI CHARGE-STATE DEPENDENCE OF ELECTRON-EMISSION IN 30-MEV O(Q+) PLUS O2 COLLISIONS SO PHYSICAL REVIEW A LA English DT Note ID ION ATOM COLLISIONS; ENCOUNTER; 0-DEGREES; TARGETS; HE AB In view of controversial discussions in the literature concerning the charge-state dependence of the binary encounter maximum, we reexamined our early experiments of cross sections for electron emission at 25-degrees in 30-MeV O(q+) + O2 collisions. Analyzing KLL target Auger peaks in the electron spectra, we revised our previous data for the projectile charge state q = 8 whereas the data for q = 4-7 are essentially confirmed. Hence, the binary encounter maximum is found to increase with an increasing charge state of q = 4-7 and it decreases from q = 7-8. C1 UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. STARPATH SCH NAVIGAT,SEATTLE,WA 98109. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP STOLTERFOHT, N (reprint author), HAHN MEITNER INST BERLIN GMBH,GLIENICKERSTR 100,D-14109 BERLIN,GERMANY. NR 17 TC 8 Z9 8 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP 5112 EP 5115 DI 10.1103/PhysRevA.49.5112 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800105 ER PT J AU KIMURA, M SHIMAMURA, I INOKUTI, M AF KIMURA, M SHIMAMURA, I INOKUTI, M TI SINGLE AND DOUBLE-IONIZATION OF HE BY SLOW PROTONS AND ANTIPROTONS SO PHYSICAL REVIEW A LA English DT Note ID ELECTRON-CAPTURE; LOW-ENERGY; COLLISIONS; HELIUM; IONS; IMPACT; H+; DEPENDENCE; EXCITATION; PARTICLE AB Double and single ionization of He by proton (p) and antiproton (pBAR) impact in the energy region below 50 keV is studied theoretically within a molecular picture. As the energy decreases, the ratio of the double- to single-ionization cross section is found to increase for pBAR and to decrease for p impact in agreement with recent measurements. For p impact, the dominant mechanism for double ionization at the lower energies seems to be sequential ladder climbing by the two electrons through various excited channels. For pBAR impact, in contrast, the approaching negative charge distorts the He electron cloud toward the other side of the nucleus and decreases the electron binding energies. These effects enhance the important role of electron-electron interactions, increasing double ionization. C1 RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RIKEN,INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN. RP KIMURA, M (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 26 TC 13 Z9 13 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP R4281 EP R4284 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800004 ER PT J AU MACEK, JH OVCHINNIKOV, SY AF MACEK, JH OVCHINNIKOV, SY TI HARMONIC-OSCILLATOR STRUCTURE OF CLASSICALLY UNSTABLE MOTION SO PHYSICAL REVIEW A LA English DT Note ID ELECTRON-ATOM IONIZATION; THRESHOLD LAW AB A quantal description of classcially unstable motion which employs the integration of the Schrodinger equation along a path in the complex-coordinate plane is described. It is shown that a region in the complex-coordinate plane exists where the Schrodinger wave function is well described in a harmonic-oscillator approximation. The breakup of the hydrogen molecule ion H-2+ is used as a prototype to illustrate the method. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. IOFFE PHYS TECH INST,ST PETERSBURG,RUSSIA. RP MACEK, JH (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Ovchinnikov, Serguei/C-4994-2014 NR 13 TC 16 Z9 16 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN PY 1994 VL 49 IS 6 BP R4273 EP R4276 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800002 ER PT J AU SCHEIDEMANN, AA KRESIN, VV KNIGHT, WD AF SCHEIDEMANN, AA KRESIN, VV KNIGHT, WD TI VAN-DER-WAALS FORCES BETWEEN METAL MICROCLUSTERS AND FULLERENES SO PHYSICAL REVIEW A LA English DT Note ID RESPONSE PROPERTIES; CLUSTERS; C-60; POLARIZABILITIES; GAS; BUCKMINSTERFULLERENE; FRAGMENTATION; RESONANCES; MOLECULES AB Absolute integral cross sections for low-energy scattering of neutral sodium clusters Na(n) (2 < n < 20) by C60 fullerenes have been measured. Cluster-cluster interaction is dominated by long-range van der Waals forces. Interaction constants determined from the data are in good agreement with the prediction of dispersion theory based on the spectral properties. The large cluster polarizabilities are responsible for the high strength of the interaction potential and, consequently, for the large center-of-mass cross sections (greater-than-or-similar-to 5000 angstrom2 for Na20-C60 collisions). C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SCHEIDEMANN, AA (reprint author), UNIV WASHINGTON,DEPT CHEM,SEATTLE,WA 98195, USA. RI Kresin, Vitaly/N-8095-2014 OI Kresin, Vitaly/0000-0002-6226-4576 NR 30 TC 26 Z9 26 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 JUN PY 1994 VL 49 IS 6 BP R4293 EP R4296 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NT908 UT WOS:A1994NT90800007 ER PT J AU KWAK, BS ERBIL, A BUDAI, JD CHISHOLM, MF BOATNER, LA WILKENS, BJ AF KWAK, BS ERBIL, A BUDAI, JD CHISHOLM, MF BOATNER, LA WILKENS, BJ TI DOMAIN FORMATION AND STRAIN RELAXATION IN EPITAXIAL FERROELECTRIC HETEROSTRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID PBTIO3 THIN-FILMS; SUPERCONDUCTIVITY; SYSTEM AB The growth of PbTiO3 films by a metalorganic chemical-vapor-deposition technique has resulted in three-dimensionally epitaxial heterostructures on various single-crystal substrates. These heterostructures consist of PbTiO3 films on the (001) surface of the single crystals: potassium tantalate (KTaO3), strontium titanate (SrTiO3), and magnesium oxide (MgO). It was found that the presence of a structural (ferroelectric) phase transition in PbTiO3 leads to a ''strain-accommodating'' mechanism in which a domain pattern forms as the system cools through the Curie temperature and limits the extension of interfacial strain in the heterostructure-thus minimizing the total energy of the heterostructure. For PbTiO3/KTaO3(001), the interfacial strain is accommodated by the formation of a periodic domain pattern in the overlayer. In PbTiO3/SrTiO3(001), which exhibits an excellent lattice match between respective a lattice parameters, the film exists as a single c domain. The PbTiO3/MgO(001) system, having a poor lattice match for both the a and c axes, appears to find the energy minimum by locking into domains of two-dimensional superlattices with the greatest atomic coincidences. It is found that the nature of the domain pattern depends very strongly on both the film thickness and measuring temperature. A theoretical model of the domain-pattern formation has been developed by using linear-elasticity theory and a Landau-Ginzburg-Devonshire-type phenomenological theory for the substrate and the overlayer, respectively. The theoretical predictions and the experimental measurements were in good agreement in both the thickness and temperature dependence of the relative domain population and the spontaneous strains. C1 BELL COMMUN RES INC,RED BANK,NJ 07701. GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. 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 40 TC 208 Z9 208 U1 5 U2 66 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 1994 VL 49 IS 21 BP 14865 EP 14879 DI 10.1103/PhysRevB.49.14865 PG 15 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500007 ER PT J AU FOILES, SM AF FOILES, SM TI EVALUATION OF HARMONIC METHODS FOR CALCULATING THE FREE-ENERGY OF DEFECTS IN SOLIDS SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; MOLECULAR-DYNAMICS; THERMAL-EXPANSION; METALS; MINIMIZATION; FCC; THERMODYNAMICS; BOUNDARIES; SIMULATION; CRYSTALS AB The free energy of defects in solids is computed with Monte Carlo simulation techniques and by various approximate techniques. The results are compared in order to determine the accuracy and range of applicability of the various approximate methods. The systems studied are a bulk crystal, a vacancy, a (100) free surface, and a SIGMA5(310)/[001] symmetric tilt boundary in Cu described by embedded-atom method potentials. The Monte Carlo simulations employ both the Frenkel-Ladd method and thermodynamic integration. The approximate techniques include quasiharmonic calculations and the recently proposed local harmonic method. The results indicate that the harmonic methods significantly underestimate the temperature variation of the defect-free energies for this potential. The discrepancies become large for temperatures above about half of the melting point. RP FOILES, SM (reprint author), SANDIA NATL LABS, LIVERMORE, CA 94551 USA. OI Foiles, Stephen/0000-0002-1907-454X NR 36 TC 121 Z9 121 U1 3 U2 21 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 JUN 1 PY 1994 VL 49 IS 21 BP 14930 EP 14938 DI 10.1103/PhysRevB.49.14930 PG 9 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500013 ER PT J AU REYNOLDS, GAM WANG, ZH DRESSELHAUS, MS FUNG, AWP PEKALA, RW AF REYNOLDS, GAM WANG, ZH DRESSELHAUS, MS FUNG, AWP PEKALA, RW TI PHOTOCONDUCTIVITY - A PROBE OF DEFECT STATES IN CARBON AEROGELS SO PHYSICAL REVIEW B LA English DT Article ID FIBERS AB The photoconductivity and dark conductivity of carbon aerogels with various heat-treatment temperatures, T(HT), and densities are studied. Unlike the trend for as-prepared samples, the magnitude of the photoconductivity for heat-treated (T(HT) > 1050-degrees-C) carbon aerogel samples decreases as the sample density and heat-treatment temperature increase. We propose a model which quantitatively explains the observed temperature dependence of the photoconductivity data. Based on this model, we attribute the observed photoconductivity to photoholes present in the system. The number of defect states and their corresponding energy decrease with increasing T(HT) and increasing density. The decrease in the energy is attributed to a decrease in the screening effect of the defects on trapped charges. The effect of increasing the heat-treatment temperature causes the structure of the carbon aerogel to become more graphitic, especially for aerogel samples with higher mass density. C1 MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP REYNOLDS, GAM (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. NR 26 TC 11 Z9 11 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 1994 VL 49 IS 21 BP 15027 EP 15034 DI 10.1103/PhysRevB.49.15027 PG 8 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500026 ER PT J AU RUNGE, KJ ZIMANYI, GT AF RUNGE, KJ ZIMANYI, GT TI EXACT-DIAGONALIZATION STUDY OF THE ONE-DIMENSIONAL DISORDERED XXZ MODEL SO PHYSICAL REVIEW B LA English DT Article ID FERMION SYSTEMS; QUANTUM FLUIDS; BOSE SYSTEMS; LOCALIZATION; CHAIN; TRANSITION; SUPERCONDUCTIVITY; FIELD; STATE; HE-4 AB We investigate the one-dimensional quantum XXZ model in the presence of diagonal disorder. Recently the model has been analyzed with the help of field-theoretical renormalization-group methods, and a phase diagram has been predicted. We study the model with exact diagonalization techniques up to chain lengths of 16 sites. Using finite-size scaling methods we estimate critical exponents and the phase diagram and find reasonably good agreement with the field-theoretical results, namely, that any amount of disorder destroys the superfluidity for XXZ anisotropy DELTA between -1/2 and 1, while the superfluidity persists to finite disorder strength for -1 < DELTA < -1/2 and then undergoes a Kosterlitz-Thouless-type transition. C1 UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. RP LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. NR 37 TC 19 Z9 19 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1994 VL 49 IS 21 BP 15212 EP 15222 DI 10.1103/PhysRevB.49.15212 PG 11 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500047 ER PT J AU RADAELLI, PG JORGENSEN, JD SCHULTZ, AJ PENG, JL GREENE, RL AF RADAELLI, PG JORGENSEN, JD SCHULTZ, AJ PENG, JL GREENE, RL TI EVIDENCE OF APICAL OXYGEN IN ND2CUO(Y) DETERMINED BY SINGLE-CRYSTAL NEUTRON-DIFFRACTION SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON; ND2-XCEXCUO4; ND1.85CE0.15CUO4-DELTA; SUPERCONDUCTIVITY; ND2CUO4-DELTA; REDUCTION; GROWTH; ND; CE AB The defect structure of oxygenated and reduced Nd2CuOy (y almost-equal-to 4) was investigated by single-crystal neutron diffraction. Structural refinements indicate the presence of interstitial oxygen atoms in the ''apical'' 0(3) position, directly above or below the copper atoms. The occupancy of the apical oxygen site is approximately 0. 10 (per formula unit) for the oxygenated sample and approximately 0.04 for the reduced one. Both the in-plane 0(1) and the out-of-plane 0(2) oxygen sites were found to be deficient, but their-occupancy did not vary, within the error bars, between the two crystals. The difference in oxygen content between the two crystals, as calculated from the structural refinements, is consistent, within the error bars, with the thermogravimetric analysis values reported in the literature. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439. UNIV MARYLAND,DEPT PHYS & ASTRON,CTR SUPERCOND RES,COLL PK,MD 20742. RP RADAELLI, PG (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 23 TC 104 Z9 105 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 1994 VL 49 IS 21 BP 15322 EP 15326 DI 10.1103/PhysRevB.49.15322 PG 5 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500065 ER PT J AU MAKSIMOV, AA TARTAKOVSKII, II KLEIN, MV VEAL, BW AF MAKSIMOV, AA TARTAKOVSKII, II KLEIN, MV VEAL, BW TI 2-MAGNON LIGHT-SCATTERING IN YBA2CU3O6+X SINGLE-CRYSTALS NEAR THE METAL-INSULATOR-TRANSITION SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTORS; CU-O CHAINS; SPIN FLUCTUATIONS; RAMAN-SCATTERING; PHASE-SEPARATION; OXYGEN; TC; YBA2CU3O7-DELTA; LA2CUO4; SPECTRA AB Investigations of two-magnon Raman scattering (RS) were carried out on YBa2Cu3O6+x Single crystals with oxygen content near the metal-insulator transition. It was found that the chain oxygen reordering processes strongly influence the two-magnon RS spectrum. C1 UNIV ILLINOIS,SCI & TECHNOL CTR SUPERCOND,URBANA,IL 61801. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP MAKSIMOV, AA (reprint author), RUSSIAN ACAD SCI,INST SOLID STATE PHYS,142432 CHERNOGOLOVKA,RUSSIA. RI Maksimov, Andrei/C-5828-2017 NR 24 TC 10 Z9 10 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 1994 VL 49 IS 21 BP 15385 EP 15387 DI 10.1103/PhysRevB.49.15385 PG 3 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500080 ER PT J AU WANG, XD CAMPBELL, DK GUBERNATIS, JE AF WANG, XD CAMPBELL, DK GUBERNATIS, JE TI QUANTUM DOUBLE-WELL CHAIN - GROUND-STATE PHASES AND APPLICATIONS TO HYDROGEN-BONDED MATERIALS SO PHYSICAL REVIEW B LA English DT Article ID EXTENDED-HADRON MODELS; SIZE SCALING ANALYSIS; MONTE-CARLO; FIELD-THEORY; NONPERTURBATIVE METHODS; DOPED POLYACETYLENE; TRANSITIONS; SOLITONS; DYNAMICS; PRESSURE AB Extrapolating the results of hybrid quantum Monte Carlo simulations to the zero temperature and infinite-chain-length limits, we calculate the ground-state phase diagram of a system of quantum particles on a chain of harmonically coupled, symmetric, quartic double-well potentials. We show that the ground state of this quantum chain depends on two parameters, formed from the ratios of the three natural energy scales in the problem. As a function of these two parameters, the quantum ground state can exhibit either broken symmetry, in which the expectation values of the particle's coordinate are all nonzero (as would be the case for a classical chain), or restored symmetry, in which the expectation values of the particle's coordinate are all zero (as would be the case for a single quantum particle). In addition to the phase diagram as a function of these two parameters, we calculate the ground-state energy, an order parameter related to the average position of the particle, and the susceptibility associated with this order parameter. Further, we present an approximate analytic estimate of the phase diagram and discuss possible physical applications of our results, emphasizing the behavior of hydrogen halides under pressure. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP WANG, XD (reprint author), UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093, USA. NR 48 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1994 VL 49 IS 22 BP 15485 EP 15494 DI 10.1103/PhysRevB.49.15485 PG 10 WC Physics, Condensed Matter SC Physics GA NR701 UT WOS:A1994NR70100004 ER PT J AU ZONG, XF SHEN, CF LIU, S WU, ZC CHEN, Y AF ZONG, XF SHEN, CF LIU, S WU, ZC CHEN, Y TI RADIATION-INDUCED ELECTRICAL DEGRADATION IN CRYSTALLINE AL2O3 SO PHYSICAL REVIEW B LA English DT Article ID DIELECTRIC-BREAKDOWN; HIGH-TEMPERATURES; MGO CRYSTALS; INDUCED CONDUCTIVITY; INSULATORS; DIFFUSION; DEUTERIUM; HYDROGEN; DEFECTS; PURE AB Recent studies, simulating the behavior of insulating materials in a fusion device environment, show that under concurrent applications of radiation, applied electric field, and elevated temperature, they suffer degradation of their electrical properties. The goal of the present study is to address the mechanism of this radiation-induced electrical degradation and the defects involved. Our results show that when an Al2O3 crystal under a moderate electric field is irradiated with 1.8 MeV electrons at 773 K, the dc conductivity during and after irradiation increases rapidly above a critical dose and saturates after the conductivity increases by a factor of 10(3). There are two main conclusions. First, the electrical degradation is due to the charge of the electrons and holes created during radiation, rather than due to displacements of indigenous ions by elastic collisions with the energetic electrons. Second, the defects attending the observed electrical degradation are dislocations. Transmission electron microscopy studies revealed regions of large dislocation density distributed nonuniformly throughout the degraded area, with an overall average density of approximately 10(9) cm-2, as opposed to approximately 10(4) cm-2 in regions which were not electron irradiated nor subjected to an electric field. The concentration of point defects, as characterized by optical absorption and electron paramagnetic resonance, was below detectable limit. In addition, no second phase was observed. C1 US DOE,DIV MAT SCI,OFF BASIC ENERGY SCI,WASHINGTON,DC 20585. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. BOEING CO,DEF & SPACE GRP,SEATTLE,WA 98124. UNIV CARLOS 3,ESCUELA POLITECN SUPER,DEPT INGN,E-28913 LEGANES,SPAIN. IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. NR 43 TC 33 Z9 33 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1994 VL 49 IS 22 BP 15514 EP 15524 DI 10.1103/PhysRevB.49.15514 PG 11 WC Physics, Condensed Matter SC Physics GA NR701 UT WOS:A1994NR70100008 ER PT J AU THURSTON, TR HELGESEN, G HILL, JP GIBBS, D GAULIN, BD SIMPSON, PJ AF THURSTON, TR HELGESEN, G HILL, JP GIBBS, D GAULIN, BD SIMPSON, PJ TI X-RAY-SCATTERING AND NEUTRON-SCATTERING MEASUREMENTS OF 2 LENGTH SCALES IN THE MAGNETIC CRITICAL FLUCTUATIONS OF HOLMIUM SO PHYSICAL REVIEW B LA English DT Article ID R-POINT INSTABILITY; FIELD ISING-MODEL; LONG-RANGE ORDER; CRITICAL-BEHAVIOR; SRTIO3; PHASE; RESONANCE; RBCAF3; POLARIZATION; TRANSITIONS AB The short-ranged correlations associated with magnetic ordering in the rare-earth antiferromagnet holmium have been characterized in high-resolution x-ray- and neutron-scattering studies. For temperatures within about 2 K above T(N), the short-ranged magnetic fluctuations exhibit two length scales, instead of the single one expected in an ideal system. Well above T(N), the shorter of the two length scales exhibits power-law behavior consistent with normal critical fluctuations; the line shape in momentum space is well described by a Lorentzian, and the measured critical exponents are nu=0.54+/-0.04 and gamma=1.24+/-0.15. The longer of the two length scales is well described by a squared-Lorentzian line shape, and exhibits a power-law temperature dependence. Both the shorter and the longer length-scale fluctuations are approximately spatially isotropic. We propose that the longer length-scale fluctuations are related to random strain fields which are localized at or near the sample surfae. These results are reminiscent of behavior observed at the cubic-to-tetragonal structural phase transitions of some perovskite materials. C1 MIT,CAMBRIDGE,MA 02139. MCMASTER UNIV,HAMILTON L8S 4M1,ONTARIO,CANADA. UNIV WESTERN ONTARIO,LONDON N6A 3K7,ONTARIO,CANADA. INST ENERGITEKNIKK,N-2007 KJELLER,NORWAY. RP THURSTON, TR (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Hill, John/F-6549-2011; Piper, Walter/B-7908-2009 NR 56 TC 58 Z9 58 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1994 VL 49 IS 22 BP 15730 EP 15744 DI 10.1103/PhysRevB.49.15730 PG 15 WC Physics, Condensed Matter SC Physics GA NR701 UT WOS:A1994NR70100033 ER PT J AU KOGAN, VG AF KOGAN, VG TI PEARLS VORTEX NEAR THE FILM EDGE SO PHYSICAL REVIEW B LA English DT Article ID CRITICAL CURRENTS; THIN-FILMS AB The problem of a vortex situated near the edge of a thin superconducting film is solved. The flux associated with the vortex is shown to be less than the flux quantum in a broad domain adjacent to the film edge. The suppression of the vortex flux is strong in narrow thin-film bridges and scales with the ratio of the strip width to the film penetration depth. The magnetic moment of a vortex in a finite thin film is shown to depend on the sample size and on the vortex position. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP KOGAN, VG (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 15 TC 57 Z9 58 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1994 VL 49 IS 22 BP 15874 EP 15878 DI 10.1103/PhysRevB.49.15874 PG 5 WC Physics, Condensed Matter SC Physics GA NR701 UT WOS:A1994NR70100048 ER PT J AU YI, JC ZHANG, LZ CANRIGHT, GS AF YI, JC ZHANG, LZ CANRIGHT, GS TI PHASE-DIAGRAM OF THE 2-DIMENSIONAL ANDERSON-HUBBARD MODEL SO PHYSICAL REVIEW B LA English DT Article ID REAL-SPACE RENORMALIZATION; 2 DIMENSIONS; INSULATOR TRANSITION; LIQUID THEORY; DIRTY BOSONS; FERMI GAS; LOCALIZATION; BEHAVIOR; STATE AB We study the ground state of the two-dimensional Anderson-Hubbard model using a quantum real space renormalization group method. We obtain the phase diagram near half filling. The system is always insulating with disorder. At half filling, the system undergoes a transition from a gapless (Anderson) insulator to an incompressible (Mott-Hubbard) insulator as the interaction U reaches a critical value U(c). Away from half filling, the insulating phase is always gapless and is found to be controlled by the Anderson fixed point at half filling. This result is similar to that obtained in the corresponding one-dimensional system and suggests strongly the importance of the electron-electron correlation in this gapless insulating phase. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP YI, JC (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 33 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1994 VL 49 IS 22 BP 15920 EP 15927 DI 10.1103/PhysRevB.49.15920 PG 8 WC Physics, Condensed Matter SC Physics GA NR701 UT WOS:A1994NR70100053 ER PT J AU KIM, JT LEMBERGER, TR FOLTYN, SR WU, XD AF KIM, JT LEMBERGER, TR FOLTYN, SR WU, XD TI INFRARED STUDY OF SUPERCONDUCTIVITY IN YBA2(CU1-XMX)3O7-DELTA (M=ZN AND NI) SO PHYSICAL REVIEW B LA English DT Article ID GAP; STATE; BI2SR2CACU2O8+DELTA; YBA2CU3O7-DELTA; ABSENCE; FILMS; ANGLE AB We report the infrared reflectances R(nu,T) of YBa2(Cu1-xMx)3O7-delta films (M = Zn and Ni) for frequencies 50 cm-1 dJ/psi. The CP asymmetry can be generated due to strong or electromagnetic scattering in the final state, or due to long distance effects. The first two contributions give asymmetries of a few X 10(-3), in the standard model. The long distance effects are hard to estimate, but it cannot be excluded that they yield asymmetries of about 1%. C1 CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. RP DUNIETZ, I (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 23 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1994 VL 49 IS 11 BP 5904 EP 5907 DI 10.1103/PhysRevD.49.5904 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NR410 UT WOS:A1994NR41000027 ER PT J AU BITAR, KM EDWARDS, R HELLER, UM KENNEDY, AD GOTTLIEB, S KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC AF BITAR, KM EDWARDS, R HELLER, UM KENNEDY, AD GOTTLIEB, S KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC TI EFFECTS OF SPATIAL SIZE, LATTICE DOUBLING, AND SOURCE OPERATORS ON THE HADRON SPECTRUM WITH DYNAMICAL STAGGERED QUARKS AT 6/G(2) = 5.6 SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM CHROMODYNAMICS; 2 FLAVORS; FERMIONS; QCD; 6/G2=5.6 AB We have extended our previous study of the lattice QCD spectrum with two flavors of staggered dynamical quarks at 6/g2=5.6 and am(q)=0.025 and 0.01 to larger lattices, with better statistics and with additional sources for the propagators. The additional sources allowed us to estimate the DELTA mass and to measure the masses of all mesons whose operators are local in time. These mesons show good evidence for flavor symmetry restoration, except for the masses of the Goldstone and non-Goldstone pions. PCAC is observed in that m(pi)2 is-proportional-to m(q), and f(pi) is estimated. Use of undoubled lattices removes the problems with the pion propagator found in our earlier work. Previously we found a large change in the nucleon mass at a quark mass of am(q)=0.01 when we increased the spatial size from 12 to 16. No such effect is observed at the larger quark mass, am(q)=0.025. Two kinds of wall source were used, and we have found difficulties in getting consistent results for the nucleon mass between the two sources. C1 INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA. SWISS FED INST TECHNOL, IPS, CH-8092 ZURICH, SWITZERLAND. THINKING MACHINES CORP, CAMBRIDGE, MA 02139 USA. WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. UNIV CENT FLORIDA, DEPT PHYS, ORLANDO, FL 32816 USA. ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. UNIV NEW S WALES, SCH PHYS, KENSINGTON, NSW 2033, AUSTRALIA. RP FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. OI Heller, Urs M./0000-0002-2780-5584 NR 28 TC 15 Z9 15 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD JUN 1 PY 1994 VL 49 IS 11 BP 6026 EP 6038 DI 10.1103/PhysRevD.49.6026 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NR410 UT WOS:A1994NR41000039 ER PT J AU CHU, MC GRANDY, JM HUANG, S NEGELE, JW AF CHU, MC GRANDY, JM HUANG, S NEGELE, JW TI EVIDENCE FOR THE ROLE OF INSTANTONS IN HADRON STRUCTURE FROM LATTICE QCD SO PHYSICAL REVIEW D LA English DT Article ID ANTIQUARK CHARGE-DISTRIBUTIONS; QUANTUM CHROMODYNAMICS; QUANTITATIVE THEORY; VACUUM; LIQUID; CONFINEMENT; CURRENTS; MESONS; QUARKS AB Cooling is used as a filter on a set of gluon fields sampling the Wilson action to selectively remove essentially all fluctuations of the gluon field except for the instantons. The close agreement between quenched lattice QCD results with cooled and uncooled configurations for vacuum correlation functions of hadronic currents and for density-density correlation functions in hadronic bound states provides strong evidence for the dominant role of instantons in determining light hadron structure and quark propagation in the QCD vacuum. C1 LOS ALAMOS NATL LAB,T8 GRP,LOS ALAMOS,NM 87545. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. MIT,CTR THEORET PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. RP CHU, MC (reprint author), CALTECH,KELLOGG RADIAT LAB,106-38,PASADENA,CA 91125, USA. NR 30 TC 207 Z9 209 U1 1 U2 4 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 1994 VL 49 IS 11 BP 6039 EP 6050 DI 10.1103/PhysRevD.49.6039 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NR410 UT WOS:A1994NR41000040 ER PT J AU YOUNG, PE ESTABROOK, KG AF YOUNG, PE ESTABROOK, KG TI ANGULARLY RESOLVED OBSERVATIONS OF SIDESCATTERED LASER-LIGHT FROM LASER-PRODUCED PLASMAS SO PHYSICAL REVIEW E LA English DT Article ID MU-M LASER; STIMULATED BRILLOUIN-SCATTERING; PARAMETRIC-INSTABILITIES; ELECTROMAGNETIC-WAVES; INHOMOGENEOUS PLASMAS; BACKSCATTERED LIGHT; 2-OMEGA-0 EMISSION; CRITICAL SURFACE; FILAMENTATION; PULSATION AB Small scale structure is observed in angularly resolved measurements of scattered laser light from 1.06 mum laser irradiations of CH targets. The structure size varies as the laser spot diameter is changed. The structure is consistent with light produced by the stimulated Brillouin sidescattering instability. The overall angular dependence of the scattered laser light intensity is compared to the distribution predicted by convective growth of stimulated Brillouin sidescattering. Two-dimensional plasma effects are shown to be important in determining the angular distribution of the scattered light. RP YOUNG, PE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 34 TC 10 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5556 EP 5564 DI 10.1103/PhysRevE.49.5556 PN B PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000005 ER PT J AU VITELLO, PA PENETRANTE, BM BARDSLEY, JN AF VITELLO, PA PENETRANTE, BM BARDSLEY, JN TI SIMULATION OF NEGATIVE-STREAMER DYNAMICS IN NITROGEN SO PHYSICAL REVIEW E LA English DT Article ID ATMOSPHERIC-PRESSURE; POSITIVE POINT; PROPAGATION; BREAKDOWN; CORONA; DISCHARGE; PLANE; VOLTAGE; OVERVOLTAGE; IMPULSE AB In this paper we consider how the dynamical characteristics of streamers are determined by their multidimensional structure. Results from two-dimensional (three-dimensional, cylindrically symmetric) simulations are presented at atmospheric pressure for N2 and plane-parallel electrodes. Our high-spatial-resolution simulations are based on a numerical model which is able to treat a wide range of electrode configurations (including point-to-plane and other complex configurations). This model has allowed us to make a more thorough investigation of streamer morphology than has been attempted previously. Detailed knowledge of the streamer morphology and its evolution are vital to the application of streamer discharges to processes such as the destruction of airborne toxic chemicals. We find that the morphology is complex, even for plane-parallel electrodes, with a range of radial structures that become evident at different phases of the streamer evolution. Several distinct phases of evolution are clearly discernible. We demonstrate the transition between these phases, showing how the self-consistent radial and axial structure varies with time. RP VITELLO, PA (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 53 TC 168 Z9 176 U1 0 U2 14 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5574 EP 5598 DI 10.1103/PhysRevE.49.5574 PN B PG 25 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000007 ER PT J AU GODBERT, L CALISTI, A STAMM, R TALIN, B LEE, R KLEIN, L AF GODBERT, L CALISTI, A STAMM, R TALIN, B LEE, R KLEIN, L TI PLASMA DIAGNOSTICS WITH SPECTRAL PROFILE CALCULATIONS SO PHYSICAL REVIEW E LA English DT Article ID C-IV; DENSE-PLASMAS; LINE-SHAPES; TRANSITIONS; IONS AB A method is presented to interpret spectroscopic measurements to obtain a diagnostic of conditions in hot, dense plasmas using a fast computer code to calculate the theoretical profiles of the ionic spectra emitted. The method employed involves the computation of the spectral shape of the ionic transitions with the plasma electron temperature and density as parameters, a convolution of this theoretical profile with the instrument function, and a comparison of the resulting profile with the experimental spectrum. The computation is performed using an atomic physics data set coupled to a fast version of a line shape code that is capable of considering an extremely large number of sublevels for each transition. The plasma electron density and temperature are the only free parameters and the complex shape of the calculated line profile serves as a signature of the plasma conditions. Published spectral measurements of several ionic transitions of Li-like C and N in a hydrogen plasma are considered as an example. For certain of these transitions, the possibility of the observation of an ion dynamics effect on the ionic emitters is discussed. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HOWARD UNIV,DEPT PHYS & ASTRON,CTR STUDY TERR & EXTRATERR ATMOSPHERES,WASHINGTON,DC 20059. RP GODBERT, L (reprint author), UNIV PROVENCE,CTR ST JEROME,DEPT PHYS INTERACT ION & MOLEC,CASE 232,F-13397 MARSEILLE,FRANCE. OI Calisti, Annette/0000-0001-6727-9286 NR 19 TC 16 Z9 16 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5644 EP 5651 DI 10.1103/PhysRevE.49.5644 PN B PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000012 ER PT J AU MANDELBAUM, P BEHAR, E SEELY, JF FELDMAN, U BROWN, CM HAMMEL, BA BACK, CA LEE, RW KANIA, DR BARSHALOM, A AF MANDELBAUM, P BEHAR, E SEELY, JF FELDMAN, U BROWN, CM HAMMEL, BA BACK, CA LEE, RW KANIA, DR BARSHALOM, A TI SPACE-RESOLVED DENSITY DIAGNOSTIC OF A HIGHLY IONIZED HOLMIUM (Z=67) LASER-PRODUCED PLASMA FROM 3D(10)4L-3D(10)4L'CUI-LIKE LINES SO PHYSICAL REVIEW E LA English DT Article ID CU-I; SPECTRA; ATOMS AB A space-resolved electron density diagnostic of a holmium laser-produced plasma has been performed using the intensity ratios of Cu I-like 3d(10)4l-3d(10)4l' lines. The atomic theoretical model of the Cu I-like ion included the 3d10nl levels with n = 4,5 and l = s,p,d,f. The effect of line absorption at high electron densities is discussed and the atomic data obtained with the HULLAC computer code are compared with previously published data. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP MANDELBAUM, P (reprint author), HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. NR 9 TC 1 Z9 1 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5652 EP 5655 DI 10.1103/PhysRevE.49.5652 PN B PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000013 ER PT J AU HERRUP, DA KINNEY, W LAMM, MJ MOKHTARANI, A AF HERRUP, DA KINNEY, W LAMM, MJ MOKHTARANI, A TI COMPENSATION OF TIME-DEPENDENT PERSISTENT CURRENT EFFECTS IN SUPERCONDUCTING SYNCHROTRONS SO PHYSICAL REVIEW E LA English DT Article AB Persistent currents in superconducting accelerator magnets are caused by the magnetization of the superconducting filaments in the field of the magnet itself. The magnetized filaments create additional field distortions which can have an important effect on beam dynamics. During the initial operation of the Tevatron as a colliding beam accelerator, the chromaticities at the injection energy were found to be time dependent, leading to instabilities and particle loss during injection and at the start of acceleration. Laboratory measurements on single Tevatron dipole magnets indicated that these effects were due to time-dependent persistent current phenomena. Using additional laboratory measurements and beam observations, we have developed a set of procedures to compensate the time-dependent chromaticities due to the persistent currents. The application of these procedures has eliminated all problems caused by time-dependent persistent current effects. We will discuss the general problem of persistent current distortions in superconducting accelerators, and, then, the laboratory measurements, the beam observations, and the successful implementation of the correction schemes. While these procedures have worked well, they have limitations which will be discussed, as well as possible future improvements and implications for future projects. RP HERRUP, DA (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5660 EP 5667 DI 10.1103/PhysRevE.49.5660 PN B PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000015 ER PT J AU CHEN, CP DAVIDSON, RC AF CHEN, CP DAVIDSON, RC TI NONLINEAR PROPERTIES OF THE KAPCHINSKIJ-VLADIMIRSKIJ EQUILIBRIUM AND ENVELOPE EQUATION FOR AN INTENSE CHARGED-PARTICLE BEAM IN A PERIODIC FOCUSING FIELD SO PHYSICAL REVIEW E LA English DT Article ID EMITTANCE AB The nonlinear properties of the Kapchinskij-Vladimirskij (KV) equilibrium and envelope equation are examined for an intense charged-particle beam propagating through an applied periodic solenoidal focusing magnetic field, including the effects of the self-electric and self-magnetic fields associated with the beam space charge and current. It is found that the beam emittance is proportional to the maximum canonical angular momentum achieved by the particles within the KV distribution. The Poincare mapping technique is used to determine systematically the axial dependence of the radius of the matched (equilibrium) beam and to study nonlinear behavior in the nonequilibrium beam envelope oscillations. It is shown that the nonequilibrium beam envelope oscillations exhibit nonlinear resonances and chaotic behavior for periodic focusing magnetic fields and sufficiently high beam densities. Certain correlations are found between the nonlinear resonances and well-known instabilities for the KV equilibrium. It is also shown, in agreement with previous studies, that there exists a uniquely matched beam in the parameter regime of practical interest, i.e., sigma0 < 90-degrees, where sigma0 is the vacuum phase advance over one axial period of the focusing field. The nonlinear resonances and chaotic behavior in the nonequilibrium beam envelope oscillations may play an important role in mismatched or multiple beam transport, including emittance growth and beam halo formation and evolution. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RP CHEN, CP (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 21 TC 53 Z9 61 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5679 EP 5687 DI 10.1103/PhysRevE.49.5679 PN B PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000017 ER PT J AU WANG, Y BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD CHAO, AW COLLINS, J DERENCHUK, V DUTT, S EAST, G ELLISON, M FRIESEL, D HAMILTON, B HUANG, H JONES, WP LEE, SY LI, D LIU, JY MINTY, MG NG, KY PEI, X RIABKO, A SLOAN, T SYPHERS, M YAN, YT ZHANG, PL AF WANG, Y BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD CHAO, AW COLLINS, J DERENCHUK, V DUTT, S EAST, G ELLISON, M FRIESEL, D HAMILTON, B HUANG, H JONES, WP LEE, SY LI, D LIU, JY MINTY, MG NG, KY PEI, X RIABKO, A SLOAN, T SYPHERS, M YAN, YT ZHANG, PL TI EFFECTS OF TUNE MODULATION ON PARTICLES TRAPPED IN ONE-DIMENSIONAL RESONANCE ISLANDS SO PHYSICAL REVIEW E LA English DT Article ID SYNCHROTRON; BEAM AB The response of particles trapped in one-dimensional resonance islands to betatron tune modulation resembles, yet is not equivalent to, that of a parametric resonant system. Experimental data obtained at Indiana University Cyclotron Facility for the fourth-order resonance islands have confirmed this characteristic feature. The beam, driven by betatron tune modulation, was observed to travel from near the center of resonance islands toward the separatrix. The experimental data are characterized by the onset of a large response at a critical modulation amplitude and frequency, which are compared with theoretical models. Possible future experiments are suggested. C1 SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP WANG, Y (reprint author), INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405, USA. NR 20 TC 15 Z9 15 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5697 EP 5705 DI 10.1103/PhysRevE.49.5697 PN B PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000019 ER PT J AU LEE, SY CAUSSYN, DD ELLISON, M HEDBLOM, K HUANG, H LI, D LIU, JY NG, KY RIABKO, A YAN, YT AF LEE, SY CAUSSYN, DD ELLISON, M HEDBLOM, K HUANG, H LI, D LIU, JY NG, KY RIABKO, A YAN, YT TI PARAMETRIC RESONANCES IN SYNCHROTRONS WITH 2 RF SYSTEMS SO PHYSICAL REVIEW E LA English DT Article AB When a double rf system is subjected to sinusoidal phase modulation, the Poincare surfaces of the section display a rich spectrum of resonance islands. Stable and unstable fixed points of these resonance islands form a tree of bifurcation branches which can be explained as parametric resonances generated by external phase modulation. A semianalytic determination of the condition for the bifurcation of fixed points is presented for an autonomous Hamiltonian of one degree of freedom with sinusoidal time dependent perturbation. C1 UNIV UPPSALA,SVEDBERG LAB,S-75121 UPPSALA,SWEDEN. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. SUPERCOND SUPER COLLIDER LAB,DALLAS,TX 75237. RP LEE, SY (reprint author), INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405, USA. NR 13 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5717 EP 5721 DI 10.1103/PhysRevE.49.5717 PN B PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000021 ER PT J AU GODBERT, L CALISTI, A STAMM, R TALIN, B GLENZER, S KUNZE, HJ NASH, J LEE, R KLEIN, L AF GODBERT, L CALISTI, A STAMM, R TALIN, B GLENZER, S KUNZE, HJ NASH, J LEE, R KLEIN, L TI PLASMA SPECTROSCOPY OF N=4 TO 3 C-IV AND N-V LINES IN HOT AND DENSE-PLASMAS SO PHYSICAL REVIEW E LA English DT Note ID SPECTRAL-LINES; IONS; LI AB The spectral line profiles of n = 4 to 3 transitions emitted by the Li-like ions of carbon and nitrogen in a hot, dense hydrogen plasma are calculated and compared to measurements. The excellent agreement with the independently measured temperature and density establishes the theoretical model and validates its use as a plasma diagnostic. The effect of spectral resolution on the accuracy of the determination of the plasma conditions is examined. C1 RUHR UNIV,INST EXPTL PHYS 5,D-44780 BOCHUM,GERMANY. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP GODBERT, L (reprint author), UNIV PROVENCE,CTR ST JEROME,PIIM CASE 232,F-13397 MARSEILLE 20,FRANCE. OI Calisti, Annette/0000-0001-6727-9286 NR 12 TC 18 Z9 18 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP 5889 EP 5892 DI 10.1103/PhysRevE.49.5889 PN B PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000048 ER PT J AU KWON, I COLLINS, LA KRESS, JD TROULLIER, N LYNCH, DL AF KWON, I COLLINS, LA KRESS, JD TROULLIER, N LYNCH, DL TI MOLECULAR-DYNAMICS SIMULATIONS OF HOT, DENSE HYDROGEN SO PHYSICAL REVIEW E LA English DT Note ID SOLID HYDROGEN; HIGH-PRESSURE; PLASMAS; FUSION; HELIUM; MODEL AB Quantum mechanical molecular dynamics simulations have been performed in order to understand the structure and dynamics of hot, dense hydrogen. Both density functional and tight-binding methods were employed to represent the interatomic forces. Pair-correlation functions and self-diffusion coefficients are compared with other models over a range of temperatures (1-5 eV) and densities (0.1-3 g/cm3). We find that quantum mechanical many-body interactions are crucial to modeling this regime. In addition, we examine transient phenomena and find evidence for short-lived complexes even at high temperatures. C1 UNIV MINNESOTA,DEPT COMP SCI,MINNEAPOLIS,MN 55455. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455. RP KWON, I (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 32 TC 14 Z9 14 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1994 VL 49 IS 6 BP R4771 EP R4775 PN A PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW029 UT WOS:A1994NW02900003 ER PT J AU BROW, RK ARENS, CM YU, X DAY, E AF BROW, RK ARENS, CM YU, X DAY, E TI AN XPS STUDY OF IRON PHOSPHATE-GLASSES SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Article ID X-RAY PHOTOELECTRON; SPECTROSCOPY; MOSSBAUER; OXIDES; NMR AB X-ray photoelectron spectroscopy (XPS) has been used to characterise the short range structure of iron phosphate glasses. Quantitative Fe2+/Fe3+ ratios determined by decomposing the Fe3p spectra are in good agreement with valence measurements made by Mossbauer spectroscopy. Fe2+ is preferred when [Fe]/[P] is low, whereas Fe3+ is preferred when [Fe]/[P] is greater than approximately 0.4. Increasing [Fe]/[P] decreases the bridging to nonbridging oxygen ratio determined from the O1s spectra. It is shown that a quantitative relationship exists between this latter ratio and the glass composition and average Fe valence. C1 UNIV MISSOURI,ROLLA,MO 65401. RP BROW, RK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 27 TC 69 Z9 69 U1 3 U2 23 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD JUN PY 1994 VL 35 IS 3 BP 132 EP 136 PG 5 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA NX031 UT WOS:A1994NX03100006 ER PT J AU HERZENBERG, CL AF HERZENBERG, CL TI MOIRE INTERFERENCE AND THE REPRESENTATION OF QUANTUM EFFECTS IN EUCLIDEAN SPACE-TIME SO PHYSICS ESSAYS LA English DT Article DE EUCLIDEAN SPACE-TIME; MOIRE EFFECT; QUANTUM MECHANICS; WAVE FUNCTIONS; INTERFERENCES AB Spatiotemporal interference effects in four-dimensional Euclidean space-time models are examined with the use of moire patterns. Analysis reveals effects and behavior resembling those of elementary quantum mechanical wave functions. RP HERZENBERG, CL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV TORONTO PRESS INC PI ONTARIO PA JOURNALS DEPT, 5201 DUFFERIN ST, ONTARIO NORTH YORK M3H 5T8, CANADA SN 0836-1398 J9 PHYS ESSAYS JI Phys. Essays PD JUN PY 1994 VL 7 IS 2 BP 210 EP 222 PG 13 WC Physics, Multidisciplinary SC Physics GA PY495 UT WOS:A1994PY49500010 ER PT J AU MIKAELIAN, KO AF MIKAELIAN, KO TI OBLIQUE SHOCKS AND THE COMBINED RAYLEIGH-TAYLOR, KELVIN-HELMHOLTZ, AND RICHTMYER-MESHKOV INSTABILITIES SO PHYSICS OF FLUIDS LA English DT Letter ID DENSITY-STRATIFIED INTERFACES; REFRACTION; WAVES AB This Letter considers the evolution of perturbations at an interface between two fluids subjected to an oblique shock. The normal component of the shock generates the Richtmyer-Meshkov (RM) instability, and the parallel component generates the Kelvin-Helmholtz (KH) instability. If a constant normal acceleration is also present it induces the Rayleigh-Taylor (RT) instability or, depending on the sign of gA (g = acceleration, A = Atwood number), it acts to stabilize the KH and RM instabilities. Treating the shock as an instantaneous acceleration, analytic formulas are derived for the evolution of the perturbations. This Letter illustrates with an application to inertial-confinement-fusion capsules. RP MIKAELIAN, KO (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 13 TC 11 Z9 11 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JUN PY 1994 VL 6 IS 6 BP 1943 EP 1945 DI 10.1063/1.868198 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NQ069 UT WOS:A1994NQ06900001 ER PT J AU CREMER, MA MCMURTRY, PA KERSTEIN, AR AF CREMER, MA MCMURTRY, PA KERSTEIN, AR TI EFFECTS OF TURBULENCE LENGTH-SCALE DISTRIBUTION ON SCALAR MIXING IN HOMOGENEOUS TURBULENT-FLOW SO PHYSICS OF FLUIDS LA English DT Article ID DIRECT NUMERICAL SIMULATIONS; TRANSPORT AB The linear eddy mixing model is used to study effects of the turbulence length-scale distribution on the transient evolution of a passive scalar in a statistically steady homogeneous turbulent flow. Model simulations are carried out using both wide-band length-scale distributions reflecting high-Reynolds-number scaling, and narrow-band (in effect, low-Reynolds-number) distributions. The two cases are found to exhibit qualitative differences in mixing behavior. These differences are interpreted mechanistically. The narrow-band case yields the best agreement with published direct numerical simulation results, suggesting that those results are, in effect, low-Reynolds-number results not readily extrapolated to high-Reynolds-number mixing. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. RP CREMER, MA (reprint author), UNIV UTAH,DEPT MECH ENGN,SALT LAKE CITY,UT 84112, USA. NR 10 TC 16 Z9 16 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JUN PY 1994 VL 6 IS 6 BP 2143 EP 2153 DI 10.1063/1.868439 PG 11 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NQ069 UT WOS:A1994NQ06900021 ER PT J AU SOBEHART, JR FARENGO, R AF SOBEHART, JR FARENGO, R TI PARTICLE CONFINEMENT IN TIME-DEPENDENT FIELDS SO PHYSICS OF PLASMAS LA English DT Article AB The confinement of charged particles by linear, time-dependent fields with arbitrary pulse shape is studied. It is assumed that the trapped particles are perturbed by collisions with a neutral background gas. The spatial dispersion and energy of the trapped particles are determined using an asymptotic expansion based on a singular perturbation approach in terms of the momentum exchanged during collisions. Parametric instabilities, which result in the destruction of the confinement, are identified for different pulse shapes. C1 COMIS NACL ENGERGIA ATOM,DIV FUS NUCL GERENCIA DESARROLLO,RA-1429 BUENOS AIRES,ARGENTINA. RP SOBEHART, JR (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS B-258,LOS ALAMOS,NM 87545, USA. NR 8 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1827 EP 1831 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600011 ER PT J AU MARTINEZ, DO CHEN, SY MATTHAEUS, WH AF MARTINEZ, DO CHEN, SY MATTHAEUS, WH TI LATTICE BOLTZMANN MAGNETOHYDRODYNAMICS SO PHYSICS OF PLASMAS LA English DT Article ID NAVIER-STOKES EQUATION; 2-DIMENSIONAL MAGNETOHYDRODYNAMICS; GAS AUTOMATA; MODEL AB Lattice gas and lattice Boltzmann methods are recently developed numerical schemes for simulating a variety of physical systems. In this paper a new lattice Boltzmann model for modeling two-dimensional (2-D) incompressible magnetohydrodynamics (MHD) is presented. The current model fully utilizes the flexibility of the lattice Boltzmann method in comparison with previous lattice gas and lattice Boltzmann MHD models, reducing the number of moving directions from 36 in other models to 12 only. To increase computational efficiency, a simple single time relaxation rule is used for collisions, which directly controls the transport coefficients. The bidirectional streaming process of the particle distribution function in this paper is similar to the original model [H. Chen and W. H. Matthaeus, Phys. Rev. Lett. 58, 1845 (1987), S. Chen et al., Phys. Rev. Lett. 67, 3776 (1991)], but has been greatly simplified, affording simpler implementation of boundary conditions and increasing the feasibility of extension into a workable three-dimensional (3-D) model. Analytical expressions for the transport coefficients are presented. Also, as example cases, numerical calculation for the Hartmann flow is performed, showing a good agreement between the theoretical prediction and numerical simulation, and a sheet-pinch simulation is performed and compared with the results obtained with a spectral method. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP MARTINEZ, DO (reprint author), UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716, USA. RI Chen, Shiyi/A-3234-2010 NR 24 TC 52 Z9 58 U1 0 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1850 EP 1867 PG 18 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600014 ER PT J AU CRADDOCK, GG KONIGES, AE CROTINGER, JA DIAMOND, PH NEWMAN, DE TERRY, PW AF CRADDOCK, GG KONIGES, AE CROTINGER, JA DIAMOND, PH NEWMAN, DE TERRY, PW TI EFFECTS OF NONLINEAR ELECTRON DYNAMICS IN A FLUID MODEL OF COLLISIONLESS TRAPPED-ELECTRON MODE TURBULENCE SO PHYSICS OF PLASMAS LA English DT Article ID DRIFT-WAVE TURBULENCE; NUMERICAL-SIMULATION; SPECTRAL TRANSFER; TOKAMAKS AB The role of the electron nonlinearity on saturation levels and particle transport in collisionless trapped electron mode turbulence is examined numerically using a two-dimensional fluid model. It is found that the removal of the electron nonlinearity results in an order of magnitude increase in fluctuation and particle transport levels. In addition, the qualitative behavior of the saturated state changes distinctly, including a decrease in RMS wave number in both cross-field directions, deviations from isotropy, changes in transport scalings, and changes in the spectral flow of energy. These results indicate that the electron nonlinearity is responsible for an efficient transfer of internal energy to small dissipation scales, thus resulting in lower fluctuation levels than predicted by ion mode coupling alone. The electron nonlinearity also decreases the phase angle between the density and potential leading to a decrease in the driving source. These results underscore the importance of the cross-correlation on saturation and demonstrate that numerical or theoretical use of ''idelta'' models to describe weakly collisional or collisionless trapped-electron mode turbulence is not appropriate. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. UNIV WISCONSIN,MADISON,WI 53706. RP CRADDOCK, GG (reprint author), LAWRENCE LIVERMORE NATL LAB,NATL ENERGY RES SUPERCOMP CTR,LIVERMORE,CA 94550, USA. NR 13 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1877 EP 1881 DI 10.1063/1.870643 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600017 ER PT J AU CRADDOCK, GG DIAMOND, PH ONO, M BIGLARI, H AF CRADDOCK, GG DIAMOND, PH ONO, M BIGLARI, H TI THEORY OF ION BERNSTEIN WAVE-INDUCED SHEAR SUPPRESSION OF TURBULENCE SO PHYSICS OF PLASMAS LA English DT Article ID EDGE TURBULENCE; IMPROVED CONFINEMENT; CURRENT DRIVE; TOKAMAK; ROTATION; FIELD AB The theory of radio frequency induced ion Bernstein wave- (IBW) driven shear flow in the edge is examined, with the goal of application of shear suppression of fluctuations. This work is motivated by the observed confinement improvement on IBW heated tokamaks [Phys. Fluids B 5, 241 (1993)], and by previous low-frequency work on RF-driven shear flows [Phys. Rev. Lett. 67, 1535 (1991)]. It is found that the poloidal shear flow is driven electrostatically by both Reynolds stress and a direct ion momentum source, analogous to the concepts of helicity injection and electron momentum input in current drive, respectively. Flow drive by the former does not necessarily require momentum input to the plasma to induce a shear flow. For IBW, the direct ion momentum can be represented by direct electron momentum input, and a charge separation induced stress that imparts little momentum to the plasma. The derived E(r) profile due to IBW predominantly points inward, with little possibility of direction change, unlike low-frequency Alfvenic RF drive. The profile scale is set by the edge density gradient and electron dissipation. Due to the electrostatic nature of ion Bernstein waves, the poloidal flow contribution dominates in E(r). Finally, the necessary edge power absorbed for shear suppression on Princeton Beta Experiment-Modified (PBX-M) [9th Topical Conference on Radio Frequency Power in Plasmas, Charleston, SC, 1991 (American Institute of Physics, New York, 1991), p. 129] is estimated to be 100 kW distributed over 5 cm. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. GEN ATOM CO,SAN DIEGO,CA 92138. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP CRADDOCK, GG (reprint author), LAWRENCE LIVERMORE NATL LAB,NATL ENERGY RES SUPERCOMP CTR,LIVERMORE,CA 94551, USA. NR 31 TC 35 Z9 35 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1944 EP 1952 DI 10.1063/1.870650 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600024 ER PT J AU REYNDERS, JVW AF REYNDERS, JVW TI FINITE-BETA MODIFICATION OF THE ION-TEMPERATURE-GRADIENT-DRIVEN INSTABILITY IN A SHEARED SLAB GEOMETRY SO PHYSICS OF PLASMAS LA English DT Article ID GYROKINETIC PARTICLE SIMULATION; DRIFT INSTABILITIES; TRANSPORT AB A coupled system of linear integral equations are derived from the electromagnetic gyrokinetic equations and solved in straight and sheared slab geometries. Simulation results of a finite-beta modified ion-temperature-gradient-driven instability in a sheared geometry are presented. It is shown for typical tokamak parameters that the fundamental l = 0 slab mode can be completely stabilized at beta almost-equal-to 1% while the l = 1 slab mode persists. RP REYNDERS, JVW (reprint author), LOS ALAMOS NATL LAB,ADV COMP LAB,LOS ALAMOS,NM 87544, USA. NR 11 TC 13 Z9 14 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1953 EP 1961 DI 10.1063/1.870651 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600025 ER PT J AU DENAVIT, J PHILLION, DW AF DENAVIT, J PHILLION, DW TI LASER IONIZATION AND HEATING OF GAS TARGETS FOR LONG-SCALE-LENGTH INSTABILITY EXPERIMENTS SO PHYSICS OF PLASMAS LA English DT Article ID PLASMA; BACKSCATTER; NOVA; HOT AB This paper examines the use of gas targets to create low- and mid-Z plasmas almost-equal-to 3 mm in size at 5% to 10% critical density for green and blue light (n(e) almost-equal-to 2 X 10(20) to 10(21) cm-3) with an electron temperature of several keV. At sufficiently high intensities (almost-equal-to 10(14) W/cm2) the gas is ionized and heated by a laser absorption wave propagating faster than the sound speed. For pulses under 2 ns, the bulk of the plasma remains stationary, resulting in efficient heating minimizing density and velocity gradients, which are particularly important for instability thresholds in nonuniform plasmas. The propagation of a laser absorption wave in a preionized plasma is derived analytically. Ionization resulting from multiphoton and electron avalanche processes is studied by numerical methods and dimensional analysis. This establishes the length and time scales over which an absorption wave can be observed. Computer simulations, using the LASNEX code, are presented for several implementations of this concept, applicable to the relevant regime for inertial confinement fusion. These examples include a gas jet (almost-equal-to 3 x 1 mm in cross section), 3 to 4 mm diameter gas balloons, and gas puffs generated by exploding a foil with a low-energy prepulse (almost-equal-to 200 J). RP DENAVIT, J (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 25 TC 64 Z9 65 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1971 EP 1984 DI 10.1063/1.870653 PG 14 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600027 ER PT J AU BATHA, SH BRADLEY, KS DRAKE, RP ESTABROOK, K KRUER, WL MONTGOMERY, DS REMINGTON, BA AF BATHA, SH BRADLEY, KS DRAKE, RP ESTABROOK, K KRUER, WL MONTGOMERY, DS REMINGTON, BA TI INTENSITY SCALING AND SATURATION OF STIMULATED RAMAN FORWARD SCATTERING SO PHYSICS OF PLASMAS LA English DT Article ID LASER-PRODUCED PLASMAS; MU-M LASER; INHOMOGENEOUS-PLASMA; BRILLOUIN-SCATTERING; BACKWARD; LIGHT; SIMULATION; LANGMUIR; WAVES; INSTABILITIES AB The intensity scaling of stimulated Raman forward scattering has been measured in preformed laser-produced plasmas. It was found that predictions based on linear convective theory were consistent with the amount of scattered light measured when the laser intensity was less than about 1 X 10(15) W/cm2. No increase in the amount of scattered light was found for higher intensities. The measured saturation level is compared to several nonlinear models: pump depletion, coupling to Langmuir and ion-acoustic waves, ponderomotive detuning, wave breaking, and particle trapping. It is found that saturation models based on ponderomotive detuning and on coupling to Langmuir and ion-acoustic waves are consistent with the experiment. C1 LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST,LIVERMORE,CA 94551. RI Drake, R Paul/I-9218-2012; OI Drake, R Paul/0000-0002-5450-9844; Montgomery, David/0000-0002-2355-6242 NR 45 TC 2 Z9 3 U1 0 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1985 EP 1996 DI 10.1063/1.870654 PG 12 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600028 ER PT J AU SEELY, JF BROWN, CM HOLLAND, GE LEE, RW MORENO, JC MACGOWAN, BJ BACK, CA DASILVA, LB WAN, AS AF SEELY, JF BROWN, CM HOLLAND, GE LEE, RW MORENO, JC MACGOWAN, BJ BACK, CA DASILVA, LB WAN, AS TI IMAGING OF LASER-IRRADIATED TARGETS AT A WAVELENGTH OF 33.8-ANGSTROM USING A NORMAL-INCIDENCE MULTILAYER MIRROR SO PHYSICS OF PLASMAS LA English DT Article ID PLASMAS; REGION AB The morphology of the 33.8 angstrom emission from laser-irradiated targets was studied using a concave mirror with a W/B4C multilayer coating. The mirror had peak normal-incidence reflectance of 1.8% at a wavelength of 33.8 angstrom. The emissions from a variety of targets were imaged on film with a spatial resolution of 30 mum in the target plane. Radiatively heated, low-density plastic and silica foams, x-ray laser targets, and a gas-filled enclosure were imaged. Several targets were simultaneously imaged at wavelengths of 33.8 and 130 angstrom using two normal-incidence microscopes. C1 SFA INC,LANDOVER,MD 20785. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SEELY, JF (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1997 EP 2002 DI 10.1063/1.870655 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600029 ER PT J AU SLUTZ, SA POUKEY, JW POINTON, TD AF SLUTZ, SA POUKEY, JW POINTON, TD TI SIMULATIONS OF MAGNETICALLY INSULATED MULTISTAGE ION DIODES SO PHYSICS OF PLASMAS LA English DT Article ID APPLIED-B DIODES; ELECTROMAGNETIC STABILITY; BEAM ACCELERATION; DIVERGENCE AB An analytic theory for magnetically insulated multistage acceleration of high intensity ion beams has been presented [J. Appl. Phys. 67, 6705 (1990)]. This theory predicts an operating behavior that is strongly dependent on the electron density profile. A numerical investigation, using both two-dimensional (2-D) and three-dimensional (3-D) particle-in-cell codes, of multistage diode operating behavior is presented in this paper. The 2-D results are consistent with the analytic results based on a very thin electron sheath. In contrast, the 3-D simulations are consistent with the analytic theory based on a thick electron sheath. The different results are due to the growth of electromagnetic instabilities in the 3-D simulations, which generate fluctuations that broaden the electron sheath. The 2-D simulations did not properly model these instabilities because they propagate in the direction that was ignored. In addition to these results, the 3-D code was used to study the generation of ion divergence due to the instability induced fluctuations. These simulations show a positive correlation between the ion current density (normalized for space-charge effects) and the growth of transverse ion velocities during acceleration. It is found that, at low beam current densities, ion divergence can be reduced significantly by postacceleration. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 25 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 2072 EP 2081 DI 10.1063/1.870602 PG 10 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600037 ER PT J AU HAHM, TS TANG, WM AF HAHM, TS TANG, WM TI INFLUENCE OF RADIAL ELECTRIC-FIELD ON ALFVEN-TYPE INSTABILITIES SO PHYSICS OF PLASMAS LA English DT Note ID KINETIC BALLOONING MODES; EDGE-LOCALIZED MODES; DIII-D; TOKAMAKS; PARTICLES; ASDEX AB The influence of the large-scale radial electric field, E(r)(0) on the frequency of shear-Alfven-type instability is analyzed. A frozen-in-flux constraint and the moderate-beta ion gyrokinetic equation are used in the derivation. The present analysis indicates that the frequency predicted by a theory without E(r)(0) effect should be Doppler shifted by k.V(E) for comparison to the experimentally observed frequency. A specific example of the practical relevance of the result is given regarding possible identification of the edge-localized-mode-associated magnetic activity recently observed in PBX-M [Plasma Physics and Controlled Nuclear Fusion Research (International Atomic Energy Agency, Vienna, 1989), Vol. 1, p. 97] tokamak experiment. RP HAHM, TS (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 19 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 2099 EP 2100 DI 10.1063/1.870606 PG 2 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600041 ER PT J AU CHARLTON, M EADES, J HORVATH, D HUGHES, RJ ZIMMERMANN, C AF CHARLTON, M EADES, J HORVATH, D HUGHES, RJ ZIMMERMANN, C TI ANTIHYDROGEN PHYSICS SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID ANTIPROTONIC HELIUM-ATOMS; EQUIVALENCE PRINCIPLE; RYDBERG CONSTANT; SLOW POSITRONS; RADIATIVE RECOMBINATION; FREQUENCY-MEASUREMENT; 1S-2S TRANSITION; QUANTUM-GRAVITY; HYDROGEN-ATOM; MAGNETIC TRAP C1 CERN,CH-1211 GENEVA,SWITZERLAND. RES INST PARTICLE & NUCL PHYS,H-1525 BUDAPEST,HUNGARY. INFN,I-56010 PISA,ITALY. MAX PLANCK INST QUANTUM OPT,GARCHING,GERMANY. LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. RP CHARLTON, M (reprint author), UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND. RI Horvath, Dezso/A-4009-2011; Zimmermann, Claus/E-9598-2014 NR 229 TC 150 Z9 150 U1 5 U2 14 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 1994 VL 241 IS 2 BP 65 EP 117 DI 10.1016/0370-1573(94)90081-7 PG 53 WC Physics, Multidisciplinary SC Physics GA NV630 UT WOS:A1994NV63000001 ER PT J AU LAROCHE, J HENRY, D WYMAN, K SUKENIK, A FALKOWSKI, P AF LAROCHE, J HENRY, D WYMAN, K SUKENIK, A FALKOWSKI, P TI CLONING AND NUCLEOTIDE-SEQUENCE OF A CDNA-ENCODING A MAJOR FUCOXANTHIN, CHLOROPHYLL A/C-CONTAINING PROTEIN FROM THE CHRYSOPHYTE ISOCHRYSIS-GALBANA - IMPLICATIONS FOR EVOLUTION OF THE CAB GENE FAMILY SO PLANT MOLECULAR BIOLOGY LA English DT Article DE CDNA; CAB; CHROMOPHYTE; FCP; ISOCHRYSIS GALBANA; LIGHT-HARVESTING COMPLEX ID DIATOM PHAEODACTYLUM-TRICORNUTUM; LIGHT-HARVESTING COMPLEX; BINDING-PROTEIN; PHOTOSYSTEM-II; DUNALIELLA-TERTIOLECTA; CHLAMYDOMONAS-REINHARDTII; ENDOPLASMIC-RETICULUM; SECONDARY-STRUCTURE; MARINE CHLOROPHYTE; HIGHER-PLANTS AB We investigated the primary structure of a cDNA encoding a light-harvesting protein from the marine chrysophyte Isochrysis galbana. Antibodies raised against the major fucoxanthin, chlorophyll ale-binding light-harvesting protein (FCP) of I. galbana were used to select a cDNA clone encoding one of the FCP apoproteins. The nucleic acid and deduced amino acid sequences reveal conserved regions within the first and third transmembrane spans with Chi a/b-binding proteins and with FCPs of another chromophyte. However, the amino acid identity between I. galbana FCP and other cab genes of FCPs is only ca. 30%. Phylogenetic analyses demonstrated that the FCP genes of both diatoms and chrysophytes sequenced to date are more closely related to cab genes encoding LHC I, CP 29, and CP 24 of higher plants than to cab genes encoding LHC II of chlorophytes. We propose that LHC I, CP 24 and CP 29 and FCP might have originated from a common ancestral chi binding protein and that the major LHC II of Chl a/b-containing organisms arose after the divergence between the chromophytes and the chlorophytes. C1 SUNY STONY BROOK,MARINE SCI RES CTR,STONY BROOK,NY 11794. ISRAEL OCEANOG & LIMNOL RES,IL-31080 HAIFA,ISRAEL. RP LAROCHE, J (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI LaRoche, Julie/A-1109-2010 NR 60 TC 26 Z9 30 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD JUN PY 1994 VL 25 IS 3 BP 355 EP 368 DI 10.1007/BF00043865 PG 14 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA PB081 UT WOS:A1994PB08100004 PM 8049362 ER PT J AU HU, HI BROWN, PH AF HU, HI BROWN, PH TI LOCALIZATION OF BORON IN CELL-WALLS OF SQUASH AND TOBACCO AND ITS ASSOCIATION WITH PECTIN - EVIDENCE FOR A STRUCTURAL ROLE OF BORON IN THE CELL-WALL SO PLANT PHYSIOLOGY LA English DT Article ID POLYSACCHARIDES; NUTRITION; GROWTH AB B deficiency results in a rapid inhibition of plant growth, and yet the form and function of B in plants remains unclear. In this paper we provide evidence that B is chemically localized and structurally important in the cell wall of plants. The localization and chemical fractionation of B was followed in squash plants (Curcurbita pepo L.) and cultured tobacco cells (Nicotiana tabacum) grown in B-replete or B-deficient medium. As squash plants and cultured tobacco cells became deficient, an increasingly large proportion of cellular B was found to be localized in the cell wall. Cytoplasmic B concentrations were reduced to essentially zero as plants became deficient, whereas cell wall B concentration remained at or above 10 mu g B/g cell wall dry weight in all experiments. Chemical and enzymic fractionation studies suggest that the majority of cell B is associated with pectins within the cell wall. Physical analysis of B-deficient tissue indicates that cell wall plastic extensibility is greatly reduced under B deficiency, and anatomical observations indicate that B deficiency impairs normal cell elongation in growing plant tissue. In plants in which B deficiency had inhibited all plant growth, tissues remained green and did not show any additional visible symptoms for at least 1 week with no additional B. This occurred even though cytoplasmic B had been reduced to extremely low levels (<0.2 mu g/g). This suggests that B in these species is largely associated with the cell wall and that any cytoplasmic role for B is satisfied by very low concentrations of B. The localization of B in the cell wall, its association with cell wall pectins, and the contingent effects of B on cell wall extensibility suggest that B plays a critical, although poorly defined, role in the cell wall structure of higher plants. C1 LAWRENCE LIVERMORE NATL LAB,DEPT POMOL,DAVIS,CA 95616. RI Brown, Patrick/E-4085-2012 OI Brown, Patrick/0000-0001-6857-8608 NR 30 TC 186 Z9 219 U1 0 U2 7 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD JUN PY 1994 VL 105 IS 2 BP 681 EP 689 PG 9 WC Plant Sciences SC Plant Sciences GA NR443 UT WOS:A1994NR44300028 ER PT J AU LEE, Y GAERTNER, R AF LEE, Y GAERTNER, R TI TECHNOLOGY-TRANSFER FROM UNIVERSITY TO INDUSTRY - A LARGE-SCALE EXPERIMENT WITH TECHNOLOGY DEVELOPMENT AND COMMERCIALIZATION SO POLICY STUDIES JOURNAL LA English DT Article AB The present national technology transfer policy suffers from the limited focus on structural barriers, as well as the reluctance of American business to invest in precommercial research and development. A growing consensus from the national debate suggests that policy attention be reoriented, thereby giving a greater emphasis to precommercial technology development (TD) research. This paper examines whether the nation's research-intensive universities, a reservoir of virtually unlimited scientific and technological resources, can possibly go beyond basic research and produce economically viable technology efficiently. To this end, the paper introduces key principles that help organize TD research within the research-intensive university. It also presents the results of a large-scale TD experiment being carried out by a research-intensive university under federal sponsorship. The midterm result strongly indicates that with modest financial support and some internal cultural adjustment, research-intensive universities can break through their ideological barriers and efficiently translate new scientific advances into commercially viable, cutting-edge technology. This is possible because, among other factors, the research-intensive university can build on its own comparative advantage of strong fundamental research. RP LEE, Y (reprint author), IOWA STATE UNIV SCI & TECHNOL,INST PHYS RES & TECHNOL,CTR ADV TECHNOL & DEV,AMES,IA 50011, USA. NR 29 TC 23 Z9 23 U1 1 U2 6 PU POLICY STUDIES ORGANIZATION PI URBANA PA UNIV ILLINOIS 361 LINCOLN HALL, URBANA, IL 61801 SN 0190-292X J9 POLICY STUD J JI Policy Stud. J. PD SUM PY 1994 VL 22 IS 2 BP 384 EP 399 DI 10.1111/j.1541-0072.1994.tb01476.x PG 16 WC Political Science; Public Administration SC Government & Law; Public Administration GA PN061 UT WOS:A1994PN06100015 ER PT J AU BOUILLARD, JX MILLER, AL AF BOUILLARD, JX MILLER, AL TI EXPERIMENTAL INVESTIGATIONS OF CHAOTIC HYDRODYNAMIC ATTRACTORS IN CIRCULATING FLUIDIZED-BEDS SO POWDER TECHNOLOGY LA English DT Article ID GAS-SOLID FLOW; GRANULAR-MATERIALS; PARTICLES; PIPE AB The hydrodynamic behavior of a cold experimental circulating fluidized bed (CFB) has been investigated using deterministic chaos theory. The time series of experimentally measured differential pressure fluctuations along the riser height of a CFB are analyzed. Major frequencies were identified using spectral frequency analysis. Poincare maps of the attractor were constructed and the correlation dimension measured. The hydrodynamic behavior of the CFB appears to be chaotic. The fractal correlation dimension of this chaotic attractor is found to be low, ranging from 1.5 to 1.9, for the fluidizing conditions studied. C1 W VIRGINIA UNIV,MORGANTOWN,WV 26506. RP BOUILLARD, JX (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 34 TC 36 Z9 37 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD JUN PY 1994 VL 79 IS 3 BP 211 EP 215 DI 10.1016/0032-5910(94)02818-4 PG 5 WC Engineering, Chemical SC Engineering GA NU546 UT WOS:A1994NU54600002 ER PT J AU KLARA, JM AF KLARA, JM TI MORE ON HIPPS TECHNOLOGY, ECONOMICS SO POWER ENGINEERING LA English DT Letter RP KLARA, JM (reprint author), PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0032-5961 J9 POWER ENG JI Power Eng. PD JUN PY 1994 VL 98 IS 6 BP 38 EP 39 PG 2 WC Energy & Fuels; Engineering, Multidisciplinary SC Energy & Fuels; Engineering GA NR710 UT WOS:A1994NR71000009 ER PT J AU PLUMMER, EW HANNON, JB AF PLUMMER, EW HANNON, JB TI THE SURFACES OF BERYLLIUM SO PROGRESS IN SURFACE SCIENCE LA English DT Article; Proceedings Paper CT VIth Symposium on Surface Physics CY MAY 24-28, 1993 CL CHLUM CASTLE, CZECH REPUBLIC SP ACAD SCI CZECH REPUBLIC, INST PHYS, UNION CZECH MATHEMATICIANS & PHYSICISTS, INT UNION PURE & APPL PHYS ID ELECTRONIC-STRUCTURE; METAL-SURFACES; BE(0001); DENSITY; MONOLAYERS; VIBRATIONS; NI(110); STRESS AB Beryllium is unique among metals. The isolated Be atom has a closed-shell 1s(2)2s2 configuration resulting is a weakly bound dimer. Promotion of the s-electrons into the unoccupied p-bands causes bonding in the solid, resulting in a solid with distinct properties: a high cohesive energy (3.32 eV per atom), a small lattice constant (2.29 angstrom), and a low density (1.85 gm/cm3). The reduction in coordination at the surface can have severe effects, because in this material there is always a competition between the energy required for s->p promotion and the energy gained from bonding. The static and dynamical properties of clean Be surfaces can be described in terms s->p promotion. Experimental results for the atomic structure, electronic states, and phonons at the surface of Be are compared with theoretical calculations. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP PLUMMER, EW (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 32 TC 32 Z9 32 U1 2 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD JUN-JUL PY 1994 VL 46 IS 2-3 BP 149 EP 158 DI 10.1016/0079-6816(94)90075-2 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NR692 UT WOS:A1994NR69200005 ER PT J AU STARKE, U VANHOVE, MA SOMORJAI, GA AF STARKE, U VANHOVE, MA SOMORJAI, GA TI ADSORBATE-INDUCED RELAXATIONS OF CLOSE-PACKED FCC AND HCP METAL-SURFACES SO PROGRESS IN SURFACE SCIENCE LA English DT Article; Proceedings Paper CT VIth Symposium on Surface Physics CY MAY 24-28, 1993 CL CHLUM CASTLE, CZECH REPUBLIC SP ACAD SCI CZECH REPUBLIC, INST PHYS, UNION CZECH MATHEMATICIANS & PHYSICISTS, INT UNION PURE & APPL PHYS ID ENERGY ELECTRON-DIFFRACTION; LEED STRUCTURE-ANALYSIS; EXTENDED FINE-STRUCTURE; STANDING-WAVE METHOD; X 2)-O; CRYSTALLOGRAPHIC ANALYSIS; INDUCED RECONSTRUCTION; ADSORPTION-SITE; NI(111); OXYGEN AB We review results and trends regarding the structural relaxations due to atoms and molecules adsorbed on close-packed surfaces of fcc and hcp metals. One observes primarily a buckling of the two topmost metal layers. Sometimes lateral relaxations are seen in the top layers, mostly radially away from or towards the adsorption site, and occasionally rotationally around the adsorption site. Such relaxations exhibit the local nature of the adsorbate-substrate bond and thus support a cluster-like view of surface bonding. These relaxations may play an important role in catalysis and other surface processes. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP STARKE, U (reprint author), UNIV ERLANGEN NURNBERG,LEHRSTUHL FESTKORPERPHYS,STAUDTSTR 7,D-91058 ERLANGEN,GERMANY. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 58 TC 42 Z9 42 U1 3 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD JUN-JUL PY 1994 VL 46 IS 2-3 BP 305 EP 319 DI 10.1016/0079-6816(94)90088-4 PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NR692 UT WOS:A1994NR69200018 ER PT J AU SELKOWITZ, S LASOURD, S AF SELKOWITZ, S LASOURD, S TI AMAZING GLAZING + RECENT DEVELOPMENTS IN GLAZING TECHNOLOGY SO PROGRESSIVE ARCHITECTURE LA English DT Article RP SELKOWITZ, S (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BUILDING TECHNOL PROGRAM,BERKELEY,CA 94720, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU PENTON PUBL INC PI CLEVELAND PA 1100 SUPERIOR AVE, CLEVELAND, OH 44114 SN 0033-0752 J9 PROG ARCHIT JI Progress. Archit. PD JUN PY 1994 VL 75 IS 6 BP 108 EP 111 PG 4 WC Architecture SC Architecture GA PQ266 UT WOS:A1994PQ26600014 ER PT J AU FOLTZ, MF COON, CL GARCIA, F NICHOLS, AL AF FOLTZ, MF COON, CL GARCIA, F NICHOLS, AL TI THE THERMAL-STABILITY OF THE POLYMORPHS OF HEXANITROHEXAAZAISOWURTZITANE .2. SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article ID PRESSURE AB Solid-solid phase transitions in the alpha, beta-, gamma-, and epsilon-polymorphs of 2,4,6,8,10,12-hexanitrohexaazaisowurtzitane (HNIW) have been studied as a function of temperature. Techniques employed include differential scanning calorimetry (DSC), differential thermal analysis/thermogravimetric analysis (DTA/TGA), and hot stage microscope analysis. Fourier transform infrared spectroscopy (FTIR) was used to identify results of polymorphic conversion. Results corroborate those((2)) of Part I that the existence of multiple a-hydrate phases complicates definition of the HNIW P-T phase diagram. A high temperature endothermic DSC response was determined by FTIR spectroscopy to be the beta --> gamma transition, not a conversion to a new high temperature ''delta'' phase. The role of water in the shifting this conversion to higher temperature is discussed. RP FOLTZ, MF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 14 TC 37 Z9 40 U1 0 U2 13 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD JUN PY 1994 VL 19 IS 3 BP 133 EP 144 DI 10.1002/prep.19940190305 PG 12 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA QD843 UT WOS:A1994QD84300004 ER PT J AU GERCHMAN, SE GRAZIANO, V RAMAKRISHNAN, V AF GERCHMAN, SE GRAZIANO, V RAMAKRISHNAN, V TI EXPRESSION OF CHICKEN LINKER HISTONES IN ESCHERICHIA-COLI - SOURCES OF PROBLEMS AND METHODS FOR OVERCOMING SOME OF THE DIFFICULTIES SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article ID ESCHERICHIA-COLI; CHROMATIN FIBER; GLOBULAR DOMAIN; RNA-POLYMERASE; LAC REPRESSOR; SEQUENCE; CODON; GENES; DNA; ACCESSIBILITY AB Expression of histones in Escherichia coli is important in structural studies on chromatin, because it allows isotopic labeling such as deuteration and replacement of methionines with selenomethionine as well as expression of specific domains of histones. We show that full-length H5 cannot be expressed in E. coli. We have determined that the problem is translational rather than transcriptional. Pulse-labeling studies show that protein turnover is not the reason for lack of accumulation. On dissecting the gene, we find that the problem lies in expressing the highly charged C-terminal tail of H5. We can make progressively increasing amounts of the tail, but at the point where over two-thirds of this region is transcribed, the protein ceases to be made. Surprisingly, full-length H1 is made. In vitro studies show that the H5 gene can be translated in a rabbit reticulocyte system but not in an E. coli system, suggesting that there may be a difference in the ability of eukaryotic and prokaryotic ribosomes to translate this message. The expression of the globular domains of H5 and H1 posed a different problem. There was little or no expression of some of the constructs, even though they were fragments of larger constructs that were well made. Replacement of the first five codons downstream of the initiating ATG codon with those optimized for E. coli, and which were AT rich, restored expression. This may have general implications for expression of eukaryotic proteins in E. coli. (C) 1994 Academic Press, Inc. RP GERCHMAN, SE (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. FU NIGMS NIH HHS [GM42796] NR 29 TC 65 Z9 65 U1 1 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1046-5928 J9 PROTEIN EXPRES PURIF JI Protein Expr. Purif. PD JUN PY 1994 VL 5 IS 3 BP 242 EP 251 DI 10.1006/prep.1994.1037 PG 10 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA NP051 UT WOS:A1994NP05100005 PM 7950367 ER PT J AU BECKMAN, DA SOLOMON, HM BUCK, SJ GORSON, RO MILLS, RE BRENT, RL AF BECKMAN, DA SOLOMON, HM BUCK, SJ GORSON, RO MILLS, RE BRENT, RL TI EFFECTS OF DOSE AND DOSE PROTECTION ON EMBRYOTOXICITY OF 14.1 MEV NEUTRON-IRRADIATION IN RATS SO RADIATION RESEARCH LA English DT Article ID FISSION-SPECTRUM NEUTRONS; MOUSE EMBRYOS; X-RAYS; FETAL EXPOSURE; MICE; ZYGOTES; BRAIN AB The embryotoxic effects of neutron radiation on rodent embryos are documented, but there is disagreement about the dose-response relationship and the impact of protracting the dose. Pregnant rats were exposed to total absorbed doses of 0.15 to 1.50 Gy 14.1 MeV neutrons on day 9.5 after conception, coincident with the most sensitive stage of embryonic development for the induction of major congenital malformations. In general terms, the incidence of embryotoxic effects increased with increasing total absorbed dose. However, the dose-response relationship differed depending on the parameter of embryotoxicity chosen, namely, intrauterine death, malformations or very low body weight. In a second study, embryos were exposed to a single embryotoxic absorbed dose (0.75 Gy) administered at a range of dose rates, from 0.10 to 0.50 Gy/h. The results offer no evidence that protraction of this selected dose significantly increased or decreased the incidence or pattern of embryotoxicity of the neutron exposure used in this study. The results do not support the hypothesis of a linear dose-response relationship for the effects of prenatal neutron irradiation that contribute to embryotoxicity for total absorbed doses of 0.15 to 1.50 Gy. C1 THOMAS JEFFERSON UNIV,JEFFERSON MED COLL,DEPT PEDIAT,PHILADELPHIA,PA 19107. SMITHKLINE BEECHAM PHARMACEUT,DIV RES & DEV,KING OF PRUSSIA,PA 19406. THOMAS JEFFERSON UNIV,JEFFERSON MED COLL,DEPT RADIOL,PHILADELPHIA,PA 19107. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BECKMAN, DA (reprint author), ALFRED I DUPONT INST,DEPT MED CELL BIOL,POB 269,WILMINGTON,DE 19899, USA. FU NCI NIH HHS [CA29628]; NICHD NIH HHS [HD18167, HD07075] NR 23 TC 6 Z9 6 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1994 VL 138 IS 3 BP 337 EP 342 DI 10.2307/3578681 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA NP025 UT WOS:A1994NP02500005 PM 8184007 ER PT J AU GOODWIN, EH BLAKELY, EA TOBIAS, CA AF GOODWIN, EH BLAKELY, EA TOBIAS, CA TI CHROMOSOMAL DAMAGE AND REPAIR IN G(1)-PHASE CHINESE-HAMSTER OVARY CELLS EXPOSED TO CHARGED-PARTICLE BEAMS SO RADIATION RESEARCH LA English DT Article ID HUMAN INTERPHASE CHROMOSOMES; X-RAY; MAMMALIAN-CELLS; ALPHA-PARTICLES; CONDENSATION; IRRADIATION; INACTIVATION; ABERRATIONS; LYMPHOCYTES; CHROMATIN AB Chromosomal fragmentation was examined in G(1)-phase Chinese hamster ovary cells using the premature chromosome condensation (PCC) technique. The yield and distribution of chromatin breaks, the lesions revealed by PCC, were measured in cells exposed to X rays or each of nine particle beams covering a range of LET from 0.56 to 2700 keV/mu m. The average number of breaks per cell was found to be linearly proportional to the fluence of high-LET neon ions (183 keV/mu m). Assuming a linear response for the other beams, the level of breakage per unit dose rose from a plateau at the lowest LET values to a peak in the 100-200 keV/mu m range and then declined continuously thereafter, eventually falling well below the low-LET plateau. The maximum breakage RBE was 1.5. The average number of breaks per particle traversal rose steadily from 0.006 to 11 breaks/cell as the LET increased from 0.56 to 2700 keV/mu m. The breaks were distributed randomly within the cell population after low-LET irradiation, but became progressively overdispersed with increasing LET. Rejoining of prematurely condensed chromosomes plus fragments was followed for up to 5 h for four particle beams having LET values between 0.56 and 183 keV/mu m. An LET-dependent trend toward higher levels of residual fragments was observed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. FU NCI NIH HHS [2-T32-CA09272-06, CA-15184] NR 34 TC 51 Z9 58 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JUN PY 1994 VL 138 IS 3 BP 343 EP 351 DI 10.2307/3578682 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA NP025 UT WOS:A1994NP02500006 PM 8184008 ER PT J AU HALLAHAN, DE BLEAKMAN, D VIRUDACHALAM, S LEE, D GRDINA, D KUFE, DW WEICHSELBAUM, RR AF HALLAHAN, DE BLEAKMAN, D VIRUDACHALAM, S LEE, D GRDINA, D KUFE, DW WEICHSELBAUM, RR TI THE ROLE OF INTRACELLULAR CALCIUM IN THE CELLULAR-RESPONSE TO IONIZING-RADIATION SO RADIATION RESEARCH LA English DT Article ID PROTEIN-KINASE-C; CYCLE PROGRESSION; HUMAN-FIBROBLASTS; DNA-REPLICATION; X-IRRADIATION; JUN; EXPRESSION; ACTIVATION; CELLS; MODULATION AB Calcium is required as a cofactor by primer recognition proteins involved in DNA synthesis and by protein kinase C (PKC), which is activated by ionizing radiation. Because these processes may be involved in radiation-mediated regulation of the progression of cells through the phases of the cell cycle, we studied the effects of the intracellular Ca2+ chelator, acetoxymethyl-1,2-bis(2-aminophenoxy)ethane-N,N,N'N'-tetraacetic acid (AM-BAPTA), on PKC activation, expression of c-jun and Gadd45 and distribution of cells in the phases of the cell cycle after irradiation. AM-BAPTA prevented ionizing-radiation-induced activation of PKC and expression of c-jun in cells of human tumor cell lines. Conversely, calcium chelation had no effect on X-ray-induced expression of the Gadd45 gene. To determine whether changes in the intracellular Ca2+ concentration ([Ca2+](i)) occurred during irradiation, we measured [Ca2+](i) in single cells using fura-2-based microfluorimetry. There was no increase in [Ca2+](i) during or after irradiation of cells of the human tumor cell lines RIT-3, SQ-20B or HL-60 or normal human fibroblast strain IMR-90. The percentage of human tumor cells crossing the G(1)/S-phase border was reduced by pretreatment with AM-BAPTA. These data indicate that calcium is required for ionizing radiation-induced cell cycle regulation and PKC activation, but that increases in [Ca2+](i) do not occur in cells of the cell lines irradiated in this study. C1 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHARMACOL & PHYSIOL SCI,CHICAGO,IL 60637. PRITZKER SCH MED,CHICAGO,IL 60637. ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. DANA FABER CANC INST,CLIN PHARMACOL LAB,BOSTON,MA 02115. FU NCI NIH HHS [NCI CA41068, NCI CA37435, NCI CA58508] NR 46 TC 32 Z9 33 U1 0 U2 3 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 1994 VL 138 IS 3 BP 392 EP 400 DI 10.2307/3578688 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA NP025 UT WOS:A1994NP02500012 PM 8184014 ER PT J AU PEILERT, G STOCKER, H GREINER, W AF PEILERT, G STOCKER, H GREINER, W TI PHYSICS OF HIGH-ENERGY HEAVY-ION COLLISIONS SO REPORTS ON PROGRESS IN PHYSICS LA English DT Review ID RELATIVISTIC NUCLEAR COLLISIONS; MEAN-FIELD-THEORY; QUANTUM MOLECULAR-DYNAMICS; MASS FRAGMENT EMISSION; MANY-BODY MODEL; E/A = 35; POTENTIAL INTERNUCLEON INTERACTION; INTRANUCLEAR CASCADE CALCULATION; SUBTHRESHOLD PION-PRODUCTION; UEHLING-UHLENBECK THEORY AB This is a review of the present status of heavy-ion collisions at intermediate energies. The main goal of heavy-ion physics in this energy regime is to shed some light on the nuclear equation of state (EOS), hence we present the basic concept of the EOS in nuclear matter as well as of nuclear shock waves which provide the key mechanism for the compression of nuclear matter. The main part of this article is devoted to the models currently used for describing heavy-ion reactions theoretically and to the observables useful for extracting information about the EOS from experiments. A detailed discussion of the flow effects with a broad comparison with the available data is presented. The many-body aspects of such reactions are investigated via the multifragmentation break up of excited nuclear systems and a comparison of model calculations with the most recent multifragmentation experiments is presented. C1 JW GOETHE UNIV,INST THEORET PHYS,D-60054 FRANKFURT,GERMANY. RP PEILERT, G (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 249 TC 56 Z9 56 U1 1 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0034-4885 J9 REP PROG PHYS JI Rep. Prog. Phys. PD JUN PY 1994 VL 57 IS 6 BP 533 EP 602 DI 10.1088/0034-4885/57/6/001 PG 70 WC Physics, Multidisciplinary SC Physics GA NT827 UT WOS:A1994NT82700001 ER PT J AU MUSGRAVE, JA CAREY, RG JANECKY, DR TAIT, CD AF MUSGRAVE, JA CAREY, RG JANECKY, DR TAIT, CD TI ADAPTION OF SYNCHRONOUSLY SCANNED LUMINESCENCE SPECTROSCOPY TO ORGANIC-RICH FLUID INCLUSION MICROANALYSIS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID AUTOMOBILE ENGINE OILS; GUAYMAS BASIN; EVIDENTIAL VALUE; FLUORESCENCE SPECTROSCOPY; HYDROTHERMAL PETROLEUM; SPREADING CENTER; CALIFORNIA; EXCITATION; SEDIMENTS; GULF AB The instrumentation, the luminescence microprobe, and synchronously scanned luminescence spectroscopy technique described here can be used to classify microliter quantities of oil such as those in fluid inclusions in cements from petroleum reservoirs. It is primarily constructed to obtain synchronously scanned luminescence spectra from microscopic sized samples to characterize the organic classes of compounds that predominate. At present no other technique can so readily analyze a single oil-bearing fluid inclusion. The data collected from the technique are pertinent to evaluating systems and providing quantitative data for solving problems in oil migration and maturation determinations, oil-to-oil and oil-to-source correlations, oil degradation, and episodes and chemistry of cementation. C1 SCI INSTRUMENT CO,TEMPE,AZ 85282. LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. RP MUSGRAVE, JA (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,MAIL STOP J514,LOS ALAMOS,NM 87545, USA. NR 39 TC 6 Z9 6 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1994 VL 65 IS 6 BP 1877 EP 1882 DI 10.1063/1.1144836 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NU854 UT WOS:A1994NU85400007 ER PT J AU FEHL, DL LEEPER, RJ LEE, JR HEDEMANN, MA STYGAR, WA SUJKA, BR HEBRON, DE ROBISCHON, SJ PEYTON, BP AF FEHL, DL LEEPER, RJ LEE, JR HEDEMANN, MA STYGAR, WA SUJKA, BR HEBRON, DE ROBISCHON, SJ PEYTON, BP TI A ONE-DIMENSIONAL TIME-RESOLVED PINHOLE CAMERA FOR INTENSE PULSED BREMSSTRAHLUNG SOURCES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A time-resolved pinhole camera has been constructed to diagnose flash x-ray bremsstrahlung sources with end-point energies of approximately 2 MeV The detector is a 20-channel linear array of noncontinguous plastic scintillators with a sampling distance of 6.4 mm. Optical signals from the scintillators are conducted by fiber-optic links to a remote bank of photomultiplier tubes. Nominally, the absolute sensitivity of the channels is approximately 18 nC/R at 1.1 MeV. The temporal resolution is approximately 5 ns, and the spatial resolution in the source plane is approximately 38 mm for a 3-mm pinhole and magnification of 1/3. The spectral response of the scintillator channels, the relative channel-to-channel sensitivities, cross talk between channels, backgrounds, and noise limitations have also been studied. Experiments with this camera on the Saturn simulator have yielded information on the simultaneity and duration of the x-ray emission from individual source rings. This camera complements time-integrated and time-gated cameras, as well as spatially integrated, but time-resolved, PIN diode and scintillator/photodiode detectors. C1 KTECH CORP INC,ALBUQUERQUE,NM 87110. RP FEHL, DL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 34 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 1994 VL 65 IS 6 BP 1935 EP 1948 DI 10.1063/1.1144845 PG 14 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NU854 UT WOS:A1994NU85400017 ER PT J AU ALTON, GD MILLS, GD DELLWO, J AF ALTON, GD MILLS, GD DELLWO, J TI DESIGN-FEATURES OF A HIGH-INTENSITY, CESIUM-SPUTTER PLASMA-SPUTTER NEGATIVE-ION SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A versatile, high-intensity, negative ion source has been designed and is now under construction which can be operated in either the cesium-sputter or plasma-sputter mode. The cesium-sputter mode can be effected by installation of a newly designed conical-geometry cesium-surface ionizer; for operation in the plasma-sputter mode, the surface ionizer is removed and either a bot filament or rf antenna plasma-discharge igniter is installed. A multicusp magnetic field is specifically provided confining the plasma in the radial direction when the plasma-sputter mode is selected. This arrangement allows comparison of the two modes of operation. Brief descriptions of the design features, ion optics, and anticipated performances of the two source geometries will be presented in this report. C1 JOINT INST HEAVY ION RES,OAK RIDGE,TN. RP ALTON, GD (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 24 TC 8 Z9 8 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1994 VL 65 IS 6 BP 2006 EP 2011 DI 10.1063/1.1144804 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NU854 UT WOS:A1994NU85400029 ER PT J AU ALTON, GD HAYNES, DL MILLS, GD OLSEN, DK AF ALTON, GD HAYNES, DL MILLS, GD OLSEN, DK TI SELECTION AND DESIGN OF ION SOURCES FOR USE AT THE HOLIFIELD RADIOACTIVE ION-BEAM FACILITY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ISOTOPE-SEPARATION; SURFACE-IONIZATION; INTENSE BEAMS; ONLINE; ACCELERATORS; RELEASE; GSI AB The Holifield Radioactive Ion Beam Facility now under construction at the Oak Ridge National Laboratory will use the 25 MV tandem accelerator for the acceleration of radioactive ion beams to energies appropriate for research in nuclear physics; negative ion beams are, therefore, required for injection into the tandem accelerator. Because charge exchange is an efficient means for converting initially positive ion beams to negative ion beams, both positive and negative ion sources are viable options for use at the facility. The choice of the type of ion source will depend on the overall efficiency for generating the radioactive species of interest. Although direct-extraction negative ion sources are clearly desirable, the ion formation efficiencies are often too low for practical consideration; for this situation, positive ion sources, in combination with charge exchange, are the logical choice. The high-temperature version of the CERN-ISOLDE positive ion source has been selected and a modified version of the source designed and fabricated for initial use at the facility because of its low emittance, relatively high ionization efficiencies, and species versatility, and because it has been engineered for remote installation, removal, and servicing as required for safe handling in a high-radiation-level ISOL facility. The source will be primarily used to generate ion beams from elements with intermediate to low electron affinities. Prototype plasma-sputter negative ion sources and negative surface-ionization sources are under design consideration for generating radioactive ion beams from high-electron-affinity elements. The design features of these sources and expected efficiencies and beam qualities (emittances) will be described in this report. RP ALTON, GD (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 24 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 1994 VL 65 IS 6 BP 2012 EP 2018 DI 10.1063/1.1144805 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NU854 UT WOS:A1994NU85400030 ER PT J AU SARRAO, JL CHEN, SR VISSCHER, WM LEI, M KOCKS, UF MIGLIORI, A AF SARRAO, JL CHEN, SR VISSCHER, WM LEI, M KOCKS, UF MIGLIORI, A TI DETERMINATION OF THE CRYSTALLOGRAPHIC ORIENTATION OF A SINGLE-CRYSTAL USING RESONANT ULTRASOUND SPECTROSCOPY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note ID SOLIDS AB Using resonant ultrasound spectroscopy (RUS) we have determined the crystallographic orientation of a tantalum single crystal from a measurement of its mechanical resonance spectrum. This accomplishment is significant not only because it reduces the sample requirements for RUS but also because it is the simplest method for simultaneous determination of a crystal's elastic constants and microscopic crystallographic orientation. RP SARRAO, JL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI CHEN, Jiangang/A-1549-2011; Kocks, Fred/E-1159-2011 NR 15 TC 14 Z9 14 U1 1 U2 10 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 1994 VL 65 IS 6 BP 2139 EP 2140 DI 10.1063/1.1144712 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NU854 UT WOS:A1994NU85400054 ER PT J AU BARNTHOUSE, LW AF BARNTHOUSE, LW TI ISSUES IN ECOLOGICAL RISK ASSESSMENT - THE CRAM PERSPECTIVE SO RISK ANALYSIS LA English DT Article; Proceedings Paper CT Conference on the Risk Assessment Paradigm After Ten Years: Policy and Practice Then, Now, and in the Future CY APR 05-08, 1993 CL WRIGHT PATTERSON AFB, OH SP USAF, ARMSTRONG LAB, TOXICOL DIV, USN, NAVAL MED RES INST DETACHMENT, USA, ARMY BIOMED RES & DEV LAB, US EPA, ENVIRONM CRITERIA & ASSESSMENT OFF, NATL RES COUNCIL, COMM TOXICOL DE ECOLOGY; RISK ASSESSMENT; RISK MANAGEMENT AB In 1989, a Committee on Risk Assessment Methodology (CRAM) was convened by the National Research Council (NRC) to identify and investigate important scientific issues in risk assessment. One of the first issues considered by the committee was the development of a conceptual framework for ecological risk assessment, defined as ''the characterization of the adverse ecological effects of environmental exposures to hazards imposed by human activities.'' Adverse ecological effects include all biological and nonbiological environmental changes that society perceives as undesirable. The committee's opinion was that a general framework is needed to define the relationship of ecological risk assessment to environmental management and to facilitate the development of uniform technical guidelines. The framework for human health risk assessment proposed by the NRC in 1983 was adopted as a starting point for discussion. CRAM concluded that, although ecological risk assessment and human health risk assessment differ substantially in terms of scientific disciplines and technical problems, the underlying decision process is the same for both. Therefore, CRAM recommended that the 1983 risk assessment framework be modified to accommodate both human health and ecological risk assessment. CRAM defined an integrated health/ecological risk assessment framework consisting of the four components: Hazard Identification, Exposure Assessment, Exposure-Response Assessment, and Risk Characterization. CRAM further provided recommendations on the scope of issues to be addressed in ecological risk assessment, critical research needs, and mechanisms for providing more detailed guidance on the scientific content of ecological risk assessments. RP BARNTHOUSE, LW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,BOX 2008,OAK RIDGE,TN 37831, USA. NR 8 TC 7 Z9 7 U1 0 U2 5 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 1994 VL 14 IS 3 BP 251 EP 256 DI 10.1111/j.1539-6924.1994.tb00239.x PG 6 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA NR536 UT WOS:A1994NR53600005 PM 8029496 ER PT J AU BRADBURY, JA AF BRADBURY, JA TI RISK COMMUNICATION IN ENVIRONMENTAL RESTORATION PROGRAMS SO RISK ANALYSIS LA English DT Article; Proceedings Paper CT Conference on the Risk Assessment Paradigm After Ten Years: Policy and Practice Then, Now, and in the Future CY APR 05-08, 1993 CL WRIGHT PATTERSON AFB, OH SP USAF, ARMSTRONG LAB, TOXICOL DIV, USN, NAVAL MED RES INST DETACHMENT, USA, ARMY BIOMED RES & DEV LAB, US EPA, ENVIRONM CRITERIA & ASSESSMENT OFF, NATL RES COUNCIL, COMM TOXICOL DE RISK COMMUNICATION; ENVIRONMENTAL REMEDIATION; PUBLIC PARTICIPATION; COMMUNICATION MODELS ID POLICY IMPLICATIONS AB The author advocates adoption of a convergence model in place of the traditional source-receiver model of communication for communicating with members of the public who have a stake in remediation of a nearby site. The source-receiver model conceives of communication as the transmission of a message from a risk management agency (sender) to a target audience of the public (receivers). The underlying theme is that the sender intends to change the perception of the receiver of either the issue or the sender of information. The author draws on her experience at a Department of Energy (DoE) site undergoing remediation to illustrate why the convergence model is more appropriate in the context of cleanup. This alternative model focuses on the Latin derivation of communication as sharing or making common to many (i.e., as involving a relationship between participants who engage in a process of communication). The focus appears to be consistent with recently issued DoE policy that calls for involving the public in identifying issues and problems and in formulating and evaluating decision alternatives in cleanup. By emphasizing context, process, and participants, as opposed to senders and receivers, the model identifies key issues to address in facilitating consensus concerning the risks of cleanup. Similarities between the institutional context of DoE and Department of Defense (DoD) suggest that a convergence model may also prove to be an appropriate conceptual foundation for risk communication at contaminated DoD sites. RP BRADBURY, JA (reprint author), PACIFIC NW LAB, WASHINGTON OPERAT, SUITE 900,901 D ST SW, WASHINGTON, DC 20024 USA. NR 23 TC 14 Z9 14 U1 0 U2 5 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 1994 VL 14 IS 3 BP 357 EP 363 DI 10.1111/j.1539-6924.1994.tb00252.x PG 7 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA NR536 UT WOS:A1994NR53600018 ER PT J AU BRIMHALL, JL COLE, JI BRUEMMER, SM AF BRIMHALL, JL COLE, JI BRUEMMER, SM TI DEFORMATION MICROSTRUCTURES IN ION-IRRADIATED STAINLESS-STEEL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP BRIMHALL, JL (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. OI Cole, James/0000-0003-1178-5846 NR 13 TC 7 Z9 7 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 1 PY 1994 VL 30 IS 11 BP 1473 EP 1478 DI 10.1016/0956-716X(94)90248-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NC656 UT WOS:A1994NC65600020 ER PT J AU TONN, BE AF TONN, BE TI USING THE NATIONAL INFORMATION INFRASTRUCTURE FOR SOCIAL-SCIENCE, EDUCATION, AND INFORMED DECISION-MAKING SO SOCIAL SCIENCE COMPUTER REVIEW LA English DT Article AB The United States has aggressively embarked on the challenging task of building a National Information Infrastructure (NII). This infrastructure will have many levels, extending from the building-block capital stock that composes the telecommunications system to the multitude of higher tier applications hardware and software tied to this system. This ''white paper'' presents a vision for a second- and third-tier national information infrastructure that focuses exclusively on the needs of social science, education, and decision making (NII-SSEDM). NII-SSEDM will provide the necessary data, information, and automated decision support and educational tools needed to help this nation solve its most pressing social problems. The proposed system has five components: data collection systems; databases; statistical analysis and modeling tools; policy analysis and decision support tools; and materials and software specially designed for education. This paper contains: a vision statement for each component; comments on progress made on each component as of the early 1990s; and specific recommendations on how to achieve the goals described in the vision statements. The white paper also discusses how the NII-SSEDM could be used to address four major social concerns: insuring economic prosperity; health care; reducing crime and violence; and K-12 education. Examples of near-term and midterm goals (e.g., pre- and post-year 2000) are presented for consideration. Although the development of NII-SSEDM Will require a concerted effort by government, the private sector, schools, and numerous other organizations, the success of NII-SSEDM is predicated upon the identification of an institutional ''champion'' to acquire and husband key resources and provide strong leadership and guidance. RP TONN, BE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 2 Z9 2 U1 1 U2 2 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0894-4393 J9 SOC SCI COMPUT REV JI Soc. Sci. Comput. Rev. PD SUM PY 1994 VL 12 IS 2 BP 166 EP 182 DI 10.1177/089443939401200202 PG 17 WC Computer Science, Interdisciplinary Applications; Information Science & Library Science; Social Sciences, Interdisciplinary SC Computer Science; Information Science & Library Science; Social Sciences - Other Topics GA NN066 UT WOS:A1994NN06600002 ER PT J AU STEVENS, SS TONN, BE SOUTHWORTH, F AF STEVENS, SS TONN, BE SOUTHWORTH, F TI A STUDY OF THE POTENTIAL FOR COOPERATION BETWEEN MODELS AND MODELERS SO SOCIAL SCIENCE COMPUTER REVIEW LA English DT Article DE MODELING; SIMULATION; COMPUTING; OAK-RIDGE-NATIONAL-LABORATORY; COLLABORATIVE WORK AB Modeling is discussed with reference to applications undertaken by the Oak Ridge National Laboratory. Topics treated include strategies for linking models, software tools and techniques, and problems and opportunities arising from collaborative modeling. RP STEVENS, SS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0894-4393 J9 SOC SCI COMPUT REV JI Soc. Sci. Comput. Rev. PD SUM PY 1994 VL 12 IS 2 BP 231 EP 241 DI 10.1177/089443939401200207 PG 11 WC Computer Science, Interdisciplinary Applications; Information Science & Library Science; Social Sciences, Interdisciplinary SC Computer Science; Information Science & Library Science; Social Sciences - Other Topics GA NN066 UT WOS:A1994NN06600007 ER PT J AU MUIR, JF HOGAN, RE SKOCYPEC, RD BUCK, R AF MUIR, JF HOGAN, RE SKOCYPEC, RD BUCK, R TI SOLAR REFORMING OF METHANE IN A DIRECT ABSORPTION CATALYTIC REACTOR ON A PARABOLIC DISH .1. TEST AND ANALYSIS SO SOLAR ENERGY LA English DT Article ID CHEMICAL REACTORS; RECEIVER REACTOR; HAZARDOUS WASTES; DESTRUCTION; ENERGY AB The concept of solar driven chemical reactions in a commercial-scale volumetric receiver/reactor on a parabolic concentrator was successfully demonstrated in the CAtalytically Enhanced Solar Absorption Receiver (CAESAR) test. Solar reforming of methane (CH4) with carbon dioxide (CO2) was achieved in a 64 cm diameter direct absorption reactor on a parabolic dish capable of 150 kW solar power. The reactor was a catalytic volumetric absorber consisting of a multilayered, porous alumina foam disk coated with rhodium (Rh) catalyst. The system was operated during both steady-state and solar transient (cloud passage) conditions. The total solar power absorbed reached values up to 97 kW and the maximum methane conversion was 70%. Receiver thermal efficiencies ranged up to 85% and chemical efficiencies peaked at 54%. The absorber performed satisfactorily in promoting the reforming reaction during the tests without carbon formation. However, problems of cracking and degradation of the porous matrix, nonuniform dispersion of the Rh through the absorber, and catalyst deactivation due to sintering and possible encapsulation, must be resolved to achieve long-tem operation and eventual commercialization. C1 DLR ITT,STUTTGART,GERMANY. RP MUIR, JF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 57 Z9 60 U1 0 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-092X J9 SOL ENERGY JI Sol. Energy PD JUN PY 1994 VL 52 IS 6 BP 467 EP 477 DI 10.1016/0038-092X(94)90654-8 PG 11 WC Energy & Fuels SC Energy & Fuels GA NM891 UT WOS:A1994NM89100002 ER PT J AU SKOCYPEC, RD HOGAN, RE MUIR, JF AF SKOCYPEC, RD HOGAN, RE MUIR, JF TI SOLAR REFORMING OF METHANE IN A DIRECT ABSORPTION CATALYTIC REACTOR ON A PARABOLIC DISH .2. MODELING AND ANALYSIS SO SOLAR ENERGY LA English DT Article ID CHEMICAL REACTORS AB The CAtalytically Enhanced Solar Absorption Receiver (CAESAR) test was conducted to determine the thermal, chemical, and mechanical performance of a commercial-scale, dish-mounted, direct catalytic absorption receiver (DCAR) reactor over a range of steady state and transient (cloud) operating conditions. The focus of the test was to demonstrate ''proof-of-concept'' and determine global performance such as reactor efficiencies and overall methane conversion. A numerical model was previously developed to provide guidance in the design of the absorber. The one-dimensional, planar, and steady-state model incorporates the following energy transfer mechanisms: solar and infrared radiation, heterogeneous chemical reaction, conduction in the solid phase, and convection between the fluid and solid phases. Improvements to the model and improved property values are presented here. In particular, the solar radiative transfer model is improved by using a three-flux technique to more accurately represent the typically conical incident flux. A spatially varying catalyst loading is incorporated, convective and radiative properties for each layer in the multilayer absorber are determined, and more realistic boundary conditions are applied. Considering that this test was not intended to provide data for code validation, model predictions are shown to generally bound the test axial thermocouple data when test uncertainties are included. Global predictions are made using a technique in which the incident solar flux distribution is subdivided into flux contour bands. Reactor predictions for anticipated operating conditions suggested that a further in optical density (i.e., extinction coefficient) at the front of the absorber inner disk may improve absorber conditions. Code-validation experiments are needed to improve the confidence in the simulation of large-scale reactor operation. RP SKOCYPEC, RD (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 23 Z9 24 U1 2 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-092X J9 SOL ENERGY JI Sol. Energy PD JUN PY 1994 VL 52 IS 6 BP 479 EP 490 DI 10.1016/0038-092X(94)90655-6 PG 12 WC Energy & Fuels SC Energy & Fuels GA NM891 UT WOS:A1994NM89100003 ER PT J AU JENKINS, P LANDIS, GA FATEMI, NS SCHEIMAN, D LI, XN BAILEY, SG AF JENKINS, P LANDIS, GA FATEMI, NS SCHEIMAN, D LI, XN BAILEY, SG TI AN INP SOLAR-CELL WITH A LIGHT-TRAPPING FRONT SURFACE SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Low-angle (311) V-grooves can be produced on a (100) InP surface by a maskless anisotropic etch. This can reduce the surface reflectivity of a glass-covered InP solar cell. Light reflected from grooved surface is trapped by total internal reflection at the glass/air interface and directed back to the solar cell. Results from ITO/InP solar cells on low-angle V-grooved substrates are presented, showing a 5.8% increase in short-circuit current, and a nearly equal rise in efficiency. C1 SVERDRUP TECHNOL INC, LEWIS RES CTR GRP, 21000 BROOKPARK RD, CLEVELAND, OH 44135 USA. NREL, GOLDEN, CO 80401 USA. NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. NR 16 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 EI 1879-3398 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1994 VL 33 IS 2 BP 125 EP 133 DI 10.1016/0927-0248(94)90201-1 PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA PA165 UT WOS:A1994PA16500002 ER PT J AU SCHISSEL, P JORGENSEN, G KENNEDY, C GOGGIN, R AF SCHISSEL, P JORGENSEN, G KENNEDY, C GOGGIN, R TI SILVERED-PMMA REFLECTORS SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB Metallized, flexible polymeric reflector materials are much lighter and potentially less expensive than the conventional glass/metal mirrors often used in solar thermal concentrators such as heliostats and parabolic dishes and troughs. Unweathered silvered-PMMA reflectors have a solar reflectance at least as high as glass reflectors, but their environmental durability needs to be demonstrated. ECP-305, a silvered-PMMA film available commercially from the 3M Company and developed in collaboration with the National Renewable Energy Laboratory, is the current state of the art. Important progress has been made in overcoming the three primary mechanisms causing ECP-305 to lose reflectance. These mechanisms are: (1) photon-induced silver corrosion, (2) surface soiling, and (3) a form of delamination called tunnelling. Given the progress in resolving these performance lifetime issues, silvered-PMMA films should meet the reflectance and durability goals. C1 NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401. NR 9 TC 21 Z9 21 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JUN PY 1994 VL 33 IS 2 BP 183 EP 197 DI 10.1016/0927-0248(94)90207-0 PG 15 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA PA165 UT WOS:A1994PA16500008 ER PT J AU GRAHAM, TB AF GRAHAM, TB TI PREDATION BY DIPTERAN LARVAE ON FAIRY SHRIMP (CRUSTACEA, ANOSTRACA) IN UTAH ROCK-POOLS SO SOUTHWESTERN NATURALIST LA English DT Note RP GRAHAM, TB (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM STUDIES,NATL BIOL SURVEY,DAVIS,CA 95616, USA. NR 0 TC 4 Z9 4 U1 1 U2 3 PU SOUTHWESTERN ASSN NATURALISTS PI SAN MARCOS PA SOUTHWEST TEXAS STATE UNIV, DEPT BIOLOGY, 601 UNIVERSITY DR, SAN MARCOS, TX 78666 SN 0038-4909 J9 SOUTHWEST NAT JI Southw. Natural. PD JUN PY 1994 VL 39 IS 2 BP 206 EP 207 DI 10.2307/3672253 PG 2 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA NU893 UT WOS:A1994NU89300021 ER PT J AU BARBIERI, A JENTZ, D MATERER, N HELD, G DUNPHY, J OGLETREE, DF SAUTET, P SALMERON, M VANHOVE, MA SOMORJAI, GA AF BARBIERI, A JENTZ, D MATERER, N HELD, G DUNPHY, J OGLETREE, DF SAUTET, P SALMERON, M VANHOVE, MA SOMORJAI, GA TI SURFACE CRYSTALLOGRAPHY OF RE(0001)-(2X2)-S AND RE(0001)-(2-ROOT-3X2-ROOT) R30-DEGREES-6S - A COMBINED LEED AND STM STUDY SO SURFACE SCIENCE LA English DT Article ID SCANNING TUNNELING MICROSCOPE; ENERGY ELECTRON-DIFFRACTION; TENSOR LEED; SULFUR; ADSORPTION; OVERLAYER; ATOM AB We analyze two structures formed by sulfur adsorbed on Re(0001) by using a combination of LEED and STM techniques. At low coverage (0.25 ML) sulfur atoms adsorb in three-fold hcp hollow sites forming a (2 x 2) structure. At higher coverages (0.5 ML) sulfur adsorbs close to three-fold hcp hollow sites and forms distorted hexamers arranged in a (2 square-root 3 x 2 square-root 3)R30-degrees pattern. A complete structural determination was performed by using automated Tensor LEED, aided by STM, showing substantial substrate relaxations that become more pronounced with increasing sulfur coverage. The sulfur height above the first rhenium layer in the case of the (2 x 2) structure agrees well with that determined by a quantitative theoretical analysis of the STM images. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Van Hove, Michel/A-9862-2008; Held, Georg/D-5468-2013; Sautet, Philippe/G-3710-2014; Ogletree, D Frank/D-9833-2016 OI Van Hove, Michel/0000-0002-8898-6921; Sautet, Philippe/0000-0002-8444-3348; Ogletree, D Frank/0000-0002-8159-0182 NR 32 TC 25 Z9 25 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1994 VL 312 IS 1-2 BP 10 EP 20 DI 10.1016/0039-6028(94)90799-4 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NQ051 UT WOS:A1994NQ05100006 ER PT J AU LILL, T BUSMANN, HG REIF, B HERTEL, IV AF LILL, T BUSMANN, HG REIF, B HERTEL, IV TI DISSOCIATION OF C-60(+) IONS IN COLLISION WITH A NI(100) SURFACE SO SURFACE SCIENCE LA English DT Article ID HOPG GRAPHITE; NI 100; CARBON; DIFFRACTION; RESILIENCE; SCATTERING; OXYGEN; PHASE; LEED AB Collisions of C60+ ions with clean and oxygen-covered Ni(100) surfaces have been studied under UHV conditions. We observed that in contrast to scattering from oriented graphite (HOPG) and diamond (111) Buckminster fullerene ions are not stable against collisions with a Ni(100) surface. AES and LEED measurements show a complete dissociation of the C60+ at this surface forming a c(2 x 2)C-p4g superstructure. Broad LEED extra spots, even for coverages below 0.33, are discussed to be the result of domain formation due to the peculiarities of such a kind of carbon deposition. C1 MAX BORN INST NON LINEAR OPT & SHORT SPECT,RUDOWET CHAUSSEE 6,D-12489 BERLIN,GERMANY. FRAUNHOFER INST ANGEW MAT FORSCH,D-28717 BREMEN,GERMANY. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 30 TC 26 Z9 26 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1994 VL 312 IS 1-2 BP 124 EP 130 DI 10.1016/0039-6028(94)90809-5 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NQ051 UT WOS:A1994NQ05100016 ER PT J AU PEDEN, CHF SHINN, ND AF PEDEN, CHF SHINN, ND TI OXIDATION OF W(110) - VALENCE-BAND AND W(4F) CORE-LEVEL SPECTROSCOPY SO SURFACE SCIENCE LA English DT Article ID HIGH COVERAGE; OXYGEN; ADSORPTION; SURFACE; W(100); KINETICS; W(001) AB The initial stages of W(110) oxidation have been characterized by surface-sensitive W(4f) core-level photoemission, with the surface-sensitivity provided by the use of tunable synchrotron radiation for excitation. Specific W(4f) photoemission features are assigned to W-atoms bonded to oxygen at coverages below and above 1/2 monolayer (ML). The higher coverage oxygen-induced peaks are at a significantly higher binding energy, which is consistent with an increase in the coordination of W to O and, correspondingly, an increase in the extent of charge transfer between W and O. These results are also consistent with previous temperature-programmed desorption (TPD) studies. Notably, the TPD experiments have demonstrated that only atomic oxygen is desorbed for oxygen coverages (theta0) below 1/2 ML, while suboxides of tungsten (WO(x), x = 1-3) are observed as desorption products for theta0 > 1/2 ML. Changes we observe in the valence-band spectra may also be reconciled within this model. C1 SANDIA NATL LABS 1114, DEPT SURFACE SCI, ALBUQUERQUE, NM 87185 USA. RP PEDEN, CHF (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, MS K2-12, RICHLAND, WA 99352 USA. OI Peden, Charles/0000-0001-6754-9928 NR 21 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 1 PY 1994 VL 312 IS 1-2 BP 151 EP 156 DI 10.1016/0039-6028(94)90812-5 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NQ051 UT WOS:A1994NQ05100019 ER PT J AU PAKBAZ, K LEE, CH HEEGER, AJ HAGLER, TW MCBRANCH, D AF PAKBAZ, K LEE, CH HEEGER, AJ HAGLER, TW MCBRANCH, D TI NATURE OF THE PRIMARY PHOTOEXCITATIONS IN POLY(ARYLENE-VINYLENES) SO SYNTHETIC METALS LA English DT Article ID PHOTOINDUCED ELECTRON-TRANSFER; LIGHT-EMITTING-DIODES; CONJUGATED POLYMERS; 3RD-HARMONIC GENERATION; POLY(PARA-PHENYLENE VINYLENE); TRANSIENT PHOTOCONDUCTIVITY; POLYPARAPHENYLENE VINYLENE; CONDUCTING POLYMERS; BAND DESCRIPTION; ABSORPTION AB We present an overview of the optical properties and related experimental results obtained from poly(para-phenylene vinylene), PPV, and its soluble derivatives, and we critically examine the interpretation of these data in the context of both the band model and the exciton model of the electronic structure of these semiconducting and luminescent polymers. Results obtained from highly oriented and structurally ordered PPVs demonstrate that the observed disparities between the physical properties of PPV and the polydiacetylenes (PDAs) are not due to disorder; these differences are intrinsic and arise from the fundamental difference in the nature of the low energy photoexcited states: excitons in the PDAs and free carriers in the PPVs. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP PAKBAZ, K (reprint author), UNIV CALIF SANTA BARBARA,INST POLYMERS & ORGAN SOLIDS,SANTA BARBARA,CA 93106, USA. RI Lee, Changhee/A-2471-2009 OI Lee, Changhee/0000-0003-2800-8250 NR 66 TC 122 Z9 123 U1 2 U2 9 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 JUN PY 1994 VL 64 IS 2-3 BP 295 EP 306 DI 10.1016/0379-6779(94)90127-9 PG 12 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA NY732 UT WOS:A1994NY73200029 ER PT J AU GEBRE, GM KUHNS, MR BRANDLE, JR AF GEBRE, GM KUHNS, MR BRANDLE, JR TI ORGANIC SOLUTE ACCUMULATION AND DEHYDRATION TOLERANCE IN 3 WATER-STRESSED POPULUS-DELTOIDES CLONES SO TREE PHYSIOLOGY LA English DT Article DE EASTERN COTTONWOOD; ELECTROLYTE LEAKAGE; INJURY INDEX; MEMBRANE STABILITY; OSMOTIC ADJUSTMENT; OSMOTIC POTENTIAL; SUGARS; WATER STRESS AB The relationship between osmotic potential, water-soluble organic solutes and electrolyte leakage was investigated in three greenhouse-grown eastern cottonwood (Populus deltoides Bartr.) clones. The Ohio Red (from southern Ohio) and Platte (from eastern Nebraska) clones were selected because they differ in dehydration tolerance, gas exchange and osmotic potential. A third clone, Wildcat (from westem Nebraska) was included because of its origin in a very dry area. Plants were either watered daily (control) or watered every 4-6 days (preconditioned). A third group of plants was watered daily until it was water-stressed at the end of the experiment (nonconditioned). Leaves for osmotic potential and water-soluble solute determinations were sampled at predawn after plants were rewatered. All clones showed osmotic adjustment ranging from 0.23 to 0.48 MPa. Organic solutes contributed up to 48% of the total osmotic adjustment. The solutes that contributed at least -0.05 MPa each to leaf osmotic potential in any clone were sucrose, malic acid, glucose, fructose, myoinositol and salicin. Fructose and glucose concentrations were unchanged or declined in preconditioned Ohio Red and Platte but increased in Wildcat. The Ohio Red clone had the highest sucrose concentration in both well-watered and preconditioned plants, and a lower injury index (more membrane stability) than Wildcat in the preconditioned plants, whereas nonconditioned Platte displayed the greatest electrolyte leakage of all clones and treatments. Cell membrane stability was correlated to osmotic potential and sucrose concentration only in Ohio Red. RP GEBRE, GM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Kuhns, Michael/D-6956-2014 NR 0 TC 36 Z9 38 U1 0 U2 5 PU HERON PUBLISHING PI VICTORIA PA BOX 5579 STATION B, VICTORIA BC V8R 6S4, CANADA SN 0829-318X J9 TREE PHYSIOL JI Tree Physiol. PD JUN PY 1994 VL 14 IS 6 BP 575 EP 587 PG 13 WC Forestry SC Forestry GA NR715 UT WOS:A1994NR71500003 ER PT J AU RUBIN, EM SMITH, DJ AF RUBIN, EM SMITH, DJ TI ATHEROSCLEROSIS IN MICE - GETTING TO THE HEART OF A POLYGENIC DISORDER SO TRENDS IN GENETICS LA English DT Review ID APOLIPOPROTEIN-A-I; EXPRESSING HUMAN APOLIPOPROTEIN(A); DENSITY-LIPOPROTEIN CHOLESTEROL; ESTER TRANSFER PROTEIN; TRANSGENIC MICE; GENE; SUSCEPTIBILITY; HYPERCHOLESTEROLEMIA; ATHEROGENESIS; MOUSE AB The mouse is being increasingly used as a model system for understanding the common and complex polygenic condition of atherosclerosis. Mice have been created in which genes involved in this condition have been overexpressed or have been altered by gene targeting. Here, we concentrate on recent experiments that use transgenic and gene knockout mice as an in vivo assay system to unravel the interactions between various genes involved in atherogenesis. We focus in particular on examples in which unique insights into the human condition have been derived from studies in mice. RP RUBIN, EM (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DEPT CELL & MOLEC BIOL, BERKELEY, CA 94720 USA. NR 31 TC 17 Z9 18 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0168-9525 J9 TRENDS GENET JI Trends Genet. PD JUN PY 1994 VL 10 IS 6 BP 199 EP 203 DI 10.1016/0168-9525(94)90256-9 PG 5 WC Genetics & Heredity SC Genetics & Heredity GA NN336 UT WOS:A1994NN33600008 PM 8073533 ER PT J AU THOMAS, G AF THOMAS, G TI MICROSTRUCTURAL ANALYSES OF ADVANCED INORGANIC MATERIALS SO ULTRAMICROSCOPY LA English DT Article ID SILICON-NITRIDE CERAMICS; ALUMINUM NITRIDE; PHASE CRYSTALLIZATION; STRENGTH; DEFECTS; GLASS; SI3N4; Y2O3; FABRICATION; BEHAVIOR AB We live and work in a world of materials. Modern technology depends critically on the availability of advanced materials, e.g., in transportation, communications, data processing, production systems, etc., and more and more emphasis is being placed on research and development of materials. In order to tailor materials to meet specific performance requirements (mechanical/physical properties), it is essential to understand the relationships Synthesis and Processing - Structure - Performance. Processing develops microstructure, mesostructure and chemical distribution of the components. These in turn determine properties. In order to characterize these features, high resolution techniques such as electron microscopy, microdiffraction and microanalysis are required. This paper, dedicated to Professor H. Hashimoto who has made so many outstanding contributions to the field, gives two examples of the applications of electron microscopy to understanding and developing advanced ceramics, viz. silicon nitride and aluminum nitride. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP THOMAS, G (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA, USA. NR 44 TC 0 Z9 0 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 1994 VL 54 IS 2-4 BP 145 EP 155 DI 10.1016/0304-3991(94)90113-9 PG 11 WC Microscopy SC Microscopy GA PA598 UT WOS:A1994PA59800006 ER PT J AU MILLER, MK AF MILLER, MK TI ATOM-PROBE FIELD-ION MICROSCOPY SO VACUUM LA English DT Article ID STATISTICAL-ANALYSIS; ALLOYS; DECOMPOSITION; SCALE; MICROSTRUCTURES; MICROANALYSIS; BEHAVIOR; STEELS; APFIM RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 63 TC 1 Z9 1 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0042-207X J9 VACUUM JI Vacuum PD JUN-JUL PY 1994 VL 45 IS 6-7 BP 819 EP 831 DI 10.1016/0042-207X(94)90117-1 PG 13 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NQ527 UT WOS:A1994NQ52700013 ER PT J AU KADA, J HEIT, M MILLER, KM AF KADA, J HEIT, M MILLER, KM TI CHRONOLOGY OF ANTHROPOGENIC TRACE-ELEMENT INPUT TO 4 UTAH LAKES RECONSTRUCTED USING SEDIMENT CORES SO WATER AIR AND SOIL POLLUTION LA English DT Article ID PB-210; CS-137; MARINE AB Trace element deposition chronologies are presented for radionuclide dated sediment cores collected from four Utah lakes. A core collected from Mirror Lake, a remote lake located in northern Utah, records a century long period of atmospheric deposition of anthropogenic Pb, Zn, Cu, Cd and Sn. Trace element concentration profiles in a core collected from Panguitch Lake, a remote lake located in southern Utah, give no indication of enhanced atmospheric deposition of trace elements in that part of the state. Sediment cores collected from Echo Reservoir and Deer Creek Reservoir, located near Salt Lake City, record releases of Pb, Zn, Cu, Cd, As, Sb, and Tl rich mine wastes into watershed streams from the now defunct Park City mining complex. RP KADA, J (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 22 TC 7 Z9 7 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD JUN PY 1994 VL 75 IS 3-4 BP 353 EP 369 DI 10.1007/BF00482946 PG 17 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA NT308 UT WOS:A1994NT30800010 ER PT J AU THOMSON, BM TURNEY, WR AF THOMSON, BM TURNEY, WR TI MINERALS AND MINE DRAINAGE SO WATER ENVIRONMENT RESEARCH LA English DT Article ID CHEMISTRY; ALUMINUM C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP THOMSON, BM (reprint author), UNIV NEW MEXICO,DEPT CIVIL ENGN,ALBUQUERQUE,NM 87131, USA. NR 34 TC 0 Z9 0 U1 0 U2 0 PU WATER ENVIRONMENT FEDERATION PI ALEXANDRIA PA 601 WYTHE ST, ALEXANDRIA, VA 22314-1994 SN 1061-4303 J9 WATER ENVIRON RES JI Water Environ. Res. PD JUN PY 1994 VL 66 IS 4 BP 415 EP 417 PG 3 WC Engineering, Environmental; Environmental Sciences; Limnology; Water Resources SC Engineering; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA NW438 UT WOS:A1994NW43800022 ER PT J AU DOUGHTY, C LONG, JCS HESTIR, K BENSON, SM AF DOUGHTY, C LONG, JCS HESTIR, K BENSON, SM TI HYDROLOGIC CHARACTERIZATION OF HETEROGENEOUS GEOLOGIC MEDIA WITH AN INVERSE METHOD BASED ON ITERATED FUNCTION SYSTEMS SO WATER RESOURCES RESEARCH LA English DT Article ID STEADY-STATE CONDITIONS; SOIL-WATER PROPERTIES; AQUIFER PARAMETERS; FRACTAL FRAGMENTATION; TRANSIENT; POROSITY AB One way to estimate the hydrologic properties of heterogeneous geologic media is to invert well test data using multiple observation wells. Pressure transients observed during a well test are compared to the corresponding values obtained by numerically simulating the test using a mathematical model. The parameters of the mathematical model are varied and the simulation repeated until a satisfactory match to the observed pressure transients is obtained, at which point the model parameters are accepted as providing a possible representation of the hydrologic property distribution. Restricting the search to parameters that represent self-similar (fractal) hydrologic property distributions can improve the inversion process. Far fewer parameters are needed to describe a hierarchical medium, improving the efficiency and robustness of the inversion. Additionally, each parameter set produces a hydrologic property distribution with a hierarchical structure, which mimics the multiple scales of heterogeneity often seen in natural geological media. The parameters varied during the inversion create fractal sets known as attractors, using an iterated function system (IFS). An attractor is mapped to a distribution of transmissivity and storativity in the mathematical model. Thus the IFS inverse method searches for the parameters of the IFS (typically tens of parameters) rather than the values of the hydrologic property distribution directly (typically hundreds to thousands of parameters). Application of the IFS inverse method to synthetic data shows that the method works well for simple heterogeneities. Application to field data from a sand/clay sedimentary sequence and a fractured granite produces reasonable results. C1 UTAH STATE UNIV,DEPT MATH & STAT,LOGAN,UT 84322. RP DOUGHTY, C (reprint author), LAWRENCE BERKELEY LAB,DIV EARTH SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Doughty, Christine/G-2389-2015 NR 26 TC 13 Z9 13 U1 0 U2 2 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 1994 VL 30 IS 6 BP 1721 EP 1745 DI 10.1029/94WR00585 PG 25 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA NN744 UT WOS:A1994NN74400007 ER PT J AU WOOD, BD DAWSON, CN SZECSODY, JE STREILE, GP AF WOOD, BD DAWSON, CN SZECSODY, JE STREILE, GP TI MODELING CONTAMINANT TRANSPORT AND BIODEGRADATION IN A LAYERED POROUS-MEDIA SYSTEM SO WATER RESOURCES RESEARCH LA English DT Article ID BIOLOGICALLY REACTING SOLUTES; PHYSIOLOGICAL DIVERSITY; SUBSURFACE SEDIMENTS; MATHEMATICAL-MODELS; SATURATED SOILS; COASTAL-PLAIN; SUBSTRATE; AQUIFERS; GROUNDWATER; SIMULATION AB The transport and biodegradation of an organic compound (quinoline) were studied in a meter-scale system of layered porous media. A two-dimensional laboratory experiment was conducted in a saturated system with two hydraulic layers with a ratio of conductivities of 1:13. A solution containing dissolved quinoline was injected as a front at one end of the system, and the aqueous-phase concentrations of quinoline, its first degradation product (2-hydroxyquinoline), and oxygen were monitored over time at several spatial locations. Results from a set of ancillary batch and small-column experiments were used to generate a mathematical model for the microbial kinetics; these kinetics described the time rate of change of the concentrations of the two organic compounds (quinoline and 2-hydroxyquinoline), the electron acceptor (oxygen), and microbial biomass. This independently developed kinetic model was incorporated into a two-dimensional numerical model for flow and transport, so that simulations of the laboratory system could be conducted and the results compared with observed data. An analysis of the applicability of single-phase and multiple-phase models for the description of the microbial kinetics was conducted. The results of this analysis indicated that for some cases, it is not necessary to explicitly model the mass transfer between the aqueous phase and the biomass phase. A single-phase model was used for simulating the laboratory system described here. Favorable comparisons between the laboratory and simulation data suggested that a single-phase model was appropriate for describing the microbially mediated reactions in this system. A method for incorporating the effects of metabolic lag into microbial kinetics is described. Metabolic lag was explicitly accounted for in the degradation kinetics for this system; the inclusion of metabolic lag proved to be important for describing transient concentration pulses that were observed in the low-conductivity layer. C1 RICE UNIV, DEPT MATH SCI, HOUSTON, TX 77001 USA. RP WOOD, BD (reprint author), PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, POB 999, RICHLAND, WA 99352 USA. RI Wood, Brian/K-4025-2012; Wood, Brian/J-8362-2013 OI Wood, Brian/0000-0003-3152-7852; Wood, Brian/0000-0003-3152-7852 NR 53 TC 56 Z9 58 U1 3 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUN PY 1994 VL 30 IS 6 BP 1833 EP 1845 DI 10.1029/94WR00434 PG 13 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA NN744 UT WOS:A1994NN74400014 ER PT J AU BENTALEB, M LUBKIEWICZ, E SCHULZ, N DURELL, JL LIDEN, F PEARSON, CJ PHILLIPS, WR SHANNON, J VARLEY, BJ LISTER, CJ AHMAD, I MORSS, LR NASH, KL WILLIAMS, CW AF BENTALEB, M LUBKIEWICZ, E SCHULZ, N DURELL, JL LIDEN, F PEARSON, CJ PHILLIPS, WR SHANNON, J VARLEY, BJ LISTER, CJ AHMAD, I MORSS, LR NASH, KL WILLIAMS, CW TI HIGH-SPIN STATES IN THE NEUTRON-RICH FISSION FRAGMENTS XE-138 AND XE-139 SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Note ID OCTUPOLE AB High-spin structures in the neutron-rich nuclei 138Xe and 139Xe have been investigated by observing prompt gamma-rays from the spontaneous fission of Cm-248 with the Eurogam spectrometer. The partial level schemes were constructed on the basis of double-, triple- and quadruple-gamma coincidences. The ground state band in 138Xe has been extended up to 5 MeV excitation energy. The structure of the newly observed medium-spin states in 139Xe is similar to the one of heavier N = 85 isotones where nuf7/2(3), nuh9/2f7/2(2) and nuf7/2(3) x 3- multiplets have been observed. C1 YALE UNIV,AW WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. UNIV MANCHESTER,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. RP BENTALEB, M (reprint author), UNIV LOUIS PASTEUR,IN2P3,CNRS,CTR RECH NUCL,BP 20,F-67037 STRASBOURG,FRANCE. NR 10 TC 17 Z9 17 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-7922 J9 Z PHYS A-HADRON NUCL JI Z. Phys. A.-Hadrons Nuclei PD JUN PY 1994 VL 348 IS 4 BP 245 EP 246 DI 10.1007/BF01305877 PG 2 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA NU860 UT WOS:A1994NU86000003 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A NOVAK, N OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A 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L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI STUDY OF HARD SCATTERING PROCESSES IN MULTIHADRON PRODUCTION FROM GAMMA-GAMMA COLLISIONS AT LEP SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CROSS-SECTION; PHOTON STRUCTURE; Q2; HADRONS AB The production of multihadronic states in gammagamma collisions at LEP has been studied with the DELPHI detector. The analyzed data correspond to an integrated luminosity of about 32 pb-1, collected in the LEP runs of 1990-1992. Minimum bias data and a sample of events with jets at high p(T) have been selected under the requirement that no scattered electron or positron is observed. The two data sets have been compared to Monte Carlo. predictions. The non-perturbative contribution described by the vector meson dominance Model and direct qqBAR production from pointlike photons described by the quark parton model were found to be insufficient to reproduce the data. It has been necessary to include a third interaction component, which is due to perturbative hard scattering of the partonic constituents of the photon. Several parametrisations of the quark and gluon densities of the photon have been tested. The interplay with the cut in jet transverse momentum, which is necessary for the separation of the perturbative and non-perturbative regions, is discussed. 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Phys. C-Part. Fields PD JUN PY 1994 VL 62 IS 3 BP 357 EP 365 PG 9 WC Physics, Particles & Fields SC Physics GA NU858 UT WOS:A1994NU85800001 ER PT J AU MASARIK, J PISUTOVA, N PISUT, J AF MASARIK, J PISUTOVA, N PISUT, J TI DIMUON SIGNATURE OF THE PRESENCE OF HIGH-DENSITY MATTER IN SULFUR-TUNGSTEN ION COLLISIONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID QUARK-GLUON PLASMA; ULTRARELATIVISTIC NUCLEAR COLLISIONS; J-PSI-SUPPRESSION; DILEPTON EMISSION; PHASE-TRANSITION; PHI-ENHANCEMENT; PAIR PRODUCTION; HADRONS; PHOTON AB It is pointed out that accurate information about shapes of dilepton spectra in central, intermediate and peripheral S-W ion collisions at high energy may provide a convincing evidence of the formation of matter with high density, In principle, it is also possible to obtain information about the nature of this matter but the evidence is less convincing. C1 COMENIUS UNIV BRATISLAVA,DEPT NUCL PHYS,CS-84215 BRATISLAVA,SLOVAKIA. RP MASARIK, J (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 32 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1994 VL 62 IS 3 BP 499 EP 502 DI 10.1007/BF01555910 PG 4 WC Physics, Particles & Fields SC Physics GA NU858 UT WOS:A1994NU85800016 ER PT J AU ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ALKHAZOV, G ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A BYKOV, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLO, R CAVALLO, N CERRADA, M CESARONI, F CHAMIZO, M CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F DELACRUZ, B CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICHG, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTINOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, MW GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HOU, SR HU, G HU, GQ LLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW JOSAMUTUBERRIA, IJ KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KUIJTEN, H KUMAR, KS KUNIN, A DEGUEVARA, PL LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, W LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALGERI, L MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARZANO, F MASSARO, GG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIAZ, MA NIPPE, A NOAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S ROBOHM, A RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANCHEZ, E SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, D STICOZZI, F STONE, H STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GE SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TING, SCC TING, SM TOKER, O TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL TUUVA, T ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, CR WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ALKHAZOV, G ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A BYKOV, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLO, R CAVALLO, N CERRADA, M CESARONI, F CHAMIZO, M CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F DELACRUZ, B CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, JH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICHG, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTINOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, MW GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HOU, SR HU, G HU, GQ LLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW JOSAMUTUBERRIA, IJ KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KUIJTEN, H KUMAR, KS KUNIN, A DEGUEVARA, PL LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, W LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALGERI, L MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARZANO, F MASSARO, GG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIAZ, MA NIPPE, A NOAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S ROBOHM, A RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANCHEZ, E SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, D STICOZZI, F STONE, H STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GE SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TING, SCC TING, SM TOKER, O TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL TUUVA, T ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, CR WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI MEASUREMENT OF CROSS-SECTIONS AND LEPTONIC FORWARD-BACKWARD ASYMMETRIES AT THE Z-POLE AND DETERMINATION OF ELECTROWEAK PARAMETERS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID FERMION PAIR PRODUCTION; CARLO EVENT GENERATOR; LUND MONTE-CARLO; W-BOSON MASS; BHABHA SCATTERING; RADIATIVE-CORRECTIONS; PHOTON CORRECTIONS; JET FRAGMENTATION; TAU-POLARIZATION; E+E ANNIHILATION AB We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at the Z peak with the L3 detector at LEP. The total luminosity of 40.8 pb-1 collected in the years 1990, 1991 and 1992 corresponds to 1.09 . 10(6) hadronic and 0.98 . 10(5) leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: M(Z) = 91 195 +/- 9 MeV GAMMA(Z) = 2494 +/- 10 MeV GAMMA(had) = 1748 +/- 10 MeV GAMMA(l) = 83.49 +/- 0.46 MeV, assuming lepton universality. We obtain an invisible width of GAMMA(inv) = 496.5 +/- 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of N(v) = 2.981 +/- 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g(V)-l = -0.0378(+0.0045/-0.0042) g(A)-l = -0.4998 +/- 0.0014 Within the framework of the Standard Model, and including our measurements of the Z --> bbBAR forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin2 theta(W)BAR = 0.2326 +/- 0.0012. We obtain an estimate for the strong coupling constant, alpha(s) = 0.142 +/- 0.013, and for the top-quark mass, m(t) = 158(+32/-40) +/- 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass. C1 NATL INST HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. RHEIN WESTFAL TH AACHEN,INST PHYS 3,D-52056 AACHEN,GERMANY. LAB ANNECY LE VIEUX PHYS PARTICULES,LAPP,IN2P3,CNRS,F-74941 ANNECY LE VIEUX,FRANCE. UNIV MICHIGAN,ANN ARBOR,MI 48109. INST HIGH ENERGY PHYS,BEIJING 10039,PEOPLES R CHINA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. INFN,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY. BOSTON UNIV,BOSTON,MA 02215. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. NORTHEASTERN UNIV,BOSTON,MA 02115. INST ATOM PHYS,R-76900 BUCHAREST,ROMANIA. HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST 114,HUNGARY. HARVARD UNIV,CAMBRIDGE,MA 02139. UNIV BUCHAREST,R-76900 BUCHAREST,ROMANIA. MIT,CAMBRIDGE,MA 02139. INFN,SEZ FIRENZE,I-50125 FLORENCE,ITALY. UNIV FLORENCE,I-50125 FLORENCE,ITALY. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. WORLD LAB,FBLJA PROJECT,CH-1211 GENEVA 23,SWITZERLAND. UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND. CHINESE UNIV SCI & TECHNOL,USTC,HEFEI 230029,PEOPLES R CHINA. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. UNIV LAUSANNE,CH-1015 LAUSANNE,SWITZERLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV LYON 1,INST PHYS NUCL LYON,CNRS,F-69622 VILLEURBANNE,FRANCE. CTR INVEST ENERGET,MEDIOAMBIENTALES,E-28040 MADRID,SPAIN. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA. INFN,SEZ NAPOLI,I-80125 NAPLES,ITALY. UNIV NAPLES,I-80125 NAPLES,ITALY. CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS,6525 ED NIJMEGEN,NETHERLANDS. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. CALTECH,PASADENA,CA 91125. INFN,SEZ PERUGIA,I-06100 PERUGIA,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. PRINCETON UNIV,PRINCETON,NJ 08544. INFN,SEZ ROMA,I-00185 ROME,ITALY. UNIV ROMA LA SAPIENZA,I-00185 ROME,ITALY. ST PETERSBURG NUCL PHYS INST,ST PETERSBURG,RUSSIA. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. UNIV SANTIAGO,DEPT FIS PARTICULAS ELEMENTALES,E-15706 SANTIAGO,SPAIN. SHANGHAI INST CERAM,SHANGHAI,PEOPLES R CHINA. BULGARIAN ACAD SCI,INST MECHATRON,BU-1113 SOFIA,BULGARIA. KOREA ADV INST SCI & TECHNOL,CTR HIGH ENERGY PHYS,TAEJON 305701,SOUTH KOREA. PURDUE UNIV,W LAFAYETTE,IN 47907. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. DESY,INST HOCHENERGIEPHYS,D-15738 ZEUTHEN,GERMANY. SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND. UNIV HAMBURG,D-22761 HAMBURG,GERMANY. INFN,SEZ MILANO,I-20133 MILAN,ITALY. UNIV ALABAMA,TUSCALOOSA,AL 35486. RP ACCIARRI, M (reprint author), RHEIN WESTFAL TH AACHEN,INST PHYS,D-52056 AACHEN,GERMANY. RI Vogel, Helmut/N-8882-2014; Fiandrini, Emanuele/C-4549-2008; van der Zwaan, Bob/F-4070-2015; Lista, Luca/C-5719-2008; D'Alessandro, Raffaello/F-5897-2015; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012; Cerrada, Marcos/J-6934-2014; Josa, Isabel/K-5184-2014; Gonzalez Romero, Enrique/L-7561-2014; Berdugo, Javier/A-2858-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Sanchez, Eusebio/H-5228-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Tsaregorodtsev, Andrei/E-3873-2016; Ferguson, Thomas/O-3444-2014 OI Diemoz, Marcella/0000-0002-3810-8530; Vogel, Helmut/0000-0002-6109-3023; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Berdugo, Javier/0000-0002-7911-8532; Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Ferguson, Thomas/0000-0001-5822-3731 NR 77 TC 65 Z9 65 U1 1 U2 12 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUN PY 1994 VL 62 IS 4 BP 551 EP 573 PG 23 WC Physics, Particles & Fields SC Physics GA NV085 UT WOS:A1994NV08500002 ER PT J AU BEYER, HJ HAMDY, H ZOHNY, EIM HAMOUD, KR ELFAYOUMI, MAK KLEINPOPPEN, H ABDALLAH, J CLARK, REH CSANAK, G AF BEYER, HJ HAMDY, H ZOHNY, EIM HAMOUD, KR ELFAYOUMI, MAK KLEINPOPPEN, H ABDALLAH, J CLARK, REH CSANAK, G TI ELECTRON-IMPACT COHERENCE PARAMETERS FOR THE EXCITATION OF THE 5 (1)P STATE OF SR SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article; Proceedings Paper CT 7th International Symposium on Polarization and Correlation in Electronic and Atomic Collisions CY JUL 29-31, 1993 CL BIELEFELD, GERMANY ID PHOTON COINCIDENCE EXPERIMENTS; CROSS-SECTIONS; POLARIZATION; ORIENTATION; ALIGNMENT; MAGNESIUM; HELIUM; COLLISIONS; SCATTERING AB Electron-photon polarization correlation measurements have been carried out for the excitation of the 5 1P state of Sr at electron impact energies of 30.3 and 58.4 eV and electron scattering. angles of 20-degrees-130-degrees for 30.3 eV and 20-degrees-100-degrees for 58.4 eV. The resulting Stokes parameters P1, P2, P3 are used to derive the usual complete scattering parameter sets lambda, chi and gamma, L(perpendicular-to), P(l). New FOMBT calculations for these parameters are reported alongside the measured data and show substantial agreement with the experiment and with recent calculations by Srivastava et al. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. CAIRO UNIV,BENI SEUF FAC SCI,DEPT PHYS,CAIRO,EGYPT. RP BEYER, HJ (reprint author), UNIV STIRLING,ATOM & MOLEC PHYS UNIT,STIRLING FK9 4LA,SCOTLAND. NR 41 TC 9 Z9 9 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD JUN PY 1994 VL 30 IS 2-3 BP 91 EP 97 PG 7 WC Physics, Atomic, Molecular & Chemical SC Physics GA NU859 UT WOS:A1994NU85900004 ER PT J AU CSANAK, G CARTWRIGHT, DC MACHADO, LE MENESES, GD AF CSANAK, G CARTWRIGHT, DC MACHADO, LE MENESES, GD TI ELECTRON-IMPACT POLARIZATION AND CORRELATION-PROPERTIES OF THE INERT-GASES SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article; Proceedings Paper CT 7th International Symposium on Polarization and Correlation in Electronic and Atomic Collisions CY JUL 29-31, 1993 CL BIELEFELD, GERMANY ID PHOTON COINCIDENCE EXPERIMENTS; EXCITATION CROSS-SECTIONS; CORRELATION PARAMETERS; KRYPTON; ARGON; NEON; SCATTERING; COHERENCE; ORIENTATION; ALIGNMENT AB For the heavier rare-gas targets, Ne, Ar, Kr, there is now a reasonable amount of experimental electron impact coherence parameter data available for excitation of the lowest J = 1 states. Theoretical results for those rare-gas targets, have been restricted to distorted-wave approximation (DWA) type theories. We present a systemization of the experimental data and compare them with available theoretical results. In the case of the heavy rare gases, we compare the experimental and theoretical data available for the three species, Ne, Ar, Kr, in order to identify trends. We compare the experimental data with results from available theories (mainly DWA type) and discuss the importance of spin-orbit coupling effects and ''shell'' effects. We present our point-of-view as to the physical picture that is emerging from all collisional data, and conclude by recommending future experimental and theoretical activities that will, from our perspective, provide new insight into the physics of these processes. C1 UNIV ESTADUAL CAMPINAS,BR-13100 CAMPINAS,SP,BRAZIL. FED UNIV SAO CARLOS,SAO CARLOS,BRAZIL. RP CSANAK, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 38 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD JUN PY 1994 VL 30 IS 2-3 BP 105 EP 114 PG 10 WC Physics, Atomic, Molecular & Chemical SC Physics GA NU859 UT WOS:A1994NU85900006 ER PT J AU MENESES, GD BRESCANSIN, LM LEE, MT MICHELIN, SE MACHADO, LE CSANAK, G AF MENESES, GD BRESCANSIN, LM LEE, MT MICHELIN, SE MACHADO, LE CSANAK, G TI COHERENCE AND CORRELATION PARAMETERS FOR THE D(3) PI(U)- (V=0,1,2,3 N=1) STATES OF H2 SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article; Proceedings Paper CT 7th International Symposium on Polarization and Correlation in Electronic and Atomic Collisions CY JUL 29-31, 1993 CL BIELEFELD, GERMANY ID ELECTRON PHOTON COINCIDENCE; EXCITATION; IMPACT; H-2 AB We have applied the density matrix formalism and the distorted-wave approximation to calculate the Stokes parameters for the d3 PI(u)-(upsilon = 0,1,2,3; N = 1). states of H-2 excited from the X1 SIGMA(g)+ (upsilon = O, N = 1) state by electron impact at the incident energies ranging from 15 to 40 eV Our results show that these parameters are nearly independent of the vibrational quantum number of the excited states. However, the polarization of the radiation emitted by the target in the subsequent decay process increases with increasing incident energies. C1 UNIV FED SAO CARLOS,DEPT FIS,BR-13560 SAO CARLOS,SP,BRAZIL. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV FED SAO CARLOS,DEPT QUIM,BR-13560 SAO CARLOS,SP,BRAZIL. RP MENESES, GD (reprint author), UNICAMP,INST FIS GLEB WATAGHIN,BR-13083970 CAMPINAS,SP,BRAZIL. RI Inst. of Physics, Gleb Wataghin/A-9780-2017 NR 20 TC 1 Z9 1 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD JUN PY 1994 VL 30 IS 2-3 BP 173 EP 175 PG 3 WC Physics, Atomic, Molecular & Chemical SC Physics GA NU859 UT WOS:A1994NU85900017 ER PT J AU SARGEANT, GA EBERHARDT, LE PEEK, JM AF SARGEANT, GA EBERHARDT, LE PEEK, JM TI THERMOREGULATION BY MULE DEER (ODOCOILEUS-HEMIONUS) IN ARID RANGELANDS OF SOUTH-CENTRAL WASHINGTON SO JOURNAL OF MAMMALOGY LA English DT Article DE ODOCOILEUS-HEMIONUS; THERMOREGULATION; PHYSIOLOGY; BEHAVIOR ID WHITE-TAILED DEER; SEASONAL ENERGY EXPENDITURES; RECTAL TEMPERATURES; AMBIENT-TEMPERATURE; METABOLISM; FAWNS; RESPONSES; MOOSE AB Temperature-sensitive, radiotelemetry transmitters were used to measure body temperatures of six free-ranging, adult, female mule deer (Odocoileus hemionus) in the semi-arid shrub-steppe of southcentral Washington from 1988 to 1990. Body temperatures ranged from 37.5 to 39.7-degrees-C and were similar to rectal temperatures reported for Odocoileus. Temperatures followed distinct circannual and circadian patterns unrelated to changes in air temperature or solar radiation. Behavioral thermoregulation may have been important in helping deer avoid thermal stress at environmental temperatures that often exceeded 25-degrees-C. On hot, clear days, deer sought beds that provided refuge from solar radiation yet permitted radiative heat loss. C1 PACIFIC NW LAB, RICHLAND, WA 98943 USA. UNIV IDAHO, DEPT FISH & WILDLIFE RESOURCES, MOSCOW, ID 83843 USA. NR 44 TC 24 Z9 27 U1 2 U2 7 PU AMER SOC MAMMALOGISTS PI PROVO PA BRIGHAM YOUNG UNIV, DEPT OF ZOOLOGY, PROVO, UT 84602 SN 0022-2372 J9 J MAMMAL JI J. Mammal. PD MAY 31 PY 1994 VL 75 IS 2 BP 536 EP 544 DI 10.2307/1382578 PG 9 WC Zoology SC Zoology GA NQ195 UT WOS:A1994NQ19500035 ER PT J AU DESHMUKH, S HESS, WP AF DESHMUKH, S HESS, WP TI CL (2PJ) FINE-STRUCTURE QUANTUM YIELDS FROM UV DISSOCIATION OF PCL3, CCL4, CHCL3 AND CL2 IN A SUPERSONIC JET SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article; Proceedings Paper CT XVIth International Conference on Photochemistry CY AUG 01-06, 1993 CL UNIV BRIT COLUMBIA, VANCOUVER, CANADA SP ACE GLASS INC, BATTLE PACIFIC NW LABS, DUPONT CANADA INC, ELSEVIER SEQUOIA SA, EXCITON INC, INTEROPTICS CO, LUMONICS INC, QUADRA LOG TECHNOL INC, ROHM & HAAS CO, XEROX RES CTR CANADA, CANADIAN SOC CHEM, DIV PHYS & THEORET CHEM, CTR EXCELLENCE MOLEC & INTERFACIAL DYNAM, GOVT CANADA, ENVIRONM CANADA, GOVT PROV ALBERTA, GOVT PROV BRIT COLUMBIA, MINIST ENVIRONM LANDS & PKS, INT AMER PHOTOCHEM SOC, INT SCI FDN, NAT SCI & ENGN RES COUNCIL CANADA, SIMON FRASER UNIV, STEACIE INST MOLEC SCI, NATL RES COUNCIL CANADA, UNIV BRIT COLUMBIA, UNIV SASKATCHEWAN HO UNIV BRIT COLUMBIA ID ENHANCED MULTIPHOTON IONIZATION; CHLORINE ATOMS; PHOTODISSOCIATION; RATIOS AB Jet-cooled phosphorus trichloride, carbon tetrachloride, chloroform and molecular chlorine are photodissociated in the UV wavelength range 235-238 nm. Chlorine atom photofragments Cl (P-2(3/2)) and Cl* (P-2(1/2)) are detected via resonance-enhanced (2 + 1) ionization throughout the 232-238 nm wavelength region. The relative Cl* yields, phi* = [Cl*]/([Cl] + [Cl*]), are measured for both Cl-35 and Cl-37 isotopes using the two-photon atomic transitions at 235.3 nm for Cl and 237.8 nm for Cl*. Preliminary results indicate that the Cl* yields are different for the two isotopes for some of the precursors. In addition, we obtained the two-photon oscillator strength of the Cl transition at 237.7 nm relative to the Cl* transition at 237.8 nm. The advantage of using the two-photon Cl transition at 237.7 nm for quantum yield measurements is discussed. RP DESHMUKH, S (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, MS K2-14,POB 999, RICHLAND, WA 99352 USA. NR 18 TC 6 Z9 6 U1 0 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD MAY 31 PY 1994 VL 80 IS 1-3 BP 17 EP 21 DI 10.1016/1010-6030(93)01005-M PG 5 WC Chemistry, Physical SC Chemistry GA NR311 UT WOS:A1994NR31100004 ER PT J AU WU, M HALL, GE AF WU, M HALL, GE TI VECTOR AND SCALAR CORRELATIONS IN THE PHOTODISSOCIATION OF NCCN SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article; Proceedings Paper CT XVIth International Conference on Photochemistry CY AUG 01-06, 1993 CL UNIV BRIT COLUMBIA, VANCOUVER, CANADA SP ACE GLASS INC, BATTLE PACIFIC NW LABS, DUPONT CANADA INC, ELSEVIER SEQUOIA SA, EXCITON INC, INTEROPTICS CO, LUMONICS INC, QUADRA LOG TECHNOL INC, ROHM & HAAS CO, XEROX RES CTR CANADA, CANADIAN SOC CHEM, DIV PHYS & THEORET CHEM, CTR EXCELLENCE MOLEC & INTERFACIAL DYNAM, GOVT CANADA, ENVIRONM CANADA, GOVT PROV ALBERTA, GOVT PROV BRIT COLUMBIA, MINIST ENVIRONM LANDS & PKS, INT AMER PHOTOCHEM SOC, INT SCI FDN, NAT SCI & ENGN RES COUNCIL CANADA, SIMON FRASER UNIV, STEACIE INST MOLEC SCI, NATL RES COUNCIL CANADA, UNIV BRIT COLUMBIA, UNIV SASKATCHEWAN HO UNIV BRIT COLUMBIA ID VELOCITY DISTRIBUTIONS; UNIMOLECULAR REACTIONS; DYNAMICS; C2N2; SPECTROSCOPY; FRAGMENTS; PROFILES AB The CN photofragments from the photodissociation of NCCN at 193 nm have been measured by high-resolution transient absorption spectroscopy. Doppler-broadened profiles of isolated rotational lines in the 2-0 and 3-1 vibrational bands of the CN A-X transition were observed under collisionless conditions with a tunable, single-frequency Ti:sapphire ring laser. Analysis of the Doppler profiles reveals a vector correlation between the translation and rotation of CN photoproducts, with the angular momentum of the high rotational states increasingly perpendicular to the recoil velocity. After correction for vector correlations, the laboratory-frame scalar speed distribution of state-selected photoproducts can be determined. The mean squared laboratory velocity is directly related to the average internal energy of coincident CN fragments. The wings of the Doppler profiles indicate that the available energy for a pair of ground state CN photoproducts following 193 nm dissociation of NCCN at 295 K is 5300 +/- 150 cm-1, which includes the average vibrational energy of the parent molecules selected by the photolysis laser. Phase space theory with an optimized available energy of 5300 cm-1 produces laboratory speed distributions that are in qualitatively reasonable agreement with the kinetic energy measurements, but overestimate the total internal energy of the photofragments. The measurements are good enough to warrant comparison with more sophisticated models of unimolecular decomposition. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Hall, Gregory/D-4883-2013 OI Hall, Gregory/0000-0002-8534-9783 NR 19 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD MAY 31 PY 1994 VL 80 IS 1-3 BP 45 EP 52 DI 10.1016/1010-6030(94)01053-6 PG 8 WC Chemistry, Physical SC Chemistry GA NR311 UT WOS:A1994NR31100008 ER PT J AU WOLF, M YANG, DL DURANT, JL AF WOLF, M YANG, DL DURANT, JL TI KINETIC-STUDIES OF NHX RADICAL REACTIONS SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article; Proceedings Paper CT XVIth International Conference on Photochemistry CY AUG 01-06, 1993 CL UNIV BRIT COLUMBIA, VANCOUVER, CANADA SP ACE GLASS INC, BATTLE PACIFIC NW LABS, DUPONT CANADA INC, ELSEVIER SEQUOIA SA, EXCITON INC, INTEROPTICS CO, LUMONICS INC, QUADRA LOG TECHNOL INC, ROHM & HAAS CO, XEROX RES CTR CANADA, CANADIAN SOC CHEM, DIV PHYS & THEORET CHEM, CTR EXCELLENCE MOLEC & INTERFACIAL DYNAM, GOVT CANADA, ENVIRONM CANADA, GOVT PROV ALBERTA, GOVT PROV BRIT COLUMBIA, MINIST ENVIRONM LANDS & PKS, INT AMER PHOTOCHEM SOC, INT SCI FDN, NAT SCI & ENGN RES COUNCIL CANADA, SIMON FRASER UNIV, STEACIE INST MOLEC SCI, NATL RES COUNCIL CANADA, UNIV BRIT COLUMBIA, UNIV SASKATCHEWAN HO UNIV BRIT COLUMBIA ID MOLECULAR-ENERGIES; REACTION NH2+NO; RATE-CONSTANT; GAS-PHASE; THEORETICAL CHARACTERIZATION; TEMPERATURE-RANGE; GAUSSIAN-1 THEORY; 2ND-ROW COMPOUNDS; AMMONIA FLAMES; + NO AB Combined experimental and theoretical studies of the reactions NH2(X2B1) + NO --> products (1) NH/ND(3SIGMA-) + NO --> products (2) and NH2(X2B1) + O --> products (3) were carried out in the present work. The rate constant of reaction (1) was investigated in the temperature range 293 K less-than-or-equal-to T less-than-or-equal-to 612 K using the laser photolysis continuous-wave laser-induced fluorescence technique for the production and detection of NH2. The results are well described by k1(T) = 5.43 X T-4.02 exp(-1034K/T) cm3 molecule-1 s-1. Stationary points on the potential energy surface were characterized using the GAUSSIAN-2 (G2) ab initio method. The surface is complex, with hydrogen-atom transfers and cis-trans isomerizations connecting five stable adduct species. The product distribution of reaction (2) was studied at room temperature using the discharge flow technique with mass spectrometric detection of the reaction products. Measured branching fractions for the production of N2O+H(D) were k2a/k2 = 0.84+/-0.4 for NH+NO and k2a/k2 = 0.87+/-0.17 for ND+NO. Stationary points on the ground 2A' surface were calculated using the G2 method. The transition state energy for the dissociation of the cis isomer into H+N2O was found to be lower than the transition state energy for dissociation into OH+N2. Additionally, trans-HNNO was found to isomerize to cis-HNNO before dissociation. For reaction (3), the molecular properties of all relevant intermediates and transition states on the ground state potential energy surface were determined using the G2 method. The results predict the formation of three intermediates, H2NO, trans-HNOH and cis-HNOH, all exothermic relative to the reactants. The transition states separating these intermediates from one another and their products (H-2+NO, H+HNO(1A') or NH+OH) were also characterized, several for the first time. C1 SANDIA NATL LABS, COMBUST RES FACIL, LIVERMORE, CA 94551 USA. NR 58 TC 21 Z9 21 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD MAY 31 PY 1994 VL 80 IS 1-3 BP 85 EP 93 DI 10.1016/1010-6030(93)01037-3 PG 9 WC Chemistry, Physical SC Chemistry GA NR311 UT WOS:A1994NR31100013 ER PT J AU BARBAS, JT DABESTANI, R SIGMAN, ME AF BARBAS, JT DABESTANI, R SIGMAN, ME TI A MECHANISTIC STUDY OF PHOTODECOMPOSITION OF ACENAPHTHYLENE ON A DRY SILICA SURFACE SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article; Proceedings Paper CT XVIth International Conference on Photochemistry CY AUG 01-06, 1993 CL UNIV BRIT COLUMBIA, VANCOUVER, CANADA SP ACE GLASS INC, BATTLE PACIFIC NW LABS, DUPONT CANADA INC, ELSEVIER SEQUOIA SA, EXCITON INC, INTEROPTICS CO, LUMONICS INC, QUADRA LOG TECHNOL INC, ROHM & HAAS CO, XEROX RES CTR CANADA, CANADIAN SOC CHEM, DIV PHYS & THEORET CHEM, CTR EXCELLENCE MOLEC & INTERFACIAL DYNAM, GOVT CANADA, ENVIRONM CANADA, GOVT PROV ALBERTA, GOVT PROV BRIT COLUMBIA, MINIST ENVIRONM LANDS & PKS, INT AMER PHOTOCHEM SOC, INT SCI FDN, NAT SCI & ENGN RES COUNCIL CANADA, SIMON FRASER UNIV, STEACIE INST MOLEC SCI, NATL RES COUNCIL CANADA, UNIV BRIT COLUMBIA, UNIV SASKATCHEWAN HO UNIV BRIT COLUMBIA ID PHOTOCHEMISTRY; MOLECULES; GEL; SIO2; PHOTOPROCESSES; LUMINESCENCE; PHOTOLYSIS; ZEOLITES; LASER AB The photochemistry of acenaphthylene (AC) has been studied on a dry silica surface at very low coverages (less than 10% of a monolayer) under aerated conditions. Adsorption of AC onto silica surface from cyclohexane follows a Freundlich adsorption isotherm, demonstrating a range of weak interactions between AC and the surface active sites. Photolysis of AC at the solid-air interface led to the formation of photo-oxidation products formed via the addition of singlet molecular oxygen to ground-state AC, and photodimers (cis and trans). The oxidation products include 1,2-acenaphthenedione (1), 2-hydroxy-1-acenaphthenone (2), 1,8-naphthalenedicarboxaldehyde (3) and 1,8-naphthalic anhydride (4). The yield of dimers increases as the surface coverage is raised. Both the excited singlet state and the excited triplet state of AC are involved in the observed dimerization on the surface. C1 OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831. NR 34 TC 32 Z9 32 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD MAY 31 PY 1994 VL 80 IS 1-3 BP 103 EP 111 DI 10.1016/1010-6030(93)01029-2 PG 9 WC Chemistry, Physical SC Chemistry GA NR311 UT WOS:A1994NR31100015 ER PT J AU ARNETT, KE VELSKO, SP WALBA, DM AF ARNETT, KE VELSKO, SP WALBA, DM TI HARMONIC-GENERATION IN FERROELECTRIC LIQUID-CRYSTALS - PHASE-MATCHING LOCI SO APPLIED PHYSICS LETTERS LA English DT Article ID 2ND-HARMONIC GENERATION; DESIGN AB Ferroelectric liquid crystals (FLCs), a new class of organic nonlinear materials have a variety of interesting properties and potential applications. Using commercial FLCs and an FLC mixture specifically formulated for enhanced nonlinear optical properties, we studied the room-temperature global phase-matching properties for type I and type II frequency doubling of 1.06-mum radiation. Although the second-harmonic coefficients of the different FLC mixtures differ by as much as two orders of magnitude, the phase-matching loci are remarkably similar. C1 DISPLAYTECH INC,BOULDER,CO 80301. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP ARNETT, KE (reprint author), UNIV COLORADO,DEPT CHEM,BOULDER,CO 80309, USA. RI Walba, David/F-7284-2013 NR 11 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 30 PY 1994 VL 64 IS 22 BP 2919 EP 2921 DI 10.1063/1.111411 PG 3 WC Physics, Applied SC Physics GA NN752 UT WOS:A1994NN75200003 ER PT J AU COOPER, EA NASTASI, M AF COOPER, EA NASTASI, M TI MIXING OF FE2O3 MARKERS INTO AMORPHOUS AND CRYSTALLINE ALUMINA SO APPLIED PHYSICS LETTERS LA English DT Article AB Thin markers of iron oxide embedded between sapphire and amorphous alumina were ion irradiated with Ar in a temperature range of -166-degrees-C to 700-degrees-C. The marker mixing was examined by Rutherford backscattering spectroscopy and found to have both a ballistic and a temperature dependent mixing regime with different levels of ballistic mixing and different temperature dependencies for the amorphous and crystalline matrices. RP COOPER, EA (reprint author), LOS ALAMOS NATL LAB,DIV MAT,LOS ALAMOS,NM 87545, USA. NR 12 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 30 PY 1994 VL 64 IS 22 BP 2958 EP 2960 DI 10.1063/1.111425 PG 3 WC Physics, Applied SC Physics GA NN752 UT WOS:A1994NN75200016 ER PT J AU BAUCOM, KC BIEFELD, RM AF BAUCOM, KC BIEFELD, RM TI GROWTH OF INSB USING TRIS(DIMETHYLAMINO)ANTIMONY AND TRIMETHYLINDIUM SO APPLIED PHYSICS LETTERS LA English DT Article ID PHASE EPITAXIAL-GROWTH; TRIISOPROPYLANTIMONY; TERTIARYBUTYLDIMETHYLANTIMONY AB We have grown epitaxial layers of InSb on p--InSb substrates by metalorganic chemical vapor deposition using tris(dimethylamino)antimony (TDMASb) and trimethylindium (TMIn). Growth temperatures from 285 to 500-degrees-C and pressures from 76 to 660 Torr have been investigated. The V/III ratio was varied from 0.63 to 8.6 using growth rates from 0.06 to 0.67 mum/h. For temperatures less-than-or-equal-to 425-degrees-C, the growth rate was proportional to the temperature. The growth rate was proportional to the TMIn flow at all temperatures. Temperatures >400-degrees-C produced p-type layers while growth temperatures less-than-or-equal-to 400-degrees-C produce n-type layers. The pyrolysis temperature of TDMASb appears to be lower than that of TMIn. RP BAUCOM, KC (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 10 TC 17 Z9 17 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 30 PY 1994 VL 64 IS 22 BP 3021 EP 3023 DI 10.1063/1.111391 PG 3 WC Physics, Applied SC Physics GA NN752 UT WOS:A1994NN75200037 ER PT J AU CHO, JH MALEY, MP WILLIS, JO COULTER, JY BULAEVSKII, LN HALDAR, P MOTOWIDLO, LR AF CHO, JH MALEY, MP WILLIS, JO COULTER, JY BULAEVSKII, LN HALDAR, P MOTOWIDLO, LR TI DETERMINATION OF THE SUPERCONDUCTING CURRENT PATH IN BI2223 AG TAPES SO APPLIED PHYSICS LETTERS LA English DT Article ID DISSIPATION AB We have measured the anisotropic transport properties of Bi2223/Ag tapes with and without the silver sheath. The anisotropy ratio of the resistivity along the rolling plane to the resistivity perpendicular to the rolling plane (approximately 4-10) is orders of magnitude smaller than single-crystal anisotropy ratios. Results are consistent with current flow along crystallographic ab planes even for transport normal to the tape plane. C1 INTERMAGNET GEN CORP,GUILDERLAND,NY 12084. IGC ADV SUPERCOND,WATERBURY,CT 06704. RP CHO, JH (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,MS K763,LOS ALAMOS,NM 87545, USA. NR 6 TC 36 Z9 36 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 30 PY 1994 VL 64 IS 22 BP 3030 EP 3032 DI 10.1063/1.111393 PG 3 WC Physics, Applied SC Physics GA NN752 UT WOS:A1994NN75200040 ER PT J AU SANI, RL GRESHO, PM AF SANI, RL GRESHO, PM TI RESUME AND REMARKS ON THE OPEN BOUNDARY-CONDITION MINISYMPOSIUM SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE NAVIER-STOKES; BOUSSINESQ; BOUNDARY CONDITION; OPEN; OUTFLOW ID BACKWARD-FACING STEP; VISCOUS INCOMPRESSIBLE-FLOW; FINITE-ELEMENT METHOD; BENCHMARK SOLUTION; IMPLEMENTATION; SIMULATIONS; STEADY AB The incompressible Navier-Stokes equations-and their thermal convection and stratified flow analogue, the Boussinesq equations-possess solutions in bounded domains only when appropriate/legitimate boundary conditions (BCs) are appended at all points on the domain boundary. When the boundary-or, more commonly, a portion of it-is not endowed with a Dirichlet BC, we are faced with selecting what are called open boundary conditions (OBCs), because the fluid may presumably enter or leave the domain through such boundaries. The two minisymposia on OBCs that are summarized in this paper had the objective of finding the best OBCs for a 'small subset of two-dimensional test problems. This objective, which of course is not really well-defined, was not met (we believe), but the contributions obtained probably raised many more questions/issues than were resolved-notable among them being the advent of a new class of OBCs that we call FBCs (fuzzy boundary conditions C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP SANI, RL (reprint author), UNIV COLORADO,DEPT CHEM ENGN,BOULDER,CO 80309, USA. NR 33 TC 142 Z9 143 U1 0 U2 8 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD MAY 30 PY 1994 VL 18 IS 10 BP 983 EP 1008 DI 10.1002/fld.1650181006 PG 26 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA NM346 UT WOS:A1994NM34600005 ER PT J AU SALCE, B GRAVIL, JL BOATNER, LA AF SALCE, B GRAVIL, JL BOATNER, LA TI DISORDER AND THERMAL TRANSPORT IN UNDOPED KTAO(3) SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID FERROELECTRIC PHASE-TRANSITION; RAMAN-SCATTERING; KTA1-XNBXO3; IMPURITY; MICROREGIONS; KTAO3-LI; ORDER; PURE AB The thermal conductivity of nominally pure KTaO3 exhibits an unexpected strong phonon scattering around 8 K. The question arises whether this scattering is related to the distorted microregions observed by other experiments. We have investigated a set of undoped single crystals grown by different methods. By comparison with doped specimens, it is suggested that acoustic phonons we coupled to the soft optic mode via the local disorder. From complementary dielectric permittivity and electron paramagnetic resonance experiments, oxygen vacancies and rhombic Fe3+ appear to be incontestable candidates to account for the distorted microregions. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37830 USA. RP CEA, DETP RECH FONDAMENTALE MAT CONDENSEE, SPSMS, LCP, F-38054 GRENOBLE 9, FRANCE. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 38 TC 81 Z9 82 U1 1 U2 13 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 EI 1361-648X J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAY 30 PY 1994 VL 6 IS 22 BP 4077 EP 4092 DI 10.1088/0953-8984/6/22/007 PG 16 WC Physics, Condensed Matter SC Physics GA NQ497 UT WOS:A1994NQ49700007 ER PT J AU MALTMAN, K GOLDMAN, T AF MALTMAN, K GOLDMAN, T TI MODELING THE OFF-SHELL DEPENDENCE OF PI-0-ETA MIXING WITH QUARK LOOPS SO NUCLEAR PHYSICS A LA English DT Article ID CHARGE-SYMMETRY; CHROMODYNAMICS; AMPLITUDE; MESONS AB It is shown that including form factors for the quark-pseudoscalar-meson couplings of the Georgi-Manohar chiral quark model allows one to obtain the leading off-shell dependence of pi0eta mixing (as predicted by chiral perturbation theory) from the effect of quark loops on the meson propagators. Implications for rho0omega mixing and for the effects on meson mixing contributions to few-body charge symmetry breaking observables are also discussed. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP MALTMAN, K (reprint author), YORK UNIV,DEPT MATH & STAT,N YORK M3J 1P3,ONTARIO,CANADA. NR 25 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 30 PY 1994 VL 572 IS 3-4 BP 682 EP 692 DI 10.1016/0375-9474(94)90406-5 PG 11 WC Physics, Nuclear SC Physics GA NQ126 UT WOS:A1994NQ12600008 ER PT J AU DODELSON, S KNOX, L KOLB, EW AF DODELSON, S KNOX, L KOLB, EW TI TESTING INFLATION WITH THE COSMIC MICROWAVE BACKGROUND SO PHYSICAL REVIEW LETTERS LA English DT Article ID GRAVITATIONAL-WAVES; COSMOLOGICAL PERTURBATIONS; GRAND UNIFICATION; COBE SATELLITE; UNIVERSE; ANISOTROPY; RADIATION; FLUCTUATIONS; CONSTRAINTS; MODELS AB Cosmic microwave background (CMB) anisotropy may result from both scalar and tensor perturbations. For a sufficiently narrow range of angular scales, CMB perturbations can be characterized by four parameters. Results from the Cosmic Background Explorer fix one combination of the parameters, reducing the parameters to three. If CMB perturbations are from inflation, there is an additionaL relation, reducing the parameters to two. An appropriate combination of a medium-angLe and a small-angle CMB observation can test the inflation hypothesis because inflation cannot explain a high signal in one experiment and a low signal in the other. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP DODELSON, S (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 40 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3444 EP 3447 DI 10.1103/PhysRevLett.72.3444 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700002 ER PT J AU ARROYO, CG KING, BJ BACHMANN, KT BAZARKO, AO BOLTON, T FOUDAS, C LEFMANN, WC LEUNG, WC MISHRA, SR OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, HM YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK KINNEL, T SANDLER, PH SMITH, WH AF ARROYO, CG KING, BJ BACHMANN, KT BAZARKO, AO BOLTON, T FOUDAS, C LEFMANN, WC LEUNG, WC MISHRA, SR OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, HM YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK KINNEL, T SANDLER, PH SMITH, WH TI PRECISE MEASUREMENT OF THE WEAK MIXING ANGLE IN NEUTRINO-NUCLEON SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID RADIATIVE-CORRECTIONS; MUON PRODUCTION; HADRONS; GEV/C; RATIO AB We report a precise measurement of the weak mixing angle from the ratio of neutral current to charged current inclusive cross sections in deep-inelastic neutrino-nucleon scattering. The data were gathered at the CCFR neutrino detector in the Fermilab quadrupole-triplet neutrino beam, with neutrino energies up to 600 GeV. Using the on-shell definition, sin2 theta(W) = 1 - M(W)2/M(Z)2, we obtain sin2 theta(W) = 0.2218 +/- 0.0025(stat) +/- 0.0036(expt syst) +/- 0.0040(model). C1 UNIV CHICAGO,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ROCHESTER,ROCHESTER,NY 14627. RP ARROYO, CG (reprint author), COLUMBIA UNIV,NEW YORK,NY 10027, USA. OI Bernstein, Robert/0000-0002-7610-950X NR 32 TC 35 Z9 35 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3452 EP 3455 DI 10.1103/PhysRevLett.72.3452 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700004 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ARETI, H AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GAGLIARDI, G GALLINARO, M GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J HENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUSTON, J HUTH, J HYLEN, J NCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, HS KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KRASBERG, M KROLL, J KRUSE, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MICHAIL, G MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MULLER, T MUSGRAVE, P NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OHL, KE OISHI, R OKUSAWA, T PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A STRAHL, K STRAIT, J SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLESTRUP, A TONNISON, J DETROCONIZ, JF TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F UNAL, G VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WILSON, P WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ARETI, H AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GAGLIARDI, G GALLINARO, M GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J HENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUSTON, J HUTH, J HYLEN, J NCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, HS KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KRASBERG, M KROLL, J KRUSE, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MICHAIL, G MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MULLER, T MUSGRAVE, P NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OHL, KE OISHI, R OKUSAWA, T PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A STRAHL, K STRAIT, J SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLESTRUP, A TONNISON, J DETROCONIZ, JF TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F UNAL, G VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WILSON, P WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF THE B+ AND B0 MESON LIFETIMES SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRON LIFETIME; AVERAGE LIFETIME; BEAUTY DECAYS; DETECTOR; MODEL AB The lifetimes of the B+ and B0 mesons have been measured using fully reconstructed decays. In a sample of approximately 49 600 J/psi --> mu+mu- decays recorded with the Collider Detector at Fermilab, 148 +/- 16 B+ and 121 +/- 16 B0 mesons have been reconstructed using the silicon vertex detector. Unbinned likelihood fits to the proper lifetime distributions of these B mesons give tau+ = 1.61 +/- 0.16 (stat) +/- 0.05 (syst) ps, tau0 = 1.57 +/- 0.18 (stat) +/- 0.08 (syst) ps, and tau+/tau0 = 1.02 +/- 0.16 (stat) +/- 0.05 (syst). C1 UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27708. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCAWTI,ITALY. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. UNIV TORONTO,TORONTO M5S 1A1,ONTARIO,CANADA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. OSAKA CITY UNIV,OSAKA 588,JAPAN. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. PURDUE UNIV,W LAFAYETTE,IN 47907. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RI Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Tartarelli, Giuseppe Francesco/A-5629-2016; OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; Tartarelli, Giuseppe Francesco/0000-0002-4244-502X; Wyss, Jeffery/0000-0002-8277-4012; Bertolucci, Sergio/0000-0003-1738-4736; Benlloch Baviera, Jose Maria/0000-0001-6073-1436; Turini, Nicola/0000-0002-9395-5230 NR 29 TC 26 Z9 26 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3456 EP 3460 DI 10.1103/PhysRevLett.72.3456 PG 5 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700005 ER PT J AU JEONG, SC HERRMANN, N FAN, ZG FREIFELDER, R GOBBI, A HILDENBRAND, KD KRAMER, M RANDRUP, J REISDORF, W SCHULL, D SODAN, U TEH, K WESSELS, JP PELTE, D TRZASKA, M WIENOLD, T ALARD, JP AMOUROUX, V BASRAK, Z BASTID, N BELAYEV, IM BERGER, L BINI, M BLAICH, T BOUSSANGE, S BUTA, A CAPLAR, R CERRUTI, C CINDRO, N COFFIN, JP DONA, R DUPIEUX, P ERO, J FINTZ, P FODOR, Z FRAYSSE, L FROLOV, S GRIGORIAN, Y GUILLAUME, G HOLBLING, S HOUARI, A JUNDT, F KECSKEMETI, J KONCZ, P KORCHAGIN, Y KOTTE, R KUHN, C IBNOUZAHIR, M LEGRAND, I LEBEDEV, A MAGUIRE, C MANKO, V MAURENZIG, P MGEBRISHVILI, G MOSNER, J MOISA, D MONTAROU, G MONTBEL, I MOREL, P NEUBERT, W OLMI, A PASQUALI, G PETROVICI, M POGGI, G RAMI, F RAMILLIEN, V SADCHIKOV, A SERES, Z SIKORA, B SIMION, V SMOLYANKIN, S TEZKRATT, R VSILIEV, MA WAGNER, P WILHELMI, Z WOHLFARTH, D ZHILIN, AV AF JEONG, SC HERRMANN, N FAN, ZG FREIFELDER, R GOBBI, A HILDENBRAND, KD KRAMER, M RANDRUP, J REISDORF, W SCHULL, D SODAN, U TEH, K WESSELS, JP PELTE, D TRZASKA, M WIENOLD, T ALARD, JP AMOUROUX, V BASRAK, Z BASTID, N BELAYEV, IM BERGER, L BINI, M BLAICH, T BOUSSANGE, S BUTA, A CAPLAR, R CERRUTI, C CINDRO, N COFFIN, JP DONA, R DUPIEUX, P ERO, J FINTZ, P FODOR, Z FRAYSSE, L FROLOV, S GRIGORIAN, Y GUILLAUME, G HOLBLING, S HOUARI, A JUNDT, F KECSKEMETI, J KONCZ, P KORCHAGIN, Y KOTTE, R KUHN, C IBNOUZAHIR, M LEGRAND, I LEBEDEV, A MAGUIRE, C MANKO, V MAURENZIG, P MGEBRISHVILI, G MOSNER, J MOISA, D MONTAROU, G MONTBEL, I MOREL, P NEUBERT, W OLMI, A PASQUALI, G PETROVICI, M POGGI, G RAMI, F RAMILLIEN, V SADCHIKOV, A SERES, Z SIKORA, B SIMION, V SMOLYANKIN, S TEZKRATT, R VSILIEV, MA WAGNER, P WILHELMI, Z WOHLFARTH, D ZHILIN, AV TI COLLECTIVE MOTION IN SELECTED CENTRAL COLLISIONS OF AU ON AU AT 150A MEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; RELATIVISTIC NUCLEAR COLLISIONS; QUANTUM MOLECULAR-DYNAMICS; HADRONIC MATTER; CROSS-SECTIONS; FLOW; EQUATION; STATE; BLAST AB Using the FOPI facility at GSI Darmstadt, complete data of Au on Au collisions at 150A MeV were collected for charged products (Z = 1-15) at laboratory angles 1-degrees less-than-or-equal-to THETA(lab) less-than-or-equal-to 30-degrees. Central collisions were selected by applying various criteria. The kinetic energy spectra of fragments from an isolated midrapidity source axe investigated in detail for center-of-mass angles 25-degrees < THETA(c.m.) less-than-or-equal-to 45-degrees. The heavy products (Z greater-than-or-equal-to 3) are used to determine the collective energy which is found to be at least 10A MeV. C1 UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY. UNIV FLORENCE,I-50121 FLORENCE,ITALY. UNIV MAINZ,W-6500 MAINZ,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV STRASBOURG 1,F-67070 STRASBOURG,FRANCE. INST PHYS & NUCL ENGN,BUCHAREST,ROMANIA. HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST,HUNGARY. RUDJER BOSKOVIC INST,41001 ZAGREB,CROATIA. UNIV WARSAW,INST EXPTL PHYS,PL-00325 WARSAW,POLAND. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CLERMONT FERRAND,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,PHYS CORP LAB,CLERMONT FERRAND,FRANCE. IST NAZL FIS NUCL,FLORENCE,ITALY. MOSCOW EXPTL & THEORET PHYS,MOSCOW,RUSSIA. IV KURCHATOV ATOM ENERGY INST,MOSCOW,RUSSIA. FORSCHUNGSZENTRUM,ROSSENDORF,GERMANY. RP JEONG, SC (reprint author), GESELL SCHWERIONENFORSCH MBH,W-6100 DARMSTADT 11,GERMANY. OI PASQUALI, GABRIELE/0000-0002-3166-3857 NR 30 TC 140 Z9 144 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 30 PY 1994 VL 72 IS 22 BP 3468 EP 3471 DI 10.1103/PhysRevLett.72.3468 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700008 ER PT J AU FLORIZONE, REJ ASAI, J FELDMAN, G HALLIN, EL SKOPIK, DM VOGT, JM HAIGHT, RC STERBENZ, SM AF FLORIZONE, REJ ASAI, J FELDMAN, G HALLIN, EL SKOPIK, DM VOGT, JM HAIGHT, RC STERBENZ, SM TI SIMULTANEOUS MEASUREMENT OF THE (GAMMA,P) (GAMMA-N) CROSS-SECTION RATIO IN HE-4 AS A TEST OF CHARGE-SYMMETRY SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHOTODISINTEGRATION; H-3(P,GAMMA)HE-4; SCATTERING; BREAKING AB We have measured (gamma,p) and (gamma,n) differential yields at 90-degrees for the two-body photodisintegration of He-4 using tagged photons of energy E(gamma) = 25-60 MeV. Data for both channels were obtained simultaneously using windowless DELTAE-E telescopes to detect the He-3 and H-3 recoils. The ratio of our angle-integrated yields, which is insensitive to systematic uncertainties due to the simultaneity of the measurements, agrees with calculations employing only charge-symmetric nuclear interactions. Thus, within the present errors, our data show no evidence of a significant charge-symmetry violation in He-4 in this energy range. C1 UNIV SASKATCHEWAN,SASKATCHEWAN ACCLERATOR LAB,SASKATOON S7N 0W0,SASKATCHEWAN,CANADA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 22 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3476 EP 3479 DI 10.1103/PhysRevLett.72.3476 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700010 ER PT J AU ZAMFIR, NV CASTEN, RF BRENNER, DS AF ZAMFIR, NV CASTEN, RF BRENNER, DS TI EVOLUTION OF PRECOLLECTIVE NUCLEI AND A TRIPARTITE CLASSIFICATION OF NUCLEAR-STRUCTURE SO PHYSICAL REVIEW LETTERS LA English DT Article AB Precollective nuclei, that is, those with E(4(1)+)/E(2(1)+) < 2.0, are shown to evolve structurally in a very simple and universal way, in which E(4(1)+) is linear against E(2(1)+) with a slope of unity. A clue to this behavior is provided in terms of a seniority upsilon =0 pair addition mode. Combined with recent studies of vibrator and rotor nuclei, this ''seniority'' regime gives a new tripartite global characterization of the evolution of nuclear structure. C1 CLARK UNIV,WORCESTER,MA 01610. 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 4 TC 31 Z9 31 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3480 EP 3482 DI 10.1103/PhysRevLett.72.3480 PG 3 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700011 ER PT J AU STRACHAN, JD ADLER, H ALLING, P ANCHER, C ANDERSON, H ANDERSON, JL ASHCROFT, D BARNES, CW BARNES, G BATHA, S BELL, MG BELL, R BITTER, M BLANCHARD, W BRETZ, NL BUDNY, R BUSH, CE CAMP, R CAORLIN, M CAUFFMAN, S CHANG, Z CHENG, CZ COLLINS, J COWARD, G DARROW, DS DELOOPER, J DUONG, H DUDEK, L DURST, R EFTHIMION, PC ERNST, D FISHER, R FONCK, RJ FREDERICKSON, E FROMM, N FU, GY FURTH, HP GENTILE, C GORELENKOV, N GREK, B GRISHAM, LR HAMMETT, G HANSON, GR HAWRYLUK, RJ HEIDBRINK, W HERRMANN, HW HILL, KW HOSEA, J HSUAN, H JANOS, A JASSBY, DL JOBES, FC JOHNSON, DW JOHNSON, LC KAMPERSCHROER, J KUGEL, H LAM, NT LAMARCHE, PH LOUGHLIN, MJ LEBLANC, B LEONARD, M LEVINTON, FM MACHUZAK, J MANSFIELD, DK MARTIN, A MAZZUCATO, E MAJESKI, R MARMAR, E MCCHESNEY, J MCCORMACK, B MCCUNE, DC MCGUIRE, KM MCKEE, G MEADE, DM MEDLEY, SS MIKKELSEN, DR MUELLER, D MURAKAMI, M NAGY, A NAZIKIAN, R NEWMAN, R NISHITANI, T NORRIS, M OCONNOR, T OLDAKER, M OSAKABE, M OWENS, DK PARK, H PARK, W PAUL, SF PEARSON, G PERRY, E PETROV, M PHILLIPS, CK PITCHER, S RAMSEY, AT RASMUSSEN, DA REDI, MH ROBERTS, D ROGERS, J ROSSMASSLER, R ROQUEMORE, AL RUSKOV, E SABBAGH, SA SASAO, M SCHILLING, G SCHIVELL, J SCHMIDT, GL SCOTT, SD TANG, W TAYLOR, G TERRY, JL THOMPSON, ME TUSZEWSKI, M VANNOY, C VONHALLE, A VONGOELER, S VOORHEES, D WALTERS, RT WIELAND, R WILGEN, JB WILLIAMS, M WILSON, JR WONG, KL WURDEN, GA YAMADA, M YOUNG, KM ZARNSTORFF, MC ZWEBEN, SJ AF STRACHAN, JD ADLER, H ALLING, P ANCHER, C ANDERSON, H ANDERSON, JL ASHCROFT, D BARNES, CW BARNES, G BATHA, S BELL, MG BELL, R BITTER, M BLANCHARD, W BRETZ, NL BUDNY, R BUSH, CE CAMP, R CAORLIN, M CAUFFMAN, S CHANG, Z CHENG, CZ COLLINS, J COWARD, G DARROW, DS DELOOPER, J DUONG, H DUDEK, L DURST, R EFTHIMION, PC ERNST, D FISHER, R FONCK, RJ FREDERICKSON, E FROMM, N FU, GY FURTH, HP GENTILE, C GORELENKOV, N GREK, B GRISHAM, LR HAMMETT, G HANSON, GR HAWRYLUK, RJ HEIDBRINK, W HERRMANN, HW HILL, KW HOSEA, J HSUAN, H JANOS, A JASSBY, DL JOBES, FC JOHNSON, DW JOHNSON, LC KAMPERSCHROER, J KUGEL, H LAM, NT LAMARCHE, PH LOUGHLIN, MJ LEBLANC, B LEONARD, M LEVINTON, FM MACHUZAK, J MANSFIELD, DK MARTIN, A MAZZUCATO, E MAJESKI, R MARMAR, E MCCHESNEY, J MCCORMACK, B MCCUNE, DC MCGUIRE, KM MCKEE, G MEADE, DM MEDLEY, SS MIKKELSEN, DR MUELLER, D MURAKAMI, M NAGY, A NAZIKIAN, R NEWMAN, R NISHITANI, T NORRIS, M OCONNOR, T OLDAKER, M OSAKABE, M OWENS, DK PARK, H PARK, W PAUL, SF PEARSON, G PERRY, E PETROV, M PHILLIPS, CK PITCHER, S RAMSEY, AT RASMUSSEN, DA REDI, MH ROBERTS, D ROGERS, J ROSSMASSLER, R ROQUEMORE, AL RUSKOV, E SABBAGH, SA SASAO, M SCHILLING, G SCHIVELL, J SCHMIDT, GL SCOTT, SD TANG, W TAYLOR, G TERRY, JL THOMPSON, ME TUSZEWSKI, M VANNOY, C VONHALLE, A VONGOELER, S VOORHEES, D WALTERS, RT WIELAND, R WILGEN, JB WILLIAMS, M WILSON, JR WONG, KL WURDEN, GA YAMADA, M YOUNG, KM ZARNSTORFF, MC ZWEBEN, SJ TI FUSION POWER PRODUCTION FROM TFTR PLASMAS FUELED WITH DEUTERIUM AND TRITIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON EMISSION; TEST REACTOR; CALIBRATION AB Peak fusion power production of 6.2 +/- 0.4 M W has been achieved in TFTR plasmas heated by deuterium and tritium neutral beams at a total power of 29.5 MW. These plasmas have an inferred central fusion alpha particle density of 1.2 x 10(17) m-3 without the appearance of either disruptive magnetohydrodynamics events or detectable changes in Alfven wave activity. The measured loss rate of energetic alpha particles agreed with the approximately 5% losses expected from alpha particles which are born on unconfined orbits. C1 FUS PHYS & TECHNOL,TORRANCE,CA 90501. GEN ATOM,SAN DIEGO,CA 92101. TRINITI,MOSCOW,RUSSIA. JET,JOINT UNDERTAKING,ABINGDON,ENGLAND. JAERI,NAKA FUS RES ESTAB,NAKA,JAPAN. NATL INST FUS SCI,NAGOYA,JAPAN. AF IOFFE PHYS TECH INST,ST PETERSBURG,RUSSIA. CANADIAN FUS FUELS TECHNOL PROJECT,TORONTO,ON,CANADA. COLUMBIA UNIV,NEW YORK,NY 10027. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV WISCONSIN,MADISON,WI 53706. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. MIT,CAMBRIDGE,MA 02139. UNIV CALIF IRVINE,IRVINE,CA 92717. COLUMBIA UNIV,NEW YORK,NY 10027. RP STRACHAN, JD (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014; Yamada, Masaaki/D-7824-2015; Wurden, Glen/A-1921-2017; Sabbagh, Steven/C-7142-2011; Hammett, Gregory/D-1365-2011; Ernst, Darin/A-1487-2010 OI Yamada, Masaaki/0000-0003-4996-1649; Wurden, Glen/0000-0003-2991-1484; Hammett, Gregory/0000-0003-1495-6647; Ernst, Darin/0000-0002-9577-2809 NR 22 TC 105 Z9 106 U1 1 U2 18 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3526 EP 3529 DI 10.1103/PhysRevLett.72.3526 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700023 ER PT J AU HAWRYLUK, RJ ADLER, H ALLING, P ANCHER, C ANDERSON, H ANDERSON, JL ASHCROFT, D BARNES, CW BARNES, G BATHA, S BELL, MG BELL, R BITTER, M BLANCHARD, W BRETZ, NL BUDNY, R BUSH, CE CAMP, R CAORLIN, M CAUFFMAN, S CHANG, Z CHENG, CZ COLLINS, J COWARD, G DARROW, DS DELOOPER, J DUONG, H DUDEK, L DURST, R EFTHIMION, PC ERNST, D FISHER, R FLONCK, RJ FREDERICKSON, E FROMM, N FU, GY FURTH, HP GENTILE, C GORELENKOV, N GREK, B GRISHAM, LR HAMMETT, G HANSON, GR HEIDBRINK, W HERRMANN, HW HILL, KW HOSEA, J HSUAN, H JANOS, A JASSBY, DL JOBES, FC JOHNSON, DW JOHNSON, LC KAMPERSCHROER, J KUGEL, H LAM, NT LAMARCHE, PH LOUGHLIN, MJ LEBLANC, B LEONARD, M LEVINTON, FM MACHUZAK, J MANSFIELD, DK MARTIN, A MAZZUCATO, E MAJESKI, R MARMAR, E MCCHESNEY, J MCCORMACK, B MCCUNE, DC MCGUIRE, KM MCKEE, G MEADE, DM MEDLEY, SS MIKKELSEN, DR MUELLER, D MURAKAMI, M NAGY, A NAZIKIAN, R NEWMAN, R NISHITANI, T NORRIS, M OCONNOR, T OLDAKER, M OSAKABE, M OWENS, DK PARK, H PARK, W PAUL, SF PEARSON, G PERRY, E PETROV, M PHILLIPS, CK PITCHER, S RAMSEY, A RASMUSSEN, DA REDI, MH ROBERTS, D ROGERS, J ROSSMASSLER, R ROQUEMORE, AL RUSKOV, E SABBAGH, SA SASAO, M SCHILLING, G SCHIVELL, J SCHMIDT, GL SCOTT, SD SISSINGH, R SKINNER, CH SNIPES, J STEVENS, J STEVENSON, T STRATTON, BC STRACHAN, JD SYNAKOWSKI, E TANG, W TAYLOR, G TERRY, JL THOMPSON, ME TUSZEWSKI, M VANNOY, C VONHALLE, A VONGOELER, S VOORHEES, D WALTERS, RT WIELAND, R WILGEN, JB WILLIAMS, M WILSON, JR WONG, KL WURDEN, GA YAMADA, M YOUNG, KM ZARNSTORFF, MC ZWEBEN, SJ AF HAWRYLUK, RJ ADLER, H ALLING, P ANCHER, C ANDERSON, H ANDERSON, JL ASHCROFT, D BARNES, CW BARNES, G BATHA, S BELL, MG BELL, R BITTER, M BLANCHARD, W BRETZ, NL BUDNY, R BUSH, CE CAMP, R CAORLIN, M CAUFFMAN, S CHANG, Z CHENG, CZ COLLINS, J COWARD, G DARROW, DS DELOOPER, J DUONG, H DUDEK, L DURST, R EFTHIMION, PC ERNST, D FISHER, R FLONCK, RJ FREDERICKSON, E FROMM, N FU, GY FURTH, HP GENTILE, C GORELENKOV, N GREK, B GRISHAM, LR HAMMETT, G HANSON, GR HEIDBRINK, W HERRMANN, HW HILL, KW HOSEA, J HSUAN, H JANOS, A JASSBY, DL JOBES, FC JOHNSON, DW JOHNSON, LC KAMPERSCHROER, J KUGEL, H LAM, NT LAMARCHE, PH LOUGHLIN, MJ LEBLANC, B LEONARD, M LEVINTON, FM MACHUZAK, J MANSFIELD, DK MARTIN, A MAZZUCATO, E MAJESKI, R MARMAR, E MCCHESNEY, J MCCORMACK, B MCCUNE, DC MCGUIRE, KM MCKEE, G MEADE, DM MEDLEY, SS MIKKELSEN, DR MUELLER, D MURAKAMI, M NAGY, A NAZIKIAN, R NEWMAN, R NISHITANI, T NORRIS, M OCONNOR, T OLDAKER, M OSAKABE, M OWENS, DK PARK, H PARK, W PAUL, SF PEARSON, G PERRY, E PETROV, M PHILLIPS, CK PITCHER, S RAMSEY, A RASMUSSEN, DA REDI, MH ROBERTS, D ROGERS, J ROSSMASSLER, R ROQUEMORE, AL RUSKOV, E SABBAGH, SA SASAO, M SCHILLING, G SCHIVELL, J SCHMIDT, GL SCOTT, SD SISSINGH, R SKINNER, CH SNIPES, J STEVENS, J STEVENSON, T STRATTON, BC STRACHAN, JD SYNAKOWSKI, E TANG, W TAYLOR, G TERRY, JL THOMPSON, ME TUSZEWSKI, M VANNOY, C VONHALLE, A VONGOELER, S VOORHEES, D WALTERS, RT WIELAND, R WILGEN, JB WILLIAMS, M WILSON, JR WONG, KL WURDEN, GA YAMADA, M YOUNG, KM ZARNSTORFF, MC ZWEBEN, SJ TI CONFINEMENT AND HEATING OF A DEUTERIUM-TRITIUM PLASMA SO PHYSICAL REVIEW LETTERS LA English DT Article ID TFTR AB The Tokamak Fusion Test Reactor has performed initial high-power experiments with the plasma fueled with nominally equal densities of deuterium and tritium. Compared to pure deuterium plasmas, the energy stored in the electron and ions increased by approximately 20%. These increases indicate improvements in confinement associated with the use of tritium and possibly heating of electrons by a particles created by the D-T fusion reactions. C1 FUS PHYS & TECHNOL,TORRANCE,CA 90501. GEN ATOM,SAN DIEGO,CA 92101. TRINITI,MOSCOW,RUSSIA. JET,JOINT UNDERTAKING,ABINGDON,ENGLAND. JAERI,NAKA FUS RES ESTAB,NAKA,JAPAN. NATL INST FUS SCI,NAGOYA,JAPAN. AF IOFFE PHYS TECH INST,ST PETERSBURG,RUSSIA. CANADIAN FUS FUELS TECHNOL PROJECT,TORONTO,ON,CANADA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. MIT,CAMBRIDGE,MA 02139. UNIV WISCONSIN,MADISON,WI 53706. UNIV CALIF IRVINE,IRVINE,CA 92717. COLUMBIA UNIV,NEW YORK,NY 10027. RP HAWRYLUK, RJ (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Sabbagh, Steven/C-7142-2011; Hammett, Gregory/D-1365-2011; Ernst, Darin/A-1487-2010; Cheng, Chio/K-1005-2014; Yamada, Masaaki/D-7824-2015; Wurden, Glen/A-1921-2017 OI Hammett, Gregory/0000-0003-1495-6647; Ernst, Darin/0000-0002-9577-2809; Yamada, Masaaki/0000-0003-4996-1649; Wurden, Glen/0000-0003-2991-1484 NR 14 TC 67 Z9 67 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3530 EP 3533 DI 10.1103/PhysRevLett.72.3530 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700024 ER PT J AU DEBOISSIEU, M STEPHENS, P BOUDARD, M JANOT, C CHAPMAN, DL AUDIER, M AF DEBOISSIEU, M STEPHENS, P BOUDARD, M JANOT, C CHAPMAN, DL AUDIER, M TI DISORDER AND COMPLEXITY IN THE ATOMIC-STRUCTURE OF THE PERFECT ICOSAHEDRAL ALLOY AL-PD-MN SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINGLE-QUASI-CRYSTAL; NEUTRON-DIFFRACTION; CU-FE; LI-CU; QUASICRYSTAL; ELASTICITY; ORDER; PHASE; RU AB The atomic structure of the perfect Al-Pd-Mn icosahedral phase has been studied on single grain samples. Using anomalous x-ray diffraction close to the Pd edge, the partial structure factor F(Pd) has been extracted. In the six-dimensional description of its structure, we find that the atomic surface cannot be described by an object with a sharp boundary. A phason Debye-Waller term has been introduced to fully account for the data. It is interpreted as resulting from random phason disorder and nonsphericity of the atomic surfaces. C1 SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. NR 44 TC 35 Z9 35 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 30 PY 1994 VL 72 IS 22 BP 3538 EP 3541 DI 10.1103/PhysRevLett.72.3538 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700026 ER PT J AU MARTINEZ, JC VANDERLINDEN, PJEM BULAEVSKII, LN BRONGERSMA, S KOSHELEV, A PERENBOOM, JAAJ MENOVSKY, AA KES, PH AF MARTINEZ, JC VANDERLINDEN, PJEM BULAEVSKII, LN BRONGERSMA, S KOSHELEV, A PERENBOOM, JAAJ MENOVSKY, AA KES, PH TI EQUILIBRIUM MAGNETIZATION OF A BI2SR2CACU2OX SINGLE-CRYSTAL MEASURED UP TO 20-T SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; LAYERED SUPERCONDUCTORS; VORTEX LATTICE; FLUCTUATIONS; TRANSITION; ANISOTROPY AB The reversible magnetization of a high quality Bi2Sr2CaCu2Ox crystal has been measured by torque magnetometry at fields up to 20 T and temperatures ranging from 40 to 100 K. For fields above 7 T the superconducting diamagnetic moment follows a simple London-like behavior (Ms is-proportional-to ln B). For lower fields, we observe a strong dependence of dM(S)/d ln B on the magnetic field B. The results axe discussed in terms of quantum and classical fluctuations of pancake vortices. C1 CATHOLIC UNIV NIJMEGEN,HIGH FIELD MAGNET LAB,6525 ED NIJMEGEN,NETHERLANDS. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. FREE UNIV AMSTERDAM HOSP,DEPT PHYS,1081 HV AMSTERDAM,NETHERLANDS. UNIV AMSTERDAM,DEPT PHYS,1018 XE AMSTERDAM,NETHERLANDS. CHERNOGOLOVKA SOLID STATE PHYS INST,CHERNOGOLOVKA 142432,RUSSIA. RP MARTINEZ, JC (reprint author), LEIDEN UNIV,KAMERLINGH ONNES LAB,2312 AV LEIDEN,NETHERLANDS. NR 16 TC 23 Z9 23 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 30 PY 1994 VL 72 IS 22 BP 3614 EP 3617 DI 10.1103/PhysRevLett.72.3614 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700045 ER PT J AU VILLAINGUILLOT, S DANDOLOFF, R SAXENA, A AF VILLAINGUILLOT, S DANDOLOFF, R SAXENA, A TI HEISENBERG SPINS ON AN INFINITE CYLINDER - A GEOMETRICAL EFFECT OF ANISOTROPY SO PHYSICS LETTERS A LA English DT Article ID CARBON NANOTUBES; FERROMAGNETS; SOLITONS AB We investigate the lowest energy levels of non-trivial spin distributions belonging to different homotopy classes and their dependence on the geometry of a cylinder. In the continuum limit the Hamiltonian of the system is given by the nonlinear sigma model. Bogomol'nyi's decomposition allows us to show that the equidistant energy levels are independent of geometry for isotropic spin systems. However, in the case of anisotropic spin-spin coupling, the energy levels are found to depend on the geometry. In the presence of a non-trivial spin distribution, the cylinder shrinks in the region of the soliton. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP VILLAINGUILLOT, S (reprint author), UNIV CERGY PONTOISE,PHYS STAT GRP,BP 8428,F-95806 CERGY,FRANCE. NR 8 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 30 PY 1994 VL 188 IS 4-6 BP 343 EP 346 DI 10.1016/0375-9601(94)90473-1 PG 4 WC Physics, Multidisciplinary SC Physics GA NP233 UT WOS:A1994NP23300009 ER PT J AU KUZEL, M DUBOIS, RD MAIER, R HEIL, O JAKUBASSAAMUNDSEN, DH LUCAS, MW GROENEVELD, KO AF KUZEL, M DUBOIS, RD MAIER, R HEIL, O JAKUBASSAAMUNDSEN, DH LUCAS, MW GROENEVELD, KO TI ELASTIC-SCATTERING OF QUASI-FREE ELECTRONS IN STRONGLY ASYMMETRIC COLLISIONS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID DIFFERENTIAL CROSS-SECTIONS; ION-ATOM COLLISIONS; EMISSION; HE+; PROJECTILE; XENON; PEAK; AR AB A systematic study of the doubly differential cross sections for the electron emission occurring in fast strongly asymmetric collisions is presented. Protons and atomic hydrogen (0.5 MeV) were collided with the heavy targets krypton and xenon under single collision conditions. The ejected electrons were observed at laboratory angles in the range 0-degrees less-than-or-equal-to theta(f) less-than-or-equal-to 180-degrees and with energies E(f) from 25 to 1400 eV. In addition to the familiar strong ejection in the forward direction (theta(f) almost-equal-to 0-degrees) arising from capture and loss to continuum states there is pronounced emission in the backward hemisphere for the case of atomic hydrogen projectiles. This is accompanied by large variations in the angular dependent singly differential cross section and in the energy and width of the electron loss peak as measured at particular angles. These fluctuations in the ability of a heavy target to ionize the structured projectile are a manifestation of a Ramsauer-Townsend effect and can be understood within the framework of quasi-free electron scattering by the target potential. We give a relativistic quantum mechanical model based on the electron impact approximation which shows good agreement with experiment for these strongly asymmetric collision systems. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV MUNICH, SEKT PHYS, D-85748 GARCHING, GERMANY. UNIV SUSSEX, SCH MATH & PHYS SCI, BRIGHTON BN1 9QH, E SUSSEX, ENGLAND. RP JOHANNES GUTENBERG UNIV, INST KERNPHYS, AUGUST EULER STR 6, D-60486 FRANKFURT, GERMANY. NR 30 TC 17 Z9 17 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-4075 EI 1361-6455 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAY 28 PY 1994 VL 27 IS 10 BP 1993 EP 2008 DI 10.1088/0953-4075/27/10/010 PG 16 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NQ495 UT WOS:A1994NQ49500010 ER PT J AU ANDREWS, A AF ANDREWS, A TI WILL THE SPACE CLIPPER STAY A DREAM SO NEW SCIENTIST LA English DT Article RP ANDREWS, A (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NEW SCIENTIST PUBL EXPEDITING INC PI ELMONT PA 200 MEACHAM AVE, ELMONT, NY 11003 SN 0262-4079 J9 NEW SCI JI New Sci. PD MAY 28 PY 1994 VL 142 IS 1927 BP 28 EP 31 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NP339 UT WOS:A1994NP33900029 ER PT J AU MA, D COOK, DN PON, NG HEARST, JE AF MA, D COOK, DN PON, NG HEARST, JE TI EFFICIENT ANCHORING OF RNA-POLYMERASE IN ESCHERICHIA-COLI DURING COUPLED TRANSCRIPTION-TRANSLATION OF GENES ENCODING INTEGRAL INNER MEMBRANE POLYPEPTIDES SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID TOPOISOMERASE-I MUTANTS; CYTOPLASMIC MEMBRANE; DNA; PROTEINS; DOMAINS; INVIVO; TRANSLOCATION; RESISTANCE; PROMOTER; TEMPLATE AB While it has been known that supercoliing of the DNA template can be induced by transcription, the mechanism and the efficiency of this process in vivo is not fully understood. We report here that transcription of genes encoding 16 S rRNA, a stable RNA species, or cytoplasmic polypeptides leads to very little or no detectable DNA supercoliing even under the optimum conditions in Escherichia coli. This indicates that hydrodynamic drag on the transcription complex (including RNA polymrase, nascent RNA, ribosomes, and nascent polypeptides) is not sufficient to anchor RNA polymerase during coupled transcription-translation. On the other hand, transcription of membrane-associated genes encoding integral inner membrane or exported periplasmic polypeptides leads to apparent DNA supercoliing. Transcription of genes encoding integral inner membrane polypeptides leads to significantly greater anchoring of RNA polymerase than does transcription of genes encoding periplasmic polypeptides. This may reflect differences in the coupling of transcription-translation with membrane association during expression of these two classes of polypeptides. Evidence is further presented to suggest that the anchoring of RNA polymerase is probably achieved through the interaction of nascent polypeptides with the cytoplasmic surface of the inner membrane during coupled transcription-translation. Moreover, transcription of a membrane-associated gene can, under certain circumstances, induce topological anchoring of an RNA polymerase transcribing a neighboring gene that ordinarily is not membrane-associated Finally, the potential biological consequences of our findings are discussed. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV STRUCT BIOL, BERKELEY, CA 94720 USA. FU NIGMS NIH HHS [R1 GM 41911A-03-NF-03/92] NR 21 TC 20 Z9 20 U1 0 U2 0 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 27 PY 1994 VL 269 IS 21 BP 15362 EP 15370 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NP738 UT WOS:A1994NP73800076 PM 8195175 ER PT J AU MOYER, JH LEETISCHLER, MJ KWON, HY SCHRICK, JJ AVNER, ED SWEENEY, WE GODFREY, VL CACHEIRO, NLA WILKINSON, JE WOYCHIK, RP AF MOYER, JH LEETISCHLER, MJ KWON, HY SCHRICK, JJ AVNER, ED SWEENEY, WE GODFREY, VL CACHEIRO, NLA WILKINSON, JE WOYCHIK, RP TI CANDIDATE GENE ASSOCIATED WITH A MUTATION CAUSING RECESSIVE POLYCYSTIC KIDNEY-DISEASE IN MICE SO SCIENCE LA English DT Article ID MOUSE CHROMOSOME-2; DNA; PROTEINS; MITOSIS; REGION; MODEL; MOTIF AB A line of transgenic mice was generated that contains an insertional mutation causing a phenotype similar to human autosomal recessive polycystic kidney disease. Homozygotes displayed a complex phenotype that included bilateral polycystic kidneys and an unusual liver lesion. The mutant locus was cloned and characterized through use of the transgene as a molecular marker. Additionally, a candidate polycystic kidney disease (PKD) gene was identified whose structure and expression are directly associated with the mutant locus. A complementary DNA derived from this gene predicted a peptide containing a motif that was originally identified in several genes involved in cell cycle control. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,GRAD SCH BIOMED SCI,DIV BIOL,OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV WASHINGTON,DEPT PEDIAT,SEATTLE,WA 98105. UNIV TENNESSEE,DEPT PATHOBIOL,KNOXVILLE,TN 37920. FU NICHD NIH HHS [R01 HD25323]; NIDDK NIH HHS [R01 DK45633-01]; NIEHS NIH HHS [IAG 222Y01-ES-10067] NR 41 TC 271 Z9 274 U1 0 U2 4 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 27 PY 1994 VL 264 IS 5163 BP 1329 EP 1333 DI 10.1126/science.8191288 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NN767 UT WOS:A1994NN76700046 PM 8191288 ER PT J AU MILLS, R MALHOTRA, R WOOLF, LA MILLER, DG AF MILLS, R MALHOTRA, R WOOLF, LA MILLER, DG TI DISTINCT DIFFUSION-COEFFICIENTS IN BINARY NONELECTROLYTE MIXTURES - FRAMES OF REFERENCE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VELOCITY CORRELATION-COEFFICIENTS; CROSS-CORRELATION COEFFICIENTS; LIQUID MIXTURES; ELECTROLYTE MIXTURES; LIGHT-SCATTERING; SELF-DIFFUSION; TRANSPORT; METHANOL; BENZENE AB Generalized transport coefficients are indispensable for the study of interactions between species of the same kind in binary solutions. Distinct diffusion coefficients are best suited for this purpose because of their finite limiting values and inherent symmetry. Equations are derived for the calculation of these coefficients from experimental data for the mass-, volume-, number-, and solvent-fixed frames of reference. Distinct diffusion coefficients in the 4 reference frames computed for 14 binary nonelectrolyte solutions show that the number-fixed frame is probably best suited for the comparison of the macroscopic properties of these solutions. A point of contention has been the frame of reference of the Friedman-Milis equation;(1) surprisingly, the mass-fixed frame describes its D-ij(d) values closely. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MILLS, R (reprint author), AUSTRALIAN NATL UNIV,RES SCH PHYS SCI,ATOM & MOLEC PHYS LAB,CANBERRA,ACT 0200,AUSTRALIA. NR 27 TC 28 Z9 28 U1 3 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 26 PY 1994 VL 98 IS 21 BP 5565 EP 5575 DI 10.1021/j100072a026 PG 11 WC Chemistry, Physical SC Chemistry GA NN508 UT WOS:A1994NN50800026 ER PT J AU ABT, I AHMED, T ANDREEV, V AID, S ANDRIEU, B APPUHN, RD ARPAGAUS, M BABAEV, A BARWOLFF, H BAIN, J BARANOV, P BARRELET, E BARTEL, W BASSLER, U BECK, HP BEHREND, HJ BELOUSOV, A BERGER, C BERGSTEIN, H BERNARDI, G BERNET, R BERTRANDCOREMANS, G BESACON, M BIDDDULPH, P BINDER, E BIZOT, JC BLOBEL, V BORRAS, K BOSETTI, PC BOUDRY, V BOURDARIOUS, C BRAEMER, A BRASSE, F BRAUN, U BRAUNSCHWEIG, W BRISSON, V BRUNDKO, D BUNGENER, L BURGER, J BUSSER, FW BUNIATIAN, A BURKE, S BUSCHHORN, G CAMPBELL, AJ CARLI, T CHARLES, F CYYLA, J CLARKE, D CLEGG, AB COLOMBO, M COUGLAN, JA COURAU, A COUTURES, C COZZIKA, G CRIEGEE, L CVACH, J DAGORET, S DAINTON, JB DANILOV, M DANN, AWE DAU, WD DAVID, M DEFFUR, E DELCOURT, B DELBUONO, I DEVEL, M DEROECK, A DINEZZA, P DINGUS, P DOLLFUS, C DOWELL, JD DREIS, HB DRESCHER, A DUBOC, J DULLMANN, D DUNGER, O DUHM, H EBBINGHAUS, R EBERLE, M EBERT, J EBERT, TR ECKERLIN, G EFREMENKO, V EGLI, S EHRLICHMANN, H EICHENBERGER, S EICHLER, R EISELE, F EISENHANDLER, E ELLIS, NN ELLISON, RJ ELSEN, E ERDMANN, M EVRARD, E FAVART, L FEDOTOV, A FEEKEN, D FELST, R FELTESSE, J FENSOME, IF FERENCEI, J FERRAROTTO, F FLAMM, K FLAUGER, W FLEISCHER, M FLEISER, M FLUGGE, G FOMENKO, A FOMINYKH, B FORBUSH, M FORMANEK, J FOSTER, JM FRANKE, G FRETWURST, E FUHRMANN, P GABATHULER, E GAMERDINGER, K GARVEY, J GAYLER, J GEBAUER, M GELLRICH, A GENNIS, M GENZEL, H GERHARDS, R GODFREY, LK GOERLACH, U GOERLICH, L GOGITIDZE, N GOLDBERG, M GOLDNER, D GOODALL, AM GORELOV, I GORITCHEV, P GRAB, C GRASSLER, H GRASSLER, R GREENSHAW, T GREIF, H GRINDHAMMER, G GRUBER, A GRUBER, C HAACK, J HAIDT, D HAJDUK, L HAMON, O HAMPEL, M HANLON, EM HAPKE, M HARJES, J HAYDAR, R HAYNES, WJ HEATHERINGTON, J HEDBERG, V HEINZELMANN, G HENDERSON, RCW HENSCHEL, H HERMA, R HERYNEK, J HILDESHEIM, W HILL, P HILTON, CD HLADKY, J HOEGER, KC HOPPNER, M HUET, P HUFNAGEL, H HUOT, N IBBOTSON, M ITTERBECK, H JABIOL, MA JACHOLKOWSKA, A JACOBSSON, C JAFFRE, M JANSEN, T JONSSON, L JOHANNSEN, K JOHNSON, DP JOHNSON, L JUNG, H KALMUS, PIP KANT, D KAZARIAN, S KASCHOWITZ, R KASSELMANN, P KATHAGE, U KAUFMANN, HH KENYON, IR KERMICHE, S KEUKER, C KIESLING, C KLEIN, M KLEINWORT, C KNIES, G KO, W KOHLER, T KOLANOSKI, H KOLE, F KOLYA, SD KORBEL, V KORN, M KOSTKA, P KOTELNIKOV, SK KRASNY, MW KREHBIEL, H KRUCKER, D KRUGER, U KUBENKA, JP KUSTER, H KUHLEN, M KURCA, T KURZHOFER, J KUZNIK, B LACOUR, D LAMARCHE, F LANDER, R LANDON, MPJ LANGE, W LANGKAU, R LANIUS, P LAPORTE, JF LEBEDEV, A LEUSCHNER, A LEVERENZ, C LEVONIAN, S LEWIN, D LEY, C LINDNER, A LINDSTROM, G LINSEL, F LIPINSKI, J LOCH, P LOHMANDER, H LOPEZ, GC LUERS, D LUKE, D MAGNUSSEN, N MALINOVSKI, E MANI, S MARAGE, P MARKS, J MARSHALL, R MARTENS, J MARTIN, R MARTYN, HU MARTYNIAK, J MASSON, S MAVROIDIS, A MAXFIELD, SJ MCMAHON, SJ MEHTA, A MEIER, K MERCER, D MERZ, T MEYER, CA MEYER, H MEYER, J MIKOCKI, S MONNIER, E MOREAU, F MOREELS, J MORRIS, JV MULLER, K MURIN, P MURRAY, SA NAGOVIZIN, V NAROSA, B NAUMANN, T NEWMAN, PR NEWTON, D NEYRET, D NGUYEN, HK NIEBERGALL, F NEIBUHR, C NISIUS, R NOWAK, G NOYES, GW NYBERG, M OBERLACK, H OBROCK, U OLSSON, JE ORENSTEIN, S OULDSAADA, F PASCAUD, C PATEL, GD PEPPEL, E PETERS, S PHILLIPS, HT PHILLIPS, JP PICHLER, C PILGRAM, W PITZL, D PRELL, S PROSI, R RADEL, G RAUPACH, F RAUSCHNABEL, K REIMER, P REINSHAGEN, S RIBARICS, P RIECH, V RIEDLBERGER, J RIESS, S RIETZ, M ROBERTSON, SM ROBMANN, P ROOSEN, R ROSENBAUER, K ROSTOVTSEV, A ROYON, C RUDOWICZ, M RUFFER, M RUSAKOV, S RYBICKI, K SAHLMANN, N SANCHEZ, E SANKEY, DPC SAVITSKY, M SCHACHT, P SCHLEPER, P VONSCHLIPPE, W SCHMIDT, C SCHMIDT, D SCHMITZ, W SCHONING, A SCHRODER, V SCHUHMANN, E SCHULZ, M SCHWAB, B SCHWIND, A SCOBEL, W SEEHAUSEN, U SELL, R SEMENOV, A SHEKELYAHN, V SHEVIAKOV, I SHOOSHTARI, H SHTARKOV, LN SIEGMON, G SIEWERT, U SIROIS, Y SKILLICORN, IO SMIRNOV, P SMITH, JR SOLOVIEV, Y SPITZER, H STEENBOCK, M STEFFEN, P STEINBERG, R STELLA, B STEPHENS, K STIER, J STOSSLEIN, U STRACHOTA, J STRAUMANN, U STRUCZINSKI, W SUTTON, JP TAYLOR, RE TCHERNYSHOV, V THIEBAUX, C THOMPSON, G TICHOMIROV, I TRUOL, P TURNAU, J TUTAS, J URBAN, L USIK, A VALKAR, S VALKAROVA, A VALLEE, C VANESCH, P VARTAPETIAN, A VAZDIK, Y VECKO, M VERRECCHIA, P VICK, R VILLET, G VOGEL, E WACKER, K WALKER, IW WALTHER, A WEBER, G WEGENER, D WEGNER, A WELLISCH, HP WEST, LR WILLARD, S WINDE, M WINTER, GG WOLFF, T WOMERSLEY, LA WRIGHT, AE WULFF, N YIOU, TP ZACEK, J ZEITNITZ, C ZIAEEPOUR, H ZIMMER, M ZIMMERMANN, W ZOMER, F AF ABT, I AHMED, T ANDREEV, V AID, S ANDRIEU, B APPUHN, RD ARPAGAUS, M BABAEV, A BARWOLFF, H BAIN, J BARANOV, P BARRELET, E BARTEL, W BASSLER, U BECK, HP BEHREND, HJ BELOUSOV, A BERGER, C BERGSTEIN, H BERNARDI, G BERNET, R BERTRANDCOREMANS, G BESACON, M BIDDDULPH, P BINDER, E BIZOT, JC BLOBEL, V BORRAS, K BOSETTI, PC BOUDRY, V BOURDARIOUS, C BRAEMER, A BRASSE, F BRAUN, U BRAUNSCHWEIG, W BRISSON, V BRUNDKO, D BUNGENER, L BURGER, J BUSSER, FW BUNIATIAN, A BURKE, S BUSCHHORN, G CAMPBELL, AJ CARLI, T CHARLES, F CYYLA, J CLARKE, D CLEGG, AB COLOMBO, M COUGLAN, JA COURAU, A COUTURES, C COZZIKA, G CRIEGEE, L CVACH, J DAGORET, S DAINTON, JB DANILOV, M DANN, AWE DAU, WD DAVID, M DEFFUR, E DELCOURT, B DELBUONO, I DEVEL, M DEROECK, A DINEZZA, P DINGUS, P DOLLFUS, C DOWELL, JD DREIS, HB DRESCHER, A DUBOC, J DULLMANN, D DUNGER, O DUHM, H EBBINGHAUS, R EBERLE, M EBERT, J EBERT, TR ECKERLIN, G EFREMENKO, V EGLI, S EHRLICHMANN, H EICHENBERGER, S EICHLER, R EISELE, F EISENHANDLER, E ELLIS, NN ELLISON, RJ ELSEN, E ERDMANN, M EVRARD, E FAVART, L FEDOTOV, A FEEKEN, D FELST, R FELTESSE, J FENSOME, IF FERENCEI, J FERRAROTTO, F FLAMM, K FLAUGER, W FLEISCHER, M FLEISER, M FLUGGE, G FOMENKO, A FOMINYKH, B FORBUSH, M FORMANEK, J FOSTER, JM FRANKE, G FRETWURST, E FUHRMANN, P GABATHULER, E GAMERDINGER, K GARVEY, J GAYLER, J GEBAUER, M GELLRICH, A GENNIS, M GENZEL, H GERHARDS, R GODFREY, LK GOERLACH, U GOERLICH, L GOGITIDZE, N GOLDBERG, M GOLDNER, D GOODALL, AM GORELOV, I GORITCHEV, P GRAB, C GRASSLER, H GRASSLER, R GREENSHAW, T GREIF, H GRINDHAMMER, G GRUBER, A GRUBER, C HAACK, J HAIDT, D HAJDUK, L HAMON, O HAMPEL, M HANLON, EM HAPKE, M HARJES, J HAYDAR, R HAYNES, WJ HEATHERINGTON, J HEDBERG, V HEINZELMANN, G HENDERSON, RCW HENSCHEL, H HERMA, R HERYNEK, J HILDESHEIM, W HILL, P HILTON, CD HLADKY, J HOEGER, KC HOPPNER, M HUET, P HUFNAGEL, H HUOT, N IBBOTSON, M ITTERBECK, H JABIOL, MA JACHOLKOWSKA, A JACOBSSON, C JAFFRE, M JANSEN, T JONSSON, L JOHANNSEN, K JOHNSON, DP JOHNSON, L JUNG, H KALMUS, PIP KANT, D KAZARIAN, S KASCHOWITZ, R KASSELMANN, P KATHAGE, U KAUFMANN, HH KENYON, IR KERMICHE, S KEUKER, C KIESLING, C KLEIN, M KLEINWORT, C KNIES, G KO, W KOHLER, T KOLANOSKI, H KOLE, F KOLYA, SD KORBEL, V KORN, M KOSTKA, P KOTELNIKOV, SK KRASNY, MW KREHBIEL, H KRUCKER, D KRUGER, U KUBENKA, JP KUSTER, H KUHLEN, M KURCA, T KURZHOFER, J KUZNIK, B LACOUR, D LAMARCHE, F LANDER, R LANDON, MPJ LANGE, W LANGKAU, R LANIUS, P LAPORTE, JF LEBEDEV, A LEUSCHNER, A LEVERENZ, C LEVONIAN, S LEWIN, D LEY, C LINDNER, A LINDSTROM, G LINSEL, F LIPINSKI, J LOCH, P LOHMANDER, H LOPEZ, GC LUERS, D LUKE, D MAGNUSSEN, N MALINOVSKI, E MANI, S MARAGE, P MARKS, J MARSHALL, R MARTENS, J MARTIN, R MARTYN, HU MARTYNIAK, J MASSON, S MAVROIDIS, A MAXFIELD, SJ MCMAHON, SJ MEHTA, A MEIER, K MERCER, D MERZ, T MEYER, CA MEYER, H MEYER, J MIKOCKI, S MONNIER, E MOREAU, F MOREELS, J MORRIS, JV MULLER, K MURIN, P MURRAY, SA NAGOVIZIN, V NAROSA, B NAUMANN, T NEWMAN, PR NEWTON, D NEYRET, D NGUYEN, HK NIEBERGALL, F NEIBUHR, C NISIUS, R NOWAK, G NOYES, GW NYBERG, M OBERLACK, H OBROCK, U OLSSON, JE ORENSTEIN, S OULDSAADA, F PASCAUD, C PATEL, GD PEPPEL, E PETERS, S PHILLIPS, HT PHILLIPS, JP PICHLER, C PILGRAM, W PITZL, D PRELL, S PROSI, R RADEL, G RAUPACH, F RAUSCHNABEL, K REIMER, P REINSHAGEN, S RIBARICS, P RIECH, V RIEDLBERGER, J RIESS, S RIETZ, M ROBERTSON, SM ROBMANN, P ROOSEN, R ROSENBAUER, K ROSTOVTSEV, A ROYON, C RUDOWICZ, M RUFFER, M RUSAKOV, S RYBICKI, K SAHLMANN, N SANCHEZ, E SANKEY, DPC SAVITSKY, M SCHACHT, P SCHLEPER, P VONSCHLIPPE, W SCHMIDT, C SCHMIDT, D SCHMITZ, W SCHONING, A SCHRODER, V SCHUHMANN, E SCHULZ, M SCHWAB, B SCHWIND, A SCOBEL, W SEEHAUSEN, U SELL, R SEMENOV, A SHEKELYAHN, V SHEVIAKOV, I SHOOSHTARI, H SHTARKOV, LN SIEGMON, G SIEWERT, U SIROIS, Y SKILLICORN, IO SMIRNOV, P SMITH, JR SOLOVIEV, Y SPITZER, H STEENBOCK, M STEFFEN, P STEINBERG, R STELLA, B STEPHENS, K STIER, J STOSSLEIN, U STRACHOTA, J STRAUMANN, U STRUCZINSKI, W SUTTON, JP TAYLOR, RE TCHERNYSHOV, V THIEBAUX, C THOMPSON, G TICHOMIROV, I TRUOL, P TURNAU, J TUTAS, J URBAN, L USIK, A VALKAR, S VALKAROVA, A VALLEE, C VANESCH, P VARTAPETIAN, A VAZDIK, Y VECKO, M VERRECCHIA, P VICK, R VILLET, G VOGEL, E WACKER, K WALKER, IW WALTHER, A WEBER, G WEGENER, D WEGNER, A WELLISCH, HP WEST, LR WILLARD, S WINDE, M WINTER, GG WOLFF, T WOMERSLEY, LA WRIGHT, AE WULFF, N YIOU, TP ZACEK, J ZEITNITZ, C ZIAEEPOUR, H ZIMMER, M ZIMMERMANN, W ZOMER, F TI INCLUSIVE CHARGED-PARTICLE CROSS-SECTIONS IN PHOTOPRODUCTION AT HERA SO PHYSICS LETTERS B LA English DT Article ID MULTIWIRE PROPORTIONAL CHAMBER; LUND MONTE-CARLO; PARTON FRAGMENTATION; HARD SCATTERING; DISTRIBUTIONS AB Cross sections are presented for the inclusive production of charged particles measured in electron-proton collisions at low Q2 with the H1 detector at HERA. The transverse momentum distribution extends up to 8 GeV/c. Its shape is found to be harder than that observed in ppBAR collisions at comparable centre-of-mass energies square-root s(gammap) almost-equal-to square-root s(ppBAR) almost-equal-to 200 GeV, and also harder than in gammap collisions at lower energies square-root s(gammap) almost-equal-to 18 GeV. Results from quantum chromodynamics (QCD) calculations agree with the measured transverse momentum and pseudorapidity cross sections. C1 UNIV CALIF DAVIS,IIRPA,DAVIS,CA 95616. RHEIN WESTFAL TH AACHEN,INST PHYS 1,W-5100 AACHEN,GERMANY. RHEIN WESTFAL TH AACHEN,INST PHYS 3,W-5100 AACHEN,GERMANY. VUB,ULB,INTER UNIV INST HIGH ENERGIES,BRUSSELS,BELGIUM. UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. UNIV DORTMUND,INST PHYS,W-4600 DORTMUND 50,GERMANY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. DESY,W-2000 HAMBURG 52,GERMANY. UNIV HAMBURG,INST EXPTL PHYS 1,W-2000 HAMBURG 13,GERMANY. UNIV HAMBURG,INST EXPTL PHYS 2,W-2000 HAMBURG 13,GERMANY. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY. CHRISTIAN ALBRECHTS UNIV KIEL,INST REINE & ANGEW KERNPHYS,W-2300 KIEL 1,GERMANY. SLOVAK ACAD SCI,INST EXPTL PHYS,KOSICE,SLOVAKIA. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YL,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. QUEEN MARY & WESTFIELD COLL,LONDON,ENGLAND. LUND UNIV,DEPT PHYS,S-22101 LUND,SWEDEN. UNIV MANCHESTER,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA. PN LEBEDEV PHYS INST,MOSCOW,RUSSIA. MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY. UNIV PARIS 11,LAL,IN2P3,CNRS,F-91405 ORSAY,FRANCE. ECOLE POLYTECH,LPNHE,IN2P3,CNRS,F-91128 PALAISEAU,FRANCE. UNIV PARIS 06,LPNHE,PARIS,FRANCE. UNIV PARIS 07,IN2P3,CNRS,F-75221 PARIS 05,FRANCE. CZECHOSLOVAK ACAD SCI,INST PHYS,CS-11142 PRAGUE 1,CZECH REPUBLIC. CHARLES UNIV,CTR NUCL,PRAGUE,CZECH REPUBLIC. INFN,ROME,ITALY. UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS,I-00185 ROME,ITALY. BERG UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,WUPPERTAL,GERMANY. DESY,INST HOCHENERGIEPHYS,ZEUTHEN,GERMANY. SWISS FED INST TECHNOL,INST HOCHENERGIEPHYS,CH-8092 ZURICH,SWITZERLAND. UNIV ZURICH,INST PHYS,CH-8006 ZURICH,SWITZERLAND. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. CTR ETUD SACLAY,DAPNIA,GIF SUR YVETTE,FRANCE. RP ABT, I (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI Danilov, Mikhail/C-5380-2014; Kotelnikov, Sergey/A-9711-2014; Cvach, Jaroslav/G-6269-2014; Sheviakov, Igor/N-2735-2015; DEVEL, Michel/A-5677-2009; Meyer, Curtis/L-3488-2014; Levonian, Sergey/M-8693-2015; Soloviev, Yury/M-8788-2015; Andreev, Vladimir/M-8665-2015; Fomenko, Alexander/I-7900-2014; Malinovski, Evgenii/N-1034-2015; Gogitidze, Nelli/N-1224-2015; Belousov, Anatoli/N-2102-2015; Vazdik, Iakov/N-2624-2015; Gorelov, Igor/J-9010-2015 OI Danilov, Mikhail/0000-0001-9227-5164; Kotelnikov, Sergey/0000-0002-8027-4612; Beck, Hans Peter/0000-0001-7212-1096; Bassler, Ursula/0000-0002-9041-3057; Sheviakov, Igor/0000-0002-1659-3483; DEVEL, Michel/0000-0001-8785-6896; Meyer, Curtis/0000-0001-7599-3973; Soloviev, Yury/0000-0003-1136-2827; Gorelov, Igor/0000-0001-5570-0133 NR 36 TC 35 Z9 35 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 26 PY 1994 VL 328 IS 1-2 BP 176 EP 186 DI 10.1016/0370-2693(94)90448-0 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP351 UT WOS:A1994NP35100031 ER PT J AU FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VIOLA, L VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY AF FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VIOLA, L VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI 1ST OBSERVATION OF THE SIGMA-PI+PI+ DECAY MODE OF THE LAMBDA-C BARYON AND ITS BRANCHING RATIO RELATIVE TO THE SIGMA+PI+PI- MODE SO PHYSICS LETTERS B LA English DT Article ID PERFORMANCE AB We report the first observation (103 +/- 17 events) of the decay LAMBDA(c)+ --> SIGMA-pi+pi+ and the charge conjugate. A measurement of the relative branching ratio GAMMA(LAMBDA(c)+ --> SIGMA-pi+pi+)/GAMMA(LAMBDA(c)+ --> SIGMA+pi+pi-) = 0.53 +/- 0.15 (stat) +/- 0.07 (sys) is also presented. C1 INFN,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR,I-27100 PAVIA,ITALY. INFN,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV S CAROLINA,COLUMBIA,SC 29208. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV N CAROLINA,ASHEVILLE,NC 28804. UNIV TENNESSEE,KNOXVILLE,TN 37996. KOREA UNIV,SEOUL 136701,SOUTH KOREA. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 12 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 26 PY 1994 VL 328 IS 1-2 BP 193 EP 198 DI 10.1016/0370-2693(94)90450-2 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP351 UT WOS:A1994NP35100033 ER PT J AU ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ALKHAZOV, G ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A BYKOV, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLO, R CAVALLO, N CERRADA, M CESARONI, F CHAMIZO, M CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, J CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F DELACRUZ, B CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FANDRINI, E FIELD, JYH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, DE GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HOU, SR HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KUIJTEN, H KUMAR, KS KUNIN, A DEGUEVARA, PL LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, W LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALGERI, L MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULELR, S NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S ROBOHM, A RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANCHYEZ, E SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHNOLZ, N SCHOPPER, Y SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SOIN, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, MN STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TING, SCC TING, SM TOKER, O TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL TUUVA, T ULBGRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, CR WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ACCIARRI, M ADAM, A ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELESCU, T ANTONOV, L ANTREASYAN, D ALKHAZOV, G ARCE, P AREFIEV, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BANICZ, K BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BRIGLJEVIC, V BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BURGOS, C BUSENITZ, J BUYTENHUIJS, A BYKOV, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASAUS, J CASTELLO, R CAVALLO, N CERRADA, M CESARONI, F CHAMIZO, M CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, G CHEN, GM CHEN, HF CHEN, HS CHEN, M CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, J CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A COSTANTINI, S COTOROBAI, F DELACRUZ, B CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DITTMAR, M DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FAVARA, A FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FANDRINI, E FIELD, JYH FILTHAUT, F FISHER, PH FORCONI, G FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GENTILE, S GHEORDANESCU, N GIAGU, S GOLDFARB, S GONG, ZF GONZALEZ, DE GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERVE, A HILGERS, K HOFER, H HOORANI, H HOU, SR HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JIN, BN JONES, LW JOSAMUTUBERRIA, I KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KUIJTEN, H KUMAR, KS KUNIN, A DEGUEVARA, PL LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEE, JS LEE, KY LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEVTCHENKO, P LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, W LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALGERI, L MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, M METZGER, WJ MI, Y MIHUL, A MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULELR, S NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PINTO, JC PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REDAELLI, M REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RO, S ROBOHM, A RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANCHYEZ, E SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHNOLZ, N SCHOPPER, Y SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SOIN, D SOPCZAK, A SOULIMOV, V SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, MN STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TING, SCC TING, SM TOKER, O TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL TUUVA, T ULBGRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, JC WANG, CR WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI MEASUREMENT OF INCLUSIVE PRODUCTION OF NEUTRAL HADRONS FROM Z-DECAYS SO PHYSICS LETTERS B LA English DT Article ID E+ E ANNIHILATION; LUND MONTE-CARLO; JET FRAGMENTATION; PHOTON PRODUCTION; PERTURBATIVE QCD; MESON PRODUCTION; ETA-PRODUCTION; L3 EXPERIMENT; SOFT GLUONS; SPECTRA AB We present a study of the inclusive production of pi0, eta, K(s)0 and LAMBDA based on 929,000 hadronic Z decays recorded with the L3 detector at LEP. The measured inclusive momentum distributions have been compared with predictions from parton shower models as well as an analytical Quantum Chromodynamics calculation. Comparing to low energy e+e- data, we find that QCD describes the energy evolution of the hadron spectrum. C1 INFN, SE2 MILANO, I-20133 MILAN, ITALY. RHEIN WESTFAL TH AACHEN, INST PHYS 131, D-52056 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. LAPP, IN2P3, CNRS, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA. UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUCHAREST 114, ROMANIA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. SEFT, HIGH ENERGY PHYS RES INST, SF-00014 HELSINKI, FINLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, IN2P3, CNRS, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW, RUSSIA. INFN, SEZ NAPOLI, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEK, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. INFN, SEZ ROMA, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. INFN, SEZ PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULARS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, D-15738 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. RI Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012; Cerrada, Marcos/J-6934-2014; de la Cruz, Begona/K-7552-2014; Josa, Isabel/K-5184-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Sanchez, Eusebio/H-5228-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Tsaregorodtsev, Andrei/E-3873-2016; OI Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247 NR 40 TC 46 Z9 46 U1 3 U2 8 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 26 PY 1994 VL 328 IS 1-2 BP 223 EP 233 DI 10.1016/0370-2693(94)90453-7 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP351 UT WOS:A1994NP35100036 ER PT J AU ABDURASHITOV, JN FAIZOV, EL GAVRIN, VN GUSEV, AO KALIKHOV, AV KNODEL, TV KNYUSHENKO, II KORNOUKHOV, VN MIRMOV, IN PSHUKOV, AM SHALAGIN, AM SHIKHIN, AA TIMOFEYEV, PV VERETENKIN, EP VERMUL, VKM ZATSEPIN, GT BOWLES, TJ NICO, JS TEASDALE, WA WARK, DL WILKERSON, JF CLEVELAND, BT DAILY, T DAVIS, R LANDE, K LEE, CK WILDENHAIN, PW ELLIOTT, SR CHERRY, ML KOUZES, RT AF ABDURASHITOV, JN FAIZOV, EL GAVRIN, VN GUSEV, AO KALIKHOV, AV KNODEL, TV KNYUSHENKO, II KORNOUKHOV, VN MIRMOV, IN PSHUKOV, AM SHALAGIN, AM SHIKHIN, AA TIMOFEYEV, PV VERETENKIN, EP VERMUL, VKM ZATSEPIN, GT BOWLES, TJ NICO, JS TEASDALE, WA WARK, DL WILKERSON, JF CLEVELAND, BT DAILY, T DAVIS, R LANDE, K LEE, CK WILDENHAIN, PW ELLIOTT, SR CHERRY, ML KOUZES, RT TI RESULTS FROM SAGE (THE RUSSIAN-AMERICAN GALLIUM SOLAR-NEUTRINO EXPERIMENT) SO PHYSICS LETTERS B LA English DT Article ID REAL-TIME; UNCERTAINTIES; GALLEX; MODEL; SUN AB Fifteen measurements of the solar neutrino flux have been made in a radiochemical Ga-71-Ge-71 experiment employing initially 30 t and later 57 t of liquid metallic gallium at the Baksan Neutrino Observatory between January 1990 and May 1992. This provides an integral measurement of the flux of solar neutrinos and in particular is sensitive to the dominant, low-energy p-p solar neutrinos. SAGE observed the capture rate to be 73(+18/-16) (stat.)(+5/-7) (syst.) SNU. This represents only 56%-60% of the capture rate predicted by different Standard Solar Models. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV PENN, PHILADELPHIA, PA 19104 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOUISIANA STATE UNIV, BATON ROUGE, LA 70803 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. RP ABDURASHITOV, JN (reprint author), RUSSIAN ACAD SCI, INST NUCL RES, MOSCOW 117312, RUSSIA. RI Abdurashitov, Dzhonrid/B-2206-2014; OI Abdurashitov, Dzhonrid/0000-0002-1577-1364; Wilkerson, John/0000-0002-0342-0217 NR 31 TC 356 Z9 356 U1 0 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 26 PY 1994 VL 328 IS 1-2 BP 234 EP 248 DI 10.1016/0370-2693(94)90454-5 PG 15 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP351 UT WOS:A1994NP35100037 ER PT J AU ISTRAIL, S ZIVKOVIC, D AF ISTRAIL, S ZIVKOVIC, D TI BOUNDED-WIDTH POLYNOMIAL-SIZE BOOLEAN-FORMULAS COMPUTE EXACTLY THOSE FUNCTIONS IN AC(0) SO INFORMATION PROCESSING LETTERS LA English DT Article DE COMPUTATIONAL COMPLEXITY; BOOLEAN FUNCTIONS; CIRCUIT COMPLEXITY AB We show that the complexity classes AC0 and NC1 consist exactly of, respectively, constant and 0(log n) width polynomial-size Boolean formulas. C1 SAVANNAH STATE COLL,DEPT MATH & COMP SCI,SAVANNAH,GA 31404. RP ISTRAIL, S (reprint author), SANDIA NATL LABS,DEPT 1423,ALBUQUERQUE,NM 87185, USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0020-0190 J9 INFORM PROCESS LETT JI Inf. Process. Lett. PD MAY 25 PY 1994 VL 50 IS 4 BP 211 EP 216 DI 10.1016/0020-0190(94)00036-0 PG 6 WC Computer Science, Information Systems SC Computer Science GA NP519 UT WOS:A1994NP51900007 ER PT J AU ARVIDSON, DN ARVIDSON, CG LAWSON, CL MINER, J ADAMS, C YOUDERIAN, P AF ARVIDSON, DN ARVIDSON, CG LAWSON, CL MINER, J ADAMS, C YOUDERIAN, P TI THE TRYPTOPHAN REPRESSOR SEQUENCE IS HIGHLY CONSERVED AMONG THE ENTEROBACTERIACEAE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID ESCHERICHIA-COLI K-12; SOLUBLE LYTIC TRANSGLYCOSYLASE; TRP-REPRESSOR; NUCLEOTIDE-SEQUENCE; AMINO-ACID; STRUCTURAL GENE; SALMONELLA-TYPHIMURIUM; SERRATIA-MARCESCENS; REGULATORY REGION; CRYSTAL-STRUCTURE AB Tryptophan biosynthesis in Escherichia coli is regulated by the product of the trpR gene, the tryptophan (Trp) repressor. Trp aporepressor binds the corepressor, L-tryptophan, to form a holorepressor complex, which binds trp operator DNA tightly, and inhibits transcription of the tryptophan biosynthetic operon. The conservation of trp operator sequences among enteric Gram-negative bacteria suggests that trpR genes from other bacterial species can be cloned by complementation in E. coli. To clone trpR homologues, a deletion of the E. coli trpR gene, Delta trpR504, was made on a plasmid by site-directed mutagenesis, then crossed onto the E. coli genome. Plasmid clones of the trpR genes of Enterobacter aerogenes and Enterobacter cloacae were isolated by complementation of the Delta trpR504 allele, scored as the ability to repress beta-galactosidase synthesis from a prophage-borne trpE- lacZ gene fusion. The predicted amino acid sequences of four enteric TrpR proteins show differences, clustered on the backside of the folded repressor, opposite the DNA-binding helix-turn-helix substructures. These differences are predicted to have little effect on the interactions of the aporepressor with tryptophan, holorepressor with operator DNA, or tandemly bound holorepressor dimers with one another. Although there is some variation observed at the dimer interface, interactions predicted to stabilize the interface are conserved. The phylogenetic relationships revealed by the TrpR amino acid sequence alignment agree with the results of others. C1 OREGON HLTH SCI UNIV,DEPT MICROBIOL & IMMUNOL,PORTLAND,OR 97201. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP ARVIDSON, DN (reprint author), CALIF INST BIOL RES,11099 N TORREY PINES RD,LA JOLLA,CA 92037, USA. FU NIGMS NIH HHS [GM12629, GM34150] NR 88 TC 11 Z9 16 U1 1 U2 3 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAY 25 PY 1994 VL 22 IS 10 BP 1821 EP 1829 DI 10.1093/nar/22.10.1821 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NQ605 UT WOS:A1994NQ60500006 PM 8208606 ER PT J AU CHOQUETTE, KD LEAR, KL LEIBENGUTH, RE ASOM, MT AF CHOQUETTE, KD LEAR, KL LEIBENGUTH, RE ASOM, MT TI POLARIZATION MODULATION OF CRUCIFORM VERTICAL-CAVITY LASER-DIODES SO APPLIED PHYSICS LETTERS LA English DT Article ID SURFACE-EMITTING LASERS AB We demonstrate electrical switching and modulation between two orthogonal polarization modes of air-post vertical-cavity surface emitting lasers with cruciform transverse cavity geometry. The continuous-wave lasing emission is switched from one polarization mode to the orthogonal mode at frequencies up to 50 MHz by a small signal modulation of the injection current. Furthermore, a polarized output signal at twice the input frequency is generated at frequencies up to 10 MHz by a large signal modulation of the injection current from below threshold to above the polarization switching transition. C1 AT&T BELL LABS,STC,BREINIGSVILLE,PA 18031. RP CHOQUETTE, KD (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 83 Z9 83 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 23 PY 1994 VL 64 IS 21 BP 2767 EP 2769 DI 10.1063/1.111464 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100003 ER PT J AU WRAY, JE LIU, KC CHEN, CH GARRETT, WR PAYNE, MG GOEDERT, R TEMPLETON, D AF WRAY, JE LIU, KC CHEN, CH GARRETT, WR PAYNE, MG GOEDERT, R TEMPLETON, D TI OPTICAL POWER LIMITING OF FULLERENES SO APPLIED PHYSICS LETTERS LA English DT Article ID ABSORPTION; C-60; C-70 AB Optical power limiting processes in C60 solutions have been measured in a double-pass geometry designed to produce high beam attenuation. Based on the concentration of C60 and measured attenuation of laser fluence, it was found that, at high intensities, more than 100 visible (532 nm) photons per C60 molecule can be absorbed during a single 7-nanosecond laser pulse. The requisite features of such efficacious attenuation mechanisms are briefly discussed and a model meeting the requirements is described. C1 USA,TANK AUTOMOT COMMAND,WARREN,MI 48397. RP WRAY, JE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 12 TC 38 Z9 39 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 23 PY 1994 VL 64 IS 21 BP 2785 EP 2787 DI 10.1063/1.111470 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100009 ER PT J AU UCHIDA, K YU, PY NOTO, N WEBER, ER AF UCHIDA, K YU, PY NOTO, N WEBER, ER TI PRESSURE-INDUCED GAMMA-X CROSSOVER IN THE CONDUCTION-BAND OF ORDERED AND DISORDERED GAINP ALLOYS SO APPLIED PHYSICS LETTERS LA English DT Article ID VAPOR-PHASE EPITAXY; SEMICONDUCTOR ALLOYS; GROWTH TEMPERATURE; GA0.5IN0.5P; PHOTOLUMINESCENCE; GAAS; ELECTROREFLECTANCE; GA0.52IN0.48P; OPERATION; LASER AB Pressure-dependent photoluminescence in both ordered and disordered Ga0.5In0.5P is reported. In ordered Ga0.5In0.5P, emissions are observed from both the direct band gap at the Brillouin zone center (GAMMA) and from the indirect band gap involving the conduction band at the X point of the Brillouin zone. The conduction-band minima at X and GAMMA in the ordered phase are found to be lowered in energy by the same amount with respect to those in the disordered phase. Our results support the existence of ordering along the [001] direction in GaInP as proposed recently by Kurtz. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT PHYS,BERKELEY,CA 94720. SHIN ETSU HANDOUTAI CO,ISOBE SEMICOND LAB,ISOBE AN NAKA,GUNMA,JAPAN. NR 20 TC 22 Z9 22 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 23 PY 1994 VL 64 IS 21 BP 2858 EP 2860 DI 10.1063/1.111449 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100034 ER PT J AU BOTKIN, D WEISS, S SUCHA, G CHEMLA, DS WIESENFELD, JM AF BOTKIN, D WEISS, S SUCHA, G CHEMLA, DS WIESENFELD, JM TI ULTRAFAST DYNAMICS OF THE OPTICAL-MODE OF A 1.5-MU-M MULTIPLE-QUANTUM-WELL OPTICAL AMPLIFIER SO APPLIED PHYSICS LETTERS LA English DT Article ID FEMTOSECOND GAIN DYNAMICS; LASERS; NONLINEARITIES; MODULATION; INDEX AB Time-resolved measurements of the mode profile of semiconductor multiple quantum well amplifiers reveal ultrafast dynamic changes which contribute to the nonlinear gain of such devices. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. AT&T BELL LABS,HOLMDEL,NJ 07733. RP BOTKIN, D (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI weiss, shimon/B-4164-2009 OI weiss, shimon/0000-0002-0720-5426 NR 16 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 23 PY 1994 VL 64 IS 21 BP 2861 EP 2863 DI 10.1063/1.111450 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100035 ER PT J AU AHRENKIEL, RK KEYES, BM LEVI, DL EMERY, K CHU, TL CHU, SS AF AHRENKIEL, RK KEYES, BM LEVI, DL EMERY, K CHU, TL CHU, SS TI SPATIAL UNIFORMITY OF MINORITY-CARRIER LIFETIME IN POLYCRYSTALLINE CDTE SOLAR-CELLS SO APPLIED PHYSICS LETTERS LA English DT Article AB Time-resolved photoluminescence was used to map recombination lifetimes in polycrystalline CdS/CdTe solar cells. Typical lifetime profiles indicated spatial variation by factors of 2-3 across 1 cm dimensions. Correlated device efficiency measurements indicated that spatial regions of lifetime minima dominated the open-circuit voltage. C1 TING CHU & ASSOCIATES,DALLAS,TX 75225. RP AHRENKIEL, RK (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 15 TC 26 Z9 27 U1 1 U2 10 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 23 PY 1994 VL 64 IS 21 BP 2879 EP 2881 DI 10.1063/1.111402 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100041 ER PT J AU MADER, KA ZUNGER, A AF MADER, KA ZUNGER, A TI EFFECTS OF ATOMIC CLUSTERING ON THE OPTICAL-PROPERTIES OF III-V ALLOYS SO APPLIED PHYSICS LETTERS LA English DT Article ID SPECIAL-QUASIRANDOM-STRUCTURES; SEMICONDUCTOR ALLOYS; ELECTRONIC-STRUCTURE; RANDOM AL0.5GA0.5AS; RAY SCATTERING; DIFFUSE-X; ALXGA1-XAS; GAXIN1-XP; DENSITY; STATES AB Self-consistent electronic structure calculations together with a structural model are used to study the effect of short-range atomic order on the optical properties of otherwise random Al0.5Ga0.5As, Ga0.5In0.5P, and Al0.5In0.5As alloys. We find that clustering can reduce the direct band gap of these alloys by as much as 100 meV Furthermore, sufficiently strong clustering is predicted to transform Al0.5Ga0.5As into a direct gap material. RP MADER, KA (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 27 TC 39 Z9 39 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 23 PY 1994 VL 64 IS 21 BP 2882 EP 2884 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100042 ER PT J AU THUNDAT, T WARMACK, RJ CHEN, GY ALLISON, DP AF THUNDAT, T WARMACK, RJ CHEN, GY ALLISON, DP TI THERMAL AND AMBIENT-INDUCED DEFLECTIONS OF SCANNING FORCE MICROSCOPE CANTILEVERS SO APPLIED PHYSICS LETTERS LA English DT Article AB The deflection of scanning force microscope cantilevers, metal coated on one side, is significantly influenced by both thermal heating and variations in relative humidity. For constant relative humidity, the deflection of the cantilever drifts due to laser heating and eventually reaches a steady-state value. For a thermally stabilized cantilever, the deflection varies linearly with relative humidity. Exposure to other vapors, such as mercury, changes the inherent deflection of the cantilever. Relative amounts of adsorbates on the cantilever can be estimated from shifts in the cantilever resonance frequency with picogram mass resolution. The cantilever deflection as well as changes in resonance frequency due to vapor adsorption can be used as basis for novel chemical sensors. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 18 TC 320 Z9 330 U1 2 U2 29 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 23 PY 1994 VL 64 IS 21 BP 2894 EP 2896 DI 10.1063/1.111407 PG 3 WC Physics, Applied SC Physics GA NN011 UT WOS:A1994NN01100046 ER PT J AU KREMER, M POTHMANN, E ROSSLER, T BAKER, J YEE, A BLANCH, H PRAUSNITZ, JM AF KREMER, M POTHMANN, E ROSSLER, T BAKER, J YEE, A BLANCH, H PRAUSNITZ, JM TI PORE-SIZE DISTRIBUTIONS OF CATIONIC POLYACRYLAMIDE HYDROGELS VARYING IN INITIAL MONOMER CONCENTRATION AND CROSS-LINKER - MONOMER RATIO SO MACROMOLECULES LA English DT Article ID GEL-PERMEATION CHROMATOGRAPHY; SWELLING EQUILIBRIA; INTEGRAL-EQUATIONS AB Pore-size distributions have been measured for cationic acrylamide-based hydrogels. We use the experimental mixed-solute-exclusion method, MSE (introduced by Kuga), to obtain the solute-exclusion curve representing the amount of imbibed liquid inside the gel inaccessible for a solute of radius r. We use the Brownian motion model (developed by Cassasa) to convert the size-exclusion curve into the pore-size distribution, which gives the frequency of pore radius R as a function of R. This theoretically-based interpretation of MSE data leads to the Fredholm integral equation that we solve numerically. Results are reported for a series of hydrogels containing acrylamide and 3% MAPTAC; the hydrogels differed in extent of cross-linking and/or initial concentration of monomer. Pore-size distributions shift to lower pore sizes with rising initial monomer concentration and with rising cross-linker-to-monomer ratio. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM ENGN,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DIV CHEM SCI,LIVERMORE,CA 94550. NR 29 TC 29 Z9 29 U1 1 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 23 PY 1994 VL 27 IS 11 BP 2965 EP 2973 DI 10.1021/ma00089a012 PG 9 WC Polymer Science SC Polymer Science GA NP311 UT WOS:A1994NP31100012 ER PT J AU KRIEGER, SJ BONCHE, P FLOCARD, H HEENEN, PH WEISS, MS AF KRIEGER, SJ BONCHE, P FLOCARD, H HEENEN, PH WEISS, MS TI GCM CALCULATION OF THE E2 DECAY LIFETIMES OF SHAPE ISOMERS SO NUCLEAR PHYSICS A LA English DT Article ID GENERATOR-COORDINATE METHOD; HARTREE-FOCK; NUCLEI; FISSION; U-238; SUPERDEFORMATION; DEFORMATIONS; TRANSITION; ISOTOPES; TH-232 AB We apply the generator coordinate method (GCM) in a fully microscopic calculation of the E2 decay lifetime of the isomeric states of U-238, Th-230 and Th-232. The basis states have been generated by constrained HFBCS calculations with the potential SkM*. Triaxial quadrupole deformations have been included. Comparison is made with experiment in the case of U-238 and experimenters are urged to search for the predicted decays in the thorium isotopes. C1 ULB,SERV PHYS NUCL THEOR,B-1050 BRUSSELS,BELGIUM. UNIV PARIS 11,IPN,DIV PHYS THEOR,CNRS,F-91406 ORSAY,FRANCE. UNIV PARIS 06,IPN,DIV PHYS,CNRS,F-91406 ORSAY,FRANCE. RP KRIEGER, SJ (reprint author), LLNL,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 37 TC 11 Z9 11 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 23 PY 1994 VL 572 IS 2 BP 384 EP 400 DI 10.1016/0375-9474(94)90181-3 PG 17 WC Physics, Nuclear SC Physics GA NN280 UT WOS:A1994NN28000008 ER PT J AU RANDRUP, J AYIK, S AF RANDRUP, J AYIK, S TI SIMPLIFIED NUCLEAR BOLTZMANN-LANGEVIN SIMULATION SO NUCLEAR PHYSICS A LA English DT Article ID HEAVY-ION COLLISIONS; ONE-BODY DYNAMICS; TRANSPORT-THEORY; 2-BODY COLLISIONS; FLUCTUATIONS; MULTIFRAGMENTATION; FRAGMENTATION; INSTABILITY; MATTER; MODEL AB Within the framework of the Fokker-Planck formulation of the nuclear Boltzmann-Langevin theory, we derive simple analytical expressions for the transport coefficients that are accurate for small temperatures and near equilibrium. The numerical effort associated with solving the BL equation for the nucleon phase-space density f can then be reduced by orders of magnitude, by picking the stochastic changes in f on the basis of the transport coefficients, rather than by simulating the basic two-particle-two-hole processes as previously done. The proposed method is illustrated for a maximally simple BL model applied to the equilibration in a Fermi-Dirac gas. C1 TENNESSEE TECHNOL UNIV, DEPT PHYS, COOKEVILLE, TN 38505 USA. RP RANDRUP, J (reprint author), LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. NR 36 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 23 PY 1994 VL 572 IS 2 BP 489 EP 511 DI 10.1016/0375-9474(94)90186-4 PG 23 WC Physics, Nuclear SC Physics GA NN280 UT WOS:A1994NN28000013 ER PT J AU BORDE, A VILENKIN, A AF BORDE, A VILENKIN, A TI ETERNAL INFLATION AND THE INITIAL SINGULARITY SO PHYSICAL REVIEW LETTERS LA English DT Article ID UNIVERSE AB It is shown that a physically reasonable spacetime that is eternally inflating to the future must possess an initial singularity. C1 LONG ISL UNIV,SOUTHAMPTON,NY 11968. BROOKHAVEN NATL LAB,HIGH ENERGY THEORY GRP,UPTON,NY 11973. RP BORDE, A (reprint author), TUFTS UNIV,DEPT PHYS & ASTRON,INST COSMOL,MEDFORD,MA 02155, USA. NR 17 TC 150 Z9 151 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 23 PY 1994 VL 72 IS 21 BP 3305 EP 3308 DI 10.1103/PhysRevLett.72.3305 PG 4 WC Physics, Multidisciplinary SC Physics GA NM835 UT WOS:A1994NM83500004 ER PT J AU SAMSON, JAR HE, ZX BARTLETT, RJ SAGURTON, M AF SAMSON, JAR HE, ZX BARTLETT, RJ SAGURTON, M TI DIRECT MEASUREMENT OF HE+ IONS PRODUCED BY COMPTON-SCATTERING BETWEEN 2.5 AND 5.5 KEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID SHELL ELECTRONS; HELIUM AB The relative cross sections for Compton scattering have been measured between 2.5 and 5.5 keV. By measuring the number of He+ ions produced with near zero recoil energies it was possible to identify ions produced by Compton scattering from those produced by photoionization. The results have been placed on an absolute basis by normalization to recent calculations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SFA INC,LANDOVER,MD 20785. RP SAMSON, JAR (reprint author), UNIV NEBRASKA,LINCOLN,NE 68588, USA. NR 16 TC 34 Z9 34 U1 0 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 23 PY 1994 VL 72 IS 21 BP 3329 EP 3331 DI 10.1103/PhysRevLett.72.3329 PG 3 WC Physics, Multidisciplinary SC Physics GA NM835 UT WOS:A1994NM83500010 ER PT J AU BANNISTER, ME GUO, XQ KOJIMA, TM DUNN, GH AF BANNISTER, ME GUO, XQ KOJIMA, TM DUNN, GH TI RESONANCE STRUCTURE AND ABSOLUTE CROSS-SECTIONS IN NEAR-THRESHOLD ELECTRON-IMPACT EXCITATION OF THE 4S(21)S-]4S4P(3)P INTERCOMBINATION TRANSITION IN KR6+ SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY-LOSS; BEAMS AB First measurements of absolute total cross sections for electron-impact excitation of an intercombination transition to a nonradiating state of an ion are reported. The cross sections for near-threshold excitation of the 4s2 1S --> 4s4p 3p transition of Kr6+ are dominated by dielectronic resonances. The measurements can serve as a benchmark for theoretical predictions of dielectronic resonance structure in the excitation of multicharged ions. C1 UNIV COLORADO,NATL INST STAND & TECHNOL,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. RP BANNISTER, ME (reprint author), OAK RIDGE NATL LAB,DEPT PHYS,OAK RIDGE,TN 37831, USA. NR 18 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 23 PY 1994 VL 72 IS 21 BP 3336 EP 3338 DI 10.1103/PhysRevLett.72.3336 PG 3 WC Physics, Multidisciplinary SC Physics GA NM835 UT WOS:A1994NM83500012 ER PT J AU NG, A CELLIERS, P FORSMAN, A MORE, RM LEE, YT PERROT, F DHARMAWARDANA, MWC RINKER, GA AF NG, A CELLIERS, P FORSMAN, A MORE, RM LEE, YT PERROT, F DHARMAWARDANA, MWC RINKER, GA TI REFLECTIVITY OF INTENSE FEMTOSECOND LASER-PULSES FROM A SIMPLE METAL SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRONGLY COUPLED PLASMA; HIGH-DENSITY PLASMA; ELECTRICAL-CONDUCTIVITY; ABSORPTION; RESISTIVITY; MODEL; 106-K; LIGHT AB Femtosecond laser heating of a solid offers the possibility of producing plasmas with near-solid densities Many reflectivity measurements have been made on such plasmas to probe their electrical conductivity. In particular, the experiment of Milchberg, Freeman, and Davey has been interpreted as showing a significant discrepancy between theoretical and measured conductivities. Here we present an alternative interpretation based on careful analysis of hydrodynamic expansion and the nonlocal interaction of the incident laser field. We find the experimental data to be largely consistent with theoretical models. This finding is also supported by the experiment of Fedosejevs et al. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CTR ETUD LIMEIL VALENTON,VELLENEUVE ST GEORGES,FRANCE. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. COLORADO STATE UNIV,FT COLLINS,CO 80523. RP NG, A (reprint author), UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. NR 26 TC 85 Z9 85 U1 4 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 23 PY 1994 VL 72 IS 21 BP 3351 EP 3354 DI 10.1103/PhysRevLett.72.3351 PG 4 WC Physics, Multidisciplinary SC Physics GA NM835 UT WOS:A1994NM83500016 ER PT J AU MARCHETTI, MC VINOKUR, VM AF MARCHETTI, MC VINOKUR, VM TI LOW-TEMPERATURE VORTEX DYNAMICS IN TWINNED SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HOPPING CONDUCTIVITY; YBA2CU3O7 CRYSTALS; BOSON LOCALIZATION; COLUMNAR DEFECTS; SINGLE-CRYSTALS AB The low-temperature dynamics of magnetic flux lines driven to move transverse to a family of parallel twin planes maps onto the dynamics of carriers in one-dimensional disordered semiconductors. As in flux arrays with columnar pins, there is a regime where the dynamics is dominated by superkink excitations that correspond to Mott variable-range hopping (VRH) of carriers. In one dimension, however, rare events, such as large regions void of twin planes, can impede VRH and dominate transport in samples that are sufficiently long in the direction of flux motion. In short samples rare regions can be responsible for mesoscopic effects. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP MARCHETTI, MC (reprint author), SYRACUSE UNIV,DEPT PHYS,SYRACUSE,NY 13244, USA. NR 18 TC 16 Z9 16 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 23 PY 1994 VL 72 IS 21 BP 3409 EP 3412 DI 10.1103/PhysRevLett.72.3409 PG 4 WC Physics, Multidisciplinary SC Physics GA NM835 UT WOS:A1994NM83500031 ER PT J AU ISAACS, ED AEPPLI, G ZSCHACK, P CHEONG, SW WILLIAMS, H BUTTREY, DJ AF ISAACS, ED AEPPLI, G ZSCHACK, P CHEONG, SW WILLIAMS, H BUTTREY, DJ TI DIFFUSE-X-RAY SCATTERING FROM LA2-XSRXNIO4 AND LA2-YSRYCUO4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID MAGNETIC CORRELATIONS; NEUTRON-SCATTERING; SPIN FLUCTUATIONS; LA2NIO4; SUPERCONDUCTIVITY; DIFFRACTION; DYNAMICS; DENSITY; CRYSTAL; OXYGEN AB We use synchrotron x-ray scattering from La1.8Sr0.2NiO4 and La1.925Sr0.075CuO4 to establish a direct relationship between carriers due to Sr doping and strong diffuse scattering. In the nickelate the scattering is peaked at the fourfold symmetric satellite positions (+/- delta, +/- delta,l), where the basal-plane coordinate delta varies with the out-of-plane coordinate l of the momentum transfer. A similar scattering pattern is observed in the cuprate, but with smaller values for delta. C1 BROOKHAVEN NATL LAB,OAK RIDGE INST SCI & EDUC,UPTON,NY 11973. UNIV DELAWARE,COLBURN LAB,DEPT CHEM ENGN,NEWARK,DE 19716. RP ISAACS, ED (reprint author), AT&T BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974, USA. NR 23 TC 57 Z9 57 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 23 PY 1994 VL 72 IS 21 BP 3421 EP 3424 DI 10.1103/PhysRevLett.72.3421 PG 4 WC Physics, Multidisciplinary SC Physics GA NM835 UT WOS:A1994NM83500034 ER PT J AU BAKER, GA ZHENG, WH OITMAA, J AF BAKER, GA ZHENG, WH OITMAA, J TI SERIES STUDY OF THE CONTINUOUS-SPIN ISING-MODEL SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID RENORMALIZATION-GROUP; 2 DIMENSIONS; SYSTEMS; UNIVERSALITY AB We study the critical exponents for the susceptibility and the correlation length for three continuous-spin models, which we call the border model, the double-well model and the single-well model, by the method of high-temperature series. We observe variations from the predictions of universality, but in some cases longer series may be required before firm conclusions can be drawn. C1 UNIV NEW S WALES,SCH PHYS,KENSINGTON,NSW 2033,AUSTRALIA. RP BAKER, GA (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD MAY 21 PY 1994 VL 27 IS 10 BP 3403 EP 3405 DI 10.1088/0305-4470/27/10/016 PG 3 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA NP433 UT WOS:A1994NP43300016 ER PT J AU LOGE, GW NERESON, N FRY, H AF LOGE, GW NERESON, N FRY, H TI DIRECT OBSERVATION OF TRANSIENT FLUORINE-ATOMS WITH 25-MU-M WAVELENGTH-STABILIZED DIODE-LASER ABSORPTION SO APPLIED OPTICS LA English DT Article ID FREQUENCY STABILIZATION; SPECTRUM; LINE AB Through the use of continuous diode laser absorption, detection of transient fluorine atoms with an initial number density in the range of 10(14) cm-3 has been demonstrated. A crucial part of the continuous-detection technique was laser frequency stabilization with a reference cell of atomic fluorine with Zeeman modulation of the absorption lines to generate a feedback signal. Long-term wavelength stability was demonstrated with second-harmonic phase-sensitive detection of the second-derivative signal for periods up to several hours. For determination of the short-term wavelength stability in the range of microseconds to seconds, a transient signal was generated by photolysis of F2 with an excimer laser at 308 nm. The initial diode laser absorption was compared to a calculated value obtained from the measured excimer laser fluence, the known dissociation cross section of F2, and the atomic fluorine absorption cross section, which included a statistical population distribution, the finite bandwidth of the laser diode, and the effects of pressure broadening. The observed absorption was approximately 33% less than the calculated value, possibly because of the diode laser's wavelength instability on the time scale of a few seconds, which is consistent with an observed amplitude instability from pulse to pulse when pulsed at 1-10 Hz. RP LOGE, GW (reprint author), LOS ALAMOS NATL LAB, POB 1663, LOS ALAMOS, NM 87545 USA. NR 13 TC 2 Z9 2 U1 1 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 20 PY 1994 VL 33 IS 15 BP 3161 EP 3168 PG 8 WC Optics SC Optics GA NM308 UT WOS:A1994NM30800001 PM 20885681 ER PT J AU AUERBACH, JM KARPENKO, VP AF AUERBACH, JM KARPENKO, VP TI SERRATED-APERTURE APODIZERS FOR HIGH-ENERGY LASER SYSTEMS SO APPLIED OPTICS LA English DT Article ID PROPAGATION AB Spatial beam apodization is a critical part of the design of high-energy solid-state laser systems. Standard methods of making apodizers include photographic and metal-vapor-deposition techniques. Apodizers fabricated with these methods are subject to damage and deterioration from high-intensity laser pulses. An alternative approach is to use a serrated-edge aperture in conjunction with the spatial filter. This system can produce beams with smooth edge profiles. We present the theory of operation of the serrated aperture along with some useful design rules and describe the successful application of a serrated-aperture apodizer in the Beamlet laser system. RP AUERBACH, JM (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, LIVERMORE, CA 94551 USA. NR 8 TC 44 Z9 50 U1 1 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 20 PY 1994 VL 33 IS 15 BP 3179 EP 3183 PG 5 WC Optics SC Optics GA NM308 UT WOS:A1994NM30800004 PM 20885684 ER PT J AU VERSLUIS, M MEIJER, G CHANDLER, DW AF VERSLUIS, M MEIJER, G CHANDLER, DW TI DEGENERATE 4-WAVE-MIXING WITH A TUNABLE EXCIMER-LASER SO APPLIED OPTICS LA English DT Article ID ENHANCED MULTIPHOTON IONIZATION; STATE-SELECTIVE DETECTION; INDUCED FLUORESCENCE; PHASE CONJUGATION; TUNING RANGE; OH; SPECTROSCOPY; FLAMES; GENERATION; GRATINGS AB We use a simple, forward-geometry degenerate four-wave mixing setup to monitor weak absorptions of various gas-phase molecules with a tunable excimer laser. With this technique, state-selective detection of H-2, CO, H2O, and O2 is demonstrated. The dependence of the forward-geometry degenerate four-wave mixing signals on various experimental parameters (e.g., pressure, laser power) is determined. Several mechanisms for the generation of the observed signals are discussed, including diffraction from density gratings or thermal gratings and two-photon degenerate four-wave mixing. C1 CATHOLIC UNIV NIJMEGEN, DEPT MOLEC & LASER PHYS, 6525 ED NIJMEGEN, NETHERLANDS. SANDIA NATL LABS, COMBUST RES FACIL, LIVERMORE, CA 94550 USA. RI Meijer, Gerard/D-2141-2009; Versluis, Michel/F-3541-2011 OI Versluis, Michel/0000-0002-2296-1860 NR 40 TC 11 Z9 11 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 20 PY 1994 VL 33 IS 15 BP 3289 EP 3925 PG 637 WC Optics SC Optics GA NM308 UT WOS:A1994NM30800021 PM 20885701 ER PT J AU MAJEWSKI, SR MUNN, JA HAWLEY, SL AF MAJEWSKI, SR MUNN, JA HAWLEY, SL TI ABSOLUTE PROPER MOTIONS TO B-SIMILAR-TO-22.5 - EVIDENCE FOR KINEMATICAL SUBSTRUCTURE IN HALO FIELD STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXY; EVOLUTION, GALAXY; FORMATION, GALAXY; HALO, GALAXY; KINEMATICS AND DYNAMICS, GALAXY; STRUCTURE, STARS; KINEMATICS ID INTERMEDIATE-BAND PHOTOMETRY; HORIZONTAL-BRANCH STARS; GALACTIC HALO; GALAXY; CLUSTERS; SYSTEMS AB Radial velocities have been obtained for six of nine stars identified on the basis of similar distances and common, extreme transverse velocities in the proper motion survey of Majewski (1992) as a candidate halo moving group at the north Galactic pole. These radial velocities correspond to velocities perpendicular to the Galactic plane which span the range -48 +/- 21 to -128 +/- 9 km s-1 (but a smaller range, - 48 +/- 21 to -86 +/- 19 km s-1, when only our own measurements are considered), significantly different than the expected distribution, with mean 0 km s-1, for a random sample of either halo or thick disk stars. The probability of picking such a set of radial velocities at random is less than 1%. Thus the radial velocity data support the hypothesis that these stars constitute part of a halo moving group or star stream at a distance of approximately 4-5 kpc above the Galactic plane. If real, this moving group is evidence for halo phase space substructure which may be the fossil remains of a destroyed globular cluster, Galactic satellite, or Searle & Zinn (1978) ''fragment.'' C1 UNIV CHICAGO,YERKES OBSERV,WILLIAMS BAY,WI 53191. LAWRENCE LIVERMORE NATL LAB,IGPP,LIVERMORE,CA 94550. RP MAJEWSKI, SR (reprint author), CARNEGIE INST WASHINGTON,OBSERV,813 SANTA BARBARA ST,PASADENA,CA 91101, USA. NR 36 TC 63 Z9 64 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 1994 VL 427 IS 1 BP L37 EP L41 DI 10.1086/187359 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NM047 UT WOS:A1994NM04700010 ER PT J AU DASILVA, AJR FALICOV, LM AF DASILVA, AJR FALICOV, LM TI MAGNETISM AND THE ALPHA-BETA-PHASE TRANSITION IN SOLID OXYGEN SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DYNAMICS AB The electronic spectra of alpha and beta solid O2 were calculated in a full many-body approach for a cluster consisting of four O2 molecules with periodic boundary conditions. Only the partially occupied pi orbitals (sixteen spin-orbitals, eight electrons) were included. The lowest 81 many-body states, which correspond to neutral, unexcited molecules, describe accurately the magnetic excitations of the solids. The two phases have very different spectra resulting, even at very low temperatures, in a large difference in the (magnetic) entropy. The calculated entropy difference at 23.9 K (the alpha-beta phase transition temperature) agrees surprisingly well with the experimentally measured heat of transformation. C1 LAWRENCE BERKELEY LAB,DIV MATH SCI,BERKELEY,CA 94720. RP DASILVA, AJR (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 26 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAY 20 PY 1994 VL 222 IS 4 BP 339 EP 342 DI 10.1016/0009-2614(94)87071-3 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NM444 UT WOS:A1994NM44400006 ER PT J AU Kim, KH Lindberg, SE AF Kim, Ki-Hyun Lindberg, Steven E. TI High-precision measurements of mercury vapor in air: Design of a six-port-manifold mass flow controller system and evaluation of mass flow errors at atmospheric pressure SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB We constructed an atmospheric sampling system for Hg vapor that utilizes a single vacuum pump connected via a manifold to six separate mass flow controllers (MFC). The manifold system reduces the size and power requirements for collection of replicate samples, is ideally suited for use on meteorological towers, and achieves the precise control of air-sampling volumes required for computing air/surface exchange rates from concentration gradients of Hg vapor. In testing our air sampling systems, we found consistent calibration errors between the manufacturer's calibrations and a standard bubble flow meter. Errors as high as 30% decreased systematically with increasing flow rate to values of 3-5% at near-maximum flow. The relative error patterns established between adjacent MFC units in each system were found to be relatively stable over time. Using gold-coated sand amalgamation traps for Hg vapor and the flow correction factors computed from our calibrations, we routinely achieve precision for replicate measurements of Hg vapor in background air of 0.5-2% (expressed as relative standard errors of mean concentrations of 1.5-3.5 ng/m(3)). Application of the flow correction factors measurably decreases the level of bias between mean concentrations of Hg vapor measured with adjacent sampling systems and is necessary to reduce uncertainty associated with quantifying gradients in atmospheric concentrations. C1 [Kim, Ki-Hyun; Lindberg, Steven E.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Kim, KH (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. FU U. S. Department of Energy and the Electric Power Research Institute; Martin Marietta Energy Systems, Inc., U. S. Department of Energy [DE-AC05-84OR21400] FX We wish to thank Jeff Riggs and Roy Freeman for their assistance with the design and construction of the ORNL mass flow controller systems. We are also grateful to Paul Hanson, Tilden Meyers, and Bill Schroeder for their constructive criticism on an early version of our manuscript. The first author thanks Jim Owens and Allen Pendergrass for their collaboration during the field sampling as well as their initial input for this project. Research sponsored by the U. S. Department of Energy and the Electric Power Research Institute under contract with ORNL. ORNL is managed by Martin Marietta Energy Systems, Inc., for the U. S. Department of Energy under contract DE-AC05-84OR21400. Publication 4162 of the Environmental Sciences Division, ORNL. NR 17 TC 27 Z9 27 U1 1 U2 2 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 1994 VL 99 IS D3 BP 5379 EP 5384 DI 10.1029/93JD02657 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA V04QH UT WOS:000207072400008 ER PT J AU Reinsel, GC Tiao, GC Wuebbles, DJ Kerr, JB Miller, AJ Nagatani, RM Bishop, L Ying, LH AF Reinsel, Gregory C. Tiao, George C. Wuebbles, Donald J. Kerr, James B. Miller, Alvin J. Nagatani, Ronald M. Bishop, Lane Ying, Lisa H. TI Seasonal trend analysis of published ground-based and TOMS total ozone data through 1991 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB A seasonal trend analysis of published Dobson (including stations' newly revised and Brewer-simulated Dobson) total ozone data through 1991 from a network of 56 stations has been performed, using three different data periods. The trend results for the longest data period 1964-1991 indicate substantial negative trends in ozone in the higher northern latitudes during the winter and spring seasons, some evidence of negative trend in the higher southern latitudes (30 degrees S-55 degrees S) during all seasons, and trends close to zero for all seasons over the 30 degrees S-30 degrees N latitude range. For the shortest data period, November 1978 through 1991, there is a clear indication that trends have become more negative in the higher northern latitudes, especially during the winter and spring seasons, and also in the higher southern latitudes in all seasons. A seasonal trend analysis of zonal averages of total ozone mapping spectrometer (TOMS) satellite total ozone data for the comparable period November 1978 through 1991 has also been performed, and moderately good agreement is found between trends in Dobson and TOMS data over this period. C1 [Reinsel, Gregory C.; Ying, Lisa H.] Univ Wisconsin, Dept Stat, Madison, WI 53706 USA. [Bishop, Lane] Allied Signal Inc, Ctr Appl Math, Buffalo, NY 14210 USA. [Kerr, James B.] Atmospher Environm Serv, Toronto, ON M3H 5T4, Canada. [Miller, Alvin J.; Nagatani, Ronald M.] Natl Ocean & Atmospher Adm, NWS Climate Anal Ctr, Washington, DC 20233 USA. [Tiao, George C.] Univ Chicago, Grad Sch Business, Chicago, IL 60637 USA. [Wuebbles, Donald J.] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Reinsel, GC (reprint author), Univ Wisconsin, Dept Stat, Madison, WI 53706 USA. EM reinsel@stat.wisc.edu; gct@gsbgct.uchicago.edu; wuebbles@llnl.gov; jkerr@dow.on.doe.ca; miller@upair.wwb.noaa.gov; bishop@research.allied.com FU Alternative Fluorocarbons Environmental Acceptability Study (AFEAS); National Aeronautics and Space Administration (NASA); National Oceanic and Atmospheric Administration (NOAA) FX This research was supported in part by the Alternative Fluorocarbons Environmental Acceptability Study (AFEAS), the National Aeronautics and Space Administration ( NASA), and the National Oceanic and Atmospheric Administration (NOAA). The authors also would like to thank the reviewers for several helpful comments that improved the paper. NR 20 TC 64 Z9 68 U1 0 U2 1 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 1994 VL 99 IS D3 BP 5449 EP 5464 DI 10.1029/93JD03517 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA V04QH UT WOS:000207072400013 ER PT J AU BOYLE, JS AF BOYLE, JS TI THE INTERRELATIONSHIP BETWEEN TEMPERATURE-CHANGES IN THE FREE ATMOSPHERE MICROWAVE SOUNDING UNIT AND SEA-SURFACE TEMPERATURE-CHANGES IN A 10-YEAR ATMOSPHERIC MODEL INTERCOMPARISON PROJECT CLIMATE SIMULATION SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB A 10-year atmospheric simulation was run using the European Centre for Medium-Range Weather Forecasts (cycle 36) model for the decade 1979-1988. The observed monthly mean sea surface temperatures were specified in the integration. This simulation was part of the Atmospheric Model Intercomparison Project. From the output of the model, simulated monthly mean microwave sounding unit (MSU) temperatures were computed. The anomalies of these monthly MSU temperatures were then compared to the observations and to previously published works. The results are as follows: (1) The model displays similar patterns of MSU/sea surface temperature (SST) correlations to the data of Trenberth et al. (1992). These patterns are formed by spatial variations in the SST signal and by the varying response of the atmosphere to SST changes. (2) The model evidently underestimates the air-sea exchange of heat in the region of the Kuroshio current. (3) The point correlation patterns in the MSU temperatures for the 10-year period are strongly influenced El Nino-Southern Oscillation (ENSO) events in this decade. (4) The dominance of the signal of the 1982/1983 and 1986/1987 events makes it risky to extend the relationships seen in this decade to other, less active periods. (5) The model tends to produce MSU anomalies in good accord with the observations only during ENSO western Pacific warm events. RP BOYLE, JS (reprint author), LAWRENCE LIVERMORE NATL LAB, PCMDI, L-264, POB 808, LIVERMORE, CA 94550 USA. NR 15 TC 2 Z9 2 U1 0 U2 0 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 1994 VL 99 IS D5 BP 10365 EP 10375 DI 10.1029/94JD00546 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NN517 UT WOS:A1994NN51700006 ER PT J AU BHATTACHARYA, RN BLAUGHER, RD AF BHATTACHARYA, RN BLAUGHER, RD TI PROCESSING OF AG DOPED THICK-FILM ELECTRODEPOSITED THALLIUM-OXIDE SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID CA-CU-O; ELECTROCHEMICAL SYNTHESIS; YBACUO; TLBACACUO AB Thick-film superconductors of Tl-Ba-Ca-Cu-O (TBCCO) doped with Ag were synthesized on Ag foil using an electrodeposition process. Films deposited and reacted with or without an additional Tl source showed 1223 as the major phase. The transport critical current density for the film annealed in the presence of a TBCCO (2223) pellet was 14 630 A/cm2 at 76 K in zero field and 8710 A/cm2 at 76 K in zero field for the film annealed in the absence of any Tl source. RP BHATTACHARYA, RN (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 20 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 20 PY 1994 VL 225 IS 3-4 BP 269 EP 274 DI 10.1016/0921-4534(94)90723-4 PG 6 WC Physics, Applied SC Physics GA NP354 UT WOS:A1994NP35400009 ER PT J AU LEDBETTER, H LEI, M HERMANN, A SHENG, ZZ AF LEDBETTER, H LEI, M HERMANN, A SHENG, ZZ TI LOW-TEMPERATURE ELASTIC-CONSTANTS OF Y1BA2CU3O7 SO PHYSICA C LA English DT Article ID SUPERCONDUCTING TRANSITION; SINGLE-CRYSTALS; YBA2CU3O7-DELTA; PRESSURE AB Using ultrasonic methods, we studied the 4-295 K elastic constants of a ''good'' Y1Ba2Cu3O7 polycrystal. We report the bulk, shear, Young moduli and the Poisson ratio. Except for the Poisson ratio, all elastic constants show smooth temperature behavior. Near T(c), during cooling, the Poisson ratio decreases irregularly. Focusing on the bulk modulus B, we use simple thermodynamics to show that the harmonic-observed decrement at T=0 corresponds to expectation, but the temperature effect dB/dT is too large by about a factor of two. We attribute the irregular slope to oxygen-atom reordering. Against many reports, our bulk-modulus value is approximately that found in monocrystals or that predicted by an ionic-crystal model calculation. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. UNIV ARKANSAS,FAYETTEVILLE,AR 72701. RP LEDBETTER, H (reprint author), NATL INST STAND & TECHNOL,BOULDER,CO 80303, USA. NR 29 TC 27 Z9 27 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 20 PY 1994 VL 225 IS 3-4 BP 397 EP 403 DI 10.1016/0921-4534(94)90741-2 PG 7 WC Physics, Applied SC Physics GA NP354 UT WOS:A1994NP35400027 ER PT J AU FALLIS, MC WRIGHT, AF FONG, CY DAW, MS AF FALLIS, MC WRIGHT, AF FONG, CY DAW, MS TI TRAPPING OF A DIFFUSING ADATOM BY A SUBSTITUTIONAL SURFACE DEFECT SO SURFACE SCIENCE LA English DT Letter ID EMBEDDED-ATOM-METHOD; PSEUDOPOTENTIAL THEORY; SELF-DIFFUSION; NI SURFACES; CLUSTERS; AG; PD; POTENTIALS; PT(001); CU AB We propose a simple model to explain qualitatively the results of a recent field-ion-microscopy (FIM) study in which a substitutional Ir atom in the Rh(001) surface traps diffusing Rh adatoms [G.L. Kellogg, Phys. Rev. Lett., to be published]. The proposed explanation is supported by an embedded-atom-method investigation of the effect of a substitutional Pt atom in the Pd(001) surface on Pd adatom diffusion. We find a smaller energy barrier for a single adatom to diffuse around the defect than away from it, i.e., the adatom is effectively trapped by this defect in qualitative agreement with the FIM study. We also find that Pd adatom clusters are more strongly bound at the defect than away from it, indicating that such a defect can act as a nucleation site for cluster growth. C1 SANDIA NATL LABS,DEPT SEMICOND PHYS,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,DEPT COMPUTAT MAT SCI,LIVERMORE,CA 94551. RP FALLIS, MC (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 22 TC 4 Z9 4 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 20 PY 1994 VL 311 IS 3 BP L717 EP L723 DI 10.1016/0039-6028(94)91415-X PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NM726 UT WOS:A1994NM72600005 ER PT J AU LEHNERT, BE ARCHULETA, DC ELLIS, T SESSION, WS LEHNERT, NM GURLEY, LR STAVERT, DM AF LEHNERT, BE ARCHULETA, DC ELLIS, T SESSION, WS LEHNERT, NM GURLEY, LR STAVERT, DM TI LUNG INJURY FOLLOWING EXPOSURE OF RATS TO RELATIVELY HIGH-MASS CONCENTRATIONS OF NITROGEN-DIOXIDE SO TOXICOLOGY LA English DT Article; Proceedings Paper CT Symposium on Effects of Exposure to Nitrogen Dioxide CY OCT 28, 1992 CL WALTER REED ARMY INST RES, WASHINGTON, DC HO WALTER REED ARMY INST RES DE NITROGEN DIOXIDE; ACUTE LUNG INJURY; PULMONARY EDEMA; TAURINE; VENTILATION; EXERCISE; BRONCHOALVEOLAR LAVAGE ID ALVEOLAR MACROPHAGES; TAURINE; NO2; NEUTROPHILS; PROTEINS; CELLS AB Human inhalation exposures to relatively high mass concentrations of the oxidant gas nitrogen dioxide (NO2) can result in a variety of pulmonary disorders, including life-threatening pulmonary edema, pneumonia, and bronchiolitis obliterans. Inasmuch as most experimental studies to date have examined NO2-induced lung injury following exposures to near ambient or supra-ambient concentrations of NO2, e.g., less than or equal to 50 ppm, little detailed information about the pulmonary injurious responses following the acute inhalation of higher NO2 concentrations that are more commensurate with some actual human exposure conditions is currently available. Described in this report are the results from a series of investigations in which various aspects of the inhalation toxicity of high concentrations of NO2 have been examined in laboratory rats. In the first component of our study, we characterized the kinetic course of development of lung injury following acute exposures to high concentrations of NO2 delivered over varying durations, and we assessed the relative importance of NO2 exposure concentration versus exposure time in producing lung injury. For a given exposure duration, the resulting severity of lung injury was found to generally scale proportionately with inhaled mass concentration, whereas for a given concentration of inhaled NO2, the magnitude of resulting injury was not directly proportional to exposure duration. Moreover, evidence was obtained that indicated exposure concentration is more important than exposure time when high concentrations of NO2 are inhaled. In a second component of our investigation, we assessed the pulmonary injurious response that occurs when NO2 is inhaled during very brief, 'high burst' exposures to very high concentrations of NO2. Such exposures resulted in significant lung injury, with the magnitude of such injury being directly proportional to exposure concentration. Comparisons of results obtained from this and the first component studies additionally revealed that brief exposures to the very high concentrations of NO2 are more hazardous than longer duration exposures to lower concentrations. In a third study series, we examined pre-exposure, exposure, and post-exposure modifiers of NO2-induced lung injury, including dietary taurine, minute ventilation, and post-exposure exercise. Results from these studies indicated: (i) dietary taurine does not protect the rat lung against high concentration NO2 exposure, (ii) the severity of acute lung injury in response to NO2 inhalation is increased by an increase in minute ventilation during exposure, and (iii) the performance of exercise after NO2 exposure can significantly enhance the injurious response to NO2. In a final, more mechanistic study component in which we investigated the acute hyperpermeability response to high NO2 and the recruitment of inflammatory cells into the alveoli, evidence was obtained to suggest that no important relationship exists between the hyperpermeability response to NO2 and elevations of polymorphonuclear leukocytes and alveolar macrophages in the alveoli. RP LEHNERT, BE (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI MS M888,CELL GROWTH DAMAGE & REPAIR GRP,LOS ALAMOS,NM 87545, USA. NR 52 TC 11 Z9 15 U1 1 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0300-483X J9 TOXICOLOGY JI Toxicology PD MAY 20 PY 1994 VL 89 IS 3 BP 239 EP 277 DI 10.1016/0300-483X(94)90100-7 PG 39 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA NU842 UT WOS:A1994NU84200005 PM 8023331 ER PT J AU FARID, RS CHANG, IJ WINKLER, JR GRAY, HB AF FARID, RS CHANG, IJ WINKLER, JR GRAY, HB TI PHOTOINDUCED ELECTRON-TRANSFER IN IRIDIUM(SPACER)PYRIDINIUM COMPLEXES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID SATURATED-HYDROCARBON BRIDGES; DISTANCE DEPENDENCE; THROUGH-BOND; CHARGE SEPARATION; EXCITED-STATES; TRANSFER RATES; RECOMBINATION; ABSORPTION; MOLECULES; SINGLET AB Photoinduced electron-transfer (ET) reactions in a series of iridium(spacer)pyridinium complexes, [Ir(mu-pz*)(Co)ph(2)POC(6)H(4)(CH2)(n)-A(+)](2) 2 (pz* = 3,5-dimethylpyrazolyl; Ph = C6H5; C6H4 = phenylene; A(+) = pyridinium (pY(+)) or substituted py(+); n = 0-3), have been studied in acetonitrile solution at room temperature. The rates of singlet (Ir-1(2)* --> A(+): (1)ET) reactions were determined for each complex, and for n = 1 and 2 species, the rates of thermal charge recombination (ET(b)) also were measured. The ET rates for the n = 1 system display a Gaussian free-energy dependence (lambda = 1.0 eV, H-AB = 5 Cm-1). With one exception, maximum ET rates exhibit an exponential dependence upon the number of carbon atoms (alpha(C)) in the spacer. The exception is the n = 1 (alpha(C) = 5) system; k(max) is almost a factor of 100 slower than predicted by the exponential dependence on alpha C, indicating that donor-acceptor electronic coupling through a single methylene link is unusually weak. C1 CALTECH,BECKMAN INST,PASADENA,CA 91125. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 29 TC 20 Z9 20 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 19 PY 1994 VL 98 IS 20 BP 5176 EP 5179 DI 10.1021/j100071a001 PG 4 WC Chemistry, Physical SC Chemistry GA NN032 UT WOS:A1994NN03200001 ER PT J AU GUDOWSKANOWAK, E AF GUDOWSKANOWAK, E TI EFFECTS OF HETEROGENEITY ON RELAXATION DYNAMICS AND ELECTRON-TRANSFER RATES IN PHOTOSYNTHETIC REACTION CENTERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Review ID BACTERIAL REACTION CENTERS; PRIMARY CHARGE SEPARATION; TRANSITION-STATE THEORY; RANDOM-ENERGY-MODEL; MOLECULAR-DYNAMICS; BROWNIAN-MOTION; POLAR-SOLVENTS; QUANTUM-MECHANICS; TRANSFER KINETICS; SPIN-GLASSES AB The excitation and relaxation of the nuclear medium modes which couple to the electronic states can significantly modulate the dynamics of electron transfer (ET) when the relaxation process is sufficiently slow. Recent molecular dynamics (MD) studies of reaction centers (RC) show that the dynamical response of the proteic environment has noticeable nonlinear behavior, and the observed slow decay of the time correlation functions is suggestive of glassy dynamics in the system. In this context, we consider two possible models for the RC relaxation times. The first model of a ''static disorder'' discusses relaxation dynamics in the presence of a ''rough'' free energy potential. A rough potential has a smooth background on which randomly fluctuating local perturbations are superimposed. Distribution of the perturbations determines the relaxation dynamics and may be responsible for the dynamical, temperature-dependent phase change in the medium. In particular, the mean sojourn time in such a free energy potential well is no longer exponentially distributed, and this effect may explain the complex decay dynamics of the primary donor in RCs. A similar behavior can be found in a complementary model of a ''dynamic disorder'' where spontaneous conformational isomerization of chromophores causes the transition from one configurational state to another and back. The importance of such a transition, induced by-a polar group isomerization in the neighboring amino acid side chains of bacteriochlorophylls, has been suggested in the MD studies of the time-variations of the electrostatic energy at the chromophores in RCs. With the assumption that the time the system spends in a particular conformation state is Poisson distributed, the decay time is evaluated by a stochastic analysis of the isomerization process and compared with kinetics predicted by other models of the primary ET in RCs. RP GUDOWSKANOWAK, E (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. RI Gudowska-Nowak, Ewa/A-7622-2014 OI Gudowska-Nowak, Ewa/0000-0001-5604-094X NR 106 TC 17 Z9 17 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 19 PY 1994 VL 98 IS 20 BP 5257 EP 5264 DI 10.1021/j100071a015 PG 8 WC Chemistry, Physical SC Chemistry GA NN032 UT WOS:A1994NN03200015 ER PT J AU LEE, KJ MCCORMICK, WD PEARSON, JE SWINNEY, HL AF LEE, KJ MCCORMICK, WD PEARSON, JE SWINNEY, HL TI EXPERIMENTAL-OBSERVATION OF SELF-REPLICATING SPOTS IN A REACTION-DIFFUSION SYSTEM SO NATURE LA English DT Article AB IN his classic 1952 paper, Turing(1) suggested a possible connection between patterns in biological systems and patterns that could form spontaneously in chemical reaction-diffusion systems. Turing's analysis stimulated considerable theoretical research on mathematical models of pattern formation, but Turing-type patterns were not observed in controlled laboratory experiments until 1990(2,3). Subsequently there has been a renewed interest in chemical pattern formation and in the relationship of chemical patterns to the remarkably similar patterns observed in diverse physical and biological systems(4). Numerical simulations of a simple model chemical system have recently revealed spot patterns that undergo a continuous process of 'birth' through replication and 'death' through overcrowding(5). Here we report the observation of a similar phenomenon in laboratory experiments on the ferrocyanide-iodate-sulphite reaction. Repeated growth and replication can be observed for a wide range of experimental parameters, and can be reproduced by a simple two-species model, suggesting that replicating spots may occur in many reaction-diffusion systems. C1 UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP LEE, KJ (reprint author), UNIV TEXAS,CTR NONLINEAR DYNAM,AUSTIN,TX 78712, USA. NR 13 TC 339 Z9 339 U1 3 U2 23 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 19 PY 1994 VL 369 IS 6477 BP 215 EP 218 DI 10.1038/369215a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NM067 UT WOS:A1994NM06700050 ER PT J AU SIMPSON, J RILEY, MA GALE, SJ SHARPEYSCHAFER, JF BENTLEY, MA BRUCE, AM CHAPMAN, R CLARK, RM CLARKE, S COPNELL, J CULLEN, DM FALLON, P FITZPATRICK, A FORSYTH, PD FREEMAN, SJ JONES, PM JOYCE, MJ LIDEN, F LISLE, JC MACCHIAVELLI, AO SMITH, AG SMITH, JF SWEENEY, J THOMPSON, DM WARBURTON, S WILSON, JN BENGTSSON, T RAGNARSSON, T AF SIMPSON, J RILEY, MA GALE, SJ SHARPEYSCHAFER, JF BENTLEY, MA BRUCE, AM CHAPMAN, R CLARK, RM CLARKE, S COPNELL, J CULLEN, DM FALLON, P FITZPATRICK, A FORSYTH, PD FREEMAN, SJ JONES, PM JOYCE, MJ LIDEN, F LISLE, JC MACCHIAVELLI, AO SMITH, AG SMITH, JF SWEENEY, J THOMPSON, DM WARBURTON, S WILSON, JN BENGTSSON, T RAGNARSSON, T TI SINGLE-PARTICLE EXCITATIONS AND PROPERTIES OF MULTIPLE BAND TERMINATIONS NEAR SPIN 50H IN ER-158 SO PHYSICS LETTERS B LA English DT Article ID STRUCTURAL-CHANGES; YRAST LINE; DY-154; YB-158; NUCLEI AB The competition between collective rotation and single-particle behaviour at high spin in 158Er has been investigated with the Eurogam spectrometer. Band terminating states have been observed in three structures at I(pi) = 46+, 48- and 49- and specific single-particle configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. These special states are found to be related by very simple single particle excitations. These data indicate that an oblate mean field (epsilon approximately -0.14) is established for a nuclear core plus 12 aligned valence nucleons which is stable against single-particle rearrangements. In the (pi, alpha) = (+,0) states the collective and weakly collective terminating structures are observed to coexist between 30+ and 46+. C1 FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,ENGLAND. UNIV BRIGHTON,DEPT MATH SCI,BRIGHTON BN2 4GJ,ENGLAND. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. UNIV MANCHESTER,SCHUSTER LAB,MANCHESTER M13 9PL,LANCS,ENGLAND. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. STAFFORDSHIRE UNIV,SCH SCI,STOKE ON TRENT ST4 2DE,ENGLAND. UNIV PAISLEY,DEPT PHYS,PAISLEY PA1 2BE,SCOTLAND. NIELS BOHR INST,TANDEM ACCELERATOR LAB,DK-4000 ROSKILDE,DENMARK. ABB CORP RES,S-72178 VASTERAS,SWEDEN. LUND INST TECHNOL,DEPT MATH PHYS,S-22100 LUND,SWEDEN. RP SIMPSON, J (reprint author), SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. RI Freeman, Sean/B-1280-2010 OI Freeman, Sean/0000-0001-9773-4921 NR 21 TC 71 Z9 71 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 19 PY 1994 VL 327 IS 3-4 BP 187 EP 194 DI 10.1016/0370-2693(94)90716-1 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP231 UT WOS:A1994NP23100003 ER PT J AU ANSELMANN, P HAMPEL, W HEUSSER, G KIKO, J KIRSTEN, T LAUBENSTEIN, M PERNICKA, E PEZZONI, S RONN, U SANN, M SCHLOSSER, C WINK, R WOJCIK, M VONAMMON, R EBERT, KH FRITSCH, T HELLRIEGEL, K HENRICH, E STIEGLITZ, L WEIRICH, F BALATA, M FERRARI, N LALLA, H BELLOTTI, E CATTADORI, C CREMONESI, O FIORINI, E ZANOTTI, L ALTMANN, M VONFEILITZSCH, F MOSSBAUER, R SCHANDA, U BERTHOMIEU, G SCHATZMAN, E CARMI, I DOSTROVSKY, I BACCI, C BELLI, P BERNABEI, R DANGELO, S PAOLUZI, L BEVILACQUA, A CHARBIT, S CRIBIER, M GOSSET, L RICH, J SPIRO, M STOLARCZYK, T TAO, C VIGNAUD, D HAHN, RL HARTMANN, FX ROWLEY, JK STOENNER, RW WENESER, J AF ANSELMANN, P HAMPEL, W HEUSSER, G KIKO, J KIRSTEN, T LAUBENSTEIN, M PERNICKA, E PEZZONI, S RONN, U SANN, M SCHLOSSER, C WINK, R WOJCIK, M VONAMMON, R EBERT, KH FRITSCH, T HELLRIEGEL, K HENRICH, E STIEGLITZ, L WEIRICH, F BALATA, M FERRARI, N LALLA, H BELLOTTI, E CATTADORI, C CREMONESI, O FIORINI, E ZANOTTI, L ALTMANN, M VONFEILITZSCH, F MOSSBAUER, R SCHANDA, U BERTHOMIEU, G SCHATZMAN, E CARMI, I DOSTROVSKY, I BACCI, C BELLI, P BERNABEI, R DANGELO, S PAOLUZI, L BEVILACQUA, A CHARBIT, S CRIBIER, M GOSSET, L RICH, J SPIRO, M STOLARCZYK, T TAO, C VIGNAUD, D HAHN, RL HARTMANN, FX ROWLEY, JK STOENNER, RW WENESER, J TI GALLEX RESULTS FROM THE 1ST 30 SOLAR-NEUTRINO RUNS SO PHYSICS LETTERS B LA English DT Article ID OSCILLATIONS; MODEL; UNCERTAINTIES; DETECTOR; PHYSICS; MATTER; SUN AB We report new GALLEX solar neutrino results from 15 runs covering 406 days (live time) within the exposure period 19 August 1992-13 October 1993 (''GALLEX II''). With counting data considered until 4 January 1994, the new result is [78 +/- 13 (stat.) +/- 5 (syst.)] SNU (1 sigma). It confirms our previous result for the 15 initial runs (''GALLEX I'') of [81 +/- 17 (stat.) +/- 9 (syst.)] SNU. After two years of recording the solar neutrino flux with the GALLEX detector, the combined result from 30 solar runs (GALLEX I + GALLEX II) is [79 +/- 10 (stat.) +/- 6 (syst.)] SNU (1 sigma). In addition, 19 ''blank'' runs gave the expected null result. GALLEX neutrino experiments are continuing. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE,INST HEISSE CHEM,D-76021 KARLSRUHE,GERMANY. LAB NAZL GRAN SASSO,I-67010 LAQUILA,ITALY. INFN,I-20133 MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. TECH UNIV MUNICH,DEPT PHYS E15,D-85748 GARCHING,GERMANY. OBSERV COTE AZUR,DEPT CASSINI,F-06004 NICE 4,FRANCE. WEIZMANN INST SCI,DEPT ENVIRONM & ENERGY RES,IL-76100 REHOVOT,ISRAEL. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS 2,I-00133 ROME,ITALY. CE SACLAY,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE. BROOKHAVEN NATL LAB,UPTON,NY 11973. INFN,I-00133 ROME,ITALY. RP ANSELMANN, P (reprint author), MAX PLANCK INST KERNPHYS,POSTFACH 103980,D-69029 HEIDELBERG,GERMANY. RI Belli, Pierluigi/H-1942-2012; Laubenstein, Matthias/C-4851-2013; Bernabei, Rita/C-1212-2016 OI Belli, Pierluigi/0000-0003-4517-4891; Laubenstein, Matthias/0000-0001-5390-4343; Bernabei, Rita/0000-0003-1786-5396 NR 42 TC 237 Z9 240 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 19 PY 1994 VL 327 IS 3-4 BP 377 EP 385 DI 10.1016/0370-2693(94)90744-7 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP231 UT WOS:A1994NP23100031 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNE, RRA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DEFEZLASO, MDM DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FOUSSET, JL FRANCON, S FRANKEL, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOLIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJG GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERXNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NILSEN, PES NISS, P NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, J RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W 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MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NILSEN, PES NISS, P NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, J RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI MEASUREMENT OF THE E+E- -] GAMMA-GAMMA(GAMMA) CROSS-SECTION AT LEP ENERGIES SO PHYSICS LETTERS B LA English DT Article ID DECAYS; ANNIHILATION AB The total and the differential cross sections for the reaction e+e- --> gammagamma(gamma) have been measured with the DELPHI detector at LEP using an integrated luminosity of 36.9 pb-1. The results agree with the QED predictions and consequently there is no evidence for non-standard channels with the same experimental signature. The lower limits obtained on the QED cutoff parameters are LAMBDA+ > 143 GeV and LAMBDA- > 120 GeV, and the lower bound on the mass of an excited electron with an effective coupling constant lambda(gamma) = 1 is 132 GeV/c2. Upper limits on the branching ratios for the decays Z0 --> gammagamma, Z0 --> pi0gamma, Z0 --> etagamma and Z0 --> gammagammagamma have been determined to be 5.5 x 10(-5), 5.5 x 10(-5), 8.0 x 10(-5), and 1.7 x 10-5 respectively. All the limits are at the 95% confidence level. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV LIBRE BRUXELLES,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CZECHOSLOVAK ACAD SCI,DIV HIGH ENERGY PHYS,F2U,INST PHYS,CS-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,CNRS,IN2P3,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV HELSINKI,SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,101000 MOSCOW,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENEXRGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,CNRS,IN2P3,LPHNE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,CNRS,IN2P3,LPHNE,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,INPL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,MFF,CTR NUCL,NC,CS-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF 4,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. CENS,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV L JUBLJANA,J STEPFHAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,PL-00681 WARSAW,POLAND. INST NUCLL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST LIP,AV ELTAS GARCIA,141O,P-1000 LISBON,PORTUGAL. RI Yip, Kin/D-6860-2013; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011 OI Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; Yip, Kin/0000-0002-8576-4311; PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; NR 23 TC 24 Z9 24 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 19 PY 1994 VL 327 IS 3-4 BP 386 EP 396 DI 10.1016/0370-2693(94)90745-5 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP231 UT WOS:A1994NP23100032 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DEGENER, T DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKI, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LOSER, F LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, CN PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZOU, BS ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DEGENER, T DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKI, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LOSER, F LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, CN PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZOU, BS ZUPANCIC, C TI STUDY OF (P)OVER-BAR-P ANNIHILATION AT REST INTO OMEGA-ETA-PI-0 SO PHYSICS LETTERS B LA English DT Article AB We have studied ppBAR annihilations at rest in liquid hydrogen into the final state omegaetapi0 where omega decays to pi0gamma. This reaction is dominated by the production of a0(980) and contributions from a2(1320) and b1(0) (1235). Upper limits for the production of an axial vector h1'(1380) meson and vector mesons omega(1390), omega(1600), and phi(1680) decaying to omegaeta are given. The branching ratio of ppBAR annihilation into omegaetapi0 was determined to be (0.68 +/- 0.01 +/- 0.05)%. C1 UNIV BOCHUM,D-44780 BOCHUM,GERMANY. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV HAMBURG,D-22761 HAMBURG,GERMANY. UNIV KARLSRUHE,D-76344 KARLSRUHE,GERMANY. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,D-55099 MAINZ,GERMANY. UNIV MUNICH,D-85748 MUNICH,GERMANY. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RP AMSLER, C (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 12 TC 21 Z9 21 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 19 PY 1994 VL 327 IS 3-4 BP 425 EP 432 DI 10.1016/0370-2693(94)90748-X PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP231 UT WOS:A1994NP23100035 ER PT J AU ANDERSEN, E BLAES, R BROM, JM CAINES, HL CHERNEY, M DELACRUZ, B FERNANDEZ, C GARABATOS, C GARZON, JA GEIST, W GREINER, DE GRUHN, CR HAFIDOUNI, M HILL, A HRUBEC, J JONES, PG JUDD, EG KUIPERS, JPM LADREM, M DEGUEVARA, PL LOVHOIDEN, G MACNAUGHTON, J MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G DELOSHEROS, CP PLO, M PORTH, P POWELL, B RAMIL, A ROHRINGER, H SAKREJDA, I THORSTEINSEN, TF TRAXLER, J VOLTOLINI, C WOZNIAK, K YANEZ, A ZYBERT, R AF ANDERSEN, E BLAES, R BROM, JM CAINES, HL CHERNEY, M DELACRUZ, B FERNANDEZ, C GARABATOS, C GARZON, JA GEIST, W GREINER, DE GRUHN, CR HAFIDOUNI, M HILL, A HRUBEC, J JONES, PG JUDD, EG KUIPERS, JPM LADREM, M DEGUEVARA, PL LOVHOIDEN, G MACNAUGHTON, J MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G DELOSHEROS, CP PLO, M PORTH, P POWELL, B RAMIL, A ROHRINGER, H SAKREJDA, I THORSTEINSEN, TF TRAXLER, J VOLTOLINI, C WOZNIAK, K YANEZ, A ZYBERT, R TI PRODUCTION OF LAMBDA,(LAMBDA)OVER-BAR, AND XI-,(XI)OVER-BAR-+ PARTICLES IN S+PB COLLISIONS AT 200 GEV/C PER NUCLEON SO PHYSICS LETTERS B LA English DT Article ID QUARK-GLUON PLASMA; HEAVY-ION COLLISIONS; STRANGE ANTI-BARYONS; SULFUR AB The yields of LAMBDA, LAMBDABAR, and XI-, XI+BAR have been measured close to mid-rapidity in sulphur reactions on a Pb target at 200 GeV/c per nucleon beam momentum. Fully corrected production ratios of LAMBDABAR/LAMBDA, XI+BAR/XI, XI-/LAMBDA and XI+BAR/LAMBDABAR are presented. The ratios have been analysed both in the context of a rapidly disintegrating quark-gluon plasma and a hadronic resonance gas. Our analysis shows that the hadron gas model is sufficient to explain the observed particle yields. C1 LAWRENCE BERKELEY LAB,MAILSTOP 50D,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. CERN,EUROPEAN ORG NUCL RES,CH-1211 GENEVA 23,SWITZERLAND. INST FIZ JADROWEJ,PL-30055 KRAKOW 30,POLAND. CIEMAT,DIV PARTICULAS,E-28040 MADRID,SPAIN. CREIGHTON UNIV,DEPT PHYS,OMAHA,NE 68178. UNIV SANTIAGO,DEPT FIS PARTICULAS,E-15706 SANTIAGO,SPAIN. UNIV LOUIS PASTEUR,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. INST HOCHENERGIEPHYS HEPHY,A-1050 VIENNA,AUSTRIA. RI de la Cruz, Begona/K-7552-2014; Plo Casasus, Maximo/M-1445-2014; Ramil, Alberto/B-4698-2008 OI Plo Casasus, Maximo/0000-0002-2289-918X; Ramil, Alberto/0000-0002-5333-9425 NR 19 TC 34 Z9 34 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAY 19 PY 1994 VL 327 IS 3-4 BP 433 EP 438 DI 10.1016/0370-2693(94)90749-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NP231 UT WOS:A1994NP23100036 ER PT J AU HASCALL, T OLMSTEAD, MM POWER, PP AF HASCALL, T OLMSTEAD, MM POWER, PP TI SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF [((ET(2)O)MG)(6)(NPH)(4)BR-4] - A MAGNESIUM-IMIDE CAGE SPECIES DERIVED FROM A DIMAGNESYLAMINE SOLUTION SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM,DAVIS,CA 95616. NR 6 TC 20 Z9 20 U1 0 U2 2 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD MAY 18 PY 1994 VL 33 IS 9 BP 1000 EP 1001 DI 10.1002/anie.199410001 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NM384 UT WOS:A1994NM38400023 ER PT J AU LORIGAN, GA BRITT, RD KIM, JH HILLE, R AF LORIGAN, GA BRITT, RD KIM, JH HILLE, R TI ELECTRON-SPIN ECHO ENVELOPE MODULATION SPECTROSCOPY OF THE MOLYBDENUM CENTER OF XANTHINE-OXIDASE SO BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS LA English DT Article DE ESEEM; XANTHINE OXIDASE; VERY RAPID EPR SIGNAL; DESULFO INHIBITED EPR SIGNAL; EPR ID PARAMAGNETIC-RESONANCE SPECTROSCOPY; RAY ABSORPTION-SPECTROSCOPY; RELEVANT ANALOG COMPLEXES; OXYGEN-EVOLVING COMPLEX; WATER; MILK; COFACTOR; EXAFS; MECHANISM; SITES AB The pulsed EPR technique of electron spin echo envelope modulation (ESEEM) has been utilized to examine both the 'very rapid' and 'desulfo inhibited' Mo(V) signals of xanthine oxidase in order to probe for magnetic interactions with nitrogen, phosphorus, and hydrogen nuclei. No N-14 modulation is observed in the 'desulfo inhibited' EPR signal, indicating that histidine is unlikely to be a ligand to molybdenum. Strong N-14 modulation is observed in the 'very rapid' EPR signal formed with 2-hydroxy-6-methylpurine substrate bound to molybdenum. We interpret this modulation as arising from nitrogens of the bound purine substrate. This interpretation is consistent with the present evidence indicating that the purine ring present in the species giving rise to the 'very rapid' EPR signal is coordinated to the molybdenum center through the catalytically introduced hydroxyl group. No modulation is observed from non-exchangeable deuterons in experiments performed with deuterated 2-hydroxy-6-methylpurine. Given the signal-to-noise level of the spectra, the lack of modulation indicates that each of the substrate methyl group deuterons is greater than 4.9 Angstrom from the Mo(V). The deuteron removed from the C-8 position in the binding of the substrate is also exchanged to a site or sites greater than 4.9 Angstrom from the Mo(V) in the time-course of sample preparation. Moderately deep deuteron modulation arises from exchangeable sites. A large portion of this modulation can be accounted for by the exchangeable N, deuteron of the 2-hydroxy-6-methylpurine substrate, which we estimate to be approximately 3.2 Angstrom from the molybdenum. Additional exchangeable deuterons on the protein or within the buffer must be present within 5 Angstrom of the molybdenum to account for the remaining modulation. No modulation from weakly-coupled P-31 nuclei is observed in either the 'desulfo inhibited' or 'very rapid' EPR signal. C1 LAWRENCE LIVERMORE NATL LAB, DEPT CHEM, DAVIS, CA 95616 USA. OHIO STATE UNIV, DEPT MED BIOCHEM, COLUMBUS, OH 43210 USA. FU NIAMS NIH HHS [AR 38917]; NIGMS NIH HHS [1 R29 GM48242-01] NR 51 TC 30 Z9 31 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0005-2728 EI 0006-3002 J9 BBA-BIOENERGETICS JI Biochim. Biophys. Acta-Bioenerg. PD MAY 18 PY 1994 VL 1185 IS 3 BP 284 EP 294 DI 10.1016/0005-2728(94)90243-7 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NN041 UT WOS:A1994NN04100004 PM 8180233 ER PT J AU HASEGAWA, T LI, ZW PARKIN, S HOPE, H MCMULLAN, RK KOETZLE, TF TAUBE, H AF HASEGAWA, T LI, ZW PARKIN, S HOPE, H MCMULLAN, RK KOETZLE, TF TAUBE, H TI DETERMINATION OF THE STRUCTURE OF [OS(ETA(2)-H-2)EN(2)CH(3)CO(2)]PF6 BY X-RAY AND NEUTRON-DIFFRACTION SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; H-H BOND; TRANSITION-METALS; DIHYDROGEN COMPLEXES; H-2; COORDINATION; EQUILIBRIUM; DIHYDRIDE AB The structure of [Os(eta(2)-H-2)en(2)CH(3)CO(2)]PF6 (1) has been studied by X-ray diffraction at 120 K and neutron diffraction at 165 K. Compound 1 belongs to a series of dihydrogen complexes of osmium(II) amines, exhibiting an extensive range in the strength of the H-H interaction as judged by the wide variation in observed JH-D coupling constants. The ethylenediamine ligands in 1 have a trans arrangement. The H-2 and the acetate ligands occupy positions on opposite sides of the OsN4 plane, giving overall approximately octahedral coordination. Consistent with the relatively low J(H-D) value (9.0 Hz), the H-H distance in 1, 1.34(2) Angstrom as determined by neutron diffraction, is unusually long and approaches that of 1:357(7) Angstrom found in the polyhydride ReH7{P(p-tolyl)(3)}(2). It is presumed that 1 may represent an intermediate stage in the oxidative addition of dihydrogen at transition-metal centers. The Os-H distances in 1, 1.59(1) Angstrom and 1.60(2) Angstrom, are shorter than those in the classical osmium polyhydride OsH4(PMe(2)Ph)(3) (mean Os-H 1.659(3) W) lending support to the assertion that the Os(eta(2)-H-2) interaction is relatively strong. Crystal data: C6H19F6N4O2OSP, fw 514.4, monoclinic, P2(1)/n, Z = 4, a = 11.671(2) Angstrom, b = 10.639(2) Angstrom, c = 11.775(2) Angstrom, beta = 96.02(1)degrees at 165 K, d(calc) = 2.706 g cm(-1). Structure analysis: (X-ray) R(F) = 0.041 for 1603 reflections (F > 4 sigma(F)); (neutron) R(F) = 0.088 for 1897 reflections (F-2 > sigma(F-2)). C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP HASEGAWA, T (reprint author), STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305, USA. RI Parkin, Sean/E-7044-2011; Parkin, Stuart/D-2521-2012 NR 36 TC 75 Z9 75 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 18 PY 1994 VL 116 IS 10 BP 4352 EP 4356 DI 10.1021/ja00089a024 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA NM988 UT WOS:A1994NM98800024 ER PT J AU JAMIESON, AC KIM, SH WELLS, JA AF JAMIESON, AC KIM, SH WELLS, JA TI IN-VITRO SELECTION OF ZINC FINGERS WITH ALTERED DNA-BINDING SPECIFICITY SO BIOCHEMISTRY LA English DT Article ID SITE-DIRECTED MUTAGENESIS; CRYSTAL-STRUCTURE; PROTEIN; RESOLUTION; RECOGNITION; SEQUENCES; HORMONE; DOMAINS; COMPLEX; PHAGE AB We have used random mutagenesis and phage display to alter the DNA-binding specificity of Zif268, a transcription factor that contains three zinc finger domains. Four residues in the helix of finger 1 of Zif268 that potentially mediate DNA binding were identified from an X-ray structure of the Zif268-DNA complex. A library was constructed in which these residues were randomly mutated and the Zif268 variants were fused to a truncated version of the gene III coat protein on the surface of M13 filamentous phage particles. The phage displayed the mutant proteins in a monovalent fashion and were sorted by repeated binding and elution from affinity matrices containing different DNA sequences. When the matrix contained the natural nine base pair operator sequence 5'-GCG-TGG-GCG-3', native-like zinc fingers were isolated. New finger 1 variants were found by sorting with two different operators in which the singly modified triplets, GTG and TCG, replaced the native finger 1 triplet, GCG. Overall, the selected finger 1 variants contained a preponderance of polar residues at the four sites. Interestingly, the net charge of the four residues in any selected finger never deviated more that one unit from neutrality despite the fact that about half the variants contained three or four charged residues over the four sites. Measurements of the dissociation constants for two of these purified finger 1 variants by gel-shift assay showed their specificities to vary over a 10-fold range, with the greatest affinity being for the DNA binding site for which they were sorted. We were unable to enrich for clones that bind to five other binding sites (ACG, CCG, CGC, ATA, and TAT), suggesting modification of just these four residues in finger 1 may not allow it to adapt to all DNA binding sites. The studies show it is possible to isolate zinc fingers by phage display that distinguish operator sequences that differ by a single base change. Moreover, such selection methods should aid in clarifying rules for zinc finger-DNA recognition. C1 GENENTECH INC, DEPT PROT ENGN, San Francisco, CA 94080 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RI Wells, Jim/O-9854-2016 FU NIAID NIH HHS [AI30725] NR 26 TC 190 Z9 192 U1 1 U2 8 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 17 PY 1994 VL 33 IS 19 BP 5689 EP 5695 DI 10.1021/bi00185a004 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NM269 UT WOS:A1994NM26900004 PM 8180194 ER PT J AU KING, JA VOLLHARDT, KPC AF KING, JA VOLLHARDT, KPC TI THERMALLY AND PHOTOCHEMICALLY INDUCED VINYL-HYDROGEN ACTIVATION OF [ETA-4-1,2-3,4-(TRANS-1,3,5-HEXATRIENE)](ETA-5-CYCLOPENTADIENYL)COBALT - REGIOSPECIFIC AND STEREOSPECIFIC HYDROGEN MIGRATIONS SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article DE COBALT; PHOTOCHEMISTRY; HYDROGEN MIGRATION; BOND ACTIVATION; THERMOCHEMISTRY; METALLOCARBENE ID RAY CRYSTAL-STRUCTURE; C-H BONDS; TRICARBONYL COMPLEXES; TRANSITION-METALS; CARBENE COMPLEXES; CLUSTER COMPLEXES; METHYLENE BRIDGE; LIGANDS; ALKYNES; CHEMISTRY AB [Eta4-1,2:3,4-(trans-1,3,5-hexatriene)](eta5-cyclopentadienyl)cobalt (3) undergoes dimerization to form a flyover carbene, 5, with concomitant elimination of one equivalent of trans-1,3,5-hexatriene. Structure 5 thermally rearranges via a metal-mediated [1,5]-H shift to carbene 6: E(a) = 29.1 +/- 0.4 kcal mol-1, log A = 11.6 +/- 0.6. The structures of 5 and 6 were confirmed by single crystal X-ray determination. Low temperature irradiation of 6 generates 13 which undergoes a thermally induced reversion to 6: E(a) = 19.4 +/- 0.9 kcal mol-1, log A = 10.0 +/- 1.3. Deuterium labeling studies indicate the mechanisms involved in these C-H transformations are intramolecular, regio-, and stereospecific. The chemical study of this system is extended to include a variety of homologous CpCo(triene) complexes. A comparison between the triene approach to the formation of these flyover pentadienyl carbenes and direct carbene addition is described. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP KING, JA (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 90 TC 8 Z9 8 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 17 PY 1994 VL 470 IS 1-2 BP 207 EP 222 DI 10.1016/0022-328X(94)80169-X PG 16 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA NL346 UT WOS:A1994NL34600028 ER PT J AU TAKEYA, H PECHARSKY, VK GSCHNEIDNER, KA MOORMAN, JO AF TAKEYA, H PECHARSKY, VK GSCHNEIDNER, KA MOORMAN, JO TI NEW-TYPE OF MAGNETOCALORIC EFFECT - IMPLICATIONS ON LOW-TEMPERATURE MAGNETIC REFRIGERATION USING AN ERICSSON CYCLE SO APPLIED PHYSICS LETTERS LA English DT Article ID GADOLINIUM COMPOUNDS; HEAT-CAPACITY AB The low-temperature, high magnetic field heat capacity (1.5 to 70 K and 0 to 9.85 T), dc and ac magnetic behaviors of the compound (Gd0.54Er0.46)AlNi show that field-induced magnetic entropy change is significant and almost constant over the temperature region of approximately 15 to approximately 45 K. The resulting temperature dependence of the magnetocaloric effect, nearly constant over a 30+ K temperature range, is unprecedented (most magnetic materials have a caretlike shape temperature dependence). These data show that (Gd0.54Er0.46)AlNi can be used as an effective active magnetic regenerator material for an Ericsson-cycle magnetic refrigerator, and could substitute for complex composite layered materials suggested earlier. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. NR 7 TC 56 Z9 57 U1 2 U2 12 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 16 PY 1994 VL 64 IS 20 BP 2739 EP 2741 DI 10.1063/1.111459 PG 3 WC Physics, Applied SC Physics GA NL618 UT WOS:A1994NL61800041 ER PT J AU BELK, MC LYDEARD, C AF BELK, MC LYDEARD, C TI EFFECT OF GAMBUSIA-HOLBROOKI ON A SIMILAR-SIZED, SYNTOPIC POECILIID, HETERANDRIA-FORMOSA - COMPETITOR OR PREDATOR SO COPEIA LA English DT Article ID RESOURCE UTILIZATION AB We examined the effect of eastern mosquitofish, Gambusia holbrooki, on least killifish, Heterandria formosa, two similar-sized members of the family Poeciliidae, to determine which form of interaction was most important-competition or predation. Experimental populations were established in replicate mesocosms (wading pools), and growth and demographic characteristics of H. formosa populations were examined in the presence and absence of G. holbrooki. In pools with G. holbrooki, populations of H. formosa were small and significantly skewed toward large-bodied females. and relative abundance of males and juveniles was reduced. In populations of H. formosa alone, sex ratios and adult to juvenile ratios were about 1:1, individual adult female body sizes were smaller, and populations were large. This combination of population characteristics coincides with those predicted by a strong predator-prey model. We suggest that, even though these species are similar in adult size, diet, and habitat use, the dominant interaction between them, rather than competition, is size-selective predation by large G. holbrooki on small H. formosa. However, in natural populations, predation on G. holbrooki by other species may ameliorate the strong effects on H. formosa observed in this study. C1 UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. UNIV GEORGIA, DEPT ZOOL, ATHENS, GA 30602 USA. AUBURN UNIV, DEPT ZOOL & WILDLIFE SCI, AUBURN, AL 36849 USA. NR 39 TC 21 Z9 22 U1 0 U2 6 PU AMER SOC ICHTHYOLOGISTS & HERPETOLOGISTS PI MIAMI PA MAUREEN DONNELLY, SECRETARY FLORIDA INT UNIV BIOLOGICAL SCIENCES, 11200 SW 8TH STREET, MIAMI, FL 33199 USA SN 0045-8511 EI 1938-5110 J9 COPEIA JI Copeia PD MAY 16 PY 1994 IS 2 BP 296 EP 302 PG 7 WC Zoology SC Zoology GA NM667 UT WOS:A1994NM66700004 ER PT J AU HOYER, LL MAGEE, BB RIKKERINK, EHA SCHERER, S AF HOYER, LL MAGEE, BB RIKKERINK, EHA SCHERER, S TI THE ARG4 GENE OF CANDIDA-ALBICANS SO GENE LA English DT Note DE ARGININE; ARGININOSUCCINATE LYASE; AUXOTROPHS; ARG57; ARG1OO; FUMARATE LYASE SIGNATURE SEQUENCE; COMPLEMENTATION; SPHEROPLAST FUSION; SACCHAROMYCES CEREVISIAE ID AMINO-ACID BIOSYNTHESIS; CANDIDA-ALBICANS; SACCHAROMYCES-CEREVISIAE; YEAST; COMPLEMENTATION; AUXOTROPHS; SEQUENCE AB The DNA sequence of a Candida albicans genomic fragment known to complement the arginine mutation designated arg57 in strain 1006 contains an ORF of 1404 nucleotides (nt) predicting a protein of 468 amino acids (aa). Database searches indicated that the deduced protein shares 75% identity and 85% similarity with the ARG4 protein of Saccharomyces cerevisiae. Analysis of the percent aa identity between C. albicans and S. cerevisiae sequences included in available databases suggested these values are within the range expected for biosynthetic enzymes from the two organisms which share similar function. Experiments to isolate C. albicans ARG4 by complementation in an arg4 strain of S. cerevisiae yielded a plasmid (pARG4-1) with a restriction map identical to that of the sequenced clone. From these data, we conclude that the gene previously designated ARG57 is in fact ARG4 encoding the enzyme argininosuccinate lyase (ASL). These results were unexpected, since ARG57 had been localized to chromosome 7, while a mutation causing an ASL deficiency had been linked to ade1, which is on chromosome R. Transformation of C. albicans strains with pARG4-1 indicated it complemented the arginine auxotrophy in strains TMSU221 and 1435, a derivative of 1006. Examination of commonly utilized C. albicans arginine auxotrophs by spheroplast fusion analysis indicated these strains comprise two complementation groups: one consisting of 1006 and TMSU221, which are arg4, and the other of A642, hOG318, hOG357, FC18-6 and WC-5-4, which possess an undefined defect in the arginine biosynthetic pathway which we designate arg100. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. UNIV MINNESOTA,DEPT GENET & CELL BIOL,ST PAUL,MN 55108. RI Rikkerink, Erik/B-5752-2011 OI Rikkerink, Erik/0000-0003-4682-5078 FU NIAID NIH HHS [AI23850, AI16567] NR 18 TC 16 Z9 19 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1119 J9 GENE JI Gene PD MAY 16 PY 1994 VL 142 IS 2 BP 213 EP 218 DI 10.1016/0378-1119(94)90263-1 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA NP201 UT WOS:A1994NP20100008 PM 8194754 ER PT J AU COLUMBIA, MR THIEL, PA AF COLUMBIA, MR THIEL, PA TI THE INTERACTION OF FORMIC-ACID WITH TRANSITION-METAL SURFACES, STUDIED IN ULTRAHIGH-VACUUM SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Review ID ELECTRON-ENERGY LOSS; ABSORPTION FINE-STRUCTURE; CATALYTIC DECOMPOSITION; FLASH DESORPTION; ATOMIC OXYGEN; PHOTOELECTRON DIFFRACTION; VIBRATIONAL SPECTROSCOPY; AZIMUTHAL ORIENTATION; REACTION-KINETICS; PD(100) SURFACES AB In this report, we review the interaction of formic acid (HCOOH) with transition metal surfaces, as studied with the tools of modern surface science in an ultrahigh vacuum environment. Our goal is to provide a broad overview of the fundamental adsorption and decomposition processes which HCOOH undergoes at the surfaces of these metals. The metal substrates include Cu, Fe, W, Ni, Ru, Ag, Pt, Au, Rh and Pd. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 100 TC 81 Z9 80 U1 5 U2 31 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 1572-6657 EI 1873-2569 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAY 16 PY 1994 VL 369 IS 1-2 BP 1 EP 14 DI 10.1016/0022-0728(94)87077-2 PG 14 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA NN713 UT WOS:A1994NN71300001 ER PT J AU LU, TH YU, XJ DONG, SJ ZHOU, CL YE, SY COTTON, TM AF LU, TH YU, XJ DONG, SJ ZHOU, CL YE, SY COTTON, TM TI DIRECT ELECTROCHEMICAL REACTIONS OF CYTOCHROME-C AT IODIDE-MODIFIED ELECTRODES SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID MODIFIED GOLD ELECTRODES; REDOX REACTION-MECHANISM; PLATINUM-ELECTRODES; RAMAN-SPECTROSCOPY; MERCURY-ELECTRODE; INDIUM OXIDE; PROTEINS; SURFACE; ADSORPTION; PROMOTERS AB Quasi-reversible and direct electron transfer was observed between an iodide-modified Au electrode and cytochrome c, as well as between cytochrome c in an iodide-containing solution and a bare Au electrode. The results suggest that an electrostatic interaction between cytochrome c and the iodide-modified electrode surface plays an important role in the electrochemical response. A mechanism is proposed which involves adsorption of cytochrome c on the surface of the iodide-modified electrode, followed by rapid desorption after the electron transfer process. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. ACAD SINICA,CHANGCHUN INST APPL CHEM,ELECTROANALYT CHEM LAB,CHANGCHUN 130022,PEOPLES R CHINA. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 61 TC 36 Z9 37 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAY 16 PY 1994 VL 369 IS 1-2 BP 79 EP 86 DI 10.1016/0022-0728(94)87084-5 PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA NN713 UT WOS:A1994NN71300008 ER PT J AU DOVER, CB GAL, A MILLENER, DJ AF DOVER, CB GAL, A MILLENER, DJ TI ON THE PRODUCTION AND DECAY OF STRANGENESS S=-2 HYPERNUCLEI SO NUCLEAR PHYSICS A LA English DT Article ID LAMBDA-LAMBDA-HYPERNUCLEI; H-PARTICLE; WEAK DECAY; SPECTROSCOPY; SEARCH; DIBARYON; NUCLEI AB We examine the production and decay mechanisms of doubly strange S = -2 hypernuclei, focusing on reactions induced by kaons. The production of XI and XI* (1530) hyperons in (K-, K+) reactions on nuclear targets is considered, including the possibility of observably narrow XI single-particLe bound states. We present estimates of the baryon (n, p, LAMBDA) decay widths of XI states, based on calculated XIN --> LAMBDALAMBDA mixing amplitudes, which indicate that such excitations could be considerably narrower in light nuclei than the estimated XI decay width of 5-10 MeV in nuclear matter. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP DOVER, CB (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 40 TC 37 Z9 37 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 16 PY 1994 VL 572 IS 1 BP 85 EP 111 DI 10.1016/0375-9474(94)90423-5 PG 27 WC Physics, Nuclear SC Physics GA NM362 UT WOS:A1994NM36200011 ER PT J AU ABE, K ABT, I ASH, WW ASTON, D BACCHETTA, N BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BATTISTON, R BAZARKO, AO BEAN, A BELCINSKI, RJ BENDAVID, R BENVENUTI, AC BIASINI, M BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CARR, J CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHADWICK, GB CHEN, L CHURCH, E CLAUS, R COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYLE, PA COYNE, DG DOLIVEIRA, A DAMERELL, CJS DASU, S DESANGRO, R DESIMONE, P DESIMONE, S DELLORSO, R DU, PYC DUBOIS, R DUBOSCQ, JE EISENTEIN, BI ELIA, R ERDOS, E FAN, C FARHAT, B FERO, MJ FREY, R FRIEDMAN, JI FURUNO, K GALLINARO, M GILLMAN, A GLADDING, G GONZALEZ, S HALLEWELL, GD HANSLKOZANECKA, T HART, EL HASEGAWA, K HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HITLIN, DG HONMA, A HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y IZEN, JM JACQUES, P JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KELSEY, MH KENDALL, HW KIM, HY KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS KWON, Y LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MAJID, WA MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASUDA, H MAZZUCATO, E MCGOWAN, JF MCHUGH, S MCKEMEY, AK MEADOWS, BT MELLOR, DJ MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MULLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OSBORNE, LS PANVINI, RS PARK, H PAULUZZI, M PAVEL, TJ PERRIER, F PERUZZI, I PESCARA, L PETRADZA, M PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE RICHMAN, JD ROCHESTER, LS ROSENSON, L ROTHBERG, JE ROUSAKOV, S ROWSON, PC RUSSELL, JJ SAEZ, P SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHULTZ, D SCHUMM, BA SEIDEN, A SEN, S SERVOLI, L SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SHYPIT, RL SIMOPOULOS, C SMITH, SR SNYDER, JA SOKOLOFF, MD STAMER, P STEINER, H STEINER, R STOCKDALE, IE STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TECCHIO, M THALER, JJ TOGE, N TORRENCE, E TURCOTTE, M TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, S WAITE, AP WATTS, SJ WEIDEMANN, AW WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WITHERELL, MS WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHOU, J ZOLOTOREV, M ZUCCHELLI, P AF ABE, K ABT, I ASH, WW ASTON, D BACCHETTA, N BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BATTISTON, R BAZARKO, AO BEAN, A BELCINSKI, RJ BENDAVID, R BENVENUTI, AC BIASINI, M BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CARR, J CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHADWICK, GB CHEN, L CHURCH, E CLAUS, R COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYLE, PA COYNE, DG DOLIVEIRA, A DAMERELL, CJS DASU, S DESANGRO, R DESIMONE, P DESIMONE, S DELLORSO, R DU, PYC DUBOIS, R DUBOSCQ, JE EISENTEIN, BI ELIA, R ERDOS, E FAN, C FARHAT, B FERO, MJ FREY, R FRIEDMAN, JI FURUNO, K GALLINARO, M GILLMAN, A GLADDING, G GONZALEZ, S HALLEWELL, GD HANSLKOZANECKA, T HART, EL HASEGAWA, K HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HITLIN, DG HONMA, A HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y IZEN, JM JACQUES, P JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KELSEY, MH KENDALL, HW KIM, HY KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS KWON, Y LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MAJID, WA MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASUDA, H MAZZUCATO, E MCGOWAN, JF MCHUGH, S MCKEMEY, AK MEADOWS, BT MELLOR, DJ MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MULLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OSBORNE, LS PANVINI, RS PARK, H PAULUZZI, M PAVEL, TJ PERRIER, F PERUZZI, I PESCARA, L PETRADZA, M PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE RICHMAN, JD ROCHESTER, LS ROSENSON, L ROTHBERG, JE ROUSAKOV, S ROWSON, PC RUSSELL, JJ SAEZ, P SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHULTZ, D SCHUMM, BA SEIDEN, A SEN, S SERVOLI, L SHAEVITZ, MH SHANK, JT SHAPIRO, G SHAPIRO, SL SHERDEN, DJ SHYPIT, RL SIMOPOULOS, C SMITH, SR SNYDER, JA SOKOLOFF, MD STAMER, P STEINER, H STEINER, R STOCKDALE, IE STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TECCHIO, M THALER, JJ TOGE, N TORRENCE, E TURCOTTE, M TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDIER, R VERDINI, PG WAGNER, S WAITE, AP WATTS, SJ WEIDEMANN, AW WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WITHERELL, MS WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHOU, J ZOLOTOREV, M ZUCCHELLI, P TI MEASUREMENT OF THE CHARGED MULTIPLICITY OF Z(0)-]B(B)OVER-BAR EVENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRONIC DECAYS; JETS; Z0 AB Using an impact parameter tag to select an enriched sample of Z0 --> bbBAR events, we have measured the difference between the average charged multiplicity of Z0 --> bbBAR and Z0 --> hadrons to be n(b)BAR-n(had)BAR=2.24 +/- 0.30(stat) +/- 0.33(syst) tracks per event. From this, we have derived n(b)BAR-n(uds)BAR=3.31 +/- 0.41 +/- 0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that n(b)BAR-n(uds)BAR depends on energy. This result is in agreement with a precise prediction of perturbative QCD, and supports the notion that QCD remains asymptotically free down to the scale M(b)2. C1 ADELPHI UNIV,GARDEN CITY,NY 11530. BOSTON UNIV,BOSTON,MA 02215. BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND. CALTECH,PASADENA,CA 91125. COLUMBIA UNIV,NEW YORK,NY 10027. IST NAZL FIS NUCL,NAZL FRASCATI LAB,I-00044 FRASCATI,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-44100 FERRARA,ITALY. UNIV PADUA,I-35100 PADUA,ITALY. IST NAZL FIS NUCL,I-35100 PADUA,ITALY. IST NAZL FIS NUCL,I-06100 PERUGIA,ITALY. IST NAZL FIS NUCL,I-56100 PISA,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV PISA,I-56100 PISA,ITALY. MIT,CAMBRIDGE,MA 02139. NAGOYA UNIV,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV BRITISH COLUMBIA,VANCOUVER V6T 2A6,BC,CANADA. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV COLORADO,BOULDER,CO 80309. UNIV GENOA,I-16146 GENOA,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MASSACHUSETTS,AMHERST,MA 01003. UNIV OREGON,EUGENE,OR 97403. UNIV PERUGIA,I-06100 PERUGIA,ITALY. UNIV TENNESSEE,KNOXVILLE,TN 37996. UNIV VICTORIA,VICTORIA V8W 2Y2,BC,CANADA. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV WISCONSIN,MADISON,WI 53706. VANDERBILT UNIV,NASHVILLE,TN 37235. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, K (reprint author), TOHOKU UNIV,SENDAI,MIYAGI 980,JAPAN. RI Servoli, Leonello/E-6766-2012; de Sangro, Riccardo/J-2901-2012; de Simone, Patrizia/J-3549-2012; Perrier, Frederic/A-5953-2011; Cavalli-Sforza, Matteo/H-7102-2015; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016 OI Servoli, Leonello/0000-0003-1725-9185; de Sangro, Riccardo/0000-0002-3808-5455; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636 NR 21 TC 21 Z9 21 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 16 PY 1994 VL 72 IS 20 BP 3145 EP 3149 DI 10.1103/PhysRevLett.72.3145 PG 5 WC Physics, Multidisciplinary SC Physics GA NL609 UT WOS:A1994NL60900004 ER PT J AU CEDERWALL, B JANSSENS, RVF BRINKMAN, MJ LEE, IY AHMAD, I BECKER, JA CARPENTER, MP CROWELL, B DELEPLANQUE, MA DIAMOND, RM DRAPER, JE DUYAR, C FALLON, P FARRIS, LP HENRY, EA HENRY, RG HUGHES, JR KHOO, TL LAURITSEN, T MACCHIAVELLI, AO RUBEL, E STEPHENS, FS STOYER, MA SATULA, W WIEDENHOEVER, I WYSS, R AF CEDERWALL, B JANSSENS, RVF BRINKMAN, MJ LEE, IY AHMAD, I BECKER, JA CARPENTER, MP CROWELL, B DELEPLANQUE, MA DIAMOND, RM DRAPER, JE DUYAR, C FALLON, P FARRIS, LP HENRY, EA HENRY, RG HUGHES, JR KHOO, TL LAURITSEN, T MACCHIAVELLI, AO RUBEL, E STEPHENS, FS STOYER, MA SATULA, W WIEDENHOEVER, I WYSS, R TI NEW FEATURES OF SUPERDEFORMED BANDS IN HG-194 SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEI; ALIGNMENT; INERTIA AB Two new features of superdeformed (SD) bands in the A almost-equal-to 190 region emerge from a study of Hg-194 with the Gammasphere detector array. A decrease of the dynamic moment of inertia is observed for rotational frequencies HBARomega greater-than-or-equal-to 0.4 MeV, confirming long standing expectations based on mean field calculations with pairing. Evidence for a small staggering in the SD transition energies is also observed, suggesting the presence of terms with fourfold symmetry in the SD Hamiltonian. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE,GERMANY. UNIV WARSAW,INST THEORET PHYS,PL-00681 WARSAW,POLAND. MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN. ROYAL INST TECHNOL,DEPT PHYS,S-10044 STOCKHOLM 70,SWEDEN. RP CEDERWALL, B (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Cederwall, Bo/M-3337-2014; Carpenter, Michael/E-4287-2015 OI Cederwall, Bo/0000-0003-1771-2656; Carpenter, Michael/0000-0002-3237-5734 NR 26 TC 133 Z9 134 U1 0 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 16 PY 1994 VL 72 IS 20 BP 3150 EP 3153 DI 10.1103/PhysRevLett.72.3150 PG 4 WC Physics, Multidisciplinary SC Physics GA NL609 UT WOS:A1994NL60900005 ER PT J AU PERAKIS, IE CHEMLA, DS AF PERAKIS, IE CHEMLA, DS TI AC STARK-EFFECT OF THE FERMI-EDGE SINGULARITY - OBSERVATION OF EXCITONIC POLARONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID OPTICAL-SPECTRA; QUANTUM WELLS; SEMICONDUCTORS; FEMTOSECOND; SYSTEM; HOLE AB We introduce a new theoretical approach to describe the virtual excitation of Fermi edge singularities in modulation-doped quantum wells. We discuss how ultrashort laser pulses renormalize the effective masses, band-gap, transition matrix elements, and interactions of doped semiconductors. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP PERAKIS, IE (reprint author), RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08855, USA. RI Perakis, Ilias/G-9186-2011 NR 27 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 16 PY 1994 VL 72 IS 20 BP 3202 EP 3205 DI 10.1103/PhysRevLett.72.3202 PG 4 WC Physics, Multidisciplinary SC Physics GA NL609 UT WOS:A1994NL60900018 ER PT J AU VLASKOVLASOV, VK DOROSINSKII, LA POLYANSKII, AA NIKITENKO, VI WELP, U VEAL, BW CRABTREE, GW AF VLASKOVLASOV, VK DOROSINSKII, LA POLYANSKII, AA NIKITENKO, VI WELP, U VEAL, BW CRABTREE, GW TI STUDY OF THE INFLUENCE OF INDIVIDUAL TWIN BOUNDARIES ON THE MAGNETIC-FLUX PENETRATION IN YBA2CU3O7-DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID DISK-SHAPED SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; SINGLE-CRYSTALS; CRITICAL STATE; INPLANE ANISOTROPY; VORTEX STRUCTURE; CURRENTS; YBACUO; FILMS AB The direct observation of the magnetic flux motion near individual twin boundaries in YBa2Cu3O7-delta shows that twin boundaries are not channels for easy flux penetration but planar pinning barriers near which vortices are concentrated, giving rise to guided vortex motion. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP VLASKOVLASOV, VK (reprint author), CHERNOGOLOVKA SOLID STATE PHYS INST,142432 CHERNOGOLOVKA,RUSSIA. RI Dorosinskii, Lev/J-3929-2015 OI Dorosinskii, Lev/0000-0002-5434-1009 NR 37 TC 93 Z9 93 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 16 PY 1994 VL 72 IS 20 BP 3246 EP 3249 DI 10.1103/PhysRevLett.72.3246 PG 4 WC Physics, Multidisciplinary SC Physics GA NL609 UT WOS:A1994NL60900029 ER PT J AU SEN, S CAI, ZX MAHANTI, SD AF SEN, S CAI, ZX MAHANTI, SD TI LONG-TIME DYNAMICS VIA DIRECT SUMMATION OF INFINITE CONTINUED FRACTIONS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Article ID RELAXATION; CHAIN; SPIN C1 BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973. MICHIGAN STATE UNIV,DEPT PHYS,E LANSING,MI 48824. RP SEN, S (reprint author), SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260, USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 16 PY 1994 VL 72 IS 20 BP 3287 EP 3287 DI 10.1103/PhysRevLett.72.3287 PG 1 WC Physics, Multidisciplinary SC Physics GA NL609 UT WOS:A1994NL60900040 ER PT J AU BARNHART, DM CLARK, DL WATKIN, JG AF BARNHART, DM CLARK, DL WATKIN, JG TI BIS(2,6-DI-TERT-BUTYLPHENOLATO-KAPPA-O)TIN SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The title compound, [Sn(C14H21O)2] (I), contains a two-coordinate tin metal center with Sn-O distances of 2.003 (3) and 2.044 (3) angstrom, and an O-Sn-O angle of 88.8 (1)degrees. RP BARNHART, DM (reprint author), LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,MAIL STOP C346,LOS ALAMOS,NM 87545, USA. RI Clark, David/A-9729-2011 NR 3 TC 18 Z9 18 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD MAY 15 PY 1994 VL 50 BP 702 EP 704 DI 10.1107/S0108270193010261 PN 5 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA NM386 UT WOS:A1994NM38600023 ER PT J AU ESSER, BK VOLPE, A KENNEALLY, JM SMITH, DK AF ESSER, BK VOLPE, A KENNEALLY, JM SMITH, DK TI PRECONCENTRATION AND PURIFICATION OF RARE-EARTH ELEMENTS IN NATURAL-WATERS USING SILICA-IMMOBILIZED 8-HYDROXYQUINOLINE AND A SUPPORTED ORGANOPHOSPHORUS EXTRACTANT SO ANALYTICAL CHEMISTRY LA English DT Article ID PLASMA MASS-SPECTROMETRY; TRACE-METALS; CHELATION CHROMATOGRAPHY; SEAWATER; COMPLEXATION; ADSORPTION; PACIFIC; GEL AB 8-Hydroxyquinoline immobilized on silica gel (silica-8HQ) and RE-Spec, a supported organophosphorus extractant, were used to preconcentrate and purify rare earth elements (REEs) from natural waters prior to their determination by isotope-dilution inductively coupled plasma mass spectrometry (ID-ICPMS). Preconcentration onto silica-8HQ is applicable to a wide range of trace metals, making it suitable for multielement ID-ICPMS studies, The silica-8HQ, RE-Spec technique concentrates REEs from 1 L or less of water into 1 mL of salt-free 0.1% nitric acid. The technique is rapid and has high REE yields (>80%) and low REE blanks (<2-6 pg). In addition, Ba separation is high, allowing determination of La and Eu by ID-less than or equal to 1300 pg of Ba is present in the final concentrates of sample solutions initially containing >4 mu g of Ba. RP ESSER, BK (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,L-232,LIVERMORE,CA 94550, USA. RI Esser, Bradley/G-4283-2010 OI Esser, Bradley/0000-0002-3219-4298 NR 24 TC 62 Z9 63 U1 3 U2 14 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 1994 VL 66 IS 10 BP 1736 EP 1742 DI 10.1021/ac00082a022 PG 7 WC Chemistry, Analytical SC Chemistry GA NL329 UT WOS:A1994NL32900025 ER PT J AU ROSENZWEIG, Z YEUNG, ES AF ROSENZWEIG, Z YEUNG, ES TI LASER-BASED PARTICLE-COUNTING MICROIMMUNOASSAY FOR THE ANALYSIS OF SINGLE HUMAN ERYTHROCYTES SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; INDUCED FLUORESCENCE DETECTION; LATEX AGGLUTINATION; NATIVE PROTEINS; IMMUNOASSAY; ANTIBODIES; CHROMATOGRAPHY; HORMONE; ANTIGEN; SERA AB A particle-counting immunoassay system for ultrasensitive analysis of proteins in a capillary environment has been developed. The assay is based on the agglutination of antibody-coated particles in the presence of an antigen (usually a protein). The particles were electrophoretically migrated in a 20-mu m-i.d. capillary past a detection window where a laser beam irradiates continuously. The light scattering events generated by the agglutinated particles were counted while those produced by unreacted particles were electronically rejected. Glucose-6-phosphate dehydrogenase (G6PDH) was chosen as a test compound for the off-column as well as for the on-column versions of this method. A limit of detection of 620 molecules of G6PDH (1 zmol) was found in the on-column assay. The standard deviation between runs was similar to 6%, which is comparable to that of standard immunoassay methods. The application to the determination of G6PDH levels in individual human erythrocytes is presented. A 14-fold cell-to-cell variation was found which can be-explained by the age distribution in the red blood cells. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 43 TC 72 Z9 75 U1 0 U2 9 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 1994 VL 66 IS 10 BP 1771 EP 1776 DI 10.1021/ac00082a028 PG 6 WC Chemistry, Analytical SC Chemistry GA NL329 UT WOS:A1994NL32900031 PM 8030786 ER PT J AU RUDOLPH, M REDDY, DP FELDBERG, SW AF RUDOLPH, M REDDY, DP FELDBERG, SW TI A SIMULATOR FOR CYCLIC VOLTAMMETRIC RESPONSES SO ANALYTICAL CHEMISTRY LA English DT Article ID REDOX POLYMER-FILMS; FINITE-DIFFERENCE ALGORITHM; ELECTROCHEMICAL REACTIONS; MICRODISK ELECTRODES; DIGITAL-SIMULATION; KINETICS; MICROELECTRODES; HOPSCOTCH; EXPLICIT; OPTIMIZATION C1 RADIO LOGIC INC, NEW HAVEN, CT 06536 USA. BROOKHAVEN NATL LAB, DEPT ALLIED SCI, UPTON, NY 11973 USA. RP RUDOLPH, M (reprint author), UNIV JENA, INST ANORGAN & ANALYT CHEM, O-6900 JENA, GERMANY. NR 73 TC 191 Z9 191 U1 4 U2 23 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD MAY 15 PY 1994 VL 66 IS 10 BP A589 EP A600 DI 10.1021/ac00082a002 PG 12 WC Chemistry, Analytical SC Chemistry GA NL329 UT WOS:A1994NL32900005 ER PT J AU BURGHES, AHM INGRAHAM, SE MCLEAN, M THOMPSON, TG MCPHERSON, JD KOTEJARAI, Z CARPTEN, JD DIDONATO, CJ IKEDA, JE SURH, L WIRTH, B SARGENT, CA FERGUSONSMITH, MA FUERST, P MOYZIS, RK GRADY, DL ZERRES, K KORNELUK, R MACKENZIE, A WASMUTH, JJ AF BURGHES, AHM INGRAHAM, SE MCLEAN, M THOMPSON, TG MCPHERSON, JD KOTEJARAI, Z CARPTEN, JD DIDONATO, CJ IKEDA, JE SURH, L WIRTH, B SARGENT, CA FERGUSONSMITH, MA FUERST, P MOYZIS, RK GRADY, DL ZERRES, K KORNELUK, R MACKENZIE, A WASMUTH, JJ TI A MULTICOPY DINUCLEOTIDE MARKER THAT MAPS CLOSE TO THE SPINAL MUSCULAR-ATROPHY GENE SO GENOMICS LA English DT Article ID LINKAGE ANALYSIS; LONG ARM; CHROMOSOME-5; REGION; POLYMORPHISMS; LOCUS; 5Q13; ASSIGNMENT; INTERVAL; HUMANS AB Spinal muscular atrophy (SMA) is a common autosomal recessive disorder resulting in loss of motor neurons. The interval containing the SMA gene has been defined by linkage analysis as 5qcen-D5S435-SMA-D5S557-5qter. We have isolated a new dinucleotide repeat marker, CATT1, that lies between these two closest markers. The marker CATT1 has 16 alleles and is highly polymorphic. The marker can have 1 to 4 (or more) copies per chromosome, giving rise to individuals with up to 8 (or more) alleles. All of the subloci map between the markers D5S557 and D5S435 and lie in close proximity to one another. The marker CATT1 is linked to the SMA gene with a lod score of Z(max) = 34.42 at theta = 0 and crosses all available recombinants. Certain alleles occurred more frequently in either the SMA or normal populations, indicating significant allelic association between CATT1 and the SMA locus. Haplotype analysis combining U.S. and Canadian SMA families reveals that one haplotype group (VII) occurs significantly more frequently in the SMA population than in the normal. This confirms the allelic association of CATT1 with the SMA locus. (C) 1994 Academic Press, Inc. C1 OHIO STATE UNIV,COLL MED,DEPT MED BIOCHEM,COLUMBUS,OH 43210. OHIO STATE UNIV,COLL BIOL SCI,DEPT MOLEC GENET,COLUMBUS,OH 43210. CHILDRENS HOSP EASTERN ONTARIO,MOLEC GENET LAB,OTTAWA K1H 8L1,ON,CANADA. UNIV CALIF IRVINE,DEPT BIOCHEM,IRVINE,CA 92717. TOKAI UNIV,SCH MED,ERATO,IGSP,ISEHARA,KANAGAWA 25911,JAPAN. INST HUMAN GENET,D-53111 BONN,GERMANY. UNIV CAMBRIDGE,DEPT PATHOL,CAMBRIDGE CB2 1QP,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BURGHES, AHM (reprint author), OHIO STATE UNIV,COLL MED,DEPT NEUROL,452 MEANS HALL,1654 UPHAM DR,COLUMBUS,OH 43210, USA. RI Ingraham, Susan/B-4565-2012 NR 37 TC 51 Z9 52 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD MAY 15 PY 1994 VL 21 IS 2 BP 394 EP 402 DI 10.1006/geno.1994.1282 PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA NP161 UT WOS:A1994NP16100014 PM 8088834 ER PT J AU CHEN, DJ MARRONE, BL NGUYEN, T STACKHOUSE, M ZHAO, Y SICILIANO, MJ AF CHEN, DJ MARRONE, BL NGUYEN, T STACKHOUSE, M ZHAO, Y SICILIANO, MJ TI REGIONAL ASSIGNMENT OF A HUMAN DNA-REPAIR GENE (XRCC5) TO 2Q35 BY X-RAY HYBRID MAPPING SO GENOMICS LA English DT Note ID CHINESE-HAMSTER CELL; STRAND BREAK REPAIR; IONIZING-RADIATION; SENSITIVE MUTANTS; HUMAN-CHROMOSOMES; OVARY CELLS; LINES AB A number of human genes involved in the repair of radiation-induced DNA double-strand breaks have been identified based on the analysis of radiation-sensitive rodent mutants. Recently, one of the DSB repair genes, XRCC5, has been mapped on human chromosome 2 by concordance analysis of somatic cell hybrids and by the microcell-mediated chromosome transfer approach. For the regional mapping of the human XRCC5 gene, we have constructed a panel of X-ray hybrids and a panel of microcell mediated chromosome 2 hybrids in the mutant background that contain only fragments of human chromosome 2. By using fluorescence in situ hybridization, chromosome banding, and physical mapping of these X-ray hybrids, we have localized the human XRCC5 locus to 2q35. This result is further confirmed by a segregation analysis indicating that the radiation resistant phenotype of a repair-proficient hybrid cosegregates with the human 2q35 chromosome fragment. (C) 1994 Academic Press, Inc. C1 UNIV TEXAS,MD ANDERSON CANC CTR,DEPT MOLEC GENET,HOUSTON,TX 77030. RP CHEN, DJ (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,MS-M888,LOS ALAMOS,NM 87545, USA. RI Lujan Center, LANL/G-4896-2012 FU NCI NIH HHS [CA50519]; NIGMS NIH HHS [GM34936] NR 22 TC 26 Z9 26 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD MAY 15 PY 1994 VL 21 IS 2 BP 423 EP 427 DI 10.1006/geno.1994.1287 PG 5 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA NP161 UT WOS:A1994NP16100019 PM 8088837 ER PT J AU SCHUNK, PR RAO, RR AF SCHUNK, PR RAO, RR TI FINITE-ELEMENT ANALYSIS OF MULTICOMPONENT 2-PHASE FLOWS WITH INTERPHASE MASS AND MOMENTUM TRANSPORT SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE FREE-SURFACE; INTERPHASE MASS TRANSFER; FINITE ELEMENT 2-PHASE FLOW; COATING AB The application of the finite element method to multiphase flow problems with interphase mass and heat transfer is described. A general formulation is used that determines the position of the interfacial boundary and allows for multiple solvents, differential volatilities and concentration- and temperature-dependent thermophysical properties. Species phase change and the dramatic volume change that accompanies interphase mass transfer make implementation of the theory challenging, since these events lead to discontinuous velocities and concentrations at phase boundaries. These discontinuities are especially large in processes involving rapid evaporation or condensation. As examples we examine the effects of rapid drying on film and fibre formation of sol-gel materials, which are often laden with volatile species. RP SCHUNK, PR (reprint author), SANDIA NATL LABS,DEPT COMPUTAT FLUID DYNAM,ALBUQUERQUE,NM 87185, USA. NR 23 TC 7 Z9 7 U1 1 U2 5 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD MAY 15 PY 1994 VL 18 IS 9 BP 821 EP 842 DI 10.1002/fld.1650180903 PG 22 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA NL133 UT WOS:A1994NL13300002 ER PT J AU ANDERS, S ANDERS, A BROWN, I AF ANDERS, S ANDERS, A BROWN, I TI FOCUSED INJECTION OF VACUUM-ARC PLASMAS INTO CURVED MAGNETIC FILTERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DEPOSITION; COATINGS; DIAMOND; TRANSPORT; EROSION AB Thin films of high quality can be deposited using vacuum arc plasmas when the macroparticles which are produced along with the plasma in the cathode spots are removed by curved magnetic filters (''ducts''). In order to improve the deposition efficiency of a vacuum arc plasma source coupled to a magnetic filter, the effect of a magnetically focused plasma injection into such a filter has been investigated. Maximum plasma output was found at an optimum focusing field strength of 20-40 mT with an optimum duct bias of +20 V with respect to the anode potential (ground potential). The maximum output is by a factor of 20-30 greater than without focusing field and the duct at ground potential. This significant effect at relatively low injection field strength indicates that not only the magnetic field distribution but also the plasma current distribution is essential for an efficient plasma transport. RP ANDERS, S (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Anders, Andre/B-8580-2009; Raoux, Simone/G-3920-2016 OI Anders, Andre/0000-0002-5313-6505; NR 25 TC 42 Z9 43 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 4895 EP 4899 DI 10.1063/1.355776 PN 1 PG 5 WC Physics, Applied SC Physics GA NN732 UT WOS:A1994NN73200008 ER PT J AU ANDERS, A ANDERS, S BROWN, IG AF ANDERS, A ANDERS, S BROWN, IG TI EFFECT OF DUCT BIAS ON TRANSPORT OF VACUUM-ARC PLASMAS THROUGH CURVED MAGNETIC FILTERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CATHODE SPOT; SURFACE; SHEATH; BOUNDARY; FIELD AB The plasma output of a 90' magnetic macroparticle filter of vacuum arc plasma was monitored by a Langmuir probe as a function of bias of the duct wall and guiding magnetic field. Maximum plasma transport through the filter was found at a positive bias of about 20 V. A relatively small magnetic field of 10-30 mT is sufficient for effective guiding of the plasma, and further increase of the guiding field improves the filter efficiency only gradually. The potential of a floating duct changes from negative to positive when the guiding field is increased. This can be explained by the balance of electron and ion flux transverse to the magnetic field. Saturation in the plasma output at high guiding field (>120 mT) is observed for carbon but not for heavy elements. The transport of plasma through bent ducts is made possible by the magnetic pressure of the guiding field, and by sheath and space-charge electric fields. RP ANDERS, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Anders, Andre/B-8580-2009; Raoux, Simone/G-3920-2016 OI Anders, Andre/0000-0002-5313-6505; NR 22 TC 88 Z9 94 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 1994 VL 75 IS 10 BP 4900 EP 4905 DI 10.1063/1.355777 PN 1 PG 6 WC Physics, Applied SC Physics GA NN732 UT WOS:A1994NN73200009 ER PT J AU RUUD, JA JERVIS, TR SPAEPEN, F AF RUUD, JA JERVIS, TR SPAEPEN, F TI NANOINDENTATION OF AG NI MULTILAYERED THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HALL-PETCH RELATIONSHIP; MECHANICAL-PROPERTIES; NANOCRYSTALLINE MATERIALS; BRILLOUIN-SCATTERING; RESIDUAL-STRESS; GRAIN-SIZE; SUPERLATTICES; NICKEL; MICROHARDNESS; CU AB Nanoindentation was used to study the mechanical properties of Ag/Ni multilayered thin films. Both the hardness and the elastic modulus of the multilayered thin films had values between those for homogeneous Ag and Ni thin films. The trend in the hardness with layer repeat length can be explained by the effects of both the stress and the microstructure. No evidence for interfacial effects on hardness was found. A decrease in modulus at the smallest repeat lengths was compared with literature data on the elastic constants of Ag/Ni multilayers. C1 HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 42 TC 52 Z9 56 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 4969 EP 4974 DI 10.1063/1.355787 PN 1 PG 6 WC Physics, Applied SC Physics GA NN732 UT WOS:A1994NN73200020 ER PT J AU KURTZ, SR OLSON, JM ARENT, DJ BODE, MH BERTNESS, KA AF KURTZ, SR OLSON, JM ARENT, DJ BODE, MH BERTNESS, KA TI LOW-BAND-GAP GA0.5IN0.5P GROWN ON (511)B GAAS SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID VAPOR-PHASE EPITAXY; LONG-RANGE ORDER; SEMICONDUCTOR ALLOYS; OPTICAL-PROPERTIES; OFF-ANGLE; ENERGY; ALGAINP; GAINP; GAXIN1-XP; MISORIENTATION AB The band gap and microstructure of Ga0.5In0.5P have been shown to vary with deposition conditions. However, growth on (511)B GaAs substrates has been reported to give Ga0.5In0.5P with band gaps close to that of disordered material. It is shown here, that with appropriate selection of the growth parameters, Ga0.5In0.5P can be grown with low band gap and significant ordering on even the (511)B substrates, implying that surface steps play an important role in the ordering process. For the lattice-matched composition, a band gap of 1.83 eV was obtained using low growth temperature (575-degrees-C), low growth rate (0.55 mum/h), and high phosphine pressure (5 Torr). RP KURTZ, SR (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 37 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5110 EP 5113 DI 10.1063/1.355756 PN 1 PG 4 WC Physics, Applied SC Physics GA NN732 UT WOS:A1994NN73200042 ER PT J AU LEMKE, RW CLARK, MC MARDER, BM AF LEMKE, RW CLARK, MC MARDER, BM TI THEORETICAL AND EXPERIMENTAL INVESTIGATION OF A METHOD FOR INCREASING THE OUTPUT POWER OF A MICROWAVE TUBE BASED ON THE SPLIT-CAVITY OSCILLATOR SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID AMPLIFIER AB The split-cavity oscillator (SCO) is a cavity resonator that can be used to produce a high degree of density modulation in an intense relativistic electron beam. The kinetic energy of electrons in the modulated beam can be converted into high-power microwaves. Aspects of the modulated beam that affect the process of converting beam power into microwave power are considered, and a technique is investigated for optimizing the conversion efficiency of a microwave tube based on the SCO. Using a combination of nonlinear theory, numerical simulation, and experiment, it is shown that the most efficient implementation of the SCO is as the modulating component of a klystronlike tube, in which the modulated beam is drifted a relatively short distance to maximize the rf current, which optimizes the efficiency of power extraction. RP LEMKE, RW (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 16 TC 15 Z9 20 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 1994 VL 75 IS 10 BP 5423 EP 5432 DI 10.1063/1.355698 PN 1 PG 10 WC Physics, Applied SC Physics GA NN732 UT WOS:A1994NN73200089 ER PT J AU BENNETT, LH MCMICHAEL, RD TANG, HC WATSON, RE AF BENNETT, LH MCMICHAEL, RD TANG, HC WATSON, RE TI MONTE-CARLO SIMULATIONS OF THE MAGNETOCALORIC EFFECT IN SUPERFERROMAGNETIC CLUSTERS HAVING UNIAXIAL MAGNETIC-ANISOTROPY SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC AB The magnetic entropy change, DELTAS (hence the heating or cooling) of ferromagnetically coupled magnetic clusters induced by an application of a magnetic field is substantial and occurs over a broad temperature range. This behavior contrasts with a ferromagnetic material, where larger entropy changes can be obtained, but only over small temperature ranges close to the Curie point. Monte Carlo simulations have been carried out to obtain DELTAS when the spins are subjected to uniaxial anisotropy fields. While previous calculations for interacting spins showed increases in the Curie temperature and enhancements of DELTAS in the vicinity of the Curie point with increasing anisotropy, the present results for interacting clusters show similar increases in the temperature of DELTAS peaks accompanied by decreases in the peak values of DELTAS. These results show that the flattening of the DELTAS peaks, which make superferromagnetic materials valuable for magnetic refrigeration is assisted by the presence of uniaxial anisotropy. Some effects on DELTAS of placing the spins on fixed BCC, FCC, and sc lattices are reported. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BENNETT, LH (reprint author), NIST,GAITHERSBURG,MD 20899, USA. RI C, Y/G-5456-2010; McMichael, Robert/J-8688-2012; OI McMichael, Robert/0000-0002-1372-664X NR 10 TC 22 Z9 23 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5493 EP 5495 DI 10.1063/1.355667 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400008 ER PT J AU JILES, DC AF JILES, DC TI FREQUENCY-DEPENDENCE OF HYSTERESIS CURVES IN CONDUCTING MAGNETIC-MATERIALS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 0 TC 0 Z9 0 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5511 EP 5511 DI 10.1063/1.355672 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400014 ER PT J AU HANNA, SM AF HANNA, SM TI APPLICATIONS OF FERRITES AND FERROMAGNETS IN TUNING RF CAVITIES FOR ACCELERATORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC AB Traditionally ferrites have been used in accelerators for tuning rf cavities and in nonreciprocal devices controlling the power flow in rf accelerating systems. Recently, the development of cavity tuners based on perpendicularly biased ferrites has shown good progress. Yttrium iron garnet (YIG) is gradually replacing the traditional Ni Zn ferrites. The use of conventional parallel-biased Ni Zn ferrites for varying the frequency of accelerating cavities has the disadvantage of high saturation magnetization (4piM(s)). This precludes practical operation in low magnetic loss regions. Different substitutions have been used with YIG to reduce its 4piM(s), making it a practical candidate for perpendicular biasing operating in the saturation region. In addition, YIG is known for its low dielectric and magnetic losses. In this paper we give a short review of development in accelerator cavity tuners based on perpendicularly biased iron garnet ferrites. We use the operation of a 52 MHz stripline-based YIG tuner which we have tested at BNL as an example to demonstrate the advantages of using YIG in cavity tuners. We also discuss magnetic tuning techniques based on magnetostriction of Ni. RP HANNA, SM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 16 TC 0 Z9 1 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5625 EP 5627 DI 10.1063/1.355662 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400054 ER PT J AU JILES, DC AF JILES, DC TI MODELING THE EFFECTS OF STRESS ON MAGNETIZATION IN FERROMAGNETIC MATERIALS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 2 TC 0 Z9 0 U1 2 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 1994 VL 75 IS 10 BP 5676 EP 5676 DI 10.1063/1.355634 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400078 ER PT J AU KAO, CC CHEN, CT JOHNSON, ED IDZERDA, YU HASTINGS, JB AF KAO, CC CHEN, CT JOHNSON, ED IDZERDA, YU HASTINGS, JB TI SOFT-X-RAY MAGNETOOPTICAL KERR-EFFECT SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. USN,RES LAB,WASHINGTON,DC 20375. RP KAO, CC (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5810 EP 5810 DI 10.1063/1.355575 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400127 ER PT J AU NICOLAIDES, GK PISSAS, M NIARCHOS, D TAYLOR, RD RAO, KV AF NICOLAIDES, GK PISSAS, M NIARCHOS, D TAYLOR, RD RAO, KV TI TEMPERATURE-DEPENDENCE OF THE HYPERFINE FIELD DISTRIBUTIONS IN THE FE93.5-XNDXZR6.5 (X=0, 2) AMORPHOUS-ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID SPIN-GLASS; MAGNETIC-PROPERTIES; TRANSITION AB The 112 K spin-glass Fe93.5Zr6.5 and the reentrant Fe91.5Nd2Zr6.5 amorphous alloys have been studied at various temperatures with Mossbauer spectroscopy technique. At around T = 135 K for the Fe93.5Zr6.5 and at around T = 255 K for the Fe91.5Nd2Zr6.5, six broad lines appear, which are not well resolved. This broadening is ascribed to the magnitude distribution of the magnetic moments of the Fe atoms. From the fitting of the Mossbauer spectra at T = 4.2 K, the mean hyperfine field [H] and the Ecart-type standard deviation sigma(H) were estimated, and are (i) for the Fe93.5Zr6.5 sample, [H] almost-equal-to 205 kOe, and sigma(H) almost-equal-to 77 kOe; (ii) for the Fe91.5Nd2Zr6.5 sample, [H] almost-equal-to 228 kOe and sigma(H) almost-equal-to 70 kOe. These values are found to be relatively consistent with the expected degree of magnetic frustration of the correspondingly Fe moments, according to the Fe content of these alloys. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. ROYAL INST TECHNOL,DEPT CONDENSED MATTER,S-10044 STOCKHOLM 70,SWEDEN. RP NICOLAIDES, GK (reprint author), INST MAT SCI AGHIA PARASKEVI,NATL CTR SCI RES DEMOKRITOS,GR-15310 ATHENS,GREECE. RI Rao, K.V./F-4577-2011; OI NIARCHOS, DIMITRIOS/0000-0002-6256-7497 NR 17 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5853 EP 5855 DI 10.1063/1.355537 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400142 ER PT J AU CHEN, ZJ JILES, DC AF CHEN, ZJ JILES, DC TI MEASUREMENTS OF INTRINSIC MAGNETIC-PROPERTIES OF MATERIALS FROM SURFACE INSPECTION SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,CTR NDE,AMES,IA 50011. RP CHEN, ZJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT & COMP ENGN,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5922 EP 5922 DI 10.1063/1.355513 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400169 ER PT J AU GEHRING, PM HIROTA, K MAJKRZAK, CF SHIRANE, G AF GEHRING, PM HIROTA, K MAJKRZAK, CF SHIRANE, G TI DEPTH-DEPENDENT MAGNETIC CORRELATION LENGTH IN TERBIUM SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP GEHRING, PM (reprint author), NATL INST STAND & TECHNOL,MAT SCI & ENGN LAB,GAITHERSBURG,MD 20899, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5959 EP 5959 DI 10.1063/1.355526 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400183 ER PT J AU MATTSON, JE FULLERTON, EE KUMAR, S LEE, SR SOWERS, CH GRIMSDITCH, M BADER, SD PARKER, FT AF MATTSON, JE FULLERTON, EE KUMAR, S LEE, SR SOWERS, CH GRIMSDITCH, M BADER, SD PARKER, FT TI PHOTOINDUCED ANTIFERROMAGNETIC INTERLAYER COUPLING IN FE SUPERLATTICES WITH IRON SILICIDE SPACERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID X-RAY-DIFFRACTION; BAND-STRUCTURE; EXCHANGE; FILMS; MOSSBAUER; MULTILAYER; REFINEMENT; LAYER; GAP AB Sputtered Fe/FeSi films possessing antiferromagnetic (AF) interlayer coupling at room temperature develop ferromagnetic remanence when cooled below 100 K, but the AF coupling can be restored at low temperature by exposure to visible light of sufficient intensity (> 10 mW/mm2). We attribute these effects to charge carriers in the FeSi spacer layer, which, when thermally or photogenerated, are capable of communicating spin information between the Fe layers. C1 UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES,LA JOLLA,CA 92093. KOREA UNIV,DEPT MET ENGN,SEOUL 136701,SOUTH KOREA. RP MATTSON, JE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 34 TC 18 Z9 18 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6169 EP 6173 DI 10.1063/1.355446 PN 2A PG 5 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400261 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI INFLUENCE OF ELECTRON DAMPING AND RESERVOIR ON THE MAGNETIC PHASE-DIAGRAM OF CHROMIUM-ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The magnetic phase diagram of chromium alloys sensitively depends on both electron damping and the presence of an electron reservoir. If the damping energy GAMMA vanishes and the power rho of the reservoir is infinite, then lightly doped CrMn alloys would experience a first-order transition from an incommensurate (I) to a commensurate (C) spin-density wave (SDW) state with decreasing temperature. Either damping or a finite reservoir may flip the phase boundary from one side of the triple point to the other, allowing a commensurate-to-incommensurate transition with decreasing temperature as observed experimentally. Both damping and a finite reservoir suppress the first-order jumps in the SDW order parameter and wave vector. When rho less-than-or-equal-to 2, the C-I transition is second order for all temperatures. When rho>2, the transition is second order near the tricritical point but first order at lower temperatures. Unlike electron damping, an electron reservoir does not shift the paramagnetic phase boundary and triple point. C1 N DAKOTA STATE UNIV, DEPT PHYS, FARGO, ND 58105 USA. RP OAK RIDGE NATL LAB, DIV SOLID STATE, POB 2008, OAK RIDGE, TN 37831 USA. RI Fishman, Randy/C-8639-2013 NR 13 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6290 EP 6292 DI 10.1063/1.355429 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600025 ER PT J AU NOAKES, DR FAWCETT, E STERNLIEB, BJ SHIRANE, G JANKOWSKA, J AF NOAKES, DR FAWCETT, E STERNLIEB, BJ SHIRANE, G JANKOWSKA, J TI CRITICAL MAGNETIC NEUTRON-SCATTERING ABOVE TN IN CR+0.18 AT PERCENT RE SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 UNIV TORONTO,DEPT PHYS,TORONTO M5S 1A7,ONTARIO,CANADA. BROOKHAVEN NATL LAB,UPTON,NY 11973. SWIERK,INST NUCL RES,PL-05400 OTWOCK,POLAND. RP NOAKES, DR (reprint author), VIRGINIA STATE UNIV,DEPT PHYS,PETERSBURG,VA 23806, USA. NR 3 TC 0 Z9 0 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6321 EP 6321 DI 10.1063/1.355386 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600036 ER PT J AU HAAS, S DAGOTTO, E RIERA, J MERLIN, R NORI, F AF HAAS, S DAGOTTO, E RIERA, J MERLIN, R NORI, F TI RAMAN-SPECTRA OF 2-DIMENSIONAL SPIN-1/2 HEISENBERG ANTIFERROMAGNETS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FLUCTUATIONS; SCATTERING; EXCITATIONS; DEPENDENCE; LA2CUO4 AB The Raman spectrum of two-dimensional spin-1/2 Heisenberg antiferromagnets is calculated by exactly diagonalizing clusters of up to 26 sites. The obtained spectra are compared to experimental results for various high-T(c) precursors, such as La2CuO4 and YBa2Cu3O6.2. In spite of good agreement in the position of the main excitation in the B1g channel, i.e, the two-magnon peak around 0.4 eV, an additional mechanism has to be invoked to account for the broad and asymmetric shape of the overall spectrum. Here, we consider the phonon-magnon interaction which, in a quasistatic approximation, renormalizes the Heisenberg exchange integral. This mechanism is motivated in part by recent experimental observations that the Raman linewidth broadens with increasing temperature. Our results are in good agreement with Raman scattering experiments performed by various groups; in particular, the calculations reproduce the broad line shape of the two-magnon peak, the asymmetry about its maximum, the existence of spectral weight at high energies, and the observation of nominally forbidden A1g scattering. C1 FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,CTR COMPUTATIONALLY INTENS PHYS,OAK RIDGE,TN 37831. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. RP HAAS, S (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. RI Riera, Jose/A-1234-2008; Haas, Stephan/C-4103-2008; Nori, Franco/B-1222-2009; OI Riera, Jose/0000-0003-4546-1137; Nori, Franco/0000-0003-3682-7432; Merlin, Roberto/0000-0002-5584-0248 NR 17 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6340 EP 6342 DI 10.1063/1.355393 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600043 ER PT J AU WANG, XD ANTROPOV, VP HARMON, BN LANG, JC GOLDMAN, AI AF WANG, XD ANTROPOV, VP HARMON, BN LANG, JC GOLDMAN, AI TI CIRCULAR MAGNETIC-X-RAY DICHROISM IN RARE-EARTH MAGNETS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID METAL; ABSORPTION; MOMENTS AB With the availability of dedicated high-intensity synchrotron radiation sources, circular magnetic x-ray dichroism (CMXD) is developing as a technique for the investigation of magnetic properties. CMXD is defined as the difference in absorption between right and left circularly polarized beams at an absorption edge and provides information about the local (element and angular momentum specific) spin and orbital magnetic moments. Both theoretical and experimental work on the CMXD spectra of rare-earth magnets is presented. The nature of the feature below the absorption edge in the rare-earth CMXD spectra for the L2 and L3 edges is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP WANG, XD (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 22 TC 5 Z9 5 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6366 EP 6368 DI 10.1063/1.355351 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600055 ER PT J AU TOBIN, JG WADDILL, GD AF TOBIN, JG WADDILL, GD TI RESONANT PHOTOEMISSION AND MAGNETIC-X-RAY CIRCULAR-DICHROISM IN THE M-SHELL OF ULTRATHIN FILMS OF FE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID CORE-LEVEL PHOTOEMISSION; GRATING MONOCHROMATOR; HIGH-RESOLUTION; POLARIZATION; FE/CU(001); ABSORPTION AB Using magnetic ultrathin films (2-4 monolayers) of Fe on Cu(001) and bulklike Fe, the Fe 3p and Fe 3s core states have been investigated with resonant photoemission and core-level photoemission, including magnetic x-ray circular dichroism (MXCD) experiments. The resonant photoemission experiment has been done, to probe the parentage of various spectral structures. All the observations can be explained as simply due to the presence of Auger features: It is not necessary to invoke configuration interaction combined with strong photoemission resonance. RP TOBIN, JG (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 27 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6369 EP 6371 DI 10.1063/1.355352 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600056 ER PT J AU FULLERTON, EE CONOVER, MJ MATTSON, JE SOWERS, CH BADER, SD AF FULLERTON, EE CONOVER, MJ MATTSON, JE SOWERS, CH BADER, SD TI ORIENTATIONALLY INDEPENDENT ANTIFERROMAGNETIC COUPLING IN EPITAXIAL FE/CR (211) AND (100) SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID MAGNETIC MULTILAYERS; FERROMAGNETIC LAYERS; EXCHANGE; MAGNETORESISTANCE; OSCILLATIONS; DEPENDENCE; CO/CU/CO; MGO(110); GROWTH; CURVES AB We present structural and magnetic characterization of epitaxial Fe/Cr(211) and Fe/Cr(100) superlattices grown simultaneously on MgO(110) and MgO(100) substrates by magnetron sputtering. The epitaxial orientation of the Fe/Cr(211) superlattice with the MgO(110) substrate is Fe/Cr[011]//MgO[001] and the orientation of Fe/Cr(100) is Fe/Cr[001]//MgO[011]. We find that for both orientations, that the interlayer coupling oscillates in sip with a period of 18 angstrom, and, furthermore, that the strength and phase of the magnetic coupling are also nearly identical for these two orientations. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 28 TC 13 Z9 15 U1 2 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 1994 VL 75 IS 10 BP 6461 EP 6463 DI 10.1063/1.356962 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600091 ER PT J AU ROBINSON, RA LYNN, JW LAWSON, AC NAKOTTE, H AF ROBINSON, RA LYNN, JW LAWSON, AC NAKOTTE, H TI TEMPERATURE-DEPENDENCE OF MAGNETIC ORDER IN SINGLE-CRYSTALLINE UPDSN SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC AB The noncollinear hexagonal antiferromagnet UPdSn exhibits two magnetic phase transitions, at 35.5 and 23 K The first transition is from a hexagonal paramagnetic state to a noncollinear antiferromagnetic state with a doubled unit cell (phase 1). The second 23-K transition is to a monoclinic magnetic structure (phase II). Ever since these transitions were discovered, the question has been whether the moments simply rotate at 23 K, or whether the y and z components of the moment order at 35.5 K while the x component orders out of incipient fluctuations at the lower 23-K transition. While previous powder studies were rather inconclusive on this point, in this study new single-crystal neutron-diffraction results are presented that show the second picture to be correct. In addition, the structural distortions that accompany the change in symmetry are discussed and show that there is phase-II type magnetic short-range order between 23 and 35.5 K C1 NIST,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. UNIV AMSTERDAM,VAN DER WAALS ZEEMAN LAB,1018 XE AMSTERDAM,NETHERLANDS. RP ROBINSON, RA (reprint author), LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545, USA. NR 10 TC 11 Z9 11 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 1994 VL 75 IS 10 BP 6589 EP 6591 DI 10.1063/1.356904 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600143 ER PT J AU CABLE, JW WAKABAYASHI, N RADHAKRISHNA, P AF CABLE, JW WAKABAYASHI, N RADHAKRISHNA, P TI STRUCTURE OF THE MODULATED MAGNETIC PHASE OF MN3SN SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 KEIO UNIV,YOKOHAMA,KANAGAWA 223,JAPAN. JAWAHARAL NEHRU CTR ADV SCI RES,BANGALORE 560012,INDIA. RP CABLE, JW (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 3 Z9 3 U1 2 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6601 EP 6601 DI 10.1063/1.356908 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600147 ER PT J AU WANG, XL FERNANDEZBACA, JA WANG, ZR VAKNIN, D JOHNSTON, DC AF WANG, XL FERNANDEZBACA, JA WANG, ZR VAKNIN, D JOHNSTON, DC TI NEUTRON-DIFFRACTION STUDY OF THE MAGNETIC-ORDERING OF BACUO2+X SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP WANG, XL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Wang, Xun-Li/C-9636-2010; Fernandez-Baca, Jaime/C-3984-2014; Vaknin, David/B-3302-2009 OI Wang, Xun-Li/0000-0003-4060-8777; Fernandez-Baca, Jaime/0000-0001-9080-5096; Vaknin, David/0000-0002-0899-9248 NR 0 TC 0 Z9 0 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 1994 VL 75 IS 10 BP 6603 EP 6603 DI 10.1063/1.356911 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600150 ER PT J AU FUERST, CD HERBST, JF SARRAO, JL MIGLIORI, A AF FUERST, CD HERBST, JF SARRAO, JL MIGLIORI, A TI RESONANT ULTRASOUND MEASUREMENTS OF ELASTIC-CONSTANTS IN MELT-SPUN R2FE14B COMPOUNDS (R=CE, PR, ND, ER) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID ND2FE14B; MAGNETS AB Measurements are reported of the longitudinal and transverse elastic moduli of the R2Fe14B compounds having rare-earth component R=Ce, Pr, Nd, and Er. A resonant ultrasound technique was used to determine the elastic constants on hot-pressed, melt-spun samples which are essentially isotropic, polycrystalline specimens of the four compounds. The results for Nd2Fe14B, which agree well with previous studies, and Er2Fe14B exhibit clear signatures of the spin reorientations which occur in those compounds. No such signature appears in the data for Pr2Fe14B, consistent with the fact that no spin reorientation occurs in that material. The ultrasonic attenuation of each sample has also been measured and it has been found that it shows features in the vicinity of spin reorientations (Nd2Fe14B, Er2Fe14B) and the Curie point (Ce2Fe14B). C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP FUERST, CD (reprint author), GM CORP,NAO RES & DEV CTR,DEPT PHYS,30500 MOUND RD,WARREN,MI 48090, USA. NR 13 TC 2 Z9 2 U1 0 U2 6 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 1994 VL 75 IS 10 BP 6625 EP 6627 DI 10.1063/1.356875 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600162 ER PT J AU SCHULTZ, T SMITH, R FONDADO, A MALEY, C BEACOM, T TINKLENBERG, P GROSS, J SAYLOR, C OSEROFF, S FISK, Z CHEONG, SW JONES, TE AF SCHULTZ, T SMITH, R FONDADO, A MALEY, C BEACOM, T TINKLENBERG, P GROSS, J SAYLOR, C OSEROFF, S FISK, Z CHEONG, SW JONES, TE TI RELATIONSHIP BETWEEN WEAK FERROMAGNETISM, SUPERCONDUCTIVITY, AND LATTICE-PARAMETER IN THE A2-X-YBXCEYCUO4 (A, B=LA, PR, ND, SM, EU, GD, Y) COMPOUNDS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID MAGNETIC-PROPERTIES; GD2CUO4 CRYSTALS; R2CUO4 COMPOUNDS; ND2-XCEXCUO4; OXYGEN AB We report the results obtained by x-ray, dc magnetization, ac magnetic susceptibility, microwave magnetic absorption, and electron paramagnetic resonance of the magnetic and superconductive properties of a large series of compounds of the form A2-x-yBxCeyCuO4 with A,B=La, Pr, Nd, Sm, Eu, Gd, and Y For y = 0 antiferromagnetic ordering of the copper moments is present at T(N) almost-equal-to 280 K for all the compounds formed in the tetragonal T' phase. Weak ferromagnetism (WF) associated with the canting of the copper moments is observed in all the compounds with a lattice parameter, aa1, a1 almost-equal-to 3.92 angstrom. The maximum onset temperature T(c) is found for a almost-equal-to 3.95 angstrom. A phase diagram was obtained by varying the lattice parameter size as a function of A, B, and x. The correlation between the appearance of WF in the undoped compounds and the disappearance of superconductivity in the Ce-doped systems is discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. AT&T BELL LABS,MURRAY HILL,NJ 07974. NRAD,SAN DIEGO,CA 92152. RP SCHULTZ, T (reprint author), SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182, USA. NR 16 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6723 EP 6725 DI 10.1063/1.356982 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600192 ER PT J AU XUE, JS WILLIAMS, CW SODERHOLM, L AF XUE, JS WILLIAMS, CW SODERHOLM, L TI THE MAGNETIC AND SUPERCONDUCTING PROPERTIES OF PB2SR2(R/CA)CU3O8, R=PR, CE, AND CM SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP XUE, JS (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6740 EP 6740 DI 10.1063/1.356856 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600199 ER PT J AU CROW, JE SCHNEIDERMUNTAU, HJ PARKIN, DM SULLIVAN, N AF CROW, JE SCHNEIDERMUNTAU, HJ PARKIN, DM SULLIVAN, N TI HIGH MAGNETIC-FIELD RESEARCH - OVERVIEW OF FACILITIES AND SCIENCE AND TECHNOLOGY OPPORTUNITIES SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. RP CROW, JE (reprint author), FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6812 EP 6812 DI 10.1063/1.356841 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600237 ER PT J AU OSEROFF, S CHEONG, SW FONDADO, A AKTAS, B FISK, Z AF OSEROFF, S CHEONG, SW FONDADO, A AKTAS, B FISK, Z TI SPIN-PEIERLS TRANSITION IN CUGEO3 - ELECTRON-PARAMAGNETIC-RESONANCE STUDY SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID CHAINS; INSTABILITY AB Measurements of electron paramagnetic resonance (EPR) at 9 and 35 GHz between 2 and 300 K in single crystals and powder samples of CuGeO3 are presented. Below 14 K a large decrease in the intensity of the Cu2+ EPR signal is observed. The data can be interpreted as due to a spin-Peierls transition. However, an alternative interpretation in terms of a simple structural transition cannot be ruled out. An opening of an energy gap of approximately 25 K is calculated from the analysis. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV SANTIAGO DE COMPOSTELA,SANTIAGO,SPAIN. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP OSEROFF, S (reprint author), SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182, USA. NR 18 TC 37 Z9 37 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 1994 VL 75 IS 10 BP 6819 EP 6821 DI 10.1063/1.356818 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600240 ER PT J AU ELLISON, AJG LOONG, CK WAGNER, J AF ELLISON, AJG LOONG, CK WAGNER, J TI THE STRUCTURE AND SPIN DYNAMICS OF LANTHANIDE-BEARING SILICATE-GLASSES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID COORDINATION ENVIRONMENTS; SYSTEM K2O-SIO2-LA2O3 AB The structure of 3Na2O.R2O3.6SiO2 (R = Nd, Yb and Lu) glasses has been studied by time-of-flight neutron diffraction. The average Si-O and O-O nearest-neighbor coordination is found to be similar to those of the SiO4 tetrahedral units in vitreous SiO2 and other silicate glasses. The rare-earth (RE) ions coordinate with no more than seven nearest-neighbor oxygen atoms. The dynamic and static response of these glasses and their isochemical crystalline analogs has been investigated by inelastic neutron scattering and magnetic susceptibility measurements. The magnetic excitation spectra were analyzed by a ligand-field model using a method of descending symmetry. The correlation between short-range atomic order in a network glass and magnetic interactions of the RE ions with the local environment is discussed. RP ELLISON, AJG (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 16 TC 5 Z9 5 U1 2 U2 6 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 1994 VL 75 IS 10 BP 6825 EP 6827 DI 10.1063/1.356797 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600242 ER PT J AU THANGARAJ, N ECHER, C KRISHNAN, KM FARROW, RFC MARKS, RF PARKIN, SSP AF THANGARAJ, N ECHER, C KRISHNAN, KM FARROW, RFC MARKS, RF PARKIN, SSP TI GIANG MAGNETORESISTANCE AND MICROSTRUCTURAL CHARACTERISTICS OF EPITAXIAL FE-AG AND CO-AG GRANULAR THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID CO/CU MULTILAYERS; CU; SUPERLATTICES; LAYERS AB The microstructure and magnetic properties of phase-separated Fe-Ag and Co-Ag granular alloy films, grown epitaxially on (001) NaCl substrates and exhibiting giant magnetoresistance (GMR), have been investigated. Surprisingly, two Fe-Ag films of similar composition grown under identical conditions are found to have substantially different microstructures yet display similar GMR. The microstructure of the films is characterized by Fe-rich or Co-rich regions, respectively, 350-700 nm in extent, surrounded by a Ag-rich matrix. Within the Ag-rich regions, the Fe concentration varies from 20 to 25 at % and the Co concentration is congruent-to 16 at %. Within these regions essentially pure fcc Co particles and bcc Fe particles are in parallel and rotated epitaxial alignment respectively with the fcc silver matrix. The Co and Fe particles are congruent-to 15-25 angstrom in diameter. It is these small particles which most likely account for the giant magnetoresistance exhibited by these alloys. This suggests that a size distribution of magnetic particles, sharply peaked at the optimum size with limited bulk segregation, might give rise to larger GMR values. C1 IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120. RP THANGARAJ, N (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Parkin, Stuart/D-2521-2012 NR 15 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6900 EP 6902 DI 10.1063/1.356774 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600270 ER PT J AU CHEN, ZJ JILES, DC KAMEDA, J AF CHEN, ZJ JILES, DC KAMEDA, J TI ESTIMATION OF FATIGUE EXPOSURE FROM MAGNETIC COERCIVITY SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC AB An investigation of the effects of fatigue on A533B steel under constant load amplitude is reported in this paper. It was found that the plastic strain of the sample accumulated logarithmically with the number of stress cycles after initial fatigue softening. Based on the fact that plastic strain is often linearly related to the coercivity of material, at least for small changes of H(c), a phenomenological relationship has been developed and tested to correlate the number of stress cycles to this magnetic parameter. This result represents the first successful attempt to relate the fatigue exposure directly to a magnetic parameter. C1 IOWA STATE UNIV SCI & TECHNOL,CTR NDE,AMES,IA 50011. RP CHEN, ZJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 6 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6975 EP 6977 DI 10.1063/1.356746 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600297 ER PT J AU SIPAHI, LB AF SIPAHI, LB TI OVERVIEW OF APPLICATIONS OF MICROMAGNETIC BARKHAUSEN EMISSIONS AS NONINVASIVE MATERIAL CHARACTERIZATION TECHNIQUE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID MAGNETIC-PROPERTIES; DEPENDENCE; STEELS; STRESS; NOISE AB In this concise overview, the physical principles of magnetic Barkhausen effect will be briefly discussed and its recent applications in material characterization will be considered. There are new trends in micromagnetic Barkhausen effect emissions and its applications in the material characterization area. These emissions take place in magnetic materials subjected to changing applied magnetic field, and can be used, for instance, to study noninvasively surface characterization of materials. Since these emissions are quite sensitive to changes in the microstructure and subsurface stress states in magnetic materials, various applications of these of micromagnetic emissions have been found in areas such as nuclear, aerospace, and automotive technologies which use magnetic materials. RP SIPAHI, LB (reprint author), IOWA STATE UNIV SCI & TECHNOL,CTR NONDESTRUCT EVALUAT,INST PHYS RES & TECHNOL,AMES,IA 50011, USA. NR 25 TC 26 Z9 27 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 1994 VL 75 IS 10 BP 6978 EP 6980 DI 10.1063/1.356747 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600298 ER PT J AU SIPAHI, LB GOVINDARAJU, MR JILES, DC AF SIPAHI, LB GOVINDARAJU, MR JILES, DC TI MONITORING NEUTRON EMBRITTLEMENT IN NUCLEAR PRESSURE-VESSEL STEELS USING MICROMAGNETIC BARKHAUSEN EMISSIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC AB In nuclear power plants, neutron embrittlement of pressure vessel steels has been one of the main concerns. The use of micromagnetic Barkhausen emissions is a promising method to monitor the variations in microstructural and subsurface stress states due to their influence on these emissions. Measurements of these emissions can reveal neutron irradiation degradation in nuclear power plant components. Samples which were irradiated at different neutron fluences and annealed at different temperatures were obtained from three reactor surveillance programs. The results of different neutron fluences and annealing procedures showed noticeable fractional changes in the magnetic Barkhausen effect signal parameter, DELTAMBE/MBE, and in the mechanical properties of these specimens. For example, increased intensity of neutron fluence decreased the DELTAMBE/MBE as well as impact energy and upper-shelf energy, but increased Rockwell hardness and yield strength. Typical changes in this parameter were in the range from -20% to -45% for fluences of up to 25 x 10(18) n cm-2. RP SIPAHI, LB (reprint author), IOWA STATE UNIV SCI & TECHNOL,CTR NONDESTRUCT EVALUAT,INST PHYS RES & TECHNOL,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 10 TC 13 Z9 13 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 1994 VL 75 IS 10 BP 6981 EP 6983 DI 10.1063/1.356748 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600299 ER PT J AU LIU, GK LOONG, CK TROUW, F ABRAHAM, MM BOATNER, LA AF LIU, GK LOONG, CK TROUW, F ABRAHAM, MM BOATNER, LA TI SPECTROSCOPIC STUDIES OF MAGNETIC TRANSITIONS IN TBPO4 SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID LINE-SHAPES; EXCITON AB In TbPO4, an antiferromagnetic-phase transition is accompanied by a cooperative Jahn-Teller effect involving a Tb ion-lattice coupling that induces a tetragonal-to-monoclinic distortion of the crystal lattice and an associated readjustment of the Th electronic states as required by the lowering of the rare-earth-site symmetry. The laser-excitation and emission spectra of TbPO4 and 0.1% Tb-doped YPO4 single crystals were studied at temperatures below and above the phase transitions. The line shapes of transitions in the stoichiometric compound are unusually broad and asymmetric while those observed for the dilute compound are relatively sharp. In addition, the TbPO4 spectra show an anomalous temperature dependence near the phase transition, indicating strong interactions of the rare-earth ions with their local environments. In the present work, a comparison of the optical results with the results of new neutron-scattering measurements is made. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP LIU, GK (reprint author), ARGONNE NATL LAB,DIV CHEM & INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 19 TC 6 Z9 6 U1 2 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 7030 EP 7032 DI 10.1063/1.356769 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600317 ER PT J AU CONOVER, MJ FULLERTON, EE MATTSON, JE SOWERS, CH BADER, SD AF CONOVER, MJ FULLERTON, EE MATTSON, JE SOWERS, CH BADER, SD TI GIANT MAGETORESISTANCE IN EPITAXIAL SPUTTERED FE/CR(211) SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP CONOVER, MJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 0 TC 1 Z9 1 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 7080 EP 7080 DI 10.1063/1.356734 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600337 ER PT J AU CORTI, M BORSA, F MILLER, LL RIGAMONTI, A AF CORTI, M BORSA, F MILLER, LL RIGAMONTI, A TI CL-35 NMR-STUDY OF MAGNETIC-ORDERING IN SR2CUO2CL2 SINGLE-CRYSTAL SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID SPIN AB Cl-35 nuclear-magnetic-resonance (NMR) and relaxation measurements have been performed in a Sr2CuO2Cl2 single crystal as a function of orientation between the external magnetic field H-0 and the tetragonal c axis. The onset is found of an anisotropic inhomogeneous broadening of the NMR line without paramagnetic shift starting below about 320 K. The broadening is strongly temperature dependent and it increases with increasing H-0. The relaxation rate T1(-1), on the other hand, diverges at T(N) congruent-to 260 K in agreement with previous results in powder sample. It is suggested that the observed broadening is due to the onset at T>T(N) of a spontaneous nonzero thermal average of the Cu2+ moment lying in the a-b plane. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CORTI, M (reprint author), UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. NR 4 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 7146 EP 7148 DI 10.1063/1.356706 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600363 ER PT J AU PARKS, EK ZHU, L HO, J RILEY, SJ AF PARKS, EK ZHU, L HO, J RILEY, SJ TI THE STRUCTURE OF SMALL NICKEL CLUSTERS .1. NI-3-NI-15 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSITION-METAL CLUSTERS; ELECTRONIC-STRUCTURE; IONIZATION-POTENTIALS; COBALT CLUSTERS; TEMPERATURE-DEPENDENCE; ATOM CLUSTERS; NI CLUSTERS; DEUTERIUM; CHEMISORPTION; SURFACES AB The geometrical structure of small nickel clusters is probed via molecular adsorption of nitrogen on their surfaces. Nitrogen uptake patterns can be rationalized with the proposed structures if it is assumed that N-2 binds to every exposed nickel atom, that the binding energies decrease with increasing metal-metal coordination, and that atoms that are four or less coordinate can bind two nitrogen molecules. In some cases nitrogen adsorption causes a change in cluster structure, usually to one that can accommodate more nitrogen molecules. Cluster structures are proposed for all clusters (bare and nitrogenated) in the 3-15-atom size range except Ni-4 and Ni-11. The nitrogen uptake for Ni-4 is consistent with virtually any structure, and the data for Ni-11 could not be interpreted in terms of a specific structure. In general, nickel cluster structures are different from those found for rare gas clusters as well as those derived from bulk packing. A comparison of the experimental results with existing theoretical calculations is presented. RP PARKS, EK (reprint author), ARGONNE NATL LAB, DIV CHEM, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 75 TC 181 Z9 185 U1 0 U2 13 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1994 VL 100 IS 10 BP 7206 EP 7222 DI 10.1063/1.466868 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NL685 UT WOS:A1994NL68500022 ER PT J AU PETERSON, KA WOON, DE DUNNING, TH AF PETERSON, KA WOON, DE DUNNING, TH TI BENCHMARK CALCULATIONS WITH CORRELATED MOLECULAR WAVE-FUNCTIONS .4. THE CLASSICAL BARRIER HEIGHT OF THE H+H-2-]H-2+H REACTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POTENTIAL-ENERGY SURFACE; CONFIGURATION-INTERACTION CALCULATIONS; QUANTUM MONTE-CARLO; GAUSSIAN-BASIS SETS; H-3; HYDROGEN AB Using systematic sequences of correlation consistent Gaussian basis sets from double to sextuple zeta quality, the classical barrier height of the H+H-2 exchange reaction has been calculated by multireference configuration interaction (MRCI) methods. The MRCI calculations for collinear H-3 have also been calibrated against large basis set full CI (FCI) results, which demonstrate that the MRCI treatment leads to energies less than 1 mu hartree (<0.001 kcal/mol) above the FCI energies. The dependence of both the H-2 and H-3 total energies on the basis set is found to be very regular, and this behavior has been used to extrapolate to the complete basis set (CBS) limits. The resulting estimate of the H-H-H CBS limit yields a classical barrier height, relative to exact H+H-2, of 9.60+/-0.02 kcal/mol; the best directly calculated value for the barrier is equal to 9.62 kcal/mol. These results are in excellent agreement with recent quantum Monte Carlo calculations. RP PETERSON, KA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 36 TC 1127 Z9 1134 U1 2 U2 41 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 1994 VL 100 IS 10 BP 7410 EP 7415 DI 10.1063/1.466884 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NL685 UT WOS:A1994NL68500039 ER PT J AU XANTHEAS, SS AF XANTHEAS, SS TI AB-INITIO STUDIES OF CYCLIC WATER CLUSTERS (H2O)(N), N=1-6 .2. ANALYSIS OF MANY-BODY INTERACTIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LIQUID WATER; MOLECULAR-DYNAMICS; BASIS-SETS; VIBRATIONAL-SPECTRA; POTENTIAL FUNCTIONS; ABINITIO; DIMER; SIMULATION; COMPLEXES; TRIMER AB The magnitudes of the two- through six-body energy terms and their contribution to the interaction energy of small ring water clusters (n=2-6) are computed at the Hartree-Fock (HF) and, second-through fourth-order many-body perturbation (MP2, MP4) levels of theory. The analysis is performed at the minimum energy geometries reported earlier [J. Chem. Phys. 99, 8774 (1993)]. The correlation correction is found to account for a 10%-20% increase in the individual two-body terms and a much larger increase of 75% for the three-body and 200% for the small four-body terms. The MP4 results are found to differ only slightly (<2%) from the corresponding MP2 results. We have found that three-body terms have a significant contribution as high as 30% to the interaction energy of the larger clusters and that four-body and higher order-terms are negligible. The total and incremental association energies for;the processes n H2O-->(H2O)(n) and (H2O)(n-1) + H2O-->(H2O)(n), n=2-6 are also reported. RP PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 51 TC 543 Z9 545 U1 0 U2 23 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD MAY 15 PY 1994 VL 100 IS 10 BP 7523 EP 7534 DI 10.1063/1.466846 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NL685 UT WOS:A1994NL68500053 ER PT J AU HEFFELFINGER, GS VANSWOL, F AF HEFFELFINGER, GS VANSWOL, F TI DIFFUSION IN LENNARD-JONES FLUIDS USING DUAL CONTROL-VOLUME GRAND-CANONICAL MOLECULAR-DYNAMICS SIMULATION (DCV-GCMD) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TEMPERATURE; EQUILIBRIUM; TRANSPORT; LIQUIDS AB A new approach to calculating diffusivities, both transport as well as equilibrium, is presented. The dual control volume grand canonical molecular dynamics (or DCV-GCMD) method employs two local control volumes for chemical potential control via particle creation/destruction as in grand canonical Monte Carlo (GCMC) simulations. The control volumes are inserted in a standard NVT molecular dynamics simulation yielding a simulation with stochastic chemical potential control that may be thought of as a hybrid GCMC-MD approach. The geometrical control of the chemical potential enables a steady state chemical potential gradient to be established in the system. By measuring the density profile and flux, Fick's law is used to determine the diffusivity. An example calculation is presented for a simple Lennard-Jones system. C1 UNIV ILLINOIS,DEPT CHEM ENGN,URBANA,IL 61801. RP HEFFELFINGER, GS (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 17 TC 219 Z9 222 U1 4 U2 40 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 1994 VL 100 IS 10 BP 7548 EP 7552 DI 10.1063/1.466849 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NL685 UT WOS:A1994NL68500056 ER PT J AU JACKSON, B PERSSON, M KAY, BD AF JACKSON, B PERSSON, M KAY, BD TI QUANTUM-MECHANICAL STUDY OF H(G)+CL-AU(111) - ELEY-RIDEAL MECHANISM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; ATOMIC RECOMBINATION DYNAMICS; INTERNAL-STATE DISTRIBUTIONS; MOLECULE PROTON-TRANSFER; FOURIER METHOD SOLUTION; ASSOCIATIVE DESORPTION; VIBRATIONAL-EXCITATION; HYDROGEN DESORPTION; TRIATOMIC-MOLECULES; MONOHYDRIDE PHASE AB Beams of atomic hydrogen are known to react with halogens adsorbed on metal surfaces, and an Eley-Rideal mechanism has been suggested. The collinear reaction of gas phase H with Cl atoms adsorbed on an Au(111) surface is explored-using time dependent quantum techniques. Probabilities for reaction and reflection are computed as a function of incident ii energy and Cl-metal vibrational state. The time evolution is examined and a long lived intermediate is found to exist in which the Cl is bound to both the H and the metal. The probability for Eley-Rideal reaction is found to be small, on the order of a few to several percent, due primarily to the mass mismatch. The vibrational distribution of the product HCl and the temperature dependence of the reaction probability are in agreement with experiment. C1 CHALMERS UNIV TECHNOL, DEPT APPL PHYS, S-41296 GOTHENBURG, SWEDEN. UNIV GOTHENBURG, S-41296 GOTHENBURG, SWEDEN. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP JACKSON, B (reprint author), UNIV MASSACHUSETTS, DEPT CHEM, AMHERST, MA 01003 USA. RI Persson, Mats/A-7514-2011 OI Persson, Mats/0000-0002-1443-9490 NR 52 TC 58 Z9 58 U1 2 U2 9 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 1994 VL 100 IS 10 BP 7687 EP 7695 DI 10.1063/1.466862 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NL685 UT WOS:A1994NL68500070 ER PT J AU YILMA, T AF YILMA, T TI GENETICALLY-ENGINEERED VACCINES FOR ANIMAL VIRAL DISEASES SO JOURNAL OF THE AMERICAN VETERINARY MEDICAL ASSOCIATION LA English DT Article; Proceedings Paper CT Symposium on Biotechnology: The Next Revolution in Veterinary Medicine, at the 130th Annual Meeting of the American-Veterinary-Medical-Association CY JUL 17-23, 1993 CL MINNEAPOLIS, MN SP AMER VET MED ASSOC ID COMPARATIVE SEQUENCE-ANALYSIS; RINDERPEST VIRUS; IMMUNODEFICIENCY-VIRUS; CONFERS PROTECTION; RHESUS MACAQUES; SIV VACCINE; GENE; INFECTION; RECOMBINANTS; EXPRESSION RP YILMA, T (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,INT LAB MOLEC BIOL TROP DIS AGENTS,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GMO8343-01A1]; PHS HHS [O1-A1226471, UO1-A129207] NR 47 TC 9 Z9 9 U1 0 U2 0 PU AMER VETERINARY MEDICAL ASSOC PI SCHAUMBURG PA 1931 N MEACHAM RD SUITE 100, SCHAUMBURG, IL 60173-4360 SN 0003-1488 J9 J AM VET MED ASSOC JI J. Am. Vet. Med. Assoc. PD MAY 15 PY 1994 VL 204 IS 10 BP 1606 EP 1615 PG 10 WC Veterinary Sciences SC Veterinary Sciences GA NK474 UT WOS:A1994NK47400018 PM 8050940 ER PT J AU BURTON, HD AF BURTON, HD TI THE TIMETABLES OF TECHNOLOGY - A CHRONOLOGY OF THE MOST IMPORTANT PEOPLE AND EVENTS IN THE HISTORY OF TECHNOLOGY - BUNCH,B, HELLEMANS,A SO LIBRARY JOURNAL LA English DT Book Review RP BURTON, HD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BOWKER MAGAZINE GROUP CAHNERS MAGAZINE DIVISION PI NEW YORK PA 249 W 17TH ST, NEW YORK, NY 10011 SN 0363-0277 J9 LIBR J JI Libr. J. PD MAY 15 PY 1994 VL 119 IS 9 BP 68 EP 68 PG 1 WC Information Science & Library Science SC Information Science & Library Science GA NL230 UT WOS:A1994NL23000035 ER PT J AU ADAM, A ADRIANI, O AHLEN, S AMBROSI, G BABUCCI, E BAKSAY, L BASCHIROTTO, A BATTISTON, R BAY, A BENCZE, GL BERTUCCI, B BIASINI, M BILEI, GM BOBBINK, GJ BOSETTI, M BROOKS, ML BURGER, WJ BUSENITZ, J CAMPS, C CARIA, M CASTELLINI, G CASTELLO, R CHECCUCCI, B CHEN, A COAN, TE COMMICHAU, V DIBITONTO, D DUINKER, P EASO, S EXTERMANN, P FIANDRINI, E GABBANINI, A GOUGAS, A HANGARTER, K HAUVILLER, C HERVE, A HU, G JOSA, MI KAPUSTINSKY, JS KIM, D KINNISON, WW KORNIS, J KRASTEV, VR LANDI, G LEBEAU, M LEE, DM LEISTE, R LIN, W LOHMANN, W MARIN, A MASSETTI, R MATAY, G MILLS, GB NOWAK, H PASSALEVA, G PAUL, T PAULUZZI, M PENSOTTI, S PERRIN, E RANCOITA, PG RATTAGGI, M ROSCH, A SANTOCCHIA, A SIEDLING, R SACHWITZ, M SCHMITZ, P SCHONEICH, B SERVOLI, L SUSINNO, GF TERZI, G TESI, M TONISCH, F TOTH, J TROWITZSCH, G VIERTEL, G VOGT, H WALDMEIER, S WEGMANN, J WEILL, R XU, J YEH, SC ZHOU, B AF ADAM, A ADRIANI, O AHLEN, S AMBROSI, G BABUCCI, E BAKSAY, L BASCHIROTTO, A BATTISTON, R BAY, A BENCZE, GL BERTUCCI, B BIASINI, M BILEI, GM BOBBINK, GJ BOSETTI, M BROOKS, ML BURGER, WJ BUSENITZ, J CAMPS, C CARIA, M CASTELLINI, G CASTELLO, R CHECCUCCI, B CHEN, A COAN, TE COMMICHAU, V DIBITONTO, D DUINKER, P EASO, S EXTERMANN, P FIANDRINI, E GABBANINI, A GOUGAS, A HANGARTER, K HAUVILLER, C HERVE, A HU, G JOSA, MI KAPUSTINSKY, JS KIM, D KINNISON, WW KORNIS, J KRASTEV, VR LANDI, G LEBEAU, M LEE, DM LEISTE, R LIN, W LOHMANN, W MARIN, A MASSETTI, R MATAY, G MILLS, GB NOWAK, H PASSALEVA, G PAUL, T PAULUZZI, M PENSOTTI, S PERRIN, E RANCOITA, PG RATTAGGI, M ROSCH, A SANTOCCHIA, A SIEDLING, R SACHWITZ, M SCHMITZ, P SCHONEICH, B SERVOLI, L SUSINNO, GF TERZI, G TESI, M TONISCH, F TOTH, J TROWITZSCH, G VIERTEL, G VOGT, H WALDMEIER, S WEGMANN, J WEILL, R XU, J YEH, SC ZHOU, B TI TEST BEAM RESULTS FROM THE PROTOTYPE L3 SILICON MICROVERTEX DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We report test beam results on the overall system performance of two modules of the L3 Silicon Microvertex Detector exposed to a 50 GeV pion beam. Each module consists of two AC coupled double-sided silicon strip detectors equipped with VLSI readout electronics. The associated data acquisition system comprises an 8 bit FADC, an optical data transmission circuit, a specialized data reduction processor and a synchronization module. A spatial resolution of 7.5 mum and 14 mum for the two coordinates and a detection efficiency in excess of 99% are measured. C1 DESY, INST HOCHENERGIEPHYS, D-15738 ZEUTHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY. NIKHEF, 1009 DB AMSTERDAM, NETHERLANDS. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. BOSTON UNIV, BOSTON, MA 02215 USA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. INST RIC ONDE ELETTROMAGNET, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. INFN, SEZ MILANO, I-20133 MILAN, ITALY. INFN, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. NATL CENT UNIV, CHUNGLI, TAIWAN. NATL TSING HUA UNIV, HSINCHU 300, TAIWAN. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. IN2P3, LAPP, CNRS, F-74941 ANNECY LE VIEUX, FRANCE. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. RI Fiandrini, Emanuele/C-4549-2008; Rosch, Achim/A-2962-2009; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Josa, Isabel/K-5184-2014; Rancoita, Pier Giorgio/J-9896-2015; OI Rosch, Achim/0000-0002-6586-5721; Servoli, Leonello/0000-0003-1725-9185; Rancoita, Pier Giorgio/0000-0002-1990-4283; Ambrosi, Giovanni/0000-0001-6977-9559; Castellini, Guido/0000-0002-0177-0643; Bertucci, Bruna/0000-0001-7584-293X NR 19 TC 5 Z9 5 U1 0 U2 3 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 MAY 15 PY 1994 VL 344 IS 3 BP 521 EP 528 DI 10.1016/0168-9002(94)90872-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NL003 UT WOS:A1994NL00300008 ER PT J AU BAGGS, R CHURCH, E COOK, V COWARD, D COXE, R CURTIS, K DAVIS, RS DYKE, J FOLAND, A FREY, R FREYTAG, D GLADDING, G IZEN, JM JOHNSON, RA KING, ME LOCKMAN, W NIEMI, G PUTALLAZ, G SCHINDLER, RH STOKER, DP TOEVS, F VOKURKA, E WEISS, E AF BAGGS, R CHURCH, E COOK, V COWARD, D COXE, R CURTIS, K DAVIS, RS DYKE, J FOLAND, A FREY, R FREYTAG, D GLADDING, G IZEN, JM JOHNSON, RA KING, ME LOCKMAN, W NIEMI, G PUTALLAZ, G SCHINDLER, RH STOKER, DP TOEVS, F VOKURKA, E WEISS, E TI PERFORMANCE OF A LONGITUDINALLY-SEGMENTED CSI(TL) ARRAY SUITABLE FOR A DETECTOR IN A LOW OR MEDIUM-ENERGY E(+)E(-) STORAGE-RING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We present results on energy resolution and linearity, and position resolution, from a test of an array of CsI(Tl) crystals in a pi/e/mu beam (120 to 400 MeV) at TRIUMF. The crystal array was designed to study the effects of longitudinal and transverse crystal segmentation on energy and position resolution and background rejection. We also studied the feasibility of a wavelength-shifter and multi-photodiode readout system, suitable for use in magnetic detectors at low and medium energy, high-luminosity e+e- storage rings. Energy resolutions of (1.69 +/- 0.08)%/square-root E(GeV) and (1.83 +/- 0.05)%/square-root E(GeV) were obtained for two different crystal tower configurations. Position resolution of 6.5 (9.0) mm was obtained at 300 (120) MeV for a 2 x 2 square array of four 4 x 4 x 7.4 cm3 crystals transverse to the beam. C1 UNIV WASHINGTON,SEATTLE,WA 98195. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV TEXAS,DALLAS,TX 75083. UNIV ILLINOIS,URBANA,IL 61801. UNIV OREGON,EUGENE,OR 97403. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV CALIF IRVINE,IRVINE,CA 92717. RP BAGGS, R (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. RI Frey, Raymond/E-2830-2016 OI Frey, Raymond/0000-0003-0341-2636 NR 8 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1994 VL 344 IS 3 BP 547 EP 557 DI 10.1016/0168-9002(94)90875-3 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NL003 UT WOS:A1994NL00300011 ER PT J AU REHM, KE PAUL, M GEHRING, J GLAGOLA, B HENDERSON, D KUTSCHERA, W WUOSMAA, AH AF REHM, KE PAUL, M GEHRING, J GLAGOLA, B HENDERSON, D KUTSCHERA, W WUOSMAA, AH TI MEASUREMENTS OF HEAVY-ION-INDUCED FUSION CROSS-SECTIONS WITH THE GAS-FILLED-MAGNET TECHNIQUE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SUB-BARRIER FUSION; SUBBARRIER FUSION; SEPARATOR; PRODUCTS; SYSTEMS; NUCLEI; JOSEF AB A gas-filled magnet has been used to measure excitation functions of heavy-ion induced fusion reactions. Equipped with a large x - y-position sensitive parallel-grid avalanche detector in the focal plane the setup allows for a very efficient measurement of fusion cross sections at energies above and below the Coulomb barrier. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,JERUSALEM,ISRAEL. RP REHM, KE (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 29 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 15 PY 1994 VL 344 IS 3 BP 614 EP 622 DI 10.1016/0168-9002(94)90883-4 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NL003 UT WOS:A1994NL00300019 ER PT J AU WEINBERGER, P DRCHAL, V SZUNYOGH, L FRITSCHER, J BENNETT, BI AF WEINBERGER, P DRCHAL, V SZUNYOGH, L FRITSCHER, J BENNETT, BI TI ELECTRONIC AND STRUCTURAL-PROPERTIES OF CU-AU ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID EFFECTIVE CLUSTER INTERACTIONS; X-RAY PHOTOEMISSION; CORE-LEVEL SHIFTS; SHORT-RANGE-ORDER; DISORDERED CU3AU; BINARY-ALLOYS; METAL ALLOYS; SURFACE; STATES; 1ST-PRINCIPLES AB The electronic and structural properties of random Cu-Au alloys have been determined using the (all-electron) fully relativistic Korringa-Kohn-Rostoker coherent potential approximation. The concentration was varied in steps of 10% (5% for the A3B and AB3 compositions) and total energy calculations were carried out to determine the corresponding equilibrium lattice constants. Just like the experimental data from which they differ at most by 1.5%, the calculated equilibrium lattice constants show a positive deviation from Vegard's law. The calculated heat of mixing agrees well with the existing experimental data. The equilibrium spectral properties of random Cu-Au alloys are discussed in terms of theoretical photoemission spectra and are compared to experimental data for Cu3Au and pure Au. The structural properties of the compositional series are presented using lattice-constant- and concentration-dependent effective pair (and triplet) interactions up to fourth (tenth) -nearest neighbors and related quantities such as ordering energies and antiphase boundary energies. The ordering processes that govern the CU3Au and CuAu structure are discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP WEINBERGER, P (reprint author), TECH UNIV VIENNA,INST TECH ELEKTROCHEM,GETRIEDEMARKT 9158,A-1060 VIENNA,AUSTRIA. RI Szunyogh, Laszlo/A-7956-2010; Drchal, Vaclav/G-6259-2014 OI Drchal, Vaclav/0000-0002-6628-7417 NR 55 TC 21 Z9 21 U1 1 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 1994 VL 49 IS 19 BP 13366 EP 13372 DI 10.1103/PhysRevB.49.13366 PG 7 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300006 ER PT J AU ZHANG, XG BUTLER, WH MACLAREN, JM VANEK, J AF ZHANG, XG BUTLER, WH MACLAREN, JM VANEK, J TI CELLULAR SOLUTIONS FOR THE POISSON EQUATION IN EXTENDED SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID MULTIPLE-SCATTERING THEORY; SPACE-FILLING POTENTIALS; SOLIDS AB The Poisson equation for the electrostatic potential in a solid is solved using three different cellular techniques. The relative merits of these different approaches are discussed for two test charge densities for which an analytic solution to the Poisson equation is known. The first approach uses full-cell-multiple-scattering theory and results in the familiar structure constant and multipole moment expansion. This solution is shown to be valid everywhere inside the cell, although for points outside the muffin-tin sphere but inside the cell the sums must be performed in the correct order to yield meaningful results. A modification of the multiple-scattering-theory approach yields a second method, a Green-function cellular method, which only requires the solution of a nearest-neighbor linear system of equations. A third approach, a related variational cellular method, is also derived. The variational cellular approach is shown to be the most accurate and reliable, and to have the best convergence in angular momentum of the three methods. Coulomb energies accurate to within 10(-6) hartree are easily achieved with the variational cellular approach, demonstrating the practicality of the approach in electronic structure calculations. C1 TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP ZHANG, XG (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 29 TC 13 Z9 13 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 1994 VL 49 IS 19 BP 13383 EP 13393 DI 10.1103/PhysRevB.49.13383 PG 11 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300009 ER PT J AU CARLISLE, JA MILLER, T CHIANG, TC AF CARLISLE, JA MILLER, T CHIANG, TC TI GE CHEMISORPTION AND ALLOYING ON THE SI(111)-(7X7) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; CORE LEVELS; PHOTOEMISSION; SPECTROSCOPY; INTERFACES; SI(100); STATES AB Photoemission spectroscopy using synchrotron radiation and reflection high-energy electron diffraction have been used to examine sublayer and multilayer deposits of Ge onto Si(111)-(7 X 7) substrates. The decomposed Si 2p and Ge 3d core levels as well as angle-integrated valence-band spectra are analyzed as functions of Ge coverage and annealing temperature. The results reveal details concerning the ordering of the surface atoms and the incorporation of Ge into the surface reconstruction. The modification of the surface atomic structure and local chemical composition is correlated with the observed changes in the surface electronic structure. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. RP CARLISLE, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808 L-370,LIVERMORE,CA 94550, USA. RI Chiang, Tai/H-5528-2011 NR 21 TC 28 Z9 28 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 1994 VL 49 IS 19 BP 13600 EP 13606 DI 10.1103/PhysRevB.49.13600 PG 7 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300033 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI THEORETICAL SURFACE CORE-LEVEL SHIFTS FOR BE(0001) SO PHYSICAL REVIEW B LA English DT Article ID BINDING-ENERGY SHIFTS; ELECTRONIC-STRUCTURE; SEGREGATION AB Core-ionization potentials (CIP's) are computed for Be(0001). Three core features are observed in corresponding photoelectron spectra, with CIP's shifted relative to the bulk core level by -0.825, -0.570, and -0.265 eV. The computed CIP shifts for the outer and subsurface layers, -0.60 and -0.29 eV, respectively, agree with the latter two of these. It is surmised that the -0.825-eV shift is associated with a surface defect. The negative signs of the Be(0001) surface core-level shifts do not fit into the thermochemical picture widely used to explain CIP shifts. The reason is that a core-ionized Be atom is too small to bond effectively to the remainder of the unrelaxed Be lattice. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 22 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1994 VL 49 IS 19 BP 13809 EP 13814 DI 10.1103/PhysRevB.49.13809 PG 6 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300062 ER PT J AU ELSASSER, C FAHNLE, M CHAN, CT HO, KM AF ELSASSER, C FAHNLE, M CHAN, CT HO, KM TI DENSITY-FUNCTIONAL ENERGIES AND FORCES WITH GAUSSIAN-BROADENED FRACTIONAL OCCUPATIONS SO PHYSICAL REVIEW B LA English DT Note ID 1ST-PRINCIPLES PSEUDOPOTENTIAL CALCULATIONS; 4D-TRANSITION METALS; TRANSITION-METALS; HYDROGEN; STATES AB It is demonstrated that the Gaussian-broadening scheme for the explicit inclusion of fractional occupation numbers in density-functional calculations of crystals, as originally given by Fu and Ho [Phys. Rev. B 28, 5480 (1983)], contains an additional term to the total energy which makes the energy functional variational and exactly cancels a correction to the density-functional forces originating from changes in the occupation numbers. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, AMES, IA 50011 USA. RP MAX PLANCK INST MET RES, INST PHYS, HEISENBERGSTR 1, D-70569 STUTTGART, GERMANY. NR 12 TC 96 Z9 96 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1994 VL 49 IS 19 BP 13975 EP 13978 DI 10.1103/PhysRevB.49.13975 PG 4 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300081 ER PT J AU TURGUT, S FALICOV, LM AF TURGUT, S FALICOV, LM TI THEORY OF IMPURITY-INDUCED LATTICE-DISTORTIONS IN THE NORMAL-PHASE OF CHARGE-DENSITY-WAVE SYSTEMS SO PHYSICAL REVIEW B LA English DT Note ID DYNAMICS AB A phenomenological Ginzburg-Landau theory is applied to the normal phase of one-dimensional charge-density-wave systems with a finite concentration of impurities. It is found that the interaction between the impurities and the highly polarizable electron gas leads to a strong and oscillatory impurity-impurity interaction, which in turn leads to ordered impurity arrangements and to sizable periodic lattice distortions. The effect is very strongly dependent on the charge of the impurities, their concentration, and their (interstitial) location in the lattice unit cell. All these factors modify drastically. the periodicity associated with the lattice distortion. The theory explains satisfactorily the changing modulation recently observed by atomic-force microscopy in the normal (room-temperature) phase of NbSe3 with a variety of impurities. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP TURGUT, S (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Turgut, Sadi/A-6589-2010 OI Turgut, Sadi/0000-0003-4575-8424 NR 19 TC 5 Z9 5 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1994 VL 49 IS 19 BP 14043 EP 14046 DI 10.1103/PhysRevB.49.14043 PG 4 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300099 ER PT J AU WU, SC GARRISON, K BEGLEY, AM JONA, F JOHNSON, PD AF WU, SC GARRISON, K BEGLEY, AM JONA, F JOHNSON, PD TI ELECTRONIC-STRUCTURE AND MAGNETISM OF THE RH(001) SURFACE SO PHYSICAL REVIEW B LA English DT Note ID LINEARLY POLARIZED-LIGHT; SPIN-POLARIZATION; EXPERIMENTAL-VERIFICATION; NORMAL EMISSION; FERROMAGNETISM; PHOTOEMISSION; 4D; RH; RADIATION; OVERLAYERS AB Spin-polarized-photoemission experiments on clean Rh{001} show that the surface resonance at the MBAR point (0.60 eV binding energy) in the surface Brillouin zone is weakly ferromagnetic at room temperature. The effect increases with decreasing temperature of the surface and disappears when the surface is covered with 0.5 layer of oxygen. The spin- and angle-resolved photoemission spectra exhibit very small exchange splitting, hence the magnetic moment of the surface atoms cannot be reliably determined, but is estimated to lie between 0.1mu(B) and 0.2mu(B). C1 BEIJING UNIV,DEPT PHYS,BEIJING 100871,PEOPLES R CHINA. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP WU, SC (reprint author), SUNY STONY BROOK,DEPT MAT SCI & ENGN,STONY BROOK,NY 11794, USA. NR 25 TC 38 Z9 39 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 1994 VL 49 IS 19 BP 14081 EP 14084 DI 10.1103/PhysRevB.49.14081 PG 4 WC Physics, Condensed Matter SC Physics GA NN993 UT WOS:A1994NN99300109 ER PT J AU PARKS, C RAMDAS, AK RODRIGUEZ, S ITOH, KM HALLER, EE AF PARKS, C RAMDAS, AK RODRIGUEZ, S ITOH, KM HALLER, EE TI ELECTRONIC BAND-STRUCTURE OF ISOTOPICALLY PURE GERMANIUM - MODULATED TRANSMISSION AND REFLECTIVITY STUDY SO PHYSICAL REVIEW B LA English DT Article ID TEMPERATURE-DEPENDENCE; GE; ISOTOPE; CRYSTALS; DISORDER; SPECTRUM; PHONONS; EXCITON; GE-70; GAPS AB The piezomodulated and photomodulated reflectivity spectra of monoisotopic Ge (Ge-70, Ge-73, Ge-74, Ge-76) and natural Ge measured at T = 6 K show clear signatures of the E0 and the E0 + DELTA0 transitions; their energies increase with increasing isotopic mass. From a comparison of the phonon-assisted indirect transition energies obtained from electromodulated and wavelength-modulated transmission and photoluminescence, the isotopic mass dependence of both the indirect gap and the relevant zone-boundary phonons are deduced. The isotopic-mass dependence of the energy gaps are interpreted in the context of the electron-phonon interaction and the volume expansion of the crystal lattice. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP PARKS, C (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. RI Itoh, Kohei/C-5738-2014 NR 34 TC 61 Z9 61 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 1994 VL 49 IS 20 BP 14244 EP 14250 DI 10.1103/PhysRevB.49.14244 PG 7 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300017 ER PT J AU EMIN, D BUSSAC, MN AF EMIN, D BUSSAC, MN TI DISORDER-INDUCED SMALL-POLARON FORMATION SO PHYSICAL REVIEW B LA English DT Article ID SOLIDS; ELECTRON; CONDUCTIVITY; TRANSITION; EDGE AB Small-polaron formation is studied for a disordered multidimensional version of Holstein's molecular-crystal model (MCM). The MCM is appropriate for the study of polaronic effects in covalent semiconductors, where the electron-lattice interactions are short ranged. Our considerations focus on the ''adiabatic'' regime since it prevails in most semiconductors. In this domain the near-neighbor electronic-transfer energies are much greater than the characteristic phonon energy. We consider a situation in which the characteristic near-neighbor electronic-transfer energy t0 and the small-polaron binding energy E(b) are such that the stable carriers in a crystal would be quasifree rather than small polarons: zt0 > E(b), where z is the number of nearest neighbors. We then address how disordering of the transfer energies affects small-polaron formation. In particular, disorder is taken to replace t0 with a distribution of electronic-transfer energies. Small electronic-transfer energies about some sites by themselves stabilize small-polaron formations at these sites. Moreover, stabilization of a small polaron at a site is found to foster the stabilization of a small polaron at sites adjacent to it. This effect enhances the effectiveness with which disorder can trigger the collapse of a steady-state carrier from being quasifree to being a small polaron. That is, disorder reduces the strength of the electron-lattice coupling needed to stabilize global small-polaron formation. With the stabilization of small-polaronic carriers, the electronic transport changes from being that of quasifree carriers (that may occasionally be trapped at small-polaronic sites) to small-polaron hopping. C1 ECOLE POLYTECH,CTR PHYS THEOR,F-91128 PALAISEAU,FRANCE. RP EMIN, D (reprint author), SANDIA NATL LABS,DEPT ADV MAT PHYS,1153,ALBUQUERQUE,NM 87185, USA. NR 33 TC 31 Z9 31 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1994 VL 49 IS 20 BP 14290 EP 14300 DI 10.1103/PhysRevB.49.14290 PG 11 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300022 ER PT J AU WEI, SH ZUNGER, A AF WEI, SH ZUNGER, A TI OPTICAL-PROPERTIES OF ZINCBLENDE SEMICONDUCTOR ALLOYS - EFFECTS OF EPITAXIAL STRAIN AND ATOMIC ORDERING SO PHYSICAL REVIEW B LA English DT Article ID III-V SEMICONDUCTORS; LONG-RANGE ORDER; BAND-GAP; DEFORMATION POTENTIALS; TETRAHEDRAL SEMICONDUCTORS; QUANTUM-WELLS; VALENCE-BAND; GAAS; SUPERLATTICES; POLARIZATION AB Spontaneous ordering of III-V alloys is known to cause a band-gap reduction \DELTAE(g)\ and a splitting DELTAE12 of the valence-band maximum. Strain also leads to a valence-band splitting and, depending on the sign of the strain epsilon, to an increase (for epsilon < 0) or decrease (for epsilon > 0) in the band gap. We present a general theory explaining how the strain produced by lattice mismatch with the substrate interacts with ordering effects. We find for (001) strain and (111) ''CuPt'' ordering that (i) atomic ordering removes the cusp in the band gap vs strain curve of random alloys; (ii) epitaxial strain always leads to an increase in the ordering-induced valence-band splitting DELTAE12; (iii) atomic ordering reduces the slope of DELTAE12 vs strain; and (iv) while (a) strain; (b) ordering, and (c) clustering can all lead to a band-gap reduction, we show here that the three effects can be partially distinguished on the basis of a DELTAE12 vs \DELTAE(g)\ plot; and (v) the wave-function type at the valence-band maximum (VBM) (and, hence, the cause of the splitting) can be further determined by measuring the polarization dependence of the intensities of the transitions between the VBM split components and the conduction-band minimum; (vi) we predict that ordering can significantly enhance the degree of spin polarization of photoelectrons emitted from the VBM. Ordered III-V alloys can thus be used as a good polarized electron source. These general results open new avenues of band-gap engineering by combining epitaxial strain with atomic ordering. Specific experimentally testable predictions are presented. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 71 TC 145 Z9 145 U1 0 U2 10 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 1994 VL 49 IS 20 BP 14337 EP 14351 DI 10.1103/PhysRevB.49.14337 PG 15 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300028 ER PT J AU PAYNE, AP FUOSS, PH KISKER, DW STEPHENSON, GB BRENNAN, S AF PAYNE, AP FUOSS, PH KISKER, DW STEPHENSON, GB BRENNAN, S TI GAAS C(4X4) SURFACE-STRUCTURE IN ORGANOMETALLIC VAPOR-PHASE EPITAXY SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-SCATTERING; GAAS(001); GROWTH; RECONSTRUCTIONS; STOICHIOMETRY; ANGLE AB While GaAs(001) surface reconstructions have been studied extensively in the ultrahigh-vacuum environment associated with molecular-beam epitaxy (MBE), comparatively little is known of these structures in the chemically rich environment associated with organometallic vapor-phase epitaxy (OMVPE). This work presents a structural study of the c (4 X 4) surface reconstruction stabilized in an arsenic-rich OMVPE environment. Measurements of the in-plane structure were performed in situ using grazing-incidence x-ray scattering with synchrotron radiation. Structural refinement confirms the presence of arsenic-arsenic dimers arranged with the c(4 X 4) symmetry. In concurrence with similar studies performed in the MBE environment, it is found that the surface is a mixture of structural domains composed of two- and three-dimer variants of the c (4 X 4) reconstruction. Atomic positions associated with these structures are presented. The size, aspect ratio, and orientation of the reconstructed regions are shown to be closely related to the atomic step geometry on the crystal surface. C1 IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 93409. RP PAYNE, AP (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Schaff, William/B-5839-2009 NR 22 TC 31 Z9 31 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1994 VL 49 IS 20 BP 14427 EP 14434 DI 10.1103/PhysRevB.49.14427 PG 8 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300038 ER PT J AU MITTLEMAN, DM SCHOENLEIN, RW SHIANG, JJ COLVIN, VL ALIVISATOS, AP SHANK, CV AF MITTLEMAN, DM SCHOENLEIN, RW SHIANG, JJ COLVIN, VL ALIVISATOS, AP SHANK, CV TI QUANTUM-SIZE DEPENDENCE OF FEMTOSECOND ELECTRONIC DEPHASING AND VIBRATIONAL DYNAMICS IN CDSE NANOCRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID FREQUENCY RAMAN-SCATTERING; NONLINEAR OPTICAL-PROPERTIES; SEMICONDUCTOR-DOPED GLASSES; EXCITON ABSORPTION-SPECTRA; SIO2 THIN-FILMS; RESONANCE RAMAN; SILVER PARTICLES; WELL STRUCTURES; HOMOGENEOUS LINEWIDTH; CUCL MICROCRYSTALS AB Femtosecond photon-echo techniques are used to probe the dynamics of quantum-confined excitons in nanocrystals of CdSe. Using three-pulse photon echoes, the modulation of the echo signal from the LO-phonon mode is effectively suppressed, and both the electronic dephasing and the couplings to lattice vibrations are probed directly. Detailed measurements are reported as a function of both nanocrystal size and temperature. The dephasing times vary from 85 fs in nanocrystals of 20-angstrom diameter to 270 fs in 40-angstrom crystals. These rates are determined by several dynamical processes, all of which depend sensitively on the size of the nanocrystal. The time scale of the trapping of the electronic excitation to surface states increases with increasing size. The coupling of the excitation to low-frequency vibrational modes is strongly size dependent as well, in accordance with a theoretical model. The photon echo also gives information on the polar coupling between the electronic state and the LO-phonon mode. This coupling is found to peak at an intermediate size. This phenomenon is interpreted as a manifestation of coupling between the interior confined excitons and localized surface states, which destroys the spherical symmetry of the excited state. Using these data, all of the important contributions to the size-dependent homogeneous linewidths can be enumerated. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Schoenlein, Robert/D-1301-2014; Alivisatos , Paul /N-8863-2015 OI Schoenlein, Robert/0000-0002-6066-7566; Alivisatos , Paul /0000-0001-6895-9048 NR 98 TC 242 Z9 244 U1 3 U2 32 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 1994 VL 49 IS 20 BP 14435 EP 14447 DI 10.1103/PhysRevB.49.14435 PG 13 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300039 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI SULFUR ADSORPTION NEAR A STEP ON AL SO PHYSICAL REVIEW B LA English DT Article ID SURFACE; AL(001); ADATOM; PATH AB Local density-functional calculations show that on Al(331), a S adatom binds preferentially in a step-edge geometry, where it can passivate two relatively undercoordinated surface Al atoms, where it can simultaneously satisfy its own need to complete a closed-shell electronic configuration, and where its nonbonding electrons are minimally repelled by electrons of the substrate. In contrast, on the close-packed Al(111) surface, S optimally resides in a high-coordination site, specifically, a fcc threefold hollow. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 11 Z9 11 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1994 VL 49 IS 20 BP 14632 EP 14637 DI 10.1103/PhysRevB.49.14632 PG 6 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300062 ER PT J AU SHI, X SU, C HESKETT, D BERMAN, L KAO, CC BEDZYK, MJ AF SHI, X SU, C HESKETT, D BERMAN, L KAO, CC BEDZYK, MJ TI ADSORPTION-SITE INVESTIGATION OF RB/CU(111) USING THE X-RAY STANDING-WAVE METHOD SO PHYSICAL REVIEW B LA English DT Article ID SURFACE-STRUCTURE DETERMINATION; ENERGY ELECTRON-DIFFRACTION; METAL ADSORPTION; AL(111); NA AB We have carried out a back reflection x-ray standing-wave investigation to study the adsorbate-substrate bond length and bonding site for the system Rb/Cu(111). Our low-energy electron diffraction study showed an ordered (2 X 2) phase for one monolayer of Rb on Cu(111) (theta = 0.25). By measuring both the (111) and (111BAR) Bragg reflections at this coverage, we determine the Rb adsorption to be in the top site. We observe a high degree of order in the Rb overlayer perpendicular to the surface, with large disorder parallel to the surface. C1 UNIV RHODE ISL,DEPT PHYS,KINGSTON,RI 02881. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Bedzyk, Michael/B-7503-2009; Bedzyk, Michael/K-6903-2013 NR 25 TC 24 Z9 24 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 1994 VL 49 IS 20 BP 14638 EP 14642 DI 10.1103/PhysRevB.49.14638 PG 5 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300063 ER PT J AU KWEI, GH LAWRENCE, JM CANFIELD, PC AF KWEI, GH LAWRENCE, JM CANFIELD, PC TI TEMPERATURE-DEPENDENCE OF THE 4F OCCUPATION OF CE3BI4PT3 SO PHYSICAL REVIEW B LA English DT Note ID EXPANSION; GAP AB We have determined the 4f occupation number n(f) of the Kondo insulator Ce3Bi4Pt3 over the temperature range 10-300 K using x-ray-absorption measurements near the Ce L(III) edge. The compound is weakly mixed valent: n(f) is approximately 0.9 at 10 K and varies slowly with temperature in a manner similar to that observed in metallic mixed-valent rare-earth compounds. C1 UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. RP KWEI, GH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 8 TC 12 Z9 12 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 1994 VL 49 IS 20 BP 14708 EP 14710 DI 10.1103/PhysRevB.49.14708 PG 3 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300071 ER PT J AU BRANDT, MS AGER, JW GOTZ, W JOHNSON, NM HARRIS, JS MOLNAR, RJ MOUSTAKAS, TD AF BRANDT, MS AGER, JW GOTZ, W JOHNSON, NM HARRIS, JS MOLNAR, RJ MOUSTAKAS, TD TI LOCAL VIBRATIONAL-MODES IN MG-DOPED GALLIUM NITRIDE SO PHYSICAL REVIEW B LA English DT Note ID HYDROGEN AB Four local vibrational modes are reported for Mg-doped wurtzite GaN, which as grown possesses high concentrations of hydrogen. The modes, studied by Raman and infrared absorption spectroscopy appear to form two pairs. Based on the observed selection rules, one pair, with room-temperature frequencies of 2168 and 2219 cm-1 is assigned to inequivalent Mg-H complexes in the c plane and parallel to the c axis, respectively. The origin of the second pair of modes at 2151 and 2185 cm-1, which are IR inactive, is speculatively linked to the presence of diatomic molecules such as N2 or H-2. C1 XEROX CORP, PALO ALTO RES CTR, PALO ALTO, CA 94304 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. STANFORD UNIV, SOLID STATE ELECTR LAB, STANFORD, CA 94305 USA. BOSTON UNIV, DEPT ELECT COMP & SYST ENGN, BOSTON, MA 02215 USA. RI Moustakas, Theodore/D-9249-2016; Brandt, Martin/C-5151-2017; OI Moustakas, Theodore/0000-0001-8556-884X; Ager, Joel/0000-0001-9334-9751 NR 15 TC 68 Z9 68 U1 1 U2 13 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 1994 VL 49 IS 20 BP 14758 EP 14761 DI 10.1103/PhysRevB.49.14758 PG 4 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300085 ER PT J AU CHENG, BL SCHRAMM, DN TRURAN, JW AF CHENG, BL SCHRAMM, DN TRURAN, JW TI CONSTRAINTS ON THE STRENGTH OF A PRIMORDIAL MAGNETIC-FIELD FROM BIG-BANG NUCLEOSYNTHESIS SO PHYSICAL REVIEW D LA English DT Article AB The effects of magnetic fields on big bang nucleosynthesis (BBN) are calculated, and the impact on the abundances of the light elements are investigated numerically. An upper limit on the strength of primordial magnetic fields compatible with observations of light element abundances is thus obtained. In the framework of standard BBN theory, the maximum strength of the primordial magnetic fields, on scales greater than 10(4) cm but smaller than the event horizon at the BBN epoch (approximately 1 min, approximately 2 x 10(12) cm), is less-than-or-equal-to 10(11) G. This limit is shown to allow magnetic fields at the time of recombination no stronger than approximately 0.1 G on scales greater-than-or-equal-to 10(11) cm. Our results also strongly indicate that, at the BBN epoch, and for field strengths B less-than-or-equal-to 10(13) G, the effects of magnetic fields on the primordial abundances of light elements are dominated by effects from reaction rates in the presence of primeval magnetic fields rather than by magnetic density effects on the expansion rate. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,DEPT ASTRON,URBANA,IL 61801. UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. NR 31 TC 64 Z9 64 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1994 VL 49 IS 10 BP 5006 EP 5018 DI 10.1103/PhysRevD.49.5006 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN990 UT WOS:A1994NN99000004 ER PT J AU KOLB, EW TKACHEV, II AF KOLB, EW TKACHEV, II TI NONLINEAR AXION DYNAMICS AND THE FORMATION OF COSMOLOGICAL PSEUDOSOLITONS SO PHYSICAL REVIEW D LA English DT Article ID STRONG-CP PROBLEM; INVISIBLE AXION; BOSE STARS; PARTICLES; CONSTRAINTS; INFLATION; CONSERVATION; MINICLUSTERS; INSTANTONS; UNIVERSE AB The (3 + 1)-dimensional evolution of an inhomogeneous axion field configuration around the QCD epoch is studied numerically, including important nonlinear effects due to the attractive self-interaction. It is found that axion perturbations on scales corresponding to causally disconnected regions at T approximately 1 GeV can lead to very dense pseudosoliton configurations we call axitons. These configurations evolve to axion miniclusters with a present density rho(a) greater than or similar to 10(-8) g cm-3. This is high enough for the collisional 2a --> 2a process to lead to Bose-Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW 117312,RUSSIA. RP KOLB, EW (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 51 TC 76 Z9 76 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 1994 VL 49 IS 10 BP 5040 EP 5051 DI 10.1103/PhysRevD.49.5040 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN990 UT WOS:A1994NN99000008 ER PT J AU WANG, Y AF WANG, Y TI MASS AND RADIUS OF COSMIC BALLOONS SO PHYSICAL REVIEW D LA English DT Article ID BALLS AB Cosmic balloons are spherical domain walls with relativistic particles trapped inside. We derive the exact mass and radius relations for a static cosmic balloon using Gauss-Codazzi equations. The cosmic balloon mass as a function of its radius, M(R), is found to have a functional form similar to that of fermion soliton stars, with a fixed point at 2GM(R)IR congruent-to 0.486, which corresponds to the limit of infinite central density. We derive a simple analytical approximation for the mass density of a spherically symmetric relativistic gas star. When applied to the computation of the mass and radius of a cosmic balloon, the analytical approximation yields fairly good agreement with the exact numerical solutions. RP WANG, Y (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Wang, Yun/B-5724-2011 OI Wang, Yun/0000-0002-4749-2984 NR 10 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1994 VL 49 IS 10 BP 5063 EP 5067 DI 10.1103/PhysRevD.49.5063 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN990 UT WOS:A1994NN99000010 ER PT J AU DODELSON, S GYUK, G TURNER, MS AF DODELSON, S GYUK, G TURNER, MS TI PRIMORDIAL NUCLEOSYNTHESIS WITH A DECAYING TAU-NEUTRINO SO PHYSICAL REVIEW D LA English DT Article ID MASSIVE NEUTRINOS; COSMOLOGICAL CONSTRAINTS; EXPERIMENTAL LIMITS; LIGHT-ELEMENTS; EARLY UNIVERSE; BIG-BANG; PARTICLES; LIFETIMES; SN-1987A; SEARCH AB A comprehensive study of the effect of an unstable tau neutrino on primordial nucleosynthesis is presented. The standard code for nucleosynthesis is modified to allow for a massive decaying tau neutrino whose daughter products include neutrinos, photons, e +/- pairs, and/or noninteracting (sterile) daughter products. tau-neutrino decays influence primordial nucleosynthesis in three distinct ways. (i) the energy density of the decaying tau neutrino and its daughter products affect the expansion rate tending to increase He-4, D, and He-3 production; (ii) electromagnetic (EM) decay products heat the EM plasma and dilute the baryon-to-photon ratio tending to decrease He-4 production and increase D and He-3 production; and (iii) electron neutrinos and antineutrinos produced by tau-neutrino decays increase the weak rates that govern the neutrino-to-proton ratio, leading to decreased He-4 production for short lifetimes (less-than-or-similar-to 30 sec) and masses less than about 10 MeV and increased He-4 production for long lifetimes or large masses. The precise effect of a decaying tau neutrino on the yields of primordial nucleosynthesis and the mass-lifetime limits that follow depend crucially upon decay mode. We identify four generic decay modes that serve to bracket the wider range of possibilities: tau neutrino decays to (1) sterile daughter products (e.g., nu(tau) --> nu(mu) + phi; phi is a very weakly interacting scalar particle); (2) sterile daughter product(s)+daughter products(s) that interacts electromagnetically (e.g., nu(tau) --> nu(mu) + gamma); (3) electron neutrino+sterile daughter product(s) (e.g., nu(tau) --> nu(e) + phi); and (4) electron neutrino + daughter product(s) that interact electromagnetically (nu(tau) --> nu(e) + e+/-). Mass-lifetime limits are derived for the four generic decay modes assuming that the abundance of the massive tau neutrino is determined by its electroweak annihilations. In general, nucleosynthesis excludes a tau neutrino of mass 0.4 MeV-30 MeV for lifetimes greater than about 300 sec. These nucleosynthesis bounds are timely since the current laboratory upper bounds to the tau-neutrino mass are around 30 MeV, and together the two bounds very nearly exclude a long-lived tau neutrino more massive than about 0.4 MeV. Further, our nucleosynthesis bounds together with other astrophysical and laboratory bounds exclude a tau neutrino of mass 0.4 MeV -30 MeV of any lifetime that decays with EM daughter product(s). We use our results to constrain the mass times relic abundance of a hypothetical, unstable species with similar decay modes. Finally, we note that tau neutrino of mass 1 MeV to 10 MeV and lifetime 0.1 sec-10 sec whose decay products include an electron neutrino can reduce the He-4 yield to less than that for two massless neutrino species. This fact could be relevant if the primordial mass fraction of He-4 is found to be less than about 0.23 and can also lead to a modification of the nucleosynthesis bound to the number of light (<< 1 MeV) neutrino (and other) particle species. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP DODELSON, S (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 50 TC 55 Z9 55 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1994 VL 49 IS 10 BP 5068 EP 5079 DI 10.1103/PhysRevD.49.5068 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN990 UT WOS:A1994NN99000011 ER PT J AU CURTRIGHT, T ZACHOS, C AF CURTRIGHT, T ZACHOS, C TI CURRENTS, CHARGES, AND CANONICAL STRUCTURE OF PSEUDODUAL CHIRAL MODELS SO PHYSICAL REVIEW D LA English DT Article ID NONLINEAR SIGMA-MODELS; QUANTUM-FIELD THEORY; NONLOCAL CHARGES; CURRENT-ALGEBRA; SYMMETRY AB We discuss the pseudodual chiral model to illustrate a class of two-dimensional theories which have an infinite number of conservation laws but allow particle production, at variance with naive expectations. We describe the symmetries of the pseudodual model, both local and nonlocal, as transmutations of the symmetries of the usual chiral model. We refine the conventional algorithm to more efficiently produce the nonlocal symmetries of the model, and we discuss the complete local current algebra for the pseudodual theory. We also exhibit the canonical transformation which connects the usual chiral model to its fully equivalent dual, further distinguishing the pseudodual theory. C1 ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. RP CURTRIGHT, T (reprint author), UNIV MIAMI, DEPT PHYS, BOX 248046, CORAL GABLES, FL 33124 USA. RI zachos, cosmas/C-4366-2014; Curtright, Thomas/B-6840-2015; OI zachos, cosmas/0000-0003-4379-3875; Curtright, Thomas/0000-0001-7031-5604 NR 26 TC 107 Z9 108 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1994 VL 49 IS 10 BP 5408 EP 5421 DI 10.1103/PhysRevD.49.5408 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN990 UT WOS:A1994NN99000052 ER PT J AU KOVNER, A ROSENSTEIN, B AF KOVNER, A ROSENSTEIN, B TI NEW LOOK AT QED4 - THE PHOTON AS A GOLDSTONE BOSON AND THE TOPOLOGICAL INTERPRETATION OF ELECTRIC CHARGE SO PHYSICAL REVIEW D LA English DT Article ID MASSIVE SCHWINGER MODEL; QUARK CONFINEMENT; PHASE-TRANSITION; MASSLESSNESS; SYMMETRY; FIELDS AB We develop the dual picture for quantum electrodynamics in 3 + 1 dimensions. It is shown that the photon is massless in the Coulomb phase due to spontaneous breaking of the magnetic symmetry group. The generators of this group are the magnetic fluxes through any infinite surface PHI(S). The order parameter for this symmetry breaking is the operator V(C), which creates an infinitely long magnetic vortex. We show that although the order parameter is a stringlike rather than a local operator, the Goldstone theorem is applicable if [V(C)] not-equal 0. If the system is properly regularized in the infrared, we find [V(C)] not-equal 0 in the Coulomb phase and [V(C)] = 0 in the Higgs phase. The Higgs-Coulomb phase transition is therefore understood as a condensation of magnetic vortices. The electric charge in terms of V(C) is topological and is equal to the winding number of the mapping from a circle at spatial infinity into the manifold of possible vacuum expectation values of a magnetic vortex in a given direction. Since the vortex operator takes values in S1 and PI1 (S1) = Z, the electric charge is quantized topologically. C1 ACAD SINICA,INST PHYS,TAIPEI 11529,TAIWAN. RP KOVNER, A (reprint author), LOS ALAMOS NATL LAB,DIV THEORY,T-8,MS B-285,LOS ALAMOS,NM 87545, USA. NR 24 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1994 VL 49 IS 10 BP 5571 EP 5581 DI 10.1103/PhysRevD.49.5571 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN990 UT WOS:A1994NN99000068 ER PT J AU ROUTBORT, JL MILLER, DJ BOLINGRISSER, MA DUNLAP, JA GORETTA, KC AF ROUTBORT, JL MILLER, DJ BOLINGRISSER, MA DUNLAP, JA GORETTA, KC TI DEFORMATION OF YBA2CU4OX SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID TEMPERATURE; CREEP; SUPERCONDUCTOR; STABILITY C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP ROUTBORT, JL (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 20 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 MAY 15 PY 1994 VL 30 IS 10 BP 1241 EP 1244 DI 10.1016/0956-716X(94)90252-6 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NB270 UT WOS:A1994NB27000001 ER PT J AU HORTON, LL MILLER, MK AF HORTON, LL MILLER, MK TI THE INFLUENCE OF RETAINED AUSTENITE ON ALPHA-ALPHA'-PHASE DECOMPOSITION IN FE-CR ALLOYS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ATOM-PROBE; STEELS; NI RP HORTON, LL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 9 TC 4 Z9 4 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD MAY 15 PY 1994 VL 30 IS 10 BP 1305 EP 1310 DI 10.1016/0956-716X(94)90263-1 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NB270 UT WOS:A1994NB27000012 ER PT J AU DEMATTOS, CCP DEMATTOS, CA OSBURN, BI MACLACHLAN, NJ AF DEMATTOS, CCP DEMATTOS, CA OSBURN, BI MACLACHLAN, NJ TI EVOLUTION OF THE L2 GENE OF STRAINS OF BLUETONGUE VIRUS SEROTYPE-10 ISOLATED IN CALIFORNIA SO VIROLOGY LA English DT Note ID EPIZOOTIC HEMORRHAGIC-DISEASE; NUCLEOTIDE-SEQUENCE; UNITED-STATES; ENCEPHALITIS-VIRUS; IDENTIFICATION; HETEROGENEITY; CONSERVATION; ORBIVIRUSES; POLIOVIRUS; VIRULENT AB The genetic characteristics and phylogenetic relationships between the U.S. prototype strain of bluetongue virus serotype 10(BTV 10), the modified live virus vaccine currently used in California, and three field isolates of BTV 10 obtained in 1980 and three in 1990 in California were determined by comparison of their L2 gene sequences. The L2 genes of the 1980 field isolates were very closely related to the L2 genes of the prototype strain and the vaccine strain, differing by only 0.1 to 0.5%. The 1990 field isolates diverged from all the other viruses by an average of 4.8%. They showed a high degree of genetic similarity that ranged from 98.2 to 99.7% and formed a separate group. All BTV 10 viruses derived from a common ancestor (bootstrap value 100%) from which two different lineages have diverged giving rise to two monophyletic groups, one including all the 1990 viruses and the other the prototype, the vaccine, and all 1980 field strains. The bootstrap analyses placed a 100% confidence value at each of these two nodes. These results indicate that two different lineages of BTV 10 circulated in California between 1953 and 1990. The effect of the vaccine on the evolutionary pathways of the BTV 10 population present in California in 1980 was not clearly established, but it did not influence the evolution of the BTV 10 field isolates obtained in 1990, (C) 1994 Academic Press, Inc. RP DEMATTOS, CCP (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT VET PATHOL MICROBIOL & IMMUNOL,DAVIS,CA 95616, USA. NR 45 TC 27 Z9 28 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0042-6822 J9 VIROLOGY JI Virology PD MAY 15 PY 1994 VL 201 IS 1 BP 173 EP 177 DI 10.1006/viro.1994.1281 PG 5 WC Virology SC Virology GA NK296 UT WOS:A1994NK29600023 PM 8178484 ER PT J AU DEBROUCKERE, G FELLER, D BRION, J AF DEBROUCKERE, G FELLER, D BRION, J TI CONFIGURATION-INTERACTION CALCULATIONS ON THE P2 MOLECULE .1. POTENTIAL-ENERGY CURVES OF THE X1-SIGMA-G+ AND A 3-SIGMA-U+ STATES OF P2 - SPECTROSCOPIC PROPERTIES SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article AB Extended basis set, multireference configuration interaction (CI) calculations have been performed on the ground state (X 1SIGMA(g)+) and the lowest experimentally known excited state (a 3SIGMA(u)+) of P2. Computed spectroscopic constants were found to be in good agreement with the available experimental data. An exception to this is the anharmonicity constant omega(e)x(e) of the excited state. The Franck-Condon factors and the pure vibrational transitions for the a 3SIGMA(u)+ --> X 1SIGMA(g)+ transition band, which are unknown experimentally have been derived for several vibrational quantum numbers and compared with corresponding values arising from a simulated spectrum based on the use of the Klein- Dunham potential function. Pure rotational transitions within the ground and excited states, calculated for several vibrational and rotational quantum numbers, agree fairly well with the experimental data. The excited state results were found to be in somewhat closer agreement with experiment than the ground state results. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. UNIV REIMS, FAC SCI,SPECT MOLEC & ATMOSPHER GRP,CNRS,URA D1434, F-51062 REIMS, FRANCE. RP DEBROUCKERE, G (reprint author), UNIV AMSTERDAM, DEPT PHYS & ASTRON, VALCKENIERSTR 65, 1018 XE AMSTERDAM, NETHERLANDS. NR 29 TC 15 Z9 15 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAY 14 PY 1994 VL 27 IS 9 BP 1657 EP 1670 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NN443 UT WOS:A1994NN44300007 ER PT J AU BOESTEN, L DILLON, MA TANAKA, H KIMURA, M SATO, H AF BOESTEN, L DILLON, MA TANAKA, H KIMURA, M SATO, H TI ELASTIC AND VIBRATIONAL-EXCITATION CROSS-SECTIONS FOR ELECTRON COLLISIONS WITH PROPANE SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID LOW-ENERGY; POLYATOMIC-MOLECULES; SELECTION-RULES; SCATTERING; IMPACT; ETHANE; HYDROCARBONS; METHANE; MOTION; DCS AB Absolute, elastic differential cross sections (DCS) for electron-propane collisions have been measured over a range of scattering angles from 10-degrees to 130-degrees and at incident kinetic energies from 2 to 100 eV. The angular distributions were extrapolated to 0-degrees and 180-degrees by a nonlinear phase shift fit and integrated numerically to obtain the integral clastic and momentum transfer cross sections. The observed Dcs agree approximately with a continuum multiple scattering calculation that uses only local potentials and also with a multichannel Schwinger variational calculation. The vibrationally inelastic DCS reveal a shape resonance with a peak at 7.5 eV that is characteristic of trapping by valence orbitals with C-H antibonding character and is identical with peaks encountered in electron-methane and electron-ethane scattering. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. OCHANOMIZU UNIV,DEPT INFORMAT SCI,BUNKYO KU,TOKYO 112,JAPAN. RP BOESTEN, L (reprint author), SOPHIA UNIV,DEPT PHYS,CHIYODA KU,TOKYO 102,JAPAN. NR 49 TC 24 Z9 24 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAY 14 PY 1994 VL 27 IS 9 BP 1845 EP 1855 DI 10.1088/0953-4075/27/9/020 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NN443 UT WOS:A1994NN44300020 ER PT J AU SALIERES, P DITMIRE, T BUDIL, KS PERRY, MD LHUILLIER, A AF SALIERES, P DITMIRE, T BUDIL, KS PERRY, MD LHUILLIER, A TI SPATIAL PROFILES OF HIGH-ORDER HARMONICS GENERATED BY A FEMTOSECOND CRLISAF LASER SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter AB We report the angular distributions of high-order harmonic radiation generated in neon and in argon using a 140 fs Cr:LiSAF laser system. The profiles show an evolution from Gaussian to near flat-top. No substructure is observed except at the highest intensity in a completely ionized gas. The divergence of the harmonics is found to depend essentially on whether they belong to the plateau or to the cutoff. It is approximately constant in the plateau, of the order of 15 mrad and decreases from 15 mrad to 6 mrad in the cutoff region. C1 LAWRENCE LIVERMORE NATL LAB,LASER PROGRAM,LIVERMORE,CA 94550. RP SALIERES, P (reprint author), CTR ETUD SACLAY,CEA,SERV PHOTONS ATOMES & MOLEC,F-91191 GIF SUR YVETTE,FRANCE. RI SALIERES, Pascal/L-7776-2014; L'Huillier, Anne/P-4379-2015 OI SALIERES, Pascal/0000-0001-5899-8246; L'Huillier, Anne/0000-0002-1335-4022 NR 13 TC 47 Z9 47 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAY 14 PY 1994 VL 27 IS 9 BP L217 EP L222 DI 10.1088/0953-4075/27/9/006 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NN443 UT WOS:A1994NN44300006 ER PT J AU PERRY, MD MOUROU, G AF PERRY, MD MOUROU, G TI TERAWATT TO PETAWATT SUBPICOSECOND LASERS SO SCIENCE LA English DT Article ID CHIRPED-PULSE AMPLIFICATION; ABOVE-THRESHOLD IONIZATION; ORDER HARMONIC-GENERATION; TI-SAPPHIRE LASER; ND-GLASS LASER; 1.053 MU-M; REGENERATIVE AMPLIFIER; MULTIPHOTON IONIZATION; PLASMA INTERACTIONS; FEMTOSECOND PULSES AB The application of the chirped-pulse amplification technique to solid-state lasers combined with the availability of broad-bandwidth materials has made possible the development of small-scale terawatt and now even petawatt (1000-terawatt) laser systems. The laser technology used to produce these intense pulses and examples of new phenomena resulting from the application of these systems to atomic and plasma physics are described. C1 UNIV MICHIGAN,CTR ULTRAFAST SCI,ANN ARBOR,MI 48109. RP PERRY, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,LASER PROGRAM,POB 808,L-493,LIVERMORE,CA 94551, USA. NR 89 TC 859 Z9 911 U1 6 U2 74 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 13 PY 1994 VL 264 IS 5161 BP 917 EP 924 DI 10.1126/science.264.5161.917 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NK974 UT WOS:A1994NK97400025 PM 17830079 ER PT J AU SHUL, RJ SCHNEIDER, RP CONSTANTINE, C AF SHUL, RJ SCHNEIDER, RP CONSTANTINE, C TI ANISOTROPIC ELECTRON-CYCLOTRON-RESONANCE ETCHING OF GAINP/ALGALNP HETEROSTRUCTURES SO ELECTRONICS LETTERS LA English DT Article DE ETCHING; SEMICONDUCTORS ID PLASMA; INP; DISCHARGES; CH4/H2/AR AB Anisotropic dry etching of GaInP/AlGaInP heterostructures has been achieved for the first time in a high-ion-density electron cyclotron resonance (ECR)-generated plasma. Structures consisting of AlInP/(GaInP/AlGaInP)/AlInP and AlGaAs/(GaInP/AlGaInP)/AlGaAs heterostructures have been etched in a CH4/H-2/Cl2/BCl3/Ar plasma with smooth sidewalls and surface morphologies. C1 PLASMA THERM INC,ST PETERSBURG,FL 33716. RP SHUL, RJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 37 Z9 37 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 12 PY 1994 VL 30 IS 10 BP 817 EP 819 DI 10.1049/el:19940550 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NQ481 UT WOS:A1994NQ48100049 ER PT J AU MICIC, OI CURTIS, CJ JONES, KM SPRAGUE, JR NOZIK, AJ AF MICIC, OI CURTIS, CJ JONES, KM SPRAGUE, JR NOZIK, AJ TI SYNTHESIS AND CHARACTERIZATION OF INP QUANTUM DOTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID SMALL SEMICONDUCTOR CRYSTALLITES; EXCITED ELECTRONIC STATE; OPTICAL-PROPERTIES; INDIUM-PHOSPHIDE; SIZE DEPENDENCE; CLUSTERS; MICROCRYSTALLITES; CONFINEMENT; PRECURSORS; CDSE AB Colloidal dispersions of quantum dots (QDs) of crystalline InP were synthesized starting from a chloroindium oxalate complex and P(SiMe(3))(3). An InP precursor was formed from the reactants at room temperature; heating the precursor in a solution of trioctylphosphine oxide at 270 degrees C for several days produced InP QDs with a mean diameter of 26.1 +/- 7.5 Angstrom (determined by counting lattice fringes in a TEM micrograph). From the known QD size distribution and its absorption spectrum, we used a theoretical model to calculate the dependence of InP QD bandgap on QD size. From these results we could then calculate the size distribution of any InP colloid from its absorption spectrum. It was found that preparing the InP precursor with an excess of In3+ and then heating it in a mixture of trioctylphosphine oxide and trioctylphosphine at 270 degrees C for 3 days produced a very narrow QD size distribution with a mean diameter of 25 +/- 1.9 Angstrom. RP MICIC, OI (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 37 TC 286 Z9 291 U1 5 U2 109 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 12 PY 1994 VL 98 IS 19 BP 4966 EP 4969 DI 10.1021/j100070a004 PG 4 WC Chemistry, Physical SC Chemistry GA NL776 UT WOS:A1994NL77600004 ER PT J AU SNURR, RQ BELL, AT THEODOROU, DN AF SNURR, RQ BELL, AT THEODOROU, DN TI A HIERARCHICAL ATOMISTIC LATTICE SIMULATION APPROACH FOR THE PREDICTION OF ADSORPTION THERMODYNAMICS OF BENZENE IN SILICALITE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MONTE-CARLO SIMULATION; PARA-XYLENE; MOLECULAR SIMULATIONS; ZEOLITE H-ZSM-5; GAS-ADSORPTION; ZSM-5; SORPTION; METHANE; LOCATION; CRYSTAL AB A lattice model is presented for predicting the adsorption thermodynamics of benzene in silicalite. The parameters for the lattice model are obtained from a detailed atomistic representation of benzene and the silicalite structure. The parameters describe the free energies in the various adsorption sites due to interactions between a benzene molecule and the zeolite, as well as interactions between neighboring benzene adsorbates. The development of the more coarse-grained lattice model from the full atomistic model is presented in detail, noting the approximations involved. The lattice model reproduces the adsorption isotherms calculated previously from atomistic grand canonical Monte Carlo simulations, which were in good agreement with experiment, but the lattice model is over an order of magnitude more efficient computationally. Calculations were performed for the silicalite structure with Pnma symmetry (the so-called ORTHO structure) and with P2(1)2(1)2(1) symmetry (PARA). The model accounts for the step seen in the experimental isotherms; this feature is ascribable to a transformation of the silicalite structure from the ORTHO form to the PARA form at a benzene occupancy of about four molecules per unit cell. C1 UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. RI Snurr, Randall/B-6699-2009; Snurr, Randall/E-4900-2011 NR 29 TC 73 Z9 73 U1 3 U2 12 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 12 PY 1994 VL 98 IS 19 BP 5111 EP 5119 DI 10.1021/j100070a028 PG 9 WC Chemistry, Physical SC Chemistry GA NL776 UT WOS:A1994NL77600028 ER PT J AU SMITH, RD CHENG, X BRUCE, JE HOFSTADLER, SA ANDERSON, GA AF SMITH, RD CHENG, X BRUCE, JE HOFSTADLER, SA ANDERSON, GA TI TRAPPING, DETECTION AND REACTION OF VERY LARGE SINGLE MOLECULAR-IONS BY MASS-SPECTROMETRY SO NATURE LA English DT Article ID ELECTROSPRAY IONIZATION AB RECENT developments have made electrospray-ionization (ESI) mass spectrometry(1-3) an important technique for measuring molecular weights and studying the structures of large molecules of relative molecular masses approaching 200,000 (M(r) 200K). Analysis of still larger molecules is difficult, however: to obtain a mass/charge ratio within the detectable limits, the ions must bear several charges, but a collection of ions of differing multiple charges presents a Spectrum that is hard to interpret. This problem would be avoided if sufficient sensitivity can be achieved to detect individual molecules. Here we describe a technique that realizes this sensitivity for molecules of M(r) to similar to 7 x 10(6), and which has the potential to be extended to M(r) approximate to 10(9). We use ESI and Fourier-transform ion cyclotron resonance mass spectrometry(4) to obtain repeated measurements of the mass-to-charge ratio of single, highly charged molecular ions. We are able to observe stepwise changes in the charge of an isolated ion owing to its reaction with small molecules introduced into the detection cell. This technique should have wide applications for characterization of polymers and large biomolecules. RP SMITH, RD (reprint author), PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 13 TC 99 Z9 100 U1 0 U2 14 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 12 PY 1994 VL 369 IS 6476 BP 137 EP 139 DI 10.1038/369137a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NK971 UT WOS:A1994NK97100045 ER PT J AU PHAM, EK CHANG, SG AF PHAM, EK CHANG, SG TI REMOVAL OF NO FROM FLUE-GASES BY ABSORPTION TO AN IRON(II) THIOCHELATE COMPLEX AND SUBSEQUENT REDUCTION TO AMMONIA SO NATURE LA English DT Article ID DESULFURIZATION; DENITRIFICATION; CYSTEINE AB THE combustion of fossil fuels generates SO2 and NOx pollutants which cause acid rain and urban smog(1). Existing flue-gas desulphurization scrubbers involve wet limestone processes which are efficient for controlling SO2 emissions but are incapable of removing water-insoluble nitric oxide. The current technique for postcombustion control of nitrogen oxide emissions, ammonia-based selective catalytic reduction, suffers from various problems(2,3), including poisoning of the catalysts by fly ash rich in arsenic or alkali, disposal of spent toxic catalysts and the effects of ammonia by-products on plant components downstream from the reactor. To circumvent the need for separate schemes to control SO2 and NOx, we have developed an iron(II) thiochelate complex that enhances the solubility of NO in aqueous solution by rapidly and efficiently absorbing NO to form iron nitrosyl complexes. The bound NO is then converted to ammonia by electrochemical reduction, regenerating the active iron(II) catalyst for continued NO capture. Our results suggest that this process can be readily integrated into existing wet limestone scrubbers for the simultaneous removal of SO2 and NOx. RP PHAM, EK (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 21 TC 74 Z9 88 U1 3 U2 32 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 12 PY 1994 VL 369 IS 6476 BP 139 EP 141 DI 10.1038/369139a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NK971 UT WOS:A1994NK97100046 ER PT J AU EICHTEN, E LANE, K AF EICHTEN, E LANE, K TI MULTISCALE TECHNICOLOR AND TOP PRODUCTION SO PHYSICS LETTERS B LA English DT Article ID DYNAMICAL SYMMETRY BREAKING; HEAVY-QUARK PRODUCTION; CHIRAL HIERARCHIES; SIGNATURES; COLLISIONS; HYPERCOLOR; COLLIDERS; SCALE; MASS AB Pair-production of heavy top quarks at the Tevatron Collider is significantly enhanced by the. color-octet technipion, pi(T), occurring in multiscale models of walking technicolor. We discuss ttBAR rates for m(t) = 170 GeV and M(etaT) = 400-500 GeV. Multiscale models also have color-octet technirho states in the mass range 200-600 GeV that appear as resonances in dijet production and technipion pair-production. C1 BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. RP EICHTEN, E (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 34 TC 80 Z9 80 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 12 PY 1994 VL 327 IS 1-2 BP 129 EP 135 DI 10.1016/0370-2693(94)91540-7 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NN544 UT WOS:A1994NN54400022 ER PT J AU AVENS, LR BOTT, SG CLARK, DL SATTELBERGER, AP WATKIN, JG ZWICK, BD AF AVENS, LR BOTT, SG CLARK, DL SATTELBERGER, AP WATKIN, JG ZWICK, BD TI A CONVENIENT ENTRY INTO TRIVALENT ACTINIDE CHEMISTRY - SYNTHESIS AND CHARACTERIZATION OF ANI3(THF)4 AND AN[N(SIME3)2]3 (AN=U, NP, PU) SO INORGANIC CHEMISTRY LA English DT Article ID LEWIS BASE ADDUCTS; X-RAY STRUCTURE; URANIUM; COMPLEXES; DERIVATIVES; TETRAHYDROFURAN; UCL3(THF)X AB The reaction of excess, oxide-free amalgamated uranium metal turnings with elemental iodine or bromine in coordinating solvents at 0-degrees-C provides dark purple UI3(THF)4 (1), royal blue UBr3(THF)4 (2), purple UI3(dme)2 (3), or jet black UI3(PY)4 (4) in 65-80% isolated yield (THF = tetrahydrofuran, dme - 1,2-dimethoxyethane, py = pyridine). Neptunium and plutonium metal also react cleanly with elemental iodine in aprotic coordinating solvents to give yellow-orange NpI3(THF)4 (5), Off-white PuI3(THF)4 (6), and gray PuI3(PY)4 (7) in 80-90% isolated yields. These organic-solvent-soluble Lewis base adducts of early actinide tribalides are precursors to a variety of inorganic and organometallic actinide complexes. Reaction Of AnI3(THF)4 complexes (U, Np, Pu) 1, 5, and 6 in THF solution with 3 equiv of sodium bis(trimethylsilyl)amide provides the volatile, solvent-free tris-(silylamide) complexes An[N(SiMe3)2]3 [An = U (8), Np (9), Pu (10)] in 80-90% yields. The neptunium and plutonium silylamides are the first examples of homoleptic amido complexes of the transuranic elements. Compounds 1-10 have been fully characterized by variable-temperature proton NMR,IR,UV/vis/near-IR, thermal gravimetric, nd elemental analyses. Single-crystal X-my diffraction data for 1 revealed a pentagonal bipyramidal coordination geometry about the central uranium atom with two axial iodide ligands (U-I = 3.111(2) angstrom (average)) and one equatorial iodide ligand (U-I = 3.167(2) angstrom). All four THF ligands lie in the equatorial plane with an average U-0 distance of 2.52(1) angstrom. Crystal data for 1 (at 23-degrees-C): monoclinic space group P2(1)/c, with a = 8.750(3) angstrom, b = 16.706(16) angstrom, c = 17.697(7) angstrom, beta = 93.64(3)-degrees, V = 2582 angstrom3, d(calc) = 2.33 g CM-3, Z = 4. C1 LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545. RP CLARK, DL (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. RI Clark, David/A-9729-2011; Bott, Simon/C-2226-2017 OI Bott, Simon/0000-0001-7204-4561 NR 54 TC 171 Z9 171 U1 1 U2 27 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 11 PY 1994 VL 33 IS 10 BP 2248 EP 2256 DI 10.1021/ic00088a030 PG 9 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NL689 UT WOS:A1994NL68900030 ER PT J AU SPARKS, LD ANDERSON, KK MEDFORTH, CJ SMITH, KM SHELNUTT, JA AF SPARKS, LD ANDERSON, KK MEDFORTH, CJ SMITH, KM SHELNUTT, JA TI CORRELATIONS BETWEEN RAMAN FREQUENCIES AND STRUCTURE FOR PLANAR AND NONPLANAR METALLOPORPHYRINS SO INORGANIC CHEMISTRY LA English DT Article ID N-15 SUBSTITUTED DERIVATIVES; PORPHYRIN FORCE-FIELD; NICKEL OCTAETHYLPORPHYRIN; VINYL INFLUENCES; SPECTRA; ASSIGNMENTS; HEMOGLOBIN; COMPLEXES; BANDS AB Resonance Raman spectra were obtained for two series of metalloporphyrins, and frequencies of structure-sensitive Raman lines are correlated with structural changes in the porphyrin macrocycle. In the first series, metal derivatives of tetracyclohexenyltetraphenylporphyrin (TC6TPP), the porphinato core size is varied by varying the metal (Ni < Co < Cu), causing little change in the planarity of this nonplanar porphyrin. In the second series, nickel complexes of tetracyclopentenyl-, tetracyclohexenyl-, and tetracycloheptenyltetraphenylporphyrin (NiTC(x)TPP, where x = 5-7), the size of the alkyl ring at the beta-carbon positions of the pyrrole rings is varied. In the NiTC(x)TPP series, the porphyrin macrocycle becomes significantly more nonplanar as the alkyl ring becomes larger and steric crowding increases. As a consequence of the increasing nonplanarity, the porphyrin core contracts. Correlations between Raman frequencies and structural parameters, including core size and C(angle)-N-C(angle). angle (obtained from molecular mechanics calculations), are found for both series of porphyrins. These new correlative relationships are compared to similar relationships previously observed for metal octaalkylporphyrins, metal tetraphenylporphyrins, and a series of Ni octaalkyltetraphenylporphyrins. Most importantly, by comparing the metal series (Ni, Co, Cu, Zn, etc.) for differing porphyrin ligands, we find a trend toward weaker frequency dependence on core size for the more nonplanar porphyrins. Thus, the applicability of this useful structural correlation is extended to both planar and nonplanar porphyrins. Finally, the differences between these correlative relationships are traced to more fundamental (Badger's rule) relationships between vibrational frequencies and the length of bonds contributing to the total potential energy of the vibrational modes corresponding to the structure-sensitive Raman lines. C1 SANDIA NATL LABS,DEPT FUEL SCI,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. 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 37 TC 59 Z9 59 U1 2 U2 5 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 11 PY 1994 VL 33 IS 10 BP 2297 EP 2302 DI 10.1021/ic00088a036 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NL689 UT WOS:A1994NL68900036 ER PT J AU COLIN, P SCHRAMM, DN PEIMBERT, M AF COLIN, P SCHRAMM, DN PEIMBERT, M TI COUNTS OF GALAXIES IN A MERGER MODEL SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, THEORY; GALAXIES, EVOLUTION; GALAXIES, INTERACTIONS; GALAXIES, LUMINOSITY FUNCTION, MASS FUNCTION; GALAXIES, PHOTOMETRY ID HIGH-REDSHIFT GALAXIES; GIANT BRANCH EVOLUTION; MASS-LOSS RATES; H-R DIAGRAMS; POPULATION SYNTHESIS; LUMINOSITY FUNCTIONS; STELLAR POPULATION; FAINT GALAXIES; DISK GALAXIES; NUMBER COUNT AB A model for the photometric evolution of galaxies has been developed and has been applied to the problem of galaxy counts. The integrated colors of galaxies are calculated using the most recently computed evolutionary tracks from Maeder and collaborators complemented with evolutionary tracks derived by other authors. The asymptotic giant branch lifetime is left as a free parameter. A series of cosmological models using different values of the cosmological constant, LAMBDA0, and the density parameter, OMEGA0, have been computed. The universality hypothesis of the luminosity function of galaxies has been abandoned. The influence of galaxy merging on the counts has been considered in a simple manner by assuming that the number of strongly interacting galaxies in a comoving volume increases with redshift as a power law given by (1 + z)3.8. Taking a Schechter parametrization for the luminosity function of the different types of galaxies, we are able to reproduce the observations reasonably well. We have also considered models with a Gaussian distribution for the luminosity function of the brighter galaxies that provide a poorer fit to the observations. It is shown that galaxy count data are not yet able to make unambiguous cosmological statements since evolutionary assumptions are critical. In particular, an OMEGA0 = 1, LAMBDA0 = 0 cosmology is shown to be consistent with the data. C1 UNIV CHICAGO,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,CTR ASTROPHYS,BATAVIA,IL 60510. RP COLIN, P (reprint author), NATL AUTONOMOUS UNIV MEXICO,INST ASTRON,MEXICO CITY 04510,DF,MEXICO. NR 67 TC 10 Z9 10 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 1994 VL 426 IS 2 BP 459 EP 472 DI 10.1086/174082 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NK032 UT WOS:A1994NK03200001 ER PT J AU HARPEL, MR HARTMAN, FC AF HARPEL, MR HARTMAN, FC TI CHEMICAL RESCUE BY EXOGENOUS AMINES OF A SITE-DIRECTED MUTANT OF RIBULOSE 1,5-BISPHOSPHATE CARBOXYLASE/OXYGENASE THAT LACKS A KEY LYSYL RESIDUE SO BIOCHEMISTRY LA English DT Article ID RIBULOSEBISPHOSPHATE CARBOXYLASE; BISPHOSPHATE CARBOXYLASE; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; RHODOSPIRILLUM-RUBRUM; ACTIVE-SITE; SUBSTRATE-SPECIFICITY; TRIOSEPHOSPHATE ISOMERASE; INTERSUBUNIT INTERACTION; REACTION INTERMEDIATE; CO2/O2 SPECIFICITY AB Ligand binding to ribulose 1,5-bisphosphate carboxylase/oxygenase immobilizes the flexible loop 6 of the beta/alpha barrel domain in its closed conformation. Lys329, located at the apex of this loop, interacts electrostatically with Glu48 of the adjacent subunit and with the CO2-derived carboxylate of the carboxylated reaction intermediate [Knight et al. (1990) J. Mol. Biol. 215, 113-160]. Previous studies have implicated Lys329 in the addition of CO2 to the initial enediol(ate) intermediate: mutants at position 329 catalyze enolization of ribulose 1,5-bisphosphate and processing of isolated carboxyketone intermediate, but are severely impaired in overall carboxylation and the tight-binding of the carboxylated intermediate analogue 2-carboxyarabinitol 1,5-bisphosphate. Using the chemical rescue method of Toney and Kirsch [(1989) Science 243, 1485-1488], we show that these defects are partially overcome by exogenous amines. For example, ethylamine enhances the carboxylation rate of K329A by about 80-fold and strengthens complexation of 2-carboxyarabinitol 1,5-bisphosphate. The CO2/O-2 specificity of K329A is increased by amines, but remains lower than the wild-type value. Despite the pronounced enhancement of carboxylase activity, amines do not influence the rate at which ribulose 1,5-bisphosphate is enolized by K329A. Rescue of K329A follows an apparent Bronsted relationship with a beta of 1, implying complete protonation of amine in the rescued transition state. Rate saturation with respect to amine concentration and the different steric preferences for amines between K329A and K329C suggest that the amines bind to the enzyme in the position voided by the mutation. Two side products, one formed via beta-elimination of phosphate from enediol(ate) intermediate and the other linked preferentially to the oxygenase pathway, predominate in the absence of amines. Amines suppress these abortive products in favor of normal turnover products. Collectively, these results not only verify that Lys329 functions primarily in the gaseous substrate addition to the enediol(ate) but also demonstrate the residue's crucial role in stabilizing reaction intermediates. C1 OAK RIDGE NATL LAB,DIV BIOL,PROT ENGN PROGRAM,OAK RIDGE,TN 37831. NR 69 TC 35 Z9 35 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAY 10 PY 1994 VL 33 IS 18 BP 5553 EP 5561 DI 10.1021/bi00184a026 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NK973 UT WOS:A1994NK97300026 PM 8180178 ER PT J AU CHANG, D KEUNG, WY PHILLIPS, I AF CHANG, D KEUNG, WY PHILLIPS, I TI A CLASS OF MODELS WITH LARGE NEUTRINO MAGNETIC-MOMENT SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID RESONANT AMPLIFICATION; SPIN-ROTATION; SMALL MASS; SOLAR; MATTER; FIELD; OSCILLATIONS; SYMMETRY; VACUUM AB We show how a list of symmetry principles can be used to generate a class of models in which the neutrino masses are suppressed while relatively large magnetic moments are allowed. The simplest example is a model for neutrino mass proposed by Zee some time ago. We show how the model can be improved based on the symmetry principle and we also demonstrate other models in this class which avoid some of the weakness in the simplest model. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP CHANG, D (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 42 TC 2 Z9 2 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD MAY 10 PY 1994 VL 9 IS 12 BP 2013 EP 2032 DI 10.1142/S0217751X94000856 PG 20 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA NM505 UT WOS:A1994NM50500003 ER PT J AU FRIEDL, MA MICHAELSEN, J DAVIS, FW WALKER, H SCHIMEL, DS AF FRIEDL, MA MICHAELSEN, J DAVIS, FW WALKER, H SCHIMEL, DS TI ESTIMATING GRASSLAND BIOMASS AND LEAF-AREA INDEX USING GROUND AND SATELLITE DATA SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID REMOTELY SENSED DATA; TALLGRASS PRAIRIE; CANOPY REFLECTANCE; NOAA-AVHRR; VEGETATION; PHOTOSYNTHESIS; TRANSPIRATION; IMAGES; FIFE AB We compared estimates of regional biomass and LAI for a tallgrass prairie site derived from ground data versus estimates derived from satellite data. Linear regression models were estimated to predict LAI and biomass from Landsat-TM data for imagery acquired on three dates spanning the growing season of 1987 using co-registered TM data and ground measurements of LAI and biomass collected at 27 grassland sites. Mapped terrain variables including burning treatment, land-use, and topographic position were included as indicator variables in the models to acccount for variance in biomass and LAI not captured in the TM data. Our results show important differences in the relationships between Kauth-Thomas greenness (from TM), LAI, biomass and the various terrain variables. In general, site-wide estimates of biomass and LAI derived from ground versus satellite-based data were comparable. However, substantial differences were observed in June. In a number of cases, the regression models exhibited significantly higher explained variance due to the incorporation of terrain variables, suggesting that for areas encompassing heterogeneous land-cover the inclusion of categorical terrain data in calibration procedures is a useful technique. C1 UNIV CALIF SANTA BARBARA,CTR REMOTE SENSING & ENVIRONM OPT,SANTA BARBARA,CA 93106. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. RP FRIEDL, MA (reprint author), BOSTON UNIV,CTR REMOTE SENSING,675 COMMONWEALTH AVE,BOSTON,MA 02215, USA. RI Davis, Frank/B-7010-2009 OI Davis, Frank/0000-0002-4643-5718 NR 46 TC 82 Z9 91 U1 2 U2 19 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD MAY 10 PY 1994 VL 15 IS 7 BP 1401 EP 1420 PG 20 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA NQ127 UT WOS:A1994NQ12700004 ER PT J AU DURHAM, WB BONNER, BP AF DURHAM, WB BONNER, BP TI SELF-PROPPING AND FLUID-FLOW IN SLIGHTLY OFFSET JOINTS AT HIGH EFFECTIVE PRESSURES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID ROCK JOINTS; HYDROTHERMAL SYSTEMS; PERMEABILITY; DEFORMATION; TRANSPORT; CONDUCTIVITY; EVOLUTION; FRACTURES; SURFACES; GRANITE AB We have made laboratory measurements of joint closure and permeability of both well- and poorly mated, laboratory-produced joints in Westerly granite under joint normal stresses to 160 MPa, appropriate to midcrustal depths. We have also made detailed topographic measurements of the joint surfaces, both before and after pressure testing. The purpose of the study was to characterize and understand the hydraulic behavior of joints under conditions where fluid migration under natural settings is known to occur but where physical conditions, namely high lithostatic load, suggest that the presence of open, fluid-conducting joints might be improbable. Normal stress was applied by hydrostatic confinement of cylindrical samples, each containing a single axial tensile fracture. Experiments were performed at room temperature under conditions designed to minimize chemical effects of dissolution or precipitation. We found that while a mated joint can be completely closed by the application of high normal stresses, the same joint laterally offset by 0.53 mm remains open and many orders of magnitude more hydraulically conductive than the mated joint even at highest stresses. Detailed topographic observations are consistent with self-propping of the offset joint. Permanent damage to the surfaces of the offset joint is not widespread but occurs at isolated locales covering about 10% of the surface. Damage is confined to regions of negative (convex upward) curvature, such as summits and the edges of plateaus. Approximately 20% of the joint surface is in wall-to-wall contact at 160 MPa, and the flow tortuosity thus induced is probably the cause of the breakdown of the parallel plate approximation for fluid flow in the offset joint. RP DURHAM, WB (reprint author), LAWRENCE LIVERMORE NATL LAB, L-201, BOX 808, LIVERMORE, CA 94550 USA. NR 38 TC 67 Z9 73 U1 2 U2 10 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD MAY 10 PY 1994 VL 99 IS B5 BP 9391 EP 9399 DI 10.1029/94JB00242 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NL920 UT WOS:A1994NL92000025 ER PT J AU JUDSON, RS JAEGER, EP TREASURYWALA, AM AF JUDSON, RS JAEGER, EP TREASURYWALA, AM TI A GENETIC ALGORITHM-BASED METHOD FOR DOCKING FLEXIBLE MOLECULES SO JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM LA English DT Article ID CONFORMATIONAL-ANALYSIS; ENERGY MINIMIZATION; BROWNIAN DYNAMICS; AUTOMATED DOCKING; SIMULATIONS; INHIBITORS; RECEPTOR; DISCOVERY; PROTEINS; SEARCH AB We describe a computational method for docking flexible molecules into protein binding sites. The method uses a genetic algorithm (GA) to search the combined conformation/orientation space of the molecule to find low energy conformations. Several techniques are described that increase the efficiency of the basic search method. These include the use of several interacting GA subpopulations or niches; the use of a ''growing'' algorithm that initially dooks only a small part of the molecule, and the use of gradient minimization during the search. To illustrate the method, we dock Cbz-GlyP-Leu-Leu (ZGLL) into thermolysin. This system was chosen because a well refined crystal structure is available and because another docking method had previously been tested on this system. Our method is able to find conformations that lie physically close to and in some cases lower in energy than the crystal conformation in reasonable periods of time on readily available hardware. C1 STERLING WINTHROP INC, COLLEGEVILLE, PA 19426 USA. RP JUDSON, RS (reprint author), SANDIA NATL LABS, CTR COMPUTAT ENGN 8117, LIVERMORE, CA 94551 USA. OI Judson, Richard/0000-0002-2348-9633 NR 46 TC 4 Z9 4 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 J MOL STRUC-THEOCHEM JI Theochem-J. Mol. Struct. PD MAY 10 PY 1994 VL 114 BP 191 EP 206 PG 16 WC Chemistry, Physical SC Chemistry GA NN803 UT WOS:A1994NN80300014 ER PT J AU GROTHUES, D CANTOR, CR SMITH, CL AF GROTHUES, D CANTOR, CR SMITH, CL TI TOP-DOWN CONSTRUCTION OF AN ORDERED SCHIZOSACCHAROMYCES-POMBE COSMID LIBRARY SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID LARGE DNA-MOLECULES; GEL-ELECTROPHORESIS; GENOME; FIELD; OLIGONUCLEOTIDES; HYBRIDIZATION; SEPARATION AB A very rapid and efficient method for sorting and ordering large numbers of clones is presented. This top-down mapping approach divides the entire ordering problem into many smaller tasks and analyzes in parallel a gridded membrane array of clones by hybridization with probe pools. The strategy was tested on a 15-fold-coverage Schizosaccharomyces pombe cosmid library. About 1600 clones were assigned to chromosomes and to regions defined by the Not I and Sfi I restriction maps. Then, the clones were ordered into 20 contigs, which is consistent with statistical expectations for the degree of genome coverage used. The parallel ordering of clones and the computer-based analysis of digitized images make this approach very efficient; it is about 8-fold faster than existing methods. Only 61 hybridizations were needed to order 1600 clones. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 NR 22 TC 3 Z9 3 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 MAY 10 PY 1994 VL 91 IS 10 BP 4461 EP 4465 DI 10.1073/pnas.91.10.4461 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NL608 UT WOS:A1994NL60800074 PM 8183932 ER PT J AU BAKER, JP BLANCH, HW PRAUSNITZ, JM AF BAKER, JP BLANCH, HW PRAUSNITZ, JM TI EQUILIBRIUM SWELLING PROPERTIES OF WEAKLY IONIZABLE 2-HYDROXYETHYL METHACRYLATE (HEMA)-BASED HYDROGELS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID GELS; PH AB Hydrogels, sensitive to pH, were prepared by copolymerizing 2-hydroxyethyl methacrylate (HEMA) with 2-dimethylaminoethyl methacrylate (DMA). The mole fraction of the DMA monomer present during synthesis was fixed at 0.3, while the volume fraction of total monomer varied from 0.29 (I) to 1.0 (II). Swelling equilibria were measured in citrate or phosphate buffer for pH from 3.0 to 7.6. Swelling of the hydrogels depends on the volume fraction monomer present during synthesis, solution pH, and identity of the buffer. Hydrogel I reached a four-fold larger swelling ratio (g swollen hydrogel/g dry hydrogel) in pH 3.0 citrate buffer, as compared to hydrogel II. Experimental results are interpreted on the basis of ideal Donnan equilibria. (C) 1994 John Wiley & Sons, Inc. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 16 TC 26 Z9 26 U1 0 U2 1 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 9 PY 1994 VL 52 IS 6 BP 783 EP 788 DI 10.1002/app.1994.070520609 PG 6 WC Polymer Science SC Polymer Science GA NG724 UT WOS:A1994NG72400009 ER PT J AU LONDONO, JD NARTEN, AH WIGNALL, GD HONNELL, KG HSIEH, ET JOHNSON, TW BATES, FS AF LONDONO, JD NARTEN, AH WIGNALL, GD HONNELL, KG HSIEH, ET JOHNSON, TW BATES, FS TI COMPOSITION DEPENDENCE OF THE INTERACTION PARAMETER IN ISOTOPIC POLYMER BLENDS SO MACROMOLECULES LA English DT Article ID ANGLE NEUTRON-SCATTERING; LATTICE CLUSTER THEORY; MONOMER STRUCTURE; CONCENTRATION FLUCTUATIONS; INTERACTION ENERGIES; MOLECULAR-WEIGHT; PHASE-SEPARATION; LIQUID-MIXTURES; BINARY BLENDS; COMPRESSIBILITY AB Isotopic polymer mixtures lack the structural asymmetries and specific interactions encountered in blends of chemically distinct species. In this respect, they form ideal model systems for exploring the limitations of the widely-used Flory-Huggins (FH) lattice model and for testing and improving new theories of polymer thermodynamics. The FH interaction parameter between deuterium-labeled and unlabeled segments of the same species (chi(HD)) should in principle be independent of concentration (phi), though previous small-angle neutron scattering (SANS) experiments have shown that it exhibits a minimum at phi approximately 0.5 for poly(vinylethylene) (PVE) and poly(ethylethylene) (PEE). We report new data on polyethylene (PE) as a function of molecular weight, temperature (T), and phi, which show qualitatively similar behavior. However, measurements on chi(HD)(phi) for polystyrene (PS) show a maximum at phi approximately 0.5, in contrast to PVE, PEE, and PE. Reproducing the concentration dependence of phi in different model isotopic systems should serve as a sensitive test of the way in which theories of polymer thermodynamics can account for the details of the local packing and also the effects of noncombinatorial entropy, which appear to be the main cause of the variation of chi(HD)(phi) for PE. These data also serve to quantify the effects of isotopic substitution in SANS experiments on polyolefin blends and thus lay the groundwork for definitive studies of the compatibility of branched and linear polyethylenes. C1 PHILLIPS PETR CO,RES & DEV,BARTLESVILLE,OK 74004. UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455. RP LONDONO, JD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 68 TC 89 Z9 89 U1 3 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 9 PY 1994 VL 27 IS 10 BP 2864 EP 2871 DI 10.1021/ma00088a029 PG 8 WC Polymer Science SC Polymer Science GA NL250 UT WOS:A1994NL25000029 ER PT J AU LAENEN, E LEVIN, E SHUVAEV, AG AF LAENEN, E LEVIN, E SHUVAEV, AG TI ANOMALOUS DIMENSIONS OF HIGH-TWIST OPERATORS IN QCD AT N[-1 AND LARGE Q(2) SO NUCLEAR PHYSICS B LA English DT Article ID SCATTERING AB The anomalous dimensions of high-twist operators in deeply inelastic scattering (gamma2n) are calculated in the limit when the moment variable N --> 1 (or x(B) --> 0) and at large Q2 (the double logarithmic approximation) in perturbative QCD. We find that the value of gamma2n X (N - 1) in this approximation behaves as [N(c)alpha(s)/pi(N - 1)]n2 [1 + 1/3delta(n2 - 1)] where delta almost-equal-to 10(-2). This implies that the contributions of the high-twist operators give rise to an earlier onset of shadowing than was estimated before. The derivation makes use of a Pomeron exchange approximation, with the Pomerons interacting attractively. We find that they behave as a system of fermions. C1 ST PETERSBURG NUCL PHYS INST,ST PETERSBURG,RUSSIA. RP LAENEN, E (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,MS 106,BATAVIA,IL 60510, USA. NR 14 TC 10 Z9 10 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 9 PY 1994 VL 419 IS 1 BP 39 EP 58 DI 10.1016/0550-3213(94)90356-5 PG 20 WC Physics, Particles & Fields SC Physics GA NT129 UT WOS:A1994NT12900003 ER PT J AU CONTOPANAGOS, H STERMAN, G AF CONTOPANAGOS, H STERMAN, G TI PRINCIPAL VALUE RESUMMATION SO NUCLEAR PHYSICS B LA English DT Article ID YAN CROSS-SECTION; ORDER PERTURBATION-THEORY; INFRARED RENORMALONS; QCD; SOFT; NORMALIZATION; SUMMATION AB We present a new resummation formula for the Drell-Yan cross section. The formal resummation of threshold corrections in Drell-Yan hard-scattering functions produces an exponent with singularities from the infrared pole of the QCD running coupling. Our reformulation treats such ''infrared renormalons'' by a principal value prescription, analogous to a modified Borel transform. The resulting expression includes all large threshold corrections to the hard-scattering function as an asymptotic series in alpha(s), but is a finite function of Q2. We find that the ambiguities of the resummed perturbation theory imply the presence of higher twist corrections to quark-antiquark hard-scattering functions that begin at LAMBDA(QCD)/Q. This suggests an important role for higher twist in the phenomenology of hadron-hadron inclusive cross sections. We also discuss the numerical evaluation of the exponent and its asymptotic perturbation series for representative values of Q2. C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP CONTOPANAGOS, H (reprint author), SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794, USA. NR 29 TC 90 Z9 90 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 9 PY 1994 VL 419 IS 1 BP 77 EP 101 DI 10.1016/0550-3213(94)90358-1 PG 25 WC Physics, Particles & Fields SC Physics GA NT129 UT WOS:A1994NT12900005 ER PT J AU GU, P HAAS, P HOGAN, WP KIM, SK MATTHES, JN MYUNG, SS SCHNETZER, S THOMSON, GB ZOU, Y ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BRIERE, RA CHEU, E HARRIS, DA MCFARLAND, KS ROODMAN, A SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T AF GU, P HAAS, P HOGAN, WP KIM, SK MATTHES, JN MYUNG, SS SCHNETZER, S THOMSON, GB ZOU, Y ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BRIERE, RA CHEU, E HARRIS, DA MCFARLAND, KS ROODMAN, A SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T TI MEASUREMENT OF THE BRANCHING RATIO AND A STUDY OF CP FOR THE LEPTONIC DECAY KAPPA(L)-]E+E-E+E- SO PHYSICAL REVIEW LETTERS LA English DT Article AB We have determined the branching ratio of K(L) --> e+e-e+e-; based on the observation of 27 four-electron final state events with 0.36 estimated background event, B(K(L) --> e+e-e+e-) = [3.96 +/- 0.78(stat) +/- 0.32(syst)] x 10(-8). Using the distribution of the angle between the e+e- pair decay planes, we find that the decay proceeds predominantly through the K2 (CP = -1) state. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. UNIV COLORADO,BOULDER,CO 80309. ELMHURST COLL,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,URBANA,IL 61801. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. RP GU, P (reprint author), RUTGERS STATE UNIV,PISCATAWAY,NJ 08855, USA. RI Briere, Roy/N-7819-2014; Kim, Sun Kee/G-2042-2015 OI Briere, Roy/0000-0001-5229-1039; Kim, Sun Kee/0000-0002-0013-0775 NR 14 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 9 PY 1994 VL 72 IS 19 BP 3000 EP 3003 DI 10.1103/PhysRevLett.72.3000 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700007 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ARETI, H AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J HENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUSTON, J HUTH, J HYLEN, J INCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MITSUSHIO, H MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OHL, KE OISHI, R OKUSAWA, T PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A STRAIT, J SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLESTRUP, A TONNISON, J TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F UNAL, G VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, GC ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ARETI, H AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M COOPER, J CORDELLI, M COUPAL, DP CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DONE, JP DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S ETCHEGOYEN, A FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J HENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUSTON, J HUTH, J HYLEN, J INCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LONG, O LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MITSUSHIO, H MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OHL, KE OISHI, R OKUSAWA, T PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A STRAIT, J SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLESTRUP, A TONNISON, J TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F UNAL, G VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, J WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILKINSON, R WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, GC ZUCCHELLI, S TI SEARCH FOR EXCITED QUARKS IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRON COLLIDERS; DETECTOR AB If quarks are composite particles then excited states are expected. We have searched in ppBAR collisions for excited quarks (q*) which decay to common quarks by emitting a W boson (q* --> qW) or a photon (q* --> qgamma). The simplest model of excited quarks has been excluded for mass M* < 540 GeV/c2 at 95% confidence level. C1 UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. DUKE UNIV,DURHAM,NC 27708. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. UNIV ILLINOIS,URBANA,IL 61801. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. UNIV ROCHESTER,ROCHESTER,NY 14627. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. UNIV WISCONSIN,MADISON,WI 53706. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. HARVARD UNIV,CAMBRIDGE,MA 02138. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. OSAKA CITY UNIV,OSAKA 558,JAPAN. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. TUFTS UNIV,MEDFORD,MA 02155. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; NR 12 TC 34 Z9 34 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 9 PY 1994 VL 72 IS 19 BP 3004 EP 3008 DI 10.1103/PhysRevLett.72.3004 PG 5 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700008 ER PT J AU HEISELBERG, H AF HEISELBERG, H TI COLOR, SPIN, AND FLAVOR DIFFUSION IN QUARK-GLUON PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TEMPERATURE QCD; TRANSVERSE INTERACTIONS; ENERGETIC GLUONS; TRANSPORT AB In weakly interacting quark-gluon plasmas diffusion of color is found to be much slower than the diffusion of spin and flavor because color is easily exchanged by the gluons in the very singular forward scattering processes. If the infrared divergence is cut off by a magnetic mass, m(mag) is similar to alpha(s)T, the color diffusion is D(color) is similar to [alpha(s) ln(1/alpha(s))T]-1, a factor alpha(s) smaller than spin and flavor diffusion. A similar effect is expected in electroweak plasmas above M(W) due to W+/- exchanges. The color conductivity in quark-gluon plasmas and the electrical conductivity in electroweak plasmas are correspondingly small in relativistic heavy ion collisions and the very early Universe. RP LAWRENCE BERKELEY LAB, DIV NUCL SCI, MS 70A-3307, BERKELEY, CA 94720 USA. OI Heiselberg, Henning/0000-0003-2229-2000 NR 18 TC 35 Z9 35 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 9 PY 1994 VL 72 IS 19 BP 3013 EP 3016 DI 10.1103/PhysRevLett.72.3013 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700010 ER PT J AU KEANE, CJ HAMMEL, BA OSTERHELD, AL KANIA, DR AF KEANE, CJ HAMMEL, BA OSTERHELD, AL KANIA, DR TI DENSITY AND TEMPERATURE-SENSITIVE FEATURES IN HIGH-TEMPERATURE PLASMA L-SHELL XENON EMISSION-SPECTRA SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSITION ARRAYS; LASER AB We present model calculations demonstrating new density and temperature sensitive ratios of groups of F- and Ne-like Xe lines which are suitable for diagnosing plasma conditions. The method is illustrated by using L-shell Xe emission to infer T(e) in the fuel region of indirectly driven plastic capsules filled with deuterium and doped with 0.1% Ar and 0.02% Xe. The technique uses tractable atomic models and appears scalable to other Ne-like ions. RP KEANE, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 14 TC 40 Z9 42 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 9 PY 1994 VL 72 IS 19 BP 3029 EP 3032 DI 10.1103/PhysRevLett.72.3029 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700014 ER PT J AU CHASON, E MAYER, TM KELLERMAN, BK MCILROY, DT HOWARD, AJ AF CHASON, E MAYER, TM KELLERMAN, BK MCILROY, DT HOWARD, AJ TI ROUGHENING INSTABILITY AND EVOLUTION OF THE GE(001) SURFACE DURING ION SPUTTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID BOMBARDMENT; ENERGY; SI AB We have investigated the temperature-dependent roughening kinetics of Ge surfaces during low energy ion sputtering using energy dispersive x-ray reflectivity. At 150-degrees-C and below, the surface is amorphized by ion impact and roughens to a steady state small value. At 250-degrees-C the surface remains crystalline, roughens exponentially with time, and develops a pronounced ripple topography. At higher temperature this exponential roughening is slower, with an initial sublinear time dependence. A model that contains a balance between smoothing by surface diffusion and viscous flow and roughening by atom removal explains the kinetics. Ripple formation is a result of a curvature-dependent sputter yield. RP CHASON, E (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 25 TC 312 Z9 312 U1 4 U2 23 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 9 PY 1994 VL 72 IS 19 BP 3040 EP 3043 DI 10.1103/PhysRevLett.72.3040 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700017 ER PT J AU ZUO, JK WENDELKEN, JF DURR, H LIU, CL AF ZUO, JK WENDELKEN, JF DURR, H LIU, CL TI GROWTH AND COALESCENCE IN SUBMONOLAYER HOMOEPITAXY ON CU(100) STUDIED WITH HIGH-RESOLUTION LOW-ENERGY-ELECTRON DIFFRACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE-DIFFUSION; NUCLEATION; SI(001); SI AB By measuring the dependence of the island separation L on the flux F during submonolayer epitaxy on Cu(100), the scaling exponent p in L is similar to F-p/2 is determined in the steady-state and island coalescence regimes. In both regimes at low temperature (223 K), a crossover of p is observed from a low-flux value of 1/3 to a high-flux value of 1/2. At elevated temperatures (263-305 K), p is similar to 3/5 is obtained. These results agree with classic nucleation theories and recent Monte Carlo simulations, and imply that the smallest stable island changes directly to a tetramer from a low-temperature dimer with increasing temperature. Dissociation energy calculations using the embedded-atom method support these results. C1 SW MISSOURI STATE UNIV,DEPT PHYS & ASTRON,SPRINGFIELD,MO 65804. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP ZUO, JK (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Durr, Hermann/F-6205-2012 NR 24 TC 102 Z9 105 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 9 PY 1994 VL 72 IS 19 BP 3064 EP 3067 DI 10.1103/PhysRevLett.72.3064 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700023 ER PT J AU CRAIEVICH, PJ WEINERT, M SANCHEZ, JM WATSON, RE AF CRAIEVICH, PJ WEINERT, M SANCHEZ, JM WATSON, RE TI LOCAL STABILITY OF NONEQUILIBRIUM PHASES SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSITION-METALS; ELECTRONIC-STRUCTURE; LATTICE STABILITIES; ORBITAL METHOD; ELEMENTS; FULL AB The relative structural stability of the transition metals and their alloys for a tetragonal deformation is investigated. Total energy calculations demonstrate that the nonequilbrium cubic structures are locally unstable with respect to this deformation mode at low temperatures, i.e., the cubic elastic constants (c11 - c12) are negative. Thus, these phases are not appropriate reference states for alloy phase diagram constructs and if such phases do occur at high temperature, the local stability must be due in large part to entropy contributions to the free energy. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP CRAIEVICH, PJ (reprint author), UNIV TEXAS,CTR MAT SCI & ENGN,AUSTIN,TX 78712, USA. NR 17 TC 131 Z9 132 U1 5 U2 19 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 9 PY 1994 VL 72 IS 19 BP 3076 EP 3079 DI 10.1103/PhysRevLett.72.3076 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700026 ER PT J AU LI, DQ FREITAG, M PEARSON, J QIU, ZQ BADER, SD AF LI, DQ FREITAG, M PEARSON, J QIU, ZQ BADER, SD TI MAGNETIC PHASES OF ULTRATHIN FE GROWN ON CU(100) AS EPITAXIAL WEDGES SO PHYSICAL REVIEW LETTERS LA English DT Article ID CENTERED-CUBIC IRON; FCC-FE; ELECTRONIC-STRUCTURE; FILMS; ANTIFERROMAGNETISM; PHOTOEMISSION; TEMPERATURE; FE/CU(100); CU(001); BCC AB Magnetic wedges of Fe on Cu(100) are explored magneto-optically. In the region of 6-11 monolayers (ML) of fcc Fe grown at room temperature, in addition to a surface ferromagnetic layer with a Curie temperature approximately 250 K, the Fe bulk is antiferromagnetic with a Neel temperature of approximately 200 K. This fcc phase is stable only above a growth temperature of order approximately 200 K, below which the ferromagnetic spin-reorientation transition occurs at approximately 6 ML. The phase boundaries are delineated by cusps in the coercivity along the wedge. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP LI, DQ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Qiu, Zi Qiang/O-4421-2016 OI Qiu, Zi Qiang/0000-0003-0680-0714 NR 37 TC 307 Z9 307 U1 0 U2 7 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 9 PY 1994 VL 72 IS 19 BP 3112 EP 3115 DI 10.1103/PhysRevLett.72.3112 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700035 ER PT J AU WONG, AY SENSHARMA, DK TANG, AW SUCHANNEK, RG HO, D AF WONG, AY SENSHARMA, DK TANG, AW SUCHANNEK, RG HO, D TI OBSERVATION OF CHARGE-INDUCED RECOVERY OF OZONE CONCENTRATION AFTER CATALYTIC DESTRUCTION BY CHLOROFLUOROCARBONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB Experiments in large chambers demonstrate for the first time the recovery of ozone after catalytic destruction by chlorine atoms released from CFCl3 under uv radiation. Recovery is brought about by charge attachment to chlorine atoms which encounter a current of low-energy negative charges. These negative chlorine ions do not destroy ozone catalytically and can be collected by positively biased surfaces. The observed recovery of the ozone concentration is in quantitative agreement with a model of successive charge transfers to chlorine to form negative ions. The inclusion of minority ions does not affect our conclusion. Present results can lead to remediation of stratospheric ozone depletion. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WONG, AY (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 8 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 9 PY 1994 VL 72 IS 19 BP 3124 EP 3127 DI 10.1103/PhysRevLett.72.3124 PG 4 WC Physics, Multidisciplinary SC Physics GA NK457 UT WOS:A1994NK45700038 ER PT J AU BASU, C ROY, CL MACIA, E DOMINGUEZADAME, F SANCHEZ, A AF BASU, C ROY, CL MACIA, E DOMINGUEZADAME, F SANCHEZ, A TI LOCALIZATION OF RELATIVISTIC ELECTRONS IN A ONE-DIMENSIONAL DISORDERED SYSTEM SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID STATES; LATTICES AB We address the question as to whether relativistic effects have any influence on localization phenomena in disordered systems. Starting from the Schrodinger and Dirac equations for Kronig-Penney potentials, we derive their discrete counterparts within the framework of the linear combination of atomic orbitals and tight-binding approaches, As a specific example we subsequently focus on substitutional binary alloys, We show that taking relativity into account leads to many important differences with respect to the results obtained in the non-relativistic approximation. The predicted behaviour of localization length can be very relevant in several experimental contexts. C1 UNIV COMPLUTENSE MADRID,FAC FIS,DEPT FIS MAT,E-28040 MADRID,SPAIN. UNIV CARLOS III MADRID,ESCUELA POLITECN SUPER,E-28913 LEGANES,SPAIN. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BASU, C (reprint author), INDIAN INST TECHNOL,DEPT PHYS & METEOROL,KHARAGPUR 721302,W BENGAL,INDIA. RI Sanchez, Angel/A-9229-2008; Dominguez-Adame, Francisco/E-4277-2010 OI Sanchez, Angel/0000-0003-1874-2881; Dominguez-Adame, Francisco/0000-0002-5256-4196 NR 21 TC 8 Z9 8 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD MAY 7 PY 1994 VL 27 IS 9 BP 3285 EP 3291 DI 10.1088/0305-4470/27/9/037 PG 7 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA NM532 UT WOS:A1994NM53200037 ER PT J AU KALTSOYANNIS, N AF KALTSOYANNIS, N TI A THEORETICAL INVESTIGATION OF THE BONDING OF EARLY TRANSITION-METALS TO TELLURIUM SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; MULTIPLE BONDS; SPECTRA; TICL4; COMPLEXES; STATE; OSO4 AB Non-relativistic and relativistic discrete variational Xalpha calculations have been performed on the model complexes [W(PH3)4E2] (E = O, S or Te). The results are consistent with the formal description of the compounds as eighteen-electron tungsten(iv) d2 systems. Metal-chalcogen sigma bonding becomes increasingly covalent as the chalcogen is altered from 0 to Te, while the almost equal tungsten and chalcogen contributions to the pi levels remain more constant. Ligand-based spin-orbit coupling effects are substantial in [W(PH3)4Te2] and smaller for [W(PH3)4S2] and [W(PH3)4O2]. Mixing of the sigma/pi character of the non-relativistic 3a1 (W-Te sigma) and 3e (Te 5p(pi) lone pair) molecular orbitals of [W(PH3)4Te2] occurs in the relativistic calculations. A similar effect is seen in the le (W-O pi) and 2a1 (W-O sigma) levels of [W(PH3)4O2]. The theoretical results are in good agreement with the experimental electronic absorption spectra of [W(PMe3)4E2] (E = S, Se or Te). The bonding in the model complex [Zr(TeSiH3)4] is discussed in conjunction with the closely related ZrI4. The separation of the metal-ligand sigma and pi levels is significantly greater in the tellurium compound. Previous predictions for the spin-orbit splitting of the t2(sigma) and t2(pi) subshells of Group IVA tetrahalides are reproduced more closely in [Zr(TeSiH3)4] than in ZrI4, in which there is substantial t2(sigma)-t2(pi) mixing. Attempts to assign the valence photoelectron spectra of MX4 (M = Ti, Zr or Hf; X = Br or 1) in terms of the earlier theoretical model are considered to be inappropriate in light of the lack of t2(sigma)-t2(pi) separation. Comparison of the metal-tellurium bonding in [W(PH3)4Te2] with that in [Zr(TeSiH3)4] suggests that the former is significantly more covalent. RP KALTSOYANNIS, N (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. OI Kaltsoyannis, Nikolas/0000-0003-0293-5742 NR 54 TC 14 Z9 14 U1 0 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0300-9246 J9 J CHEM SOC DALTON JI J. Chem. Soc.-Dalton Trans. PD MAY 7 PY 1994 IS 9 BP 1391 EP 1400 DI 10.1039/dt9940001391 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NL113 UT WOS:A1994NL11300010 ER PT J AU GOUDER, TH COLMENARES, CA AF GOUDER, TH COLMENARES, CA TI MODIFICATION OF THE ELECTRONIC-STRUCTURE OF PD BY U-FILMS - CHEMISORPTION OF CO SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID SURFACE; SPECTROSCOPY; ADSORPTION; URANIUM AB X-Ray and ultraviolet photoelectron spectroscopies (XPS and UPS), Auger electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) have been used to study the coadsorption of CO and U on polycrystalline Pd. We investigated the modification of the electronic structure of Pd at low U coverages and the mode of CO chemisorption (dissociative vs. associative) as a function of surface U concentration. U adsorption results in the narrowing of the Pd 4d band. At low U coverages the density of states (DOS) at the Fermi level decreases and the U 5f electrons are localized. The CO saturation coverage at room temperature decreases with increasing U surface concentration, while CO adsorption at -165-degrees-C is less affected. This is attributed mainly to a decrease of CO chemisorption energy but also to blocking of Pd adsorption sites by U. A decrease in the heat of chemisorption for CO is explained by a change of the electronic structure of Pd by U. At low dosage U itself loses most of its reactivity, probably because of U-Pd solid-state bonding and below a critical U surface concentration CO dissociation becomes an activated process. High-temperature reaction between CO and U-covered surfaces leads to the partial transformation of U into a surface oxycarbide. In the presence of this compound some CO is chemisorbed strongly on the surface and is stable even at 300-degrees-C, in contrast to CO on Pd metal. A similar effect has also been observed for classical promoters such as the alkali metals. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 24 TC 2 Z9 2 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD MAY 7 PY 1994 VL 90 IS 9 BP 1285 EP 1291 DI 10.1039/ft9949001285 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NK959 UT WOS:A1994NK95900015 ER PT J AU FADLEY, CS THEVUTHASAN, S KADUWELA, AP WESTPHAL, C KIM, YJ YNZUNZA, R LEN, P TOBER, E ZHANG, F WANG, Z RUEBUSH, S BUDGE, A VANHOVE, MA AF FADLEY, CS THEVUTHASAN, S KADUWELA, AP WESTPHAL, C KIM, YJ YNZUNZA, R LEN, P TOBER, E ZHANG, F WANG, Z RUEBUSH, S BUDGE, A VANHOVE, MA TI PHOTOELECTRON DIFFRACTION AND HOLOGRAPHY - PRESENT STATUS AND FUTURE-PROSPECTS SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article; Proceedings Paper CT 5th International Conference on Electron Spectroscopy (ICES 5) CY JUL 25-AUG 01, 1993 CL INST THEORET PHYS, KIEV, UKRAINE SP ACAD SCI UKRAINE HO INST THEORET PHYS ID X-RAY PHOTOELECTRON; ELECTRON-EMISSION HOLOGRAPHY; SURFACE PHASE-TRANSITION; CORE-LEVEL PHOTOEMISSION; AUGER-ELECTRON; MULTIPLE-SCATTERING; SPIN POLARIZATION; ATOMIC-RESOLUTION; ENERGY; WAVE AB Photoolectron diffraction and photoelectron holography, a newly developed variant of it, can provide a rich range of information concerning surface structure. These methods are sensitive to atomic type, chemical state, and spin state. The theoretical prediction of diffraction patterns is also well developed at both the single scattering and multiple scattering levels, and quantitative fits of experiment to theory can lead to structures with accuracies in the +/-0.03 angstrom range. Direct structural information can also be derived from forward scattering in scanned-angle measurements at higher energies, from path length differences contained in scanned-energy data at lower energies, and from holographic inversions of data sets spanning some region in angle and energy space. Diffraction can also affect average photoelectron emission depths. Circular dichroism in core-level emission can be fruitfully interpreted in terms of photoelectron diffraction theory, as can measurements with spin-resolved core-spectra, and studies of surface magnetic structures and phase transitions should be possible with these methods. Synchrotron radiation is a key element of fully utilizing these techniques. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV HAWAII MANOA,DEPT CHEM,HONOLULU,HI 96822. RP FADLEY, CS (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI Van Hove, Michel/A-9862-2008; OI Van Hove, Michel/0000-0002-8898-6921; Kaduwela, Ajith/0000-0002-7236-2698 NR 96 TC 38 Z9 38 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD MAY 6 PY 1994 VL 68 BP 19 EP 47 DI 10.1016/0368-2048(94)02101-5 PG 29 WC Spectroscopy SC Spectroscopy GA NP538 UT WOS:A1994NP53800003 ER PT J AU SHIRLEY, DA YU, Z PETERSEN, BL HUSSAIN, Z HUFF, WA BARTON, JJ TERMINELLO, LJ AF SHIRLEY, DA YU, Z PETERSEN, BL HUSSAIN, Z HUFF, WA BARTON, JJ TERMINELLO, LJ TI TOWARD A SURFACE PHOTOELECTRON DIFFRACTOMETER - A PROGRESS REPORT ON SELECTED ADVANCES AND AN ASSESSMENT SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article; Proceedings Paper CT 5th International Conference on Electron Spectroscopy (ICES 5) CY JUL 25-AUG 01, 1993 CL INST THEORET PHYS, KIEV, UKRAINE SP ACAD SCI UKRAINE HO INST THEORET PHYS ID EXTENDED FINE-STRUCTURE; AUGER-ELECTRON; SCATTERING; MULTIPLE; DIFFRACTION; ENERGY AB X-ray diffractometric determination of atomic structures in ordered bulk systems is highly automated and has wide application. By contrast, surface crystallography, whether based on photon or electron scattering, is still in a relatively early stage of development. A summary is given of recent selected highlights in efforts to make progress toward surface photoelectron diffractometry and holography by our Berkeley-Penn State group. It is concluded that an automated photoelectron diffractometer is practical and desirable. C1 PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SHIRLEY, DA (reprint author), PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802, USA. NR 18 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD MAY 6 PY 1994 VL 68 BP 49 EP 61 DI 10.1016/0368-2048(94)02102-3 PG 13 WC Spectroscopy SC Spectroscopy GA NP538 UT WOS:A1994NP53800004 ER PT J AU COLE, RJ WEIGHTMAN, P JENNISON, DR STECHEL, EB AF COLE, RJ WEIGHTMAN, P JENNISON, DR STECHEL, EB TI PHOTOIONIZATION CROSS-SECTIONS AS A PROBE OF 4D HYBRIDIZATION IN DILUTE AG ALLOYS SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID COOPER-MINIMUM; VALENCE-BAND; ASYMMETRY PARAMETER; STATES; PHOTOEMISSION; SUBSHELL; PD AB The photon energy dependence of the photoionisation cross-section of 4d valence levels is observed to be sensitive to the chemical environment. We discuss the modification of the cross-section variation with photon energy in terms of the hybridisation of the 4d orbitals of Ag impurities in Al and Cd hosts. C1 UNIV LIVERPOOL, SURFACE SCI RES CTR, LIVERPOOL L69 3BX, ENGLAND. SANDIA NATL LABS, DEPT 1114, ALBUQUERQUE, NM 87185 USA. RP UNIV LIVERPOOL, DEPT PHYS, LIVERPOOL L69 3BX, ENGLAND. RI Stechel, Ellen/B-1253-2012 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 0368-2048 EI 1873-2526 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD MAY 6 PY 1994 VL 68 BP 139 EP 143 DI 10.1016/0368-2048(94)02110-4 PG 5 WC Spectroscopy SC Spectroscopy GA NP538 UT WOS:A1994NP53800012 ER PT J AU NELSON, AJ NILES, DW SCHWERDTFEGER, CR WEI, SH ZUNGER, A HOCHST, H AF NELSON, AJ NILES, DW SCHWERDTFEGER, CR WEI, SH ZUNGER, A HOCHST, H TI PREDICTION AND OBSERVATION OF II-VI-CUINSE2 HETEROJUNCTION BAND OFFSETS SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID III-V SEMICONDUCTORS; SCHOTTKY-BARRIER; CUINSE2; CUGASE2; DIPOLES; MODEL AB First-principles band structure calculations show that II-VI/CuInSe2 heterojunctions have significant band offsets which challenge the traditional explanation of device operation. In the case of ZnSe, these large valence band offsets demonstrate the failure of the ''common anion rule''. This is traced to a stronger Cu,d-Se,p level repulsion in CuInSe2 than the Zn,d-Se,p repulsion in ZnSe. Formation of the ZnSe/CuInSe2 and CdS/CuInSe2 heterojunctions were studied by synchrotron radiation soft x-ray photoemission spectroscopy. The II-VI overlayers were sequentially grown in steps on both CuInSe2(112) single-crystals and polycrystalline thin-films. In-situ photoemission measurements were acquired after each growth in order to observe changes in the valence band electronic structure as well as changes in the appropriate core lines. Results of these measurements reveal that the offsets are in good agreement with the first-principles predictions and that the traditional device model with DELTAE(C) < 0 must be abandoned. C1 UNIV WISCONSIN, SYNCHROTRON RADIAT CTR, STOUGHTON, WI 53589 USA. RP NATL RENEWABLE ENERGY LAB, 1617 COLE BLVD, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 32 TC 18 Z9 18 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 EI 1873-2526 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD MAY 6 PY 1994 VL 68 BP 185 EP 193 DI 10.1016/0368-2048(94)02116-3 PG 9 WC Spectroscopy SC Spectroscopy GA NP538 UT WOS:A1994NP53800018 ER PT J AU TRAHANOVSKY, WS HUANG, YCJ LEUNG, MK AF TRAHANOVSKY, WS HUANG, YCJ LEUNG, MK TI EFFECTS OF ALPHA-TERT-BUTYL GROUP SUBSTITUTION ON THE REACTIVITY AND DIMERIZATION PRODUCTS OF FURAN-BASED O-QUINODIMETHANES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID FLASH VACUUM PYROLYSIS AB Flash vacuum pyrolysis (FVP) of 2-neopentyl-3-furylmethyl benzoate (8) produces 3-methylene-2-(tert-butylmethylene)-2,3-dihydrofuran (5), the major product as shown by low-temperature H-1 NMR spectroscopy. Upon warming to room temperature, 5 dimerizes giving mostly two stereoisomeric [4 + 2] dimers 11a and 11b in addition to a small amount of the [4 + 4] dimer 12. FVP of a mixture of the two [4 + 2] dimers 11a and 11b gives the thermodynamically more stable [4 + 4] dimer 12. The rate constants for the dimerization of 5 in solution at temperatures from -29 to +5 OC were determined by H-1 NMR spectroscopy The rate constants and activation parameters (Delta H-double dagger = 10.8 kcal/mol, Delta S-double dagger = -28.8 eu) are very similar to those reported for the unsubstituted furan-based o-quinodimethane. FVP of (2-methyl-3-furyl)(tert-butyl)methyl benzoate (13) and (2-neopentyl-3-furyl)(tert-butyl)methyl benzoate (18) give as the major product, 2-methylene-3-(tert-butylmethylene)-2,3-dihydrofuran (6) and 2,3-bis(tert-butylmethylene)-2,3-dihydro (7), respectively. Compounds 6 and 7, in contrast to 5, are stable at room temperature apparently because for each of these compounds a bulky tert-butyl group is on the more reactive methylene, the S-methylene. These results offer further support for the mechanism for the dimerization of furan-based o-quinodimethanes which proceeds in two steps via a transient diradical intermediate. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP TRAHANOVSKY, WS (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 15 TC 13 Z9 13 U1 0 U2 2 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 6 PY 1994 VL 59 IS 9 BP 2594 EP 2598 DI 10.1021/jo00088a050 PG 5 WC Chemistry, Organic SC Chemistry GA NL362 UT WOS:A1994NL36200050 ER PT J AU TRAHANOVSKY, WS CHOU, CH CASSADY, TJ AF TRAHANOVSKY, WS CHOU, CH CASSADY, TJ TI EFFECTS OF 5-TERT-BUTYL AND 5-METHYL GROUP SUBSTITUTION ON THE REACTIVITY AND DIMERIZATION PRODUCTS OF FURAN-BASED O-QUINODIMETHANES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Note C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP TRAHANOVSKY, WS (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 9 TC 10 Z9 10 U1 1 U2 1 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 6 PY 1994 VL 59 IS 9 BP 2613 EP 2615 DI 10.1021/jo00088a054 PG 3 WC Chemistry, Organic SC Chemistry GA NL362 UT WOS:A1994NL36200054 ER PT J AU DU, Q FREYSZ, E SHEN, YR AF DU, Q FREYSZ, E SHEN, YR TI SURFACE VIBRATIONAL SPECTROSCOPIC STUDIES OF HYDROGEN-BONDING AND HYDROPHOBICITY SO SCIENCE LA English DT Article ID MOLECULAR-DYNAMICS; WATER; MONOLAYERS; INTERFACE AB Surface vibrational spectroscopy by sum-frequency generation was used to study hydrophobicity at the molecular level at various interfaces: water-surfactant-coated quartz, water-hexane, and water-air. In all cases, hydrophobicity was characterized by the appearance of dangling hydroxyl bonds on 25 percent of the surface water molecules. At the water-quartz interface, packing restrictions force the water surface layer to have a more ordered, ice-like structure. A partly wettable water-quartz interface was also studied. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 23 TC 504 Z9 505 U1 11 U2 137 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 6 PY 1994 VL 264 IS 5160 BP 826 EP 828 DI 10.1126/science.264.5160.826 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NJ949 UT WOS:A1994NJ94900027 PM 17794723 ER PT J AU KIM, YW LABOURIAU, A TAYLOR, CM EARL, WL WERBELOW, LG AF KIM, YW LABOURIAU, A TAYLOR, CM EARL, WL WERBELOW, LG TI NMR-STUDY OF THE SOLUTION-STATE DYNAMICS AND SOLID-STATE STRUCTURE OF TRI-N-BUTYLTIN FLUORIDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MAGNETIC-RESONANCE; RELAXATION; C-13; SPECTRA; POLYMERS; MOTION AB Dynamics and structure of tri-n-butyltin fluoride in n-hexane solutions were probed using (tin-119) nuclear magnetic resonance spin relaxation methodologies. Significant relaxation-induced polarization transfer effects were observed and exploited. The experimental observations indicate that the tri-n-butyl fluoride exists in a polymeric form in solution. For a 0.10% (w/w) solution at 25 degrees C, NMR reveals significant orientational/exchange relaxation on both the microsecond and nanosecond time scales. Solution-state and solid-state parameters are compared and contrasted. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 27 TC 6 Z9 6 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 5 PY 1994 VL 98 IS 18 BP 4919 EP 4922 DI 10.1021/j100069a025 PG 4 WC Chemistry, Physical SC Chemistry GA NJ975 UT WOS:A1994NJ97500025 ER PT J AU BURRELL, AK CLARK, DL GORDON, PL SATTELBERGER, AP BRYAN, JC AF BURRELL, AK CLARK, DL GORDON, PL SATTELBERGER, AP BRYAN, JC TI SYNTHESES AND MOLECULAR AND ELECTRONIC-STRUCTURES OF TRIS(ARYLIMIDO)TECHNETIUM(VI) AND TRIS(ARYLIMIDO)TECHNETIUM(V) COMPLEXES DERIVED FROM SUCCESSIVE ONE-ELECTRON REDUCTIONS OF TRIS(ARYLIMIDO)IODOTECHNETIUM(VII) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID RAY CRYSTAL-STRUCTURES; TRANSITION-METAL ATOMS; TECHNETIUM COMPLEXES; TRIPLE BONDS; IMIDO LIGAND; CHEMISTRY; PLANAR AB Reduction of Tc(NAr')(3)I (Ar' = 2,6-dimethylphenyl) by 1 equiv of sodium generates the edge-bridged tetrahedral dimer complex TC2(NAr')(4)(mu-NAr')(2). In contrast, reduction of the more sterically hindered Tc(NAr)(3)I (Ar = 2,6-diisopropylphenyl) by 1 equiv of elemental sodium yields the ''ethane-like'' dimer Tc-2(NAr)(6), which can be further reduced with another equivalent of sodium (per technetium) to produce Tc(NAr)(3)(-). Tc(NAr)(3)(-) reacts with sources of metal cations such as HgBr2 and ClAu(PPh(3)) to form (ArN)(3)TcHgBr, (ArN)(3)TcHgTc(NAr)(3), and (ArN)(3)TcAu(PPh(3)). Tc(NAr)(3)(-) also reacts with MeI to form Tc(NAr)(3)Me and with Tc(NAr)(3)I to form the ''ethane-like'' dimer Tc-2(NAr)(6). X-ray structural characterization of the ethane-like Tc-2(NAr)(6) reveals unbridged Tc-Tc and Tc-N distances of 2.744(1) and 1.758(2) Angstrom, respectively. X-ray characterization of the tetrahedral edge-bridged Tc-2(NAr')(6) reveals averaged Tc-Tc, Tc-N, and Tc-mu-N distances of 2.681(2), 1.750(8), and 1.954(7) Angstrom, respectively. X-ray analysis of (ArN)(3)TcAuPPh(3) reveals Tc-Au, Tc=N, and Au-P distances of 2.589(1), 1,758(5), and 2.278(2) Angstrom, respectively. Tc-Au-P, Au-Tc-N, and N-Tc-N angles are 180.0(1), 97.2(1), and 118.4(1)degrees. X-ray analysis of [Tc(NAr)(3)]Hg-2 gives Tc-Hg and Tc-N distances of 2.615(1) and 1.718(10) Angstrom and Tc-Hg-Tc, Hg-Tc-N, and N-Tc-N angles of 180.0(1), 97.6(4), and 118.3(2)degrees. Fenske-Hall molecular orbital calculations have been used to probe the electronic structure and bonding of tetrahedral edge-bridged and staggered ethane-like dimeric isomers of d(1)-d(1) Tc-2(NH)(6). A ''frozen pi-orbital'' method was utilized to separate sigma- and pi-bonding effects of the imido ligand to the dinuclear metal centers. Crystals of Tc-2(NAr')(4)(mu-NAr')(2) are monoclinic (P2(1)/n) with a = 19.500(8) Angstrom, b = 10.497(6) Angstrom, c = 22.684(8) Angstrom, beta = 110.37(3)degrees, V = 4353 Angstrom(3), rho(calc) = 1.39 g.cm(-3), and Z = 4. Crystals of (ArN)(3)TcHgTc(NAr)(3) are cubic (Pa (3) over bar) with a = 19.560(3) Angstrom, V= 7484 Angstrom(3), rho(calc) = 1.29 g.cm(-3), and Z = 8. Crystals of (ArN)(3)TcAu(PPh(3)) are rhombohedral (R (3) over bar) with a = 14.943(3) Angstrom, c 39.607(12) Angstrom, V = 7657 Angstrom(3), rho(calc) = 1.41 g.cm(-3), and Z = 6. C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,SCI & TECHNOL BASE PROGRAMS,DSTBP,LOS ALAMOS,NM 87545. RI Clark, David/A-9729-2011 NR 55 TC 22 Z9 22 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 4 PY 1994 VL 116 IS 9 BP 3813 EP 3821 DI 10.1021/ja00088a018 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA NJ946 UT WOS:A1994NJ94600018 ER PT J AU SMITH, TA DEWITT, JG HEDMAN, B HODGSON, KO AF SMITH, TA DEWITT, JG HEDMAN, B HODGSON, KO TI SULFUR AND CHLORINE K-EDGE X-RAY-ABSORPTION SPECTROSCOPIC STUDIES OF PHOTOGRAPHIC MATERIALS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID FINE-STRUCTURE; FLUORESCENCE DETECTION; SPECTRA; ADSORPTION; INNER; PHOTOABSORPTION; EXCITATION; DYES AB The sulfur and chlorine centers in sensitizing dyes and surface-modifying agents of importance to the photographic system were characterized by S and Cl K-edge X-ray absorption spectroscopy (XAS). The K-edge spectra of these compounds reveal sharp, characteristic absorption features that provide direct information about the local electronic and geometric environment of the absorber centers. In particular, a sharp, intense pre-edge feature at 2470-2472 eV is observed in the spectra of compounds containing exocyclic S (thione or thiol) that has no counterpart in the spectra of thiazole-containing (cyclic S) compounds. Single-crystal polarized spectra reveal that the edge features of these compounds exhibit a strong orientational dependence, permitting the assignment of some of the observed features. The exocyclic S pre-edge feature was assigned to a S 1s --> pi* transition, while the predominant spectral feature at 2473-2474 eV observed in all of the S K-edge spectra was found to be polarized along the C-S bond direction and assigned to a S 1s --> sigma* transition. Dramatic changes in the sulfur-ligand spectral features are produced from complexation with Ag and Au atoms, which permits the distinction of covalent vs ionic interactions with the metals encountered in photographic systems. Covalent metal interaction with an exocyclic S-containing ligand resulted in the disappearance of the low-energy pi* pre-edge feature, while the intensity of the predominant sigma* feature in all compounds investigated was greatly enhanced upon complexation with Au and Ag metals. In contrast to the uncomplexed ligands, this predominant feature was found to be most intense for polarizations along the S-metal direction and perpendicular to the C-S bond, indicating a direct bonding interaction with the Au metal, as seen, for example, in a bis(ethylenethiourea) Au(I) complex. The K-edge spectra of Cl centers, present as substituents on the ring system of the dye molecules, exhibit a single predominant feature at approximately 2825 eV, which is characteristic of the terminal C-Cl environment and is relatively insensitive to structural changes in the dye systems more remote from the Cl centers. Single-crystal measurements revealed that this spectral feature is polarized predominantly along the C-Cl bond direction, indicating that it is due primarily to a Cl 1s --> sigma* transition with some contribution from a lower-intensity transition to a near-lying pi-symmetry orbital. The results of these studies form the basis for the interpretation of polarized surface measurements at a glancing angle configuration of a dyed AgBr sheet crystal, which suggest that there is no covalent interaction between the terminal sulfur centers in the merocyanine dye molecules and the silver ions on the AgBr substrate surface. In addition, the polarization properties of the S and Cl K-edge features provide insight into the orientation of the dye molecules on the AgBr substrate, indicating that the dye molecules are adsorbed in an edge-on fashion. C1 STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP SMITH, TA (reprint author), EASTMAN KODAK CO,IMAGING RES & ADV DEV,ROCHESTER,NY 14650, USA. NR 34 TC 24 Z9 24 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 4 PY 1994 VL 116 IS 9 BP 3836 EP 3847 DI 10.1021/ja00088a020 PG 12 WC Chemistry, Multidisciplinary SC Chemistry GA NJ946 UT WOS:A1994NJ94600020 ER PT J AU GEIERSTANGER, BH VOLKMAN, BF KREMER, W WEMMER, DE AF GEIERSTANGER, BH VOLKMAN, BF KREMER, W WEMMER, DE TI SHORT PEPTIDE-FRAGMENTS DERIVED FROM HMG-I/Y PROTEINS BIND SPECIFICALLY TO THE MINOR-GROOVE OF DNA SO BIOCHEMISTRY LA English DT Article ID DISTAMYCIN-A; MOTIFS; COMPLEX; SPKK; GENE; NMR AB Short peptides derived from chromosomal proteins have previously been proposed to bind specifically to the minor groove of A,T-rich DNA [for a review, see M. E. A. Churchill and A. A, Travers (1991) Trends Biochem. Sci. 16, 92-97]. Using NMR spectroscopy, we investigated the DNA binding of SPRKSPRK, which is one such A,T-specific motif. Under the conditions studied SPRKSPRK interacts only nonspecifically with d(CGCAAAAAAGGC).d(GCCTTTTTTGCG). The peptides TPKRPRGRPKK, PRGRPKK, and PRGRP derived from the non-histone chromosomal protein HMG-I/Y, however, bind specifically to the central A,T sites of d(CGCAAATTTGCG)(2) and d(CGCGAATTCGCG)(2). 2D NOE measurements show that the RGR segment of each peptide is in contact with the minor groove. The arginine side chains and the peptide backbone are buried deep in the minor groove, in a fashion generally similar to the antibiotic netropsin. Under the same conditions the-peptide PKGKP does not interact with the same oligonucleotide duplexes, indicating that the arginine guanidinium groups are major determinants of the A,T specificity. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,GRAD GRP BIOPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM-43129] NR 28 TC 87 Z9 87 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 3 PY 1994 VL 33 IS 17 BP 5347 EP 5355 DI 10.1021/bi00183a043 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NJ859 UT WOS:A1994NJ85900043 PM 8172908 ER PT J AU FENG, ZC KWAK, BS ERBIL, A BOATNER, LA AF FENG, ZC KWAK, BS ERBIL, A BOATNER, LA TI RAMAN-SCATTERING AND X-RAY-DIFFRACTION INVESTIGATIONS OF HIGHLY TEXTURED (PB1-XLAX)TIO3 THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; PBTIO3; MODES AB Highly textured lead lanthanum titanate (PLT) thin films grown on Si(100) substrates by the metalorganic chemical vapor deposition technique are characterized using x-ray diffraction (XRD), Raman spectroscopy, and energy-dispersive x-ray analysis. The texturing consisted of an alignment of the {100} crystallographic axes of the film perpendicular to the Si substrate. The tetragonality of the films was found to decrease as the lanthanum concentration increased. Raman spectra exhibited features characteristic of bulk PLT, including the observation of the soft mode. Variations of the phonon modes for PLT have been investigated as a function of La concentration and sample temperature. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FENG, ZC (reprint author), NATL UNIV SINGAPORE,DEPT PHYS,SINGAPORE 0511,SINGAPORE. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 13 TC 13 Z9 16 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 2 PY 1994 VL 64 IS 18 BP 2350 EP 2352 DI 10.1063/1.111611 PG 3 WC Physics, Applied SC Physics GA NK026 UT WOS:A1994NK02600008 ER PT J AU CAO, WQ HUNT, AJ AF CAO, WQ HUNT, AJ TI PHOTOLUMINESCENCE OF CHEMICALLY VAPOR-DEPOSITED SI ON SILICA AEROGELS SO APPLIED PHYSICS LETTERS LA English DT Article ID POROUS SILICON; VISIBLE LUMINESCENCE; WAFERS; FILMS AB We have prepared in situ porous Si by the decomposition of SiH4 at 500-degrees-C on an aerogel substrate. Electron microscopy studies indicate that the as-deposited Si is primarily amorphous while the sample annealed in Ar at 800-degrees-C has various nanometer-sized crystalline Si particles. Visible photoluminescence (PL) can be observed only from the annealed sample and the PL peak red shifts with the annealing temperature from 800-degrees to 1000-degrees-C. The results support the quantum confinement theory as the luminescence mechanism in porous Si. RP CAO, WQ (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 22 TC 18 Z9 19 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 2 PY 1994 VL 64 IS 18 BP 2376 EP 2378 DI 10.1063/1.111619 PG 3 WC Physics, Applied SC Physics GA NK026 UT WOS:A1994NK02600017 ER PT J AU ASHBY, CIH ZAVADIL, KR HOWARD, AJ HAMMONS, BE AF ASHBY, CIH ZAVADIL, KR HOWARD, AJ HAMMONS, BE TI ULTRAVIOLET PHOTOSULFIDATION OF III-V COMPOUND SEMICONDUCTORS - A NEW APPROACH TO SURFACE PASSIVATION SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS-SURFACES; HYDROGEN AB A new passivation technique for III-V compound semiconductors based on ultraviolet photolysis of elemental sulfur vapor has been developed. Photosulfidation produces a greater increase in the photoluminescence intensity from GaAs samples than that produced by conventional (NH4)2S dip treatments and is more photostable than the conventional wet process. X-ray photoelectron spectroscopy of the photosulfided GaAs surfaces indicate formation of a surface sulfide rather than the disulfide characteristic of the (NH4)2S process. RP ASHBY, CIH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Schaff, William/B-5839-2009 NR 20 TC 14 Z9 14 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 2 PY 1994 VL 64 IS 18 BP 2388 EP 2390 DI 10.1063/1.111623 PG 3 WC Physics, Applied SC Physics GA NK026 UT WOS:A1994NK02600021 ER PT J AU CHISHOLM, MF PENNYCOOK, SJ JEBASINSKI, R MANTL, S AF CHISHOLM, MF PENNYCOOK, SJ JEBASINSKI, R MANTL, S TI NEW INTERFACE STRUCTURE FOR A-TYPE COSI2/SI(111) SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRON-MICROSCOPY; ATOMIC-STRUCTURE; CO ATOMS; 111 SI; COORDINATION; SI(111) AB A new model of a CoSi2/Si(111) interface structure has been generated using images produced by Z-contrast scanning transmission electron microscopy. The images indicate that the top and bottom interfaces between the type-A buried CoSi, layer and Si(111) both have eightfold coordinated Co atoms. This is accomplished by converting the one interface structure from sevenfold to eightfold coordination by locating a twinned layer of Si at the interface. The preference for this interface over the sevenfold type-A structure is in agreement with theoretical predictions. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM JULICH, INST SCHICHT & IONENTECHN, W-5170 JULICH 1, GERMANY. RP CHISHOLM, MF (reprint author), OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RI Mantl, Siegfried/L-1317-2013 OI Mantl, Siegfried/0000-0002-4266-0619 NR 18 TC 15 Z9 16 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 2 PY 1994 VL 64 IS 18 BP 2409 EP 2411 DI 10.1063/1.111583 PG 3 WC Physics, Applied SC Physics GA NK026 UT WOS:A1994NK02600028 ER PT J AU HILBERT, C GHOSHAL, U KROGER, H MARTENS, JS HIETALA, VM PLUT, TA AF HILBERT, C GHOSHAL, U KROGER, H MARTENS, JS HIETALA, VM PLUT, TA TI SUPERCONDUCTING READOUT OF SEMICONDUCTOR MEMORY AT LIQUID-NITROGEN TEMPERATURE SO APPLIED PHYSICS LETTERS LA English DT Article ID OPERATION; CMOS AB The discovery of high-temperature superconducting materials raises the possibility of operating semiconducting and superconducting circuits at the same temperature in intimately hybridized devices and circuits. We report the experimental readout of standard CMOS memory cells using high-temperature superconducting flux flow devices at 77 K. Significant reduction in access times below that achievable with cryogenic CMOS alone was measured; a 4.5-ns access time was achieved on a 1-mum CMOS static random access memory. These results obtained using nonoptimized, separate superconductor, and semiconductor chips demonstrate the potential of hybrid superconductor-semiconductor memories for speed and power improvements over pure semiconductors operated at cryogenic temperatures. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HILBERT, C (reprint author), MICROELECTR & COMP TECHNOL CORP,AUSTIN,TX 78727, USA. NR 14 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 2 PY 1994 VL 64 IS 18 BP 2442 EP 2444 DI 10.1063/1.111593 PG 3 WC Physics, Applied SC Physics GA NK026 UT WOS:A1994NK02600039 ER PT J AU HOFFMAN, DC AF HOFFMAN, DC TI THE HEAVIEST ELEMENTS SO CHEMICAL & ENGINEERING NEWS LA English DT Article ID CHEMISTRY; DISCOVERY C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. NR 12 TC 17 Z9 17 U1 0 U2 1 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 2 PY 1994 VL 72 IS 18 BP 24 EP 34 DI 10.1021/cen-v072n018.p024 PG 11 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA NJ142 UT WOS:A1994NJ14200017 ER PT J AU HENTZSCHEL, R FAUST, HR DENSCHLAG, HO WILKINS, BD GINDLER, J AF HENTZSCHEL, R FAUST, HR DENSCHLAG, HO WILKINS, BD GINDLER, J TI MASS, CHARGE AND ENERGY-DISTRIBUTIONS IN THE VERY ASYMMETRIC FISSION OF CF-249 INDUCED BY THERMAL-NEUTRONS SO NUCLEAR PHYSICS A LA English DT Article DE 249CF(NTH, F); E IS THERMAL; MEASURED FISSION PRODUCT YIELDS (A = 69-87) AT VARIOUS KINETIC ENERGIES OF THE FISSION FRAGMENTS; DEDUCED NUCLEAR CHARGE ENERGY AND KINETIC ENERGY DISTRIBUTIONS (ODD-EVEN FACTORS) ID PRODUCT KINETIC ENERGIES; YIELDS; FRAGMENTS; SCISSION; PU-239; U-235 AB Fission yields of fragments with mass numbers A = 69-87 and fragment kinetic energies for A = 74-87 in the very asymmetric neutron induced fission of Cf-249 have been measured using the mass separator Lohengrin at the Institut Laue-Langevin in Grenoble. The chain yields observed in this very light mass region are considerably higher than predicted. An evaluation of the isotopic yields shows a strong increase of the proton odd-even effect from 7% to 17% with increasingly asymmetric fission. The neutron odd-even effect is increasing from 4% to 10%. These observations and a narrowing of the average nuclear charge distribution can be explained by a decreasing excitation energy with increasing asymmetry of the fission process. C1 INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. ARGONNE NATL LAB,ARGONNE,IL 60439. RP HENTZSCHEL, R (reprint author), UNIV MAINZ,INST KERNCHEM,D-55099 MAINZ,GERMANY. NR 27 TC 36 Z9 37 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAY 2 PY 1994 VL 571 IS 3 BP 427 EP 446 DI 10.1016/0375-9474(94)90220-8 PG 20 WC Physics, Nuclear SC Physics GA NJ037 UT WOS:A1994NJ03700002 ER PT J AU MCGOWAN, FK MILNER, WT AF MCGOWAN, FK MILNER, WT TI COULOMB-EXCITATION OF STATES IN U-238 SO NUCLEAR PHYSICS A LA English DT Article DE U-238(ALPHA,ALPHA'GAMMA); E=18-MEV; MEASURED I-GAMMA, E-GAMMA, GAMMA(0) FOLLOWING COULOMB EXCITATION; U-238 LEVELS DEDUCED B (LAMBDA), J, PI, DELTA ID DEFORMED-NUCLEI; ACTINIDE NUCLEI; ANHARMONICITIES; MOMENTS; ER-168; MODEL AB Twenty-two states in U-238 have been observed with 18 MeV He-4 ions on a thick target. Eight 2 + states between 966 and 1782 keV and three 3- states are populated by direct E2 and E3, respectively. The remaining states are either weakly excited by multiple Coulomb excitation and/or populated by the y-ray decay of the directly excited states. Spin assignments are based on gamma-ray angular distributions. Reduced transition probabilities have been deduced from the gamma-ray yields. The B(E2) values for excitation of the 2+ states range from 0.10 to 3.0 W.u. (281 W.u. for the first 2+ state). For the 3 states, the B(E3, 0 --> 3-) values are 7.1, 7.8, and 24.2 W.u. Several of the 2+ states have decay branches to the one-phonon states with B(E2) values between 27 and 56 Wu. which are an order of magnitude larger than the B(E2) values between the one- and zero-phonon states. This disagrees with our present understanding of collectivity in nuclei if these 2+ states are considered to be collective two-phonon excitations. However, the excitation energies of these 2+ states with respect to the one-phonon states are only 1.3 to 1.6. The B(E1) values for 17 transitions between the positive- and negative-parity states range between 10(-3) and 10(-7) W.u. The B(E1) branching ratios for many of these transitions have large deviations from the Alga-rule predictions. These deviations can be understood by the strong Coriolis coupling between the states of the one-phonon octupole quadruplet in deformed nuclei. The general features of the experimental results for the B(E3) values are reproduced by the microscopic calculations of Neergard and Vogel when the Coriolis coupling between the states of the octupole quadruplet is included. RP MCGOWAN, FK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 27 TC 26 Z9 26 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 2 PY 1994 VL 571 IS 3 BP 569 EP 587 DI 10.1016/0375-9474(94)90226-7 PG 19 WC Physics, Nuclear SC Physics GA NJ037 UT WOS:A1994NJ03700008 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOUS, K BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DEFEZLASO, MDM DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GERDYUKOV, L GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOUS, K BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DEFEZLASO, MDM DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GERDYUKOV, L GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G ZUNIGA, J TI IMPROVED MEASUREMENTS OF CROSS-SECTIONS AND ASYMMETRIES AT THE Z(0) RESONANCE SO NUCLEAR PHYSICS B LA English DT Note ID LUND MONTE-CARLO; ELECTRON-POSITRON COLLISIONS; LOWEST-ORDER CALCULATIONS; LEP-SLC ENERGIES; BHABHA SCATTERING; RADIATIVE-CORRECTIONS; JET FRAGMENTATION; PROGRAM; PHYSICS AB During the 1992 running period of the LEP e+e- collider, the DELPHI experiment accumulated approximately 24 pb-1 of data at the Z0 peak. The decays into hadrons and charged leptons have been analysed to give values for the cross sections and leptonic forward-backward asymmetries which are significantly improved with respect to those previously published by the DELPHI collaboration. Incorporating these new data, more precise values for the Z0 resonance parameters are obtained from model-independent fits. The results are interpreted within the framework of the Standard Model, yielding for the top quark mass m(t) = 157(-48)+36(expt.)-20(+19)(Higgs) GeV, and for the effective mixing angle sin2 theta(eff)lept = 0.2328 +/- 0.0013 (expt.)-0.0003(+0.0001)(Higgs), where (Higgs) represents the variation due to Higgs boson mass in the range 60 to 1000 GeV, with central value 300 GeV. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VRIJE UNIV BRUSSELS,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,BOLOGNA,ITALY. COLL FRANCE,CNRS,IN2P3,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CZECHOSLOVAK ACAD SCI,DIV HIGH ENERGY PHYS,FZU,INST PHYS,CS-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 ST MARTIN DHERES,FRANCE. UNIV HELSINKI,SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,101000 MOSCOW,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,NC,CS-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA II,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,ROME,ITALY. CENS,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,IFIC,CSIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; de Paula, Leandro/I-9278-2012; Andreazza, Attilio/E-5642-2011; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; de Paula, Leandro/0000-0002-4984-7734; Andreazza, Attilio/0000-0001-5161-5759; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 24 TC 52 Z9 52 U1 0 U2 9 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 2 PY 1994 VL 418 IS 3 BP 403 EP 427 DI 10.1016/0550-3213(94)90524-X PG 25 WC Physics, Particles & Fields SC Physics GA NR907 UT WOS:A1994NR90700001 ER PT J AU ROSE, HA DUBOIS, DF AF ROSE, HA DUBOIS, DF TI LASER HOT-SPOTS AND THE BREAKDOWN OF LINEAR INSTABILITY THEORY WITH APPLICATION TO STIMULATED BRILLOUIN-SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID RAMAN-SCATTERING; PLASMA AB Convective instabilities in the strongly damped regime are shown to exhibit essential nonlinear behavior due to laser hot spots when the average laser intensity [I] approaches a critical threshold value I(c). The onset of this nonlinear regime is formally signaled by the divergence of the average convective amplification [A] as [I] --> I(c). An independent hot spot model of random phase plate optics predicts that [A] approximately 1/(I(c) - [I])2. A saturated hot spot model of nonlinear stimulated Brillouin scattering (SBS) predicts a rapid turn on and saturation of SBS reflectivity with laser intensity and optic f/number. RP ROSE, HA (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 7 TC 111 Z9 111 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 2 PY 1994 VL 72 IS 18 BP 2883 EP 2886 DI 10.1103/PhysRevLett.72.2883 PG 4 WC Physics, Multidisciplinary SC Physics GA NJ297 UT WOS:A1994NJ29700016 ER PT J AU LEVINTON, FM ZAKHAROV, L BATHA, SH MANICKAM, J ZARNSTORFF, MC AF LEVINTON, FM ZAKHAROV, L BATHA, SH MANICKAM, J ZARNSTORFF, MC TI STABILIZATION AND ONSET OF SAWTEETH IN TFTR SO PHYSICAL REVIEW LETTERS LA English DT Article ID FUSION TEST REACTOR; TOKAMAK; MODE; STABILITY; PLASMA AB Measurements from the Tokamak Fusion Test Reactor (TFTR) of the q profile using motional Stark effect polarimetry and the pressure profiles have allowed detailed comparison of both supershots and L-mode discharges to theoretical models describing the stability of sawteeth. In TFTR supershots sawteeth are usually absent, whereas in L-mode discharges they are generally present, and in both cases q(0) is less than 1. It has been found that the omega*-stabilization criterion of the two-fluid collisionless m = 1 reconnection mode agrees very well with the presence or absence of sawteeth in TFTR and no beta limits to the sawtooth stabilization have been observed. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP LEVINTON, FM (reprint author), FUS PHYS & TECHNOL,TORRANCE,CA 90503, USA. NR 27 TC 65 Z9 65 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 2 PY 1994 VL 72 IS 18 BP 2895 EP 2898 DI 10.1103/PhysRevLett.72.2895 PG 4 WC Physics, Multidisciplinary SC Physics GA NJ297 UT WOS:A1994NJ29700019 ER PT J AU STEINER, MM ALBERS, RC SHAM, LJ AF STEINER, MM ALBERS, RC SHAM, LJ TI 1ST-PRINCIPLES CALCULATIONS OF THE SPECIFIC-HEAT MASS ENHANCEMENTS IN UIR3, UPT3, AND UAU3 SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; SUPERCONDUCTOR UPT3; FERMI-SURFACE AB By including dynamic fluctuations around the local-density-approximation (LDA) electronic structure we find good agreement for the specific-heat mass-enhancement factors for UX3 (X = lr, Pt, Au). The fluctuations, which are calculated through to second order in the perturbation, are restricted to those caused by strong, local, uranium 5f electron-electron interactions, for which the calculated effective interaction strength is 2 eV. The strong material dependence of the second-order mass-enhancement factors is related to the composition dependence of the Fermi energy and the underlying one-electron LDA density of states. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RP STEINER, MM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Sham, Lu/0000-0001-5718-2077 NR 29 TC 39 Z9 39 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 2 PY 1994 VL 72 IS 18 BP 2923 EP 2926 DI 10.1103/PhysRevLett.72.2923 PG 4 WC Physics, Multidisciplinary SC Physics GA NJ297 UT WOS:A1994NJ29700026 ER PT J AU BRIZARD, A AF BRIZARD, A TI ON THE RELATION BETWEEN PSEUDO-HERMITICITY AND DISSIPATION SO PHYSICS LETTERS A LA English DT Article ID BRACKET FORMULATION; EQUATIONS; SYSTEMS; PLASMA AB Pseudo-Hermiticity has recently been shown to be a general property of linearized Hamiltonian (dissipationless) operators. Here, we show how the anti-pseudo-Hermitian part of a general linear evolution operator is related to dissipation by considering two examples from plasma physics: the linearized Boltzmann-Coulomb equation, with a dissipationless self-consistent electrostatic interaction term and a dissipative Krook collision term, and linearized viscous magnetohydrodynamics, with dissipationless gyroviscosity and dissipative parallel viscosity. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. OI Brizard, Alain/0000-0002-0192-6273 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 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAY 2 PY 1994 VL 187 IS 5-6 BP 382 EP 390 DI 10.1016/0375-9601(94)91112-6 PG 9 WC Physics, Multidisciplinary SC Physics GA NJ143 UT WOS:A1994NJ14300006 ER PT J AU FOSTER, I TAYLOR, S AF FOSTER, I TAYLOR, S TI A COMPILER APPROACH TO SCALABLE CONCURRENT-PROGRAM DESIGN SO ACM TRANSACTIONS ON PROGRAMMING LANGUAGES AND SYSTEMS LA English DT Article DE DESIGN; LANGUAGES; MONOTONICITY; PROGRAM COMPOSITION; PROGRAMMING ABSTRACTIONS; SOURCE-TO-SOURCE TRANSFORMATIONS AB We describe a compilation system for the concurrent programming language Program Composition Notation (PCN). This notation provides a single-assignment programming model that permits concurrent-programming concerns such as decomposition, communication, synchronization, mapping, granularity, and load balancing to be addressed separately in a design. PCN is also extensible with programmer-defined operators, allowing common abstractions to be encapsulated and reused in different contexts. The compilation system incorporates a concurrent-transformation system that allows abstractions to be defined through concurrent source-to-source transformations; these convert programmer-defined operators into a core notation. Run-time system techniques allow the core notation to be compiled into a simple concurrent abstract machine which can be implemented in a portable fashion using a run-time library. The abstract machine provides a uniform treatment of single-assignment and mutable data structures, allowing data sharing between concurrent and sequential program segments and permitting integration of sequential C and Fortran code into concurrent programs. This compilation system forms part of a program development toolkit that operates on a wide variety of networked workstations, multicomputers, and shared-memory multiprocessors. The toolkit has been used both to develop substantial applications and to teach introductory concurrent-programming classes, including a freshman course at Caltech. C1 CALTECH,PASADENA,CA 91125. RP FOSTER, I (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 44 TC 5 Z9 5 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0164-0925 J9 ACM T PROGR LANG SYS JI ACM Trans. Program. Lang. Syst. PD MAY PY 1994 VL 16 IS 3 BP 577 EP 604 DI 10.1145/177492.177612 PG 28 WC Computer Science, Software Engineering SC Computer Science GA NZ579 UT WOS:A1994NZ57900009 ER PT J AU KIM, R HOLBROOK, EL JANCARIK, J PANDIT, J WENG, XW BOHM, A KIM, SH AF KIM, R HOLBROOK, EL JANCARIK, J PANDIT, J WENG, XW BOHM, A KIM, SH TI HIGH-RESOLUTION CRYSTALS AND PRELIMINARY-X-RAY DIFFRACTION STUDIES OF A CATALYTIC RNA SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID SELF-CLEAVAGE; PLUS AB High-resolution single crystals of a catalytic RNA molecule derived from the sequence of the satellite RNA of tobacco ringspot virus have been obtained. The unit-cell volumes of the RNA crystals vary depending on the crystallization conditions and temperature. The best crystal form, when flash frozen, has space group P1 with unit-cell dimensions a = 53.08, b = 71.81, c = 28.03 angstrom, alpha = 98.43, beta = 104.32 and gamma = 74.540. This form diffracts to a resolution of 2.4 angstrom. A heavy-atom derivative search is in progress. C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. NR 10 TC 16 Z9 16 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0907-4449 J9 ACTA CRYSTALLOGR D JI Acta Crystallogr. Sect. D-Biol. Crystallogr. PD MAY 1 PY 1994 VL 50 BP 290 EP 292 DI 10.1107/S0907444993013071 PN 3 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA NM609 UT WOS:A1994NM60900008 PM 15299441 ER PT J AU JAYARAM, R MILLER, MK AF JAYARAM, R MILLER, MK TI AN ATOM-PROBE STUDY OF GRAIN-BOUNDARY AND MATRIX CHEMISTRY IN MICROALLOYED NIAL SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID SUBSTITUTIONAL SOLUTES; BORON; NI3AL; TEMPERATURE; DUCTILITY; BERYLLIUM; COMPOUND; STRENGTH; ALCO AB The atom probe field ion microscope (APFIM) has been used to perform a quantitative study of the grain boundary and matrix chemistry in NiAl microalloyed with either boron, carbon or beryllium. Boron was observed to segregate to grain boundaries whereas carbon and beryllium did not. Atom probe measurements of the matrix chemistry revealed severe depletion of the solute in the boron- and carbon-doped alloys. Field ion imaging, atom probe analyses and transmission electron microscopy (TEM) of the matrix revealed ultrafine MB2- and MC-type precipitates ranging in size between 2 and 20 nm in diameter in the boron- and carbon-doped NiAl. The number densities of these precipitates were estimated by atom probe analyses to range between 1 x 10(20) m-3 and 1 x 10(23) m-3 for precipitates of 20 and 2 nm diameter, respectively. Atom probe analyses of the matrix in beryllium-doped NiAl revealed that almost all the beryllium was in solid solution. This was consistent with the fact that ultrafine beryllide precipitates were not detected in the atom probe. The enormous increase in yield stress in the boron- and carbon-doped alloys is predominantly due to a precipitation hardening effect. The relatively small increase in yield stress in beryllium-doped NiAl is due to a weak substitutional solid solution hardening effect. RP JAYARAM, R (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. NR 39 TC 31 Z9 31 U1 0 U2 4 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 1994 VL 42 IS 5 BP 1561 EP 1572 DI 10.1016/0956-7151(94)90366-2 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NC237 UT WOS:A1994NC23700007 ER PT J AU HILDEMANN, LM MAZUREK, MA CASS, GR SIMONEIT, BRT AF HILDEMANN, LM MAZUREK, MA CASS, GR SIMONEIT, BRT TI SEASONAL TRENDS IN LOS-ANGELES AMBIENT ORGANIC AEROSOL OBSERVED BY HIGH-RESOLUTION GAS-CHROMATOGRAPHY SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; CARBON PARTICLE CONCENTRATIONS; CHEMICAL CHARACTERISTICS; UNITED-STATES; MATTER; SIZE; AIR; MUTAGENICITY; TROPOSPHERE; EMISSIONS AB Ambient samples of fine organic aerosol collected from four locations in the Los Angeles Basin over a 1-year period have been characterized quantitatively via high-resolution gas chromatography. Bulk chemical characteristics, such as the mass of acidic versus neutral organic material, have been determined for these samples. The seasonal variations of these bulk characteristics are examined over a year-long time period. Due to weather patterns typical of the Los Angeles ares, the ambient concentration levels in the western Los Angeles Basin exhibit a strong peak during the fall/winter period that is driven by changes in the concentration of higher molecular weight neutral organic compounds; such compounds are characteristic of motor vehicle exhaust, tire dust, road dust, and vegetative detritus. When meteorological effects are excluded, this seasonal variation in the higher molecular weight neutral organic fraction collected from all four sites is removed completely. Correction for the effect of seasonal changes in atmospheric dilution reveals an increase in source emissions and/or atmospheric production of lower molecular weight acidic and neutral organic aerosols between April and July. Secondary organic aerosol formation, which produces polar organic reaction products appearing in the. acidic fraction, plus increased emissions from biological activity at that time of year may account for the observed increase in lower molecular weight organic aerosol inputs during the April-July period. C1 BROOKHAVEN NATL LAB,DIV ENVIRONM CHEM,UPTON,NY 11973. CALTECH,DEPT ENVIRONM ENGN SCI,PASADENA,CA 91125. CALTECH,ENVIRONM QUAL LAB,PASADENA,CA 91125. OREGON STATE UNIV,COLL OCEAN & ATMOSPHER SCI,CORVALLIS,OR 97331. RP HILDEMANN, LM (reprint author), STANFORD UNIV,DEPT CIVIL ENGN,STANFORD,CA 94305, USA. RI SIMONEIT, BERND/A-2008-2013 NR 44 TC 29 Z9 30 U1 1 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD MAY PY 1994 VL 20 IS 4 BP 303 EP 317 DI 10.1080/02786829408959687 PG 15 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NH798 UT WOS:A1994NH79800002 ER PT J AU YOST, MG GADGIL, AJ DRESCHER, AC ZHOU, Y SIMONDS, MA LEVINE, SP NAZAROFF, WW SAISAN, PA AF YOST, MG GADGIL, AJ DRESCHER, AC ZHOU, Y SIMONDS, MA LEVINE, SP NAZAROFF, WW SAISAN, PA TI IMAGING INDOOR TRACER-GAS CONCENTRATIONS WITH COMPUTED-TOMOGRAPHY - EXPERIMENTAL RESULTS WITH A REMOTE-SENSING FTIR SYSTEM SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article ID OPTICAL TOMOGRAPHY; FLOWS; FLAME AB This work demonstrates for the first time the feasibility of computed tomography (CT) reconstructions of pollutant concentrations in a real room setting. A remote sensing Fourier transform infrared spectrometer was mounted on a moving base in a controlled ventilation chamber. A passive tracer was released from a point source into the room under constant ventilation conditions. A series of experiments gathered multiple path-averaged measurements in a two-dimensional plane for CT reconstruction. Simultaneous readings were gathered with a multiple-point sampling array for later comparison to the CT reconstructed concentrations. Good qualitative agreement between the reconstruction and point sample data was obtained. Limitations encountered due to the temporal resolution, size, and geometry of the experimental apparatus are clearly surmountable with better instrumentation. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SCH PUBL HLTH,BERKELEY,CA 94720. UNIV MICHIGAN,SCH PUBL HLTH,ANN ARBOR,MI 48109. UNIV CALIF BERKELEY,DEPT CIVIL ENGN,BERKELEY,CA 94720. RP YOST, MG (reprint author), UNIV WASHINGTON,SCH PUBL HLTH & COMMUNITY MED,DEPT ENVIRONM HLTH,SC-34,SEATTLE,WA 98195, USA. RI Nazaroff, William/C-4106-2008; OI Nazaroff, William/0000-0001-5645-3357; Gadgil, Ashok/0000-0002-0357-9455 FU NIOSH CDC HHS [R01-OH-02666] NR 27 TC 43 Z9 45 U1 0 U2 1 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD MAY PY 1994 VL 55 IS 5 BP 395 EP 402 DI 10.1202/0002-8894(1994)055<0395:IITCWC>2.0.CO;2 PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA NJ102 UT WOS:A1994NJ10200003 PM 8209844 ER EF